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WO2024031348A1 - 电极组件、电池单体、电池及用电设备 - Google Patents

电极组件、电池单体、电池及用电设备 Download PDF

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Publication number
WO2024031348A1
WO2024031348A1 PCT/CN2022/111214 CN2022111214W WO2024031348A1 WO 2024031348 A1 WO2024031348 A1 WO 2024031348A1 CN 2022111214 W CN2022111214 W CN 2022111214W WO 2024031348 A1 WO2024031348 A1 WO 2024031348A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
active layer
along
electrode active
negative
Prior art date
Application number
PCT/CN2022/111214
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English (en)
French (fr)
Inventor
阎晓洁
刘智
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to CN202280091275.3A priority Critical patent/CN118661310A/zh
Priority to PCT/CN2022/111214 priority patent/WO2024031348A1/zh
Publication of WO2024031348A1 publication Critical patent/WO2024031348A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators

Definitions

  • the present application relates to the field of battery technology, specifically, to an electrode assembly, a battery cell, a battery and electrical equipment.
  • lithium-ion batteries As a rechargeable battery, lithium-ion batteries have the advantages of small size, high power density, many cycles and long storage time. Among them, the energy density of the battery is an important factor affecting battery performance. Therefore, how to improve the energy density of the battery has become an urgent problem in the field of battery technology.
  • Embodiments of the present application provide an electrode assembly, a battery cell, a battery and electrical equipment to improve the energy density of the battery.
  • inventions of the present application provide an electrode assembly, including a first pole piece group.
  • the first pole piece group includes a plurality of first pole pieces stacked along a first direction.
  • the first pole piece includes A first current collector, a first positive electrode active layer and a first negative electrode active layer, the first positive electrode active layer and the first negative electrode active layer are respectively disposed on both sides of the first current collector along the first direction.
  • the first negative active layer of one of the two adjacent first pole pieces faces and covers the first positive active layer of the other; at least one of the continuously arranged first pole pieces in the first pole piece group A portion of the first pole piece forms a first pole piece region, and the length of the first positive electrode active layer of the first pole piece in the first pole piece region gradually increases along the first direction.
  • the length of the first cathode active layer of the first pole piece in the first pole piece region gradually increases along the first direction, so that the length of the first cathode active layer of the first pole piece region can adapt to the special shape of the internal space.
  • the casing allows the special-shaped internal space of the casing to be fully utilized, which is beneficial to improving the energy density of the battery cells and batteries equipped with the electrode assembly.
  • the first negative active layer of one of the two adjacent first pole pieces faces and covers the first positive active layer of the other, which can reduce the risk of lithium deposition and improve the performance of battery cells and batteries equipped with the electrode assembly. safety performance.
  • the first pole piece makes full use of the special-shaped space inside the casing, the first pole piece is not easy to shake after the battery vibrates, so that the adjacent first pole pieces can maintain a stable stacking relationship, further reducing the There is a risk of lithium precipitation in the electrode assembly due to the shaking of the first pole piece causing adjacent first pole pieces to be dislocated in a direction perpendicular to the first direction.
  • the length of the first negative active layer of the first pole piece in the first pole piece region gradually increases along the first direction.
  • the length of the first negative active layer of the first pole piece in the first pole piece region gradually increases along the first direction, then in the first pole piece region, the length of the first negative electrode active layer of the first pole piece is
  • the changing trend of the length along the first direction is the same as the changing trend of the length of the first positive active layer along the first direction, so that the changing trend of the length of the first negative active layer of each first pole piece in the first pole piece region adapts to the first
  • the changing trend of the length of the positive active layer enables the length of the first negative active layer in the first electrode area to adapt to the special-shaped internal space of the shell, so that the special-shaped internal space of the shell can be fully utilized, thereby conducive to improving the performance of the first negative active layer.
  • the energy density of the battery cell and battery of the electrode assembly is the same as the changing trend of the length of the first positive active layer along the first direction, so that the changing trend of the length of the first negative active layer of each first pole piece in the first pole piece region adapts to the first
  • the edge of the first negative active layer exceeds the edge of the first positive active layer; or, the edge of the first negative active layer is in contact with the first positive active layer.
  • the edges of the layer are flush.
  • the edge of the first negative active layer exceeds the edge of the first positive active layer or the edge of the first negative active layer is flush with the edge of the first positive active layer, which can Reduce the risk of lithium precipitation and improve the safety performance of battery cells and batteries equipped with this electrode assembly.
  • both ends of one of the two adjacent first positive electrode active layers along the length direction of the first pole piece are Exceeding both ends of the other; and/or, both ends of one of the two adjacent first negative active layers along the length direction of the first pole piece exceed both ends of the other;
  • the length direction of the first pole piece is perpendicular to the first direction.
  • both ends of one of the two adjacent first positive electrode active layers in the length direction of the first pole piece exceed both ends of the other, and/or, the two adjacent first positive electrode active layers
  • Both ends of one of the negative electrode active layers along the length direction of the first electrode piece exceed both ends of the other, so that the first positive electrode active layer and/or the first negative electrode active layer in the first electrode piece region can adapt to the internal space.
  • the case with special shapes at both ends along the length direction of the first pole piece allows the special-shaped internal space of the case to be fully utilized, which is beneficial to improving the energy density of the battery cells and batteries equipped with the electrode assembly.
  • one end of one of the two adjacent first positive electrode active layers along the length direction of the first pole piece is connected to the other end of the adjacent first cathode active layer.
  • One end along the length direction of the first pole piece is flush; and/or one end of one of the two adjacent first negative active layers along the length direction of the first pole piece is flush with the other end.
  • One end along the length direction of the first pole piece is flush; the length direction of the first pole piece is perpendicular to the first direction.
  • one end of one of the two adjacent first positive electrode active layers along the length direction of the first pole piece is flush with one end of the other one along the length direction of the first pole piece, and/or they are opposite to each other.
  • One end of one of the two adjacent first negative electrode active layers along the length direction of the first pole piece is flush with the end of the other one along the length direction of the first pole piece, so that the first positive electrode active layer in the first pole piece region
  • the first negative electrode active layer can adapt to a case whose internal space is irregularly shaped at one end and regular at the other end along the length direction of the first pole piece, so that the internal space of the case can be fully utilized, thus conducive to improving the performance of the electrode assembly.
  • At least a portion of the continuously arranged first pole pieces in the first pole piece group forms the first pole piece region, and another portion of the first pole piece group
  • the first pole piece forms a second pole piece region.
  • the first pole pieces with the largest and smallest lengths of the first positive active layer are respectively the first pole piece unit and the second pole piece.
  • Pole piece unit; the second pole piece area is disposed on one side of the first pole piece area, and the second pole piece area is disposed on a side of the first pole piece unit facing away from the second pole piece unit,
  • the first pole piece in the second pole piece area is the same as the first pole piece unit.
  • the first pole piece in the second pole piece area is the same as the first pole piece with the longest length of the first positive electrode active layer in the first pole piece area, so that the electrode assembly can adapt to the internal space that is partially regular and the other.
  • a part of the special-shaped casing allows the internal space of the casing to be fully utilized, which is beneficial to improving the energy density of the battery cells and batteries equipped with the electrode assembly.
  • the second pole piece unit is located at one end of the electrode assembly along a second direction, and the first direction is opposite to the second direction.
  • the length of the first positive active layer of the second pole piece unit is the smallest and the second pole piece unit is located at one end of the electrode assembly along the second direction, so that the first pole of the first pole piece region
  • the sheet can adapt to the special-shaped casing in the internal space, so that the special-shaped internal space of the casing can be fully utilized, which is beneficial to improving the energy density of the battery cells and batteries equipped with the electrode assembly.
  • the electrode assembly further includes a second pole piece, and the second pole piece is disposed on one side of the first pole piece group along the first direction, and It is arranged adjacent to the one with the longest length of the first positive active layer in the first pole piece group; including a second current collector and a second negative active layer along the second pole piece, in the first direction , the second current collector is provided with the second negative electrode active layer on at least one side facing the first pole piece, and the second negative electrode is provided on the side of the second current collector facing the first pole piece.
  • the active layer is arranged opposite to the first positive active layer of the adjacent first pole piece and covers the first positive active layer.
  • a second pole piece is provided, and the second negative electrode active layer on the side of the second pole piece facing the first pole piece is opposite to the first positive electrode active layer of the adjacent first pole piece and covers the first positive electrode.
  • the active layer is such that the first positive active layer of each first pole piece in the first pole piece group has a corresponding negative electrode active layer, so that the first positive electrode active layer of each first pole piece in the first pole piece group is The ions detached from the first positive electrode active layer can be taken over by the negative electrode active layer, which can increase the energy density of battery cells and batteries equipped with the electrode assembly, and can also reduce the risk of lithium precipitation.
  • the second negative active layer is provided on both sides of the second current collector along the first direction.
  • the second negative electrode active layer is provided on both sides of the second current collector along the first direction, and the positive electrode active layer can be correspondingly provided on both sides of the second pole piece along the first direction, which is beneficial to improving the efficiency of the current collector.
  • the energy density of the battery cell and battery of the electrode assembly is beneficial to improving the efficiency of the current collector.
  • the electrode assembly further includes a second pole piece group, and along the first direction, the second pole piece group is disposed where the second pole piece is away from the third pole piece.
  • the second pole piece group includes at least one third pole piece
  • the third pole piece includes a third current collector, a third positive electrode active layer and a third negative electrode active layer, in the In the first direction, the third positive active layer is disposed on a side of the third current collector facing the second pole piece, and the third negative active layer is disposed on a side of the third current collector facing away from the second pole piece.
  • the arrangement of the second pole piece group can improve the energy density of the battery cells and batteries equipped with the electrode assembly.
  • the edge of the third negative active layer exceeds the edge of the third positive active layer; or, the edge of the third negative active layer is in contact with the third positive active layer.
  • the edges of the layer are flush.
  • the edge of the third negative active layer exceeds the edge of the third positive active layer or the edge of the third negative active layer is flush with the edge of the third positive active layer, which can Reduce the risk of lithium precipitation and improve the safety performance of battery cells and batteries equipped with this electrode assembly.
  • the second pole piece group includes a plurality of third pole pieces, and the plurality of third pole pieces are arranged along a second direction, and the second direction is consistent with The first direction is opposite.
  • the second pole piece group includes a plurality of third pole pieces, so that the battery cells and batteries equipped with the electrode assembly can have higher energy density.
  • the first pole piece group and the second pole piece group are arranged symmetrically with respect to the second pole piece.
  • the first pole piece group and the second pole piece group are arranged symmetrically with respect to the second pole piece, so that the length of the third positive active layer of the second pole piece group can adapt to the special-shaped housing in the internal space, and the electrode
  • the component can adapt to the special-shaped housing on both sides of the internal space along the first direction, so that the special-shaped internal space of the housing can be fully utilized, which is beneficial to improving the energy density of the battery cells and batteries equipped with the electrode assembly.
  • the second negative electrode active layer is along both ends of the third electrode piece in the length direction and the third negative electrode active layer is along the length direction of the third electrode piece. Both ends of the third pole piece are flush, and the length direction of the third pole piece is perpendicular to the first direction.
  • both ends of the second negative active layer along the length direction of the third pole piece are flush with both ends of the third negative active layer along the length direction of the third pole piece, so that the length of the third negative active layer is sufficient. It is large, can reduce the risk of lithium precipitation, and improve the safety performance of battery cells and batteries equipped with this electrode assembly.
  • embodiments of the present application provide a battery cell, including the electrode assembly provided in the first aspect.
  • the electrode assembly provided in the embodiment of the first aspect can adapt to a special-shaped space and has a low risk of lithium precipitation.
  • Accommodating the electrode assembly in a shell with a special-shaped space inside can make full use of the special-shaped interior of the shell. space, thereby helping to improve the energy density and safety performance of battery cells equipped with the electrode assembly.
  • an embodiment of the present application provides a battery, including a box and the battery cell provided in the embodiment of the second aspect; the battery cell is accommodated in the box.
  • the battery cell provided by the embodiment of the second aspect has higher energy density and lower risk of lithium precipitation.
  • the battery including the battery cell provided by the embodiment of the second aspect has better energy sealing and safety performance.
  • an embodiment of the present application provides an electrical device, including the battery provided in an embodiment of the third aspect.
  • Figure 1 is a schematic structural diagram of a special-shaped battery in the prior art
  • Figure 2 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • FIG. 3 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • Figure 4 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • Figure 5 is an exploded view of a battery cell provided by some embodiments of the present application.
  • Figure 6 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • Figure 7 is a schematic structural diagram of the first pole piece provided by some embodiments of the present application.
  • Figure 8 is a schematic structural diagram of the first pole piece provided by other embodiments of the present application.
  • Figure 9 is a schematic structural diagram of a battery cell provided by other embodiments of the present application.
  • Figure 10 is a schematic structural diagram of a battery cell provided in some embodiments of the present application.
  • Figure 11 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • Figure 12 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • FIG. 13 is a schematic structural diagram of a battery unit provided by still other embodiments of the present application.
  • FIG 14 is a schematic structural diagram of a battery cell provided by still other embodiments of the present application (the second pole piece has a second negative electrode active layer on both sides);
  • Figure 15 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • Figure 16 is a schematic structural diagram of a battery cell including the electrode assembly in Figure 15 provided by an embodiment of the present application;
  • Figure 17 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • Figure 18 is a schematic structural diagram of a battery cell including the electrode assembly in Figure 16 provided by an embodiment of the present application;
  • Figure 19 is a schematic structural diagram of an electrode assembly provided by other embodiments of the present application.
  • Figure 20 is a schematic structural diagram of a battery cell including the electrode assembly in Figure 19 provided by an embodiment of the present application;
  • Figure 21 is a schematic structural diagram of a battery cell provided by other embodiments of the present application.
  • Figure 22 is a schematic structural diagram of a third pole piece provided by some embodiments of the present application.
  • Figure 23 is a schematic structural diagram of a fourth pole piece provided by other embodiments of the present application.
  • Figure 24 is a schematic structural diagram of a battery cell provided by still other embodiments of the present application.
  • Figure 25 is a schematic structural diagram of a battery cell provided by some further embodiments of the present application.
  • Figure 26 is a schematic structural diagram of a battery cell provided by yet other embodiments of the present application.
  • FIG. 27 is a schematic structural diagram of a battery cell provided in some further embodiments of the present application.
  • Icon 1000-vehicle; 100-battery; 10-box; 11-first part; 12-second part; 20', 20-battery cell; 21', 21-casing; 211-opening; 212-section One wall; 213-second wall; 214-third wall; 215-fourth wall; 216-first transition wall; 217-second transition wall; 218-arc wall; 22', 22-electrode assembly; 2 -positive electrode sheet; 2a-positive electrode current collector; 2b-positive electrode active layer; 3-negative electrode sheet; 3a-negative electrode current collector; 3b-negative electrode active layer; 221-first electrode plate group; 221a-first electrode plate area; 221b- Second pole piece area; 2211-first pole piece; 2211a-first pole piece unit; 2211b-second pole piece unit; 22111-first current collector; 22112-first positive electrode active layer; 22113-first negative electrode active layer ; 2212-first end pole piece; 22121-first end current collector; 22122-first end positive active layer;
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is commonly placed when used, or the orientation or positional relationship of this application.
  • the orientation or positional relationship commonly understood by those skilled in the art is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
  • the terms “first”, “second”, “third”, etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells.
  • the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which are not limited in the embodiments of this application.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, rectangular battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.
  • the battery cell 20' includes a case 21', an electrode assembly 22' and an electrolyte.
  • the electrolyte and the electrode assembly 22' are both accommodated in the case 21'.
  • the electrode assembly 22' is composed of a positive electrode sheet 2, a negative electrode sheet 3 and a separator 4.
  • the battery cell 20' mainly relies on the movement of metal ions between the positive electrode sheet 2 and the negative electrode sheet 3 to work.
  • the positive electrode sheet 2 includes a positive electrode current collector 2a and a positive electrode active layer 2b.
  • the positive electrode active layer 2b is coated on the surface of the positive electrode current collector 2a.
  • the positive electrode current collector 2a that is not coated with the positive electrode active layer 2b protrudes from the coated positive electrode active layer 2b.
  • the positive electrode current collector 2a which is not coated with the positive electrode active layer 2b, serves as the positive electrode tab.
  • the material of the positive electrode current collector 2a can be aluminum, and the positive electrode active layer 2b can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet 3 includes a negative electrode current collector 3a and a negative electrode active layer 3b.
  • the negative electrode active layer 3b is coated on the surface of the negative electrode current collector 3a.
  • the negative electrode current collector 3a that is not coated with the negative electrode active layer 3b protrudes from the coated negative electrode active layer 3b.
  • the negative electrode current collector 3a which is not coated with the negative electrode active layer 3b, serves as the negative electrode tab.
  • the negative electrode current collector 3a may be made of copper, and the negative electrode active layer 3b may be made of carbon or silicon.
  • the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.
  • the material of the isolation film can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • the electrode assembly 22' includes a wound electrode assembly and a laminated electrode assembly. Among them, the laminated electrode assembly is formed by alternately stacking positive electrode sheets 2, negative electrode sheets 3 and isolation films 4 along the first direction X1.
  • the existing positive electrode sheet includes a positive electrode current collector and a positive electrode active layer coated on both surfaces of the positive electrode current collector in the thickness direction
  • the negative electrode sheet includes a negative electrode current collector and both surfaces coated on the thickness direction of the negative electrode current collector. negative active layer.
  • the lengths of the positive and negative electrode plates need to be changed.
  • the casing The special-shaped area in the internal space of 21' includes the corner area A' of the casing 21'.
  • the length of the corresponding pole piece is also gradually reduced in the direction away from the middle part of the housing 21', so as to avoid the corner interference between the pole piece and the housing 21' to damage the pole piece, as shown in Figure 1.
  • the length of the negative electrode sheet 3 on the side of the positive electrode sheet 2 away from the middle part of the case 21' should be smaller than the positive electrode sheet 2, but this will lead to the problem of lithium deposition.
  • the inventor designed an electrode assembly after in-depth research.
  • the electrode assembly includes a first pole piece group, and the first pole piece group includes stacked electrodes arranged along a first direction.
  • the first pole piece includes a first current collector, a first positive electrode active layer and a first negative electrode active layer.
  • the first positive electrode active layer 22112 and the first negative electrode active layer are respectively disposed along the first current collector.
  • the first negative active layer of one of the two adjacent first pole pieces faces and covers the first positive active layer of the other; at least a portion of the continuously arranged first pole pieces in the first pole piece group
  • the pole piece forms a first pole piece region, and the length of the first positive electrode active layer of the first pole piece in the first pole piece region gradually increases along the first direction.
  • the length of the first positive active layer of the first pole piece in the first pole piece region gradually increases along the first direction, so that the length of the first positive electrode active layer in the first pole piece region can adapt to the special-shaped housing in the internal space, so that The special-shaped internal space of the casing can be fully utilized, which is beneficial to improving the energy density of the battery cells and batteries equipped with the electrode assembly.
  • the first negative active layer of one of the two adjacent first pole pieces faces and covers the first positive active layer of the other, which can reduce the risk of lithium deposition and improve the performance of battery cells and batteries equipped with the electrode assembly. safety performance.
  • the first pole piece makes full use of the special-shaped shell inside the casing, the first pole piece is not easy to shake after the battery vibrates, so that the adjacent first pole pieces can maintain a stable stacking relationship, further reducing the risk of This eliminates the risk of lithium precipitation in the electrode assembly due to the shaking of the first pole piece causing adjacent first pole pieces to be dislocated in a direction perpendicular to the first direction.
  • the battery cells disclosed in the embodiments of the present application and provided with the electrode assemblies provided by the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircrafts. Battery cells equipped with the electrode assemblies disclosed in the present application can also be used. Batteries and other components form the power supply system of the electrical equipment, which is beneficial to improving the energy density of battery cells and batteries.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.
  • an electrical device is a vehicle 1000 as an example.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle.
  • the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc.
  • the battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 .
  • the battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 .
  • the vehicle 1000 may also include a controller 200 and a motor 300 .
  • the controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .
  • the battery 100 includes a case 10 and a battery cell 20 .
  • the battery cell 20 is accommodated in the case 10 .
  • the box 10 is used to provide an accommodation space for the battery cells 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first part 11 and a second part 12 , the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a space for accommodating the battery cells 20 of accommodation space.
  • the second part 12 may be a hollow structure with one end open to form a receiving cavity for accommodating the battery cell 20 .
  • the first part 11 may be a plate-like structure.
  • the first part 11 is covered with the open side of the second part 12 so that the first part 11 Together with the second part 12, an accommodation space is defined; the first part 11 and the second part 12 may also be a hollow structure with one side open to form an accommodation cavity for accommodating the battery cell 20, and the open side of the first part 11 is closed. on the open side of the second part 12.
  • the box 10 formed by the first part 11 and the second part 12 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • the battery 100 there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that the plurality of battery cells 20 are connected in series and in parallel.
  • the plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the battery 100 can also be a plurality of battery cells 20 First, the battery modules are connected in series, parallel, or mixed to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 .
  • the battery 100 may also include other structures.
  • the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells 20 .
  • the battery 100 may further include a bus component (not shown), through which the multiple battery cells 20 may be electrically connected to achieve series, parallel, or mixed connection of the multiple battery cells 20 .
  • a bus component (not shown), through which the multiple battery cells 20 may be electrically connected to achieve series, parallel, or mixed connection of the multiple battery cells 20 .
  • Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.
  • the battery cells 20 may be flat, rectangular, or other shapes.
  • the battery cell 20 may include a case 21 , an electrode assembly 22 and an end cap 23 .
  • the housing 21 has an opening 211
  • the electrode assembly 22 is accommodated in the housing 21
  • the end cap 23 is used to cover the opening 211 .
  • the housing 21 can be in various shapes, such as elliptical structure, trapezoidal structure, hexagonal prism, etc.
  • the contour of the electrode assembly 22 can be adapted to the structural shape of the housing 21 .
  • the electrode assembly 22 can have a trapezoidal structure; if the housing 21 has an oval shape, the outline of the electrode assembly 22 can adapt to the outline of the housing 21 .
  • the housing 21 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which are not particularly limited in the embodiment of the present application.
  • the end cap 23 refers to a component that covers the opening 211 of the housing 21 to isolate the internal environment of the battery cell 20 from the external environment.
  • the shape of the end cap 23 can be adapted to the shape of the housing 21 to fit the housing 21 .
  • the end cap 23 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 23 is less likely to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher durability. Structural strength and safety performance can also be improved.
  • the end cap 23 is used to cover the opening 211 of the housing 21 to form a sealed installation space (not shown), and the installation space is used to accommodate the electrode assembly 22 .
  • the installation space is also used to accommodate electrolytes, such as electrolytes.
  • the end cap 23 is also provided with an electrode terminal 24 for outputting the electric energy of the electrode assembly 22.
  • the electrode terminal 24 is used for electrical connection with the electrode assembly 22, that is, the electrode terminal 24 is electrically connected to the tab (not shown in the figure) of the electrode assembly 22. , for example, the electrode terminal 24 and the tab are connected through a current collecting member (not shown in the figure) to realize the electrical connection between the electrode terminal 24 and the tab.
  • the opening 211 of the housing 21 may be one or two. If the opening 211 of the housing 21 is one, the end cover 23 can also be one, and two electrode terminals 24 can be provided in the end cover 23.
  • the two electrode terminals 24 are respectively the positive electrode terminal 24a and the negative electrode terminal 24b.
  • the positive electrode The terminal 24a and the negative electrode terminal 24b are respectively used to electrically connect the positive electrode lug 223 and the negative electrode lug 224 of the electrode assembly 22.
  • the two electrode terminals 24 in the end cap 23 are the positive electrode terminal 24a and the negative electrode terminal 24b respectively.
  • the electrode terminal 24 in one end cover 23 may be a positive electrode terminal 24a for electrical connection with the positive electrode lug 223 of the electrode assembly 22; the electrode terminal 24 in the other end cover 23 may be a negative electrode terminal. 24b, used for electrical connection with the negative electrode ear 224 of the electrode assembly 22.
  • the end cap 23 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the housing 21 and the end cover 23 may be independent components, and an opening 211 may be provided on the housing 21.
  • the end cover 23 covers the opening 211 at the opening 211 to form the internal environment of the battery cell 20.
  • the end cover 23 and the housing 21 can also be integrated.
  • the end cover 23 and the housing 21 can form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 21 When the end cap 23 is closed, the housing 21 is closed.
  • a pressure relief mechanism 25 may also be provided on the end cover 23 .
  • the pressure relief mechanism 25 is used to relieve the pressure inside the battery cell 20 when the pressure or temperature inside the battery cell 20 reaches a threshold value.
  • the pressure relief mechanism 25 may take the form of an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, a safety valve, a weak portion formed on the end cover 23, etc.
  • the electrode assembly 22 includes a first pole piece group 221.
  • the first pole piece group 221 includes a plurality of first pole pieces 2211 stacked along the first direction X1.
  • 2211 includes a first current collector 22111, a first positive electrode active layer 22112 and a first negative electrode active layer 22113.
  • the first positive electrode active layer 22112 and the first negative electrode active layer 22113 are respectively disposed on both sides of the first current collector 22111 along the first direction X1.
  • the first negative electrode active layer 22113 of one of the two adjacent first pole pieces 2211 faces and covers the first positive electrode active layer 22112 of the other; at least a part of the continuously arranged first electrode in the first pole piece group 221
  • the pole piece 2211 forms a first pole piece region 221a, and the length of the first positive electrode active layer 22112 of the first pole piece 2211 in the first pole piece region 221a gradually increases along the first direction X1.
  • An isolation film 222 is provided between two adjacent first pole pieces 2211 for insulating and isolating the two adjacent first pole pieces 2211 .
  • “Plural” appearing in this application means two or more (including two).
  • the first pole piece region 221a includes two or more first pole pieces 2211.
  • the first direction X1 is unidirectional, and the first direction X1 is parallel to the thickness direction of the first current collector 22111.
  • the material of the first current collector 22111 may include at least one of aluminum, copper, etc.
  • the first current collector 22111 has an opposite first surface and a second surface, the first positive electrode active layer 22112 is disposed on the first surface, and the first negative electrode active layer 22113 is disposed on the second surface.
  • the first negative active layer 22113 of one of the two adjacent first pole pieces 2211 faces and covers the first positive active layer 22112 of the other
  • the projection of one first positive electrode active layer 22112 onto the other's first negative electrode active layer 22113 is located within the first negative electrode active layer 22113 or the first projection of one of the two adjacent first pole pieces 2211
  • the outline of the projection of the positive electrode active layer 22112 on the other first negative electrode active layer 22113 coincides with the outline of the first negative electrode active layer 22113.
  • the length of the first positive electrode active layer 22112 refers to the size of the first positive electrode active layer 22112 along the length direction Y of the first pole piece.
  • the length direction Y of the first pole piece is perpendicular to the first direction X1.
  • the length of the first cathode active layer 22112 of the first pole piece 2211 in the first pole piece region 221a gradually increases along the first direction X1, so that the length of the first cathode active layer 22112 of the first pole piece region 221a can adapt to the internal space.
  • the special-shaped housing 21 enables the special-shaped internal space of the housing 21 to be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22 .
  • the first negative electrode active layer 22113 of one of the two adjacent first pole pieces 2211 faces and covers the first positive electrode active layer 22112 of the other, which can reduce the risk of lithium deposition and improve the efficiency of the battery equipped with the electrode assembly 22 Safety performance of cell 20 and battery 100.
  • the first pole piece 2211 makes full use of the special-shaped space inside the casing 21, the first pole piece 2211 is not easy to shake after the battery vibrates, so that the adjacent first pole pieces 2211 can maintain a stable stacking relationship. , further reducing the risk of lithium precipitation in the electrode assembly 22 due to the shaking of the first pole piece 2211 causing adjacent first pole pieces 2211 to be dislocated in the direction perpendicular to the first direction X1.
  • the abnormal shape of the internal space of the housing 21 may be caused by the different shapes and/or sizes of the various walls of the housing 21.
  • the housing 21 includes a first wall 212 opposite along the first direction X1 and a
  • the second wall 213 and the third wall 214 and the fourth wall 215 are opposite along the length direction Y of the first pole piece.
  • the first wall 212 and the second wall 213 have different sizes along the length direction Y of the first pole piece, and Both ends of the second wall 213 along the length direction Y of the first pole piece exceed both ends of the first wall 212 along the length direction Y of the first pole piece.
  • the third wall 214 is connected to the first wall 212 along the length direction Y of the first pole piece.
  • the third wall 214 is arranged at an obtuse angle and an acute angle with the first wall 212 and the second wall 213 respectively;
  • the fourth wall 215 Connected between the other end of the first wall 212 along the length direction Y of the first pole piece and the other end of the second wall 213 along the length direction Y of the first pole piece, the fourth wall 215 is connected to the first wall 212 and the first pole piece respectively.
  • the two walls 213 are arranged at an obtuse angle and an acute angle, so that the two first walls 212 and the two second walls 213 jointly enclose the special-shaped internal space.
  • the length of the first negative active layer 22113 of the first pole piece 2211 in the first pole piece region 221a gradually increases along the first direction X1.
  • the length of the first negative electrode active layer 22113 refers to the size of the first negative electrode active layer 22113 along the length direction Y of the first pole piece.
  • the length of the first positive electrode active layer 22112 is longer, the length of the first negative electrode active layer 22113 facing and covering the first positive electrode active layer 22112 will also be correspondingly longer to reduce the risk of lithium deposition in the electrode assembly 22 .
  • the length of the first positive electrode active layer 22112 is smaller, the length of the first negative electrode active layer 22113 facing and covering the first positive electrode active layer 22112 will also be correspondingly smaller, which not only reduces the risk of lithium deposition, but also avoids waste of active materials. .
  • the length of the first negative electrode active layer 22113 of the first pole piece 2211 gradually increases along the first direction X1, so that in the first pole piece region 221a, the longer the length of the first positive electrode active layer 22112 The length of the corresponding first negative active layer 22113 is also larger.
  • the length of the first negative electrode active layer 22113 of the first pole piece 2211 in the first pole piece region 221a gradually increases along the first direction
  • the changing trend of the length of 22113 along the first direction X1 is the same as the changing trend of the length of the first positive electrode active layer 22112 along the first direction
  • the length change trend of 22113 adapts to the change trend of the length of the first positive electrode active layer 22112, so that the length of the first negative electrode active layer 22113 in the first pole piece region 221a can adapt to the special-shaped housing 21 in the internal space, so that the special-shaped housing 21 can
  • the internal space can be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 including the electrode assembly 22; and also avoids waste of active materials.
  • the length of the first negative electrode active layer 22113 of each first pole piece 2211 can also be the same, and the length of each first negative electrode active layer 22113 faces and covers the largest length.
  • the lengths of the first positive electrode active layer 22112 and the first negative electrode active layer 22113 are the same.
  • the edge of the first negative active layer 22113 exceeds the edge of the first positive active layer 22112; or, the edge of the first negative active layer 22113 is in contact with the first positive active layer 22112. The edges are flush.
  • the edge of the first negative active layer 22113 exceeds the edge of the first positive active layer 22112 may mean that part of the edge of the first negative active layer 22113 exceeds the edge of the first positive active layer 22112. Another part of the edge of the negative active layer 22113 is flush with the edge of the first positive active layer 22112.
  • the two edges of the first negative active layer 22113 along the length direction Y of the first pole piece exceed the two edges of the first positive active layer 22112 along the length direction Y of the first pole piece, and the first negative active layer 22113 extends along the length direction Y of the first pole piece.
  • the first direction X1, the length direction Y of the first pole piece, and the width direction Z of the first pole piece are two perpendicular to each other.
  • the edge of the first negative active layer 22113 exceeds the edge of the first positive active layer 22112 may mean that all edges of the first negative active layer 22113 exceed the edge of the first positive active layer 22112, that is, the first negative active layer 22113 extends along the edge of the first negative active layer 22113.
  • the two edges of a pole piece in the length direction Y exceed the two edges of the first positive active layer 22112 along the length direction Y of the first pole piece, and the two edges of the first negative active layer 22113 along the width direction Z of the first pole piece The edges extend beyond the two edges of the first positive electrode active layer 22112 along the width direction Z of the first pole piece.
  • the edge of the first negative active layer 22113 is flush with the edge of the first positive active layer 22112
  • all edges of the first negative active layer 22113 are flush with the edge of the first positive active layer 22112. All edges are flush, that is, the two edges of the first negative active layer 22113 along the length direction Y of the first pole piece are flush with the two edges of the first positive active layer 22112 along the length direction Y of the first pole piece.
  • the first The two edges of the negative active layer 22113 along the width direction Z of the first pole piece are flush with the two edges of the first positive active layer 22112 along the width direction Z of the first pole piece.
  • the edge of the first negative active layer 22113 exceeds the edge of the first positive active layer 22112 or the edge of the first negative active layer 22113 is flush with the edge of the first positive active layer 22112. The risk of lithium precipitation is reduced, and the safety performance of the battery cell 20 and battery 100 equipped with the electrode assembly 22 is improved.
  • the edge of the first positive electrode active layer 22112 of the first electrode piece 2211 can also exceed the edge of the first negative electrode active layer 22113, as long as the first negative electrode active layer 22113 can cover the first positive electrode active layer it faces. Layer 22112 is enough.
  • both ends of one of the two adjacent first positive electrode active layers 22112 exceed the other along the length direction Y of the first pole piece. Both ends of one of the two adjacent first negative active layers 22113 extend beyond both ends of the other along the length direction Y of the first pole piece; and/or The length direction Y is perpendicular to the first direction X1.
  • both ends of one of the two adjacent first positive electrode active layers 22112 exceed both ends of the other along the length direction Y of the first pole piece
  • the two adjacent first negative electrode active layers Both ends of one of the two adjacent first negative active layers 22113 along the length direction Y of the first pole piece can exceed both ends of the other; or one of the two adjacent first negative active layers 22113 can extend along the length of the first pole piece.
  • One end of the direction Y is flush with one end of the other, and the other end of one of the two adjacent first negative active layers 22113 exceeds the other end of the other along the length direction Y of the first pole piece; or The two ends of one of the two adjacent first negative electrode active layers 22113 along the length direction Y of the first pole piece are flush with the two ends of the other one.
  • both ends of one of the two adjacent first cathode active layers 22112 extend beyond both ends of the other along the length direction Y of the first pole piece
  • the adjacent two first cathode active layers 22112 Both ends of one of the 22112 along the width direction Z of the first pole piece may exceed both ends of the other along the width direction Z of the first pole piece; or the two adjacent first positive electrode active layers 22112
  • the two ends of one along the width direction Z of the first pole piece may be flush with the two ends of the other along the width direction Z of the first pole piece; or one of the two adjacent first positive electrode active layers 22112
  • One end along the width direction Z of the first pole piece is flush with the other end along the width direction Z of the first pole piece, and one of the two adjacent first positive electrode active layers 22112 is aligned with the end along the width direction Z of the first pole piece.
  • the other end in the width direction Z exceeds the other end along the width direction Z of the first pole piece.
  • the casing 21 whose internal space is shaped at both ends along the length direction Y of the first pole piece enables the special-shaped internal space of the casing 21 to be fully utilized, thereby conducive to improving the performance of the battery cell 20 and battery equipped with the electrode assembly 22 100 energy density.
  • one end of one of the two adjacent first positive electrode active layers 22112 along the length direction Y of the first pole piece is aligned with the other end of the two adjacent first cathode active layers 22112.
  • One end of the first pole piece in the length direction Y is flush; and/or one end of one of the two adjacent first negative electrode active layers 22113 along the length direction Y of the first pole piece is aligned with the other end of the first pole piece along the length direction Y.
  • One end of the length direction Y of the piece is flush; the length direction Y of the first pole piece is perpendicular to the first direction X1.
  • the length of the first positive electrode active layer 22112 of the first pole piece 2211 gradually increases.
  • one end of the length direction Y is flush with the other end along the length direction Y of the first pole piece, one of the two adjacent first positive electrode active layers 22112 is along the length direction Y of the first pole piece. The other end exceeds the other end along the length direction Y of the first pole piece.
  • the adjacent Both ends of one of the two first negative active layers 22113 along the length direction Y of the first pole piece can exceed both ends of the other; or one of the two adjacent first negative active layers 22113
  • One end of one of the two adjacent first negative electrode active layers 22113 along the length direction Y of the first pole piece is flush with one end of the other, and the other end of one of the two adjacent first negative electrode active layers 22113 exceeds the other end of the first pole piece along the length direction Y.
  • the other end of one; or the two ends of one of the two adjacent first negative active layers 22113 along the length direction Y of the first pole piece are flush with the two ends of the other.
  • One end of one of the two adjacent first positive electrode active layers 22112 along the length direction Y of the first pole piece is flush with one end of the other one along the length direction Y of the first pole piece, and/or, adjacent One end of one of the two first negative electrode active layers 22113 along the length direction Y of the first pole piece is flush with one end of the other one along the length direction Y of the first pole piece, so that the first positive electrode of the first pole piece region 221a
  • the active layer 22112 and/or the first negative active layer 22113 can adapt to the housing 21 whose internal space is irregularly shaped at one end and regular at the other end along the length direction Y of the first pole piece, so that the internal space of the housing 21 can be fully utilized, thereby having It is beneficial to increase the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22 .
  • the housing 21 may have a first wall 212 and a second wall 213 that are opposite along the first direction X1 and a third wall 214 and a fourth wall 215 that are opposite along the length direction Y of the first pole piece.
  • the wall 212 and the second wall 213 are aligned along one end of the length direction Y of the first pole piece and connected by a third wall 214 .
  • the other end of the second wall 213 along the length direction Y of the first pole piece exceeds the other end of the first wall 212 along the length direction Y of the first pole piece, and is connected by a fourth wall 215, which is opposite to the first wall.
  • 212 and the second wall 213 are arranged at an obtuse angle and an acute angle respectively, so that the first wall 212, the second wall 213, the third wall 214 and the fourth wall 215 together form a special-shaped internal space.
  • the length of the first positive active layer 22112 of all the first pole pieces 2211 in the first pole piece group 221 gradually increases along the first direction X1, then the first pole piece region 221a is the One pole piece set of 221 pieces.
  • the first pole pieces 2211 continuously arranged in the first pole piece group 221 form a first pole piece region 221a, and another portion of the first pole pieces in the first pole piece group 221 2211 forms the second pole piece region 221b.
  • the first pole piece 2211 with the largest and smallest length of the first positive electrode active layer 22112 is the first pole piece unit 2211a and the second pole piece unit 2211b respectively;
  • the diode piece region 221b is disposed on one side of the first pole piece region 221a, and the second pole piece region 221b is disposed on a side of the first pole piece unit 2211a away from the second pole piece unit 2211b.
  • the piece 2211 is the same as the first pole piece unit 2211a.
  • the first pole piece 2211 in the second pole piece region 221b is the same as the first pole piece unit 2211a", including the length of the first positive electrode active material layer of the first pole piece 2211 in the second pole piece region 221b and the first pole piece
  • the length of the first positive active layer 22112 of the unit 2211a is the same, the length of the first negative active material layer of the first pole piece 2211 in the second pole piece region 221b and the length of the first negative active layer 22113 of the first pole piece unit 2211a. same.
  • the first negative active layer 22113 of the first pole piece 2211 in the second pole piece region 221b is disposed facing the first pole piece unit 2211a.
  • the number of first pole pieces 2211 in the second pole piece region 221b may be one or multiple.
  • the first pole piece 2211 in the second pole piece region 221b is the same as the first pole piece 2211 with the longest length of the first positive electrode active layer 22112 in the first pole piece region 221a, so that the electrode assembly 22 can adapt to the partially regular internal space.
  • the other part of the special-shaped housing 21 enables the internal space of the housing 21 to be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22 .
  • the special-shaped internal space of the housing 21 can also be formed in other ways.
  • the housing 21 has a first wall 212 and a second wall 213 opposite to each other along the first direction X1 and along the length of the first pole piece.
  • the third wall 214 and the fourth wall 215 are opposite in the direction Y.
  • the size of the first wall 212 along the length direction Y of the first pole piece is smaller than the size of the second wall 213 along the length direction Y of the first pole piece, and the second wall Both ends of 213 along the length direction Y of the first pole piece exceed both ends of the first wall 212 along the length direction Y of the first pole piece.
  • the third wall 214 and the fourth wall 215 are respectively connected to both ends of the second wall 213 along the length direction Y of the first pole piece and extend in a direction close to the first wall 212.
  • the third wall 214 and the fourth wall 215 are both vertical.
  • the housing 21 also includes a first transition wall 216 and a second transition wall 217.
  • the first transition wall 216 is connected between an end of the third wall 214 away from the second wall 213 and the first wall 212 along the length direction Y of the first pole piece.
  • first wall 212 and the third wall 214 are arranged at an obtuse angle with the first transition wall 216; the second transition wall 217 is connected to the end of the fourth wall 215 away from the second wall 213 and along the first wall 212 Between the other end of the first pole piece in the length direction Y, the first wall 212 and the fourth wall 215 are arranged at an obtuse angle to the second transition wall 217, so that the first wall 212, the second wall 213, the third wall 214, the fourth wall 215, the first transition wall 216 and the second transition wall 217 together form a special-shaped internal space.
  • the second pole piece unit 2211b is located at one end of the electrode assembly 22 along the second direction X2, and the first direction X1 is opposite to the second direction X2.
  • the second pole piece unit 2211b is located at one end of the electrode assembly 22 along the second direction X2. It can be understood that there are no other pole pieces on the side of the second pole piece unit 2211b away from the first pole piece unit 2211a.
  • the length of the first positive electrode active layer 22112 of the second pole piece unit 2211b is the smallest and the second pole piece unit 2211b is located at one end of the electrode assembly 22 along the second direction
  • One pole piece 2211 can adapt to the special-shaped internal space of the case 21, so that the special-shaped internal space of the case 21 can be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22.
  • the first pole piece group 221 further includes a first end pole piece 2212.
  • the first end pole piece 2212 is disposed on the side of the second pole piece unit 2211b away from the first pole piece unit 2211a.
  • the first end pole piece 2212 includes a first end current collector 22121 and a first end positive electrode active layer 22122 disposed on a side of the first end current collector 22121 facing the second pole piece unit 2211b.
  • the second pole piece unit The first negative electrode active layer 22113 of 2211b faces and covers the first end positive electrode active layer 22122 of the first end pole piece 2212.
  • the side of the first end current collector 22121 facing away from the second pole piece unit 2211b may not be provided with an active layer.
  • the electrode assembly 22 also includes a second pole piece 225, along the first direction X1, the second pole piece 225 is disposed on one side of the first pole piece group 221, and It is arranged adjacent to the one with the longest length of the first positive electrode active layer 22112 in the first pole piece group 221; along the second pole piece 225, it includes the second current collector 2251 and the second negative electrode active layer 2252.
  • the A second negative electrode active layer 2252 is provided on at least one side of the second current collector 2251 facing the first pole piece 2211.
  • the second negative electrode active layer 2252 on the side of the second current collector 2251 facing the first pole piece 2211 is adjacent to the first negative electrode active layer 2252.
  • the first positive electrode active layer 22112 of the pole piece 2211 is arranged opposite to and covers the first positive electrode active layer 22112.
  • the second current collector 2251 has an opposing third surface and a fourth surface, the third surface is disposed facing the first pole piece region 221a, and at least the third surface is provided with the second negative electrode active layer 2252.
  • the second pole piece 225 is arranged adjacent to the first pole piece unit 2211a, and the second current collector 2251 faces the first pole piece.
  • the second negative electrode active layer 2252 on one side of the group 221 is disposed facing and covering the first positive electrode active layer 22112 of the first pole piece unit 2211a.
  • the second pole piece 225 and the second pole piece region 221b are furthest away from the first pole piece region 221a.
  • the first pole pieces 2211 are arranged adjacently, and the second negative electrode active layer 2252 on the side of the second current collector 2251 facing the first pole piece group 221 faces and covers the first positive electrode active layer 22112 of the first pole piece 2211.
  • the second pole piece 225 is disposed, and the second negative electrode active layer 2252 on the side of the second pole piece 225 facing the first pole piece 2211 is opposite to the first positive electrode active layer 22112 of the adjacent first pole piece 2211 and covers the first pole piece 2211 .
  • the positive active layer 22112 is such that the first positive active layer 22112 of each first pole piece 2211 in the first pole piece group 221 has a corresponding negative active layer, so that each first pole piece 2211 in the first pole piece group 221
  • the ions detached from the first positive electrode active layer 22112 of each first pole piece 2211 can be absorbed by the negative electrode active layer, which can improve the energy density of the battery cell 20 and the battery 100 including the electrode assembly 22, and also reduce the risk of lithium evolution. risk.
  • the second current collector 2251 may be provided with the second negative electrode active layer 2252 only on the surface facing the first pole piece group 221, that is, only the second negative electrode active layer 2252 is provided on the third surface (as shown in FIGS. 12 and 13). As shown in FIG. 14 , in other embodiments, along the first direction X1 , second negative electrode active layers 2252 are provided on both sides of the second current collector 2251 . That is, both the third surface and the fourth surface are provided with the second negative electrode active layer 2252.
  • the second negative electrode active layer 2252 is provided on both sides of the second current collector 2251 along the first direction X1, and the second pole piece 225 can be provided with a corresponding positive electrode active layer on both sides along the first direction
  • the energy density of the battery cells 20 and battery 100 of the electrode assembly 22 is provided.
  • the housing 21 may have a first wall 212 and a second wall 213 opposite along the first direction X1 and a third wall 214 and a fourth wall 215 opposite along the length direction Y of the first pole piece.
  • the first wall 212 and the second wall 213 are aligned along one end of the length direction Y of the first pole piece and connected by a third wall 214 .
  • the other end of the second wall 213 along the length direction Y of the first pole piece exceeds the other end of the first wall 212 along the length direction Y of the first pole piece.
  • the fourth wall 215 is perpendicular to the second wall 213 and connected to the second wall. 213 is away from the third wall 214.
  • the size of the fourth wall 215 along the first direction X1 is smaller than the size of the third wall 214 along the first direction.
  • the housing 21 also includes a second transition wall 217 connected between an end of the first wall 212 facing away from the third wall 214 and an end of the fourth wall 215 facing away from the second wall 213.
  • the second transition wall 217 is opposite.
  • the first wall 212 and the fourth wall 215 are both arranged at an obtuse angle, so that the first wall 212 , the second wall 213 , the third wall 214 , the fourth wall 215 and the second transition wall 217 together form a special-shaped internal space.
  • the electrode assembly 22 only includes the first pole piece group 221
  • the first positive electrode active layer 22112 of one of the two adjacent first pole pieces 2211 and the first negative electrode active layer 22113 of the other are arranged oppositely.
  • the first positive electrode active layers 22112 and the first negative electrode active layers 22113 of the plurality of first pole pieces 2211 are alternately arranged in the first direction X1 to realize the internal series-connected electrode assembly 22 .
  • the first current collectors 22111 of the two first pole pieces 2211 located at both ends of the electrode assembly 22 among the plurality of first pole pieces 2211 are respectively provided with positive electrode tabs 223 and negative electrode tabs 224.
  • the positive electrode tab 223 and the negative electrode tab 224 extend out of the first current collector 22111 along the width direction Z of the first pole piece. 15 and 16 , the positive electrode tab 223 and the negative electrode tab 224 may be located on the same side of the electrode assembly 22 along the width direction Z of the first pole piece, then the positive electrode terminal 24a and the negative electrode terminal 24b are disposed on the same side. On one end cap 23. As shown in FIGS. 17 and 18 , the positive electrode tab 223 and the negative electrode tab 224 may be located on both sides of the electrode assembly 22 along the width direction Z of the first pole piece, then the positive electrode terminal 24a and the negative electrode terminal 24b are along the first direction X1 Relative settings.
  • the second current collector 2251 of the second pole piece 225 is formed with a negative electrode tab on one side of the second pole piece 225 in the width direction. 224.
  • the current collector of the one of the first pole piece set 221 that is farthest from the second pole piece 225 (the second pole piece unit 2211b or the first end pole piece 2212) is in the width direction of the second pole piece 225.
  • a positive electrode lug 223 is provided on the side.
  • Figures 19 and 20 show that the first end pole piece 2212 is the farthest away from the second pole piece 225 in the first pole piece group 221, and the first end current collector 22121 of the first end pole piece 2212 is along the first end pole piece 2212.
  • a positive tab 223 is formed on one side of one pole piece in the width direction Z.
  • the positive electrode tab 223 and the negative electrode tab 224 may be disposed on the same side of the electrode assembly 22 , or may be disposed on opposite sides of the electrode assembly 22 (as shown in FIG. 21 ).
  • the width direction of the second pole piece 225 is parallel to the width direction Z of the first pole piece, and the length direction of the second pole piece 225 is parallel to the length direction Y of the first pole piece.
  • the second pole piece group 226 is disposed on the side of the second pole piece 225 away from the first pole piece group 221; the second pole piece group 226 includes at least one third pole piece 2261, and the third pole piece 2261 includes a third pole piece 2261.
  • Fluid 22611, third positive electrode active layer 22612 and third negative electrode active layer 22613, in the first direction The layer 22613 is disposed on the side of the third current collector 22611 facing away from the second pole piece 225 .
  • the second negative active layer 2252 of the second pole piece 225 facing the third pole piece 2261 covers the third positive active layer 22612 of the adjacent third pole piece 2261.
  • the arrangement of the second pole piece group 226 can improve the energy density of the battery cell 20 and the battery 100 including the electrode assembly 22 .
  • the edge of the third negative active layer 22613 exceeds the edge of the third positive active layer 22612; or, the edge of the third negative active layer 22613 is in contact with the third positive active layer 22612. The edges are flush.
  • the edge of the third negative electrode active layer 22613 exceeds the edge of the third positive electrode active layer 22612 may mean that part of the edge of the third negative electrode active layer 22613 exceeds the edge of the third positive electrode active layer 22612. Another part of the edge of the third negative electrode active layer 22613 is flush with the edge of the third positive electrode active layer 22612.
  • the two edges of the third negative active layer 22613 along the length direction of the third pole piece 2261 exceed the two edges of the third positive active layer 22612 along the length direction of the third pole piece 2261.
  • the two edges of the third electrode piece 2261 in the width direction are flush with the two edges of the third positive electrode active layer 22612 along the width direction of the third electrode piece 2261 .
  • the length direction of the third pole piece 2261 is parallel to the length direction Y of the first pole piece, and the width direction of the third pole piece 2261 is parallel to the width direction Z of the first pole piece.
  • the edge of the third negative electrode active layer 22613 exceeds the edge of the third positive electrode active layer 22612 may mean that all edges of the third negative electrode active layer 22613 exceed the edge of the third positive electrode active layer 22612, that is, the third negative electrode active layer 22613 extends along the edge of the third positive electrode active layer 22612.
  • the two edges of the three-pole piece 2261 in the length direction exceed the two edges of the third positive active layer 22612 along the length direction Y of the first pole piece, and the two edges of the third negative active layer 22613 along the width direction of the third pole piece 2261 The edges extend beyond the two edges of the third positive electrode active layer 22612 along the width direction of the third pole piece 2261.
  • the two edges of the negative active layer 22613 along the width direction of the third pole piece 2261 are flush with the two edges of the third positive active layer 22612 along the width direction of the third pole piece 2261 .
  • the edge of the third negative active layer 22613 exceeds the edge of the third positive active layer 22612 or the edge of the third negative active layer 22613 is flush with the edge of the third positive active layer 22612. The risk of lithium precipitation is reduced, and the safety performance of the battery cell 20 and battery 100 equipped with the electrode assembly 22 is improved.
  • the number of the third pole piece 2261 may be one or multiple.
  • the second pole piece group 226 includes a plurality of third pole pieces 2261, and the plurality of third pole pieces 2261 are arranged along the second direction X2, and the second direction X2 is opposite to the first direction X1.
  • the third negative electrode active layer 22613 of one of the two adjacent third pole pieces 2261 faces and covers the third positive electrode active layer 22612 of the other to reduce the risk of lithium precipitation.
  • the second pole piece set 226 includes a plurality of third pole pieces 2261, so that the battery cell 20 and the battery 100 equipped with the electrode assembly 22 can have higher energy density.
  • the third negative active layer 22613 of one of the two adjacent third pole pieces 2261 faces and covers the other.
  • a third positive electrode active layer 22612 and at least a portion of the third electrode pieces 2261 continuously arranged in the second electrode piece group 226 form a third electrode piece region 226a, and the third positive electrode of the third electrode piece 2261 in the third electrode piece region 226a
  • the length of the active layer 22612 gradually increases along the second direction X2.
  • the third negative active layer 22613 of one of the two adjacent third pole pieces 2261 faces and covers the third positive active layer 22612 of the other
  • the projection of the third positive electrode active layer 22612 of one onto the third negative electrode active layer 22613 of the other is located within the third negative electrode active layer 22613 or the third of one of the two adjacent third pole pieces 2261
  • the outline of the projection of the positive electrode active layer 22612 on the other third negative electrode active layer 22613 coincides with the outline of the third negative electrode active layer 22613.
  • the length of the third positive electrode active layer 22612 refers to the size of the third positive electrode active layer 22612 along the length direction of the third electrode piece 2261.
  • the length of the third cathode active layer 22612 of the third pole piece 2261 in the third pole piece region 226a gradually increases along the second direction X2, so that the length of the third cathode active layer 22612 of the third pole piece region 226a can adapt to the internal space.
  • the special-shaped housing 21 enables the special-shaped internal space of the housing 21 to be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22 .
  • the third negative electrode active layer 22613 of one of the two adjacent third pole pieces 2261 faces and covers the third positive electrode active layer 22612 of the other, which can reduce the risk of lithium deposition and improve the efficiency of the battery equipped with the electrode assembly 22 Safety performance of cell 20 and battery 100.
  • the length of the third negative active layer 22613 of the third pole piece 2261 in the third pole piece region 226a gradually increases along the second direction X2.
  • the length of the third negative electrode active layer 22613 refers to the size of the third negative electrode active layer 22613 along the length direction of the third electrode piece 2261.
  • the length of the third positive electrode active layer 22612 is longer, the length of the third negative electrode active layer 22613 facing and covering the third positive electrode active layer 22612 will also be correspondingly longer to reduce the risk of lithium deposition in the electrode assembly 22 .
  • the length of the third positive electrode active layer 22612 is smaller, the length of the third negative electrode active layer 22613 facing and covering the third positive electrode active layer 22612 will also be correspondingly smaller, which not only reduces the risk of lithium deposition, but also avoids waste of active materials. .
  • the length of the third negative electrode active layer 22613 of the third pole piece 2261 gradually increases along the second direction X2, so that in the third pole piece region 226a, the longer the third cathode active layer 22612 The length of the corresponding third negative active layer 22613 is also larger.
  • the length of the third negative electrode active layer 22613 of the third pole piece 2261 in the third pole piece region 226a gradually increases along the second direction
  • the changing trend of the length of 22613 along the second direction X2 is the same as the changing trend of the length of the third positive electrode active layer 22612 along the third direction, so that the third negative active layer 22613
  • the length change trend adapts to the change trend of the length of the third positive electrode active layer 22612, so that the length of the third negative electrode active layer 22613 in the third electrode piece region 226a can adapt to the special-shaped internal space of the housing 21, so that the special-shaped interior of the housing 21
  • the space can be fully utilized, thereby improving the energy density of the battery cell 20 and the battery 100 having the electrode assembly 22; and also avoiding the waste of active materials.
  • the length of the third negative electrode active layer 22613 of each third electrode piece 2261 can also be the same, and the length of each third negative electrode active layer 22613 faces and covers the largest length.
  • the lengths of the third positive electrode active layer 22612 and the third negative electrode active layer 22613 are the same.
  • both ends of one of the two adjacent third positive electrode active layers 22612 exceed the other along the length direction of the third electrode plate 2261. and/or both ends of one of the two adjacent third negative electrode active layers 22613 along the length direction of the third pole piece 2261 exceed both ends of the other.
  • both ends of one of the two adjacent third positive electrode active layers 22612 exceed both ends of the other along the length direction of the third pole piece 2261
  • the two adjacent third negative electrode active layers Both ends of one of the 22613 along the length direction of the third pole piece 2261 may exceed both ends of the other; or one of the two adjacent third negative electrode active layers 22613 can extend along the length direction of the third pole piece 2261.
  • One end in the length direction is flush with one end of the other, and the other end of one of the two adjacent third negative active layers 22613 along the length direction of the third pole piece 2261 exceeds the other end of the other; or The two ends of one of the two adjacent third negative electrode active layers 22613 along the length direction of the third pole piece 2261 are flush with the two ends of the other.
  • Figure 24 shows that in the third pole piece region 226a, both ends of one of the two adjacent third positive electrode active layers 22612 along the length direction of the third pole piece 2261 exceed both ends of the other; and The situation in which both ends of one of the two adjacent third negative electrode active layers 22613 along the length direction of the third pole piece 2261 exceed both ends of the other.
  • both ends of one of the two adjacent third cathode active layers 22612 exceed both ends of the other along the length direction of the third pole piece 2261
  • the two adjacent third cathode active layers Both ends of one of the 22612 along the width direction of the third pole piece 2261 may exceed both ends of the other along the width direction of the third pole piece 2261; or the two adjacent third positive electrode active layers 22612
  • the two ends of one along the width direction of the third pole piece 2261 may be flush with the two ends of the other along the width direction of the third pole piece 2261; or one of the two adjacent third positive electrode active layers 22612
  • One end along the width direction of the third pole piece 2261 is flush with the other end along the width direction of the third pole piece 2261
  • one of the two adjacent third positive electrode active layers 22612 is along the third pole piece 2261
  • the other end in the width direction of the third pole piece 2261 exceeds the other end in the width direction of the third pole piece 2261 .
  • the casing 21 whose internal space is shaped at both ends along the length direction of the third pole piece 2261 enables the special-shaped internal space of the casing 21 to be fully utilized, thereby conducive to improving the battery cell 20 and the battery equipped with the electrode assembly 22 100 energy density.
  • the special-shaped internal space of the housing 21 can also be formed in other ways, such as a corner area, such as an arc-shaped corner, formed between two adjacent walls of the housing 21 .
  • the housing 21 may have a first wall 212 and a second wall 213 opposite along the first direction X1 and a third wall 214 and a fourth wall 215 opposite along the length direction Y of the first pole piece.
  • the first wall 212, the third wall 214, the second wall 213 and the fourth wall 215 are finally connected in sequence.
  • the first wall 212 and the third wall 214 are connected by an arcuate wall 218 to form a corner area A
  • the third wall 214 and the second wall 213 are connected by an arcuate wall 218 to form a corner area A
  • the wall 213 and the fourth wall 215 are connected by an arcuate wall 218 to form a corner area A
  • the fourth wall 215 and the first wall 212 are connected by an arcuate wall 218 to form a corner area A.
  • the first wall 212 , the second wall 213, the third wall 214, the fourth wall 215 and the four arc-shaped walls together form a special-shaped internal space.
  • one end of one of the two adjacent third positive electrode active layers 22612 along the length direction of the third pole piece 2261 is aligned with the other end of the third pole piece 2261 .
  • One end of the third pole piece 2261 in the length direction is flush; and/or one end of one of the two adjacent third negative active layers 22613 along the length direction of the third pole piece 2261 is aligned with the other end of the third pole piece 2261 along the third pole.
  • One end of the length direction of the piece 2261 is flush.
  • the length of the third positive electrode active layer 22612 of the third electrode piece 2261 gradually increases.
  • one of the two adjacent third positive electrode active layers 22612 is along the length direction of the third pole piece 2261. The other end exceeds the other end along the length direction of the third pole piece 2261.
  • the adjacent Both ends of one of the two third negative active layers 22613 along the length direction of the third pole piece 2261 can exceed both ends of the other; or one of the two adjacent third negative active layers 22613
  • One end of one of the two adjacent third negative active layers 22613 along the length direction of the third pole piece 2261 is flush with one end of the other, and the other end of one of the two adjacent third negative active layers 22613 along the length direction of the third pole piece 2261 exceeds the other end.
  • the other end of one; or the two ends of one of the two adjacent third negative active layers 22613 along the length direction of the third pole piece 2261 are flush with the two ends of the other.
  • One end of one of the two adjacent third positive electrode active layers 22612 along the length direction of the third pole piece 2261 is flush with one end of the other one along the length direction of the third pole piece 2261, and/or adjacent One end of one of the two third negative active layers 22613 along the length direction of the third pole piece 2261 is flush with one end of the other along the length direction Y of the first pole piece, so that the third positive electrode of the third pole piece region 226a
  • the active layer 22612 and/or the third negative active layer 22613 can adapt to the housing 21 whose internal space is irregularly shaped at one end and regular at the other end along the length direction of the third pole piece 2261, so that the internal space of the housing 21 can be fully utilized, thereby having It is beneficial to increase the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22 .
  • the length of the second positive active layer of all the second pole pieces 225 in the second pole piece group 226 gradually increases along the second direction X2, then the third pole piece region 226a is the second pole piece group. 226.
  • the third pole piece 2261 continuously arranged in the second pole piece group 226 forms a third pole piece region 226a
  • another part of the third pole piece 2261 in the third pole piece group 2261 2261 forms the fourth pole piece region 226b.
  • the third pole piece 2261 with the largest and smallest length of the third positive electrode active layer 22612 is the third pole piece unit 2261a and the fourth pole piece unit 2261b respectively;
  • the quadrupole piece region 226b is disposed on one side of the third pole piece region 226a, and the fourth pole piece region 226b is disposed on a side of the third pole piece unit 2261a away from the fourth pole piece unit 2261b.
  • the third pole in the fourth pole piece region 226b Piece 2261 is the same as third pole piece unit 2261a.
  • the third pole piece 2261 in the fourth pole piece region 226b is the same as the third pole piece unit 2261a”, including the length of the third positive electrode active material layer of the third pole piece 2261 in the fourth pole piece region 226b and the third pole piece
  • the length of the third positive active layer 22612 of the unit 2261a is the same, the length of the third negative active material layer of the third pole piece 2261 in the fourth pole piece region 226b and the length of the third negative active layer 22613 of the third pole piece unit 2261a. same.
  • the third negative active layer 22613 of the third pole piece 2261 of the fourth pole piece region 226b is disposed facing the third pole piece unit 2261a.
  • the number of the third pole piece 2261 in the fourth pole piece region 226b may be one or multiple.
  • the third pole piece 2261 in the fourth pole piece region 226b is the same as the third pole piece 2261 with the longest length of the third positive electrode active layer 22612 in the third pole piece region 226a, so that the electrode assembly 22 can adapt to the partially regular internal space.
  • the other part of the special-shaped housing 21 enables the internal space of the housing 21 to be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22 .
  • the fourth pole piece unit 2261b is located at one end of the electrode assembly 22 along the first direction X1.
  • the fourth pole piece unit 2261b is located at one end of the electrode assembly 22 along the first direction X1. It can be understood that there are no other pole pieces on the side of the fourth pole piece unit 2261b away from the third pole piece unit 2261a.
  • the length of the third positive active layer 22612 of the fourth pole piece unit 2261b is the smallest and the fourth pole piece unit 2261b is located at one end of the electrode assembly 22 along the first direction
  • the three-pole piece 2261 can adapt to the special-shaped internal space of the housing 21, so that the special-shaped internal space of the housing 21 can be fully utilized, which is beneficial to improving the energy density of the battery cell 20 and the battery 100 equipped with the electrode assembly 22.
  • the second pole piece group 226 further includes a second end pole piece 2262, and the second end pole piece 2262 is disposed on the side of the fourth pole piece unit 2261b away from the third pole piece unit 2261a.
  • the second end pole piece 2262 includes a second end current collector 22621 and a second end positive electrode active layer 22622 disposed on a side of the second end current collector 22621 facing the fourth pole piece unit 2261b.
  • the third negative active layer 22613 of 2261b faces and covers the second end positive active layer 22622 of the second end pole piece 2262.
  • the side of the second end current collector 22621 facing away from the fourth pole piece unit 2261b may not be provided with an active layer.
  • first pole piece group 221 and the second pole piece group 226 are arranged symmetrically with respect to the second pole piece 225 . That is, each first pole piece 2211 of the first pole piece group 221 is equal or equivalent in shape, size, length, and arrangement to each third pole piece 2261 of the second pole piece group 226 in shape, size, length, and arrangement.
  • the first pole piece set 221 and the second pole piece set 226 are arranged symmetrically with respect to the second pole piece 225 so that the length of the third positive active layer 22612 of the second pole piece set 226 can adapt to the special-shaped housing 21 in the internal space, and the The electrode assembly 22 can adapt to the internal space of the special-shaped housing 21 on both sides along the first direction Energy density of battery 100.
  • the first pole piece group 221 and the third pole piece group 2261 can also be arranged asymmetrically.
  • both ends of one of the two adjacent first positive electrode active layers 22112 along the length direction Y of the first pole piece exceed both ends of the other one.
  • Both ends of one of the two adjacent first negative electrode active layers 22113 along the length direction Y of the first pole piece exceed both ends of the other one.
  • one end of one of the two adjacent third positive electrode active layers 22612 along the length direction of the third pole piece 2261 is flush with the end of the other one along the length direction of the third pole piece 2261;
  • One end of one of the two adjacent third negative electrode active layers 22613 along the length direction of the third pole piece 2261 is flush with one end of the other along the length direction Y of the first pole piece.
  • the two ends of the second negative active layer 2252 along the length direction of the third pole piece 2261 and the two ends of the third negative active layer 22613 along the length direction of the third pole piece 2261 are flat.
  • the length direction of the third pole piece 2261 is perpendicular to the first direction X1.
  • the length of the third active layer is the same as the length of the second active layer.
  • the length of the second active layer is the dimension of the second active layer along the length direction of the second pole piece 225
  • the length of the third active layer is the dimension of the third active layer along the length direction of the third pole piece 2261 .
  • the two ends of the second negative electrode active layer 2252 along the length direction of the third electrode piece 2261 are flush with the two ends of the third negative electrode active layer 22613 along the length direction of the third electrode piece 2261, so that the length of the third negative electrode active layer 22613 is sufficient. It is large, which can reduce the risk of lithium precipitation and improve the safety performance of the battery cell 20 and battery 100 equipped with the electrode assembly 22 .
  • each third pole piece 2261 may be the same. “Each third pole piece 2261 is the same” includes that the length of the third negative electrode active material layer of each third pole piece 2261 is the same, and the length of the third positive electrode active material layer of each third pole piece 2261 is the same.
  • An embodiment of the present application also provides a battery cell 20, including the electrode assembly 22 provided in any of the above embodiments.
  • the electrode assembly 22 provided in any of the above embodiments can adapt to special-shaped spaces and has a low risk of lithium precipitation. Accommodating the electrode assembly 22 in the housing 21 with a special-shaped space inside can make full use of the special-shaped internal space of the housing 21 , thereby helping to improve the energy density and safety performance of the battery cell 20 equipped with the electrode assembly 22 .
  • An embodiment of the present application also provides a battery 100, which includes a box 10 and the battery cells 20 provided in any of the above embodiments.
  • the battery cells 20 are accommodated in the box 10.
  • the battery cell 20 provided by any of the above embodiments has higher energy density and lower risk of lithium precipitation.
  • the battery 100 including the battery cell 20 provided by any of the above embodiments has better energy sealing and safety performance.
  • An embodiment of the present application also provides an electrical device, including the battery 100 provided in the above embodiment.
  • the embodiment of the present application provides a battery cell 20.
  • the battery cell 20 includes a casing and an electrode assembly 22.
  • the casing 21 has four side walls. The four side walls are connected in sequence to form a space for accommodating the electrode assembly 22. Two adjacent ones are The two side walls are transitionally connected through arc-shaped walls, thereby forming corner areas at the four corners of the housing 21, thereby making the internal space of the housing 21 deformed.
  • the electrode assembly 22 includes a first pole piece group 221 , a second pole piece 225 and a second pole piece group 226 .
  • the first pole piece group 221 includes a plurality of first pole pieces 2211 stacked along the first direction X1.
  • the second pole piece group 226 includes a plurality of third pole pieces 2261 stacked along the second direction X2.
  • the continuously arranged part of the first pole pieces 2211 in the first pole piece region 221a forms the first pole piece region 221a.
  • the length of the first positive electrode active material layer of the first pole piece 2211 in the first pole piece region 221a gradually increases along the first direction X1.
  • Large, the length of the first negative active material layer of the first pole piece 2211 in the first pole piece region 221a gradually increases along the first direction X1.
  • Another part of the continuously arranged first pole pieces 2211 in the first pole piece region 221a forms a second pole piece region 221b.
  • the first pole piece 2211 in the second pole piece region 221b is connected to the first positive electrode active layer 22112 in the first pole piece region 221a.
  • the first pole piece 2211 with the largest length is the same.
  • Second negative electrode active layers 2252 are provided on both opposite surfaces of the second current collector 2251 of the second pole piece 225 along the first direction X1.
  • the third pole piece 2261 group and the first pole piece group 221 are arranged symmetrically with respect to the second pole piece 225 .

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Abstract

本申请提供了一种电极组件、电池单体、电池及用电设备。电极组件包括第一极片组，第一极片组包括沿第一方向层叠设置的多个第一极片，第一极片包括第一集流体、第一正极活性层和第一负极活性层，第一正极活性层和第一负极活性层分别设置于第一集流体沿第一方向的两侧，相邻的两个第一极片中一者的第一负极活性层面向且覆盖另一者的第一正极活性层；第一极片组中连续设置的至少一部分第一极片形成第一极片区，第一极片区中的第一极片的第一正极活性层的长度沿第一方向逐渐增大，使得壳体的异形的内部空间能够被充分利用，使第一极片在壳体的晃动的可能性较小，能够降低析锂的风险，有利于提高具备该电极组件的电池单体和电池的能量密度和安全性能。

Description

电极组件、电池单体、电池及用电设备 技术领域
本申请涉及电池技术领域，具体而言，涉及一种电极组件、电池单体、电池及用电设备。
背景技术
目前，车辆使用较多的电池一般是锂离子电池，锂离子电池作为一种可再充电电池，具有体积小、功率密度高、循环使用次数多和存储时间长等优点。其中，电池的能量密度是影响电池性能的一个重要因素，因此，如何提高电池的能量密度成为电池技术领域亟待解决的问题。
发明内容
本申请实施例提供一种电极组件、电池单体、电池及用电设备，以提高电池的能量密度。
第一方面，本申请实施例提供一种电极组件，包括第一极片组，所述第一极片组包括沿第一方向层叠设置的多个第一极片，所述第一极片包括第一集流体、第一正极活性层和第一负极活性层，所述第一正极活性层和所述第一负极活性层分别设置于所述第一集流体沿所述第一方向的两侧，相邻的两个所述第一极片中一者的所述第一负极活性层面向且覆盖另一者的所述第一正极活性层；所述第一极片组中连续设置的至少一部分所述第一极片形成第一极片区，所述第一极片区中的所述第一极片的所述第一正极活性层的长度沿所述第一方向逐渐增大。
上述技术方案中，在第一极片区中的第一极片的第一正极活性层的长度沿第一方向逐渐增大，使得第一极片区的第一正极活性层的长度能够适应内部空间异形的壳体，使得壳体的异形的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。且相邻的两个第一极片中一者的第一负极活性层面向且覆盖另一者的第一正极活性层，能够降低析锂的风险，提高具备该电极组件的电池单体和电池的安全性能。由于第一极片充分利用了壳体内部异形的空间，在电池产生震动后，第一极片不容易晃动，以使相邻的第一极片之间能够保持稳定的层叠关系，进一步降低了因第一极片晃动使得相邻的第一极片之间在垂直第一方向的方向上错位而导致电极组件析锂的风险。
在本申请第一方面的一些实施例中，所述第一极片区中的所述第一极片的所述第一负极活性层的长度沿所述第一方向逐渐增大。
上述技术方案中，第一极片区中的第一极片的第一负极活性层的长度沿第一方向逐渐增大，则在第一极片区中，第一极片的第一负极活性层的长度沿第一方向的变化趋势与第一正极活性层的长度沿第一方向的变化趋势相同，以使第一极片区的各个第一极片的第一负极活性层的长度变化趋势适应第一正极活性层的长度的变化趋势，使得第一极片区的第一负极活性层的长度能够适应内部空间异形的壳体，使得壳体的异形的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述第一负极活性层的边缘超出所述第一正极活性层的边缘；或者，所述第一负极活性层的边缘与所述第一正极活性层的边缘平齐。
上述技术方案中，对每个第一极片而言，第一负极活性层的边缘超出第一正极活性层的边缘或者第一负极活性层的边缘与第一正极活性层的边缘平齐，能够降低析锂的风险，提高具备该电极组件的电池单体和电池的安全性能。
在本申请第一方面的一些实施例中，在所述第一极片区，相邻的两个所述第一正极活性层中的一者沿所述第一极片的长度方向的两端均超出另一者的两端；和/或，相邻的两个所述第一负极活性层中的一者沿所述第一极片的长度方向的两端均超出另一者的两端；所述第一极片的长度方向垂直所述第一方向。
上述技术方案中，相邻的两个第一正极活性层中的一者沿第一极片的长度方向的两端均超出另一者的两端，和/或，相邻的两个第一负极活性层中的一者沿第一极片的长度方向的两端均超出另一者的两端，使得第一极片区的第一正极活性层和/或第一负极活性层能够适应内部空间沿第一极片的长度方向两端均异形的壳体，使得壳体的异形的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，在所述第一极片区，相邻的两个所述第一正极活性层中一者沿所述第一极片的长度方向的一端与另一者沿所述第一极片的长度方向的一端平齐；和/或，相邻的两个所述第一负极活性层中一者沿所述第一极片的长度方向的一端与另一者沿所述第一极片的长度方向的一端平齐；所述第一极片的长度方向垂直所述第一方向。
上述技术方案中，相邻的两个第一正极活性层中一者沿第一极片的长度方向的一端与另一者沿第一极片的长度方向的一端平齐，和/或，相邻的两个第一负极活性层中一者沿第一极片的长度方向的一端与另一者沿第一极片的长度方向的一端平齐，使得第一极片区的第一正极活性层和/或第一负极活性层能够适应内部空间沿第一极片的长度方向一端异形、另一端规则的壳体，使得壳体的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述第一极片组中连续设置的至少一部分所述第一极片形成所述第一极片区，所述第一极片组中的另一部分所述第一极片形成第二极片区，在所述第一极片区中，所述第一正极活性层的长度最大和最小的所述第一极片分别为第一极片单元和第二极片单元；所述第二极片区设置于所述第一极片区的一侧，且所述第二极片区设置于所述第一极片单元背离所述第二极片单元的一侧，所述第二极片区中的所述第一极片与所述第一极片单元相同。
上述技术方案中，第二极片区中的第一极片与第一极片区中的第一正极活性层的长度最大的第一极片的 相同，使得该电极组件能够适应内部空间部分规整、另一部分异形的壳体，使得壳体的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述第二极片单元位于所述电极组件沿第二方向的一端，所述第一方向与所述第二方向相反。
上述技术方案中，在第一极片区，第二极片单元的第一正极活性层的长度最小且第二极片单元位于电极组件沿第二方向的一端，使得第一极片区的第一极片能够适应内部空间异形的壳体，使得壳体的异形的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述电极组件还包括第二极片，沿所述第一方向，所述第二极片设置于所述第一极片组的一侧，且与所述第一极片组中所述第一正极活性层长度最大的一者相邻设置；沿所述第二极片包括第二集流体和第二负极活性层，在所述第一方向，所述第二集流体至少面向所述第一极片的一侧设有所述第二负极活性层，所述第二集流体面向所述第一极片的一侧的所述第二负极活性层与其相邻的所述第一极片的所述第一正极活性层相对设置并覆盖所述第一正极活性层。
上述技术方案中，设置第二极片且第二极片面向第一极片的一侧的第二负极活性层与其相邻的第一极片的第一正极活性层相对设置并覆盖第一正极活性层，使得第一极片组中的每个第一极片的第一正极活性层均具有与之对应的负极活性层，从而使得从第一极片组中的每个第一极片的第一正极活性层中脱离的离子均能够被负极活性层承接，能够提高具备该电极组件的电池单体和电池的能量密度，还能降低析锂的风险。
在本申请第一方面的一些实施例中，沿所述第一方向，所述第二集流体两侧均设有所述第二负极活性层。
上述技术方案中，第二集流体沿第一方向的两侧均设有第二负极活性层，则第二极片沿第一方向的两侧均可以对应设置正极活性层，有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述电极组件还包括第二极片组，沿所述第一方向，所述第二极片组设置于所述第二极片背离所述第一极片组的一侧；所述第二极片组包括至少一个第三极片，所述第三极片包括第三集流体、第三正极活性层和第三负极活性层，在所述第一方向，所述第三正极活性层设置于所述第三集流体面向所述第二极片的一侧，所述第三负极活性层设置于所述第三集流体背离所述第二极片的一侧。
上述技术方案中，第二极片组的设置能够提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述第三负极活性层的边缘超出所述第三正极活性层的边缘；或者，所述第三负极活性层的边缘与所述第三正极活性层的边缘平齐。
上述技术方案中，对每个第三极片而言，第三负极活性层的边缘超出第三正极活性层的边缘或者第三负极活性层的边缘与第三正极活性层的边缘平齐，能够降低析锂的风险，提高具备该电极组件的电池单体和电池的安全性能。
在本申请第一方面的一些实施例中，所述第二极片组包括多个所述第三极片，多个所述第三极片沿第二方向排布，所述第二方向与所述第一方向相反。
上述技术方案中，第二极片组包括多个第三极片，使得具备该电极组件的电池单体和电池能够具有更高的能量密度。
在本申请第一方面的一些实施例中，所述第一极片组和所述第二极片组关于所述第二极片对称设置。
上述技术方案中，第一极片组和第二极片组关于第二极片对称设置，使得第二极片组的第三正极活性层的长度能够适应内部空间异形的壳体，且该电极组件能够适应内部空间沿第一方向的两侧异形的壳体，使得壳体的异形的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
在本申请第一方面的一些实施例中，所述第二负极活性层沿所述第三极片的长度方向的两端和所述第三负极活性层沿所述第三极片的长度方向的两端平齐，所述第三极片的长度方向与所述第一方向垂直。
上述技术方案中，第二负极活性层沿第三极片的长度方向的两端和第三负极活性层沿第三极片的长度方向的两端平齐，使得第三负极活性层的长度足够大，能够降低析锂的风险，提高具备该电极组件的电池单体和电池的安全性能。
第二方面，本申请实施例提供一种电池单体，包括第一方面实施提供的电极组件。
上述技术方案中，第一方面实施例中提供的电极组件，能够适应异形的空间且析锂的风险较低，将电极组件容纳于内部为异形空间的壳体内能够充分利用壳体的异形的内部空间，从而有利于提高具备该电极组件的电池单体的能量密度和安全性能。
第三方面，本申请实施例提供一种电池，包括箱体和第二方面实施例提供的电池单体；所述电池单体容纳于所述箱体内。
上述技术方案中，第二方面实施例提供的电池单体能量密度较高和析锂的风险较低，包括第二方面实施例提供的电池单体的电池的能量密封和安全性能均较好。
第四方面，本申请实施例提供一种用电设备，包括第三方面实施例提供的电池。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为现有技术中的一种异形电池的结构示意图；
图2为本申请一些实施例提供的车辆的结构示意图；
图3为本申请一些实施例提供的电池的结构示意图；
图4为本申请一些实施例提供的电池单体的结构示意图；
图5为本申请一些实施例提供的电池单体的爆炸图；
图6为本申请的一些实施例提供的电池单体的结构示意图；
图7为本申请一些实施例提供的第一极片的结构示意图；
图8为本申请另一些实施例提供的第一极片的结构示意图；
图9为本申请的另一些实施例提供的电池单体的结构示意图；
图10为本申请再一些实施例提供的电池单体的结构示意图；
图11为本申请又一些实施例提供的电池单体的结构示意图；
图12为本申请的又一些实施例提供的电池单体的结构示意图；
图13为本申请的再另一些实施例提供的电池单体的结构示意图；
图14为本申请再另一些实施例提供的电池单体的结构示意图(第二极片两侧具有第二负极活性层)；
图15为本申请一些实施例提供的电极组件的结构示意图；
图16为本申请实施例提供的包括图15中的电极组件的电池单体的结构示意图；
图17为本申请又一些实施例提供的电极组件的结构示意图；
图18为本申请实施例提供的包括图16中的电极组件的电池单体的结构示意图；
图19为本申请另一些实施例提供的电极组件的结构示意图；
图20为本申请实施例提供的包括图19中的电极组件的电池单体的结构示意图；
图21为本申请另一些实施例提供的电池单体的结构示意图；
图22为本申请一些实施例提供的第三极片的结构示意图；
图23为本申请另一些实施例提供的第四极片的结构示意图；
图24为本申请再另一些实施例提供的电池单体的结构示意图；
图25为本申请再又一些实施例提供的电池单体的结构示意图；
图26为本申请又另一些实施例提供的电池单体的结构示意图；
图27为本申请又再一些实施例提供的电池单体的结构示意图。
图标：1000-车辆；100-电池；10-箱体；11-第一部分；12-第二部分；20'、20-电池单体；21'、21-壳体；211-开口；212-第一壁；213-第二壁；214-第三壁；215-第四壁；216-第一过渡壁；217-第二过渡壁；218-弧形壁；22'、22-电极组件；2-正极片；2a-正极集流体；2b-正极活性层；3-负极片；3a-负极集流体；3b-负极活性层；221-第一极片组；221a-第一极片区；221b-第二极片区；2211-第一极片；2211a-第一极片单元；2211b-第二极片单元；22111-第一集流体；22112-第一正极活性层；22113-第一负极活性层；2212-第一端部极片；22121-第一端部集流体；22122-第一端部正极活性层；4、222-隔离膜；223-正极耳；224-负极耳；225-第二极片；2251-第二集流体；2252-第二负极活性层；226-第二极片组；226a-第三极片区；226b-第四极片区；2261-第三极片；2261a-第三极片单元；2261b-第四极片单元；22611-第三集流体；22612-第三正极活性层；22613-第三负极活性层；2262-第二端部极片；22621-第二端部集流体；22622-第二端部正极活性层；23-端盖；24-电极端子；24a-正极电极端子；24b-负极电极端子；25-泄压机构；200-控制器；300-马达；X1-第一方向；Y-第一极片的长度方向；Z-第一极片的宽度方向；X2-第二方向；A'、A-拐角区。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请实施例的描述中，需要说明的是，指示方位或位置关系为基于附图所示的方位或位置关系，或者是该申请产品使用时惯常摆放的方位或位置关系，或者是本领域技术人员惯常理解的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电 池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方体方形电池单体和软包电池单体，本申请实施例对此也不限定。
如图1所示，电池单体20'包括壳体21'、电极组件22'和电解液，电解液和电极组件22'均容纳于壳体21'内。电极组件22'由正极片2、负极片3和隔离膜4组成。电池单体20'主要依靠金属离子在正极片2和负极片3之间移动来工作。正极片2包括正极集流体2a和正极活性层2b，正极活性层2b涂覆于正极集流体2a的表面，未涂敷正极活性层2b的正极集流体2a凸出于已涂覆正极活性层2b的正极集流体2a，未涂敷正极活性层2b的正极集流体2a作为正极耳。以锂离子电池为例，正极集流体2a的材料可以为铝，正极活性层2b可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片3包括负极集流体3a和负极活性层3b，负极活性层3b涂覆于负极集流体3a的表面，未涂敷负极活性层3b的负极集流体3a凸出于已涂覆负极活性层3b的负极集流体3a，未涂敷负极活性层3b的负极集流体3a作为负极耳。负极集流体3a的材料可以为铜，负极活性层3b可以为碳或硅等。为了保证通过大电流而不发生熔断，正极耳的数量为多个且层叠在一起，负极耳的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。电极组件22'包括卷绕式电极组件和叠片式电极组件。其中，叠片式电极组件为正极片2、负极片3和隔离膜4沿第一方向X1交替层叠设置形成。
电池技术的发展要同时考虑多方面的设计因素，例如，电池的安全性、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的能量密度。
发明人发现，现有的正极片包括正极集流体和涂覆在正极集流体的厚度方向的两表面的正极活性层，负极片包括负极集流体和涂覆在负极集流体的厚度方向的两表面的负极活性层。对叠片式电极组件而言，在内部空间异形的壳体内或者壳体内部空间异形的区域，为了适应异形空间，正极片和负极片的长度需要变化，比如，如图1所示，壳体21'内部空间的异形区域包括壳体21'的拐角区A'，在异形区域，沿第一方向X1，越背离壳体21'的中部，拐角区A'在正极片2的长度方向的尺寸越小，沿背离壳体21'的中部的方向，对应设置的极片的长度也逐渐减小，以避免极片和壳体21'的拐角干涉以损伤极片，如图1所示，在拐角区A'，正极片2的背离壳体21'的中部的一侧的负极片3的长度应小于该正极片2，但是这会导致析锂的问题产生。为了降低析锂的风险，需要将拐角区的负极片3面向壳体中部的正极片2的长度进一步减小，但是这导致正极片2没有充分利用拐角区A'的空间，使得壳体21'的内部空间没有被充分利用，降低了电池单体20'的能量密度。此外，由于在异形区域，正极片2和负极片3未充分利用了壳体内部异形区域，在电池产生震动后，正极片2和负极片3容易晃动，以使相邻的正极片2和负极片3在垂直第一方向X1的方向上晃动，使得相邻的第正极片2和负极片3之间在垂直第一方向的方向上错位，从而导致电极组件析锂。
基于上述考虑，为了缓解电池单体能量密度低的问题，发明人经过深入研究，设计了一种电极组件，电极组件包括第一极片组，第一极片组包括沿第一方向层叠设置的多个第一极片，第一极片包括第一集流体、第一正极活性层和第一负极活性层，第一正极活性层22112和第一负极活性层分别设置于第一集流体沿第一方向的两侧，相邻的两个第一极片中一者的第一负极活性层面向且覆盖另一者的第一正极活性层；第一极片组中连续设置的至少一部分第一极片形成第一极片区，第一极片区中的第一极片的第一正极活性层的长度沿第一方向逐渐增大。
在第一极片区中的第一极片的第一正极活性层的长度沿第一方向逐渐增大，使得第一极片区的第一正极活性层的长度能够适应内部空间异形的壳体，使得壳体的异形的内部空间能够被充利用，从而有利于提高具备该电极组件的电池单体和电池的能量密度。
且相邻的两个第一极片中一者的第一负极活性层面向且覆盖另一者的第一正极活性层，能够降低析锂的风险，提高具备该电极组件的电池单体和电池的安全性能。
由于第一极片充分利用了壳体内部异形的壳体，在电池产生震动后，第一极片不容易晃动，以使相邻的第一极片之间能够保持稳定的层叠关系，进一步降低了因第一极片晃动使得相邻的第一极片之间在垂直第一方向的方向上错位而导致电极组件析锂的风险。
本申请实施例公开的具备本申请实施例提供的电极组件的电池单体可以但不限用于车辆、船舶或飞行器等用电设备中，还可以使用具备本申请公开电极组件的电池单体、电池等组成该用电设备的电源系统，这样，有利于提高电池单体和电池的能量密度。
本申请实施例提供一种使用电池作为电源的用电设备，用电设备可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电设备为车辆1000为例进行说明。
请参照图2，车辆1000可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图3，电池100包括箱体10和电池单体20，电池单体20容纳于箱体10内。其中，箱体10用于为电池单体20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一部分11和第二部分12，第一部分11与第二部分12相互盖合，第一部分11和第二部分12共同限定出用于容纳电池单体20的容 纳空间。第二部分12可以为一端开口以形成容纳电池单体20的容纳腔的空心结构，第一部分11可以为板状结构，第一部分11盖合于第二部分12的开口侧，以使第一部分11与第二部分12共同限定出容纳空间；第一部分11和第二部分12也可以是均为一侧开口的以形成容纳电池单体20的容纳腔的空心结构，第一部分11的开口侧盖合于第二部分12的开口侧。当然，第一部分11和第二部分12形成的箱体10可以是多种形状，比如，圆柱体、长方体等。
在电池100中，电池单体20可以是多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内；当然，电池100也可以是多个电池单体20先串联或并联或混联组成电池模块形式，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体10内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体20之间的电连接。
在一些实施例中，电池100还可以包括汇流部件(图未示出)，多个电池单体20之间可通过汇流部件实现电连接，以实现多个电池单体20的串联或并联或混联。
其中，每个电池单体20可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。电池单体20可扁平体、长方体或其它形状等。
请参照图4、图5，电池单体20可以包括壳体21、电极组件22和端盖23。壳体21具有开口211，电极组件22容纳于壳体21内，端盖23用于封盖于开口211。
壳体21可以是多种形状，比如椭圆结构、梯形结构、六棱柱等。电极组件22的轮廓可以根据壳体21的结构形状相适配。比如，若壳体21为梯形结构，电极组件22可以为梯形结构；若壳体21为椭圆形，则电极组件22的轮廓可以壳体21的轮廓适配。
壳体21的材质也可以是多种，比如，铜、铁、铝、不锈钢、铝合金等，本申请实施例对此不作特殊限制。
端盖23是指盖合于壳体21的开口211处以将电池单体20的内部环境隔绝于外部环境的部件。不限地，端盖23的形状可以与壳体21的形状相适应以配合壳体21。可选地，端盖23可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖23在受挤压碰撞时就不易发生形变，使电池单体20能够具备更高的结构强度，安全性能也可以有所提高。端盖23用于封盖壳体21的开口211，以形成一密闭的安装空间(图未示出)，安装空间用于容纳电极组件22。安装空间还用于容纳电解质，例如电解液。
端盖23上还设有输出电极组件22的电能的电极端子24，电极端子24用于与电极组件22电连接，即电极端子24与电极组件22的极耳(图中未示出)电连接，比如，电极端子24与极耳通过集流构件(图中未示出)连接，以实现电极端子24与极耳的电连接。
需要说明的，壳体21的开口211可以是一个，也可以是两个。若壳体21的开口211为一个，端盖23也可以为一个，端盖23中则可设置两个电极端子24，两个电极端子24分别为正极电极端子24a和负极电极端子24b，正极电极端子24a和负极电极端子24b分别用于与电极组件22正极耳223和负极耳224电连接，端盖23中的两个电极端子24分别为正极电极端子24a和负极电极端子24b。若壳体21的开口211为两个，比如，两个开口211设置在壳体21相对的两侧，端盖23也可以为两个，两个端盖23分别盖合于21的两个开口211处。在这种情况下，可以是一个端盖23中的电极端子24为正极电极端子24a，用于与电极组件22的正极耳223电连接；另一个端盖23中的电极端子24为负极电极端子24b，用于与电极组件22的负极耳224电连接。
端盖23的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
壳体21和端盖23可以是独立的部件，可以于壳体21上设置开口211，通过在开口211处使端盖23盖合开口211以形成电池单体20的内部环境。不限地，也可以使端盖23和壳体21一体化，具体地，端盖23和壳体21可以在其他部件入壳前先形成一个共同的连接面，当需要封装壳体21的内部时，再使端盖23盖合壳体21。
端盖23上还可以设置泄压机构25，泄压机构25用于在电池单体20内部的压力或者温度达到阈值时泄放电池单体20内部的压力。泄压机构25可以采用诸如防爆阀、防爆片、气阀、泄压阀、安全阀、形成于端盖23上的薄弱部等的形式。
如图6所示，在一些实施例中，电极组件22包括第一极片组221，第一极片组221包括沿第一方向X1层叠设置的多个第一极片2211，第一极片2211包括第一集流体22111、第一正极活性层22112和第一负极活性层22113，第一正极活性层22112和第一负极活性层22113分别设置于第一集流体22111沿第一方向X1的两侧，相邻的两个第一极片2211中一者的第一负极活性层22113面向且覆盖另一者的第一正极活性层22112；第一极片组221中连续设置的至少一部分第一极片2211形成第一极片区221a，第一极片区221a中的第一极片2211的第一正极活性层22112的长度沿第一方向X1逐渐增大。
相邻的两个第一极片2211之间设置一个隔离膜222，用于绝缘隔离相邻的两个第一极片2211。
本申请中出现的“多个”指的是两个以上(包括两个)。在本实施例中，第一极片区221a包括两个及两个以上的第一极片2211。
第一方向X1为单向，第一方向X1与第一集流体22111的厚度方向平行。
第一集流体22111的材质可以包括铝、铜等中的至少一种。沿第一方向X1，第一集流体22111具有相对的第一表面和第二表面，第一正极活性层22112设置于第一表面，第一负极活性层22113设置于第二表面。
“相邻的两个第一极片2211中一者的第一负极活性层22113面向且覆盖另一者的第一正极活性层22112”，是指相邻的两个第一极片2211中的一者的第一正极活性层22112在另一者的第一负极活性层22113上的投影位于该第一负极活性层22113内或者相邻的两个第一极片2211中的一者的第一正极活性层22112在另一者的第一负极活性层22113上的投影的轮廓与该第一负极活性层22113的轮廓重合。
“第一正极活性层22112的长度”，是指第一正极活性层22112沿第一极片的长度方向Y的尺寸。第一极片的长度方向Y垂直第一方向X1。
在第一极片区221a中的第一极片2211的第一正极活性层22112的长度沿第一方向X1逐渐增大，使得第一极片区221a的第一正极活性层22112的长度能够适应内部空间异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。且相邻的两个第一极片2211中一者的第一负极活性层22113面向且覆盖另一者的第一正极活性层22112，能够降低析锂的风险，提高具备该电极组件22的电池单体20和电池100的安全性能。由于第一极片2211充分利用了壳体21内部异形的空间，在电池产生震动后，第一极片2211不容易晃动，以使相邻的第一极片2211之间能够保持稳定的层叠关系，进一步降低了因第一极片2211晃动使得相邻的第一极片2211之间在垂直第一方向X1的方向上错位而导致电极组件22析锂的风险。
壳体21的内部空间异形可以是由于壳体21的各个壁的形状和/或尺寸不同而导致的，比如，在图6中，壳体21包括沿第一方向X1相对的第一壁212和第二壁213以及沿第一极片的长度方向Y相对的第三壁214和第四壁215，第一壁212和第二壁213的沿第一极片的长度方向Y的尺寸不同，且第二壁213沿第一极片的长度方向Y的两端均超出第一壁212沿第一极片的长度方向Y的两端，第三壁214连接于第一壁212沿第一极片的长度方向Y的一端和第二壁213沿第一极片的长度方向Y的一端之间，第三壁214分别和第一壁212和第二壁213呈钝角和锐角布置；第四壁215接于第一壁212沿第一极片的长度方向Y的另一端和第二壁213沿第一极片的长度方向Y的另一端之间，第四壁215分别和第一壁212和第二壁213呈钝角和锐角布置，从而使得两个第一壁212和两个第二壁213共同围城异形的内部空间。
在一些实施例中，第一极片区221a中的第一极片2211的第一负极活性层22113的长度沿第一方向X1逐渐增大。
“第一负极活性层22113的长度”，是指第一负极活性层22113沿第一极片的长度方向Y的尺寸。
若第一正极活性层22112的长度越大，面向并覆盖该第一正极活性层22112的第一负极活性层22113的长度也对应越大，以降低电极组件22析锂的风险。反之，若第一正极活性层22112的长度越小，面向并覆盖该第一正极活性层22112的第一负极活性层22113的长度也对应越小，既降低析锂的风险，又避免活性材料浪费。
在第一极片区221a中，第一极片2211的第一负极活性层22113的长度沿第一方向X1逐渐增大，使得在第一极片区221a中，长度越大的第一正极活性层22112对应的第一负极活性层22113的长度也越大。
第一极片区221a中的第一极片2211的第一负极活性层22113的长度沿第一方向X1逐渐增大，则在第一极片区221a中，第一极片2211的第一负极活性层22113的长度沿第一方向X1的变化趋势与第一正极活性层22112的长度沿第一方向X1的变化趋势相同，以使第一极片区221a的各个第一极片2211的第一负极活性层22113的长度变化趋势适应第一正极活性层22112的长度的变化趋势，使得第一极片区221a的第一负极活性层22113的长度能够适应内部空间异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度；还能避免活性材料浪费。
在另一些实施例中，在第一极片区221a中，各个第一极片2211的第一负极活性层22113的长度也可以相同，各个第一负极活性层22113的长度与面向并覆盖长度最大的第一正极活性层22112的第一负极活性层22113的长度相同。
如图7、图8所示，在一些实施例中，第一负极活性层22113的边缘超出第一正极活性层22112的边缘；或者，第一负极活性层22113的边缘与第一正极活性层22112的边缘平齐。
对第一极片2211而言，“第一负极活性层22113的边缘超出第一正极活性层22112的边缘”可以是第一负极活性层22113的部分边缘超出第一正极活性层22112的边缘，第一负极活性层22113的另一部分边缘与第一正极活性层22112的边缘平齐。比如，第一负极活性层22113沿第一极片的长度方向Y的两个边缘超出第一正极活性层22112沿第一极片的长度方向Y的两个边缘，第一负极活性层22113沿第一极片的宽度方向Z的两个边缘与第一正极活性层22112沿第一极片的宽度方向Z的两个边缘平齐。第一方向X1、第一极片的长度方向Y和第一极片的宽度方向Z两两垂直。
“第一负极活性层22113的边缘超出第一正极活性层22112的边缘”可以是第一负极活性层22113的全部边缘均超出第一正极活性层22112的边缘，即第一负极活性层22113沿第一极片的长度方向Y的两个边缘超出第一正极活性层22112沿第一极片的长度方向Y的两个边缘，第一负极活性层22113沿第一极片的宽度方向Z的两个边缘超出第一正极活性层22112沿第一极片的宽度方向Z的两个边缘。
对第一极片2211而言，“第一负极活性层22113的边缘与第一正极活性层22112的边缘平齐”，是指第一负极活性层22113的全部边缘与第一正极活性层22112的全部边缘平齐，即第一负极活性层22113沿第一极片的长度方向Y的两个边缘与第一正极活性层22112沿第一极片的长度方向Y的两个边缘平齐，第一负极活性层22113沿第一极片的宽度方向Z的两个边缘与第一正极活性层22112沿第一极片的宽度方向Z的两个边缘平齐。
对每个第一极片2211而言，第一负极活性层22113的边缘超出第一正极活性层22112的边缘或者第一负极活性层22113的边缘与第一正极活性层22112的边缘平齐，能够降低析锂的风险，提高具备该电极组件22的电池单体20和电池100的安全性能。
在另一些实施例中，第一极片2211的第一正极活性层22112的边缘也可以超出第一负极活性层22113的边缘，只要满足第一负极活性层22113能够覆盖其面向的第一正极活性层22112即可。
如图6所示，在一些实施例中，在第一极片区221a，相邻的两个第一正极活性层22112中的一者沿第一极片的长度方向Y的两端均超出另一者的两端；和/或，相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端均超出另一者的两端；第一极片的长度方向Y垂直第一方向X1。
在相邻的两个第一正极活性层22112中的一者沿第一极片的长度方向Y的两端均超出另一者的两端的实施例中，相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端可以均超出另一者的两端；或者相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的一端与另一者的一端平齐，相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的另一端超出另一者的另一端；或者相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端与另一者的两端平齐。
在相邻的两个第一正极活性层22112中的一者沿第一极片的长度方向Y的两端均超出另一者的两端的实施例中，相邻的两个第一正极活性层22112中的一者沿第一极片的宽度方向Z的两端可以均超出另一者沿第一极片的宽度方向Z的两端；或者相邻的两个第一正极活性层22112中的一者沿第一极片的宽度方向Z的两端可以与另一者沿第一极片的宽度方向Z的两端平齐；或者相邻的两个第一正极活性层22112中的一者沿第一极片的宽度方向Z的一端与另一者沿第一极片的宽度方向Z的一端平齐，相邻的两个第一正极活性层22112中的一者沿第一极片的宽度方向Z的另一端超出另一者沿第一极片的宽度方向Z的另一端。
相邻的两个第一正极活性层22112中的一者沿第一极片的长度方向Y的两端均超出另一者的两端，和/或，相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端均超出另一者的两端，使得第一极片区221a的第一正极活性层22112和/或第一负极活性层22113能够适应内部空间沿第一极片的长度方向Y两端均异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
如图9所示，在另一些实施例中，在第一极片区221a，相邻的两个第一正极活性层22112中一者沿第一极片的长度方向Y的一端与另一者沿第一极片的长度方向Y的一端平齐；和/或，相邻的两个第一负极活性层22113中一者沿第一极片的长度方向Y的一端与另一者沿第一极片的长度方向Y的一端平齐；第一极片的长度方向Y垂直第一方向X1。
在第一极片区221a，沿第一方向X1，第一极片2211的第一正极活性层22112的长度逐渐增大，在邻的两个第一正极活性层22112中一者沿第一极片的长度方向Y的一端与另一者沿第一极片的长度方向Y的一端平齐的情况下，相邻的两个第一正极活性层22112中一者沿第一极片的长度方向Y的另一端超出另一者沿第一极片的长度方向Y的另一端。
在相邻的两个第一正极活性层22112中一者沿第一极片的长度方向Y的一端与另一者沿第一极片的长度方向Y的一端平齐的实施例中，相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端可以均超出另一者的两端；或者相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的一端与另一者的一端平齐，相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的另一端超出另一者的另一端；或者相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端与另一者的两端平齐。
相邻的两个第一正极活性层22112中一者沿第一极片的长度方向Y的一端与另一者沿第一极片的长度方向Y的一端平齐，和/或，相邻的两个第一负极活性层22113中一者沿第一极片的长度方向Y的一端与另一者沿第一极片的长度方向Y的一端平齐，使得第一极片区221a的第一正极活性层22112和/或第一负极活性层22113能够适应内部空间沿第一极片的长度方向Y一端异形、另一端规则的壳体21，使得壳体21的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
在图9中，壳体21可以具有沿第一方向X1相对的第一壁212和第二壁213以及沿第一极片的长度方向Y相对的第三壁214和第四壁215，第一壁212和第二壁213沿第一极片的长度方向Y的一端对齐，并通过第三壁214连接。第二壁213沿第一极片的长度方向Y的另一端超出第一壁212沿第一极片的长度方向Y的另一端，并通过第四壁215连接，第四壁215相对第一壁212和第二壁213分别呈钝角和锐角布置，从而第一壁212、第二壁213、第三壁214和第四壁215共同形成异形的内部空间。
如图6和图9所示，第一极片组221中可以是所有第一极片2211的第一正极活性层22112的长度沿第一方向X1逐渐增大，则第一极片区221a即第一极片组221件。
如图10所示，在一些实施例中，第一极片组221中连续设置的至少一部分第一极片2211形成第一极片区221a，第一极片组221中的另一部分第一极片2211形成第二极片区221b，在第一极片区221a中，第一正极活性层22112的长度最大和最小的第一极片2211分别为第一极片单元2211a和第二极片单元2211b；第二极片区221b设置于第一极片区221a的一侧，且第二极片区221b设置于第一极片单元2211a背离第二极片单元2211b的一侧，第二极片区221b中的第一极片2211与第一极片单元2211a相同。
“第二极片区221b中的第一极片2211和第一极片单元2211a相同”，包括第二极片区221b中的第一极片2211的第一正极活性物质层的长度和第一极片单元2211a的第一正极活性层22112的长度相同，第二极片区221b中的第一极片2211的第一负极活性物质层的长度和第一极片单元2211a的第一负极活性层22113的长度相同。第二极片区221b的第一极片2211的第一负极活性层22113面向第一极片单元2211a设置。
第二极片区221b中的第一极片2211的数量可以是一个，也可以是多个。
第二极片区221b中的第一极片2211与第一极片区221a中的第一正极活性层22112的长度最大的第一极片2211的相同，使得该电极组件22能够适应内部空间部分规整、另一部分异形的壳体21，使得壳体21的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
壳体21异形的内部空间也可以是以其他方式形成，比如，在图10中，壳体21具有沿第一方向X1相对的第一壁212和第二壁213以及沿第一极片的长度方向Y相对的第三壁214和第四壁215，第一壁212沿第一极片的长度方向Y的尺寸小于第二壁213沿第一极片的长度方向Y的尺寸，且第二壁213沿第一极片的长度方向Y的两端均超出第一壁212沿第一极片的长度方向Y的两端。第三壁214和第四壁215分别连接于第二壁213沿第一极片的长度方向Y的两端并向靠近第一壁212的方向延伸，第三壁214和第四壁215均垂直第二壁213。壳体21还包 括第一过渡壁216和第二过渡壁217，第一过渡壁216连接于第三壁214背离第二壁213的一端与第一壁212沿第一极片的长度方向Y的一端之间，第一壁212和第三壁214均与第一过渡壁216之间呈钝角布置；第二过渡壁217连接于第四壁215背离第二壁213的一端与第一壁212沿第一极片的长度方向Y的另一端之间，第一壁212和第四壁215均与第二过渡壁217之间呈钝角布置，从而第一壁212、第二壁213、第三壁214、第四壁215、第一过渡壁216和第二过渡壁217共同形成异形的内部空间。
在一些实施例中，第二极片单元2211b位于电极组件22沿第二方向X2的一端，第一方向X1与第二方向X2相反。
第二极片单元2211b位于电极组件22沿第二方向X2的一端，可以理解为，第二极片单元2211b背离第一极片单元2211a的一侧没有其他极片。
在第一极片区221a，第二极片单元2211b的第一正极活性层22112的长度最小且第二极片单元2211b位于电极组件22沿第二方向X2的一端，使得第一极片区221a的第一极片2211能够适应内部空间异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
由于第二极片单元2211b的第一负极活性层22113设置于第二极片单元2211b的第一集流体22111的背离第一极片单元2211a的一侧，若第二极片单元2211b的第一负极活性层22113背离第一极片单元2211a的一侧未设置极片，则导致第二极片单元2211b的第一负极活性层22113被浪费，因此，如图11、图12所示，在一些实施例中，第一极片组221还包括第一端部极片2212，第一端部极片2212设置于第二极片单元2211b背离第一极片单元2211a的一侧。第一端部极片2212包括第一端部集流体22121和设置于第一端部集流体22121面向第二极片单元2211b的一侧的第一端部正极活性层22122，第二极片单元2211b的第一负极活性层22113面向并覆盖第一端部极片2212的第一端部正极活性层22122。第一端部集流体22121背离第二极片单元2211b的一侧可以不设置活性层。
如图12、图13所示，在一些实施例中，电极组件22还包括第二极片225，沿第一方向X1，第二极片225设置于第一极片组221的一侧，且与第一极片组221中第一正极活性层22112长度最大的一者相邻设置；沿第二极片225包括第二集流体2251和第二负极活性层2252，在第一方向X1，第二集流体2251至少面向第一极片2211的一侧设有第二负极活性层2252，第二集流体2251面向第一极片2211的一侧的第二负极活性层2252与其相邻的第一极片2211的第一正极活性层22112相对设置并覆盖第一正极活性层22112。
沿第一方向X1，第二集流体2251具有相对的第三表面和第四表面，第三表面面向第一极片区221a设置，至少第三表面设有第二负极活性层2252。
如图12所示，在第一极片区221a即第一极片组221的实施例中，第二极片225与第一极片单元2211a相邻设置，第二集流体2251面向第一极片组221的一侧的第二负极活性层2252面向并覆盖第一极片单元2211a的第一正极活性层22112设置。
如图13所示，在第一极片组221包括第一极片区221a和第二极片区221b的实施例中，第二极片225与第二极片区221b中最远离第一极片区221a的第一极片2211相邻设置，第二集流体2251面向第一极片组221的一侧的第二负极活性层2252面向并覆盖该第一极片2211的第一正极活性层22112。
设置第二极片225且第二极片225面向第一极片2211的一侧的第二负极活性层2252与其相邻的第一极片2211的第一正极活性层22112相对设置并覆盖第一正极活性层22112，使得第一极片组221中的每个第一极片2211的第一正极活性层22112均具有与之对应的负极活性层，从而使得从第一极片组221中的每个第一极片2211的第一正极活性层22112中脱离的离子均能够被负极活性层承接，能够提高具备该电极组件22的电池单体20和电池100的能量密度，还能降低析锂的风险。
第二集流体2251可以仅面向第一极片组221的表面设有第二负极活性层2252，即仅第三表面设有第二负极活性层2252(如图12、图13所示)。如图14所示，在另一些实施例中，沿第一方向X1，第二集流体2251两侧均设有第二负极活性层2252。即，第三表面和第四表面均设有第二负极活性层2252。
第二集流体2251沿第一方向X1的两侧均设有第二负极活性层2252，则第二极片225沿第一方向X1的两侧均可以对应设置正极活性层，有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
如图14所示，壳体21可以具有沿第一方向X1相对的第一壁212和第二壁213以及沿第一极片的长度方向Y相对的第三壁214和第四壁215，第一壁212和第二壁213沿第一极片的长度方向Y的一端对齐，并通过第三壁214连接。第二壁213沿第一极片的长度方向Y的另一端超出第一壁212沿第一极片的长度方向Y的另一端，第四壁215与第二壁213垂直并连接于第二壁213背离第三壁214的一端，第四壁215沿第一方向X1的尺寸小于第三壁214沿第一方向的尺寸。壳体21还包括第二过渡壁217，第二过渡壁217连接于第一壁212背离第三壁214的一端和第四壁215背离第二壁213的一端之间，第二过渡壁217相对第一壁212和第四壁215均呈钝角布置，从而第一壁212、第二壁213、第三壁214、第四壁215和第二过渡壁217共同形成异形的内部空间。
在电极组件22仅包括第一极片组221的实施例中，相邻的两个第一极片2211中一者的第一正极活性层22112和另一者的第一负极活性层22113相对设置，且多个第一极片2211的第一正极活性层22112和第一负极活性层22113在第一方向X1上交替布置，以实现内部串联的电极组件22。沿第一方向X1，多个第一极片2211中位于电极组件22的两端的两个第一极片2211的第一集流体22111分别设有正极耳223和负极耳224。正极耳223和负极耳224沿第一极片的宽度方向Z延伸出第一集流体22111。其中，如图15、图16所示，正极耳223和负极耳224可以位于电极组件22的沿第一极片的宽度方向Z的同侧，则正极电极端子24a和负极电极端子24b设置于同一个端盖23上。如图17、图18所示，正极耳223和负极耳224可以位于电极组件22的沿第一极片的宽度方向Z的两侧，则正极电极端子24a和负极电极端子24b沿第一方向X1相对设置。
在电极组件22仅包括第一极片组221和第二极片225的实施例中，第二极片225的第二集流体2251在 第二极片225的宽度方向的一侧形成有负极耳224，第一极片组221件中最远离第二极片225的一者(第二极片单元2211b或者第一端部极片2212)的集流体在第二极片225的宽度方向的一侧设有正极耳223。图19、图20中示出了第一极片组221中最远离第二极片225的是第一端部极片2212，第一端部极片2212的第一端部集流体22121沿第一极片的宽度方向Z的一侧形成有正极耳223。在这种情况下，正极耳223和负极耳224可以设置于电极组件22的同侧，也可以设置于电极组件22相对的两侧(如图21所示)。第二极片225的宽度方向与第一极片的宽度方向Z平行，第二极片225的长度方向与第一极片的长度方向Y平行。
在第二集流体2251沿第一方向X1的两侧均设有第二负极活性层2252的实施例中，请继续参照图14，电极组件22还包括第二极片组226，沿第一方向X1，第二极片组226设置于第二极片225背离第一极片组221的一侧；第二极片组226包括至少一个第三极片2261，第三极片2261包括第三集流体22611、第三正极活性层22612和第三负极活性层22613，在第一方向X1，第三正极活性层22612设置于第三集流体22611面向第二极片225的一侧，第三负极活性层22613设置于第三集流体22611背离第二极片225的一侧。
第二极片225的面向第三极片2261的第二负极活性层2252覆盖与之相邻的第三极片2261的第三正极活性层22612。
第二极片组226的设置能够提高具备该电极组件22的电池单体20和电池100的能量密度。
如图22、图23所示，在一些实施例中，第三负极活性层22613的边缘超出第三正极活性层22612的边缘；或者，第三负极活性层22613的边缘与第三正极活性层22612的边缘平齐。
对第三极片2261而言，“第三负极活性层22613的边缘超出第三正极活性层22612的边缘”可以是第三负极活性层22613的部分边缘超出第三正极活性层22612的边缘，第三负极活性层22613的另一部分边缘与第三正极活性层22612的边缘平齐。比如，第三负极活性层22613沿第三极片2261的长度方向的两个边缘超出第三正极活性层22612沿第三极片2261的长度方向的两个边缘，第三负极活性层22613沿第三极片2261的宽度方向的两个边缘与第三正极活性层22612沿第三极片2261的宽度方向的两个边缘平齐。第三极片2261的长度方向与第一极片的长度方向Y平行，第三极片2261的宽度方向与第一极片的宽度方向Z平行。
“第三负极活性层22613的边缘超出第三正极活性层22612的边缘”可以是第三负极活性层22613的全部边缘均超出第三正极活性层22612的边缘，即第三负极活性层22613沿第三极片2261的长度方向的两个边缘超出第三正极活性层22612沿第一极片的长度方向Y的两个边缘，第三负极活性层22613沿第三极片2261的宽度方向的两个边缘超出第三正极活性层22612沿第三极片2261的宽度方向的两个边缘。
对第三极片2261而言，“第三负极活性层22613的边缘与第三正极活性层22612的边缘平齐”，是指第三负极活性层22613的全部边缘与第三正极活性层22612的全部边缘平齐，即第三负极活性层22613沿第三极片2261的长度方向的两个边缘与第三正极活性层22612沿第三极片2261的长度方向的两个边缘平齐，第三负极活性层22613沿第三极片2261的宽度方向的两个边缘与第三正极活性层22612沿第三极片2261的宽度方向的两个边缘平齐。
对每个第三极片2261而言，第三负极活性层22613的边缘超出第三正极活性层22612的边缘或者第三负极活性层22613的边缘与第三正极活性层22612的边缘平齐，能够降低析锂的风险，提高具备该电极组件22的电池单体20和电池100的安全性能。
第三极片2261的数量可以是一个，也可以是多个。在一些实施例中，第二极片组226包括多个第三极片2261，多个第三极片2261沿第二方向X2排布，第二方向X2与第一方向X1相反。
相邻的两个第三极片2261中的一者的第三负极活性层22613面向并覆盖另一者的第三正极活性层22612，以降低析锂的风险。
第二极片组226包括多个第三极片2261，使得具备该电极组件22的电池单体20和电池100能够具有更高的能量密度。
如图24所示，在第二极片组226包括多个第三极片2261的实施例中，相邻的两个第三极片2261中一者的第三负极活性层22613面向且覆盖另一者的第三正极活性层22612，第二极片组226中连续设置的至少一部分第三极片2261形成第三极片区226a，第三极片区226a中的第三极片2261的第三正极活性层22612的长度沿第二方向X2逐渐增大。
“相邻的两个第三极片2261中一者的第三负极活性层22613面向且覆盖另一者的第三正极活性层22612”，是指相邻的两个第三极片2261中的一者的第三正极活性层22612在另一者的第三负极活性层22613上的投影位于该第三负极活性层22613内或者相邻的两个第三极片2261中的一者的第三正极活性层22612在另一者的第三负极活性层22613上的投影的轮廓与该第三负极活性层22613的轮廓重合。
“第三正极活性层22612的长度”，是指第三正极活性层22612沿第三极片2261的长度方向的尺寸。
在第三极片区226a中的第三极片2261的第三正极活性层22612的长度沿第二方向X2逐渐增大，使得第三极片区226a的第三正极活性层22612的长度能够适应内部空间异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。且相邻的两个第三极片2261中一者的第三负极活性层22613面向且覆盖另一者的第三正极活性层22612，能够降低析锂的风险，提高具备该电极组件22的电池单体20和电池100的安全性能。
在一些实施例中，第三极片区226a中的第三极片2261的第三负极活性层22613的长度沿第二方向X2逐渐增大。
“第三负极活性层22613的长度”，是指第三负极活性层22613沿第三极片2261的长度方向的尺寸。
若第三正极活性层22612的长度越大，面向并覆盖该第三正极活性层22612的第三负极活性层22613的长度也对应越大，以降低电极组件22析锂的风险。反之，若第三正极活性层22612的长度越小，面向并覆盖该第 三正极活性层22612的第三负极活性层22613的长度也对应越小，既降低析锂的风险，又避免活性材料浪费。
在第三极片区226a中，第三极片2261的第三负极活性层22613的长度沿第二方向X2逐渐增大，使得在第三极片区226a中，长度越大的第三正极活性层22612对应的第三负极活性层22613的长度也越大。
第三极片区226a中的第三极片2261的第三负极活性层22613的长度沿第二方向X2逐渐增大，则在第三极片区226a中，第三极片2261的第三负极活性层22613的长度沿第二方向X2的变化趋势与第三正极活性层22612的长度沿第三方向的变化趋势相同，以使第三极片区226a的各个第三极片2261的第三负极活性层22613的长度变化趋势适应第三正极活性层22612的长度的变化趋势，使得第三极片区226a的第三负极活性层22613的长度能够适应内部空间异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度；还能避免活性材料浪费。
在另一些实施例中，在第三极片区226a中，各个第三极片2261的第三负极活性层22613的长度也可以相同，各个第三负极活性层22613的长度与面向并覆盖长度最大的第三正极活性层22612的第三负极活性层22613的长度相同。
如图24所示，在一些实施例中，在第三极片区226a，相邻的两个第三正极活性层22612中的一者沿第三极片2261的长度方向的两端均超出另一者的两端；和/或，相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端均超出另一者的两端。
在相邻的两个第三正极活性层22612中的一者沿第三极片2261的长度方向的两端均超出另一者的两端的实施例中，相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端可以均超出另一者的两端；或者相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的一端与另一者的一端平齐，相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的另一端超出另一者的另一端；或者相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端与另一者的两端平齐。图24中示出了在第三极片区226a，相邻的两个第三正极活性层22612中的一者沿第三极片2261的长度方向的两端均超出另一者的两端；且相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端均超出另一者的两端的情况。
在相邻的两个第三正极活性层22612中的一者沿第三极片2261的长度方向的两端均超出另一者的两端的实施例中，相邻的两个第三正极活性层22612中的一者沿第三极片2261的宽度方向的两端可以均超出另一者沿第三极片2261的宽度方向的两端；或者相邻的两个第三正极活性层22612中的一者沿第三极片2261的宽度方向的两端可以与另一者沿第三极片2261的宽度方向的两端平齐；或者相邻的两个第三正极活性层22612中的一者沿第三极片2261的宽度方向的一端与另一者沿第三极片2261的宽度方向的一端平齐，相邻的两个第三正极活性层22612中的一者沿第三极片2261的宽度方向的另一端超出另一者沿第三极片2261的宽度方向的另一端。
相邻的两个第三正极活性层22612中的一者沿第三极片2261的长度方向的两端均超出另一者的两端，和/或，相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端均超出另一者的两端，使得第一极片区221a的第一正极活性层22112和/或第一负极活性层22113能够适应内部空间沿第三极片2261的长度方向两端均异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
壳体21的异形的内部空间还可以是其他成型方式，比如壳体21的相邻的两个壁之间形成拐角区，比如弧形拐角。如图24所示，壳体21可以具有沿第一方向X1相对的第一壁212和第二壁213以及沿第一极片的长度方向Y相对的第三壁214和第四壁215，第一壁212、第三壁214、第二壁213和第四壁215收尾依次链接。第一壁212和第三壁214之间通过一个弧形壁218连接形成一个拐角区A，第三壁214和第二壁213之间通过一个弧形壁218连接形成一个拐角区A，第二壁213和第四壁215之间通过一个弧形壁218连接形成一个拐角区A，第四壁215和第一壁212之间通过一个弧形壁218连接形成一个拐角区A，第一壁212、第二壁213、第三壁214、第四壁215和四个弧形壁共同形成异形的内部空间。
如图25所示，在另一些实施例中，在第三极片区226a，相邻的两个第三正极活性层22612中一者沿第三极片2261的长度方向的一端与另一者沿第三极片2261的长度方向的一端平齐；和/或，相邻的两个第三负极活性层22613中一者沿第三极片2261的长度方向的一端与另一者沿第三极片2261的长度方向的一端平齐。
在第三极片区226a，沿第二方向X2，第三极片2261的第三正极活性层22612的长度逐渐增大，在邻的两个第三正极活性层22612中一者沿第三极片2261的长度方向的一端与另一者沿第三极片2261的长度方向的一端平齐的情况下，相邻的两个第三正极活性层22612中一者沿第三极片2261的长度方向的另一端超出另一者沿第三极片2261的长度方向的另一端。
在相邻的两个第三正极活性层22612中一者沿第三极片2261的长度方向的一端与另一者沿第三极片2261的长度方向的一端平齐的实施例中，相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端可以均超出另一者的两端；或者相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的一端与另一者的一端平齐，相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的另一端超出另一者的另一端；或者相邻的两个第三负极活性层22613中的一者沿第三极片2261的长度方向的两端与另一者的两端平齐。
相邻的两个第三正极活性层22612中一者沿第三极片2261的长度方向的一端与另一者沿第三极片2261的长度方向的一端平齐，和/或，相邻的两个第三负极活性层22613中一者沿第三极片2261的长度方向的一端与另一者沿第一极片的长度方向Y的一端平齐，使得第三极片区226a的第三正极活性层22612和/或第三负极活性层22613能够适应内部空间沿第三极片2261的长度方向一端异形、另一端规则的壳体21，使得壳体21的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
如图25所示，第二极片组226中可以是所有第二极片225的第二正极活性层的长度沿第二方向X2逐渐增大，则第三极片区226a即第二极片组226。
如图24所示，在一些实施例中，第二极片组226中连续设置的至少一部分第三极片2261形成第三极片区226a，第三极片2261组中的另一部分第三极片2261形成第四极片区226b，在第三极片区226a中，第三正极活性层22612的长度最大和最小的第三极片2261分别为第三极片单元2261a和第四极片单元2261b；第四极片区226b设置于第三极片区226a的一侧，且第四极片区226b设置于第三极片单元2261a背离第四极片单元2261b的一侧，第四极片区226b中的第三极片2261与第三极片单元2261a相同。
“第四极片区226b中的第三极片2261和第三极片单元2261a相同”，包括第四极片区226b中的第三极片2261的第三正极活性物质层的长度和第三极片单元2261a的第三正极活性层22612的长度相同，第四极片区226b中的第三极片2261的第三负极活性物质层的长度和第三极片单元2261a的第三负极活性层22613的长度相同。第四极片区226b的第三极片2261的第三负极活性层22613面向第三极片单元2261a设置。
第四极片区226b中的第三极片2261的数量可以是一个，也可以是多个。
第四极片区226b中的第三极片2261与第三极片区226a中的第三正极活性层22612的长度最大的第三极片2261的相同，使得该电极组件22能够适应内部空间部分规整、另一部分异形的壳体21，使得壳体21的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
在一些实施例中，第四极片单元2261b位于电极组件22沿第一方向X1的一端。
第四极片单元2261b位于电极组件22沿第一方向X1的一端，可以理解为，第四极片单元2261b背离第三极片单元2261a的一侧没有其他极片。
在第三极片区226a，第四极片单元2261b的第三正极活性层22612的长度最小且第四极片单元2261b位于电极组件22沿第一方向X1的一端，使得第三极片区226a的第三极片2261能够适应内部空间异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
由于第四极片单元2261b的第三负极活性层22613设置于第四极片单元2261b的第三集流体22611的背离第三极片单元2261a的一侧，若第四极片单元2261b的第三负极活性层22613背离第三极片单元2261a的一侧未设置极片，则导致第四极片单元2261b的第三负极活性层22613被浪费，因此，请继续参见图24，在一些实施例中，第二极片组226还包括第二端部极片2262，第二端部极片2262设置于第四极片单元2261b背离第三极片单元2261a的一侧。第二端部极片2262包括第二端部集流体22621和设置于第二端部集流体22621面向第四极片单元2261b的一侧的第二端部正极活性层22622，第四极片单元2261b的第三负极活性层22613面向并覆盖第二端部极片2262的第二端部正极活性层22622。第二端部集流体22621背离第四极片单元2261b的一侧可以不设置活性层。
请继续参照图24，在一些实施例中，第一极片组221和所述第二极片组226关于第二极片225对称设置。即第一极片组221的各个第一极片2211在形状、大小、长短和排列上与第二极片组226的各个第三极片2261在形状、大小、长短和排列上相等或者相当。
第一极片组221和第二极片组226关于第二极片225对称设置，使得第二极片组226的第三正极活性层22612的长度能够适应内部空间异形的壳体21，且该电极组件22能够适应内部空间沿第一方向X1的两侧异形的壳体21，使得壳体21的异形的内部空间能够被充利用，从而有利于提高具备该电极组件22的电池单体20和电池100的能量密度。
在另一些实施例中，第一极片组221和第三极片2261组也可以不对称设置。比如，如图26所示，在第一极片区221a，相邻的两个第一正极活性层22112中的一者沿第一极片的长度方向Y的两端均超出另一者的两端；相邻的两个第一负极活性层22113中的一者沿第一极片的长度方向Y的两端均超出另一者的两端。在第三极片区226a，相邻的两个第三正极活性层22612中一者沿第三极片2261的长度方向的一端与另一者沿第三极片2261的长度方向的一端平齐；相邻的两个第三负极活性层22613中一者沿第三极片2261的长度方向的一端与另一者沿第一极片的长度方向Y的一端平齐。
如图27所示，在一些实施例中，第二负极活性层2252沿第三极片2261的长度方向的两端和第三负极活性层22613沿第三极片2261的长度方向的两端平齐，第三极片2261的长度方向与第一方向X1垂直。
第三活性层的长度和第二活性层的长度相同。第二活性层的长度为第二活性层沿第二极片225的长度方向的尺寸，第三活性层的长度为第三活性层沿第三极片2261的长度方向的尺寸。
第二负极活性层2252沿第三极片2261的长度方向的两端和第三负极活性层22613沿第三极片2261的长度方向的两端平齐，使得第三负极活性层22613的长度足够大，能够降低析锂的风险，提高具备该电极组件22的电池单体20和电池100的安全性能。
在第二极片组226包括多个第三极片2261的实施例中，各个第三极片2261可以相同。“各个第三极片2261相同”包括各个第三极片2261的第三负极活性物质层的长度相同，各个第三极片2261的第三正极活性物质层的长度相同。
本申请实施例还提供一种电池单体20，包括上述任意实施例提供的电极组件22。
上述任意实施例中提供的电极组件22，能够适应异形的空间且析锂的风险较低，将电极组件22容纳于内部为异形空间的壳体21内能够充分利用壳体21的异形的内部空间，从而有利于提高具备该电极组件22的电池单体20的能量密度和安全性能。
本申请实施例还提供一种电池100，包括箱体10和上述任意实施例提供的电池单体20，电池单体20容纳于箱体10内。
上述任意实施例提供的电池单体20能量密度较高和析锂的风险较低，包括上述任意实施例提供的电池单 体20的电池100的能量密封和安全性能均较好。
本申请实施例还提供一种用电设备，包括上述实施例提供的电池100。
本申请实施例提供一种电池单体20，电池单体20包括外壳和电极组件22，壳体21具有四个侧壁，四个侧壁依次连接围成容纳电极组件22空间，相邻的两个侧壁之间通过弧形壁过渡连接，从而在壳体21的四角形成拐角区，从而使得壳体21的内部空间异形。电极组件22包括第一极片组221、第二极片225和第二极片组226。第一极片组221包括沿第一方向X1层叠设置的多个第一极片2211。第二极片组226包括沿第二方向X2层叠设置的多个第三极片2261。
第一极片区221a中的连续设置的部分第一极片2211形成第一极片区221a，第一极片区221a的第一极片2211的第一正极活性物质层的长度沿第一方向X1逐渐增大，第一极片区221a的第一极片2211的第一负极活性物质层的长度沿第一方向X1逐渐增大。第一极片区221a中的连续设置的另一部分第一极片2211形成第二极片区221b，第二极片区221b的第一极片2211与第一极片区221a中的第一正极活性层22112的长度最大的第一极片2211相同。第二极片225的第二集流体2251沿第一方向X1的相对的两表面均设有第二负极活性层2252。第三极片2261组和第一极片组221关于第二极片225对称设置。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (17)

  1. 一种电极组件，包括：
    第一极片组，包括沿第一方向层叠设置的多个第一极片，所述第一极片包括第一集流体、第一正极活性层和第一负极活性层，所述第一正极活性层和所述第一负极活性层分别设置于所述第一集流体沿所述第一方向的两侧，相邻的两个所述第一极片中一者的所述第一负极活性层面向且覆盖另一者的所述第一正极活性层；
    所述第一极片组中连续设置的至少一部分所述第一极片形成第一极片区，所述第一极片区中的所述第一极片的所述第一正极活性层的长度沿所述第一方向逐渐增大。
  2. 根据权利要求1所述的电极组件，其中，所述第一极片区中的所述第一极片的所述第一负极活性层的长度沿所述第一方向逐渐增大。
  3. 根据权利要求1或2所述的电极组件，其中，所述第一负极活性层的边缘超出所述第一正极活性层的边缘；或者，所述第一负极活性层的边缘与所述第一正极活性层的边缘平齐。
  4. 根据权利要求1-3任一项所述的电极组件，其中，在所述第一极片区，相邻的两个所述第一正极活性层中的一者沿所述第一极片的长度方向的两端均超出另一者的两端；和/或，相邻的两个所述第一负极活性层中的一者沿所述第一极片的长度方向的两端均超出另一者的两端；
    所述第一极片的长度方向垂直所述第一方向。
  5. 根据权利要求1-3任一项所述的电极组件，其中，在所述第一极片区，相邻的两个所述第一正极活性层中一者沿所述第一极片的长度方向的一端与另一者沿所述第一极片的长度方向的一端平齐；和/或，相邻的两个所述第一负极活性层中一者沿所述第一极片的长度方向的一端与另一者沿所述第一极片的长度方向的一端平齐；
    所述第一极片的长度方向垂直所述第一方向。
  6. 根据权利要求1-5任一项所述的电极组件，其中，所述第一极片组中连续设置的至少一部分所述第一极片形成所述第一极片区，所述第一极片组中的另一部分所述第一极片形成第二极片区，在所述第一极片区中，所述第一正极活性层的长度最大和最小的所述第一极片分别为第一极片单元和第二极片单元；
    所述第二极片区设置于所述第一极片区的一侧，且所述第二极片区设置于所述第一极片单元背离所述第二极片单元的一侧，所述第二极片区中的所述第一极片与所述第一极片单元相同。
  7. 根据权利要求6所述的电极组件，其中，所述第二极片单元位于所述电极组件沿第二方向的一端，所述第一方向与所述第二方向相反。
  8. 根据权利要求1-7任一项所述的电极组件，其中，所述电极组件还包括第二极片，沿所述第一方向，所述第二极片设置于所述第一极片组的一侧，且与所述第一极片组中所述第一正极活性层长度最大的一者相邻设置；
    沿所述第二极片包括第二集流体和第二负极活性层，在所述第一方向，所述第二集流体至少面向所述第一极片的一侧设有所述第二负极活性层，所述第二集流体面向所述第一极片的一侧的所述第二负极活性层与其相邻的所述第一极片的所述第一正极活性层相对设置并覆盖所述第一正极活性层。
  9. 根据权利要求8所述的电极组件，其中，沿所述第一方向，所述第二集流体两侧均设有所述第二负极活性层。
  10. 根据权利要求9所述的电极组件，其中，所述电极组件还包括第二极片组，沿所述第一方向，所述第二极片组设置于所述第二极片背离所述第一极片组的一侧；
    所述第二极片组包括至少一个第三极片，所述第三极片包括第三集流体、第三正极活性层和第三负极活性层，在所述第一方向，所述第三正极活性层设置于所述第三集流体面向所述第二极片的一侧，所述第三负极活性层设置于所述第三集流体背离所述第二极片的一侧。
  11. 根据权利要求10所述的电极组件，其中，所述第三负极活性层的边缘超出所述第三正极活性层的边缘；或者，所述第三负极活性层的边缘与所述第三正极活性层的边缘平齐。
  12. 根据权利要求10或11所述的电极组件，其中，所述第二极片组包括多个所述第三极片，多个所述第三极片沿第二方向排布，所述第二方向与所述第一方向相反。
  13. 根据权利要求12所述的电极组件，其中，所述第一极片组和所述第二极片组关于所述第二极片对称设置。
  14. 根据权利要求10-12任一项所述的电极组件，其中，所述第二负极活性层沿所述第三极片的长度方向的两端和所述第三负极活性层沿所述第三极片的长度方向的两端平齐，所述第三极片的长度方向与所述第一方向垂直。
  15. 一种电池单体，包括如权利要求1-14任一项所述的电极组件。
  16. 一种电池，包括：
    箱体；以及
    如权利要求15所述的电池单体，所述电池单体容纳于所述箱体内。
  17. 一种用电设备，包括如权利要求16所述的电池。
PCT/CN2022/111214 2022-08-09 2022-08-09 电极组件、电池单体、电池及用电设备 WO2024031348A1 (zh)

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