Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and belongs to the technical field of batteries. The single battery comprises a cover plate assembly and an electrode assembly, the cover plate assembly has a thickness direction, and the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction; the cover plate assembly comprises a cover plate body, a pole and a connecting block; an assembly hole is formed in the cover plate body in the thickness direction; the pole comprises a main body part, a first connecting part and a second connecting part, the main body part penetrates through the assembly hole, the first connecting part is arranged on the side, away from the electrode assembly, of the cover plate body and connected with the main body part, the second connecting part is arranged at the end, away from the first connecting part, of the main body part in the thickness direction, and the second connecting part and the main body part are connected to define a limiting groove; the connecting block is arranged between the cover plate body and the electrode assembly and is partially embedded in the limiting groove; the cover plate body is clamped between the first connecting part and the connecting block. The cover plate assembly is simple in structure and high in assembling efficiency.

Description

Technical Field

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

[0002] The cover assembly in a battery mainly consists of terminals, the cover body, and sealing rings. However, currently, the components in the cover assembly have complex structures, and the terminals cannot be machined in one step, requiring secondary processing, resulting in low assembly efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide a single battery cell, which aims to overcome the technical problems of complex component structures, inability to be processed in one step, and low assembly efficiency. Another purpose of this application is to provide a battery pack.

[0004] Technical solution: This application discloses a single cell battery, including: a cover plate assembly and an electrode assembly, wherein the cover plate assembly has a thickness direction, and the electrode assembly is disposed on one side of the cover plate assembly along the thickness direction;

[0005] The cover plate assembly includes:

[0006] The cover plate body has assembly holes along the thickness direction;

[0007] The electrode post includes a main body, a first connecting part, and a second connecting part. The main body is inserted into the assembly hole. The first connecting part is located on the side of the cover plate body away from the electrode assembly and is connected to the main body. The second connecting part is located at the end of the main body away from the first connecting part along the thickness direction. The second connecting part is connected to the main body and forms a limiting groove.

[0008] A connecting block is disposed between the cover plate body and the electrode assembly, and is partially embedded in the limiting groove;

[0009] The cover plate body is sandwiched between the first connecting part and the connecting block.

[0010] In some embodiments, the connecting block includes a first protrusion located on the side of the connecting block facing the second connecting portion, and the first protrusion is embedded in the limiting groove;

[0011] The first protrusion has a first stepped surface, which is located on the side of the first protrusion away from the cover plate body;

[0012] The limiting groove has a second stepped surface, which is disposed opposite to the first stepped surface so that the first stepped surface can abut against the second stepped surface.

[0013] In some embodiments, the portion of the first step surface that contacts the second step surface has a first dimension W1 mm ​​along the radial direction of the assembly hole, satisfying W1≥0.15.

[0014] In some embodiments, along the thickness direction, the connecting block has a second dimension H mm, satisfying H ≥ 0.8;

[0015] Along the thickness direction, the first protrusion has a minimum dimension H1 mm, satisfying 0.2≤H1≤H.

[0016] In some embodiments, the main body portion has a third dimension W mm along the radial direction of the mounting hole, satisfying W≥1.8;

[0017] Along the radial direction of the mounting hole, the second connecting portion has a maximum dimension W2 mm, satisfying 0.8 ≤ W2 < W.

[0018] In some embodiments, the connecting block includes a second protrusion, which protrudes from the side of the connecting block away from the cover plate body. The second protrusion and the first protrusion form a recessed groove. Along the thickness direction, the recessed groove has a fourth dimension H2 mm, satisfying H2≥0.15.

[0019] In some embodiments, the main body portion has a through first hole along the thickness direction, and the second connecting portion has a through second hole along the thickness direction, the second hole communicating with the first hole;

[0020] The cover plate assembly further includes a connecting piece, which is electrically connected to the electrode assembly. The connecting piece passes through the second hole and the first hole along the thickness direction and covers the first hole.

[0021] In some embodiments, the cover plate assembly includes an upper plastic, a lower plastic, and a sealing ring. The upper plastic and the lower plastic are respectively disposed on opposite sides of the cover plate body along the thickness direction. The upper plastic connects the first connecting portion and the cover plate body, and the lower plastic connects the cover plate body and the connecting block. The sealing ring includes a first sealing segment and a second sealing segment connected together. The first sealing segment is disposed between the main body portion and the cover plate body, and sandwiched between the first connecting portion and the lower plastic. The second sealing segment is sandwiched between the cover plate body and the first connecting portion.

[0022] In some embodiments, the lower plastic and the main body have a first gap G1 mm, satisfying G1≥0.1, and the sealing ring and the upper plastic have a second gap G2 mm, satisfying G2≥0.25.

[0023] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0024] Beneficial Effects: The single-cell battery in this embodiment includes a cover plate assembly and an electrode assembly. The cover plate assembly has a thickness direction, and the electrode assembly is disposed on one side of the cover plate assembly along the thickness direction. The cover plate assembly includes a cover plate body, an electrode post, and a connecting block. The cover plate body has an assembly hole along the thickness direction. The electrode post includes a main body, a first connecting part, and a second connecting part. The main body passes through the assembly hole. The first connecting part is disposed on the side of the cover plate body away from the electrode assembly and connects to the main body. The second connecting part is disposed at the end of the main body away from the first connecting part along the thickness direction. The second connecting part connects to the main body and forms a limiting groove. The connecting block is disposed between the cover plate body and the electrode assembly and is partially embedded in the limiting groove. The cover plate body is sandwiched between the first connecting part and the connecting block and connects the first connecting part and the connecting block respectively. By forming a limiting fit between the connecting block and the limiting groove, the electrode post and the connecting block can jointly clamp and fix the cover plate body. The cover plate assembly has a simple structure and high assembly efficiency.

[0025] The battery pack of this application embodiment includes the single battery cell as described in the above embodiments. Therefore, it can have all the technical features and effects of the single battery cell described above, which will not be repeated here. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a three-dimensional structural diagram of the cover plate assembly in a single battery cell according to an embodiment of this application;

[0028] Figure 2 This is a top view of the cover plate assembly in a single battery cell according to an embodiment of this application;

[0029] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0030] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0031] Figure 5 for Figure 4 A magnified view of a portion of point C in the middle;

[0032] Figure 6This is a three-dimensional structural diagram of the electrode post in a single cell of an embodiment of this application;

[0033] Figure 7 for Figure 3 Cross-sectional view of the central pole;

[0034] Figure 8 for Figure 3 Cross-sectional view of the connecting block;

[0035] Reference numerals: 1. Cover plate assembly; X, thickness direction; 11. Cover plate body; 12. Pole post; 121. Main body; 122. First connecting part; 123. Second connecting part; 124. Limiting groove; 13. Connecting block; 131. First protrusion; 1311. First stepped surface; 1241. Second stepped surface; Y, radial direction; 132. Second protrusion; 133. Slot; 1210. First hole; 1230. Second hole; 14. Connecting piece; 15. Upper plastic; 16. Lower plastic; 17. Sealing ring; 171. First sealing section; 172. Second sealing section. Detailed Implementation

[0036] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "multiple" means two or more, and "at least one" can refer to one, two, or more, unless otherwise explicitly specified. The terms "first," "second," and "third," etc., are only for the convenience of description and are used to name parts or embodiments by number, and do not imply any order of importance between the parts or embodiments.

[0038] It should also be noted that in the accompanying drawings of this application, the arrow marked X indicates the thickness direction, and the arrow marked Y indicates the radial direction. The introduction of the thickness and radial directions in this application's description is to more clearly define the structure and relative positional relationships of the components within the individual battery cell and battery pack. In actual implementation, the thickness and radial directions intersect. Optionally, the thickness and radial directions are perpendicular to each other to optimize the layout of the individual battery cell and battery pack. In this application's description, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular; for example, an angle between 80° and 100° is considered perpendicular.

[0039] As a preamble to the embodiments of this application, the cover assembly in the battery mainly consists of terminals, a cover body, and a sealing ring. However, currently, the components in the cover assembly have complex structures. Terminals cannot be machined in one step and require secondary processing, resulting in low assembly efficiency and complex procedures, leading to high costs and defect rates. Furthermore, the terminals are solid structures with significant weight, increasing the overall weight of the assembled battery pack and reducing its competitiveness.

[0040] In view of this, embodiments of this application provide a single-cell battery, which aims to solve at least one of the above-mentioned technical problems.

[0041] The single-cell battery of this application embodiment includes: a cover plate assembly 1 and an electrode assembly. The cover plate assembly 1 has a thickness direction X, and the electrode assembly is disposed on one side of the cover plate assembly 1 along the thickness direction X. It should be understood that the single-cell battery also includes a housing, the housing having a receiving cavity and an opening. The cover plate assembly 1 is used to cover the opening and seal the electrode assembly in the receiving cavity, thereby playing a protective role. At the same time, the cover plate assembly 1 is also used to realize the current of the electrode assembly inside the housing to the outside of the housing.

[0042] For details, please refer to Figures 1 to 8 As shown, the cover plate assembly 1 includes: a cover plate body 11, an electrode post 12, and a connecting block 13; wherein, the cover plate body 11 has an assembly hole along the thickness direction X; the electrode post 12 includes a main body 121, a first connecting part 122, and a second connecting part 123, the main body 121 is inserted into the assembly hole, the first connecting part 122 is disposed on the side of the cover plate body 11 away from the electrode assembly and is connected to the main body 121, the second connecting part 123 is disposed at the end of the main body 121 along the thickness direction X away from the first connecting part 122, the second connecting part 123 is connected to the main body 121 and forms a limiting groove 124; the connecting block 13 is disposed between the cover plate body 11 and the electrode assembly and is partially embedded in the limiting groove 124; the cover plate body 11 is sandwiched between the first connecting part 122 and the connecting block 13.

[0043] It should be understood that the main body 121 and the second connecting part 123 form a limiting groove 124. A connecting block 13 is embedded in the limiting groove 124, creating a limiting fit between the connecting block 13 and the limiting groove 124. This allows the pole post 12 and the connecting block 13 to jointly clamp and fix both sides of the cover plate body 11 along the thickness direction X. The connecting block 13 limits the lower side of the cover plate body 11, while the first connecting part 122 limits the upper side of the cover plate body 11. The main body 121 supports and connects the first connecting part 122 and the connecting block 13. The pole post 12 is formed by one-time stamping, resulting in a simple structure, high assembly efficiency, and high stability and reliability in the connection between the pole post 12 and the cover plate body 11.

[0044] Please see Figure 5 , Figure 7 and Figure 8 As shown, in some embodiments, the connecting block 13 includes a first protrusion 131, which is located on the side of the connecting block 13 facing the second connecting portion 123, and is embedded in the limiting groove 124; the first protrusion 131 has a first stepped surface 1311, which is located on the side of the first protrusion 131 away from the cover plate body 11; the limiting groove 124 has a second stepped surface 1241, which is disposed opposite to the first stepped surface 1311 so that the first stepped surface 1311 can abut against the second stepped surface 1241. It should be understood that the connecting block 13 is embedded in the limiting groove 124 through the first protrusion 131 to form a limiting fit with the limiting groove 124; furthermore, the first stepped surface 1311 of the first protrusion 131 forms an abutting fit with the second stepped surface 1241 in the limiting groove 124 to make the connecting block 13 and the pole post 12 firmly assembled, further ensuring the clamping and fixing effect on the cover plate body 11.

[0045] In some embodiments, the second step surface 1241 has an angle α (not shown in the figure) with the thickness direction X, satisfying 15°≤a≤75°. Specifically, the angle α can be any value among 15°, 25°, 35°, 45°, 55°, 65°, and 75°, or a range between any two adjacent values. It should be understood that the second step surface 1241 is in contact with the first step surface 1311, and the angle setting increases the contact area between the connecting block 13 and the second connecting part 123, increases the friction, improves the connection stability, and ensures the connection strength; on the other hand, the gravity of the connecting block 13 can achieve a self-locking function to prevent the connecting block 13 from accidentally sliding out; the larger the angle α, the more tightly the connecting block 13 can be engaged in the limiting groove 124, which can save space.

[0046] Please see Figure 5As shown, in some embodiments, the portion of the first stepped surface 1311 and the second stepped surface 1241 that contact each other has a first dimension W1 mm ​​along the radial direction Y of the assembly hole, satisfying W1≥0.15. It should be understood that the first dimension W1 is greater than or equal to 0.15 mm, which can ensure the limiting fit between the connecting block 13 and the limiting groove 124, avoid unstable force and slippage at the contact position, and at the same time ensure the connection strength between the connecting block 13 and the pole post 12.

[0047] Please continue reading. Figure 5 As shown, in some embodiments, along the thickness direction X, the connecting block 13 has a second dimension H mm, satisfying H ≥ 0.8; along the thickness direction X, the first protrusion 131 has a minimum dimension H1 mm, satisfying 0.2 ≤ H1 ≤ H. It should be understood that the second dimension being greater than or equal to 0.8 mm ensures the structural strength of the connecting block 13 itself, guaranteeing support for one side of the cover plate body 11; H1 being greater than or equal to 0.2 mm ensures the structural strength of the first protrusion 131, preventing stress concentration and breakage at the point where the first protrusion 131 mates with the limiting groove 124, thus ensuring the reliability of the connection between the connecting block 13 and the electrode post 12. Furthermore, H1 being less than or equal to H saves internal space in the housing, reduces the distance between the connecting block 13 and the electrode assembly, and improves space utilization.

[0048] Please continue reading. Figure 5 As shown, in some embodiments, along the radial direction Y of the assembly hole, the main body 121 has a third dimension W mm, satisfying W ≥ 1.8; along the radial direction Y of the assembly hole, the second connecting part 123 has a maximum dimension W2 mm, satisfying 0.8 ≤ W2 < W. The third dimension W is greater than or equal to 1.8 mm to ensure the structural strength of the pole post 12; W2 is greater than or equal to 0.8 mm to ensure the connection strength between the second connecting part 123 and the main body 121, preventing deformation of the second connecting part 123 after the connecting block 13 is embedded in the limiting groove 124, which would cause the opening of the limiting groove 124 to become larger, thereby destroying the limiting effect of the limiting groove 124 on the connecting block 13 and affecting the stability and reliability of the pole post 12 assembly. Furthermore, W2 is less than or equal to W to save materials and reduce space occupation.

[0049] Please see Figure 5As shown, in some embodiments, the connecting block 13 includes a second protrusion 132, which protrudes from the side of the connecting block 13 away from the cover plate body 11. The second protrusion 132 and the first protrusion 131 form a groove 133. Along the thickness direction X, the groove 133 has a fourth dimension H2 mm, satisfying H2≥0.15. It should be understood that the welding connection between the first step surface 1311 and the second step surface 1241 will produce a weld. The weld formed by welding the first step surface 1311 and the second step surface 1241 can be contained within the groove 133, which protects the welded part and prevents the weld from protruding from the connecting block 13 and the second connecting part 123. Therefore, the weld will not interfere with the interior of the single cell, improving the safety of the single cell and ensuring the welding life and welding strength of the welded part.

[0050] Please see Figure 6 and Figure 7 As shown, in some embodiments, the main body 121 has a through hole 1210 along the thickness direction X, and the second connecting part 123 has a through hole 1230 along the thickness direction X, the second hole 1230 communicating with the first hole 1210; the cover plate assembly 1 also includes a connecting piece 14, the connecting piece 14 being electrically connected to the electrode assembly, the connecting piece 14 passing through the second hole 1230 and the first hole 1210 along the thickness direction X, and covering the first hole 1210. It should be understood that the presence of the first hole 1210 in the main body 121 and the second hole 1230 communicating with the first hole 1210 in the second connecting part 123 can reduce the weight of the electrode post 12 itself. The connecting piece 14 can cover the first hole 1210, and at the same time, the connecting piece 14 can pass through the second hole 1230 and extend into the housing, serving to connect the electrode tab. Simultaneously, this connection method reduces the number of parts in the cover plate, improves assembly efficiency, ultimately reducing the weight and production cost of the battery product, and enhancing the product's competitiveness. It should be understood that the inner walls of the first hole 1210 and the second hole 1230 may have chamfers at both ends along the thickness direction X, so as to facilitate the assembly of the connecting piece 14.

[0051] In some embodiments, the second connecting portion 123 may be a feature formed by thinning the main body portion 121. During the assembly of the pole post 12 and the cover plate body 11, the first hole 1210 and the second hole 1230 are punched through by an external stamping device, and the second connecting portion 123 and the main body portion 121 are formed into a limiting groove 124 by outward extrusion, so as to limit and fix the connecting block 13 below the cover plate body 11, thereby realizing the riveting fit between the pole post 12 and the connecting block 13. The pole post 12 of this application has a simple structure, and the connection strength between the pole post 12 and the cover plate body 11 is high and the stability is good. The assembly process is simple, without complicated assembly procedures, saving time and increasing efficiency, and reducing costs.

[0052] Please see Figure 3and Figure 4 As shown, in some embodiments, the cover plate assembly 1 includes an upper plastic 15, a lower plastic 16, and a sealing ring 17. The upper plastic 15 and the lower plastic 16 are respectively disposed on opposite sides of the cover plate body 11 along the thickness direction X. The upper plastic 15 connects the first connecting part 122 and the cover plate body 11, and the lower plastic 16 connects the cover plate body 11 and the connecting block 13. The sealing ring 17 includes a first sealing section 171 and a second sealing section 172 connected together. The first sealing section 171 is disposed between the main body part 121 and the cover plate body 11, and sandwiched between the first connecting part 122 and the lower plastic 16. The second sealing section 172 is sandwiched between the cover plate body 11 and the first connecting part 122. It should be understood that the sealing ring 17 can be L-shaped. The first sealing section 171 achieves the seal between the main body part 121 and the cover plate body 11, and the second sealing section 172 achieves the seal between the cover plate body 11 and the first connecting part 122. During the assembly of the pole post 12, the upper plastic 15 and the sealing ring 17 are first fixed above the cover plate body 11. The first sealing section 171 passes through the assembly hole, and the second sealing section 172 overlaps the cover plate body 11. The lower plastic 16 and the connecting block 13 are fixed below the cover plate body 11. The pole post 12 passes through the assembly hole and is pressed onto the upper plastic 15 and the second sealing section 172. The second connecting part 123 is stamped with an external stamping device to form a limiting fit with the connecting block 13, thereby completing the assembly of the pole post 12. The upper plastic 15, the lower plastic 16, and the sealing ring 17 can ensure the reliability, insulation, and sealing of the connection between the pole post 12 and the cover plate body 11.

[0053] Please see Figure 4 As shown, in some embodiments, there is a first gap G1 mm between the lower plastic 16 and the main body 121, satisfying G1≥0.1, and a second gap G2 mm between the sealing ring 17 and the upper plastic 15, satisfying G2≥0.25. The first gap G1 is greater than or equal to 0.1 mm, ensuring that the pole post 12 has sufficient expansion deformation space when the second connecting part 123 is stamped and deformed, preventing the pole post 12 from squeezing and damaging the lower plastic 16. The second gap G2 is greater than or equal to 0.25 mm, ensuring that the sealing ring 17 has sufficient elastic deformation space when compressed, preventing damage to the upper plastic 15 when the sealing ring 17 is compressed.

[0054] This application also discloses a battery pack comprising a single battery cell as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery cell, which will not be repeated here.

[0055] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0056] The present application provides a detailed description of a single battery cell and a battery pack, and uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell characterized by, The utility model relates to a cover plate assembly (1) and electrode assembly, the cover plate assembly (1) has thickness direction (X), the electrode assembly is arranged in the cover plate assembly (1) one side along the thickness direction (X); The cover plate assembly (1) comprises: Cover plate body (11), the assembly hole is opened along the thickness direction (X); Pole (12), including main part (121), first connecting part (122) and second connecting part (123), the main part (121) is worn in the assembly hole, the first connecting part (122) is arranged in the cover plate body (11) far from the electrode assembly one side, and is connected the main part (121), the second connecting part (123) is arranged in the main part (121) far from the first connecting part (122) one end along the thickness direction (X), and the second connecting part (123) is connected with the main part (121) and surrounds the limiting groove (124); Connecting block (13) is arranged between the cover plate body (11) and the electrode assembly, and is partially embedded in the limiting groove (124); The cover plate body (11) is clamped between the first connecting part (122) and the connecting block (13). The connecting block (13) includes first convex part (131), and the first convex part (131) is located on the side of the connecting block (13) towards the second connecting part (123), and the first convex part (131) is embedded in the limiting groove (124); 2. The cell according to claim 1, wherein The first convex part (131) has first step surface (1311), and the first step surface (1311) is located on the side of the first convex part (131) away from the cover plate body (11); The limiting groove (124) has second step surface (1241), and the second step surface (1241) is arranged opposite to the first step surface (1311), so that the first step surface (1311) can abut against the second step surface (1241). The part of the first step surface (1311) and the second step surface (1241) mutually contacted has the first size W1 mm along the radial direction (Y) of the assembly hole, and satisfies W1=0.

15.

3. The cell according to claim 2, wherein Along the thickness direction (X), the connecting block (13) has the second size H mm, and satisfies H=0.8; 4. The cell according to claim 2, wherein Along the thickness direction (X), the first convex part (131) has the minimum size H1 mm, and satisfies 0.2=H. Along the radial direction (Y) of the assembly hole, the main part (121) has the third size W mm, and satisfies W=1.8; 5. The cell according to claim 2, wherein Along the radial direction (Y) of the assembly hole, the second connecting part (123) has the maximum size W2 mm, and satisfies 0.8=W2 ​ 6. The cell according to claim 2, wherein The connecting block (13) comprises a second protrusion (132) protruding from a side of the connecting block (13) away from the cover plate body (11), the second protrusion (132) and the first protrusion (131) form a sink (133), the sink (133) has a fourth size H2 mm in the thickness direction (X), and H2≥0.15 is satisfied.

7. The cell according to claim 1, wherein The main body part (121) is provided with a first hole (1210) penetrating in the thickness direction (X), and the second connecting part (123) is provided with a second hole (1230) penetrating in the thickness direction (X), the second hole (1230) is in communication with the first hole (1210); The cover plate assembly (1) further comprises a connecting sheet (14) electrically connected with the electrode assembly, the connecting sheet (14) penetrates the second hole (1230) and the first hole (1210) in the thickness direction (X) and covers the first hole (1210).

8. The cell according to claim 1, wherein The cover plate assembly (1) comprises an upper plastic (15), a lower plastic (16) and a sealing ring (17), the upper plastic (15) and the lower plastic (16) are respectively arranged on opposite sides of the cover plate body (11) in the thickness direction (X), the upper plastic (15) connects the first connecting part (122) and the cover plate body (11), the lower plastic (16) connects the cover plate body (11) and the connecting block (13), the sealing ring (17) comprises a first sealing section (171) and a second sealing section (172) connected with each other, the first sealing section (171) is arranged between the main body part (121) and the cover plate body (11) and clamped between the first connecting part (122) and the lower plastic (16), and the second sealing section (172) is clamped between the cover plate body (11) and the first connecting part (122).

9. The cell according to claim 8, wherein The lower plastic (16) and the main body part (121) have a first gap G1 mm, and G1≥0.1 is satisfied, and the sealing ring (17) and the upper plastic (15) have a second gap G2 mm, and G2≥0.25 is satisfied.

10. A battery pack, characterized by, The single battery comprises any one of the single batteries in claims 1-9. The single battery comprises any one of the single batteries in claims 1-9.

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