Battery

Abstract

The utility model discloses a battery which comprises a battery cell, a first pole piece and a second pole piece are laminated and then wound to form the battery cell, the first pole piece comprises a plurality of first straight parts and a plurality of first arc parts, the first straight parts and the first arc parts are alternately arranged along the length direction of the first pole piece, and the second straight parts and the first arc parts are alternately arranged along the thickness direction of the battery cell. The multiple first straight parts are arranged in a stacked mode, each first straight part comprises a first connecting piece and a first body, the first connecting pieces are connected to the first bodies and protrude out of the first bodies, and the multiple first connecting pieces are connected with one another; the first tab comprises a first part and a second part, the first part is connected with the second part, the first part is connected to the first main body, and the second part is connected to the first connecting piece; and the second tab is connected to the second pole piece. The battery provided by the utility model has the characteristic of high charging speed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the related art, a battery includes a housing and an electrode core. The electrode core is disposed inside the housing. The electrode core is made by a positive electrode sheet and a negative electrode sheet. Specifically, after the positive electrode sheet and the negative electrode sheet are respectively manufactured, the positive electrode sheet and the negative electrode sheet are stacked together, and then the two are wound to form the electrode core.

[0003] Among them, after the battery is used up, it needs to be charged. The charging method of the battery is specifically to connect with an external charging device through the ear and charge the electrode core. The ears of the existing electrode cores are usually disposed at one end of the electrode sheet or in the middle of the electrode sheet. However, this still results in a slow charging speed of the battery. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery, which can have the characteristic of relatively fast charging speed.

[0005] The battery according to the embodiment of the utility model includes:

[0006] An electrode core formed by winding after laminating a first electrode sheet and a second electrode sheet, the first electrode sheet includes a plurality of first flat portions and a plurality of first arc portions, along the length direction of the first electrode sheet, the first flat portions and the first arc portions are alternately arranged, along the thickness direction of the electrode core, a plurality of the first flat portions are stacked, the first flat portion includes a first connecting member and a first main body, the first connecting member is connected to the first main body, and the first connecting member protrudes from the first main body, and a plurality of the first connecting members are connected to each other;

[0007] A first ear, including a first part and a second part, the first part and the second part are connected, the first part is connected to the first main body, and the second part is connected to the first connecting member;

[0008] A second ear, connected to the second electrode sheet.

[0009] The battery according to the embodiment of the present utility model has at least the following beneficial effects: The battery cell includes a first pole piece and a second pole piece. After the first pole piece and the second pole piece are wound, the first pole piece includes a plurality of first straight portions and a plurality of first arc portions. The first arc portions may specifically be the corners of the first pole piece. Among them, the first straight portion includes a first connecting member, and there are a plurality of first connecting members, and the plurality of first connecting members are connected to each other. The first part of the first pole ear is connected to the first main body, and the second part is connected to the first connecting member. When the battery is charging, the current can enter the first main body through the first part, and the current can also enter the plurality of first connecting members through the second part and enter the plurality of first straight portions from the first connecting member. In this way, the current can quickly enter each of the first straight portions and the first arc portions, which shortens the path of the current to each area of the first pole piece, thereby improving the charging speed of the battery. Specifically, the battery can have the characteristic of a relatively fast charging speed.

[0010] For the battery according to some embodiments of the present utility model, the second part includes a first section and a second section. The two ends of the second section are respectively connected to the first section and the first part, and the first section and the first part are arranged in parallel.

[0011] For the battery according to some embodiments of the present utility model, the distance between the first section and the first part is A, and A ≥ 8 mm.

[0012] For the battery according to some embodiments of the present utility model, the length of the first part is greater than the length of the first section.

[0013] For the battery according to some embodiments of the present utility model, along the width direction of the battery cell, the distance from the first section to the edge of the battery cell is B, and B ≥ 7 mm.

[0014] For the battery according to some embodiments of the present utility model, the second pole piece includes a plurality of second straight portions and a plurality of second arc portions. Along the length direction of the second pole piece, the second straight portions and the second arc portions are alternately arranged. Along the thickness direction of the battery cell, the plurality of second straight portions are stacked. The second straight portion includes a second connecting member and a second main body. The second connecting member is connected to the second main body, and the second connecting member protrudes from the second main body. The plurality of second connecting members are connected to each other;

[0015] The second pole ear includes a third part and a fourth part. The third part is connected to the fourth part. The third part is connected to the second main body, and the fourth part is connected to the second connecting member.

[0016] For the battery according to some embodiments of the present utility model, the fourth part includes a third section and a fourth section. The two ends of the fourth section are respectively connected to the third section and the fourth part, and the third section and the fourth part are arranged in parallel.

[0017] For the battery according to some embodiments of the present utility model, the length by which the first part protrudes from the battery cell is C, and 12 mm ≤ C ≤ 15 mm.

[0018] For the battery according to some embodiments of the present utility model, the length of the second part is D, and 2.5 mm ≤ D ≤ 3.5 mm.

[0019] For the battery according to some embodiments of the present utility model, along the width direction of the battery cell, the distance from the first part to the edge of the battery cell is F, and F ≥ 7 mm.

[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0021] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0022] Figure 1 is a schematic diagram of the battery according to the first embodiment of the present utility model;

[0023] Figure 2 is a schematic diagram of the battery according to the second embodiment of the present utility model;

[0024] Figure 3 is a schematic diagram of the battery according to the third embodiment of the present utility model;

[0025] Figure 4 is a cross-sectional schematic diagram of the battery cell in the battery according to some embodiments of the present utility model;

[0026] Figure 5 is a schematic diagram of the unfolded first pole piece in the battery according to some embodiments of the present utility model;

[0027] Figure 6 is a schematic diagram of the unfolded second pole piece in the battery according to some embodiments of the present utility model;

[0028] Figure 7 is a schematic diagram of the first pole ear in the battery according to some embodiments of the present utility model;

[0029] Figure 8 is a schematic diagram of the second pole ear in the battery according to some embodiments of the present utility model.

[0030] Reference Signs:

[0031] Battery 10, battery cell 100, first electrode tab 200, first straight portion 210, first connecting member 220, first main body 230, first arc portion 240, second electrode tab 300, second straight portion 310, second connecting member 320, second main body 330, second arc portion 340, first pole ear 400, first portion 410, second portion 420, first section 430, second section 440, second pole ear 500, third portion 510, fourth portion 520, third section 540, fourth section 550. Detailed implementation manners

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0034] In the description of the present utility model, the meaning of several is more than one, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0035] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0036] In the description of the present utility model, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] In the related art, the battery 10 includes a housing and an electrode core 100. The electrode core 100 is disposed inside the housing. The electrode core 100 is made by a positive electrode plate and a negative electrode plate. Specifically, after the positive electrode plate and the negative electrode plate are respectively manufactured, the positive electrode plate and the negative electrode plate are stacked together, and then the two are wound to form the electrode core 100. Among them, after the power of the battery 10 is used up, the battery 10 needs to be charged. The charging method of the battery 10 is specifically to connect to an external charging device through the ear and charge the electrode core 100. The ears of the existing electrode core 100 are usually disposed at one end of the electrode plate or at the middle position of the electrode plate. However, this still results in a slow charging speed of the battery 10. For this reason, the present application proposes a battery 10.

[0038] Please refer to Figures 1 to 8 , in some embodiments, the battery 10 includes: an electrode core 100, a first ear 400, and a second ear 500. The electrode core 100 is formed by winding the first electrode plate 200 and the second electrode plate 300 after stacking. Before winding the first electrode plate 200 and the second electrode plate 300, both the first electrode plate 200 and the second electrode plate 300 are strip-shaped. After winding the first electrode plate 200, the first electrode plate 200 includes a plurality of first flat portions 210 and a plurality of first arc portions 240. Each end of each first flat portion 210 is respectively connected to two first arc portions 240, and each end of each first arc portion 240 is respectively connected to two first flat portions 210. That is, along the length direction of the first electrode plate 200, the first flat portions 210 and the first arc portions 240 are alternately arranged. Along the thickness direction of the electrode core 100, a plurality of first flat portions 210 are stacked. The specific stacking of a plurality of first flat portions 210 may be that two first flat portions 210 are indirectly connected, and an object such as a separator may be in the middle. The first flat portion 210 includes a first connecting member 220 and a first main body 230. There is no active material layer on the first connecting member 220. A part of the area on the first main body 230 has an active material layer, and a part of the area has no active material layer. The first part 410 may be connected to the area on the first main body 230 where there is no active material layer. The first connecting member 220 is connected to the first main body 230, and the first connecting member 220 protrudes from the first main body 230. A plurality of first connecting members 220 are connected to each other. That is, after the first electrode plate 200 is wound, a plurality of first connecting members 220 are welded together to form a whole. After the second part 420 is electrically connected to the first connecting member 220, current can enter each first connecting member 220 from the second part 420. The first ear 400 includes a first part 410 and a second part 420. The first part 410 and the second part 420 are connected. The first part 410 is connected to the first main body 230, and the second part 420 is connected to the first connecting member 220. The second ear 500 is connected to the second electrode plate 300.

[0039] Specifically, the battery cell 100 includes a first electrode tab 200 and a second electrode tab 300. After the first electrode tab 200 and the second electrode tab 300 are wound, the first electrode tab 200 includes a plurality of first straight portions 210 and a plurality of first arc portions 240. The first arc portions 240 may specifically be the corners of the first electrode tab 200. Among them, the first straight portions 210 include first connecting members 220. There are a plurality of first connecting members 220, and the plurality of first connecting members 220 are connected to each other. The first portion 410 of the first electrode ear 400 is connected to the first main body 230, and the second portion 420 is connected to the first connecting member 220. When the battery 10 is charging, the current can enter the first main body 230 through the first portion 410, and the current can also enter the plurality of first connecting members 220 through the second portion 420 and enter the plurality of first straight portions 210 from the first connecting members 220. In this way, the current can quickly enter each of the first straight portions 210 and the first arc portions 240. That is to say, this shortens the path of the current to each area of the first electrode tab 200, thereby improving the charging speed of the battery 10. Specifically, the battery 10 can have the characteristic of a relatively fast charging speed.

[0040] The following further explains that in the prior art, a region connected to the first electrode ear 400 is provided on the first electrode tab 200, and no active material layer is coated on this region, and the first electrode ear 400 is welded to this region. Among them, after the current enters the first electrode tab 200 through the first electrode ear 400, the path of the current reaching each area of the first electrode tab 200 is relatively long, for example, it needs to go from one end of the first electrode tab 200 to the other end. In this application, after a plurality of first connecting members 220 are provided on the first electrode tab 200, the first connecting members 220 are equivalent to dividing the first electrode tab 200 into a plurality of small segments, and the current can enter each small segment through the first connecting members 220, which can greatly shorten the path of the current reaching each area of the first electrode tab 200, thereby improving the charging speed. In addition, in the prior art, when the battery 10 is charging, the current density at the corners of the battery cell 100 is relatively large, which will cause the problem of lithium deposition in the battery 10. In this application, after the first connecting members 220 are provided, when the current enters from the first electrode ear 400, the current will enter the plurality of first connecting members 220, and the plurality of first connecting members 220 can play a role in shunting, thereby reducing the current density at the corners of the battery cell 100, which can effectively avoid the problem of lithium deposition in the battery 10.

[0041] Further, the first electrode tab 200 can be a positive electrode tab, the first electrode tab 200 can be a negative electrode tab, and the second electrode tab 300 can also be a positive electrode tab or a negative electrode tab. Among them, the number of the first tab 400 and the second tab 500 can both be one. An empty foil area (an area without an active material layer) is provided on the first electrode tab 200 for welding with the first tab 400. The multiple first connectors 220 can be connected to each other by welding. Among them, when manufacturing the first electrode tab 200, the first connectors 220 can be obtained by cutting the foil. In addition, the first tab 400 can be connected to the middle position or the edge position of the first electrode tab 200, and the second tab 500 can be connected to the middle position or the edge position of the second electrode tab 300. When the first tab 400 is located at the middle position of the first electrode tab 200, the charging speed of the battery 10 can be increased, and the high-rate discharge capacity can also be improved.

[0042] Further, please refer to Figure 7 , the structure of the first tab 400 will be specifically introduced below. In some embodiments, the second part 420 includes a first section 430 and a second section 440. The two ends of the second section 440 are respectively connected to the first section 430 and the first part 410, and the first section 430 and the first part 410 are arranged in parallel. The shape of the first tab 400 can be similar to a "U" shape. Among them, after the "U" shape is arranged on the first tab 400 connected to the first electrode tab 200, the current can flow to the first connectors 220 of the first electrode tab 200 respectively, so as to achieve the effects of short current path and low current density. In addition, it should be noted that the first tab 400 includes a first part 410 and a second part 420. Among them, both the first part 410 and the second part 420 can be connected to the area of the first main body 230 without an active material layer, which can effectively improve the connection stability between the first tab 400 and the first tab 400. The tab glue can be provided on the first part 410. After the battery cell 100 is installed in the aluminum plastic film, the tab glue can improve the sealing effect of the aluminum plastic film.

[0043] Further, please refer to Figure 7 , in some embodiments, the distance between the first section 430 and the first part 410 is A, and A≥8mm. Specifically, A can be 8mm, 9mm, 10mm or 12mm, etc. Among them, it can be imagined that the specific way of connecting the second part 420 to the first connector 220 can be that the second part 420 is welded to the first connector 220. Therefore, when the distance between the first section 430 and the first part 410 is less than 8mm, since the distance between the first section 430 and the first part 410 is too small, it will cause a small space when the first connector 220 and the second part 420 are welded, resulting in greater welding difficulty.

[0044] Further, please refer to Figure 7, in some embodiments, the length of the first part 410 is greater than the length of the first section 430. Specifically, the length of the first part 410 being greater than the length of the first section 430 can be in the length direction of the battery cell 100, and the length of the first part 410 is greater than the length of the second part 420. It can be conceived that the first part 410 can be electrically connected to the outside, so as to realize the charging and discharging between the battery 10 and external devices. The second part 420 mainly plays a role in shunting. The length of the second part 420 being less than the length of the first part 410 can improve the energy density of the battery 10. It should be further noted that the battery 10 further includes a housing, the housing can be a steel shell or an aluminum plastic film, the battery cell 100 is placed inside the housing, the second part 420 is arranged inside the housing, and at least part of the first part 410 protrudes outside the housing.

[0045] Further, please refer to Figure 1 , in some embodiments, along the width direction of the battery cell 100, the distance from the first section 430 to the edge of the battery cell 100 is B, and B ≥ 7 mm. Among them, the distance to the edge of the battery cell 100 specifically refers to that the battery cell 100 is square, the battery cell 100 includes two long sides and two short sides, and the edge of the battery cell 100 refers to the short side. Specifically, the distance from the first section 430 to the edge of the battery cell 100 can be 7 mm, 8 mm, 9 mm. When the first section 430 is relatively close to the edge of the battery cell 100, the first section 430 will be relatively close to the corner of the battery cell 100, which will cause the current density at the corner of the battery cell 100 to be too large, resulting in the appearance of the lithium plating problem.

[0046] Further, the specific structures and connection methods of the first electrode sheet 200 and the first electrode tab 400 are introduced above. Now, the specific structures and connection methods of the second electrode sheet 300 and the second electrode tab 500 will be introduced. Please refer to Figures 2 to 8, in some embodiments, the second electrode tab 300 includes a plurality of second flat portions 310 and a plurality of second arc portions 340. Both ends of each second flat portion 310 are respectively connected to two second arc portions 340. That is, along the length direction of the second electrode tab 300, the second flat portions 310 and the second arc portions 340 are alternately arranged. Along the thickness direction of the battery cell 100, a plurality of second flat portions 310 are stacked. Specifically, the plurality of second flat portions 310 being stacked may be that two second flat portions 310 are indirectly connected, and an object such as a separator may be in the middle. The second flat portion 310 includes a second connecting member 320 and a second main body 330. The second connecting member 320 is connected to the second main body 330, and there is no active material layer on the second connecting member 320. The second electrode tab 500 includes a third portion 510 and a fourth portion 520. The third portion 510 is connected to the fourth portion 520, the third portion 510 is connected to the second main body 330, and the fourth portion 520 is connected to the second connecting member 320. There is an active material layer on a part of the area of the second main body 330 and no active material layer on a part of the area. The third portion 510 may be connected to the area of the second main body 330 where there is no active material layer. And the second connecting member 320 protrudes from the second main body 330, and a plurality of second connecting members 320 are connected to each other. That is, after the second electrode tab 300 is wound, a plurality of second connecting members 320 are welded together to form a whole. After the third portion 510 and the second connecting member 320 are electrically connected, current can enter each second connecting member 320 from the third portion 510. Specifically, the second electrode tab 300 includes a plurality of second flat portions 310 and a plurality of second arc portions 340. Both ends of each second flat portion 310 are respectively connected to two second arc portions 340. That is, after the second electrode tab 300 is wound, the second arc portion 340 may be the corner of the second electrode tab 300. A plurality of second connecting members 320 are connected to each other, and the fourth portion 520 of the second electrode tab 500 is connected to the second connecting member 320. Thus, the current flow path can be from the third portion 510 of the second electrode tab 500 into the fourth portion 520. Since the fourth portion 520 is connected to the second connecting member 320, the current can enter a plurality of second connecting members 320 from the fourth portion 520, that is, the current can enter each second flat portion 310 and the second arc portion 340 from the fourth portion 520. Thus, this can shorten the current flow path, reduce the current density at the corner of the battery cell 100, and effectively avoid the problem of lithium deposition in the battery 10. In addition, the charging efficiency of the second electrode tab 300 can also be improved.

[0047] Further, the structure of the second tab 500 will be specifically introduced below. In some embodiments, the fourth part 520 includes a third section 540 and a fourth section 550. Both ends of the fourth section 550 are respectively connected to the third section 540 and the fourth part 520, and the third section 540 and the fourth part 520 are arranged in parallel. The shape of the second tab 500 can be similar to a "U" shape. Among them, after the "U" shape is arranged on the second tab 500 connected to the second tab 300, it can make the current flow to the second tab 300, so as to achieve the effects of a short current path and a low current density. In addition, the second tab 500 can be formed by a cutting process.

[0048] Further, in some embodiments, the length by which the first part 410 protrudes from the battery cell 100 is C, and 12 mm ≤ C ≤ 15 mm. Specifically, the length by which the first part 410 protrudes from the battery cell 100 is 12 mm, 13 mm, 14 mm or 15 mm. Among them, when the length by which the first part 410 protrudes from the battery cell 100 is less than 12 mm, the length by which the first part 410 protrudes from the battery cell 100 is too small. Since tab glue will be provided on the first tab 400, a smaller length will cause difficulties in assembling the battery 10. When the length by which the first part 410 protrudes from the battery cell 100 is greater than 15 mm, the length by which the first part 410 protrudes from the battery cell 100 is too large, which will cause waste of materials and an increase in the cost of the battery 10. It should be noted that the structure of the third part 510 can refer to the structure of the first part 410, that is, the length of the first part 410 is equal to the length of the third part 510.

[0049] Further, please refer to Figure 1 , in some embodiments, the length of the second part 420 is D, and 2.5 mm ≤ D ≤ 3.5 mm. Specifically, the lengths of the second part 420 and the third part 510 can be 2.5 mm, 3 mm, 3.2 mm or 3.5 mm. Among them, when the length of the second part 420 is less than 2.5 mm, due to the small length of the second part 420, it will cause greater difficulty in welding when the second part 420 and the first connector 220 are welded. When the length of the second part 420 is greater than 3.5 mm, it will cause waste of materials and an increase in the cost of the battery 10. It should be noted that the structure of the second tab 500 can be the same as the structure of the first tab 400. Therefore, the length of the fourth part 520 is equal to the length of the second part 420.

[0050] Further, please refer to Figure 1, in some embodiments, along the width direction of the battery cell 100, the distance from the first part 410 to the edge of the battery cell 100 is F, and F≥7 mm. Specifically, the distance to the edge of the battery cell 100 specifically refers to that when the battery cell 100 is square, the battery cell 100 includes two long sides and two short sides, and the edge of the battery cell 100 refers to the short side. The distance from the first part 410 to the edge of the battery cell 100 can be 7 mm, 8 mm, 9 mm. If the first part 410 is too close to the edge of the battery cell 100, then the space between the first part 410 and the edge of the battery cell 100 will be small. Since the second part 420 will be arranged between the first part 410 and the edge of the battery cell 100, therefore, when the space here is too small, it will be difficult to weld the second part 420 and the first connecting piece 220. It should be noted that the structure of the second tab 500 can be the same as the structure of the first tab 400. Therefore, the distance from the first part 410 to the edge of the battery cell 100 can be equal to the distance from the third part 510 to the edge of the battery cell 100.

[0051] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the purpose of the present invention. In addition, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A battery, characterized in that, Comprising: A battery cell, formed by winding after laminating a first pole piece and a second pole piece. The first pole piece includes a plurality of first flat portions and a plurality of first arc portions. Along the length direction of the first pole piece, the first flat portions and the first arc portions are arranged alternately. Along the thickness direction of the battery cell, a plurality of the first flat portions are laminated. The first flat portion includes a first connecting member and a first main body. The first connecting member is connected to the first main body, and the first connecting member protrudes from the first main body. A plurality of the first connecting members are connected to each other; A first pole tab, including a first part and a second part. The first part and the second part are connected. The first part is connected to the first main body, and the second part is connected to the first connecting member; A second pole tab, connected to the second pole piece.

2. The battery according to claim 1, wherein The second part includes a first section and a second section. Two ends of the second section are respectively connected to the first section and the first part. The first section and the first part are arranged in parallel.

3. The battery according to claim 2, wherein The distance between the first section and the first part is A, and A≥8mm.

4. The battery according to claim 2, characterized in that, The length of the first part is greater than the length of the first section.

5. The battery according to claim 2, wherein Along the width direction of the battery cell, the distance from the first section to the edge of the battery cell is B, and B≥7mm.

6. The battery according to claim 1, characterized in that, The second pole piece includes a plurality of second flat portions and a plurality of second arc portions. Along the length direction of the second pole piece, the second flat portions and the second arc portions are arranged alternately. Along the thickness direction of the battery cell, a plurality of the second flat portions are laminated. The second flat portion includes a second connecting member and a second main body. The second connecting member is connected to the second main body, and the second connecting member protrudes from the second main body. A plurality of the second connecting members are connected to each other; The second pole tab includes a third part and a fourth part. The third part is connected to the fourth part. The third part is connected to the second main body, and the fourth part is connected to the second connecting member.

7. The battery according to claim 6, characterized in that, The fourth part includes a third section and a fourth section. Two ends of the fourth section are respectively connected to the third section and the fourth part. The third section and the fourth part are arranged in parallel.

8. The battery according to claim 1, wherein, The length that the first part protrudes from the battery cell is C, and 12mm≤C≤15mm.

9. The battery according to claim 1, characterized in that, The length of the second part is D, and 2.5mm≤D≤3.5mm.

10. The battery according to claim 1, characterized in that, Along the width direction of the battery cell, the distance from the first part to the edge of the battery cell is F, and F≥7mm.

Images