Adapter piece structure

Abstract

The utility model provides an adapter sheet structure, comprising: an adapter sheet body, comprising a top cover connecting part and a tab connecting part which are arranged at an included angle; the top cover connecting part is connected with a pole of the battery cell top cover; the tab connecting part is connected with the top cover connecting part and is obliquely arranged towards the pole; the groove part is formed in the adapter piece body; a transition area is arranged between the tab connecting part and the top cover connecting part, and the groove part is positioned in the transition area and extends linearly; according to the application, the groove part is formed in the transition region of the adapter sheet body, so that the adapter sheet body can be thinned, the fusing performance of the transition region can be enhanced, and when the battery cell is abnormal and the temperature of the adapter sheet body rises to a specified temperature, the transition region can be fused in time, so that the top cover connecting part and the tab connecting part are disconnected, and the battery cell is prevented from being damaged. The damage degree of the battery cell is reduced, and the application safety of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery cells, and particularly to a structure of a connecting piece. Background Art

[0002] The connecting piece is one of the important components in a wound square shell battery cell, used to connect the pole post of the battery cell top cover and the tab of the wound core structure; currently, the connecting pieces used in wound square shell battery cells on the market are usually flat. During the application of the battery cell, if thermal runaway occurs under overcharge, over-discharge, and short-circuit conditions of the battery cell, it is easy to cause damage to the battery cell and pose certain potential safety hazards. Summary of the Utility Model

[0003] In view of this, the purpose of this application is to propose a structure of a connecting piece to solve some or all of the above-mentioned technical problems.

[0004] Based on the above purpose, this application provides a structure of a connecting piece, including:

[0005] A connecting piece body, including a top cover connecting portion and a tab connecting portion arranged at an angle; the top cover connecting portion is connected to the pole post of the battery cell top cover; the tab connecting portion is connected to the top cover connecting portion and is inclined towards the pole post.

[0006] A groove portion is opened on the connecting piece body; a transition region is provided between the tab connecting portion and the top cover connecting portion, and the groove portion is located in the transition region and extends linearly.

[0007] As can be seen from the above, the structure of the connecting piece provided by this application can thin the connecting piece body by opening a groove portion in the transition region of the connecting piece body, thereby enhancing the fusing performance of the transition region; when the battery cell is in an abnormal state such as overcharge, over-discharge, or short-circuit, the temperature of the connecting piece body will continuously rise. When the temperature of the connecting piece body rises to a specified temperature, its transition region can be fused in time to disconnect the top cover connecting portion and the tab connecting portion, thereby protecting the important structure of the battery cell, which is beneficial to reducing the damage degree of the battery cell and improving the safety of battery cell application. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0009] Figure 1 It is a schematic diagram of the structure of the connecting piece from the first perspective in this application;

[0010] Figure 2 It is a cross-sectional view of the adapter plate structure in the first embodiment of the present application;

[0011] Figure 3 For the present application Figure 2 A partial enlarged schematic view of the groove portion;

[0012] Figure 4 It is a cross-sectional view of the adapter plate structure in the second embodiment of the present application;

[0013] Figure 5 For the present application Figure 4 A partial enlarged schematic view of the groove portion;

[0014] Figure 6 It is a schematic view of the adapter plate structure from the second perspective in the present application.

[0015] Explanation of reference numerals:

[0016] 100, adapter plate body; 110, top cover connection part; 120, tab connection part; 130, first protrusion; 140, second protrusion; 150, relief groove;

[0017] 200, groove portion. Detailed implementation manners

[0018] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the following further details the present application in combination with specific embodiments and with reference to the accompanying drawings.

[0019] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those with ordinary skills in the field to which the present application belongs. The "first", "second", and similar terms used in the present application do not indicate any order, quantity, or importance, but are only used to distinguish different components. "Including" or "comprising" and similar terms mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0020] In the field of energy storage, especially for applications such as electric vehicles and energy storage systems, the battery cell, as the core component for energy storage, plays a crucial role. Among them, the wound square battery cell is widely used in the market due to its advantages such as high energy density, good cycle performance, and excellent cost-effectiveness. Usually, the internal structure of the battery cell mainly includes positive and negative electrode materials, separator, and electrolyte, etc. Through precise assembly and winding processes, a wound core structure can be formed. To achieve the electrical connection between the battery cell and the external circuit, a connecting tab is needed to connect the tab of the wound core structure to the terminal of the battery cell top cover, so that the battery cell can be charged and discharged.

[0021] Taking the wound core square battery cell as an example, most of the wound square battery cells on the market use flat connecting tabs. Although the flat connecting tab is easy to manufacture and has a low cost, its limitations are also obvious in practical applications. Specifically, when welding the tab of the battery cell and the connecting tab, due to the narrow operating space between the two, it increases the complexity and difficulty of the tab welding process, and is prone to problems such as poor tab welding or tab position deviation. Moreover, during or after the welding process, the end of the tab is prone to be inserted reversely into the wound core structure, that is, the tab reverse insertion phenomenon, which not only affects the performance of the battery cell, but also may cause safety risks such as short circuit.

[0022] In addition, when the battery cell encounters abnormal conditions such as overcharge, over-discharge, and short circuit, the battery cell is also prone to thermal runaway. In related technologies, the flat connecting tab often lacks an effective thermal runaway protection mechanism. Once thermal runaway occurs, there are not enough measures to suppress the abnormal situation, which will not only cause damage to the battery cell, but also bring serious safety hazards to the entire battery system and even users.

[0023] The following will, through the following specific embodiments and Figures 1 - 6 detail the technical solutions of the present application.

[0024] In view of this, the present application provides a connecting tab structure, including a connecting tab body 100 and a groove portion 200. Among them, the connecting tab body 100 includes a top cover connecting portion 110 and a tab connecting portion 120 arranged at an angle. The top cover connecting portion 110 is connected to the terminal of the battery cell top cover. The tab connecting portion 120 is connected to the top cover connecting portion 110 and is inclined towards the terminal. The groove portion 200 is opened on the connecting tab body 100. There is a transition region between the tab connecting portion 120 and the top cover connecting portion 110, and the groove portion 200 is located in the transition region and extends linearly.

[0025] Figure 1 is a schematic diagram of the connecting tab structure from the first perspective in the present application, Figure 2 is a cross-sectional view of the connecting tab structure in the first embodiment of the present application, Figure 4 is a cross-sectional view of the connecting tab structure in the second embodiment of the present application.

[0026] As Figure 1 , Figure 2 and Figure 4 shown, the present application provides a connecting piece structure applied to an electric core. Among them, the connecting piece structure includes a connecting piece body 100 and a groove portion 200. For the connecting piece body 100, the connecting piece body 100 includes a top cover connecting portion 110 and an ear connecting portion 120. Among them, the top cover connecting portion 110 is connected to a pole column provided on the top cover of the electric core so as to be connected to an external circuit structure through the pole column; the ear connecting portion 120 is connected to the top cover connecting portion 110 so as to form a connection relationship between the two, thereby realizing the transmission of electric energy. And for the top cover connecting portion 110 and the ear connecting portion 120, an included angle is provided between the top cover connecting portion 110 and the ear connecting portion 120, so that the two are not in the same plane, and the ear connecting portion 120 is inclined towards the pole column, which can increase the distance between the ear connecting portion 120 and the winding core structure and expand the space formed between the two. On the one hand, as the distance between the two increases, a larger operating space can be provided, which is beneficial to improving the welding quality and welding accuracy of the ear on the surface of the ear connecting portion 120, and at the same time is also beneficial to reducing the welding difficulty of the ear. On the other hand, since the ear connecting portion 120 is inclined towards the side of the top cover of the electric core, the end of the ear after welding will also shift towards the side close to the top cover of the electric core, which is beneficial to reducing the probability of the ear being inserted upside down into the winding core structure and improving the overall safety of the electric core.

[0027] In addition, the adapter sheet structure provided by the present application further includes a groove portion 200; specifically, since the adapter sheet body 100 includes a top cover connection portion 110 and a tab connection portion 120, a transition region can be formed between the top cover connection portion 110 and the tab connection portion 120. The groove portion 200 can be opened on the adapter sheet body 100 and linearly extend within the transition region, thereby dividing the top cover connection portion 110 and the tab connection portion 120; wherein, by opening the groove portion 200 on the adapter sheet body 100, the transition region can be thinned. When the tab connection portion 120 and the top cover connection portion 110 are integrally formed, a linear groove portion 200 is opened in the transition region, which is convenient for bending the tab connection portion 120 so that an included angle is formed between the top cover connection portion 110 and the tab connection portion 120; in addition, since the groove portion 200 is provided in the transition region, the adapter sheet body 100 can be thinned, so that the thickness of the transition region is reduced. When abnormal conditions such as overcharging, over-discharging, and short circuit occur in the battery cell, it is easy to cause problems such as thermal runaway of the battery cell or current overload, and it is easy to cause the temperature of the adapter sheet body 100 to rise; since the thickness of the transition region provided with the groove portion 200 is relatively thin, when the adapter sheet body 100 reaches a specified temperature, the transition region provided with the groove portion 200 will fuse first, so that the tab connection portion 120 and the top cover connection portion 110 are disconnected, which is beneficial to reducing the damage degree of the battery cell and reducing the safety hazards of the battery cell and even the battery during application.

[0028] It should be noted that the adapter sheet body 100 is further described in combination with the above embodiments; since the adapter sheet body 100 includes a top cover connection portion 110 and a tab connection portion 120, and the two are respectively connected to the terminal post and the tab, the adapter sheet body 100 can adopt an integrated design. By means of a bending process, an included angle can be formed between the top cover connection portion 110 and the tab connection portion 120; it can also adopt a split design, and the top cover connection portion 110 and the tab connection portion 120 can be welded by a welding process, and a corresponding included angle is provided between the two during welding to meet the connection relationship between the top cover connection portion 110 and the tab connection portion 120; in addition, the adapter sheet body 100 can be formed of one material such as stainless steel, carbon steel, aluminum alloy, and copper alloy, so that the adapter sheet body 100 has good corrosion resistance and high use strength, and at the same time has excellent electrical conductivity, which is beneficial to improving the service life and charge and discharge performance of the battery cell.

[0029] In some embodiments, the groove portion 200 is opened on one side of the adapter sheet body 100 close to the battery cell top cover, and the opening of the groove portion 200 faces the terminal post; there is a distance between two opposite side surfaces in the groove portion 200.

[0030] Figure 3 For the present application Figure 2Partial enlarged schematic diagram of the middle groove portion 200;

[0031] As Figure 2 and Figure 3 shown, with respect to the groove portion 200, by providing the groove portion 200 in the transition region of the adapter plate body 100, the transition region can be thinned and used as a thermal runaway protection mechanism for the battery cell; when an abnormal condition occurs in the adapter plate body 100 and the temperature rises to a specified temperature, the adapter plate body 100 provided with the groove portion 200 will fuse, so that the top cover connection portion 110 and the tab connection portion 120 are fused and separated, thereby achieving overcurrent protection for the battery cell and reducing the degree of damage to the battery cell; specifically, as Figure 2 shown, the groove portion 200 can be provided on the side of the adapter plate body 100 close to the battery cell top cover, and the opening of the groove portion 200 is arranged facing the pole column, so as to reduce the thickness of the transition region, so as to adjust the included angle between the tab connection portion 120 and the top cover connection portion 110, and make the tab connection portion 120 inclined towards the pole column; in addition, when the top cover connection portion 110 and the tab connection portion 120 are arranged at an included angle, in order to achieve the purpose of thinning the transition region by using the groove portion 200, it is also necessary to make there be a spacing between the two opposite sides in the groove portion 200 to avoid short - circuiting between the opposite sides in the groove portion 200 corresponding to the top cover connection portion 110 and the tab connection portion 120, and to ensure that the transition region can fuse under abnormal conditions of the battery cell, so as to reduce the degree of damage to the battery cell and achieve protection for the battery cell.

[0032] Further illustrate the groove portion 200 in combination with the above - mentioned embodiments; as Figure 3 shown, assume the thickness of the adapter plate body is D1. For the cross - section of the groove portion 200 perpendicular to its extending direction, assume the cross - section width of the groove portion 200 is X1 and the cross - section depth is Y1; wherein, the thickness of the adapter plate body 100 can be set to 8 mm - 10 mm, that is, D1 can be any value within 8 mm - 10 mm, the cross - section width of the groove portion 200 can be set to 2 mm - 4 mm, that is, X1 can be any value within 2 mm - 4 mm, and the cross - section depth of the groove portion 200 can be set to 2 mm - 4 mm, that is, Y1 can be any value within 2 mm - 4 mm, so as to ensure that there is good firmness and reliability between the top cover connection portion 110 and the tab connection portion 120 during normal use of the battery cell, and to ensure that the adapter plate body 100 has good electrical conductivity, which will not be elaborated here.

[0033] In some embodiments, the groove portion 200 is provided on the side of the adapter plate body 100 facing away from the battery cell top cover, and the opening of the groove portion 200 is arranged facing away from the pole column.

[0034] Figure 5 This is Figure 4 the partial enlarged schematic diagram of the groove portion 200 in this application.

[0035] As Figure 4 and Figure 5 shown, when the battery cell is in an abnormal state, the temperature of the adapter plate body 100 provided with the groove portion 200 rises, and when the adapter plate body 100 reaches a specified temperature, the transition region will fuse, so that the top cover connection portion 110 and the tab connection portion 120 are fused and separated to protect the battery cell, thereby reducing the damage degree of the battery cell and improving the application safety of the battery cell; As Figure 4 shown, the groove portion 200 can be provided on the side of the adapter plate body 100 away from the battery cell top cover, and the opening of the groove portion 200 is arranged away from the pole column, for thinning the transition region of the adapter plate body 100, so as to adjust the included angle between the tab connection portion 120 and the top cover connection portion 110, so that the tab connection portion 120 inclines towards the pole column; Since the groove portion 200 is provided on the side of the transition region away from the pole column, when the top cover connection portion 110 and the tab connection portion 120 are arranged at an included angle, there is no risk of mutual abutment on the opposite sides in the groove portion 200, and when the adapter plate body 100 reaches a specified temperature, its transition region can fuse at the specified temperature, thereby realizing the protection of the battery cell.

[0036] The groove portion 200 will be further described in combination with the above embodiments; As Figure 5 shown, let the thickness of the adapter plate body be D2, and for the cross-section of the groove portion 200 perpendicular to its extending direction, let the cross-sectional width of the groove portion 200 be X2 and the cross-sectional depth be Y2; Among them, the thickness of the adapter plate body 100 can be set to 8 mm - 10 mm, that is, D2 is any value in 8 mm - 10 mm, the cross-sectional width of the groove portion 200 can be set to 2 mm - 4 mm, that is, X2 is any value in 2 mm - 4 mm, and the cross-sectional depth of the groove portion 200 can be set to 2 mm - 4 mm, that is, Y2 is any value in 2 mm - 4 mm, to ensure that there is good firmness and reliability between the top cover connection portion 110 and the tab connection portion 120 when the battery cell is in normal use, and to ensure that the adapter plate body 100 has good electrical conductivity, which will not be elaborated here.

[0037] In some embodiments, the included angle formed between the plane where the top cover connection portion 110 is located and the plane where the tab connection portion 120 is located is 5° - 30°.

[0038] As Figures 2 - 5As shown, an included angle is formed between the top cover connection part 110 and the tab connection part 120, and the tab connection part 120 is inclined towards the terminal post, increasing the distance between the tab connection part 120 and the core structure and forming a larger space. This can not only reduce the installation difficulty of the adapter plate body 100, improve the welding quality and accuracy of the tabs, but also reduce the probability of the tabs being inserted backwards into the core structure, improving the overall safety of the battery cell. Among them, by setting the included angle between the top cover connection part 110 and the tab connection part 120 to be 5° - 30°, sufficient stretching space can be provided for the tabs, and at the same time, it will not cause major changes to the adapter plate body 100.

[0039] For example, as Figure 3 shown, let the acute angle formed by the top cover connection part 110 and the tab connection part 120 be α1. Therefore, the range of the included angle formed between the two can be set to 5° - 30°, that is, α1 can be any angle value within 5° - 30°. Another example, as Figure 5 shown, let the acute angle formed by the top cover connection part 110 and the tab connection part 120 be α2. Therefore, the range of the included angle formed between the two can be set to 5° - 30°, that is, α2 can be any angle value within 5° - 30°, which will not be elaborated here.

[0040] In some embodiments, the cross-section of the groove part 200 perpendicular to its extending direction is V-shaped or arc-shaped. Specifically, for the groove part 200, by setting the cross-section of the groove part 200 to be V-shaped or arc-shaped, the difficulty of opening the groove part 200 can be reduced. When the top cover connection part 110 and the tab connection part 120 form an included angle, the opposite sides of the groove part 200 are not likely to come into contact, so that the top cover connection part 110 and the tab connection part 120 can be melted when reaching the specified temperature, which is beneficial to ensuring the safety of the battery cell.

[0041] In some embodiments, there are two tab connection parts 120, and the two tab connection parts 120 are symmetrically distributed on the opposite sides of the top cover connection part 110. As Figure 1 shown, for the battery cell, the core structure may include a positive tab and a negative tab. When constructing the connection relationship, the positive tab and the negative tab need to be connected to the terminal post through the adapter plate body 100. Therefore, there can be two tab connection parts 120, one of which is connected to the positive tab and the other is connected to the negative tab to construct an electric energy transmission circuit in the battery cell. In addition, by making the two tab connection parts 120 symmetrically distributed on the opposite sides of the top cover connection part 110, the overall aesthetic degree of the adapter plate body 100 can be improved, facilitating the welding of the positive tab and the negative tab.

[0042] In some embodiments, along the extending direction of the groove portion 200, the groove portion 200 penetrates through the transition region; by providing the groove portion 200 in the transition region of the adapter plate body 100 and making the groove portion 200 penetrate through the transition region along the extending direction of the groove portion 200, the consistency of the transition region can be improved, ensuring that when the adapter plate body 100 is in an abnormal state and reaches a specified temperature, the top cover connection portion 110 and the tab connection portion 120 can be fully melted, avoiding incomplete melting between the bottom cover connection portion and the tab connection portion 120 and causing damage to the battery cell.

[0043] In some embodiments, the adapter plate body 100 further includes a plurality of first protrusions 130, and the plurality of first protrusions 130 are arranged in an array on the side of the tab connection portion 120 facing away from the battery cell top cover to form a first welding area, and the orthographic projection of the first welding area on the tab connection portion 120 is located within the tab connection portion 120.

[0044] As Figure 1 shown, for the adapter plate body 100, the adapter plate body 100 is connected to the pole column through the top cover connection portion 110 and is connected to the tab of the wound core structure through the tab connection piece, thereby constructing an electric energy transmission circuit in the battery cell to transmit electric energy; specifically, the adapter plate body 100 further includes a plurality of first protrusions 130 arranged in an array on the side of the tab connection portion 120 facing away from the battery cell top cover, and a first welding area is formed on the surface of the tab connection plate. Among them, by providing the first welding area, the friction force of the tab connection portion 120 on the tab during the welding process can be increased, which is beneficial to improving the welding tensile force and ensuring the welding effect of the tab on the surface of the tab connection portion 120; in addition, the orthographic projection of the first welding area on the tab connection portion 120 is located within the tab connection portion 120. For example, the length of the tab connection portion 120 can be set to be greater than or equal to 1.2 - 1.5 times the length of the first welding area, and the width of the tab connection portion 120 can be set to be greater than or equal to 1.2 - 1.5 times the width of the first welding area, ensuring that the tab is fully welded to the surface of the tab connection portion 120 through the first protrusions 130, which is beneficial to improving the firmness and welding quality of the welding.

[0045] In some embodiments, the adapter plate body 100 further includes a plurality of second protrusions 140, and the plurality of second protrusions 140 are arranged in an array on the side of the top cover connection portion 110 close to the battery cell top cover to form a second welding area, and the orthographic projection of the second welding area on the top cover connection portion 110 is located within the top cover connection portion 110; the pole column is connected to the top cover connection portion 110 through the second protrusions 140.

[0046] Figure 6 This is a schematic diagram of the adapter plate structure from the second perspective in this application.

[0047] Specifically, as Figure 6As shown, the adapter sheet body 100 further includes a plurality of second protrusions 140 arranged in an array on the side of the top cover connection part 110 close to the battery cell top cover, and a second welding area is formed on the surface of the tab connection plate; among them, by using the second welding area formed by the plurality of second protrusions 140, the friction between the top cover connection part 110 and the pole column during the welding process can be increased, which is beneficial to improving the welding tensile force and ensuring that the pole column is fully welded to the surface of the top cover connection part 110; in addition, the orthographic projection of the second welding area on the top cover connection part 110 is located within the top cover connection part 110. For example, the length of the top cover connection part 110 can be set to be greater than or equal to 1.2 - 1.5 times the length of the first welding area, and the width of the top cover connection part 110 can be set to be greater than or equal to 1.2 - 1.5 times the width of the first welding area, ensuring that the tab is fully welded to the surface of the top cover connection part 110 through the second protrusions 140, which is beneficial to improving the welding firmness and welding quality.

[0048] In some embodiments, the adapter sheet body 100 further includes a relief groove 150, and the relief groove 150 is formed in the adapter sheet body 100 and is recessed toward the top cover connection part 110; the relief groove 150 is located between the two tab connection parts 120.

[0049] As Figure 1 and Figure 6 shown, the adapter sheet further includes a relief groove 150. Regarding the relief groove 150, it can reduce the space occupied by the adapter sheet body 100 inside the battery cell, avoid obstruction during the inspection or maintenance of the battery cell, which is beneficial to reducing the maintenance difficulty of the battery cell and improving the convenience of maintaining the battery cell; among them, the relief groove 150 is formed in the adapter sheet body 100 and is recessed toward the top cover connection part 110, and is located between the two tab connection parts 120 at the same time. Therefore, the relief groove 150 can reduce the connection area between the top cover connection part 110 and the tab connection part 120, and can shorten the extension length of the groove part 200, so that on the premise that the adapter sheet body 100 has good electrical conductivity, the top cover connection part 110 and the tab connection part 120 are more likely to melt at a specified temperature, which is beneficial to improving the protection effect of the adapter sheet structure on the battery cell.

[0050] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above, and they are not provided in detail for the sake of brevity.

[0051] Embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A transfer sheet structure, characterized in that: include: The adapter body comprises a top cover connection part and a pole ear connection part which are arranged at an angle; the top cover connection part is connected to the pole of the top cover of the battery cell; the pole ear connection part is connected to the top cover connection part and is arranged obliquely toward the pole; A groove portion is provided in the adapter body; a transition area is provided between the tab connection portion and the top cover connection portion, and the groove portion is located in the transition area and extends linearly.

2. The adapter structure according to claim 1, characterized in that: The groove portion is arranged on a side of the adapter plate body close to the battery cell top cover, and the opening of the groove portion is arranged toward the pole; and a distance is provided between two opposite side surfaces in the groove portion.

3. The adapter sheet structure according to claim 1, characterized in that: The groove portion is arranged on a side of the adapter plate body away from the battery cell top cover, and an opening of the groove portion is arranged away from the pole.

4. The adapter structure according to claim 1, characterized in that: The angle formed between the plane where the top cover connecting portion is located and the plane where the pole tab connecting portion is located is 5°-30°.

5. The adapter structure according to claim 1, characterized in that: The cross section of the groove portion perpendicular to its extending direction is V-shaped or arc-shaped.

6. The adapter structure according to claim 1, characterized in that: The two tab connection parts are provided with two tab connection parts, and the two tab connection parts are symmetrically distributed on opposite sides of the top cover connection part.

7. The adapter sheet structure according to claim 1, characterized in that: Along the extending direction of the groove portion, the groove portion is arranged to penetrate the transition area.

8. The adapter sheet structure according to claim 1, characterized in that: The adapter body further includes: A plurality of first protrusions are arranged in an array on a side of the tab connection portion away from the cell top cover to form a first welding area, and an orthographic projection of the first welding area on the tab connection portion is located inside the tab connection portion.

9. The adapter sheet structure according to claim 1, characterized in that: The adapter body further includes: A plurality of second protrusions are arranged in an array on one side of the top cover connecting portion close to the top cover of the battery cell and form a second welding area, and the orthographic projection of the second welding area on the top cover connecting portion is located inside the top cover connecting portion; the pole is connected to the top cover connecting portion through the second protrusions.

10. The adapter structure according to claim 6, characterized in that: The adapter body further includes: A clearance groove is provided in the adapter body and is recessed toward the top cover connection portion; the clearance groove is located between the two tab connection portions.

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