Single battery and battery pack
By improving the structural design of the battery cover assembly and electrode assembly, the connecting piece was eliminated, enabling the electrode tabs to be directly connected to the sealing plate. This simplified the assembly process, reduced internal resistance and cost, and improved sealing reliability.
Patent Information
- Application Number
- CN202423303009.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing battery cover components have a large number of parts, complex assembly processes, and complex terminal post structures that cannot be processed in one go, resulting in high costs.
The new structural design of cover plate assembly and electrode assembly is adopted. The electrode post includes a main body, a first connecting part and a boss. The sealing plate passes through the first groove and the first hole and is sealed to the electrode post. The electrode ear is directly connected to the sealing plate, eliminating the connecting piece and simplifying the assembly process.
It reduces the internal resistance of individual cells, reduces welding processes and components, lowers costs, improves assembly efficiency, and ensures sealing reliability.
Smart Images
Figure CN223941885U_ABST
Abstract
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, connecting tabs, and sealing rings. However, using connecting tabs to connect the terminals results in a large number of parts and a complex assembly process. 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 the large number of parts and complex assembly process of the current cover plate assembly; 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 connected together, wherein the electrode assembly is disposed on one side of the cover plate assembly in the thickness direction;
[0005] The cover plate assembly includes:
[0006] The cover plate body has assembly holes along the thickness direction;
[0007] The pole includes a main body, a first connecting part, and a boss. The main body is inserted into the assembly hole. The main body has a through first hole along the thickness direction. The first connecting part is located on one side of the cover plate body along the thickness direction and is connected to the main body. The boss is located on the side of the first connecting part away from the cover plate body. The boss and the first connecting part form a first recess, which communicates with the first hole.
[0008] A sealing plate is provided with the first groove and the first hole passing through it along the thickness direction, and is sealed to the pole post.
[0009] The electrode assembly includes a tab that passes through the first hole and is connected to the sealing plate.
[0010] In some embodiments, the sealing plate has a first wall facing the boss, the boss has a second wall, the second wall being disposed opposite to the first wall;
[0011] The cover plate assembly further includes a first welding part, which connects the first wall and the second wall respectively;
[0012] Along the thickness direction, the first welded portion has a first dimension W mm, satisfying W≥0.8.
[0013] In some embodiments, the sealing plate has a first portion protruding out of the first sink along the thickness direction, the first portion having a second dimension C mm along the thickness direction, satisfying C≥0.15.
[0014] In some embodiments, the sealing plate includes a connected base and a protrusion. The base passes through the first recess and extends into the first hole. The protrusion is disposed on the side of the base facing the protrusion and is received in the first recess. Along the thickness direction, the protrusion has a third dimension T1 mm, satisfying T1≥0.8. The base has a fourth dimension T2 mm, satisfying T2≥2.
[0015] In some embodiments, the base and the main body have a gap dimension G mm, satisfying G≤0.1.
[0016] In some embodiments, the electrode assembly includes a first electrode tab and a second electrode tab, the first electrode tab and the second electrode tab extending and being received within the first hole;
[0017] The sealing plate further includes a rib, which is disposed on the side of the sealing plate facing the electrode assembly and passes through the first hole;
[0018] The first electrode and the second electrode are located on opposite sides of the rib.
[0019] In some embodiments, the first electrode tab and the second electrode tab are arranged in a horizontal direction, which intersects the thickness direction, and the rib has a fifth dimension T3 mm in the horizontal direction, satisfying T3≥0.8.
[0020] In some embodiments, the rib has a second portion protruding out of the first hole along the thickness direction, the second portion having a sixth dimension H mm along the thickness direction, satisfying H≥0.5.
[0021] In some embodiments, the orthographic projections of the first tab and the second tab on a plane perpendicular to the thickness direction are both located within the first hole.
[0022] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.
[0023] Beneficial effects: The single battery in this embodiment includes a connected 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 sealing plate. 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 boss. The main body is inserted into the assembly hole and has a through first hole along the thickness direction. The first connecting part is located on one side of the cover plate body along the thickness direction and is connected to the main body. The boss is disposed on the side of the first connecting part away from the cover plate body. The boss and the first connecting part form a first recess, which communicates with the first hole. The sealing plate is inserted into the first recess and the first hole along the thickness direction and is sealed to the electrode post. The electrode assembly includes an electrode tab, which is inserted into the first hole and connected to the sealing plate. The tabs are directly connected to the sealing plate, eliminating the need for connecting pieces, reducing the internal resistance of individual cells, reducing welding processes and components, lowering costs, and improving assembly efficiency; at the same time, the sealing plate passes through the first groove and the first hole opened on the electrode post and is sealed to the electrode post, ensuring reliable sealing.
[0024] 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
[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a three-dimensional structural diagram of a single battery cell according to an embodiment of this application;
[0027] Figure 2 This is a top view of the structure of a single battery cell according to an embodiment of this application;
[0028] Figure 3 This is a schematic diagram of the assembly of the sealing plate and the electrode post in a single cell of an embodiment of this application;
[0029] Figure 4 for Figure 3 A structural diagram from a top-down view;
[0030] Figure 5 for Figure 2 Schematic cross-sectional view along the AA direction;
[0031] Figure 6 for Figure 5 A magnified view of a portion of point C in the middle;
[0032] Figure 7 for Figure 4 Cross-sectional view along the BB direction;
[0033] Figure 8 for Figure 7 A magnified view of a portion of point D in the middle;
[0034] Figure 9 for Figure 7 Cross-sectional view of the central pole;
[0035] Figure 10 This is a three-dimensional structural diagram of the sealing plate in a single battery cell according to an embodiment of this application;
[0036] Reference numerals: 1. Cover plate assembly; X, thickness direction; 11. Cover plate body; 12. Electrode post; 121. Main body; 122. First connecting part; 123. Boss; 1210. First hole; 124. First recess; 13. Sealing plate; 2. Electrode assembly; 131. First wall; 1231. Second wall; 14. First welding part; 132. First section; 133. Base; 134. Protrusion; 21. First electrode tab; 22. Second electrode tab; 135. Rib; Y, horizontal direction; 1351. Second section. Detailed Implementation
[0037] 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.
[0038] 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.
[0039] 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 horizontal direction. The introduction of the thickness and horizontal 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 horizontal directions intersect. Optionally, the thickness and horizontal 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.
[0040] As a preamble to the embodiments of this application, the cover assembly in the battery mainly consists of an electrode post, a cover body, a connecting piece, and a sealing ring. However, the electrode tabs of the electrode assembly and the electrode post of the cover assembly need to be connected by a connecting piece, resulting in a large number of parts and a complex assembly process; at the same time, the electrode post itself has a complex structure and cannot be machined in one go, requiring secondary processing, which increases costs.
[0041] 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.
[0042] 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.
[0043] An embodiment of this application provides a single-cell battery, comprising: a cover plate assembly 1 and an electrode assembly 2 connected together. The cover plate assembly 1 has a thickness direction X, and the electrode assembly 2 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 2 within the receiving cavity, providing protection. Simultaneously, the cover plate assembly 1 is also used to allow the current of the electrode assembly 2 inside the housing to be led out to the outside of the housing. The electrode assembly 2 includes a connected electrode body and a tab. The electrode body is the part of the battery used to store charge, and the tab is used to connect the electrode body to an external circuit.
[0044] Please see Figures 1 to 9As shown, specifically, the cover plate assembly 1 includes: a cover plate body 11, an electrode post 12, and a sealing plate 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 boss 123, the main body 121 is inserted into the assembly hole, the main body 121 has a through first hole 1210 along the thickness direction X, the first connecting part 122 is located on one side of the cover plate body 11 along the thickness direction X and is connected to the main body 121, the boss 123 is disposed on the side of the first connecting part 122 away from the cover plate body 11, the boss 123 and the first connecting part 122 form a first recess 124, the first recess 124 is connected to the first hole 1210; the sealing plate 13 is inserted through the first recess 124 and the first hole 1210 along the thickness direction X and is sealed to the electrode post 12; the electrode assembly 2 includes an electrode tab, the electrode tab is inserted into the first hole 1210 and connected to the sealing plate 13.
[0045] It is important to understand that the electrode post 12 of this application has a through-hole structure, which can be processed in one step, resulting in low processing costs and reduced product weight. The first hole 1210 can communicate with the receiving cavity of the housing. The electrode tab of the electrode assembly 2 can pass through the first hole 1210 and be directly connected to the sealing plate 13. The sealing plate 13 covers the first hole 1210 and connects to the electrode post 12, achieving a seal between the sealing plate 13 and the electrode post 12, ensuring the environmental safety of the electrode assembly 2. By welding a busbar to the side of the sealing plate 13 away from the electrode tab, the current inside the single cell can be led out to the outside, shortening the current flow path, reducing the internal resistance of the battery, and improving product performance. The above-mentioned cover plate assembly 1 structure eliminates the connecting piece, reduces the internal resistance of the single cell, and reduces the number of welding processes and parts, thereby improving assembly efficiency, reducing costs, and enhancing product competitiveness. Meanwhile, the sealing plate 13 passes through the first recess 124 and the first hole 1210 opened on the pole post 12 and is connected to the pole post 12, realizing the seal between the sealing plate 13 and the pole post 12 and ensuring the reliability of the seal. It should be further understood that the boss 123 mainly serves to limit the sealing plate 13 in the direction perpendicular to the thickness X; the first recess 124 and the first hole 1210 serve to accommodate the sealing plate 13. At the same time, the first recess 124 and the first hole 1210 are connected, and the inner diameter of the first recess 124 is larger than the inner diameter of the first hole 1210, so that the contact surface between the first recess 124 and the first hole 1210 forms an assembly step for supporting the sealing plate 13; this assembly structure has high stability and facilitates the sealing welding of the sealing plate 13 and the pole post 12, ensuring the reliability of the seal.
[0046] Please see Figures 5 to 6As shown, in some embodiments, the sealing plate 13 has a first wall 131 facing the boss 123, the boss 123 has a second wall 1231, the second wall 1231 is disposed opposite to the first wall 131; the cover plate assembly 1 also includes a first welding part 14, the first welding part 14 connects the first wall 131 and the second wall 1231 respectively; along the thickness direction X, the first welding part 14 has a first dimension W mm, satisfying W≥0.8.
[0047] It should be understood that the first wall 131 and the second wall 1231 are welded together by the first welding part 14, so that the sealing plate 13 and the boss 123 are sealed together to ensure the sealing performance of the pole post 12. The first dimension W is greater than or equal to 0.8 mm to ensure that the weld between the sealing plate 13 and the boss 123 has sufficient weld width to ensure connection strength and sealing performance.
[0048] Please see Figures 5 to 6 As shown, in some embodiments, the sealing plate 13 has a first portion 132 protruding out of the first recess 124 along the thickness direction X. The first portion 132 has a second dimension C mm along the thickness direction X, satisfying C ≥ 0.15. It should be understood that the protruding first portion 132 ensures that the welding position of the first wall 131 and the second wall 1231 is located below the first portion 132, and the second dimension C is greater than or equal to 0.15 mm, to prevent the weld point formed by the welding of the first wall 131 and the second wall 1231 from protruding from the top of the sealing plate 13, thus avoiding affecting the welding of the top of the sealing plate 13 to the busbar.
[0049] Please see Figures 5 to 6 As shown, in some embodiments, the sealing plate 13 includes a connected base 133 and a protrusion 134. The base 133 penetrates the first recess 124 and extends into the first hole 1210. The protrusion 134 is disposed on the side of the base 133 facing the protrusion 123 and is received within the first recess 124. Along the thickness direction X, the protrusion 134 has a third dimension T1 mm, satisfying T1≥0.8, and the base 133 has a fourth dimension T2 mm, satisfying T2≥2. It should be understood that the sealing plate 13 has a T-shaped structure to form an assembly step with the contact surface of the first recess 124 and the first hole 1210. This fitting method has high stability and facilitates the sealing welding of the sealing plate 13 and the pole post 12. The size of the protrusion 134 is greater than or equal to 0.8 mm, ensuring sealing reliability and the strength of the sealing plate 13 after welding.
[0050] Please continue reading. Figure 6As shown, in some embodiments, there is a gap size Gmm between the base 133 and the main body 121, satisfying G≤0.1. The gap between the base 133 and the main body 121 ensures the welding strength between the sealing plate 13 and the busbar, preventing laser penetration of the sealing plate 13 and affecting product performance. Simultaneously, the gap size G is less than or equal to 0.1mm to ensure the assembly stability of the sealing plate 13, avoiding instability of the sealing plate 13's center of gravity, which would affect the connection strength and reliability between the sealing plate 13 and the pole post 12 after welding.
[0051] Please see Figure 5 , Figure 6 and Figure 10 As shown, in some embodiments, the electrode assembly 2 includes a first tab 21 and a second tab 22, which extend and are received within a first hole 1210. The sealing plate 13 also includes a rib 135, which is disposed on the side of the sealing plate 13 facing the electrode assembly 2 and penetrates through the first hole 1210. The first tab 21 and the second tab 22 are located on opposite sides of the rib 135. It should be understood that the first tab 21 and the second tab 22 can be received within the first hole 1210, improving space utilization and providing better protection for the first tab 21 and the second tab 22, preventing bending or crushing damage during assembly, which would affect battery quality and lifespan. Specifically, the rib 135 can separate the first tab 21 and the second tab 22, preventing interference, deformation, or friction damage between them, thus improving protection.
[0052] Please see Figure 6 As shown, in some embodiments, the first electrode tab 21 and the second electrode tab 22 are arranged along the horizontal direction Y, which intersects the thickness direction X. The rib 135 has a fifth dimension T3 mm in the horizontal direction Y, satisfying T3≥0.8. The fifth dimension T3 is greater than or equal to 0.8 mm, which can further prevent the first electrode tab 21, the second electrode tab 22 from affecting each other when welding with the sealing plate 13.
[0053] Please see Figure 6 As shown, in some embodiments, the rib 135 has a second portion protruding out of the first hole 1210 along the thickness direction X. The second portion has a sixth dimension H mm along the thickness direction X, satisfying H≥0.5. The sixth dimension H is greater than or equal to 0.5 mm, which can prevent the first electrode tab 21 and the second electrode tab 22 from overlapping or shaking in the first hole 1210 after the sealing plate 13 and the electrode post 12 are welded, causing the first electrode tab 21 and the second electrode tab 22 to rub against each other and generate metal shavings, affecting the battery quality and service life.
[0054] Please see Figures 5 to 8As shown, in some embodiments, the orthographic projections of the first tab 21 and the second tab 22 on the plane perpendicular to the thickness direction X are both located within the first hole 1210. This reduces the possibility of interference between the end of the first tab 21 and the second tab 22 connected to the electrode body and the electrode post 12, further ensuring the assembly quality of the first tab 21 and the second tab 22, preventing the first tab 21 and the second tab 22 from being squeezed and broken by the electrode post 12, and ensuring the assembly quality and safety of the single cell.
[0055] This application sets the mating parameters of the terminal post 12 and the sealing plate 13, as well as the parameters of the sealing plate 13, to ensure the reliability of the welding between the sealing plate 13 and the terminal post 12 and improve the battery performance. In the above embodiments, the descriptions of each embodiment have different focuses; parts not described in detail in a certain embodiment can be referred to the relevant descriptions of other embodiments.
[0056] This application also discloses a battery pack, including the single battery cell 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.
[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 connected cover plate assembly (1) and an electrode assembly (2), wherein the electrode assembly (2) is disposed on one side of the cover plate assembly (1) in the thickness direction (X); The cover plate assembly (1) includes: The cover plate body (11) has mounting holes along the thickness direction (X); The pole post (12) includes a main body (121), a first connecting part (122), and a boss (123). The main body (121) is inserted into the assembly hole. The main body (121) has a through first hole (1210) along the thickness direction (X). The first connecting part (122) is located on one side of the cover plate body (11) along the thickness direction (X) and is connected to the main body (121). The boss (123) is located on the side of the first connecting part (122) away from the cover plate body (11). The boss (123) and the first connecting part (122) form a first recess (124). The first recess (124) communicates with the first hole (1210). The sealing plate (13) passes through the first recess (124) and the first hole (1210) along the thickness direction (X) and is sealed to the pole post (12); The electrode assembly (2) includes a tab that passes through the first hole (1210) and is connected to the sealing plate (13).
2. The single-cell battery according to claim 1, characterized in that, The sealing plate (13) has a first wall (131) facing the boss (123), the boss (123) has a second wall (1231), and the second wall (1231) is disposed opposite to the first wall (131); The cover plate assembly (1) further includes a first welding part (14), which connects the first wall (131) and the second wall (1231) respectively; Along the thickness direction (X), the first welded portion (14) has a first dimension W mm, satisfying W≥0.
8.
3. The single-cell battery according to claim 1, characterized in that, The sealing plate (13) has a first portion (132) protruding out of the first sink (124) along the thickness direction (X), and the first portion (132) has a second dimension C mm along the thickness direction (X) such that C ≥ 0.
15.
4. The single-cell battery according to claim 1, characterized in that, The sealing plate (13) includes a connected base (133) and a protrusion (134). The base (133) passes through the first recess (124) and extends into the first hole (1210). The protrusion (134) is disposed on the side of the base (133) facing the protrusion (123) and is received in the first recess (124). Along the thickness direction (X), the protrusion (134) has a third dimension T1 mm, satisfying T1≥0.
8. The base (133) has a fourth dimension T2 mm, satisfying T2≥2.
5. The single-cell battery according to claim 4, characterized in that, The base (133) and the main body (121) have a gap dimension G mm, which satisfies G≤0.
1.
6. The single-cell battery according to claim 1, characterized in that, The electrode assembly (2) includes a first electrode tab (21) and a second electrode tab (22), which extend and are received within the first hole (1210); The sealing plate (13) further includes a rib (135), which is disposed on the side of the sealing plate (13) facing the electrode assembly (2) and passes through the first hole (1210); The first electrode (21) and the second electrode (22) are located on opposite sides of the rib (135).
7. The single-cell battery according to claim 6, characterized in that, The first electrode tab (21) and the second electrode tab (22) are arranged along the horizontal direction (Y), which intersects the thickness direction (X). The rib (135) has a fifth dimension T3 mm in the horizontal direction (Y), satisfying T3≥0.
8.
8. The single-cell battery according to claim 6, characterized in that, The rib (135) has a second part (1351) protruding out of the first hole (1210) along the thickness direction (X), and the second part (1351) has a sixth dimension H mm along the thickness direction (X) to satisfy H≥0.
5.
9. The single-cell battery according to claim 6, characterized in that, The orthographic projections of the first tab (21) and the second tab (22) on the plane perpendicular to the thickness direction (X) are both located within the first hole (1210).
10. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 9.