Battery cell and power utilization device

Abstract

The utility model belongs to the technical field of batteries, and discloses a single battery and an electricity utilization device, and the single battery comprises an end cover assembly, a battery cell group and an adapter assembly, the battery cell group comprises a body group and a tab group, the tab group comprises a turnover tab and a laminated tab, and the turnover tab comprises a laminated part and a turnover part; the adapter assembly comprises a first adapter, and the first adapter comprises a first connecting part and a second connecting part; the laminated tab, the laminated part and the first connecting part body group are overlapped and connected on one side in the first direction; and the folding part and the second connecting part are overlapped and connected on one side of the body group in the second direction. The utility model provides a connecting structure of the tab group and the first adapter after the rubbing treatment, which not only facilitates the parallel connection of a plurality of battery cells, but also is beneficial to solving the problem of space utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and an electricity-using device. Background Art

[0002] Generally, the maximum capacity of square lithium iron phosphate batteries on the market is 400Ah, and the maximum capacity of cylindrical batteries does not exceed 100Ah. However, with the rise of new energy cars and new energy public transportation vehicles, the demand for lithium-ion battery capacity is increasing. Therefore, it is necessary to connect at least two battery cells in parallel to form a battery cell group to obtain a large-capacity lithium battery.

[0003] For the connection method of the existing battery tabs and adapters, please refer to Figure 13 It can be seen that the longer tabs are reserved first, and then the tabs are gathered together and bent before being connected to the adapter. In this way, space for the tabs to be gathered needs to be reserved inside the battery, which affects the utilization of the internal space of the battery. Especially when multiple battery cells are connected in parallel, in order to allow the tabs of multiple battery cells to be gathered together, not only more space needs to be reserved inside the battery to accommodate the tabs, but also the tabs of the battery cells at the edge need to be lengthened, which affects the consistency of the battery cells and is not conducive to the production of the battery cells. Utility Model Content

[0004] The purpose of the present utility model is to provide a battery cell and a power setting, design the connection between the stacked portion of the tab group and the stacked tabs and the first connecting portion, the folded portion and the second connecting portion of the tab group, and provide a connection method for the tab group after flattening the tab group and the first adapter, which not only facilitates the parallel connection of multiple battery cells, but also helps solve the problem of space utilization.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, a battery cell is provided, comprising:

[0007] End cap assembly, including pole;

[0008] A battery cell group includes a body group and a tab group, wherein the tab group includes a folded tab and a stacked tab, and the folded tab includes a stacked portion and a folded portion, wherein the stacked portion and the folded portion are connected;

[0009] An adapter assembly, used to connect the pole and the folded tab, the adapter assembly comprising a first adapter, the first adapter comprising a first connecting portion and a second connecting portion connected in sequence;

[0010] The folding portion, the second connecting portion, and the end cover assembly are all located on one side of the body assembly in the second direction, the folding portion is located between the body assembly and the second connecting portion, the second connecting portion is located between the folding portion and the end cover assembly, and the folding portion and the second connecting portion are connected together;

[0011] The stacked tabs, the stacked portion, and the first connecting portion are all located on one side of the main body group in the first direction, and in the second direction, the stacked portion is closer to the end cover assembly than the stacked tabs; the stacked tabs are stacked on the stacked portion, and the stacked portion and the stacked tabs are both connected to the first connecting portion; the first direction and the second direction are perpendicular to each other.

[0012] As an optional technical solution, the adapter assembly also includes a second adapter, the second adapter includes a third connection part and a fourth connection part connected in sequence, the third connection part is located between the folding part and the main body group, the third connection part, the folding part and the second connection part are connected together, and the fourth connection part is connected to the pole.

[0013] As an optional technical solution, an insulating member is provided between the end cover assembly and the body assembly, and at least a portion of the insulating member is limited between the body assembly and the second adapter.

[0014] As an optional technical solution, the second adapter is embedded in the insulating member, and the insulating member has a first side surface facing the end cover assembly, and the first side surface is provided with a first opening and a second opening. The portion of the third connecting portion connected to the folded portion is exposed from the first opening, and the portion of the fourth connecting portion connected to the pole is exposed from the second opening.

[0015] As an optional technical solution, the first side surface includes a first surface and a second surface. In the second direction, the first surface is closer to the body group than the second surface. The first opening is set on the first surface, and the second opening is set on the second surface.

[0016] As an optional technical solution, the battery cell group includes at least two bare battery cells, and the bare battery cells include a body and a tab. The bodies of at least two of the bare battery cells constitute the body group, and the tabs of the same polarity of at least two of the bare battery cells constitute the tab group.

[0017] As an optional technical solution, the end cover assembly includes two poles with opposite polarities, and the two poles are arranged at intervals along the first direction. There are two adapter assemblies and two tab groups, and the two adapter assemblies and the two tab groups are arranged opposite to each other along the first direction.

[0018] As an optional technical solution, two end cover assemblies are provided, and the two end cover assemblies are respectively located at the two ends of the main body group in the second direction, and two adapter assemblies and two tab groups are each provided. The stacking parts in the two tab groups and the first connecting parts in the two adapter assemblies are respectively located at the two ends of the main body group in the first direction, and the folding parts in the two tab groups and the second connecting parts in the two adapter assemblies are respectively located at the two ends of the main body group in the second direction.

[0019] As an optional technical solution, the end cover assembly includes two poles with opposite polarities, and the two poles are arranged at intervals along a third direction. The adapter assembly and the tab group are each provided with two, and the two adapter assemblies and the two tab groups are both arranged at intervals along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0020] In a second aspect, an electrical device is provided, comprising the battery cell as described above.

[0021] Beneficial effects of the utility model:

[0022] In the battery cell of the present invention, the tab group is led out from one end of the body group in the first direction. After the tab group is flattened and bent, the stacked tabs and the stacked parts of the folded tabs are stacked and connected, and the folded parts of the folded tabs are obtained. Then, the stacked tabs and the stacked parts are connected to the first connecting part, and the folded part of the folded tab is connected to the second connecting part. This is not only conducive to the parallel connection of multiple bare battery cells, but also solves the problem of space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the battery pack of the present utility model;

[0024] Figure 2 This is an exploded view of the battery cell of the present utility model;

[0025] Figure 3 This is an exploded view of the battery cell of the present utility model;

[0026] Figure 4 It is a top view of the battery cell of the present utility model;

[0027] Figure 5 It is a right side view of the battery cell of the present utility model;

[0028] Figure 6 It is a cross-sectional view of the insulating member of the present utility model;

[0029] Figure 7This is a front view of the battery cell of the present invention:

[0030] Figure 8 It is a front view of a battery cell of the present utility model;

[0031] Figure 9 It is a top view of the battery cell of the present utility model;

[0032] Figure 10 It is a right side view of the battery cell of the present utility model;

[0033] Figure 11 It is a front view of a battery cell of the present utility model;

[0034] Figure 12 It is a right side view of the battery cell of the present utility model;

[0035] Figure 13 This is a diagram of the connection method between the tabs and adapters of existing battery cells.

[0036] In the picture:

[0037] 1. Cell group; 11. Body group; 12. Tab group; 121. Folded tab; 1211. Lamination part; 1212. Folded part; 122. Lamination tab;

[0038] 21, first adapter; 211, first connecting portion; 212, second connecting portion; 22, second adapter; 221, third connecting portion; 222, fourth connecting portion;

[0039] 3. Insulating member; 31. First side surface; 311. First surface; 312. Second surface; 32. First opening; 33. Second opening;

[0040] 4. End cover; 5. Pole; 6. Shell. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] Example 1

[0046] exist Figure 1 In the embodiment, the tab group 12 of the cell group 1 has not yet been flattened onto the end surface of the body group 11 in the first direction.

[0047] exist Figure 2 In the embodiment, the tab group 12 is flattened on the end surface of the body group 11 in the first direction, and the stacked tab 122 and the stacked portion 1211 of the folded tab 121 are stacked together. At this time, the folded tab 121 has not yet been folded toward the end surface of the body group 11 in the second direction.

[0048] exist Figure 3 In the embodiment, the second adapter 22 is positioned between the folded portion 1212 of the folded tab 121 and the body assembly 11 .

[0049] The end cover assembly is an existing component, and the end cover assembly comprises an end cover 4 and a pole 5 arranged on the end cover 4. The specific connection structure of the end cover assembly will not be described in detail here.

[0050] The shell 6 is an existing component, and is used to enclose the end cover assembly to form a receiving cavity for receiving the battery cell group 1. The shell 6 is provided with a liquid injection hole and an explosion-proof hole connected to the receiving cavity, and an explosion-proof valve is provided at the explosion-proof hole.

[0051] like Figures 1 to 7 As shown, this embodiment provides a battery cell, which includes an end cap assembly, a battery cell group 1 and an adapter assembly. The end cap assembly includes a pole 5; the battery cell group 1 includes a body group 11 and a tab group 12, the tab group 12 includes a folded tab 121 and a stacked tab 122, the folded tab 121 includes a stacked portion 1211 and a folded portion 1212, and the stacked portion 1211 and the folded portion 1212 are connected; the adapter assembly is used to connect the pole 5 and the folded tab 121, and the adapter assembly includes a first adapter 21, and the first adapter 21 includes a first connecting portion 211 and a second connecting portion 212 connected in sequence; wherein the folded portion 1212, the second connecting portion 212 and the end cap assembly are all Located on one side of the main body group 11 in the second direction, the folding portion 1212 is located between the main body group 11 and the second connecting portion 212, the second connecting portion 212 is located between the folding portion 1212 and the end cover assembly, and the folding portion 1212 and the second connecting portion 212 are connected together; the stacked pole ear 122, the stacking portion 1211 and the first connecting portion 211 are all located on one side of the main body group 11 in the first direction, and in the second direction, the stacking portion 1211 is closer to the end cover assembly than the stacked pole ear 122; the stacked pole ear 122 is stacked on the stacking portion 1211, and the stacking portion 1211 and the stacked pole ear 122 are both connected to the first connecting portion 211; the first direction and the second direction are perpendicular to each other.

[0052] Specifically, the tab group 12 is led out from one end of the body group 11 in the first direction, and the tab group 12 is flattened to obtain the stacked tab 122 and the stacked portion 1211 of the folded tab 121, and the stacked tab 122 is stacked on the stacked portion 1211 of the flipped tab 121, and then the flipped tab 121 is bent to obtain the folded portion 1212 of the flipped tab 121, and then the stacked tab 122 and the stacked portion 1211 are both connected to the first connection 211 of the first adapter 21, and the second connection portion 212 of the first adapter 21 is connected to the folded portion 1212. In this way, on the one hand, the tab group 12 is processed by flattening, which is more convenient than connecting multiple bare tabs. The tabs of the battery cells are gathered together and bent and then connected to the adapter, which greatly reduces the space inside the battery occupied by the tab group 12, and there is no need to specially lengthen the tabs of individual bare cells, thereby ensuring the consistency of multiple bare cells and facilitating the parallel connection of multiple bare cells; on the other hand, in order to match the structure of the tab group 12 after flattening to ensure the electrical connection between the tab group 12 and the pole 5, a first adapter 21 is designed, which is not only laser-penetrated and welded to the stacked tabs 122 and the stacked part 1211, but also laser-penetrated and welded to the folded part 1212, so that all the tabs of multiple bare cells can be connected in parallel, ensuring the current transmission channel and improving the rate performance.

[0053] It should be noted that when the tabs are flattened on the end surface of the main body group 11 in the first direction, the flattening direction of the tabs can be selected according to actual needs. For example, all the tabs can be flattened in the same direction, or the tabs can be divided into two parts, and the flattening directions of the tabs of the two parts are opposite; when the folding portion 1212 is connected to the second connecting portion 212, the flip tab 121 that has not been folded can be connected to the second connecting portion 212 and then folded together, or the flip tab 121 and the first adapter 21 can be folded separately, and then the folding portion 1212 and the second connecting portion 212 can be connected.

[0054] It should also be noted that, in order to ensure the connection between the first connecting portion 211 and the stacking portion 1211 as well as the stacking tab 122 , a plurality of weld marks spaced apart along the third direction may be formed on the first connecting portion 211 .

[0055] Furthermore, in order to achieve the purpose of large capacity, the battery cell group 1 includes at least two bare battery cells, the bare battery cells include a body and a tab, the bodies of at least two bare battery cells constitute a body group 11, and the tabs of at least two bare battery cells with the same polarity constitute a tab group 12. Specifically, see Figure 1 In the figure, five bare battery cells are stacked to form a battery cell group 1, each bare battery cell has a body, and the bodies of the five bare battery cells constitute a body group 11. Each bare battery cell has a plurality of tabs extending from both ends of the body along a first direction, and the tabs of the same polarity of the five bare battery cells constitute a tab group 12.

[0056] Furthermore, in order to achieve large capacity while providing a larger battery transmission channel, when the bare battery cell is a stacked battery cell, the stacked battery cell includes multiple positive electrode sheets, multiple negative electrode sheets and a separator arranged between the positive electrode sheets and the negative electrode sheets, wherein, when the stacked battery cell has the electrode ears on the same side, each positive electrode sheet is provided with a positive electrode ear, the width of the positive electrode ear is smaller than the width of the positive electrode sheet, and each negative electrode sheet is provided with a negative electrode ear, the width of the negative electrode ear is smaller than the width of the negative electrode sheet, and when the stacked battery cell has the electrode ears on different sides, each positive electrode sheet is provided with a positive electrode ear, and the width of the positive electrode ear can be equal to the width of the positive electrode sheet, and the width of the negative electrode ear can be equal to the width of the negative electrode sheet.

[0057] In addition, when the bare cell is a wound cell, the wound cell includes a positive electrode sheet, a negative electrode sheet, and a separator arranged between the positive electrode sheet and the negative electrode sheet, wherein, in the wound cell, the number of positive electrode ears can be equal to the number of positive electrode straight sections located at the straight area of ​​the wound cell, and the number of negative electrode ears can be equal to the number of negative electrode straight sections located at the straight area of ​​the wound cell. When the ears are on the same side of the wound cell, the width of the positive electrode ear is smaller than the width of the positive electrode straight section, and the width of the negative electrode ear is smaller than the width of the negative electrode straight section. When the ears are on opposite sides of the stacked cell, the width of the positive electrode ear can be equal to the width of the positive electrode straight section, and the width of the negative electrode ear can be equal to the width of the negative electrode straight section.

[0058] In some embodiments, the adapter assembly also includes a second adapter 22, the second adapter 22 includes a third connection portion 221 and a fourth connection portion 222 connected in sequence, the third connection portion 221 is located between the folding portion 1212 and the main body group 11, the third connection portion 221, the folding portion 1212 and the second connection portion 212 are connected together, and the fourth connection portion 222 is connected to the pole 5.

[0059] The second adapter 22 is arranged on the end surface of the body assembly 11 in the second direction, and the folded portion 1212 is arranged between the third connecting portion 221 of the second adapter 22 and the first connecting portion 211 of the first adapter 21. The folded portion 1212, the third connecting portion 221 and the first connecting portion 211 are connected together by laser penetration welding. Then, the fourth connecting portion 222 of the second adapter 22 and the pole 5 are connected together by laser penetration welding. In this way, on the one hand, the design of the second adapter 22 makes the setting position of the pole 5 on the end cover 4 unaffected by the second connecting portion 212, which is more flexible. On the other hand, compared with laser penetration welding of the pole 5, the second connecting portion 212, the folded portion 1212 and the third connecting portion 221 at the same time, the second connecting portion 212, the folded portion 1212 and the third connecting portion 221 are laser penetration welded, and the fourth connecting portion 222 and the pole 5 are laser penetration welded. By performing laser penetration welding twice, the penetration thickness is reduced, and the welding quality is improved.

[0060] In some embodiments, in order to insulate the battery cell assembly 1 from the adapter assembly, an insulating member 3 is provided between the end cover assembly and the body assembly 11 .

[0061] Specifically, when the adapter assembly only includes the first adapter 21, the insulating part 3 is arranged between the main body group 11 and the folding portion 1212; when the adapter assembly includes the first adapter 21 and the second adapter 22, at least part of the insulating part 3 is arranged between the main body group 11 of the battery cell group 1 and the third connecting portion 221 of the second adapter 22.

[0062] Furthermore, in order to facilitate the arrangement of the insulating part 3 and the second adapter 22, the second adapter 22 is embedded in the insulating part 3, and the insulating part 3 has a first side surface 31 facing the end cover assembly. The first side surface 31 is provided with a first opening 32 and a second opening 33. The portion of the third connecting portion 221 connected to the folding portion 1212 is exposed from the first opening 32, and the portion of the fourth connecting portion 222 connected to the pole 5 is exposed from the second opening 33.

[0063] The second adapter 22 and the insulating member 3 are integrally formed. It is convenient to manufacture by providing the first opening 32 and the second opening 33 on the insulating member 3 at a position opposite to the folded portion 1212 and at a position opposite to the pole 5, respectively. Moreover, since the second adapter 22 and the insulating member 3 are integrally formed, the second adapter 22, the insulating member 3 and the battery cell group 1 are convenient to assemble.

[0064] Furthermore, in order to make full use of the space inside the battery, the first side surface 31 includes a first surface 311 and a second surface 312. In the second direction, the first surface 311 is closer to the body assembly 11 than the second surface 312. The first opening 32 is set on the first surface 311, and the second opening 33 is set on the second surface 312.

[0065] The first surface 311 and the second surface 312 are staggered in a stepped manner. Therefore, the folded portion 1212 , the third connecting portion 221 and the second connecting portion 212 are accommodated in the accommodation space between the first surface 311 and the second surface 312 , thereby fully utilizing the internal space of the battery.

[0066] It should be noted that when the folding portion 1212 , the third connection portion 221 and the second connection portion 212 are arranged in the accommodation space between the first surface 311 and the second surface 312 , the side surface of the second connection portion 212 facing away from the folding portion 1212 can be flush with the second surface 312 .

[0067] Specifically in this embodiment, see Figure 7The end cover assembly includes two poles 5 with opposite polarities, and the two poles 5 are spaced apart along the first direction. Therefore, two adapter assemblies and two tab groups 12 are each provided, and the two adapter assemblies and the two tab groups 12 are arranged opposite to each other along the first direction, wherein one insulating member 3 is provided, and the second adapters 22 in the two adapter assemblies are both embedded in the insulating member 3, and the first side surface 31 of the insulating member 3 is provided with two first openings 32 and two second openings 33, and the two first openings 32 and the two second openings 33 are arranged opposite to each other along the first direction.

[0068] It should be noted that, among the two poles 5 with opposite polarities, one pole 5 serves as a positive pole and the other pole 5 serves as a negative pole; one of the tab groups 12 is composed of positive tabs, and all the positive tabs are led out from one end face of the body group 11 in the first direction; the other tab group 12 is composed of negative tabs, and all the negative tabs are led out from the other end face of the body group 11 in the first direction.

[0069] This embodiment also provides a power setting, which includes the above battery cells.

[0070] Specifically, the electricity usage is set to a category of products such as electric vehicles and mobile phones.

[0071] Example 2

[0072] The basic structure of the battery cell of this embodiment is the same as that of embodiment 1, except that: Figure 11 and Figure 12 There are two end cover assemblies, which are respectively located at the two ends of the main body group 11 in the second direction. Therefore, there are two adapter assemblies and two tab groups 12, and the stacking parts 1211 in the two tab groups 12 and the first connecting parts 211 in the two adapter assemblies are respectively located at the two ends of the main body group 11 in the first direction, the folding parts 1212 in the two tab groups 12 and the second connecting parts 212 in the two adapter assemblies are respectively located at the two ends of the main body group 11 in the second direction, wherein there are two insulating parts 3, the second adapters 22 in the two adapter assemblies are respectively embedded in the two insulating parts 3, and the two insulating parts 3 and the two second adapters 22 are respectively located at the two ends of the main body group 11 in the first direction.

[0073] It should be noted that, in the two end cover assemblies, the pole 5 of one end cover assembly serves as the positive pole, and the end cover assembly is arranged at one end of the main body group 11 in the second direction, and the pole 5 of the other end cover assembly serves as the negative pole, and the end cover assembly is arranged at the other end of the main body group 11 in the second direction; one of the tab groups 12 is composed of positive tabs, and all the positive tabs are led out from one end face of the main body group 11 in the first direction, and the other tab group 12 is composed of negative tabs, and all the negative tabs are led out from the other end face of the main body group 11 in the first direction.

[0074] Example 3

[0075] The basic structure of the battery cell of this embodiment is the same as that of embodiment 1, except that: Figure 8 、 Figure 9 and Figure 10 The end cover assembly includes two poles 5 with opposite polarities, and the two poles 5 are spaced apart along the third direction. Therefore, two adapter assemblies and two tab groups 12 are each provided, and the two adapter assemblies and the two tab groups 12 are spaced apart along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, wherein one insulating member 3 is provided, and the second adapters 22 in the two adapter assemblies are both embedded in the insulating member 3. The first side surface 31 of the insulating member 3 is provided with two first openings 32 and two second openings 33, and the two first openings 32 and the two second openings 33 are arranged opposite to each other along the third direction.

[0076] It should be noted that, among the two poles 5 with opposite polarities, one pole 5 serves as a positive pole and the other pole 5 serves as a negative pole; one of the tab groups 12 is composed of positive tabs and the other tab group 12 is composed of negative tabs, and the negative tabs and the positive tabs are all led out from the same end face of the body group 11 in the first direction.

[0077] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized in that include: An end cap assembly including a pole (5); A battery cell group (1) comprises a body group (11) and a tab group (12), wherein the tab group (12) comprises a folded tab (121) and a stacked tab (122), wherein the folded tab (121) comprises a stacked portion (1211) and a folded portion (1212), and wherein the stacked portion (1211) and the folded portion (1212) are connected; An adapter assembly, used for connecting the pole (5) and the folded pole lug (121), the adapter assembly comprising a first adapter (21), the first adapter (21) comprising a first connecting portion (211) and a second connecting portion (212) connected in sequence; The folding portion (1212), the second connecting portion (212), and the end cover assembly are all located on one side of the body group (11) in the second direction; the folding portion (1212) is located between the body group (11) and the second connecting portion (212); the second connecting portion (212) is located between the folding portion (1212) and the end cover assembly; and the folding portion (1212) and the second connecting portion (212) are connected together; The stacked pole tab (122), the stacked portion (1211) and the first connecting portion (211) are all located on one side of the body group (11) in the first direction; in the second direction, the stacked portion (1211) is closer to the end cover assembly than the stacked pole tab (122); the stacked pole tab (122) is stacked on the stacked portion (1211), and the stacked portion (1211) and the stacked pole tab (122) are both connected to the first connecting portion (211); the first direction and the second direction are perpendicular to each other.

2. The battery cell according to claim 1, wherein: The adapter assembly further includes a second adapter (22), the second adapter (22) including a third connecting portion (221) and a fourth connecting portion (222) connected in sequence, the third connecting portion (221) being located between the folding portion (1212) and the body assembly (11), the third connecting portion (221), the folding portion (1212) and the second connecting portion (212) being connected together, and the fourth connecting portion (222) being connected to the pole (5).

3. The battery cell according to claim 2, characterized in that: An insulating member (3) is provided between the end cover assembly and the body assembly (11), and at least a portion of the insulating member (3) is limited between the body assembly (11) and the second adapter (22).

4. The battery cell according to claim 3, characterized in that The second adapter (22) is embedded in the insulating member (3), and the insulating member (3) has a first side surface (31) facing the end cover assembly, and the first side surface (31) is provided with a first opening (32) and a second opening (33), and the portion of the third connecting portion (221) connected to the folding portion (1212) is exposed from the first opening (32), and the portion of the fourth connecting portion (222) connected to the pole (5) is exposed from the second opening (33).

5. The battery cell according to claim 4, characterized in that The first side surface (31) includes a first surface (311) and a second surface (312); in the second direction, the first surface (311) is closer to the body group (11) than the second surface (312); the first opening (32) is arranged on the first surface (311), and the second opening (33) is arranged on the second surface (312).

6. The battery cell according to claim 1, characterized in that The battery cell group (1) comprises at least two bare battery cells, each of which comprises a body and a tab. The bodies of at least two of the bare battery cells constitute the body group (11), and the tabs of at least two of the bare battery cells with the same polarity constitute the tab group (12).

7. The battery cell according to any one of claims 1 to 6, characterized in that: The end cap assembly comprises two poles (5) with opposite polarities, the two poles (5) are spaced apart along the first direction, two adapter assemblies and two tab groups (12) are each provided, and the two adapter assemblies and the two tab groups (12) are arranged opposite to each other along the first direction.

8. The battery cell according to any one of claims 1 to 6, characterized in that: There are two end cover assemblies, and the two end cover assemblies are respectively located at the two ends of the body group (11) in the second direction. There are two adapter assemblies and two tab groups (12). The stacking parts (1211) in the two tab groups (12) and the first connecting parts (211) in the two adapter assemblies are respectively located at the two ends of the body group (11) in the first direction. The folding parts (1212) in the two tab groups (12) and the second connecting parts (212) in the two adapter assemblies are respectively located at the two ends of the body group (11) in the second direction.

9. The battery cell according to any one of claims 1 to 6, characterized in that: The end cap assembly comprises two poles (5) with opposite polarities, the two poles (5) are spaced apart along a third direction, two adapter assemblies and two tab groups (12) are each provided with two, the two adapter assemblies and the two tab groups (12) are spaced apart along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. Electricity setting, characterized in that, The battery cell comprises the battery cell according to any one of claims 1 to 9.

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