Adapter piece, top cover assembly and battery

Abstract

The utility model relates to an adapter piece, a top cover assembly and a battery, the adapter piece is used for realizing the connection of an electrode terminal and an electrode assembly, the adapter piece comprises a first surface and a second surface which are oppositely arranged along the thickness direction of the adapter piece, the first surface is used for being connected with the electrode assembly, and the second surface is used for being connected with the electrode terminal; wherein the first surface is provided with a plurality of salient points. According to the utility model, the plurality of salient points are arranged on the first surface of the switching piece, so that the roughness of the first surface can be increased, when the switching piece is connected with the electrode of the electrode assembly through laser welding, the arrangement of the salient points can improve the laser absorption rate during laser welding, and the welding strength of the switching piece can be improved under the condition of lower energy consumption; and meanwhile, the welding surface forming can be improved. In addition, according to the battery provided by the utility model, as the welding strength of the adapter plate is improved, dislocation or physical strength between the adapter plate and the electrode assembly can be avoided, the battery is prevented from being broken, the service life of the battery is prolonged, and the reliability is high.

Description

Technical Field

[0001] The present application relates to the technical field of adapters, and in particular to an adapter, a top cover assembly and a battery. Background Art

[0002] A power battery is a rechargeable battery used to drive electric vehicles, usually consisting of several battery cells. Laser welding is a welding technology that uses a laser beam to fuse metal or thermoplastic materials together, which can achieve fine welding, high connection efficiency and low cost.

[0003] In power batteries, the battery pole and the adapter are usually welded by laser penetration to achieve a permanent and reliable connection. However, in current power batteries, the metal used in the battery cell has a relatively low laser absorption rate, which makes the welding effect poor. Therefore, the adapter needs to be processed to increase the laser absorption rate, thereby reducing energy consumption and improving the quality of laser welding. Utility Model Content

[0004] Based on this, it is necessary to provide an adapter, a top cover assembly and a battery, which can improve the laser absorption rate during laser welding and improve the welding strength of the adapter with lower energy consumption.

[0005] In a first aspect, the utility model provides a transfer sheet for realizing the connection between an electrode terminal and an electrode assembly. The transfer sheet comprises a first surface and a second surface which are arranged opposite to each other along the thickness direction of the transfer sheet. The first surface is used for connecting to the electrode assembly, and the second surface is used for connecting to the electrode terminal. The first surface is provided with a plurality of protrusions.

[0006] In one embodiment, the shape of each protrusion is one or more of a sphere, a cone, a truncated cone, a cylinder or a triangular pyramid.

[0007] In one embodiment, the height of each protrusion is no greater than 0.5 mm.

[0008] In one embodiment, the bumps are arranged in an array on the first surface;

[0009] Alternatively, the bumps are arranged on the first surface in a disorderly manner.

[0010] In one embodiment, the protrusions are distributed all over the first surface, or the protrusions are only arranged in the laser welding area of ​​the first surface.

[0011] In one embodiment, the second surface is a plane.

[0012] In one embodiment, the thickness of the adapter sheet is 0.3 mm to 3 mm, and the height of each protrusion is smaller than the thickness of the adapter sheet.

[0013] In one of the embodiments, a limiting portion is provided at one end of the adapter sheet, and the limiting portion is used to position the adapter sheet when it is connected to the electrode assembly and to prevent the first surface and the second surface from being reversed.

[0014] In a second aspect, the utility model provides a top cover assembly, including a top cover plate, an electrode terminal, and a transfer sheet according to the first aspect, wherein:

[0015] The electrode terminal comprises a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are both arranged on the top cover plate;

[0016] The adapter plate includes a first adapter plate and a second adapter plate, the first adapter plate is connected to the first electrode terminal by laser welding, and the second adapter plate is connected to the second electrode terminal by laser welding.

[0017] In a third aspect, the utility model provides a battery, comprising a top cover assembly, an electrode assembly and a shell as proposed in the second aspect above, wherein the electrode assembly is accommodated in the shell, and the top cover assembly is arranged at the opening of the shell to seal the electrode assembly in the shell; wherein:

[0018] The electrode assembly includes a first electrode and a second electrode. The first electrode is connected to the first surface of the first adapter plate through a first electrode tab, and the second electrode is connected to the first surface of the second adapter plate through a second electrode tab.

[0019] The beneficial effects of the utility model are as follows:

[0020] By providing a plurality of protrusions on the first surface of the adapter, the roughness of the first surface can be increased. When the adapter and the electrode of the electrode assembly are connected by laser welding, the provision of the protrusions can improve the absorption rate of the laser during laser welding, thereby improving the welding strength of the adapter with lower energy consumption, and also improving the welding surface molding. The utility model provides protrusions on the first surface of the adapter without performing additional operations on the adapter body, and the processing is simple and does not affect subsequent welding. In addition, when the battery proposed by the utility model is subjected to external impact, due to the improvement of the welding strength of the adapter, the dislocation or fracture between the adapter and the electrode assembly can be avoided, thereby preventing the battery from being short-circuited, improving the service life of the battery, and having strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are 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 creative work.

[0022] FIG1 is a schematic diagram of a battery according to an embodiment;

[0023] FIG2 is a schematic diagram of an explosion and decomposition of the battery in FIG1 at a first angle;

[0024] FIG3 is a schematic diagram of an explosion and decomposition of the battery in FIG1 at a second angle;

[0025] FIG. 4 is a schematic diagram of an adapter sheet according to an embodiment.

[0026] Description of reference numerals:

[0027] 100, top cover assembly; 110, electrode terminal; 112, first electrode terminal; 114, second electrode terminal; 120, adapter; 122, first adapter; 124, second adapter; 1222 / 1242, first surface; 1224 / 1244, second surface; 1226 / 1246, limit portion; 1228 / 1248, bump; 130, top cover plate; 200, electrode assembly; 212, first pole ear; 214, second pole ear; 300, shell. DETAILED DESCRIPTION

[0028] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0031] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0032] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0033] First, the adapter sheet provided in the first aspect of the utility model is described.

[0034] In one embodiment, referring to Figures 1 to 4, the adapter sheet 120 of this embodiment is used to realize the connection between the electrode terminal 110 and the electrode assembly 200. The adapter sheet 120 includes a first surface and a second surface arranged opposite to each other along the thickness direction of the adapter sheet 120. The first surface is used to connect with the electrode assembly 200, and the second surface is used to connect with the electrode terminal 110; wherein the first surface is provided with a plurality of bumps.

[0035] In a specific embodiment, the first surface of the adapter 120 is connected to the electrode on the electrode assembly 200, and the second surface of the adapter 120 is connected to the electrode terminal 110 on the top cover. The adapter 120 is a conductive member, such as an aluminum member or a copper member.

[0036] As shown in FIG2 , since the battery includes two electrodes with opposite polarities, they are referred to as the first electrode and the second electrode in this embodiment. The corresponding adapter sheet 120 also includes a first adapter sheet 122 corresponding to the first electrode, and a second adapter sheet 124 corresponding to the second electrode. The first adapter sheet 122 includes a first surface 1222 and a second surface 1242 arranged along the thickness direction of the first adapter sheet 122, and the second adapter sheet 124 includes a first surface 1224 and a second surface 1244 arranged along the thickness direction of the second adapter sheet 124.

[0037] To facilitate subsequent description, the electrode terminal on the top cover assembly 100 connected to the first adapter plate 122 is defined as the first electrode terminal 112, and the electrode terminal connected to the second adapter plate 124 is defined as the second electrode terminal 114; the electrode on the electrode assembly 200 connected to the first adapter plate 122 is defined as the first pole ear 212, and the electrode connected to the second adapter plate 124 is defined as the second pole ear 214.

[0038] In the absence of special instructions, for the convenience of description, all electrodes connected to the "first" related devices have the same polarity, and all electrodes connected to the "second" related devices have the same polarity.

[0039] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first electrode may be referred to as a second electrode, and similarly, a second electrode may be referred to as a first electrode. Both the first electrode and the second electrode are electrodes, but they are not the same electrode.

[0040] The following mainly takes the first adapter 122 as an example for explanation. The connection relationship and function of the second adapter 124 are basically the same as those of the first adapter 122, except that the two adapters 120 are respectively connected to electrodes of different polarities. In the absence of special instructions, the adapter 120 can be the first adapter 122 or the second adapter 124, and all records and disclosures about the first adapter 122 can be applicable to the second adapter 124.

[0041] The second surface 1224 of the first adapter plate 122 is connected to the first electrode terminal 112 of the top cover assembly 100 by laser welding, and the first surface 1222 is opposite to the laser welding head.

[0042] The first adapter sheet 122 has a plurality of convex points 1228 disposed on the first surface 1222. The provision of the convex points 1228 can improve the laser absorption rate of the first adapter sheet 122 during laser welding and reduce the energy consumption during laser welding. Compared with the dense concave points obtained by punching on the first adapter sheet 122, the laser absorption rate of the convex points is much higher than that of the concave points. This is because when the concave points are embossed, the depth and density of the concave points are different, which greatly affects the laser absorption rate and makes it difficult to control the consistency of the product; and the punching of the first adapter sheet 122 is prone to defects such as cracks and thinning, and the punching part is also prone to problems such as large mechanical stress and work hardening, which makes the energy consumption of the adapter sheet with concave points larger.

[0043] In a further embodiment, the shape of the protrusion 1228 is one or more of a sphere, a cone, a truncated cone, a cylinder or a triangular pyramid.

[0044] It is understandable that the shape of the protrusion 1228 in the above-mentioned first adapter plate 122 can also adopt other forms, and is not limited to the forms mentioned in the above-mentioned embodiments, as long as it can achieve the protrusion on the first adapter plate 122 to improve the laser absorption rate during laser welding.

[0045] The second surface 1224 of the first adapter sheet 122 is the surface that fits with the first electrode terminal 112 on the top cover assembly 100. Referring to Figure 2, the second surface 1224 is a plane. Because if the second surface 1224 is also provided with bumps or the roughness of the second surface 1224 is increased, there will be a gap between the second surface 1224 and the first electrode terminal 112 when they fit together. When laser welding is performed, the presence of the gap is likely to generate air, and if the air is not discharged in time, it may cause defects such as pores and cold welds during laser welding, affecting the connection strength and conductive performance between the first adapter sheet 122 and the first electrode terminal 112.

[0046] The adapter sheet 120 is usually a conductive sheet formed by stamping. Generally speaking, the thickness of the adapter sheet 120 is 0.3 mm to 3 mm, and the height of each bump on the adapter sheet 120 is smaller than the thickness of the adapter sheet 120. Preferably, the height of the bump is not higher than 0.5 mm.

[0047] In a further embodiment, the height of each protrusion is no greater than 0.5 mm.

[0048] In this embodiment, the connection efficiency during laser welding is improved by setting bumps on the adapter sheet 120. However, the height of the bumps set on the adapter sheet 120 should not be too high. If the height of the bumps on the adapter sheet 120 is too high, the thickness of the adapter sheet 120 at the corresponding bump position is relatively large. For a thicker adapter sheet 120, more laser energy needs to be absorbed to penetrate during laser welding, and welding at the same energy laser at a position without bumps is likely to cause damage to the electrode terminal 110.

[0049] This embodiment has been tested and generally speaking, the height of the bump does not exceed half of the thickness of the adapter sheet 120. In actual applications, the specific bump height and the thickness of the adapter sheet 120 can be determined based on welding tests before actual welding.

[0050] Correspondingly, the height of the bumps set on the adapter 120 should not be too low. If the height of the bumps is too low, the roughness of the first surface of the adapter 120 will be low, which will affect the reflection and absorption of the laser on the side of the bumps, and is not conducive to achieving a stable performance connection.

[0051] 4 , still taking the first adapter 122 as an example, the protrusions 1228 are arranged in an array on the first surface 1222 , and the distance between the center points of any two adjacent protrusions 1228 projected on the first surface 1222 is less than the height of any protrusion 1228 .

[0052] The bumps 1228 on the first adapter plate 122 are arranged in an array on the first surface 1222, which can more effectively utilize the space, and the arrangement of the array has good stability. Even if some of the bumps 1228 fail or are damaged, the bumps 1228 near the failed bumps 1228 can continue to work without affecting the laser welding of the first adapter plate 122.

[0053] At the same time, for the array of convex points 1228 provided on the first adapter sheet 122, the distance between any two adjacent convex points 1228 is not easy to be too large, and generally speaking, the distance between adjacent convex points 1228 needs to be smaller than the height of any convex point 1228. Specifically, the distance between two convex points 1228 can be determined by the distance between the center points of the projections of the adjacent convex points 1228 on the first surface 1222. If the distance between adjacent convex points 1228 is too large, the roughness of the first surface 1222 of the first adapter sheet 122 will be large, which will also affect the absorption rate of the laser.

[0054] It can be understood that the spacing between the above-mentioned adjacent bumps is determined according to the actual needs of laser welding and is not limited to the form mentioned in the above-mentioned embodiment. As long as the bumps in the first surface can increase the roughness of the first surface and increase its laser absorption rate, it cannot be understood as a limitation of the present application.

[0055] Alternatively, the bumps 1228 are arranged on the first surface 1222 in a disordered manner, and the distance between the center points of any two adjacent bumps 1228 projected on the first surface 1222 can be smaller or larger than the height of any bump 1228. The disordered manner is relative to the array manner, and the arrangement of the bumps 1228 is disordered.

[0056] It is understandable that the arrangement of the bumps in the above-mentioned adapter 120 may also be in other forms, not limited to the forms mentioned in the above-mentioned embodiment, as long as it can improve the laser absorption rate of the adapter during laser welding.

[0057] Furthermore, the protrusions 1228 are distributed all over the first surface 1222 , or the protrusions 1228 are only arranged in the laser welding area of ​​the first surface 1222 .

[0058] Generally, only a part of the first adapter sheet 122 is welded to the first electrode terminal 112 on the top cover assembly 100. Therefore, referring to Figures 3 and 4, the bumps 1228 on the first adapter sheet 122 are only provided in the welding area of ​​the first surface 1222. Providing the bumps 1228 only in the laser welding area of ​​the first surface 1222 can improve the processing efficiency of the first adapter sheet 122 and reduce the processing cost.

[0059] Correspondingly, in another implementation, the protrusions 1228 on the first adapter plate 122 may also cover the entire first surface 1222 .

[0060] It can be understood that the setting area of ​​the protrusions in the above-mentioned adapter 120 can also adopt other forms, and is not limited to the forms mentioned in the above-mentioned embodiment, as long as it can improve the laser absorption rate of the adapter during laser welding.

[0061] Still referring to Figures 3 and 4, taking the first adapter plate 122 as an example, a limiting portion 1226 is provided at one end of the first adapter plate 122, and the limiting portion 1226 is used to position the first adapter plate 122 when it is connected to the electrode assembly 200, and to prevent the first surface 1222 and the second surface 1224 from being reversed.

[0062] Taking FIG. 3 and FIG. 4 as examples, the limiting portion 1226 is disposed at one end of the first adapter sheet 122, and is expressed as a groove disposed at one end. The first adapter sheet 122 is limited by the setting of the groove, ensuring that the first adapter sheet 122 is accurately positioned and fixed in the correct position, which is convenient for subsequent laser welding operations. The limiting portion 1226 can prevent the first adapter sheet 122 from being positioned due to accidental vibration or damage, and can also prevent the first surface 1222 and the second surface 1224 from being reversed. Through the positioning of the limiting portion 1226, the welding efficiency of the first adapter sheet 122 when being welded and fixed can be greatly improved.

[0063] It should be noted that the width of the limiting portion 1226 can be freely set to adapt to the size of the limiting connection area, and can be larger than the laser welding area with the protrusion 1228, or smaller than the laser welding area. This embodiment has no limitation on this.

[0064] It can be understood that this embodiment has no restriction on the shape of the above-mentioned limiting portion 1226 , and is not limited to the form mentioned in the above-mentioned embodiment, as long as it can achieve the positioning of the adapter plate 120 .

[0065] Next, the top cover assembly 100 provided in the second aspect of the present invention is described.

[0066] In another embodiment, referring to FIGS. 1 to 3 , the top cover assembly 100 proposed in this embodiment includes a top cover plate 130, an electrode terminal 110, and a transfer sheet 120 according to the above, wherein: the electrode terminal 110 includes a first electrode terminal 112 and a second electrode terminal 114, and the first electrode terminal 112 and the second electrode terminal 114 are both arranged on the top cover plate 130; the transfer sheet 120 includes a first transfer sheet 122 and a second transfer sheet 124, the first transfer sheet 122 is connected to the first electrode terminal 112 by laser welding, and the second transfer sheet 124 is connected to the second electrode terminal 114 by laser welding.

[0067] Still taking the first adapter 122 as an example, in the process of welding the first adapter 122 and the first electrode terminal 112, the first adapter 122 is first placed on the first electrode terminal 112, with the second surface 1224 of the first adapter 122 facing the first electrode terminal 112, and then the laser welding head is placed opposite to the first surface 1222 of the first adapter 122, the laser welding head injects laser and melts the first adapter 122 and the first electrode terminal 112.

[0068] The top cover assembly 100 of this embodiment increases the laser absorption rate of the first surface, that is, the laser incident surface during laser welding, by setting a plurality of protrusions on the first surface of the adapter plate 120, thereby reducing the energy consumption during laser welding and ensuring the connection strength and connection area between the adapter plate 120 and the electrode terminal 110.

[0069] Generally speaking, only a part of the adapter sheet 120 on the top cover assembly 100 is connected to the electrode terminal 110, so it is only necessary to set a number of bumps in the laser welding area of ​​the adapter sheet 120. Accordingly, the bumps can also be distributed all over the first surface of the adapter sheet 120.

[0070] 3 and 4, by providing a stopper on the adapter 120, it is possible to ensure that the adapter 120 is accurately positioned and fixed in the correct position when connected to the electrode terminal 110, so as to facilitate the subsequent laser welding operation. The stopper may be a groove provided at the first end of the adapter 120, and the positioning of the groove may prevent the first surface and the second surface from being reversed. The positioning of the stopper may also improve the welding efficiency when the adapter 120 is welded and fixed.

[0071] In addition, the thickness of the adapter 120 is 0.3mm to 3mm. In order to ensure that the laser energy is not too large during laser welding, the height of the bumps on the adapter 120 should not be too large; in order not to affect the reflection and absorption of the laser on the side of the bumps, the height of the bumps on the adapter 120 should not be too low. Generally speaking, the height of the bumps is less than the thickness of the adapter. According to experimental tests, the height of the bumps does not exceed one half of the thickness of the adapter 120.

[0072] Preferably, when the thickness of the adapter sheet is 0.3 mm to 3 mm, the height of the protrusion is not higher than 0.5 mm and not lower than 0.01 mm.

[0073] Finally, the battery provided in the third aspect of the utility model is described.

[0074] In yet another embodiment, referring to FIGS. 1 to 3 , the battery proposed in this embodiment includes a top cover assembly 100, an electrode assembly 200 and a shell 300 as proposed in the previous embodiment, the electrode assembly 200 is accommodated in the shell 300, and the top cover assembly 100 is arranged at the opening of the shell 300, for enclosing the electrode assembly 200 in the shell 300; wherein: the electrode assembly 200 includes a first electrode and a second electrode, the first electrode is connected to the first surface 1222 of the first adapter plate 122 through the first pole ear 212, and the second electrode is connected to the first surface 1242 of the second adapter plate 124 through the second pole ear 214.

[0075] In the battery of this embodiment, a plurality of convex points are provided on the first surface of the adapter sheet 120 to increase the laser absorption rate of the first surface, that is, the laser incident surface during laser welding, thereby reducing the energy consumption during laser welding. Since the connection strength and connection area between the adapter sheet 120 and the electrode terminal 110 of this embodiment are increased, when the battery is subjected to external impacts such as unexpected vibration, the adapter sheet 120 can be prevented from falling off from the electrode terminal 110 on the top cover assembly 100, thereby preventing the current of the battery from being disconnected and improving the service life of the battery.

[0076] In a further embodiment, the electrode assembly 200 further includes a plurality of electrode sheets, including a first electrode sheet and a second electrode sheet with opposite polarities, and the first electrode sheet and the second electrode sheet can be arranged in the housing 300 by winding or by stacking. Regardless of winding or stacking, each electrode sheet is isolated by a diaphragm.

[0077] It is understandable that the electrode sheet can also be formed into the electrode assembly 200 in other forms and arranged in the shell 300, and is not limited to the forms mentioned in the above embodiments, as long as it can form the motor assembly 200 and be enclosed in the shell 300 through the top cover assembly 100.

[0078] The same electrode packages in the electrode sheet are connected together to obtain the first electrode and the second electrode of the electrode assembly 200. The first electrode is connected to the first adapter sheet 122 through the first electrode tab 212, and is connected to the first electrode terminal 112 on the top cover assembly 100 through the first adapter sheet 122. The second electrode is connected to the second adapter sheet 124 through the second electrode tab 214, and is connected to the second electrode terminal 114 on the top cover assembly 100 through the second adapter sheet 124.

[0079] The first electrode and the first pole ear 212 can be integrally formed or separately formed. Taking the first pole ear 212 as an example, the first pole ear 212 can be a separate conductive sheet and fixed to the first electrode by welding, or the first pole ear 212 can also be directly cut from the edge of the first electrode. The structure and process of the second pole ear 214 are similar to those of the first pole ear 212, and will not be repeated here.

[0080] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A transfer sheet, characterized in that: Used to achieve the connection between the electrode terminal and the electrode assembly, the adapter includes a first surface and a second surface arranged opposite to each other along the thickness direction of the adapter, the first surface is used to connect with the electrode assembly, and the second surface is used to connect with the electrode terminal; wherein the first surface is provided with a plurality of protrusions.

2. The adapter according to claim 1, characterized in that: The shape of each of the protrusions is one or more of a sphere, a cone, a truncated cone, a cylinder or a triangular pyramid.

3. The adapter according to claim 1, characterized in that: The height of each of the protrusions is no greater than 0.5 mm.

4. The adapter according to claim 1, characterized in that: The convex points are arranged in an array on the first surface; Alternatively, the protrusions are arranged on the first surface in a disorderly manner.

5. The adapter according to claim 1, characterized in that: The protrusions are distributed all over the first surface, or the protrusions are only arranged in the laser welding area of ​​the first surface.

6. The adapter according to claim 1, characterized in that: The second surface is a plane.

7. The adapter according to claim 1, characterized in that: The thickness of the adapter sheet is 0.3 mm to 3 mm, and the height of each of the protrusions is smaller than the thickness of the adapter sheet.

8. The adapter according to claim 1, characterized in that: A limiting portion is provided at one end of the adapter plate, and the limiting portion is used for positioning the adapter plate when it is connected to the electrode assembly, and for preventing the first surface and the second surface from being reversed.

9. A top cover assembly, characterized in that: It comprises a top cover plate, an electrode terminal and a transfer sheet according to any one of claims 1 to 8, wherein: The electrode terminal comprises a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are both arranged on the top cover plate; The adapter plate includes a first adapter plate and a second adapter plate, the first adapter plate is connected to the first electrode terminal by laser welding, and the second adapter plate is connected to the second electrode terminal by laser welding.

10. A battery, characterized in that: The invention comprises a top cover assembly, an electrode assembly and a shell as claimed in claim 9, wherein the electrode assembly is accommodated in the shell, and the top cover assembly is arranged at the opening of the shell to seal the electrode assembly in the shell; wherein: The electrode assembly includes a first electrode and a second electrode. The first electrode is connected to the first surface of the first adapter plate through a first electrode tab, and the second electrode is connected to the first surface of the second adapter plate through a second electrode tab.

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