Adapter piece, battery monomer and battery

Abstract

The utility model provides a switching piece, a battery monomer and a battery, the switching piece comprises a first welding printing part, a second welding printing part and a current path part, and the first welding printing part is used for being electrically connected with an electrode terminal of the battery monomer; the second welding printing part is used for being electrically connected with a tab of a battery monomer; the current path portion is connected between the first solder print portion and the second solder print portion, and the current path portion is a region formed at a minimum resistance where a current flows between the first solder print portion and the second solder print portion. According to the invention, the switching sheet is provided with the first welding printing part electrically connected with the electrode terminal and the second welding printing part electrically connected with the tab, and the current path part of the switching sheet is arranged to be an area between the first welding printing part and the second welding printing part at the minimum resistance for current circulation, so that the utilization rate of the whole switching sheet is improved; the overall structure of the switching piece is reduced, the using amount of switching piece materials is reduced, the cost is reduced, meanwhile, the overall weight of the switching piece is reduced, and the energy density of the single battery is also improved.

Description

Technical Field

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

[0002] The tabs of the battery cell are connected to the electrode terminals through adapters. With the development of battery technology, people have put forward higher requirements for the structural design of adapters. In the related art, the overall structure of the adapter is relatively large, resulting in a heavy weight and high cost, which affects the energy density of the battery cell. Utility Model Content

[0003] The purpose of the present application is to provide an adapter, a battery cell and a battery to solve the technical problems of the prior art that the adapter has a large structure and high cost.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] In a first aspect, the present application provides a transfer sheet, comprising: a first weld print portion, a second weld print portion and a current path portion, wherein the first weld print portion is used to electrically connect to the electrode terminal of a battery cell; the second weld print portion is used to electrically connect to the tab of the battery cell; the current path portion is connected between the first weld print portion and the second weld print portion, and the current path portion is a region formed at the minimum resistance where current flows between the first weld print portion and the second weld print portion.

[0006] In one or more embodiments of the present application, the first weld print portion is the area that is in welding contact with the electrode terminal; the second weld print portion is the area that is in welding contact with the tab; and the current path portion is the area formed by a set of straight lines connecting any point on the first weld print portion and any point on the second weld print portion.

[0007] In one or more embodiments of the present application, the second weld print portion includes at least two, and the current path portion is an area formed by a collection of straight lines connecting any point on the first weld print portion and any point on any second weld print portion; or

[0008] The first welding marks include at least two, and the current path portion is a region formed by a collection of straight lines connecting any point on the second welding marks and any point on any first welding marks.

[0009] In one or more embodiments of the present application, the first welding portions include at least two, the second welding portions include at least two, and the current path portion is an area formed by a set of straight lines connecting any point on any first welding portion and any point on any second welding portion.

[0010] In one or more embodiments of the present application, in the thickness direction, the thickness of the first weld print portion is 0.3 to 1.5 mm, and / or,

[0011] The thickness of the second weld print portion is 0.3 to 1.5 mm, and / or

[0012] The thickness of the current path portion is 0.3 to 1.5 mm.

[0013] In one or more embodiments of the present application, the thickness of the current path portion gradually decreases from the middle to both ends.

[0014] In one or more embodiments of the present application, in the thickness direction of the first weld print portion, the thickness of the first weld print portion is consistent; and / or,

[0015] In the thickness direction of the second weld print portion, the thickness of the second weld print portion is consistent.

[0016] In one or more embodiments of the present application, the conductivity of the adapter is greater than 30 mS / m.

[0017] In a second aspect, the present application further provides a battery cell, comprising: an electrode terminal, a pole tab, and the adapter sheet described in the first aspect, wherein the adapter sheet is used to connect the electrode terminal and the pole tab.

[0018] In a third aspect, the present application further provides a battery, comprising the battery cell described in the second aspect.

[0019] Based on the above technical solution, the adapter, battery cell and battery provided by the present application have at least the following beneficial technical effects:

[0020] The present application provides a transfer sheet including a first weld print, a second weld print and a current path, wherein the first weld print is used to electrically connect to the electrode terminal of a battery cell; the second weld print is used to electrically connect to the tab of a battery cell; the current path is connected between the first weld print and the second weld print, and the current path is a region formed at the minimum resistance of the current flowing between the first weld print and the second weld print. The present application sets the transfer sheet to have a first weld print electrically connected to the electrode terminal and a second weld print electrically connected to the tab, and sets the current path of the transfer sheet to be a region at the minimum resistance of the current flowing between the first weld print and the second weld print, thereby improving the utilization rate of the entire transfer sheet, reducing the overall structure of the transfer sheet, reducing the amount of materials used in the transfer sheet, and reducing costs. At the same time, the overall weight of the transfer sheet is reduced, and the energy density of the battery cell is also improved.

[0021] The battery cell provided in the embodiment of the present application comprises an electrode terminal, a tab and the adapter, wherein the adapter is used to connect the electrode terminal and the tab. Since the overall weight of the adapter is reduced, the energy density of the battery cell can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the structure of the adapter in the battery cell of the related technology;

[0024] Figure 2 is a schematic diagram of a top view of the structure of an adapter sheet of one or more embodiments of the present application;

[0025] Figure 3 is a schematic diagram of a top view of the structure of an adapter sheet of one or more embodiments of the present application;

[0026] Figure 4 yes Figure 3 A schematic diagram of the design of the adapter sheet of the illustrated embodiment;

[0027] Figure 5 is a schematic diagram of a top view of the structure of an adapter sheet of one or more embodiments of the present application;

[0028] Figure 6 is a schematic diagram of a top view of the structure of an adapter sheet of one or more embodiments of the present application;

[0029] Figure 7 is a schematic diagram of a top view of the structure of an adapter sheet of one or more embodiments of the present application;

[0030] Figure 8 yes Figure 7 A schematic diagram of the design of the adapter sheet of the illustrated embodiment;

[0031] Fig. 9 is a schematic diagram of a top view of the structure of an adapter sheet of one or more embodiments of the present application;

[0032] Figures 10 to 14 yes Fig. 9 A schematic diagram of the design of the adapter sheet of the illustrated embodiment;

[0033] Fig.15 is a schematic diagram of the longitudinal cross-sectional structure of the current path portion of the adapter sheet of one or more embodiments of the present application;

[0034] Fig.16 It is a schematic diagram of the longitudinal cross-sectional structure of the current path portion of the adapter sheet of one or more embodiments of the present application.

[0035] In the figure: 1-electrode assembly; 2-adapter; 11-top cover; 12-ear; 21-first weld stamp; 22-second weld stamp; 23-current path; 24-electrode terminal welding area; 25-ear welding area. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] The battery cell includes a shell, a top cover 11 for sealing the shell, and an electrode assembly 1 located in the shell, wherein the electrode assembly 1 includes a tab 12, and the top cover 11 is provided with an electrode terminal, a part of which is located on one side of the inner surface of the top cover 11 and can be electrically connected to the tab 12 of the electrode assembly 1 through an adapter 2, for outputting or inputting electrical energy of the battery cell. Figure 1As shown, the body of the adapter sheet 2 in the prior art almost covers the electrode terminal and the tab 12, one end of the adapter sheet 2 is connected to the electrode terminal on the top cover 11, and forms an electrode terminal welding area 24 with the electrode terminal, and the other end of the adapter sheet 2 is connected to the tab 12 of the electrode assembly, and forms a tab welding area 25 with the tab 12. So that the electrode terminal can be electrically connected to the tab 12 of the electrode assembly through the adapter sheet 2. The overall structure of the existing adapter sheet 2 is relatively large, resulting in a heavy weight of the adapter sheet 2, a high cost, and also affecting the energy density of the battery cell.

[0041] Based on the above considerations, in order to solve the technical problems of large adapter structure and high cost in the prior art, the present application provides an adapter, including a first weld print portion, a second weld print portion and a current path portion, the first weld print portion is used to electrically connect to the electrode terminal of the battery cell; the second weld print portion is used to electrically connect to the pole ear of the battery cell; the current path portion is connected between the first weld print portion and the second weld print portion, and the current path portion is a region formed at the minimum resistance for current flowing between the first weld print portion and the second weld print portion.

[0042] In the technical solution of the embodiment of the present application, the adapter sheet is provided with a first weld print portion electrically connected to the electrode terminal and a second weld print portion electrically connected to the tab, and the current path portion of the adapter sheet is provided in a region at a minimum resistance of current flow between the first weld print portion and the second weld print portion, thereby improving the utilization rate of the entire adapter sheet, reducing the overall structure of the adapter sheet, reducing the amount of adapter sheet material used, and reducing the cost. At the same time, the overall weight of the adapter sheet is reduced, and the energy density of the battery cell is improved.

[0043] The adapter of the present application can be applied to battery cells, batteries and electric devices using batteries. Battery cells can be used in electric devices using batteries as power sources or various energy storage systems using batteries as energy storage elements. Electric devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0044] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0045] Please refer to Figure 2The embodiment of the present application provides a transfer sheet, including: a first weld portion 21, a second weld portion 22 and a current path portion 23, the first weld portion 21 is used to be electrically connected to the electrode terminal of the battery cell; the second weld portion 22 is used to be electrically connected to the tab of the battery cell; the current path portion 23 is connected between the first weld portion 21 and the second weld portion 22, and the current path portion 23 is a region formed at the minimum resistance where the current flows between the first weld portion 21 and the second weld portion 22.

[0046] Among them, the first weld print portion 21 refers to the welding area between the adapter and the electrode terminal. It can be understood that the first weld print portion 21 is the welding area with the electrode terminal as a whole, and does not include the non-welding area. The second weld print portion 22 refers to the welding area between the adapter and the pole ear. It can be understood that the second weld print portion 22 is the welding area with the pole ear as a whole, and does not include the non-welding area. The electrode terminal can be a pole arranged on the top cover 11 of the battery cell, and the electrode terminal can be a positive pole or a negative pole. The current path portion 23 is a structure for connecting the first weld print portion 21 and the second weld print portion 22, and the current path portion 23 is the area of ​​minimum resistance to the current between the first weld print portion 21 and the second weld print portion 22. In some embodiments, the first weld print portion 21, the second weld print portion 22 and the current path portion 23 can be an integrated structure.

[0047] In the technical solution of the embodiment of the present application, the adapter is provided with a first weld portion 21 electrically connected to the electrode terminal and a second weld portion 22 electrically connected to the tab 12, and the current path portion 23 of the adapter is provided in the area where the minimum resistance of the current flows between the first weld portion 21 and the second weld portion 22, thereby improving the utilization rate of the entire adapter, reducing the overall structure of the adapter, reducing the amount of adapter material used, reducing the cost, and reducing the overall weight of the adapter, thereby improving the energy density of the battery cell.

[0048] In one or more embodiments of the present application, the first weld mark 21 is the area that is in welding contact with the electrode terminal; the second weld mark 22 is the area that is in welding contact with the tab; and the current path portion 23 is an area formed by a set of straight lines connecting any point on the first weld mark 21 and any point on the second weld mark 22.

[0049] Among them, welding contact can be understood as the contact between the two due to welding. According to the calculation method of resistance, R=ρL / s, where ρ is the resistivity of the material, L represents the length of the material, and s is the cross-sectional area. Under the condition of the same thickness, that is, the same cross-sectional area, and the same material, that is, the same resistivity, the smaller L is, the smaller the resistance R is, and the length L of the straight line is the smallest. Therefore, the area formed by the set of connecting straight lines of any point on the first weld print 21 and any point on the second weld print 22 is also the area of ​​minimum resistance for current flowing between the first weld print 21 and the second weld print 22.

[0050] In the technical solution of the embodiment of the present application, the first weld print 21 is the area in welding contact with the electrode terminal, the second weld print 22 is the area in welding contact with the tab, and the current path 23 is the area formed by the collection of connecting straight lines of any point on the first weld print 21 and any point on the second weld print 22, so that the current path 23 is the area with the minimum resistance for the current to flow between the first weld print 21 and the second weld print 22, that is, the current concentration area. As a result, the overall structure of the adapter becomes smaller, the utilization rate of the adapter is improved, the amount of adapter material used is reduced, the cost is reduced, and the overall weight of the adapter is reduced, which also improves the energy density of the battery cell.

[0051] In one or more embodiments of the present application, Figure 2 As shown, Figure 2 A schematic diagram showing the structure of an adapter sheet of one or more embodiments is shown. Figure 2 In the illustrated embodiment, when the adapter is connected to a pole ear and an electrode terminal, at this time, the adapter has a first weld print portion 21, a second weld print portion 22, and a current path portion 23 connected between the first weld print portion 21 and the second weld print portion 22, and the current path portion 23 is an area formed by a collection of straight lines connecting any point on the first weld print portion 21 and any point on the second weld print portion 22.

[0052] In one or more embodiments of the present application, Figure 3 , Figure 5 and Figure 6 As shown, Figure 3 , Figure 5 and Figure 6 A schematic diagram of the structure of the adapter sheet of one or more embodiments of the present application is shown, the second welding portion 22 includes at least two, and the current path portion 23 is an area formed by a collection of straight lines connecting any point on the first welding portion 21 and any point on any second welding portion 22.

[0053] The second weld prints 22 may be two, three, four or even more, and the first weld print 21 may be one. The current path portion 23 is an area formed by the collection of straight lines connecting any point on the first weld print 21 and any point on any second weld print 22. It can be understood that the collection of straight lines connecting any point on the first weld print 21 and any point on each second weld print 22 can form a current concentration area, and the collection of all current concentration areas is the current path portion 23. For example, referring to Figure 4 , Figure 4 A schematic diagram showing the design of the adapter sheet of one or more embodiments is shown, wherein Figure 4 In the illustrated embodiment, the second weld print portion 22 includes two, the collection of connecting straight lines from any point on the first weld print portion 21 to any point on one of the second weld print portions 22 forms an area M1, and the collection of connecting straight lines from any point on the first weld print portion 21 to any point on the other second weld print portion 22 forms an area M2, then the current path portion 23 is the collection area of ​​the area M1 and the area M2, that is, Figure 3 The current path portion 23 is shown.

[0054] In the technical solution of the embodiment of the present application, through the above-mentioned arrangement, the current path portion 23 is formed into a region of minimum resistance for current to flow between the first weld print portion 21 and at least two second weld print portions 22, thereby improving the utilization rate of the adapter, reducing the weight of the adapter and the materials used, reducing costs, and also improving the energy density of the battery cell.

[0055] In one or more embodiments of the present application, Figure 7 and Figure 8 As shown, Figure 7 and Figure 8 A schematic diagram of the structure of an adapter sheet of one or more embodiments of the present application is shown, wherein the first weld print portion 21 includes at least two, and the current path portion 23 is an area formed by a collection of straight lines connecting any point on the second weld print portion 22 and any point on any first weld print portion 21.

[0056] The first weld prints 21 may be two, three, four or even more. The second weld print 22 may be one. The current path portion 23 is an area formed by the collection of connecting straight lines from any point on the second weld print 22 to any point on any first weld print 21. It can be understood that the collection of connecting straight lines from any point on the second weld print 22 to any point on each first weld print 21 can form a current concentration area, and the collection of all current concentration areas is the current path portion 23. For example, referring to Figure 8 ,exist Figure 8In the illustrated embodiment, the first welding print portion 21 includes two, the collection of connecting straight lines from any point on the second welding print portion 22 to any point on one of the first welding print portions 21 forms an area M3, and the collection of connecting straight lines from any point on the second welding print portion 22 to any point on the other first welding print portion 21 forms an area M4, then the current path portion 23 is the collection area of ​​the area M3 and the area M4, that is, Figure 7 The current path portion 23 is shown.

[0057] In the technical solution of the embodiment of the present application, through the above-mentioned arrangement, the current path portion 23 is formed into a region of minimum resistance for current to flow between at least two first weld prints 21 and the second weld prints 22, thereby improving the utilization rate of the adapter, reducing the weight of the adapter and the materials used, reducing costs, and also improving the energy density of the battery cell.

[0058] In one or more embodiments of the present application, Fig. 9 As shown, the first welding parts 21 include at least two, the second welding parts 22 include at least two, and the current path part 23 is a region formed by a collection of straight lines connecting any point on any first welding part 21 and any point on any second welding part 22 .

[0059] The first weld prints 21 may be two, three, four or even more, and the second weld prints 22 may be two, three, four or even more. The current path portion 23 is an area formed by a collection of connecting straight lines from any point on any first weld print 21 to any point on any second weld print 22. It can be understood that: the collection of connecting straight lines from any point on each first weld print 21 to any point on each second weld print 22 can form a current concentration area, and the collection of all current concentration areas is the current path portion 23. For example, Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, the first welding portion 21 includes two, and the second welding portion 22 includes two. Fig.10 , a collection of straight lines connecting any point on one of the first weld prints 21 and any point on one of the second weld prints 22 forms an area M5. Fig.11 The collection of straight lines connecting any point on the first weld print 21 and any point on the second weld print 22 forms an area M6. Fig.12 , the set of connecting straight lines of any point on the other first welding print 21 and any point on one of the second welding prints 22 forms an area M7, such as Fig.13 , the set of connecting straight lines of any point on the other first welding print 21 and any point on the other second welding print 22 forms an area M8, then Fig.14As shown, the current path portion 23 is a collection area of ​​the area M5, the area M6, the area M7, and the area M8, that is, Fig. 9 The current path portion 23 is shown.

[0060] In the technical solution of the embodiment of the present application, through the above-mentioned arrangement, the current path portion 23 is formed into a region of minimum resistance for current to flow between at least two first weld prints 21 and at least two second weld prints 22, thereby improving the utilization rate of the adapter, reducing the weight of the adapter and the materials used, reducing costs, and also improving the energy density of the battery cell.

[0061] In one or more embodiments of the present application, in the thickness direction, the thickness of the first weld print portion 21 is 0.3-1.5 mm, and / or the thickness of the second weld print portion 22 is 0.3-1.5 mm, and / or the thickness of the current path portion 23 is 0.3-1.5 mm.

[0062] The thicknesses of the first weld print portion 21 , the second weld print portion 22 and the current path portion 23 may be the same or different.

[0063] In the technical solution of the embodiment of the present application, the thickness of the first weld print portion 21, the thickness of the second weld print portion 22 and the thickness of the current path portion 23 are set within the above-mentioned range to facilitate the processing of the adapter sheet and facilitate the welding of the first weld print portion 21 and the second weld print portion 22. If the thickness of the first weld print portion 21, the second weld print portion 22 and the current path portion 23 exceeds 1.5 mm, it is difficult to weld. If the thickness of the first weld print portion 21, the second weld print portion 22 and the current path portion 23 is less than 0.3 mm, it is difficult to process.

[0064] In one or more embodiments of the present application, the thickness of the current path portion 23 gradually decreases from the middle to both ends.

[0065] The middle of the current path portion 23 refers to the middle along its length, and the two ends refer to the ends of the current path portion 23 connected to the first weld print portion 21 and the second weld print portion 22, respectively. The thickness of the current path portion 23 gradually decreases from the middle to the two ends, which can be understood as: the thickness of the current path portion 23 gradually decreases from the middle away from the first weld print portion 21 or the second weld print portion 22 to the ends close to the first weld print portion 21 and the second weld print portion 22, respectively.

[0066] In the technical solution of the embodiment of the present application, through the above-mentioned setting, since the current is largest in the middle of the current path portion 23, the thickness of the middle portion of the current path portion 23 is set to be thicker than the two ends, so that it is not easily damaged due to excessive current in the middle, thereby extending the service life of the adapter.

[0067] In some embodiments, Fig.15As shown, in the thickness direction of the current path portion 23, one side of the current path portion 23 may be a plane, and the other side opposite thereto may be a curved surface whose thickness gradually decreases from the middle to both ends. Fig.16 As shown, in the thickness direction of the current path portion 23 , the two opposite surfaces of the current path portion 23 may be curved surfaces whose thickness gradually decreases from the middle portion to both ends.

[0068] In some embodiments, in the thickness direction of the first weld print portion 21 , the thickness of the first weld print portion 21 is consistent; and / or, in the thickness direction of the second weld print portion 22 , the thickness of the second weld print portion 22 is consistent.

[0069] In the technical solution of the embodiment of the present application, the above arrangement is used to facilitate welding at the positions of the first welding mark 21 and the second welding mark 22 .

[0070] In some embodiments, the conductivity of the adapter is greater than 30 mS / m.

[0071] The adapter can be made of metal materials such as aluminum, copper or nickel, and the electrical conductivity is greater than 30mS / m, so that the electrode terminal and the electrode ear can be connected and conducted through the adapter.

[0072] In some embodiments, the shape of the first weld portion 21 or the second weld portion 22 can be a regular shape, such as a rectangle, a square, a circle, an ellipse, or an irregular shape, which is not limited here. The first weld portion 21 and the electrode terminal can be welded by laser, and the second weld portion 22 and the tab can be welded by ultrasonic.

[0073] The present application also provides a battery cell, comprising: an electrode terminal, a pole lug 12 and the adapter, which is used to connect the electrode terminal and the pole lug 12. The first weld stamp 21 of the adapter is welded to the electrode terminal, and the second weld stamp 22 of the adapter is welded to the pole lug 12. Since the overall weight of the adapter is reduced, the energy density of the battery cell can be indirectly increased when the energy of the battery cell remains unchanged.

[0074] The present application also provides a battery, including the battery cell. It should be noted that the battery can be a battery module and a battery pack, and has all the functions of the aforementioned battery cell, and the beneficial effects of the battery can refer to the beneficial effects of the aforementioned battery cell.

[0075] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A transfer sheet, characterized in that: include: A first welding portion (21) is used for electrically connecting to an electrode terminal of a battery cell; A second weld stamp (22) for electrically connecting to a tab of the battery cell; A current path portion (23) is connected between the first weld print portion (21) and the second weld print portion (22), and the current path portion (23) is a region formed at a location of minimum resistance for current to flow between the first weld print portion (21) and the second weld print portion (22).

2. The adapter according to claim 1, characterized in that: The first weld mark (21) is an area in welding contact with the electrode terminal; the second weld mark (22) is an area in welding contact with the electrode tab; and the current path (23) is an area formed by a collection of straight lines connecting any point on the first weld mark (21) and any point on the second weld mark (22).

3. The adapter according to claim 2, characterized in that: The second weld marks (22) include at least two, and the current path portion (23) is an area formed by a collection of straight lines connecting any point on the first weld mark (21) and any point on any second weld mark (22); or The first weld prints (21) include at least two, and the current path portion (23) is a region formed by a collection of straight lines connecting any point on the second weld print (22) and any point on any first weld print (21).

4. The adapter according to claim 2, characterized in that: The first welding marks (21) include at least two, the second welding marks (22) include at least two, and the current path portion (23) is an area formed by a collection of straight lines connecting any point on any of the first welding marks (21) and any point on any of the second welding marks (22).

5. The adapter according to any one of claims 1 to 4, characterized in that: In the thickness direction, the thickness of the first weld print portion (21) is 0.3-1.5 mm, and / or, The thickness of the second weld print portion (22) is 0.3-1.5 mm, and / or, The thickness of the current path portion (23) is 0.3 to 1.5 mm.

6. The adapter according to claim 5, characterized in that: The thickness of the current path portion (23) gradually decreases from the middle to both ends.

7. The adapter according to claim 5, characterized in that: In the thickness direction of the first weld print portion (21), the thickness of the first weld print portion (21) is consistent; and / or, In the thickness direction of the second weld print portion (22), the thickness of the second weld print portion (22) is consistent.

8. The adapter according to claim 1, characterized in that: The conductivity of the adapter is greater than 30 mS / m.

9. A battery cell, characterized in that: include: Electrode terminal; Tabs (12); The adapter according to any one of claims 1 to 8, wherein the adapter is used to connect the electrode terminal and the electrode tab (12).

10. A battery, characterized in that: Comprising the battery cell according to claim 9.

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