CN221928499U - Electrode slice, bare cell, battery cell, energy storage device and electric equipment - Google Patents

Abstract

The application discloses an electrode plate, a bare cell, a battery cell, an energy storage device and electric equipment. The electrode plate comprises a plate body and a lug arranged on the plate body, the lug extends along one side of the plate body in a protruding mode in the width direction, the lug comprises a first lug and a plurality of second lugs, the first lug is adjacent to one end portion of the plate body along the length direction of the first lug, the second lugs are sequentially arranged in the length direction of the plate body, the plane perpendicular to the thickness direction of the plate body and passing through the plate body is a first plane, and the cross section area of the first lug cut by the first plane is larger than the cross section area of the second lug cut by the first plane.

Description

Electrode slice, bare cell, battery cell, energy storage device and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to an electrode plate, a bare cell, a battery cell, an energy storage device and electric equipment.

Background

Currently, in the process of producing an energy storage device, for example, a secondary battery, it is necessary to laminate or wind a positive electrode sheet, a separator and a negative electrode sheet, and then electrically connect tabs of a winding core to form a bare cell of the lithium battery. Typically, a mark hole is provided in a material region of the electrode sheet, and is used to identify a cutting position in a winding/stacking process during a winding/stacking process of the bare cell when the secondary battery is manufactured. However, mark holes designed by the pole piece of the current secondary battery are formed by high-energy laser cutting, and side effects such as burrs, beads, thermal influences and the like are easy to occur, and can influence the performance of the bare cell, and meanwhile, the risk of penetrating through a diaphragm is also caused; meanwhile, the inner wall of the mark hole also has the problems of low yield of the secondary battery caused by metal leakage.

Disclosure of utility model

In view of the above problems, the application provides an electrode slice, a bare cell, a battery cell, an energy storage device and electric equipment, which can solve the problem that the winding/stacking automation of the electrode slice cannot be realized because the winding/stacking completion position of the electrode slice is required to be manually judged.

In a first aspect, the application provides an electrode sheet, the electrode sheet includes a pole piece body and a pole lug disposed on the pole piece body, the pole lug extends along one side of the width direction of the pole piece body in a protruding manner, the pole lug includes a first pole lug and a plurality of second pole lugs, the first pole lug is disposed adjacent to one end of the pole piece body along the length direction thereof, the plurality of second pole lugs are sequentially arranged along the length direction of the pole piece body, a plane perpendicular to the thickness direction of the pole piece body and passing through the pole piece body is a first plane, and a cross-sectional area of the first pole lug cut by the first plane is larger than a cross-sectional area of the second pole lug cut by the first plane.

In the electrode sheet of the above technical solution, the first tab is disposed adjacent to one end of the electrode sheet body along the length direction thereof, the plurality of second tabs are sequentially arranged along the length direction of the electrode sheet body, and the cross-sectional area of the first tab cut by the first plane is larger than the cross-sectional area of the second tab cut by the first plane, so that the first tab can mark a position (a first knife position) where a bare cell starts winding/laminating and cuts in the winding/laminating process and/or a position (a last knife position) where winding/laminating ends and cuts, and the winding/laminating automation is realized without manually determining the starting position and the ending position of winding/laminating. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body of the electrode piece, side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body, so that the performance of the bare cell can be ensured, and the risk of puncture of the diaphragm is avoided; on the other hand, the problem of metal leakage caused by the fact that mark holes are formed in the electrode plate body can be avoided, and the manufacturing yield of the electrode plate can be guaranteed.

As an alternative solution of the present application, the second tab has at least one oblique angle compared to the first tab.

In the technical scheme, compared with the first tab, the second tab has at least one oblique angle, so that the first tab can be distinguished on the one hand, and the first tab can be conveniently identified; on the other hand, the material consumption of the second lug can be reduced, and the cost is saved.

As an alternative technical scheme of the application, compared with the first tab, the second tab has two oblique angles, and the two oblique angles are respectively and symmetrically arranged on two opposite sides of the second tab in the length direction of the pole piece body.

In the technical scheme, compared with the first tab, the second tab has two oblique angles, so that the first tab can be distinguished on the one hand, and the first tab can be conveniently identified; on the other hand, the material consumption of the second lug can be reduced, and the cost is saved. Simultaneously, on the length direction of pole piece body, two oblique angles set up in the opposite sides of second utmost point ear respectively symmetry, can further reduce the material of second utmost point ear, save the cost, can increase the differentiation degree of first utmost point ear and second utmost point ear again, further convenient discernment can also convenient processing.

As an optional technical solution of the present application, in a width direction of the pole piece body, a width of the first tab is greater than a width of the second tab.

In the technical scheme, the width of the first tab is larger than that of the second tab, so that the first tab can be distinguished more easily, and the identification accuracy and the identification efficiency of the identification equipment on the first tab are further improved; on the other hand, the material consumption of the second lug can be further reduced, and the cost is saved.

In a second aspect, the present application provides a bare cell, where the bare cell is formed by winding/stacking the electrode plates according to any one of the above-mentioned aspects, a plurality of the tabs of the electrode plates are stacked, and the first tab is located at the outermost side of the stacked tabs.

In the bare cell of the above technical solution, the first tab of the electrode tab is disposed adjacent to one side end of the electrode tab body along the length direction thereof, the plurality of second tabs are sequentially arranged along the length direction of the electrode tab body, and the cross-sectional area of the first tab is larger than that of the second tab, so that the first tab can mark a position (a first cutter position) where the bare cell starts winding/stacking and cuts in the winding/stacking process and/or a position (a last cutter position) where the bare cell terminates winding/stacking and cuts, without manually determining the starting position and the ending position of winding/stacking, thereby realizing winding/stacking automation. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body of the electrode piece, side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body, so that the performance of the bare cell can be ensured, and the risk of puncture of the diaphragm is avoided; on the other hand, the problem of metal leakage caused by the fact that mark holes are formed in the pole piece body can be avoided, and the manufacturing yield of the bare cell can be guaranteed.

As an optional technical scheme of the application, the electrode plate is one of a negative electrode plate and a positive electrode plate, and a plurality of lugs of the other one of the negative electrode plate and the positive electrode plate are the same.

In the above technical scheme, one of the negative electrode plate and the positive electrode plate adopts the electrode plate in the above technical scheme, and the starting position and/or the ending position of winding/stacking can be determined by means of the first electrode lug in the electrode plate, so that the automation of the process of forming the bare cell by winding/stacking is realized; and a plurality of lugs in the other electrode plate of negative electrode plate and positive electrode plate are the same each other, can simplify the production technology of another electrode plate, save manufacturing cost.

As an alternative technical scheme of the application, the electrode plates are a negative electrode plate and a positive electrode plate, and the first tab of the negative electrode plate and the first tab of the positive electrode are respectively positioned on two opposite sides of the bare cell.

In the above technical solution, the negative electrode plate and the positive electrode plate adopt the electrode plates in the above technical solution, and the first tabs of the negative electrode plate and the first tabs of the positive electrode are respectively located at opposite sides of the bare cell, so, in the process of winding/stacking to form the bare cell, the first tab of the negative electrode plate or the positive electrode plate can be used for determining a position (a first knife position) for starting winding/stacking to perform cutting, namely, a winding/stacking starting position, and correspondingly, the first tab of the positive electrode plate or the negative electrode plate can be used for determining a position (a last knife position) for stopping winding/stacking to perform cutting, namely, a winding/stacking ending position, and the precision of the cutting position can be improved.

In a third aspect, the present application provides a battery cell, including a bare cell according to any one of the above-mentioned aspects.

In the bare cell of the battery cell according to the above technical solution, the first tab of the electrode tab is disposed adjacent to one side end portion of the electrode tab body along the length direction thereof, the plurality of second tabs are sequentially arranged along the length direction of the electrode tab body, and the cross-sectional area of the first tab is larger than that of the second tab, so that the first tab can mark a position (a first cutter position) where the bare cell starts winding/stacking and cuts in the winding/stacking process and/or a position (a last cutter position) where the bare cell ends winding/stacking and cuts, and the winding/stacking automation is realized without manually determining the starting position and the ending position of winding/stacking. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body of the electrode piece, side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body, so that the performance of the bare cell can be ensured, and the risk of puncture of the diaphragm is avoided; on the other hand, the problem of metal leakage caused by the fact that mark holes are formed in the pole piece body can be avoided, and the manufacturing yield of the battery cell can be guaranteed.

In a fourth aspect, the present application provides an energy storage device, where the energy storage device includes a battery cell according to any one of the above-mentioned aspects.

In the battery cell of the energy storage device of the above technical scheme, the first tab of the electrode sheet of the bare cell is adjacent to one side end portion of the electrode sheet body along the length direction thereof, the plurality of second tabs are sequentially arranged along the length direction of the electrode sheet body, and the cross section area of the first tab is larger than that of the second tab, therefore, the first tab can mark the position (the first cutter position) where the bare cell starts winding/laminating and cuts in the winding/laminating process and/or the position (the last cutter position) where the bare cell stops winding/laminating and cuts, and the winding/laminating automation is realized without manually determining the starting position and the ending position of winding/laminating. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body of the electrode piece, side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body, so that the performance of the bare cell can be ensured, and the risk of puncture of the diaphragm is avoided; on the other hand, the problem of metal leakage caused by the fact that mark holes are formed in the pole piece body can be avoided, and the manufacturing yield of the energy storage device can be guaranteed.

In a fifth aspect, the present application provides an electric device, where the electric device includes the energy storage device according to any one of the above-mentioned aspects, and the energy storage device is used to provide electric energy.

In the battery cell of the energy storage device of the electric equipment in the technical scheme, the first tab of the electrode plate of the bare cell is adjacent to one side end part of the electrode plate body along the length direction of the electrode plate body, the plurality of second tabs are sequentially arranged along the length direction of the electrode plate body, and the cross section area of the first tab is larger than that of the second tab, so that the first tab can mark the position (the first cutter position) where the bare cell starts winding/laminating and cuts and/or the position (the last cutter position) where the bare cell stops winding/laminating and cuts in the winding/laminating process, the starting position and the ending position of winding/laminating do not need to be manually determined, and the winding/laminating automation is realized. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body of the electrode piece, side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body, so that the performance of the bare cell can be ensured, and the risk of puncture of the diaphragm is avoided; on the other hand, the problem of metal leakage caused by the fact that mark holes are formed in the pole piece body can be avoided, and the production yield of electric equipment can be guaranteed.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic plan view of an electrode sheet according to some embodiments of the present application;

Fig. 2 is a schematic plan view of an electrode sheet according to other embodiments of the present application;

fig. 3 is a schematic plan view of an electrode sheet according to still other embodiments of the present application;

Fig. 4 is a schematic view of a structure of a bare cell formed by winding/stacking electrode sheets according to some embodiments of the present application;

fig. 5 is a schematic structural view of a bare cell formed by winding/stacking the electrode sheets shown in fig. 4;

fig. 6 is a schematic view of a structure of a bare cell formed by winding/stacking electrode sheets according to other embodiments of the present application;

Fig. 7 is a schematic structural view of a bare cell formed by winding/stacking the electrode sheets shown in fig. 6;

Fig. 8 is a schematic view of a structure of a bare cell formed by winding/stacking electrode sheets according to still other embodiments of the present application;

fig. 9 is a schematic structural view of a bare cell formed by winding/stacking the electrode sheets shown in fig. 8;

Fig. 10 is a schematic perspective view of a battery cell according to some embodiments of the present application;

FIG. 11 is a schematic perspective view of an energy storage device according to some embodiments of the present application;

fig. 12 is a schematic plan view of a powered device according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

10000. A vehicle;

1000. An energy storage device; 2000. a controller; 3000. a motor;

300. A case; 301. a first portion; 303. a second portion;

100. a battery cell; 10. a bare cell; 11. an electrode sheet; 11A, a negative electrode sheet; 11B, a positive electrode sheet; 111. a pole piece body; 1111. a first side; 1113. a second side; 1115. a first end; 1117. a second end; 113. a tab; 1131. a first tab; 1133. a second lug; 11331. a notch region; 13. a diaphragm; 30. a housing; 50. an end cap.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the positional or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the positional or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In describing embodiments of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements.

Referring to fig. 1, the present application provides an electrode sheet 11. The electrode tab 11 includes a tab body 111 and a tab 113 disposed on the tab body 111. The tab 113 protrudes and extends along one side of the width direction W of the pole piece body 111, the tab 113 includes a first tab 1131 and a plurality of second tabs 1133, the first tab 1131 is adjacent to one end of the pole piece body 111 along the length direction L thereof, the plurality of second tabs 1133 are sequentially arranged along the length direction L of the pole piece body 111, a plane perpendicular to the thickness direction T (as shown in fig. 4) of the pole piece body 111 and passing through the pole piece body 111 is a first plane (LW plane), and a cross-sectional area of the first tab 1131 cut by the first plane (LW plane) is larger than a cross-sectional area of the second tab 1133 cut by the first plane (LW plane).

The electrode plate 11 is a thin sheet made of conductive material, and the surface of the electrode plate 11 can be in direct contact with electrolyte or electrode reactant to play roles in catalyzing electrochemical reaction and transferring electrons. The electrode sheet 11 is generally made of a material such as metal, alloy, conductive polymer, etc., and has good conductivity and chemical stability.

The electrode sheet 11 may be classified into a positive electrode sheet 11A (anode electrode sheet) and a negative electrode sheet 11B (cathode electrode sheet) according to different application requirements. The positive electrode tab 11A is generally used for electrochemical oxidation reaction as the positive electrode of the battery cell 100 (shown in fig. 10), and the negative electrode tab 11B is generally used for electrochemical reduction reaction as the negative electrode of the battery cell 100 (shown in fig. 10). The electrode sheet 11 in the present application may be either a positive electrode sheet 11A or a negative electrode sheet 11B.

In the thickness direction of the electrode sheet 11, the electrode sheet 11 generally includes a current collector (not shown) and an electrode active layer (not shown, an electrode active layer may be provided on one side of the current collector, or electrode active layers may be provided on both sides of the current collector) provided on at least one surface of the current collector. The tab body 111 is a portion of the electrode tab 11 provided with an electrode active layer, and the tab 113 is a portion of the electrode tab 11 not provided with an electrode active layer, wherein the tab 113 may be directly cut from a current collector, and the tab 113 is generally used for electrically connecting with external current collecting members (e.g., a switching tab and an electrode terminal) to conduct current in or out. Specifically, the positive electrode tab 11A includes a positive electrode current collector (e.g., aluminum foil) and a positive electrode active material layer (e.g., ternary material, lithium iron phosphate, or lithium cobalt oxide) coated on the surface of the positive electrode current collector. The anode electrode tab 11B includes an anode current collector (e.g., copper foil) and an anode active material layer (e.g., carbon or silicon) coated on the surface of the anode current collector.

In addition, it should be noted that, in the present application, before the electrode sheet body 111 is wound/laminated to form the bare cell 10 (fig. 5, 7 or 9), the length dimension of the electrode sheet body 111 is far greater than the width dimension of the electrode sheet body 111, the length direction L of the electrode sheet body 111 is the winding direction of the electrode sheet 11, the width direction W of the electrode sheet body 111 is perpendicular to the length direction L of the electrode sheet body 111, and the thickness direction T of the electrode sheet 11 is perpendicular to both the length direction L of the electrode sheet body 111 and the width direction W of the electrode sheet body 111, that is, the thickness direction T of the electrode sheet 11 is perpendicular to the first plane (LW plane).

More specifically, with continued reference to fig. 1, the pole piece body 111 has a first side 1111 and a second side 1113 opposite to each other in the width direction W, and the tab 113 may be extended convexly along one side of the width direction W of the pole piece body 111: tab 113 extends convexly along first side 1111 of pole piece body 111, or tab 113 extends convexly along second side 1113 of pole piece body 111. The present application is described with respect to the protruding extension of the first side 1111 of the pole piece body 111.

As described above, the electrode sheet 11 in the present application may be the positive electrode sheet 11A and/or the negative electrode sheet 11B. Correspondingly, the tab 113 of the positive electrode tab 11A is a positive electrode tab 113, and the negative electrode tab 11B is a negative electrode tab 113. Regardless of whether the tab 113 is a positive tab 113 or a negative tab 113, the tab 113 includes a first tab 1131 and a plurality of second tabs 1133.

The pole piece body 111 has a first end 1115 and a second end 1117 opposite to each other in the length direction L, the first end 1115 of the pole piece body 111 corresponds to a winding/stacking start position of the electrode sheet 11 during winding/stacking of one bare cell 10 (fig. 5, 7 or 9), and the second end 1117 of the pole piece body 111 corresponds to a winding/stacking end position of the electrode sheet 11 during winding/stacking of the bare cell 10 (fig. 5, 7 or 9). Meanwhile, the first end 1115 of the pole piece body 111 corresponds to a winding/stacking end position of the electrode piece 11 during the process of winding/stacking to form the previous bare cell 10, and the second end 1117 of the pole piece body 111 corresponds to a winding/stacking start position of the electrode piece 11 during the process of winding/stacking to form the next bare cell 10. The arrangement of the first tab 1131 adjacent to the one end of the pole piece body 111 along the length direction L thereof means that the first tab 1131 is arranged adjacent to the first end 1115 of the pole piece body 111, wherein "adjacent" means that the distance between the first tab 1131 and the first end 1115 of the pole piece body 111 in the length direction L of the pole piece body 111 is smaller than a preset distance, and the preset distance may be a known empirical value.

The cross-sectional area of the first tab 1131 taken by the first plane is the cross-sectional area of the first tab 1131 taken by the long and wide plane (LW plane) of the pole piece body 111, and the cross-sectional area of the second tab 1133 taken by the first plane is the cross-sectional area of the second tab 1133 taken by the long and wide plane (LW plane) of the pole piece body 111. The cross-sectional areas of the plurality of second tabs 1133 are all the same as each other, and the cross-sectional area of the first tab 1131 is different from the cross-sectional area of the plurality of second tabs 1133.

When the first tab 1131 is identified, the production equipment can generate a corresponding control command, and cut off the electrode sheet 11 in response to the control command, so as to be used as a first knife for winding/stacking one bare cell 10 (fig. 5, 7 or 9) or as a last knife for winding/stacking the bare cell 10 (fig. 5, 7 or 9), without manually determining a winding/stacking start position and a winding/stacking end position, thereby realizing winding/stacking automation.

In the electrode sheet 11 of the above-mentioned technical solution, the first tab 1131 is disposed adjacent to one side end of the pole piece body 111 along the length direction L thereof, the plurality of second tabs 1133 are sequentially arranged along the length direction L of the pole piece body 111, and the cross-sectional area of the first tab 1131 is larger than that of the second tab 1133, so that the first tab 1131 can mark a position (first knife position) where one bare cell 10 (fig. 5, 7 or 9) starts winding/stacking and cuts in the winding/stacking process and/or a position (last knife position) where winding/stacking is terminated and cuts, and the winding/stacking automation is realized without manually determining the starting position and the ending position of winding/stacking. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body 111 of the electrode plate 11, so that side effects such as burrs, beads and thermal influence on the pole piece body 111 can be avoided, the performance of the bare cell 10 (shown in fig. 5, 7 or 9) can be ensured, and the separator does not have the risk of being pierced; on the other hand, the problem of metal leakage due to mark holes formed in the electrode sheet body 111 can be avoided, and the manufacturing yield of the electrode sheet 11 can be ensured.

Referring to fig. 1 to fig. 3, as an alternative embodiment of the present application, the second tab 1133 has at least one notch region 11331 compared to the first tab 1131.

Specifically, the shapes of the plurality of second tabs 1133 are the same as each other, and in order to satisfy that the cross-sectional area of the first tab 1131 is larger than that of the second tab 1133, a notch region 11331 may be designed on the second tab 1133 as compared to the first tab 1131. The number of the notch areas 11331 may be one (as shown in fig. 1), two (as shown in fig. 2 and 3), three, four, or more. The shape of the notched areas 11331 include, but are not limited to, triangular (as shown in fig. 1 and 2), rectangular (as shown in fig. 3), semi-circular, oval, U-shaped, trapezoidal, or other polygonal shape. When the shape of the notch 11331 is triangular, the second tab 1133 has at least one oblique angle compared to the first tab 1131.

In the present solution, the shapes of the plurality of second tabs 1133 are the same as each other, so that the manufacturing process of the tab 113 can be simplified; compared with the first tab 1131, the second tab 1133 is designed with at least one notch region 11331 (e.g., an oblique angle), so that on one hand, the first tab 1131 can be distinguished, and the first tab 1131 can be conveniently identified; on the other hand, the material consumption of the second lug 1133 can be reduced, and the cost is saved; on the other hand, it can be ensured that a good electrical connection can be made when the first tab 1131 and the second tab 1133 are laminated together.

Of course, in other alternative solutions, in order to satisfy that the cross-sectional area of the first tab 1131 is larger than the cross-sectional area of the second tab 1133, the shapes of the plurality of second tabs 1133 may be the same, and the shapes of the first tab 1131 and the second tab 1133 are different, but only the cross-sectional area of the first tab 1131 is larger than the cross-sectional area of the second tab 1133, so as to distinguish the first tab 1131.

Referring to fig. 2 or fig. 3, further, as an alternative solution of the present application, compared with the first tab 1131, the second tab 1133 has two notch regions 11331, and the two notch regions 11331 are symmetrically disposed on opposite sides of the second tab 1133 in the length direction L of the pole piece body 111.

Likewise, where the second tab 1133 has two notched areas 11331, the shape of the notched areas 11331 include, but are not limited to, triangular (as shown in fig. 2), rectangular (as shown in fig. 3), semi-circular, oval, U-shaped, trapezoidal, or other polygonal shape. Similarly, when the notch 11331 is triangular, the second tab 1133 has two oblique angles, which are symmetrically disposed on opposite sides of the second tab 1133 in the longitudinal direction L of the pole piece body 111, compared to the first tab 1131.

In the technical scheme, compared with the first tab 1131, the second tab 1133 has two notch areas 11331 (e.g. oblique angles), so that on one hand, the first tab 1131 can be distinguished, and the first tab 1131 can be conveniently identified; on the other hand, the material consumption of the second lug 1133 can be reduced, and the cost is saved. Meanwhile, on the length direction L of the pole piece body 111, two notch areas 11331 (e.g., oblique angles) are symmetrically arranged on two opposite sides of the second pole ear 1133, so that the material consumption of the second pole ear 1133 can be further reduced, the cost is saved, the distinguishing degree of the first pole ear 1131 and the second pole ear 1133 can be increased, the identification is further facilitated, and two notch areas 11331 (e.g., oblique angles) are symmetrically arranged on two opposite sides of the second pole ear 1133, so that the manufacturing process can be simplified, and the processing is facilitated.

Referring to fig. 1 and 2, as an alternative solution of the present application, in the width direction W of the pole piece body 111, the width W1 of the first tab 1131 is equal to the width W2 of the second tab 1133, so that good electrical connection can be formed when the first tab 1131 and the second tab 1133 are stacked together.

Referring to fig. 3, as another alternative solution of the present application, in the width direction W of the pole piece body 111, the width W1 of the first tab 1131 is greater than the width W2 of the second tab 1133, so that on one hand, the first tab 1131 can be more easily distinguished, and the identification accuracy and the identification efficiency of the production equipment on the first tab 1131 are further improved; on the other hand, the material consumption of the second lug 1133 can be further reduced, and the cost is saved.

Referring to fig. 4 to 9, the present application further provides a bare cell 10. The bare cell 10 is formed by winding and stacking the electrode sheet 11 according to any of the above embodiments, and the plurality of tabs 113 of the electrode sheet 11 are stacked, with the first tab 1131 being located at the outermost side of the stacked tabs 113.

The bare cell 10 is a member that causes electrochemical reaction in the battery cell 100, the bare cell 10 is mainly formed by winding or laminating a positive electrode tab 11A and a negative electrode tab 11B, and a separator 13 is provided between the positive electrode tab 11A and the negative electrode tab 11B. The portions of the positive electrode tab 11A and the negative electrode tab 11B having active materials constitute the main body portion of the bare cell 10, the portions of the positive electrode tab 11A and the negative electrode tab 11B having no active materials constitute the tabs 113, the tabs 113 of the positive electrode tab 11A are the positive electrode tabs 113, the tabs 113 of the negative electrode tab 11B are the negative electrode tabs 113, and the positive electrode tabs 113 and the negative electrode tabs 113 may be located at one end of the main body portion together or at opposite ends of the main body portion, respectively. The tab 113 is a current transmission end of the bare cell 10, and is used for transmitting current.

In some instances, the bare cell 10 may also be referred to as an electrode assembly, a roll, a laminate, a cell, or the like.

Referring to fig. 1, in the bare cell 10 of the present embodiment, the first tab 1131 of the electrode sheet 11 is disposed adjacent to one side end of the pole piece body 111 along the length direction L thereof, the plurality of second tabs 1133 are sequentially arranged along the length direction L of the pole piece body 111, and the cross-sectional area of the first tab 1131 is larger than that of the second tab 1133, so that the first tab 1131 can mark a position (a first knife position) where the bare cell 10 starts winding/stacking and cuts in the winding/stacking process and/or a position (a last knife position) where the winding/stacking is terminated and cuts, without manually determining the starting position and the ending position of the winding/stacking, thereby realizing winding/stacking automation. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body 111 of the electrode plate 11, so that side effects such as burrs, beads and thermal influence on the pole piece body 111 can be avoided, the performance of the bare cell 10 can be ensured, and the separator does not have the risk of being pierced; on the other hand, the problem of metal leakage caused by the mark hole formed in the electrode plate body 111 can be avoided, and the manufacturing yield of the bare cell 10 can be ensured.

Referring to fig. 4 to 7, as an alternative solution of the present application, the electrode tab 11 is one of a negative electrode tab 11B and a positive electrode tab 11A, and the tabs 113 of the other one of the negative electrode tab 11B and the positive electrode tab 11A are the same.

In some examples, the electrode tab 11 (shown in fig. 1) in the above-mentioned technical solution is a negative electrode tab 11B, as shown in fig. 4 and 5, and at this time, the plurality of tabs 113 in the positive electrode tab 11A are all the same, and "the same" herein means that the cross-sectional area and the shape are the same. For example, the cross sections of the plurality of tabs 113 in the positive electrode tab 11A are each rectangular, and the areas of each rectangle are the same. At this time, the first tab 1131 of the negative electrode tab 11B is used to confirm the winding/stacking start position during winding/stacking to form one bare cell 10, and may also be used to confirm the winding/stacking end position during winding/stacking to form the last bare cell 10. In this way, the starting position and/or the ending position of winding/stacking can be determined only by the first tab 1131 in the negative electrode tab 11B, so as to realize automation of the process of forming the bare cell 10 by winding/stacking; the tabs 113 in the positive electrode tab 11A are identical to each other, so that the production process of the positive electrode tab 11A can be simplified, and the production cost can be saved.

In other examples, the electrode tab 11 (shown in fig. 1) in the above-mentioned technical solution is a positive electrode tab 11A, and as shown in fig. 6 and 7, the plurality of tabs 113 in the negative electrode tab 11B are the same, and the "same" herein means that the cross-sectional area and the shape are the same. For example, the cross sections of the plurality of tabs 113 in the negative electrode tab 11B are each rectangular, and the areas of each rectangle are the same. At this time, the first tab 1131 in the positive electrode tab 11A is used to confirm the winding/stacking start position during the winding/stacking process of one bare cell 10, and may also be used to confirm the winding/stacking end position during the winding/stacking process of the last bare cell 10. In this way, the starting position and/or the ending position of winding/stacking can be determined only by the first tab 1131 in the positive electrode tab 11A, so as to realize automation of the process of forming the bare cell 10 by winding/stacking; the plurality of tabs 113 in the negative electrode tab 11B are identical to each other, so that the production process of the negative electrode tab 11B can be simplified, and the production cost can be saved.

Referring to fig. 8 and 9, as another alternative solution of the present application, the electrode plates 11 in the above solution are a negative electrode plate 11B and a positive electrode plate 11A, and the first tab 1131 of the negative electrode plate 11B and the first tab 1131 of the positive electrode are respectively located at two opposite sides of the bare cell 10.

Specifically, the electrode tab 11B and the positive electrode tab 11A in the above technical solution are both adopted as the electrode tab 11 (shown in fig. 1), and the first tab 1131 of the negative electrode tab 11B and the first tab 1131 of the positive electrode are respectively located at opposite sides of the bare cell 10, so that, in the process of winding/stacking to form the bare cell 10, the first tab 1131 of the negative electrode tab 11B or the positive electrode tab 11A can be used to determine the position (the first knife position) where the winding/stacking is started and cut in the process of winding/stacking to form one bare cell 10, that is, the starting position of winding/stacking, and correspondingly, the first tab 1131 of the positive electrode tab 11A or the negative electrode tab 11B can be used to determine the position (the last knife position) where the winding/stacking is stopped and cut in the process of winding/stacking to form the same bare cell 10, that is, the end position of winding/stacking is, and the accuracy of the cutting position can be improved.

Referring to fig. 10, the present application further provides a battery cell 100. The battery cell 100 includes the bare cell 10 according to any of the above-described aspects.

In the battery cell 100, the number of the bare cells 10 may be one or more. The battery cell 100 includes a bare cell 10 (please refer to fig. 5, 7 or 9), a case 30, and an end cap 50. The battery cell 100 also includes an electrolyte that wets the bare cell 10. When the battery cell 100 is a lithium ion battery, lithium ions can move to the positive electrode tab 11A through the electrolyte and intercalate into the positive electrode active material of the positive electrode tab 11A, and lithium ions can also move to the negative electrode tab 11B through the electrolyte and intercalate into the negative electrode active material of the negative electrode tab 11B.

The case 30 and the end cap 50 are members for defining the internal environment of the battery cell 100 together, and the internal environment defined by the case 30 and the end cap 50 is for accommodating the bare cell 10 and the electrolyte.

In some implementations, the housing 30 and the end cap 50 may be separate components, specifically, the housing 30 has an opening, and the end cap 50 covers the opening of the housing 30 to define the internal environment of the battery cell 100 together with the housing 30 and isolate the internal environment of the battery cell 100 from the external environment.

In other implementations, the housing 30 and the end cap 50 may be integrally formed, specifically, a common connection surface may be formed between the end cap 50 and the housing 30 before the bare cell 10 is put into the housing, and when the bare cell 10 needs to be packaged after the bare cell 10 is put into the housing, the end cap 50 is covered with the housing 30. For example, when the battery cell 100 is a soft-pack battery, the aluminum-plastic film can be punched to form the housing 30 and the end cover 50 of the battery cell 100, then the bare cell 10 is put into the internal environment formed by the aluminum-plastic film punched, and then the opening of the aluminum-plastic film is fixed by edge sealing such as side sealing and top sealing. Of course, the battery cell 100 may not be limited to a soft pack battery, and the materials of the case 30 and the end cap 50 are not limited to an aluminum plastic film.

In some examples, the number of end caps 50 may be one. Of course, in other examples, the number of end caps 50 may be two, with two end caps 50 being disposed at opposite ends of the housing 30. In addition, the case 30 may be in the shape of a cylindrical case 30, a square case 30, etc., and may be specifically determined according to the specific shape and size of the bare cell 10. The materials of the housing 30 and the end cap 50 may be various, such as but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

Referring to fig. 1, in the bare cell 10 of the battery cell 100 according to the above-mentioned technical solution, the first tab 1131 of the electrode plate 11 is disposed adjacent to one side end portion of the pole piece body 111 along the length direction L thereof, the plurality of second tabs 1133 are sequentially arranged along the length direction L of the pole piece body 111, and the cross-sectional area of the first tab 1131 is larger than that of the second tab 1133, so that the first tab 1131 can mark a position (a first knife position) where the bare cell 10 starts winding/stacking and cuts in the winding/stacking process and/or a position (a last knife position) where the bare cell ends winding/stacking and cuts, and the winding/stacking automation is realized without manually determining the starting position and the ending position of winding/stacking. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body 111 of the electrode plate 11, so that side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body 111, the performance of the bare cell 10 can be ensured, and the diaphragm 13 (shown in fig. 4) does not have the risk of being pierced; on the other hand, the problem of metal leakage caused by the mark hole formed in the electrode plate body 111 can be avoided, and the manufacturing yield of the battery cell 100 can be ensured.

Referring to fig. 11, an energy storage device 1000 is provided in the present application. The energy storage device 1000 (e.g., a secondary battery) includes the battery cell 100 of any of the above-described aspects.

The energy storage device 1000 includes a case 300 and a battery cell 100, and the battery cell 100 is accommodated in the case 300. The case 300 is used to provide an accommodating space for the battery cell 100, and the case 300 may have various structures. In some embodiments, the case 300 may include a first portion 301 and a second portion 303, the first portion 301 and the second portion 303 being overlapped with each other, the first portion 301 and the second portion 303 together defining an accommodating space for accommodating the battery cell 100. The second portion 303 may be a hollow structure with one end opened, the first portion 301 may be a plate-shaped structure, and the first portion 301 covers the opening side of the second portion 303, so that the first portion 301 and the second portion 303 together define an accommodating space; the first portion 301 and the second portion 303 may also be hollow structures with one side open, and the open side of the first portion 301 is covered with the open side of the second portion 303. Of course, the case 300 formed by the first portion 301 and the second portion 303 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the energy storage device 1000, the plurality of battery cells 100 may be connected in series, parallel, or a series-parallel connection between the plurality of battery cells 100, where the series-parallel connection refers to that the plurality of battery cells 100 are connected in both series and parallel. The plurality of battery cells 100 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 100 is accommodated in the box 300; of course, the energy storage device 1000 may also be a battery module formed by connecting a plurality of battery cells 100 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case 300. The energy storage device 1000 may also include other structures, for example, the energy storage device 1000 may also include a bus member for making electrical connection between the plurality of battery cells 100.

In the battery cell 100 of the energy storage device 1000 according to the above-mentioned technical solution, the first tab 1131 of the electrode tab 11 of the bare cell 10 is disposed adjacent to one side end of the pole piece body 111 along the length direction L thereof, the plurality of second tabs 1133 are sequentially arranged along the length direction L of the pole piece body 111, and the cross-sectional area of the first tab 1131 is larger than that of the second tab 1133, so that the first tab 1131 can mark a position (a first knife position) where the bare cell 10 starts winding/stacking and cuts in the winding/stacking process and/or a position (a last knife position) where the bare cell 10 terminates winding/stacking and cuts, without manually determining the starting position and the ending position of winding/stacking, thereby realizing winding/stacking automation. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body 111 of the electrode plate 11, so that side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body 111, the performance of the bare cell 10 can be ensured, and the diaphragm 13 (shown in fig. 4) does not have the risk of being pierced; on the other hand, the problem of metal leakage caused by the mark hole formed in the pole piece body 111 can be avoided, and the manufacturing yield of the energy storage device 1000 can be ensured.

Referring to fig. 12, the application further provides an electric device. Referring to fig. 10, the powered device includes an energy storage device 1000 according to any one of the above embodiments, where the energy storage device 1000 is used to provide electric energy.

The battery cell 100 disclosed in the present application may be used for electric devices using the energy storage device 1000 as a power source or various energy storage systems using the energy storage device 1000 as an energy storage element. The powered device may be, but is not limited to, a cell phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft, or the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes (including unmanned aerial vehicles), rockets, space planes, and spacecraft, and the like.

The present application is described by taking electric equipment as an example of a vehicle 10000, referring to fig. 12, fig. 12 is a schematic structural diagram of the vehicle 10000 according to some embodiments of the present application. The vehicle 10000 can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle. The energy storage device 1000 is provided inside the vehicle 10000, and the energy storage device 1000 may be provided at the bottom, the head, or the tail of the vehicle 10000. The energy storage device 1000 may be used to power the vehicle 10000, for example, the energy storage device 1000 may be used as an operating power source for the vehicle 10000. The vehicle 10000 can also include a controller 2000 and a motor 3000, the controller 2000 being configured to control the energy storage device 1000 to power the motor 3000, for example, for operating power requirements during start-up, navigation and driving of the vehicle 10000.

In some embodiments of the present application, the energy storage device 1000 may not only be used as an operating power source for the vehicle 10000, but also as a driving power source for the vehicle 10000, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 10000.

Referring to fig. 1, in a battery unit 100 of an energy storage device 1000 of an electric device according to the present application, a first tab 1131 of an electrode sheet 11 of a bare cell 10 is disposed adjacent to an end portion of a pole piece body 111 along a length direction L thereof, a plurality of second tabs 1133 are sequentially arranged along the length direction L of the pole piece body 111, and a cross-sectional area of the first tab 1131 is larger than that of the second tab 1133, so that the first tab 1131 can mark a position (a first knife position) where the bare cell 10 starts winding/stacking and cuts and/or a position (a last knife position) where the bare cell 10 terminates winding/stacking and cuts in a winding/stacking process, without manually determining a starting position and a terminating position of winding/stacking, thereby realizing winding/stacking automation. Meanwhile, on one hand, mark holes are not required to be formed in the pole piece body 111 of the electrode plate 11, so that side effects such as burrs, beads and thermal influence can be avoided from being generated on the pole piece body 111, the performance of the bare cell 10 can be ensured, and the diaphragm 13 (shown in fig. 4) does not have the risk of being pierced; on the other hand, the problem of metal leakage caused by the mark holes formed in the pole piece body 111 can be avoided, and the production yield of electric equipment can be ensured.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. It is intended that the application not be limited to the particular embodiments disclosed herein, but that the application will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. An electrode sheet, characterized in that the electrode sheet comprises:

A pole piece body; and

The pole piece comprises a pole piece body, and is characterized in that the pole piece body is arranged on the pole piece body, the pole piece extends along one side of the width direction of the pole piece body in a protruding mode, the pole piece comprises a first pole piece and a plurality of second pole pieces, the first pole pieces are adjacent to one end portion of the pole piece body along the length direction of the pole piece body, the second pole pieces are sequentially arranged along the length direction of the pole piece body, the thickness direction of the pole piece body is perpendicular, a plane passing through the pole piece body is a first plane, and the cross section area of the first pole piece, which is cut by the first plane, is larger than the cross section area of the second pole piece, which is cut by the first plane.

2. The electrode tab of claim 1, wherein the second tab has at least one bevel angle as compared to the first tab.

3. The electrode tab of claim 1, wherein the second tab has two oblique angles, as compared to the first tab, that are symmetrically disposed on opposite sides of the second tab, respectively, in a longitudinal direction of the tab body.

4. The electrode tab of claim 1, wherein the width of the first tab is greater than the width of the second tab in the width direction of the tab body.

5. A bare cell, wherein the bare cell is formed by winding/stacking the electrode sheet according to any one of claims 1 to 4, a plurality of the tabs of the electrode sheet are stacked, and the first tab is located at the outermost side of the stacked tabs.

6. The bare cell according to claim 5, wherein the electrode tab is one of a negative electrode tab and a positive electrode tab, and a plurality of tabs of the other of the negative electrode tab and the positive electrode tab are all identical.

7. The bare cell of claim 5, wherein the electrode tabs are a negative electrode tab and a positive electrode tab, the first tab of the negative electrode tab and the first tab of the positive electrode being located on opposite sides of the bare cell, respectively.

8. A battery cell comprising a bare cell according to any one of claims 5-7.

9. An energy storage device comprising the battery cell of claim 8.

10. A powered device comprising the energy storage device of claim 9 for providing electrical energy.