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. Each single battery comprises a cover plate assembly and an electrode assembly, the cover plate assembly has a first direction and a second direction which are intersected, and the electrode assembly is arranged on one side of the cover plate assembly along the first direction; 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, close to the electrode assembly, of the cover plate body and electrically connected with the electrode assembly, and a through hole is formed in the connecting block in the first direction; the pole penetrates through the assembly hole, is connected with the connecting block and seals the through hole; and the cover plate body is clamped between the connecting block and the pole. 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.

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 direction and second direction, and the electrode assembly being disposed on one side of the cover plate assembly along the first direction;

[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 near the electrode assembly and is electrically connected to the electrode assembly. The connecting block has a through hole along the first direction.

[0008] The pole is inserted through the assembly hole, and the pole is connected to the connecting block and seals the through hole;

[0009] The cover plate body is sandwiched between the connecting block and the pole post.

[0010] In some embodiments, the pole includes a main body and a first protrusion. The main body passes through the mounting hole and is connected to the first protrusion. The main body has a first limiting surface facing the connecting block. The first limiting surface is connected to the connecting block. The first protrusion is embedded in the through hole and connected to the inner wall of the through hole to seal the through hole.

[0011] In some embodiments, the portion of the first protrusion within the through hole has a first dimension W1mm along a first direction, satisfying W1≥0.15.

[0012] In some embodiments, the electrode post further includes a second protrusion disposed on the side of the cover plate body away from the electrode assembly and connected to the main body. The second protrusion has a second limiting surface facing the cover plate body, and the cover plate body is sandwiched between the second limiting surface and the connecting block.

[0013] 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 main body, the second sealing section is disposed between the cover plate body and the connecting block, and the third sealing section is disposed between the main body and the connecting block. The first sealing section connects the second sealing section and the third sealing section respectively.

[0014] 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.

[0015] In some embodiments, the sink has a third limiting surface facing the connecting block, the third limiting surface being flush with the first limiting surface in a second direction.

[0016] 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.

[0017] In some embodiments, the connecting block includes a body portion and a mating portion, which are connected. The body portion is located on the side of the cover plate body facing the electrode assembly, and the mating portion is located on the side of the body portion away from the electrode assembly. The mating portion is connected to the electrode post.

[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, and the electrode assembly is disposed on one side of the cover plate assembly along the first direction. The cover plate assembly includes: a cover plate body, a connecting block, and an electrode 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 near the electrode assembly and is electrically connected to the electrode assembly. The connecting block has a through hole along the first direction. The electrode post passes through the assembly hole and is connected to the connecting block, sealing the through hole. The cover plate body is sandwiched between the connecting block and the electrode post. This application reduces the number of assembly parts in the cover plate assembly by connecting the electrode post to the connecting block and sealing the through hole, thereby 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 for Figure 3 A magnified view of a portion of point B in the middle;

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

[0027] Figure 6 This is a cross-sectional schematic diagram of the pole in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10-Cover plate assembly; 11-Cover plate body; 111-Sinking groove; 1111-Third limiting surface; 12-Electrode post; 121-Main body; 1211-First limiting surface; 122-First protrusion; 123-Second protrusion; 1231-Second limiting surface; 124-First composite layer; 125-Second composite layer; 13-Connecting block; 131-Through hole; 132-Main body; 133-Matching part; 14-Sealing ring; 141-First sealing section; 142-Second sealing section; 143-Third sealing section; 15-Upper plastic; 20-Electrode assembly. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] It should also be noted that in the accompanying drawings of this application, an arrow marked X indicates the first direction, and an arrow marked Y indicates the second direction. The introduction of the first and second 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 first and second directions intersect. Optionally, the first and second 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. The first direction can be the thickness direction of the cover assembly, and the second direction can be the length direction of the cover assembly. The second direction can also be any direction on a plane perpendicular to the first direction.

[0033] As a preamble to the embodiments of this application, the cover plate assembly in the battery is mainly composed of electrode posts, cover plate body, connecting piece welding blocks, etc. Existing cover plate assemblies have many parts and occupy a lot of space, resulting in low space utilization. Furthermore, the electrode structure of the battery is generally riveted and then welded to the connecting piece. The traditional riveting scheme is subject to instantaneous impact force during riveting, which seriously affects the stability of the battery explosion-proof valve. In addition, the presence of the riveting block seriously occupies axial space, resulting in low space utilization.

[0034] 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.

[0035] 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 along the first direction X. It should be understood that the single-cell battery also includes a housing, which has 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.

[0036] Please see Figures 1 to 6 As 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 near the electrode assembly 20 and electrically connected to the electrode assembly 20, the connecting block 13 having a through hole 131 along the first direction X; an electrode post 12 passing through the assembly hole, the electrode post 12 being connected to the connecting block 13 and sealing the through hole 131; and the cover plate body 11 being sandwiched between the connecting block 13 and the electrode post 12.

[0037] It should be noted 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. The connecting block 13 can limit the lower side of the cover plate body 11, while the pole post 12 can limit the upper side of the cover plate 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, the connecting piece is eliminated, and the connecting piece and welding block are combined into one connecting block 13, reducing internal resistance, welding processes, and components, lowering costs, and improving product competitiveness. In addition, the motor assembly includes a tab, which is directly welded to the connecting block 13. By welding a busbar to the side of the tab away from the connecting block 13, the current inside the individual battery can be led out to the outside, shortening the current flow path, reducing battery internal resistance, and improving product performance.

[0038] Please see Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the pole post 12 includes a main body 121 and a first protrusion 122. The main body 121 passes through the mounting hole and is connected to the first protrusion 122. The main body 121 has a first limiting surface 1211 facing the connecting block 13. The first limiting surface 1211 is connected to the connecting block 13. The first protrusion 122 is embedded in the through hole 131 and connected to the inner wall of the through hole 131 to seal the through hole 131.

[0039] It should be noted that the connection between the first limiting surface 1211 and the connecting block 13 ensures a stable connection between the pole post 12 and the connecting block 13. The design of the first limiting surface 1211 provides mechanical support, allowing the connecting block 13 to be securely connected to the pole post 12. 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, thereby 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. In addition, 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] Please see Figure 4 As shown, in some embodiments, the portion of the first protrusion 122 within the through hole 131 has a first dimension W1mm along the first direction X, satisfying W1≥0.15. It should be noted that the first dimension W1mm within the through hole 131 can also satisfy 2.5≥W1≥0.15. The portion of the first protrusion 122 within the through hole 131 has a certain dimension along the first direction X, and the first protrusion 122 is 0.15mm to 2.5mm lower than the connecting block 13 within the through hole 131. This design aims to prevent solder from protruding onto the connecting block 13 and to ensure sufficient weld width between the sealing plate and the protrusion, guaranteeing connection strength and sealing. Furthermore, it makes the connection between the connecting block 13 and the pole post 12 more stable.

[0041] Please see Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the electrode post 12 further includes a second protrusion 123, disposed on the side of the cover plate body 11 opposite to the electrode assembly 20 and connected to the main body 121. The second protrusion 123 has a second limiting surface 1231 facing the cover plate body 11, and the cover plate body 11 is sandwiched between the second limiting surface 1231 and the connecting block 13. It should be noted that the cover plate body 11 being sandwiched between the second limiting surface 1231 and the connecting block 13 further ensures the clamping and fixing effect on the cover plate body 11.

[0042] Please see Figure 4 and Figure 5As 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 main body portion 121, 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 main body portion 121 and the connecting block 13. The first sealing section 141 connects the second sealing section 142 and the third sealing section 143 respectively.

[0043] It should be noted that 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 connecting block 13, and the third sealing section 143 is disposed between the main body 121 and the first limiting surface 1211; the sealing ring 14 is T-shaped, and the first sealing section 141 achieves the sealing between the cover plate body 11 and the main body 121, the second sealing section 142 achieves the sealing between the cover plate body 11 and the connecting block 13, and the third sealing section 143 achieves the sealing between the main body 121 and the connecting block 13.

[0044] Please see Figure 4 As 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 above and 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 first 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 first 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 131.

[0045] 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.

[0046] Please see Figure 4 and Figure 5As shown, in some embodiments, the recess 111 has a third limiting surface 1111 facing the connecting block 13, and the third limiting surface 1111 is flush with the first limiting surface 1211 in the second direction Y. It should be understood that the third limiting surface 1111 and the first limiting surface 1211 being flush in the second direction Y ensures that the third limiting surface 1111 and the first limiting surface 1211 are at the same height in 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 can 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.

[0047] Please see Figure 4 As shown, in some embodiments, the connecting block 13 includes a body portion 132 and a mating portion 133, which are connected. The body portion 132 is located on the side of the cover plate body 11 facing the electrode assembly 20, and the mating portion 133 is located on the side of the body portion 132 away from the electrode assembly 20. The mating portion 133 is connected to the electrode post 12. It can be understood that the cover plate body 11 is sandwiched between the body portion 132 and the electrode post 12. The connecting block 13 is stepped along the first direction X, meaning that along the first direction X, the mating portion 133 is higher than the body portion 132, thus forming a multi-layered stepped structure for the connecting block 13, achieving multiple connection relationships within a limited space. Through the design of different layers, space can be effectively utilized in the vertical direction, thereby reducing the overall component volume.

[0048] Please see Figure 6 As shown, 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 is closer to the connecting block 13 and can be made of copper, while the first composite layer 124 is farther from the connecting block 13 and can be made of 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.

[0049] 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.

[0050] 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.

[0051] 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; 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 near the electrode assembly and is electrically connected to the electrode assembly. The connecting block has a through hole along the first direction. A pole is inserted through the assembly hole, and the pole is connected to the connecting block and seals the through hole; The cover plate body is sandwiched between the connecting block and the pole post.

2. The single-cell battery according to claim 1, characterized in that, The pole includes a main body and a first protrusion. The main body passes through the assembly hole and is connected to the first protrusion. The main body has a first limiting surface facing the connecting block. The first limiting surface is connected to the connecting block. The first protrusion is embedded in the through hole and connected to the inner wall of the through hole to seal the through hole.

3. The single-cell battery according to claim 2, characterized in that, The portion of the first protrusion within the through hole has a first dimension W1mm along the first direction, satisfying W1≥0.

15.

4. The single-cell battery according to claim 2, characterized in that, The electrode post also includes a second protrusion, which is disposed on the side of the cover plate body away from the electrode assembly and connected to the main body. The second protrusion has a second limiting surface facing the cover plate body, and the cover plate body is sandwiched between the second limiting surface and the connecting block.

5. The single-cell battery according to claim 2, 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 main body, the second sealing section is disposed between the cover plate body and the connecting block, and the third sealing section is disposed between the main body and the connecting block. The first sealing section connects the second sealing section and the third sealing section respectively.

6. The single-cell battery according to claim 5, 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.

7. The single-cell battery according to claim 6, characterized in that, The settling tank has a third limiting surface facing the connecting block, and the third limiting surface is flush with the first limiting surface in the second direction.

8. 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.

9. The single-cell battery according to claim 1, characterized in that, The connecting block includes a body portion and a mating portion, the body portion and the mating portion are connected, the body portion is located on the side of the cover plate body facing the electrode assembly, the mating portion is located on the side of the body portion away from the electrode assembly, and the mating portion is connected to the pole post.

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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