Adapter, end cover assembly and battery

Abstract

The utility model relates to an adapter, an end cover assembly and a battery. The adapter is used for connecting the tab and the electrode terminal, the adapter comprises a first surface and a second surface which are oppositely arranged in the thickness direction, the first surface is configured to be welded to the electrode terminal through laser, the second surface is configured to be connected to the tab, a light absorption layer is formed on the second surface, and the light absorption layer is used for increasing the laser absorption rate of the adapter. The light absorption layer is formed on the second surface, the laser energy absorption rate of the second surface is increased through the light absorption layer, the laser reflectivity during laser welding is reduced, the laser welding process of the first surface and the electrode terminal is facilitated, the laser welding efficiency and quality are improved, stamping machining does not need to be carried out on the adapter, and the production cost is reduced. And the problems of cracks, deformation, mechanical stress, work hardening and the like of the adapter are avoided.

Description

Technical Field

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

[0002] Laser welding has the characteristics of high efficiency and low cost, and is commonly used in the metal connection process of power batteries. For example, reliable connection can be achieved by laser penetration welding between the pole post of a power battery and an adapter. However, the metals used for the adapter (such as aluminum alloy, red copper, etc.) have relatively low laser absorption rates, which is not conducive to the direct welding of the pole post and the adapter.

[0003] In related technologies, it is usually necessary to use a mold to stamp dense concave dot embossing on the surface of the adapter to improve the laser welding effect. However, affected by the mold and stamping process, it is very difficult to control the consistency of the depth and density of the embossing, and mold stamping is likely to cause problems such as cracks, thinning of the adapter, and large mechanical stress and work hardening in the stamping part, affecting the subsequent laser welding. Utility Model Content

[0004] Based on this, it is necessary to provide an adapter, an end cover assembly and a battery for the above technical problems.

[0005] In the first aspect of the present application, an adapter is provided. The adapter is used to connect a tab and an electrode terminal. The adapter includes a first surface and a second surface that are oppositely arranged in the thickness direction. The first surface is configured to be laser welded to the electrode terminal, and the second surface is configured to be connected to the tab. An absorbent layer is formed on the second surface, and the absorbent layer is used to increase the laser absorption rate of the adapter.

[0006] By forming the absorbent layer on the second surface, the absorbent layer increases the laser energy absorption rate of the second surface and reduces the laser reflectivity during laser welding, which helps the laser welding process between the first surface and the electrode terminal, improves the efficiency and quality of laser welding, prevents problems such as poor welding like virtual welding or void welding during the welding process, and there is no need to perform stamping on the adapter, avoiding problems such as cracks, deformation, mechanical stress and work hardening of the adapter.

[0007] In one embodiment, the thickness of the absorbent layer is 0.1 μm - 1 mm.

[0008] In one embodiment, the absorbent layer includes any one of a coating layer, an electroplated layer, a chemical plating layer and a magnetron sputtering layer.

[0009] In one embodiment, the coating layer is a matte layer.

[0010] In one embodiment, the coating layer is an organic coating or a hybrid coating.

[0011] In one embodiment, the electroplated layer, electroless plating layer or magnetron sputtering layer is a metal layer.

[0012] In one embodiment, the adapter includes a welding portion and a limiting portion connected to the welding portion. The welding portion is used to connect the electrode terminal and the tab, and the limiting portion is used to align the welding portion with the electrode terminal.

[0013] The second aspect of the present application provides an end cap assembly, which includes: an end cap plate; an electrode terminal connected to the end cap plate; and the adapter as described above, and the first surface of the adapter is laser welded to the electrode terminal.

[0014] In one embodiment, the light absorbing layer covers the entire second surface; or, the light absorbing layer is disposed on the second surface corresponding to the welding area of the first surface.

[0015] The third aspect of the present application provides a battery, which includes: an electrode assembly including an electrode and a tab connected to the electrode; a housing for accommodating the electrode assembly; and the end cap assembly as described above, and the end cap assembly is connected to the housing so that the electrode assembly is enclosed in the housing, and the second surface of the adapter is connected to the tab. Description of the Drawings

[0016] Figure 1 Schematic diagram of the battery in one embodiment of the present application.

[0017] Figure 2 Exploded view of the battery in one embodiment of the present application from the first perspective.

[0018] Figure 3 Exploded view of the battery in one embodiment of the present application from the second perspective.

[0019] Figure 4 Schematic diagram of the adapter in one embodiment of the present application.

[0020] Figure 5 For Figure 4 Cross-sectional view of the adapter in.

[0021] Figure 6 Schematic diagram of the adapter in one embodiment of the present application, where the light absorbing layer is an organic coating.

[0022] Figure 7 For Figure 6 Cross-sectional view of the adapter of.

[0023] Description of the Reference Numerals:

[0024] 100. Battery; 10. Electrode assembly; 11. Tab; 111. First tab; 112. Second tab; 20. Housing; 30. End cover assembly; 31. End cover plate; 311. Positioning protrusion; 32. Electrode terminal; 321. First electrode terminal; 322. Second electrode terminal; 323. Third surface; 324. Fourth surface; 33. Adapter; 331. First surface; 332. Second surface; 3321. Light-absorbing layer; 333. Welding part; 334. Limiting part. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0027] In addition, if such terms as "first" and "second" appear, these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In this application, unless otherwise clearly defined and limited, if there is a description such as the first feature being "on" or "under" the second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or just means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or just means that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0031] Refer to Figures 1 to 3 , Figures 1 to 3 FIG. shows a schematic diagram of a battery 100 in an embodiment of the present application. In some embodiments, the battery 100 includes an electrode assembly 10, a housing 20, and an end cap assembly 30.

[0032] The electrode assembly 10 is an important component of the battery 100 and is the component where the electrochemical reaction of the battery 100 occurs. The electrode assembly 10 can be one or more. The electrode assembly 10 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate (not shown), and a separator is usually provided between the positive electrode plate and the negative electrode plate.

[0033] Both the positive electrode plate and the negative electrode plate have a substrate and a tab 11. An active material layer is coated on the substrate, and the tab 11 is connected to the substrate. Generally, the tab 11 is made of a conductive metal material, and the tab 11 undertakes the function of transmitting current, transferring the electrical energy inside the battery 100 to an external load or transferring the electrical energy of the external load to the battery 100. The tab 11 includes a first tab 111 connected to the positive electrode substrate and a second tab 112 connected to the negative electrode substrate. The first tab 111 and the second tab 112 can be located at one end of the electrode assembly 10 together or at both ends of the electrode assembly 10 respectively. During the charging and discharging process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 11 is connected to the end cap assembly 30 to form a current loop.

[0034] The housing 20 is used to form the internal environment of the battery 100. The formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte and other components, and provide support and protection for the electrode assembly 10, the electrolyte and other components. Generally, the housing 20 is provided with an open end to facilitate putting the electrode assembly 10, the electrolyte and other components into the housing 20. The housing 20 can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 20 can be determined according to the specific shape and size of the electrode assembly 10. The material of the housing 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0035] The end cap assembly 30 is connected to the housing 20 to close the open end of the housing 20, forming a closed internal environment, thereby enclosing and fixing the electrode assembly 10 in the housing 20, isolating the internal environment of the battery 100 from the external environment, and helping the battery 100 to be used normally for a long time.

[0036] In some embodiments, referring to Figure 2 and Figure 3 , the end cap assembly 30 includes an end cover plate 31, an electrode terminal 32 and an adapter 33. The end cover plate 31 is connected to the open end of the housing 20, thereby closing the housing 20 and enabling the electrode assembly 10 to be stably accommodated in the housing 20. Without limitation, the shape of the end cover plate 31 can be adapted to the shape of the housing 20 to cooperate with the housing 20. Optionally, the end cover plate 31 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cover plate 31 is not easily deformed when being squeezed and collided, enabling the battery 100 to have higher structural strength and improved safety performance.

[0037] In the battery 100, there may be one or two end cap assemblies 30. If the housing 20 is a hollow structure with an opening formed at one end, then one end cap assembly 30 is correspondingly provided; if the housing 20 is a hollow structure with openings formed at both ends, then two end cap assemblies 30 are correspondingly provided, and the two end cap assemblies 30 respectively cover the two openings of the housing 20.

[0038] The electrode terminal 32 is used to electrically connect with the electrode assembly 10 for inputting or outputting the electric energy of the battery 100. The electrode terminal 32 is fixed on the end cap plate 31. Feasibly, the electrode terminal 32 and the end cap plate 31 are integrally formed. The tab 11 includes a first tab 111 and a second tab 112. Correspondingly, the electrode terminal 32 includes a first electrode terminal 321 and a second electrode terminal 322. The first electrode terminal 321 is connected to the first tab 111, and the second electrode terminal 322 is connected to the second tab 112. Thus, the first tab 111 is electrically connected to the first electrode terminal 321, and the second tab 112 is electrically connected to the second electrode terminal 322 to form a current loop.

[0039] The adapter 33 is used to realize the connection between the electrode terminal 32 and the tab 11, avoid damaging the tab 11 and the electrode terminal 32 when directly connecting the tab 11 and the electrode terminal 32, ensure the stability of the connection between the electrode terminal 32 and the tab 11, and the adapter 33 can electrically connect the tab 11 and the electrode terminal 32. Thus, the current is transmitted from the electrode to the tab 11, from the tab 11 to the adapter 33, from the adapter 33 to the electrode terminal 32, and from the electrode terminal 32 to the external load to ensure the normal operation and current transmission of the battery 100. Usually, the adapter 33 is prepared from a metal material with good electrical and thermal conductivity (such as aluminum alloy, copper alloy, etc.), and the adapter 33 and the electrode terminal 32 are connected by laser penetration welding.

[0040] Feasibly, two adapters 33 are configured. One adapter 33 is used to connect the first tab 111 and the first electrode terminal 321, and the other adapter 33 is used to connect the second tab 112 and the second electrode terminal 322. Thus, the first tab 111 is electrically connected to the first electrode terminal 321 through the adapter 33, and the second tab 112 is electrically connected to the second electrode terminal 322 through the adapter 33 to form a current loop.

[0041] The adapter 33 in the present application will be introduced in detail below.

[0042] In some embodiments, refer to Figures 2 to 7, the adapter 33 includes a first surface 331 and a second surface 332 that are oppositely arranged in the thickness direction. The first surface 331 faces the electrode terminal 32 and is configured to be connected to the electrode terminal 32. The second surface 332 faces away from the electrode terminal 32 and is configured to be connected to the tab 11. An absorbent layer 3321 is formed on the second surface 332, and the absorbent layer 3321 is used to increase the absorption rate of the adapter 33 to the laser.

[0043] By forming the absorbent layer 3321 on the second surface 332, increasing the absorption rate of the second surface 332 to the laser energy through the absorbent layer 3321, and reducing the laser reflectivity during laser welding, it helps the laser welding process between the first surface 331 and the electrode terminal 32, improves the efficiency and quality of laser welding, prevents problems such as poor welding like virtual welding or void welding during the welding process, and there is no need to perform stamping on the adapter 33, avoiding problems such as cracks, deformation, mechanical stress, and work hardening of the adapter 33.

[0044] Furthermore, the absorbent layer 3321 can also provide more contact points and surface area for the second surface 332, enhancing the mechanical fixation and heat conductivity between the adapter 33 and the tab 11, thereby improving the stability and strength of the welded connection between the adapter 33 and the tab 11.

[0045] The stable connection between the adapter 33 and the electrode terminal 22 and between the adapter 33 and the tab 11 is achieved through the absorbent layer 3321, thereby improving the stability of the electrical connection among the tab 11, the adapter 33, and the electrode terminal 22, enhancing the overcurrent capacity of the battery 100, and extending the service life of the battery 100.

[0046] In some embodiments, the thickness of the absorbent layer 3321 is 0.1μm - 1mm, including but not limited to 0.1μm, 0.2μm, 0.5μm, 1μm, 2μm, 3μm, 5μm, 10μm, 15μm, 20μm, 30μm, 40μm, 50μm, 100μm, 200μm, 500μm, 800μm, 900μm, 1mm.

[0047] An absorbent layer 3321 with an appropriate thickness can increase the absorption rate of the adapter 33 to the laser, reduce laser reflection, lower the energy consumption of the laser device, and ensure the welding quality of laser welding. If the thickness of the absorbent layer 3321 is too large, it is easy for the components of the absorbent layer 3321 to enter the adapter 33 during laser welding, affecting the welding performance of the adapter 33, and the mixing of components in the absorbent layer 3321 will also affect the electrical conductivity of the adapter 33; if the thickness of the absorbent layer 3321 is too small, it is difficult for the absorbent layer 3321 to cover the second surface 332, and thus it is difficult to affect the absorption rate of the second surface 332 to the laser.

[0048] Optionally, the light-absorbing layer 3321 covers the second surface 332 entirely, or the light-absorbing layer 3321 is only disposed on the second surface 332 corresponding to the welding area of the first surface 331.

[0049] Furthermore, the light-absorbing layer 3321 includes any one of a coating layer, an electroplated layer, an electroless plating layer, and a magnetron sputtering layer. The coating layer is formed on the second surface 332 of the adapter 33 by spraying, rolling, or brushing a material with a high laser absorption rate. The electroplated layer is formed by depositing a material on the second surface 332 of the adapter 33, thereby obtaining a relatively uniform and dense light-absorbing layer 3321 and facilitating the control of the thickness of the light-absorbing layer 3321. The electroless plating layer is formed on the second surface 332 of the adapter 33 through a chemical reaction to obtain a light-absorbing layer 3321 with a high surface quality. The magnetron sputtering layer is formed by bombarding a target material with high-energy ions to evaporate its surface material and deposit it on the second surface 332 to obtain a uniform and dense light-absorbing layer 3321.

[0050] Feasibly, the second surface 332 can be pretreated before coating, electroplating, electroless plating, or magnetron sputtering, such as cleaning and polishing the second surface 332, to increase the bonding force between the second surface 332 and the light-absorbing layer 3321, thereby forming a uniform and reliable light-absorbing layer 3321 on the second surface 332.

[0051] Feasibly, the coating layer is a matte layer. The matte layer usually has a high surface roughness, which can effectively scatter the laser, reduce the laser reflectivity, and make the laser more evenly distributed inside the light-absorbing layer 3321, thereby further increasing the laser absorption efficiency of the adapter 33.

[0052] In another feasible embodiment, in combination with Figure 6 and Figure 7 , the coating layer is an organic coating or a hybrid coating. The organic coating can be obtained by spraying an organic pigment (such as dark colors like black, brown, purple, etc.) on the second surface 332. The dark-colored surface is conducive to laser absorption, and at the same time, the organic pigment will melt and vaporize under the action of the laser, avoiding affecting the adapter 33. In some embodiments, particles such as carbon black and graphite can be mixed into a colloid and evenly brushed on the second surface 332 of the adapter 33 to obtain a hybrid coating. In some embodiments, inorganic particles with smaller particle sizes such as carbon black can also be incorporated into the organic pigment to obtain a mixture, and the mixture is brushed on the second surface 332 to form a hybrid coating. The smaller inorganic particles will form protrusions on the surface of the hybrid coating, increasing the surface roughness and effective surface area of the light-absorbing layer 3321, further contributing to increasing the laser absorption rate of the light-absorbing layer 3321, thereby increasing the laser energy absorbed by the adapter 33 and improving the efficiency and quality of laser welding.

[0053] Further, the electroplated layer, electroless plating layer or magnetron sputtering layer is a metal layer. A metal layer with high absorption rate is plated on the second surface 332 of the adapter 33 by electroplating, electroless plating or magnetron sputtering, so as to increase the laser absorption rate of the adapter 33 through the metal with high absorption rate. Preferably, to ensure the laser welding performance and electrical conductivity of the adapter 33, the metal layer is made of a metal material with high laser absorption rate, good welding performance and good electrical conductivity. Specifically, the metal material can be iron, manganese, chromium, nickel, tin, cobalt, etc. In some specific embodiments, by controlling the process parameters of the metal layer, the roughness of the metal layer is controlled; preferably, the thickness of the metal layer is micron-level or above. By controlling the roughness and / or thickness of the metal layer, the light absorption rate of the metal layer is further increased to improve the welding effect between the adapter 33 and the electrode terminal 32.

[0054] In a feasible embodiment, the adapter 33 includes a welding portion 333, and the welding portion 333 is used for welding connection with the electrode terminal 32 and the tab 11. The first surface 331 of the welding portion 333 is connected to the electrode terminal 32 by laser welding, and the second surface 332 of the welding portion 333 is connected to the tab 11 by ultrasonic welding.

[0055] Further, referring to Figure 2 and Figure 4 , the adapter 33 further includes a limiting portion 334. The limiting portion 334 is connected to the welding portion 333, and the limiting portion 334 is used to realize the alignment connection between the welding portion 333 and the electrode terminal 32. Specifically, a positioning protrusion 311 is provided on the surface of the end cover plate 31 facing the adapter 33, and the limiting portion 334 is configured as a positioning groove matching the positioning protrusion 311. When the positioning groove is connected to the positioning protrusion 311, the welding portion 333 can be aligned with the electrode terminal 32, which helps the welding between the adapter 33 and the electrode terminal 32. For example, a U-shaped positioning groove is provided, which matches the U-shaped protrusion of the adapter 33.

[0056] Furthermore, an installation groove is formed in the electrode terminal 32 in a direction away from the adapter 33. The welding portion 333 of the adapter 33 protrudes from the limiting portion 334 in a direction towards the electrode terminal 32, and the first surface 331 of the welding portion 333 protrudes from the first surface 331 of the limiting portion 334, so as to prevent the inversion of the first surface 331 and the second surface 332 during installation, which may affect the welding strength.

[0057] In other embodiments, the adapter 33 can be provided with a positioning groove on the first surface 331 of the limiting portion 334, and a positioning protrusion matching the positioning groove is provided on the surface of the end cover plate 31 facing the adapter 33, so as to avoid the inversion of the first surface 331 and the second surface 332 during positioning and improve the welding efficiency.

[0058] In an embodiment of the present application, the electrode terminal 32 includes a third surface 323 and a fourth surface 324 which are oppositely arranged. The third surface 323 faces away from the adapter 33 and is disposed on the outer side of the end cover plate 31, and the fourth surface 324 faces the adapter 33.

[0059] When the battery 100 is assembled and fixed, it includes the following steps: placing the electrode assembly 10 in the housing 20; assembling the end cover assembly 30. Specifically, fixing the electrode terminal 32 to the end cover plate 31, and then fixing the first surface 331 of the adapter 33 to the fourth surface 324 of the electrode terminal 32 by laser welding to complete the assembly of the end cover assembly 30; connecting the end cover assembly 30 and the electrode assembly 10. Specifically, fixing and connecting the second surface 332 of the adapter 33 to the tab 11 by ultrasonic welding; connecting the housing 20 and the end cover assembly 30. Specifically, connecting the end cover plate 31 to the housing 20 to complete the assembly of the battery 100. The electrode assembly 10 transmits electrical energy to an external load through the tab 11, the adapter 33, and the electrode terminal 32 in sequence.

[0060] Specifically, the adapter 33 and the electrode terminal 32 adopt a laser penetration welding process. In the laser penetration welding process, the materials to be welded are stacked, such as the adapter 33 on top and the electrode terminal 32 below. The laser irradiates the light-absorbing layer 3321 on the second surface 332 of the adapter 33, and under the laser energy, the first surface 331 of the adapter 33 is connected to the fourth surface 324 of the electrode terminal 32.

[0061] It should be noted that the order of the steps of assembling the end cover assembly 30, placing the electrode assembly 10 in the housing 20, and connecting the end cover assembly 30 and the electrode assembly 10 is not limited. For example, first assemble the end cover assembly 30, then connect the end cover assembly 30 and the electrode assembly 10, and finally place the electrode assembly 10 connected to the end cover assembly 30 in the housing 20; or first assemble the end cover assembly 30, then place the electrode assembly 10 in the housing 20, and finally connect the end cover assembly 30 and the electrode assembly 10; or first place the electrode assembly 10 in the housing 20, then assemble the end cover assembly 30, and finally connect the end cover assembly 30 and the electrode assembly 10.

[0062] The light-absorbing layer 3321 is formed on the second surface 332 of the adapter 33 facing away from the electrode terminal 32 by laser etching technology, effectively increasing the absorption of laser energy on the surface of the adapter 33, which is beneficial to the laser welding of the adapter 33 and the electrode terminal 32, improving the efficiency and quality of laser welding. Further, the stability of the electrical connection between the adapter 33 and the electrode terminal 32 can be improved, and thus the stability of the battery can be improved.

[0063] Laser penetration welding is performed through the adapter 33 and the electrode terminal 32, without the need to process the adapter 33 any further. Moreover, laser welding is a non-contact welding method with high welding efficiency, high machining accuracy, and high automation. It can ensure a reliable connection strength between the adapter 33 and the electrode terminal 32, thereby reducing the production cost of the battery 100, improving the production efficiency of the battery 100, and enhancing the production quality of the battery 100.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0065] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A transfer piece, which is used to connect a tab and an electrode terminal, characterized in that: The adapter includes a first surface and a second surface arranged opposite to each other in the thickness direction, the first surface is configured to be laser welded to the electrode terminal, the second surface is configured to be connected to the pole ear, and a light absorbing layer is formed on the second surface, and the light absorbing layer is used to increase the absorption rate of the adapter to the laser.

2. The adapter according to claim 1, characterized in that: The thickness of the light absorbing layer is 0.1 μm-1 mm.

3. The adapter according to claim 1, characterized in that: The light absorbing layer includes any one of a coating layer, an electroplating layer, a chemical plating layer and a magnetron sputtering layer.

4. The adapter according to claim 3, characterized in that: The coating layer is a matte layer.

5. The adapter according to claim 3, characterized in that: The coating layer is an organic coating or a mixed coating.

6. The adapter according to claim 3, characterized in that: The electroplating layer, the chemical plating layer or the magnetron sputtering layer is a metal layer.

7. The adapter according to claim 1, characterized in that: The adapter comprises a welding portion and a limiting portion connected to the welding portion, wherein the welding portion is used to connect the electrode terminal and the electrode tab, and the limiting portion is used to position the welding portion opposite to the electrode terminal.

8. An end cap assembly, characterized in that: The end cap assembly comprises: End cover plate; an electrode terminal connected to the end cover plate; and The adapter as described in any one of claims 1 to 7, wherein the first surface of the adapter is laser welded to the electrode terminal.

9. The end cap assembly according to claim 8, characterized in that: The light absorbing layer covers the entire second surface; or, The light absorbing layer is disposed on the second surface corresponding to a welding area of ​​the first surface.

10. A battery, characterized in that: The battery comprises: An electrode assembly, the electrode assembly comprising an electrode and a tab connected to the electrode; a housing for accommodating the electrode assembly; and The end cap assembly as described in claim 8 or 9, wherein the end cap assembly is connected to the shell so that the electrode assembly is enclosed in the shell, and the second surface of the adapter is connected to the electrode ear.

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