Battery cell and battery pack

Abstract

The utility model discloses a battery monomer and a battery pack, relates to the technical field of battery correlation, and aims to solve the problem that a surface tab is torn due to the fact that an insulating tape deforms and pulls the surface tab. The battery cell provided by the utility model comprises a shell; the cover plate assembly is arranged at the opening of the shell; the electrode assembly is arranged in the shell; the first tab of the electrode assembly is welded with the first adapter or the first pole of the cover plate assembly, and a first welding seam is formed; the first pasting piece is pasted at the first welding seam, the distance between the first pasting piece and the root of the first tab is d1, and d1 is larger than 0 mm. The method is used for preventing the tab from being torn due to overlarge local stress.

Description

Battery cells and battery packs Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and a battery pack. Background Technology

[0002] During the manufacturing process of a single battery cell, the tabs of the electrode assembly are welded to the adapter or terminal of the cover plate assembly. Then, insulating tape is pasted on the side of the tab facing away from the adapter or terminal. Finally, the core is assembled and installed into the housing.

[0003] However, in the prior art, the end of the insulating tape covers and extends to the sidewall of the electrode body of the electrode assembly, causing the insulating tape to be suspended at the intersection of the electrode body and the tab, preventing the insulating tape from adhering tightly to the tab. In this state, when the insulating tape deforms, it pulls on the surface tab, causing it to tear. Summary of the Invention

[0004] This application provides a battery cell and a battery pack that can solve the problem of surface tabs tearing due to deformation of the insulating tape pulling the surface tabs.

[0005] To achieve the above objectives, in a first aspect, the battery cell provided in this application includes:

[0006] case;

[0007] A cover assembly is provided at the opening of the housing;

[0008] An electrode assembly is disposed within a housing; the first tab of the electrode assembly is welded to the first adapter or first pole of the cover plate assembly, forming a first weld.

[0009] The first adhesive piece is attached to the first weld seam, and the distance between the first adhesive piece and the root of the first electrode tab is d1, where d1 > 0 mm.

[0010] In some embodiments of this application, the first adhesive has a first edge adjacent to the root of the first tab, the distance between the first edge and the root of the first tab being d1, wherein 1mm≤d1≤2mm.

[0011] In some embodiments of this application, the electrode assembly has at least two electrodes, and the first tabs of two adjacent electrode assemblies are welded to the first adapter of the cover plate assembly to form two first welds, and the first adhesive is simultaneously attached to the two first welds.

[0012] In some embodiments of this application, the first adhesive has a first edge and a second edge disposed opposite to each other; the distance between the first edge and the root of the first tab of one of the two adjacent electrode assemblies is d1, and the distance between the second edge and the root of the first tab of the other of the two adjacent electrode assemblies is d1, wherein d1 > 0 mm.

[0013] In some embodiments of this application, the first adhesive completely covers the first weld.

[0014] In some embodiments of this application, the first adhesive element is made of an insulating material.

[0015] In some embodiments of this application, the first adhesive element is made of a transparent material.

[0016] In some embodiments of this application, the cover plate assembly includes:

[0017] A cover plate with a through hole for the first pole post, the first pole post being inserted into the hole;

[0018] The battery cell also includes a first insulating component, which is disposed between the first terminal post and the first terminal post hole.

[0019] In some embodiments of this application, the second tab of the electrode assembly is welded to the second adapter or second post of the cover plate assembly to form a second weld.

[0020] The battery cell also includes:

[0021] The second adhesive piece is attached to the second weld seam, and the distance between the second adhesive piece and the root of the second electrode lug is d2, where d2 > 0 mm.

[0022] Secondly, this application also provides a battery pack, which includes battery cells as described in any of the above technical solutions.

[0023] The above-mentioned technical solution of this application has at least the following beneficial effects:

[0024] In this technical solution, the distance between the first adhesive and the root of the first electrode tab is d1, where d1 > 0 mm. That is, the first adhesive does not extend to the root of the first electrode tab, and there is a gap between the first adhesive and the root of the first electrode tab. This prevents the end of the first adhesive from extending to the sidewall of the electrode body and becoming suspended at the root of the first electrode tab, ensuring a completely tight fit between the first adhesive and the first electrode tab, forming a continuous contact surface. Furthermore, this ensures that external force is evenly distributed across the entire coverage area of ​​the first adhesive through the contact surface between the first adhesive and the first electrode tab, preventing excessive tensile force at a localized point (e.g., the root) of the first electrode tab, thus avoiding tearing of the first electrode tab due to excessive localized stress. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is an exploded view of a single battery cell in an embodiment of this application;

[0027] Figure 2 is a cross-sectional view of a single battery cell in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the electrode assembly in the battery cell in an embodiment of this application before the first adhesive component is provided;

[0029] Figure 4 is a schematic diagram of the structure of the electrode assembly in the battery cell in this embodiment of the present application before the core is assembled and a first adhesive is provided.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Shell; 11-Opening; 12-Receiving cavity; 2-Cover assembly; 21-First adapter; 211-First weld; 22-First pole post; 23-Cover plate; 231-First pole post hole; 232-Second pole post hole; 24-Second adapter; 241-Second weld; 25-Second pole post; 3-Electrode assembly; 31-First tab; 32-Second tab; 321-Connecting end; 322-Free end; 33-Electrode body; 4-First adhesive; 41-First edge; 42-Second edge; 5-First insulating component; 6-Second adhesive component; 7-Second insulating component; Z-Thickness direction; Y-Width direction; X-Length direction. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] This application provides a battery cell and a battery pack, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0037] During the manufacturing process of a single battery cell, the tabs on the electrode assembly are welded to the adapter or terminal of the cover plate assembly. Then, insulating tape is pasted on the side of the tab facing away from the adapter or terminal. Finally, the core is assembled and installed into the housing.

[0038] However, in the prior art, the end of the insulating tape covers and extends to the sidewall of the electrode body of the electrode assembly, causing the insulating tape to be suspended at the intersection of the electrode body and the tab, preventing the insulating tape from adhering tightly to the tab. In this state, when the insulating tape deforms, it pulls on the surface tab, causing it to tear.

[0039] In other words, when the insulating tape is suspended in the air, a portion of the tape is not in direct contact with the electrode tab. Because the insulating tape itself has a certain degree of elasticity and flexibility, when subjected to external forces (such as its own weight or vibrations during battery assembly), the suspended portion of the insulating tape will deform. This deformation disrupts the original adhesion between the insulating tape and the electrode tab, causing tension on the electrode tab in direct contact and potentially leading to tearing of that layer.

[0040] To address this, this application provides a battery cell comprising a housing, a cover assembly, an electrode assembly, and a first adhesive element. The cover assembly is disposed at an opening in the housing. The electrode assembly is disposed within the housing, and a first tab of the electrode assembly is welded to a first adapter or a first terminal of the cover assembly to form a first weld. The first adhesive element is adhered to the first weld, and the distance between the first adhesive element and the root of the first tab is d1, where d1 > 0 mm.

[0041] In this technical solution, the distance between the first adhesive and the root of the first electrode tab is d1, where d1 > 0 mm. That is, the first adhesive does not extend to the root of the first electrode tab, and there is a gap between the first adhesive and the root of the first electrode tab. This prevents the end of the first adhesive from extending to the sidewall of the electrode body and becoming suspended at the root of the first electrode tab, ensuring a completely tight fit between the first adhesive and the first electrode tab, forming a continuous contact surface. Furthermore, this ensures that external force is evenly distributed across the entire coverage area of ​​the first adhesive through the contact surface between the first adhesive and the first electrode tab, preventing excessive tensile force at a localized point (e.g., the root) of the first electrode tab, thus avoiding tearing of the first electrode tab due to excessive localized stress.

[0042] The battery cell provided in this application will now be described in detail with reference to the accompanying drawings. Referring to Figures 1 and 2, the battery cell includes a housing 1, which has a receiving cavity 12 and an opening 11 communicating with the receiving cavity 12. An electrode assembly 3 is disposed within the receiving cavity 12, and a cover plate assembly 2 is connected to the housing 1 to seal the opening 1, thereby sealing the electrode assembly 3 within the receiving cavity 12. The cover plate assembly 2 has intersecting thickness direction Z, width direction Y, and length direction X.

[0043] The casing 1 serves as the external protective structure for the battery cell, the cavity 12 provides physical space for the electrode assembly 3, the opening 11 facilitates the installation of the electrode assembly 3 and its connection with other components, and the cover assembly 2 serves to seal the opening 11, ensuring that the internal structure and performance of the battery cell are not disturbed by external factors.

[0044] The cover assembly 2 serves as a structural frame for the battery cell on top or bottom, facilitating the sealing of the battery cell. It typically uses materials with insulating properties or incorporates insulating structures in its design to prevent short circuits between components of different polarities within the battery cell. Furthermore, to achieve a good seal, the cover assembly 2 is usually made of materials with a certain degree of elasticity and sealing performance, and its design takes into account the precision of its fit with the opening 11 to ensure a tight seal and prevent moisture, dust, etc., from entering the receiving cavity 12.

[0045] For example, the cover plate assembly 2 includes a first adapter 21, a first terminal post 22, and a cover plate 23. The cover plate 23 has a first terminal post hole 231 and a second terminal post hole 232 extending along the thickness direction Z. The first terminal post 22 passes through the first terminal post hole 231. The second terminal post 25 passes through the second terminal post hole 232. The first terminal post hole 231 and the second terminal post hole 232 on the cover plate assembly 2 provide a precise installation positioning reference for the first terminal post 22 and the second terminal post 25, ensuring that the first terminal post 22 and the second terminal post 25 can be correctly installed, thereby ensuring the accuracy of the internal circuit connection of the battery cell. The first terminal post 22 and the second terminal post 25 serve as the positive and negative output terminals of the battery cell, and are electrically connected to the first tab 31 and the second tab 32 (see Figure 3 for reference numerals) of the electrode assembly 3, respectively, thereby realizing the output of internal electrical energy of the battery cell to the external circuit.

[0046] As shown in Figure 3, the first tab 31 of the electrode assembly 3 is welded to the first adapter 21 or the first electrode post 22 of the cover plate assembly 2 to form a first weld 211. It should be noted that the housing 1 shown in Figure 3 contains two electrode assemblies 3, arranged along the width direction Y, and both located on the same side of the cover plate assembly 2 in the thickness direction Z. The first tabs 31 of both electrode assemblies 3 are welded to the first adapter 21 to form the first weld 211. The first adapter 21 can concentrate the current from the two first tabs 31 to the first electrode post 22, and can also adjust the relative position of the first tabs 31 and the first electrode post 22 to ensure the welding quality of the first weld 211 (e.g., to prevent the first tabs 31 from stretching and deforming). In some other embodiments, not shown in the accompanying drawings, the first tab 31 of the electrode assembly 3 can be directly welded to the first electrode post 22 of the cover plate assembly 2 to form the first weld 211. In other words, in this embodiment, the cover plate assembly 2 may not include the first adapter 21.

[0047] Similarly, the second tab 32 of the electrode assembly 3 is welded to the second adapter 24 or the second pole 25 of the cover plate assembly 2 to form a second weld 241.

[0048] Referring to Figures 3 and 4, the first adhesive piece 4 is connected to the surface of the first tab 31 opposite to the first electrode post 22, and the distance between it and the root of the first tab 31 is d1, where d1 > 0 mm. The electrode assembly 3 includes an electrode body 33 and a first tab 31 and a second tab 32 extending from the electrode body 33. The root of the first tab 31 is the end connected to the electrode body 33. Similarly, the root of the second tab 32 is also the end connected to the electrode body 33. One of the first tab 31 and the second tab 32 is the positive tab, and the other is the negative tab.

[0049] Since the distance between the first adhesive part 4 and the root of the first electrode tab 31 is d1, where d1 > 0 mm, the first adhesive part 4 does not extend to the root of the first electrode tab 31, and there is a gap between the first adhesive part 4 and the root of the first electrode tab 31. Furthermore, the first adhesive part 4 is even less likely to extend to the side wall of the electrode body 33. Thus, it is possible to avoid the end of the first adhesive part 4 extending to the side wall of the electrode body 33 and being suspended at the root of the first electrode tab 31, ensuring that the first adhesive part 4 and the first electrode tab 31 are completely and tightly attached, and a continuous contact surface can be formed between them. This ensures that the external force can be evenly distributed across the entire coverage area of ​​the first adhesive part 4 through the contact surface between the first adhesive part 4 and the first electrode tab 31, and will not form an excessive tensile force at a local point of the first electrode tab 31 (such as the root of the first electrode tab 31), thereby avoiding tearing of the first electrode tab 31 due to excessive local stress.

[0050] Alternatively, it can be understood that when the first adhesive part 4 is subjected to external tensile force, the suspended part of the first adhesive part 4 cannot directly transmit this force to the first electrode tab 31. Instead, an unstable stress point is formed at the connection between the suspended end and the first electrode tab 31. This stress point may generate additional friction and shear force, exacerbating the tensile effect on the first electrode tab 31, and ultimately causing the first electrode tab 31 to tear.

[0051] Please refer to Figures 3 and 4. The first adhesive member 4 has a first edge 41 adjacent to the root of the first electrode tab 31. The distance between the first edge 41 and the root of the first electrode tab 31 is d1, where 1mm ≤ d1 ≤ 2mm. When the distance d1 between the first edge 41 and the root of the first electrode tab 31 is within the range of 1mm to 2mm, it can effectively prevent the end of the first adhesive member 4 from extending to the sidewall of the electrode body 33 of the electrode assembly 3, thus preventing the first adhesive member 4 from being suspended at the root of the first electrode tab 31.

[0052] If the distance d1 between the first edge 41 and the root of the first tab 31 is less than 1 mm, the first adhesive part 4 is more likely to extend to an undesirable position and become suspended when installed or affected by external factors. If the distance d1 between the first edge 41 and the root of the first tab 31 is greater than 2 mm, it indicates that the exposed area of ​​the part of the first tab 31 near its root is relatively large, which cannot effectively protect the first tab 31. As a result, the root of the first tab 31 may be damaged by vibration, impact or electrolyte corrosion.

[0053] Referring to Figure 2, in some embodiments of this application, the electrode assembly 3 has at least two members. In the width direction Y, the first tabs 31 of two adjacent electrode assemblies 3 are arranged opposite each other and are welded to the first adapter 21, forming two first welds 211. There are two first adhesive members 4, one of which is attached to one of the two first welds 211, and the other is attached to the other first weld 211. The distance between the two first adhesive members 4 and the root of the corresponding first tab 31 is d1, where 1mm ≤ d1 ≤ 2mm.

[0054] In other embodiments of this application, as shown in Figures 3 and 4, the electrode assembly 3 has at least two members. In the width direction Y, the first tabs 31 of adjacent electrode assemblies 3 are arranged opposite each other and are welded to the first adapter 21, forming two first welds 211. The first adhesive piece 4 is simultaneously attached to both first welds 211. By using the same first adhesive piece 4 to simultaneously fix the two first welds 211, assembly steps can be reduced, and production efficiency improved. Furthermore, since the first tabs 31 of adjacent electrode assemblies 3 are welded to the first adapter 21, the number of first adapters 21 can be reduced, module thickness and weight can be decreased, space utilization can be improved, and the electrical connection consistency of the two first welds 211 can be ensured.

[0055] In some embodiments of this application, the first adhesive member 4 has a first edge 41 and a second edge 42 disposed opposite to each other. The distance between the first edge 41 and the root of the first tab 31 of one of the two adjacent electrode assemblies 3 is d1, and the distance between the second edge 42 and the root of the first tab 31 of the other of the two adjacent electrode assemblies 3 is d1, where d1 > 0 mm. This design effectively prevents the end of the first adhesive member 4 from extending to the sidewall of the electrode body 33 of the two adjacent electrode assemblies 3 and being suspended at the root of the first tab 31, ensuring that the first adhesive member 4 is completely and tightly attached to the first tab 31 of the two adjacent electrode assemblies 3, forming a continuous contact surface. It also better avoids excessive tensile force at a local point (such as the root) of the first tab 31, thereby preventing tearing of the first tab 31 due to excessive local stress, significantly improving the structural stability and reliability of the battery cell. Furthermore, in this embodiment, 1 mm ≤ d1 ≤ 2 mm.

[0056] Referring to Figures 3 and 4, the first adhesive piece 4 completely covers the first weld 211. Specifically, the first weld 211 is formed on the surface of the first tab 31 facing away from the first adapter 21. The first tab 31 is welded to the first adapter 21 to form the first weld 211. Welding is a reliable electrical connection method, providing lower contact resistance compared to other connection methods (such as bolted connections). Low contact resistance means less energy loss and less heat generation during current conduction.

[0057] Furthermore, during the welding process between the first tab 31 and the first adapter 21, weld slag is inevitably generated. This slag may scatter around the first weld 211 due to welding vibrations, molten pool spatter, or other reasons. The first adhesive 4 completely covers the first weld 211, effectively isolating the weld slag from other conductive components inside the battery and preventing it from falling into the electrode body 33 of the electrode assembly 3 and causing internal short circuits. It should be noted that, in embodiments where the first adhesive 4 completely covers the first weld 211, when there is one first weld 211, the first adhesive 4 can completely cover that first weld 211. When there are two first welds 211, the first adhesive 4 can completely cover all of the aforementioned first welds 211.

[0058] In some embodiments of this application, the first adhesive element 4 is made of an insulating material. This ensures that the first adhesive element 4 can provide insulation protection for the area covered by the first tab 31, effectively isolating the first tab 31 from adjacent components, preventing short circuits, and greatly improving battery safety. For example, in actual use, the first tab 31 conducts current during operation. If there are conductive materials or components nearby, a short circuit can easily occur. Therefore, the first adhesive element 4 is made of an insulating material and connected to the side of the first tab 31 facing away from the first terminal post 22. This directly insulates the first tab 31 from potentially conductive parts, effectively preventing current from flowing from the first tab 31 in directions where conduction should not occur, ensuring the electrical safety of the battery cell.

[0059] The first adhesive piece 4 also provides better fixation and support for the first tab 31. For example, during the operation of an electric vehicle, the battery is subjected to frequent vibrations. If the first tab 31 is not sufficiently covered by the first adhesive piece 4 to fix its position, the connection between the first tab 31 and the first adapter 21 may become loose, affecting the electrical performance of the battery cell.

[0060] In some embodiments of this application, the first adhesive element 4 is made of a transparent material. The transparent material of the first adhesive element 4 allows workers to directly observe the welding point between the first tab 31 and the first adapter 21, as well as other internal structures. For example, on a production line, the transparent first adhesive element 4 does not obstruct the detection light, allowing the camera to determine whether the first tab 31 is deformed, damaged, or contains foreign objects. For instance, the first adhesive element 4 can be made of transparent and insulating materials such as polyethylene, polypropylene, or polyethylene terephthalate.

[0061] The first adhesive component 4 is an insulating tape that is adhered to the surface of the first electrode tab 31 on the side facing away from the first adapter 21. During the production process, workers can easily cut the insulating tape according to the predetermined position and size, and then accurately adhere it to the first electrode tab 31. No complex molds or equipment are required, making it easy to achieve large-scale production and effectively improving production efficiency.

[0062] Alternatively, the first adhesive element 4 can be an insulating layer formed on the surface of the first tab 31 opposite to the first adapter 21 through injection molding. This allows for precise control of the shape, size, and thickness of the insulating layer, ensuring a high degree of consistency in the insulating layer of each battery cell. Simultaneously, the injection-molded insulating layer forms a unified whole with the surface of the tab 32, exhibiting high robustness. The bonding force between the insulating layer and the first tab 31 is strong, making it less prone to detachment or loosening.

[0063] In some embodiments of this application, please continue to refer to Figure 1. The cover plate assembly 2 includes a cover plate 23, on which a first electrode post hole 231 extending along its thickness direction is formed. The first electrode post 22 passes through the first electrode post hole 231. The battery cell also includes a first insulating member 5, which is disposed between the first electrode post 22 and the first electrode post hole 231. The first insulating member 5 can directly isolate the metallic first electrode post 22 and the cover plate 23, preventing short circuits caused by contact or insufficient spacing between them.

[0064] Referring to Figures 1, 2, and 4, the second tab 32 of the electrode assembly 3 is welded to the second adapter 24 or the second terminal post 25 of the cover plate assembly 2, forming a second weld 241. The battery cell also includes a second adhesive piece 6, which is attached to the second weld 241. The distance between the second adhesive piece 6 and the root of the second tab 32 is d2, where d2 > 0 mm. This achieves the same technical effect as the distance between the first adhesive piece 4 and the root of the first tab 31, where d1 > 0 mm, and will not be described further here.

[0065] The distance d2 between the second adhesive piece 6 and the root of the second electrode tab 32 satisfies: 1mm ≤ d2 ≤ 2mm. The second electrode tabs 32 of two adjacent electrode assemblies 3 are welded to the second adapter 24 of the cover plate assembly 2, forming two second weld seams 241. The second adhesive piece 6 can be simultaneously adhered to both second weld seams 241. The second adhesive piece 6 has the same technical features as the first adhesive piece 4 in the aforementioned technical solutions and achieves the same technical effect, which will not be elaborated further here.

[0066] In some embodiments of this application, please continue to refer to Figure 1. A second electrode post hole 232 is formed on the cover plate 23, extending along its thickness direction, and the second electrode post 25 passes through the second electrode post hole 232. The battery cell also includes a second insulating member 7, which is disposed between the second electrode post 25 and the second electrode post hole 232. It achieves the same technical effect as the first insulating member 5, and will not be described further here.

[0067] It should be noted that in the battery cell structure, the first terminal 22 passes through the first terminal hole 231 of the cover plate 23. When the terminal (first terminal 22 and second terminal 25) is inverted, the terminal originally located at the top of the battery cell becomes downward. Correspondingly, the cover plate 23 is also located at the bottom of the battery cell. That is to say, when the opening 11 is opened at the top of the housing 1, the cover plate assembly 2 is also installed at the top of the housing 1, and the terminal extends upward out of the housing 1. Similarly, when the opening 11 is opened at the bottom of the housing 1, the cover plate assembly 2 is also installed at the bottom of the housing 1, and the terminal extends downward out of the housing 1.

[0068] In some embodiments of this application, a battery pack is also provided, which includes battery cells as described in any of the above technical solutions. Since the battery cells in the battery pack provided in this application have the same technical features as the aforementioned battery cells, they can solve the same technical problems and achieve the same technical effects.

[0069] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0070] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery cell, characterized in that, The battery cell includes: a housing; a cover plate assembly disposed at the opening of the housing; an electrode assembly disposed inside the housing; a first tab of the electrode assembly being welded to a first adapter or a first terminal post of the cover plate assembly to form a first weld; and a first adhesive piece being adhered to the first weld, wherein the distance between the first adhesive piece and the root of the first tab is d1, where d1 > 0 mm.

2. The battery cell according to claim 1, characterized in that, The first adhesive has a first edge adjacent to the root of the first tab, the distance between the first edge and the root of the first tab being d1, wherein 1mm≤d1≤2mm.

3. The battery cell according to claim 1, characterized in that, The electrode assembly has at least two electrodes, and the first tabs of two adjacent electrode assemblies are welded to the first adapter of the cover plate assembly to form two first welds. The first adhesive is simultaneously attached to the two first welds.

4. The battery cell according to claim 3, characterized in that, The first adhesive has a first edge and a second edge disposed opposite to each other; the distance between the first edge and the root of the first tab of one of the two adjacent electrode assemblies is d1, and the distance between the second edge and the root of the first tab of the other of the two adjacent electrode assemblies is d1, wherein d1 > 0 mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The first adhesive completely covers the first weld.

6. The battery cell according to claim 1, characterized in that, The first adhesive element is made of insulating material.

7. The battery cell according to claim 1, characterized in that, The first adhesive piece is made of a transparent material.

8. The battery cell according to claim 1, characterized in that, The cover plate assembly includes: a cover plate, wherein a through first electrode hole is formed on the cover plate, and the first electrode is inserted into the first electrode hole; wherein the battery cell further includes a first insulating member, which is disposed between the first electrode and the first electrode hole.

9. The battery cell according to claim 1, characterized in that, The second tab of the electrode assembly is welded to the second adapter or second pole of the cover plate assembly to form a second weld; the battery cell further includes a second adhesive piece, which is attached to the second weld, and the distance between the second adhesive piece and the root of the second tab is d2, wherein d2 > 0 mm.

10. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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