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 electrode assembly is arranged on one side of the cover plate assembly in the first direction, and the electrode assembly comprises a tab; the cover plate assembly comprises a cover plate body, a connecting block and a pole, wherein the cover plate body is provided with an assembling hole along a first direction; the connecting block is arranged on the side, facing the electrode assembly, of the cover plate body, and a through hole is formed in the connecting block in the first direction; the pole comprises a first convex part, a main body part and a second convex part, the main body part penetrates through the assembly hole and is connected with the connecting block, the first convex part is embedded into the through hole, is connected with the inner wall of the through hole and seals the through hole, and the main body part is respectively connected with the first convex part and the second convex part; and the cover plate body is clamped between the second connecting part and the pole. According to the cover plate assembly, the pole is connected with the connecting block and seals the through hole, so that assembling parts of the cover plate assembly are reduced, and the space utilization rate is improved through the multi-convex-part design of the pole.

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 plate assembly in the battery is mainly composed of terminal posts, cover plate body, connecting piece welding block, etc. The existing cover plate assembly has many parts and occupies a lot of space, resulting in low space utilization. Utility Model Content

[0003] The purpose of this utility model is to provide a single battery cell, which aims to overcome the technical problem that the current cover plate assembly has many parts, occupies a lot of space, and has a low space utilization rate; another purpose of this application is to provide a battery pack.

[0004] Technical solution: This application provides a single cell battery, including: a cover plate assembly and an electrode assembly, the cover plate assembly having intersecting first and second directions, the electrode assembly being disposed on one side of the cover plate assembly along the first direction, and the electrode assembly including tabs;

[0005] The cover plate assembly includes:

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

[0007] A connecting block is disposed on the side of the cover plate body facing the electrode assembly, and the connecting block has a through hole along the first direction;

[0008] The electrode post includes a first protrusion, a main body, and a second protrusion. The second protrusion is located on the side of the cover plate body away from the electrode assembly. The main body passes through the assembly hole and is connected to the connecting block. The first protrusion is embedded in the through hole and is connected to the inner wall of the through hole and seals the through hole. The main body is connected to the first protrusion and the second protrusion respectively.

[0009] The cover plate body is sandwiched between the second protrusion and the connecting block.

[0010] In some embodiments, the connecting block includes a first connecting portion, a second connecting portion, and a bending portion, wherein the bending portion is located between the first connecting portion and the second connecting portion and connects the first connecting portion and the second connecting portion respectively, and the through hole passes through the second connecting portion along a first direction.

[0011] In some embodiments, the bending portion includes a plurality of bending segments, which are spaced apart along a second direction.

[0012] In some embodiments, along a first direction, the second connecting portion includes a body portion, a first mating portion, and a second mating portion connected in sequence. A first hole passes through the body portion, the first mating portion, and the second mating portion. The body portion is connected to the bending portion. The first mating portion has a first limiting surface facing the cover plate body. The cover plate body is sandwiched between the second protrusion and the first limiting surface. The second mating portion has a second limiting surface facing the pole post. The second limiting surface is connected to the body portion.

[0013] In some embodiments, along the second direction, the cross-sectional area of ​​the first protrusion is not less than 1.5 mm. 2 .

[0014] In some embodiments, the second protrusion has a third limiting surface facing the cover plate body, the cover plate body is sandwiched between the third limiting surface and the connecting block, and the main body has a fourth limiting surface facing the connecting block, the fourth limiting surface being connected to the connecting block.

[0015] In some embodiments, the cover plate assembly further includes a sealing ring, which includes a first sealing section, a second sealing section and a third sealing section. The first sealing section is disposed between the cover plate body and the pole post, the second sealing section is disposed between the cover plate body and the connecting block, and the third sealing section is disposed between the pole post and the connecting block. The first sealing section is connected to the second sealing section and the third sealing section respectively.

[0016] In some embodiments, a groove is provided on the side of the cover plate body facing the connecting block, and the second sealing section is disposed in the groove.

[0017] In some embodiments, the cover plate assembly further includes an upper plastic layer disposed on the side of the cover plate body opposite to the electrode assembly, and the upper plastic layer connects the electrode post to the cover plate body.

[0018] Accordingly, this application also provides a battery pack, including the single battery cells as described in the above embodiments.

[0019] Beneficial Effects: This application provides a single-cell battery, comprising: a cover plate assembly and an electrode assembly. The cover plate assembly has intersecting first and second directions. The electrode assembly is disposed on one side of the cover plate assembly along the first direction and includes a tab. The cover plate assembly includes: a cover plate body, a connecting block, and a terminal post. The cover plate body has an assembly hole along the first direction. The connecting block is disposed on the side of the cover plate body facing the electrode assembly and has a through hole along the first direction. The terminal post includes a first protrusion, a main body, and a second protrusion. The second protrusion is disposed on the side of the cover plate body away from the electrode assembly. The main body passes through the assembly hole and connects to the connecting block. The first protrusion is embedded in the through hole and connects to the inner wall of the through hole, sealing the through hole. The main body is connected to the first and second protrusions respectively. The cover plate body is sandwiched between the second protrusion and the connecting block. This application reduces the number of assembly parts in the cover plate assembly by connecting the terminal post to the connecting block and sealing the through hole, thereby improving space utilization. Furthermore, the multi-protrusion design of the terminal post reduces the space occupied by the cover plate assembly, further improving space utilization.

[0020] 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

[0021] 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.

[0022] Figure 1 This is a three-dimensional structural diagram of a single battery cell according to an embodiment of this application;

[0023] Figure 2 This is a top view of the cover plate assembly in a single battery cell according to an embodiment of this application;

[0024] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0025] Figure 4 This is a cross-sectional schematic diagram of the cover plate assembly in a single battery cell according to an embodiment of this application;

[0026] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle;

[0027] Figure 6 This is a three-dimensional structural diagram of the cover plate assembly in a single battery cell according to an embodiment of this application, viewed from below.

[0028] Figure 7 This is a cross-sectional schematic diagram of the pole piece in an embodiment of this application;

[0029] Figure 8 This is a cross-sectional schematic diagram of the connecting block in an embodiment of this application.

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

[0031] 10-Cover plate assembly; 11-Cover plate body; 111-Sinking groove; 1111-Fifth limiting surface; 12-Electrode post; 121-Main body; 1211-Fourth limiting surface; 122-First protrusion; 123-Second protrusion; 1231-Third limiting surface; 124-First composite layer; 125-Second composite layer; 13-Connecting block; 131-Through hole; 132-First connecting part; 133-Second connecting part; 1331-Main body; 1332-First mating part; 13321-First limiting surface; 1333-Second mating part; 13331-Second limiting surface; 134-Bending part; 1341-Bending section; 14-Sealing ring; 141-First sealing section; 142-Second sealing section; 143-Third sealing section; 15-Upper plastic; 20-Electrode assembly; 21-Electrode tab. 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 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.

[0033] 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.

[0034] It should also be noted that in the accompanying drawings of this application, an arrow marked X indicates the first direction, an arrow marked Y indicates the second direction, and an arrow marked Z indicates the third direction. The introduction of the first direction, second direction, and third direction in the description of this application is to more clearly define the structure and relative positional relationships of the components in the individual battery cell and battery pack. In actual implementation, the first direction, second direction, and third direction intersect. Optionally, the first direction, second direction, and third direction are perpendicular to each other to optimize the layout of the individual battery cell and battery pack. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular; for example, an angle between 80° and 100° is considered perpendicular. The first direction can be the thickness direction of the cover assembly, the second direction can be the length direction of the cover assembly, and the third direction can be the width direction of the cover assembly.

[0035] As a preamble to the embodiments of this application, the cover assembly in the battery is mainly composed of components such as terminals, cover body, and connecting blocks. However, currently, the cover assembly has many components, making assembly complex and inefficient. In particular, the terminals cannot be machined in one step and require secondary processing, resulting in a large number of components, low assembly efficiency, complex processes, and 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.

[0036] 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.

[0037] This application provides a single-cell battery, including: a cover plate assembly 10 and an electrode assembly 20. The cover plate assembly 10 has intersecting first direction X and second direction Y. The electrode assembly 20 is disposed on one side of the cover plate assembly 10 in the first direction X, and the electrode assembly 20 includes tabs 21. 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 10 is used to cover the opening and seal the electrode assembly 20 in the receiving cavity, thereby providing protection. At the same time, the cover plate assembly 10 is also used to allow the current of the electrode assembly 20 inside the housing to be led out to the outside of the housing.

[0038] Please see Figures 1 to 8As shown, the cover plate assembly 10 includes: a cover plate body 11 with an assembly hole along the first direction X; a connecting block 13 disposed on the side of the cover plate body 11 facing the electrode assembly 20, the connecting block 13 having a through hole 131 along the first direction X; and an electrode post 12, the electrode post 12 including a first protrusion 122, a main body 121 and a second protrusion 123, the second protrusion 123 being disposed on the side of the cover plate body 11 away from the electrode assembly 20, the main body 121 passing through the assembly hole and connected to the connecting block 13, the first protrusion 122 being embedded in the through hole 131 and connected to the inner wall of the through hole 131 and sealing the through hole 131, the main body 121 being connected to the first protrusion 122 and the second protrusion 123 respectively; and the cover plate body 11 being sandwiched between the second protrusion 123 and the connecting block 13.

[0039] It should be understood that this application reduces the number of assembly parts in the cover plate assembly 10 by connecting the pole post 12 to the connecting block 13 and sealing the through hole 131, thereby improving space utilization. Furthermore, the multi-protrusion design of the pole post reduces the space occupied by the cover plate assembly, further improving space utilization. Additionally, the second protrusion 123 can limit the upper side of the cover plate body 11, and the boss structure formed by the main body 121 and the first protrusion 122 makes it easier to assemble the pole post 12 with the connecting block 13. Due to the boss structure design, the pole post 12 can be directly embedded in the assembly hole and connected to the connecting block 13, thus simplifying the assembly process and improving assembly efficiency. The first protrusion 122 protrudes from the main body 121, allowing the pole post 12 to be embedded in the through hole 131 and connected to the inner wall of the through hole 131, thereby achieving a seal on the through hole 131 and improving sealing performance. Furthermore, the pole post 12 adopts a bottom boss structure, which can be processed in one step, reducing costs. Furthermore, the boss structure provides a larger contact area and connection points, enhancing the connection stability between the pole post 12 and the connecting block 13, reducing the risk of loosening or disconnection, and ensuring the reliability of the connection.

[0040] In some embodiments, the connecting block 13 includes a first connecting portion 132, a second connecting portion 133, and a bending portion 134. The bending portion 134 is located between the first connecting portion 132 and the second connecting portion 133 and connects the first connecting portion 132 and the second connecting portion 133 respectively. The through hole 131 passes through the second connecting portion 133 along the first direction X.

[0041] It is important to understand that by connecting the bendable first connecting part 132 to the tab 21 and then bending it towards the cover body 11, the space occupied by the cover assembly 10 is reduced, further improving space utilization. The connecting block 13 can limit the lower side of the cover body 11, while the pole post 12 can limit the upper side of the cover body 11. The pole post 12 and the connecting block 13 are formed by one-time stamping, resulting in a simple structure, high assembly efficiency, and one-time processing, reducing costs. Furthermore, eliminating the connecting piece and combining it with the welding block to form the connecting block 13 reduces internal resistance, welding processes, and components, lowering costs and improving product competitiveness. Additionally, the tab 21 is directly welded to the connecting block 13, and a busbar is welded to the side of the pole post 12 away from the connecting block 13 to allow the current inside the single cell to be led out, shortening the current flow path, reducing battery internal resistance, and improving product performance.

[0042] Please see Figure 2 , Figure 3 and Figure 6 As shown, in some embodiments, the bending portion 134 includes a plurality of bending segments 1341, which are arranged at intervals along the second direction Y.

[0043] It should be understood that in some embodiments, the tab 21 is bent by the bending portion 134. First, the first connecting portion 132 is bent 90 degrees toward the electrode assembly 20 and perpendicular to the second direction Y of the cover plate assembly 10, and then welded to the corresponding tab 21. This facilitates the connection between the side of the first connecting portion 132 away from the electrode assembly 20 and the tab 21. After welding, the first connecting portion 132 is rotated 90 degrees toward the cover plate body 11 with the tooling and kept flush with the plane of the cover plate assembly 10 toward the electrode assembly 20. The tab 21 is bent above the first connecting portion 132, reducing the bending space and improving space utilization. In addition, multiple bending segments 1341 are arranged at intervals along the second direction Y of the cover plate assembly 10, so that the stress of the connector is distributed among the bending segments 1341 when bending, avoiding stress concentration in one place and causing structural damage, effectively enhancing the stability of the entire connection structure during long-term use.

[0044] Please see Figure 4 , Figure 5 and Figure 8As shown, in some embodiments, along the first direction X, the second connecting portion 133 includes a body portion 1331, a first mating portion 1332, and a second mating portion 1333 connected in sequence. A through hole 131 passes through the body portion 1331, the first mating portion 1332, and the second mating portion 1333. The body portion 1331 is connected to the bending portion 134. The first mating portion 1332 has a first limiting surface 13321 facing the cover plate body 11. The cover plate body 11 is sandwiched between the second protrusion 123 and the first limiting surface 13321. The second mating portion 1333 has a second limiting surface 13331 facing the pole post 12. The second limiting surface 13331 is connected to the body portion 121.

[0045] It is important to understand that the first mating part 1332 is located between the body part 1331 and the second mating part 1333. The multi-layered structure of the second connecting part 133 allows for various internal connection relationships, improving space utilization and providing more functionality and convenience. The portion of the first mating part 1332 protruding from the second mating part has a first limiting surface 13321 facing the cover body 11. The first limiting surface 13321 is used to clamp the cover body 11, further ensuring the clamping and fixing effect on the cover body 11. The second limiting surface 13331 is used to connect with the pole post 12. This surface-to-surface connection ensures the stability and reliability of current transmission. The connecting block 13 is stepped along the first direction X, meaning that along the first direction X, the first mating part 1332 is higher than the body part 1331, and the second mating part 1333 is higher than the first mating part 1332. This results in a multi-layered stepped structure for the connecting block 13, enabling various connection relationships within a limited space. Through this multi-layered design, space can be effectively utilized in the vertical direction, thereby reducing the overall component volume.

[0046] Please see Figure 5 As shown, in some embodiments, the cross-sectional area of ​​the first protrusion 122 along the second direction Y of the cover plate assembly 10 is not less than 1.5 mm. 2 Furthermore, the cross-sectional area of ​​the first protrusion 122 may not exceed 150 mm². 2 Ensure sufficient flow area and boss strength.

[0047] Please see Figure 7 As shown, in some embodiments, the second protrusion 123 has a third limiting surface 1231 facing the cover plate body 11, the cover plate body 11 is sandwiched between the third limiting surface and the connecting block, and the main body 121 has a fourth limiting surface 1211 facing the connecting block 13, the fourth limiting surface 1211 is connected to the connecting block 13.

[0048] It should be understood that the portion of the second protrusion 123 protruding from the main body has a third limiting surface 1231 facing the cover plate body 11. The third limiting surface 1231 can limit the upper side of the cover plate body 11. The design of the third limiting surface 1231 provides mechanical support, allowing the cover plate body 11 to be stably connected to the pole post 12. The portion of the main body 121 protruding from the first protrusion 122 has a fourth limiting surface 1211 facing the connecting block 13. The fourth limiting surface 1211 is connected to the second limiting surface 13331, allowing the cover plate body 11 to be stably clamped between the first limiting surface 13321 and the third limiting surface 1231. This surface-to-surface connection ensures a stable connection between the pole post 12 and the connecting portion, and also ensures the stability and reliability of current transmission.

[0049] Please see Figure 4 and Figure 5 As shown, in some embodiments, the cover plate assembly 10 further includes a sealing ring 14, which includes a first sealing section 141, a second sealing section 142, and a third sealing section 143. The first sealing section 141 is disposed between the cover plate body 11 and the pole post 12, the second sealing section 142 is disposed between the cover plate body 11 and the connecting block 13, and the third sealing section 143 is disposed between the pole post 12 and the connecting block 13. The first sealing section 141 is connected to the second sealing section 142 and the third sealing section 143 respectively.

[0050] It should be noted that the first connecting part 132 is for mating with the pole lug 21 in the motor assembly, the first mating part 1332 is for mating with the cover plate body 11, and the second mating part 1333 is for mating with the pole post 12. The first sealing section 141 is disposed between the cover plate body 11 and the main body 121, the second sealing section 142 is disposed between the cover plate body 11 and the first limiting surface 13321, and the third sealing section 143 is disposed between the fourth limiting surface 1211 and the first limiting surface 13321. The sealing ring 14 is T-shaped. The first sealing section 141 achieves the seal between the cover plate body 11 and the main body 121, the second sealing section 142 achieves the seal between the cover plate body 11 and the connecting block 13, and the third sealing section 143 achieves the seal between the main body 121 and the connecting block 13.

[0051] Please see Figure 4 and Figure 5As shown, in some embodiments, the cover plate assembly 10 further includes an upper plastic 15, which is disposed on the side of the cover plate body 11 away from the electrode assembly 20, and the upper plastic 15 connects the electrode post 12 and the cover plate body 11. It should be noted that during the assembly of the pole post 12, the upper plastic 15 is first fixed above the cover plate body 11, and the sealing ring 14 is fixed below the cover plate body 11. The first sealing section 141 passes through the assembly hole, the second sealing section 142 overlaps the cover plate body 11, and the third sealing section 143 overlaps the fourth limiting surface 1211. The pole post 12 is then passed through the assembly hole and pressed onto the upper plastic 15 and the second sealing section 142. The fourth limiting surface 1211 is then 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 and the sealing ring 14 can ensure the reliability, insulation, and sealing of the connection between the pole post 12 and the cover plate body 11 and the connecting block 13, preventing the risk of air leakage from the welding pores in the through hole.

[0052] Please see Figure 4 As shown, in some embodiments, a recess 111 is provided on the side of the cover plate body 11 facing the connecting block 13, and the second sealing section 142 is disposed in the recess 111. It should be understood that by providing a recess 111 on the cover plate body 11 to accommodate the second sealing section 142, space utilization is improved, the height of the cover plate assembly 10 is reduced, thereby providing more space, increasing battery capacity, and improving product competitiveness.

[0053] Please see Figure 5 As shown, in some embodiments, the recess 111 has a fifth limiting surface 1111 facing the connecting block 13, and the fifth limiting surface 1111 and the fourth limiting surface 1211 are on the same plane. It should be understood that the fifth limiting surface 1111 and the fourth limiting surface 1211 are flush on the plane defined by the intersection of the second direction Y and the third direction Z of the cover plate assembly 10, which ensures that the fifth limiting surface 1111 and the fourth limiting surface 1211 are at the same height along the first direction X, ensuring that the compression of the sealing ring 14 is consistent and that the sealing ring 14 is compressed uniformly, thereby providing reliable sealing performance; and by keeping the two limiting surfaces at the same height, it is possible to ensure smooth contact between the pole post 12 and the connecting block 13, reduce structural deformation or loosening, and improve the stability and reliability of the overall structure.

[0054] In some embodiments, the electrode post 12 includes a first composite layer 124 and a second composite layer 125, which are stacked and connected along a first direction X. It should be understood that the electrode post 12 is a copper-aluminum composite electrode post 12. Along the first direction X, the second composite layer 125 faces the connecting block 13 and can be copper, while the first composite layer 124 is away from the connecting block 13 and can be aluminum. The copper-aluminum composite negative electrode post 12 has good electrothermal performance, corrosion resistance, wear resistance, and plasticity, and can meet the high-efficiency electronic characteristics and safety requirements of new energy batteries.

[0055] 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.

[0056] 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.

[0057] 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 battery, characterized in that, include: A cover plate assembly and an electrode assembly, wherein the cover plate assembly has intersecting first and second directions, and the electrode assembly is disposed on one side of the cover plate assembly along the first direction, and the electrode assembly includes a tab; The cover plate assembly includes: The cover plate body has an assembly hole along the first direction; A connecting block is disposed on the side of the cover plate body facing the electrode assembly, and the connecting block has a through hole along the first direction; The electrode post includes a first protrusion, a main body, and a second protrusion. The second protrusion is disposed on the side of the cover plate body away from the electrode assembly. The main body passes through the assembly hole and is connected to the connecting block. The first protrusion is embedded in the through hole and is connected to the inner wall of the through hole and seals the through hole. The main body is connected to the first protrusion and the second protrusion respectively. The cover plate body is sandwiched between the second protrusion and the connecting block.

2. The single-cell battery according to claim 1, characterized in that, The connecting block includes a first connecting part, a second connecting part, and a bending part. The bending part is located between the first connecting part and the second connecting part and connects the first connecting part and the second connecting part respectively. The through hole passes through the second connecting part along the first direction.

3. The single-cell battery according to claim 2, characterized in that, The bending portion includes multiple bending segments, which are arranged at intervals along a second direction.

4. The single-cell battery according to claim 2, characterized in that, Along the first direction, the second connecting portion includes a body portion, a first mating portion, and a second mating portion connected in sequence. The through hole passes through the body portion, the first mating portion, and the second mating portion. The body portion is connected to the bent portion. The first mating portion has a first limiting surface facing the cover plate body. The cover plate body is sandwiched between the second protrusion and the first limiting surface. The second mating portion has a second limiting surface facing the pole post. The second limiting surface is connected to the body portion.

5. The single-cell battery according to claim 4, characterized in that, Along the second direction, the cross-sectional area of ​​the first protrusion is not less than 1.5 mm. 2 .

6. The single-cell battery according to claim 1, characterized in that, The second protrusion has a third limiting surface facing the cover plate body, the cover plate body is sandwiched between the third limiting surface and the connecting block, and the main body has a fourth limiting surface facing the connecting block, the fourth limiting surface being connected to the connecting block.

7. The single-cell battery according to claim 1, characterized in that, The cover plate assembly further includes a sealing ring, which includes a first sealing section, a second sealing section and a third sealing section. The first sealing section is disposed between the cover plate body and the pole post, the second sealing section is disposed between the cover plate body and the connecting block, and the third sealing section is disposed between the pole post and the connecting block. The first sealing section connects the second sealing section and the third sealing section respectively.

8. The single-cell battery according to claim 7, characterized in that, The cover plate body has a groove on the side facing the connecting block, and the second sealing section is disposed in the groove.

9. The single-cell battery according to claim 1, characterized in that, The cover plate assembly also includes an upper plastic layer, which is disposed on the side of the cover plate body opposite to the electrode assembly, and the upper plastic layer connects the electrode post to the cover plate body.

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

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