CN216312002U

CN216312002U - Electrode assembly and battery cell

Info

Publication number: CN216312002U
Application number: CN202122602309.6U
Authority: CN
Inventors: 许湘春; 武冬冬; 李恺
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-04-15
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses an electrode assembly and a battery cell, and relates to the technical field of batteries; the electrode assembly includes an electrode main body, at least one first tab, and at least one second tab; the electrode main body is formed by winding a first electrode, an isolating film and a second electrode which are sequentially stacked together, the polarities of the first electrode and the second electrode are opposite, a first tab is arranged on the first electrode, and a second tab is arranged on the second electrode; and projections of all the tabs contained in the at least one first tab and the at least one second tab on a projection plane parallel to the thickness direction of the electrode main body along the length direction of the electrode main body are not overlapped. By the arrangement, when x-ray imaging detection is carried out along the length direction of the electrode main body, imaging of all the lugs is not overlapped, so that imaging of each lug is convenient to distinguish, the judgment efficiency and the accuracy of a judgment result can be fully ensured, the phenomena of missing judgment and erroneous judgment can be reduced, and the risk of short circuit of the battery cell can be reduced.

Description

Electrode assembly and battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to an electrode assembly and a battery cell.

Background

Among the prior art, no matter coiling electric core or lamination electric core are when the assembly, for improving space utilization, can bend and push down utmost point ear behind the welded terminal, can lead to utmost point ear root to bend to electric core direction, cause anodal ear and negative pole short circuit. In order to solve the problem, the battery cell can observe the positions of positive and negative electrode tabs of a positive electrode group and a negative electrode group through X-Ray before assembly, check the relative position between the positive electrode and the negative electrode and judge whether the battery cell has a short circuit risk.

However, when the structure of the conventional winding battery cell is used for X-Ray detection imaging, the imaging of the positive and negative electrode tabs cannot be clearly distinguished, so that the accuracy of a judgment result is influenced, and the phenomena of missing judgment and erroneous judgment appear.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an electrode assembly, which can ensure the judgment efficiency and the accuracy of a judgment result by easily distinguishing the imaging of a first tab and a second tab of a positive electrode and a negative electrode when X-Ray detection imaging is carried out, thereby reducing the phenomena of missing judgment and erroneous judgment and reducing the risk of short circuit of a battery cell.

Another object of the present invention is to provide a battery cell, which includes the electrode assembly. Therefore, the X-ray imaging detection device has the advantages of ensuring the convenience and the accuracy of X-ray imaging detection operation and reducing the occurrence of short circuit.

The embodiment of the utility model is realized by the following steps:

in a first aspect, the present invention provides an electrode assembly comprising:

the electrode comprises an electrode main body, at least one first tab and at least one second tab;

the electrode main body is formed by winding a first electrode, an isolating film and a second electrode which are sequentially stacked together, the polarities of the first electrode and the second electrode are opposite, a first tab is arranged on the first electrode, and a second tab is arranged on the second electrode; and projections of all the tabs contained in the at least one first tab and the at least one second tab on a projection plane parallel to the thickness direction of the electrode main body along the length direction of the electrode main body are not overlapped.

In an alternative embodiment, any two tabs among all the tabs included in the at least one first tab and the at least one second tab are arranged in parallel and at intervals in the thickness direction of the electrode main body; and along the length direction of the electrode main body, any two lugs in all the lugs contained in at least one first lug and at least one second lug are arranged in a staggered mode.

In an alternative embodiment, the first and second tabs are located on either side of a centerline of the thickness of the electrode body.

In an alternative embodiment, the electrode body has a first end and a second end along a length of the electrode body, the first tab is located on a first side of a centerline of the thickness of the electrode body and is positioned adjacent the first end, and the second tab is located on a second side of the centerline of the electrode body and is positioned adjacent the second end.

In an alternative embodiment, the first and second tabs are located on either side of a centerline of the length of the electrode body.

In an alternative embodiment, any two adjacent tabs among all the tabs included in the at least one first tab and the at least one second tab are spaced apart by 0.5 to 1mm in the thickness direction of the electrode body.

In an alternative embodiment, any two adjacent tabs among all the tabs included in the at least one first tab and the at least one second tab are spaced apart by 1mm in the thickness direction of the electrode body.

In a second aspect, the present invention provides a battery cell comprising a casing and the electrode assembly of any one of the preceding embodiments; the shell comprises a top cover and a shell, wherein the top cover is provided with a positive pole column and a negative pole column; the electrode assembly is arranged in the shell, the top cover is in welded fit with the shell, the first pole lug is connected with the positive pole column, and the second pole lug is connected with the negative pole column.

In an optional embodiment, the battery cell comprises a plurality of electrode assemblies arranged in parallel, the electrode assemblies are sequentially arranged along the thickness direction of the electrode main body, and projections of each tab in the electrode assemblies on a projection plane parallel to the thickness direction of the electrode main body along the length direction of the electrode main body are not overlapped.

In an alternative embodiment, any two adjacent tabs among all the tabs in the plurality of electrode assemblies are spaced 0.5 to 1mm apart in the thickness direction of the electrode main body.

Embodiments of the utility model have at least the following advantages or benefits:

embodiments of the present invention provide an electrode assembly including an electrode main body, at least one first tab, and at least one second tab; the electrode main body is formed by winding a first electrode, an isolating film and a second electrode which are sequentially stacked together, the polarities of the first electrode and the second electrode are opposite, a first tab is arranged on the first electrode, and a second tab is arranged on the second electrode; and projections of all the tabs contained in the at least one first tab and the at least one second tab on a projection plane parallel to the thickness direction of the electrode main body along the length direction of the electrode main body are not overlapped. The electrode main body of the electrode assembly is provided with a projection plane parallel to the thickness direction of the electrode main body, and projections of all lugs of at least one first lug and at least one second lug on the projection plane along the length direction of the electrode main body are not overlapped, so that when x-ray imaging detection is carried out along the length direction of the electrode main body, the imaging of any two lugs is not overlapped, the imaging of each lug is convenient to distinguish, the judgment efficiency and the accuracy of a judgment result can be fully ensured, the phenomena of missed judgment and erroneous judgment can be reduced, and the risk of short circuit of an electric core can be reduced.

The embodiment of the utility model also provides a battery, which comprises the battery core. Therefore, the X-ray imaging detection device has the advantages of ensuring the convenience and the accuracy of X-ray imaging detection operation so as to ensure the quality and the service life of the X-ray imaging detection device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a first schematic structural diagram of an electrode assembly of a battery cell according to an embodiment of the present invention;

fig. 2 is a structural schematic diagram ii of an electrode assembly of a battery cell according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram three of an electrode assembly of a battery cell provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram four of an electrode assembly of a battery cell provided in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an electrode assembly of a battery cell according to an embodiment of the present invention when the electrode assembly is coupled to a connecting sheet;

fig. 6 is a first schematic partial structure diagram of a battery cell according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a partial structure of a battery cell according to an embodiment of the present invention.

101-electrode assembly; 103-a first tab; 105-a second tab; 107-electrode body; 109-a first electrode; 111-a barrier film; 113-a second electrode; 115-a first connecting piece; 117-second connecting piece; 119-a first pole tab; 121-second pole tab.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the related art, no matter the winding battery cell or the lamination battery cell is assembled, in order to improve the space utilization rate, the tab can be bent and pressed down after the terminal is welded, so that the root of the tab can be bent towards the battery cell, and the short circuit between the positive tab and the negative electrode can be caused. In order to solve the problem, the battery cell can observe the positions of positive and negative electrode tabs of a positive electrode group and a negative electrode group through X-Ray before assembly, check the relative position between the positive electrode and the negative electrode and judge whether the battery cell has risks of reverse insertion and short circuit. However, when the conventional winding battery cell structure is used for X-Ray detection imaging of inverted insertion of the tabs, the imaging of the positive and negative tabs cannot be clearly distinguished, so that the accuracy of a judgment result is influenced, and the phenomena of missed judgment and erroneous judgment are caused.

In view of the above, the inventors have analyzed the problems, and as a result, it is found that the reason why it is difficult to distinguish the positive and negative electrode tabs is that the prior art mostly adopts an arrangement manner in which the positive electrode tabs and the negative electrode tabs are on the same side, and this arrangement manner has a disadvantage that the positive and negative electrode tabs are located on the same side of the image when the X-Ray with the electrode tabs inserted upside down is used for detection imaging, and the positive and negative electrode tabs appear alternately, which is not favorable for direct judgment of the positive and negative electrode tabs. Therefore, the embodiment provides an electrode assembly and a battery cell comprising the electrode assembly, wherein an electrode main body of the electrode assembly is provided with a projection plane parallel to the thickness direction of the electrode main body, and projections of all tabs on the projection plane along the length direction of the electrode main body are not overlapped, so that when x-ray imaging detection is performed along the length direction of the electrode main body, the images of all the tabs are not overlapped, thereby being convenient for distinguishing the images of each tab, fully ensuring the judgment efficiency and the accuracy of a judgment result, further reducing the occurrence of phenomena of missing judgment and erroneous judgment, and further reducing the risk of short circuit of the battery cell. The structure of the electrode assembly and the battery cell including the same will be described in detail below.

Fig. 1 is a first schematic structural diagram of an electrode assembly 101 of a battery cell provided in this embodiment; fig. 2 is a structural schematic diagram of a second electrode assembly 101 of a battery cell provided in this embodiment; fig. 3 is a schematic structural diagram three of the electrode assembly 101 of the battery cell provided in this embodiment; fig. 4 is a fourth schematic structural diagram of the electrode assembly 101 of the battery cell provided in this embodiment. Referring to fig. 1 to 4, the battery cell provided in the present embodiment is a square battery cell, and includes a casing (not shown) and an electrode assembly 101 (i.e., a bare cell structure).

In detail, in the present embodiment, the casing is a casing structure of the battery cell, and has a substantially rectangular parallelepiped structure, and includes a top cover and a casing. Wherein, the shell is provided with an open accommodating chamber which comprises two large surfaces, two end surfaces and a bottom surface. Two big faces are parallel relatively and the interval sets up, and two terminal surfaces are relative and parallel interval sets up between two big faces, and is connected perpendicularly with big face, and the bottom surface is connected and is set up in the bottom of two terminal surfaces and two big faces for the top of two terminal surfaces and two big faces forms uncovered. Meanwhile, the large surface is a wide surface with a larger size than the end surface, so that the thickness direction of the whole shell is the vertical connecting line direction of the two large surfaces, and the length direction of the whole shell is the vertical connecting direction of the two end surfaces. The electrode assembly 101 can be accommodated in the accommodating cavity through the opening, the top cover is covered on the opening of the shell and is in welding fit with the shell, a positive pole column and a negative pole column are arranged on the top cover, and the positive pole and the negative pole of the electrode assembly 101 can be connected with the positive pole column and the negative pole column respectively so as to realize the input and the output of energy of the electrode assembly 101. When the battery cell with the structure is assembled, the electrode assembly 101 and the top cover can be matched firstly, then the matched whole battery cell is assembled into the shell, and finally the top cover and the shell are welded, so that the battery cell is not described in detail in the embodiment.

In detail, in the present embodiment, the electrode assembly 101 specifically includes an electrode main body 107, at least one first tab 103, and at least one second tab 105. The electrode main body 107 is formed by winding a first electrode 109, a separator 111, and a second electrode 113, which are stacked in sequence, together, and the polarities of the first electrode 109 and the second electrode 113 are opposite, for example, the first electrode 109 may be a positive electrode sheet, the second electrode 113 may be a negative electrode sheet, and the first electrode 109 may be a negative electrode sheet, and the second electrode 113 may be a positive electrode sheet.

Meanwhile, fig. 5 is a schematic structural diagram of the battery cell provided in this embodiment when the electrode assembly 101 is matched with the connecting sheet. Referring to fig. 1 to 5, in the present embodiment, the first tab 103 is disposed on the first electrode 109, and the second tab 105 is disposed on the second electrode 113, so that at least one of the first tabs 103 can be directly connected to the positive post of the top cover or indirectly connected to the positive post of the top cover through the first connecting piece 115, and at least one of the second tabs 105 can be directly connected to the negative post of the top cover or indirectly connected to the negative post of the top cover through the second connecting piece 117, so as to implement input and output of cell energy.

Also, in the present embodiment, the electrode main body 107 has a projection plane parallel to the thickness direction (i.e. ab direction in fig. 1) (for example, the projection plane may be arranged parallel to the two end surfaces of the housing), and all the tabs included in the at least one first tab 103 and the at least one second tab 105 do not overlap in projection on the projection plane along the length direction (i.e. dc direction in fig. 1) of the electrode main body 107. By the arrangement, when the X-Ray imaging detection of the inverted lug is carried out along the length direction of the electrode main body 107, the imaging of all lugs after the X-Ray imaging detection of the inverted lug is not overlapped, so that the imaging of each lug can be distinguished conveniently, the judgment efficiency and the accuracy of a judgment result can be fully ensured, the phenomena of missing judgment and erroneous judgment can be reduced, and the risk of short circuit of the battery cell can be reduced.

In more detail, in the present embodiment, in the thickness direction (i.e., ab direction in fig. 1) of the electrode body 107, any two tabs among all the tabs included in the at least one first tab 103 and the at least one second tab 105 are arranged in parallel and spaced apart, and in the length direction (i.e., dc direction in fig. 1) of the electrode body 107, any two tabs among all the tabs included in the at least one first tab 103 and the at least one second tab 105 are arranged in a staggered manner. Through the arrangement, when the X-Ray imaging detection of the pole lug inverted insertion is carried out, imaging detection can be carried out along the length direction (namely the dc direction in fig. 1) of the electrode main body 107, and the imaging of each pole lug detected by the X-Ray imaging detection of the pole lug inverted insertion is staggered and arranged at intervals, so that the imaging of each pole lug can be distinguished conveniently, the judgment efficiency and the accuracy of a judgment result can be fully ensured, the phenomena of missed judgment and erroneous judgment can be reduced, and the risk of short circuit of the battery cell can be reduced.

Alternatively, in this embodiment, the first tab 103 and the second tab 105 may be respectively disposed as one tab, and the first tab 103 and the second tab 105 are respectively disposed on two sides of a center line of the thickness of the electrode main body 107, and are disposed in parallel. The first tab 103 and the second tab 105 are respectively arranged on two sides of the center line of the thickness of the electrode main body 107, so that when imaging detection is carried out along the length direction of the electrode main body 107, imaging results of the first tab 103 and the second tab 105 are positioned on two sides of the electrode main body 107 after winding, and interference between the imaging results and the electrode main body is avoided, thereby being more beneficial to improving the efficiency and quality of X-Ray detection and reducing the probability of misjudgment during X-Ray detection. In other embodiments, the number of the first tab 103 and the second tab 105 may also be adjusted according to requirements, which is not limited in this embodiment.

Further alternatively, in the present embodiment, along the length direction of the electrode main body 107, the electrode main body 107 has a first end (i.e., the left end in fig. 1) and a second end (i.e., the right end in fig. 1), the first tab 103 is located on a first side of the center line of the thickness of the electrode main body 107 and is disposed adjacent to the first end, i.e., adjacent to the left end, and the second tab 105 is located on a second side of the center line of the electrode main body 107 and is disposed adjacent to the second end, i.e., adjacent to the right end. Under the condition that first utmost point ear 103 and second utmost point ear 105 distribute in the both sides of the central line of electrode main part 107 thickness, arrange length direction's both ends respectively with first utmost point ear 103 and second utmost point ear 105 again for first utmost point ear 103 and second utmost point ear 105 relative distance are far away, are more difficult for mutual interference, thereby do benefit to the risk that reduces electric core short circuit.

Further, in the present embodiment, the first tab 103 and the second tab 105 are located on both sides of the center line of the length of the electrode body 107. The first tab 103 and the second tab 105 are distributed on two sides of a center line of the thickness of the electrode main body 107, one of the first tab 103 and the second tab 105 is close to the left end of the length direction, and the other one of the first tab 103 and the second tab 105 is clearly arranged on two sides of the center line of the length of the electrode main body 107 on the premise that the other one of the first tab 103 and the second tab 105 is close to the right end of the length direction, so that the first tab 103 and the second tab 105 are arranged in a staggered manner, one of images of the first tab 103 and the second tab 105 is located on the right lower side of the battery cell, and the other one of images of the first tab 103 and the second tab 105 is located on the left upper side of the battery cell, thereby fully ensuring that the first tab 103 and the second tab 105 cannot interfere with each other, and reducing the risk of short circuit of the battery cell while ensuring the efficiency and quality of X-Ray detection.

Of course, in other embodiments, based on the fact that the first tab 103 and the second tab 105 are distributed on two sides of the center line of the thickness of the electrode main body 107 and are spaced apart by a certain distance, the first tab 103 and the second tab 105 which are disposed in a staggered manner may also be arranged on one side of the electrode assembly 101 after being wound, and even the first tab 103 and the second tab 105 may also be disposed without being staggered, for example, may be disposed in an opposite and spaced manner, which can ensure that the first tab 103 and the second tab 105 have a certain distance in the thickness direction of the electrode main body 107, so as to distinguish the imaging results of the first tab 103 and the second tab 105 in the X-Ray detection, which is not limited in this embodiment.

Referring to fig. 4 again, of all the tabs included in the at least one first tab 103 and the at least one second tab 105, any two tabs are spaced apart by a distance h in the thickness direction of the electrode body, where h is in the range of 0.5 to 1 mm. For example, as shown in fig. 4, in the present embodiment, the number of the first tab 103 and the second tab 105 is one, and the first tab 103 and the second tab 105 are spaced apart by a distance h in the thickness direction of the electrode main body 107, where h is in the range of 0.5 to 1 mm. Preferably 1 mm. Through the arrangement of the thickness, the compactness of the cell structure can be ensured, and the first lug 103 and the second lug 105 can be arranged at an imaging interval respectively when the X-Ray is detected, so that interference between the lugs can not be caused, the efficiency and the quality of the X-Ray detection can be improved, and the misjudgment probability when the X-Ray is detected can be further reduced.

In this embodiment, a plurality of first electrodes 109 are disposed on a first side of a center line of a thickness of the electrode main body 107, each first electrode 109 is provided with one first pole tab 119, and the plurality of first pole tabs 119 are welded to form the first pole tab 103. The second side of the center line of the thickness of the electrode body 107 has a plurality of layers of second electrodes 113, each layer of second electrodes 113 is provided with a second pole tab 121, and the plurality of second pole tabs 121 are welded to form the second pole tab 105. The distance h between the first tab 103 and the second tab 105 specifically refers to a vertical distance between the innermost first tab 119 and the innermost second tab 121, and the two tabs are arranged at intervals, so that the first tab 103 and the second tab 105 can be fully ensured to be arranged at intervals for imaging respectively, and further, the efficiency and quality of X-Ray detection can be fully ensured.

Fig. 6 is a schematic view of a partial structure of a battery cell provided in this embodiment; fig. 7 is a schematic diagram of a partial structure of a battery cell provided in this embodiment. Referring to fig. 6 and 7, in the embodiment, the battery cell may be configured to include a plurality of electrode assemblies 101, the plurality of electrode assemblies 101 are disposed in parallel, the plurality of electrode assemblies 101 are sequentially arranged along the thickness direction of the electrode main body 107, and projections of each tab in all the electrode assemblies 101 on a projection plane parallel to the thickness direction of the electrode main body 107 along the length direction of the electrode main body 107 are all non-overlapping, so that the plurality of tabs may be sequentially distributed along the thickness direction of the electrode main body 107 in a staggered manner.

And is embodied such that, in any adjacent two electrode assemblies 101 in the thickness direction of the electrode main body 107, the second tab 105 of one electrode assembly 101 is disposed adjacent to the first tab 103 of the other electrode assembly 101, or the second tab 105 of one electrode assembly 101 is disposed adjacent to the second tab 105 of the other electrode assembly 101. When the second tab 105 of one electrode assembly 101 is disposed adjacent to the first tab 103 of another electrode assembly 101, the tabs of the plurality of electrode assemblies 101 are arranged in an arrangement of positive, negative, positive, and negative electrodes, and when the second tab 105 of one electrode assembly 101 is disposed adjacent to the second tab 105 of another electrode assembly 101, the tabs of the plurality of electrode assemblies 101 are arranged in an arrangement of positive, negative, and positive electrodes.

Through the arrangement of the electrode assemblies 101, when the X-Ray detection operation is carried out, the electrode assemblies 101 can be detected at one time, the imaging of the lugs of the electrode assemblies 101 is arranged at intervals in sequence, the X-Ray detection efficiency and quality can be fully ensured, and the misjudgment probability during the X-Ray detection can be effectively reduced.

Alternatively, in the present embodiment, any two adjacent tabs among all the tabs in the plurality of electrode assemblies 101 are spaced apart by 0.5 to 1mm, preferably 1mm, in the thickness direction of the electrode main body 107. Through the arrangement, the compactness of the cell structure can be further ensured, and the first lug 103 and the second lug 105 can be arranged at the imaging interval respectively when the X-Ray is detected, so that the imaging of all the lugs cannot interfere with each other, the X-Ray detection efficiency and quality can be further improved, and the misjudgment probability when the X-Ray is detected can be fully reduced.

The following describes in detail the assembly process, working principle and beneficial effects of the battery cell provided by the embodiment of the present invention:

in the process of assembling the battery cell, the first electrode 109, the isolation film 111, and the second electrode 113 may be wound together to form the electrode main body 107, and then the first tab 103 is disposed on the first electrode 109, and the second tab 105 is disposed on the second electrode 113, such that the first tab 103 and the second tab 105 are disposed at intervals along the thickness direction of the electrode main body 107, and are respectively located on two sides of the wound electrode main body 107 in the thickness direction, so as to obtain the electrode assembly 101; then, the first tab 103 is directly connected with the positive pole of the top cover or indirectly connected with the positive pole of the top cover through the first connecting sheet 115, the second tab 105 is directly connected with the negative pole of the top cover or indirectly connected with the negative pole of the top cover through the second connecting sheet 117, then the connected whole is placed into the shell, and the shell and the top cover are welded. When the battery cell is used for discharging or charging operation, energy can be input and output through the positive pole column and the negative pole column.

In the above process, the first tab 103 and the second tab 105 are arranged at intervals in the thickness direction of the electrode main body 107 by the battery cell, so that when x-ray imaging detection is performed, the imaging of the first tab 103 and the imaging of the second tab 105 are not overlapped, thereby facilitating the distinguishing of the imaging of the first tab 103 and the imaging of the second tab 105, fully ensuring the accuracy of the judgment efficiency and the judgment result, further reducing the occurrence of phenomena of missed judgment and erroneous judgment, and further reducing the risk of short circuit of the battery cell.

In summary, the embodiment of the present invention provides an electrode assembly 101 and a battery cell, which can improve the efficiency and quality of X-Ray detection, reduce the misjudgment during X-Ray detection, and ensure the safety and reliability of the battery cell.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrode assembly, comprising:

the electrode main body is formed by winding a first electrode, an isolating film and a second electrode which are sequentially stacked together, the polarities of the first electrode and the second electrode are opposite, the first tab is arranged on the first electrode, and the second tab is arranged on the second electrode; and projections of all the tabs contained in at least one first tab and at least one second tab along the length direction of the electrode main body on a projection plane parallel to the thickness direction of the electrode main body are not overlapped.

2. The electrode assembly of claim 1, wherein:

in the thickness direction of the electrode main body, any two tabs among all the tabs contained in at least one first tab and at least one second tab are arranged in parallel at intervals; and along the length direction of the electrode main body, any two lugs in all the lugs contained in at least one first lug and at least one second lug are arranged in a staggered mode.

3. The electrode assembly of claim 2, wherein:

the first lug and the second lug are respectively positioned on two sides of the center line of the thickness of the electrode main body.

4. The electrode assembly of claim 3, wherein:

along the length direction of electrode main part, electrode main part has first end and second end, first utmost point ear is located the first side of the central line of electrode main part thickness, and is close to the first end sets up, second utmost point ear is located the second side of the central line of electrode main part, and is close to the second end sets up.

5. The electrode assembly of claim 2, wherein:

the first tab and the second tab are located on either side of a center line of the length of the electrode body.

6. The electrode assembly of any of claims 2 to 5, wherein:

in all the tabs contained in at least one first tab and at least one second tab, any two adjacent tabs are in the interval of 0.5-1 mm in the thickness direction of the electrode main body.

7. The electrode assembly of claim 6, wherein:

in all the tabs contained in at least one first tab and at least one second tab, any two adjacent tabs are spaced by 1mm in the thickness direction of the electrode main body.

8. A battery cell, comprising:

the shell comprises a top cover and a shell, wherein the top cover is provided with a positive pole column and a negative pole column;

the electrode assembly of any one of claims 1 to 7, disposed within the can, the cap being in welded engagement with the can, and the first tab being connected to the positive post and the second tab being connected to the negative post.

9. The cell of claim 8, wherein:

the battery cell comprises a plurality of electrode assemblies which are arranged in parallel, the electrode assemblies are sequentially arranged along the thickness direction of the electrode main body, and the projections of each lug in the electrode assemblies along the length direction of the electrode main body on a projection plane parallel to the thickness direction of the electrode main body are not overlapped.

10. The cell of claim 9, wherein:

in all the tabs in the electrode assemblies, any two adjacent tabs are spaced by 0.5-1 mm in the thickness direction of the electrode main body.