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 which are connected, the cover plate assembly has a thickness direction, and the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction; the cover plate assembly comprises a cover plate body provided with an assembly hole in the thickness direction; the pole column is arranged in the assembly hole in a penetrating manner and is provided with a through first hole along the thickness direction; the sealing plate comprises a base part and a rib part which are connected, the base part covers the first hole and is connected with the pole, and the rib part is arranged on the side, facing the electrode assembly, of the base part and penetrates through the first hole; the electrode assembly comprises a first tab and a second tab, and the first tab and the second tab both extend into the first hole and are connected with the base part. The base part of the sealing plate is connected with the tab, so that a connecting sheet is omitted, the internal resistance of a product is reduced, welding procedures and parts are reduced, and the cost is reduced.

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, the cover plate assembly having a thickness direction, and the electrode assembly being 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 post is inserted through the mounting hole and has a through hole along the thickness direction;

[0008] A sealing plate includes a connected base and a rib, the base covering the first hole and connected to the electrode post, the rib being disposed on the side of the base facing the electrode assembly and passing through the first hole;

[0009] The electrode assembly includes a first tab and a second tab, both of which extend into the first hole and are respectively connected to the base.

[0010] In some embodiments, the first electrode tab and the second electrode tab are located on opposite sides of the rib and are bent and housed in the first hole.

[0011] In some embodiments, both the first electrode tab and the second electrode tab include a first connecting segment, a second connecting segment and a third connecting segment, the first connecting segment extending toward the rib, the second connecting segment connected to the base, and the third connecting segment connecting the first connecting segment and the second connecting segment respectively.

[0012] In some embodiments, the first electrode tab and the second electrode tab are arranged at intervals along a horizontal direction, and the horizontal direction intersects the thickness direction;

[0013] The first electrode and the second electrode further include a first bending portion and a second bending portion. The first bending portion connects the first connecting segment and the third connecting segment, and the second bending portion connects the second connecting segment and the third connecting segment. The third connecting segment is located between the first bending portion and the second bending portion.

[0014] In some embodiments, the first bend is located on the side of the first connecting segment facing the rib, and the second bend is located on the side of the second connecting segment away from the rib.

[0015] In some embodiments, there is a gap between the second connecting segment and the rib.

[0016] In some embodiments, the electrode assembly further includes an electrode body, and the first electrode tab and the second electrode tab further include lead-out ends, the lead-out ends being connected to the electrode body, and the orthographic projection of the lead-out ends on the plane perpendicular to the thickness direction is located within the first hole.

[0017] In some embodiments, the first electrode tab and the second electrode tab are arranged at intervals along a horizontal direction, and the horizontal direction intersects the thickness direction;

[0018] The lead-out end has a minimum distance G1 from the pole post along the horizontal direction, satisfying G1≥0.8mm.

[0019] In some embodiments, the first tab and the second tab have portions welded to the base, and the sealing plate has an open state detached from the pole post. In the open state, the portions of the sealing plate where the first tab and the second tab are welded to the base have a minimum dimension G2 along the thickness direction from the pole post, satisfying G2≥1.5mm.

[0020] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0021] Beneficial Effects: The single-cell battery of this application 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 passes through the assembly hole and is connected to the cover plate body. The electrode post has a through hole along the thickness direction. The sealing plate includes a connected base and a rib. The base covers the first hole and is connected to the electrode post. The rib is disposed on the side of the base facing the electrode assembly and passes through the first hole. The electrode assembly includes a first tab and a second tab. Both the first tab and the second tab extend into the first hole and are respectively connected to the base. By connecting the tabs through the base of the sealing plate, the connecting piece is eliminated, the internal resistance of the product is reduced, the welding process and components are reduced, and the cost is reduced.

[0022] 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

[0023] 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.

[0024] Figure 1 This is a three-dimensional structural diagram of a single battery cell in an embodiment of this application;

[0025] Figure 2 This is a top view of the structure of a single battery cell in an embodiment of this application;

[0026] 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;

[0027] Figure 4 for Figure 3 A structural diagram from a top-down view;

[0028] Figure 5 for Figure 2 Schematic cross-sectional view along the AA direction;

[0029] Figure 6 for Figure 5 A magnified view of a portion of point C in the middle;

[0030] Figure 7 for Figure 4 Cross-sectional view along the BB direction;

[0031] Figure 8 This is a three-dimensional structural diagram of the sealing plate in a single battery cell according to an embodiment of this application;

[0032] Reference numerals: 1. Cover plate assembly; 2. Electrode assembly; X, thickness direction; 11. Cover plate body; 12. Electrode post; 120. First hole; 13. Sealing plate; 131. Base; 132. Rib; 21. First electrode tab; 22. Second electrode tab; 211. First connecting section; 212. Second connecting section; 213. Third connecting section; Y, horizontal direction; 214. First bend; 215. Second bend; 2120. Gap; 23. Electrode body; 216. Lead-out end. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The single-cell battery of this application embodiment includes: 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, which has a receiving cavity and an opening. The cover plate assembly 1 is used to cover the opening and seal the electrode assembly 2 in the receiving cavity, thereby providing protection. At the same time, 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 an electrode body 23 connected together and a tab. The electrode body 23 is the part of the battery used to store charge, and the tab is used to connect the electrode body 23 to an external circuit.

[0039] Please see Figures 1 to 8 As shown, specifically, the cover plate assembly 1 includes: a cover plate body 11, a pole post 12, and a sealing plate 13; wherein, the cover plate body 11 has an assembly hole along the thickness direction X; the pole post 12 passes through the assembly hole and has a through first hole 120 along the thickness direction X; the sealing plate 13 includes a connected base 131 and a rib 132 (e.g., ...). Figure 8 As shown), the base 131 covers the first hole 120 and connects to the electrode post 12. A rib 132 is located on the side of the base 131 facing the electrode assembly 2 and passes through the first hole 120. The electrode assembly 2 includes a first tab 21 and a second tab 22, both extending into the first hole 120 and connected to the base 131 respectively (as shown). Figure 7 (As shown).

[0040] It should be understood 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 120 can communicate with the receiving cavity of the housing. The electrode tab of the electrode assembly 2 can pass through the first hole 120 and be directly connected to the sealing plate 13. The sealing plate 13 covers the first hole 120 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 the performance of the product. It is further understood that the first electrode 21 and the second electrode 22 are respectively connected to the base 131. During the assembly process, the first electrode 21 and the second electrode 22 are first inserted through the first hole 120 and extended outside the first hole 120. Then, the first electrode 21 and the second electrode 22 are respectively welded to the base 131. Finally, the sealing plate 13 and the pole post 12 are welded and assembled. The above assembly method is efficient and facilitates the welding of the electrode and the sealing plate 13. After welding, the electrode can be accommodated in the first hole 120, which improves the space utilization rate.

[0041] The aforementioned cover plate assembly 1 eliminates the connecting piece, reducing the internal resistance of the individual battery cells. It also reduces the number of welding processes and components, improving assembly efficiency, lowering costs, and enhancing product competitiveness. Simultaneously, the sealing plate 13 passes through the first groove and first hole 120 on the electrode post 12 and connects to the electrode post 12, achieving a seal between the sealing plate 13 and the electrode post 12, ensuring reliable sealing.

[0042] Please see Figures 5 to 6 As shown, in some embodiments, the first tab 21 and the second tab 22 are located on opposite sides of the rib 132 and are bent and accommodated within the first hole 120. It should be understood that the rib 132 can separate the first tab 21 and the second tab 22, preventing interference, deformation, or damage from mutual friction between them, thus improving protection. Simultaneously, increasing the distance between the first tab 21 and the second tab 22 prevents the welding quality of adjacent sides of the first tab 21 and the second tab 22 from being affected during the welding process between the tabs and the sealing plate 13. After the sealing plate 13 and the terminal post 12 are assembled, the first tab 21 and the second tab 22 can be accommodated within the first hole 120, improving space utilization and providing good protection for the first tab 21 and the second tab 22, preventing bending or damage during assembly, which would affect battery quality and lifespan.

[0043] Please see Figure 6 As shown, in some embodiments, both the first tab 21 and the second tab 22 include a first connecting segment 211, a second connecting segment 212, and a third connecting segment 213. The first connecting segment 211 extends toward the rib 132, the second connecting segment 212 is connected to the base 131, and the third connecting segment 213 connects the first connecting segment 211 and the second connecting segment 212 respectively. It should be understood that after the second connecting segment 212 is welded to the base 131, when the sealing plate 13 is assembled with the pole post 12, the portions of the first tab 21 and the second tab 22 located in the first hole 120 can be bent. The extending direction of the first connecting segment 211 extends toward the rib 132 to ensure that the first tab 21 and the second tab 22 are accommodated more within the first hole 120, further improving space utilization. On the other hand, it avoids the first tab 21 and the second tab 22 from being squeezed against the electrode assembly 2, ensuring the safety of the electrode assembly 2 and reducing the possibility of squeezing damage or breakage of different parts of the tab itself, thereby improving assembly quality and yield.

[0044] Please see Figure 6As shown, in some embodiments, the first tab 21 and the second tab 22 are arranged at intervals along the horizontal direction Y, which intersects the thickness direction X. The first tab 21 and the second tab 22 also include a first bending portion 214 and a second bending portion 215. The first bending portion 214 connects the first connecting segment 211 and the third connecting segment 213, and the second bending portion 215 connects the second connecting segment 212 and the third connecting segment 213. The third connecting segment is located between the first bending portion and the second bending portion. It should be understood that the arrangement of the first bending portion 214 and the second bending portion 215 can further improve the space utilization of the first hole 120 and ensure that the first connecting segment 211, the second connecting segment 212 and the third connecting segment 213 will not squeeze each other, thus ensuring the safety of the tab.

[0045] Please see Figure 6 As shown, in some embodiments, the first bend 214 is located on the side of the first connecting segment 211 facing the rib 132, and the second bend 215 is located on the side of the second connecting segment 212 away from the rib 132. It should be understood that the first bend 214 and the second bend 215 arrange the first electrode tab 21 and the second electrode tab 22 in an S-shaped structure, further improving space utilization and ensuring that the first connecting segment 211, the second connecting segment 212, and the third connecting segment 213 do not compress each other, thus ensuring the safety of the electrode tabs. It should be understood that the gap 2120 between the first bent portion 214 and the rib portion 132, and the gap 2120 between the second bent portion 215 and the electrode post 12, further ensure that the electrode tab will not come into stress contact with the electrode post 12, causing crushing damage. At the same time, it ensures that the electrode tab will not come into stress contact with the rib portion 132, causing crushing damage, and that the electrode tab will not extend toward the electrode body 23 after bending, and will not come into stress contact with the electrode body 23, thus ensuring the safety of the electrode body 23.

[0046] Please refer to Figures 1-2. In some embodiments, a gap 2120 is provided between the second connecting segment 212 and the rib 132. This is to prevent stress concentration at the contact point between the electrode tab and the rib 132 during the electrode tab bending process, which could lead to electrode tab damage.

[0047] Please refer to 6 and Figure 7As shown, in some embodiments, the electrode assembly 2 further includes an electrode body 23, and the first tab 21 and the second tab 22 further include leads connected to the electrode body 23. The orthographic projection of the leads on the plane perpendicular to the thickness direction X is located within the first hole 120. It should be understood that the leads are the retracted positions of the tabs after they are led out of the electrode body 23. The orthographic projection of the leads being located within the first hole 120 ensures that during the welding process between the tabs and the sealing plate 13, and during the welding and assembly process between the sealing plate 13 and the electrode post 12, the leads will not come into stress contact with the electrode post 12, thus ensuring that the electrode post 12 will not damage the leads of the first tab 21 and the second tab 22. Please refer to [link to relevant documentation]. Figure 6 As shown, in some embodiments, the first tab 21 and the second tab 22 are arranged at intervals along the horizontal direction Y, which intersects the thickness direction X; the lead-out end 216 has a minimum dimension G1 at a distance of ≥0.8mm from the terminal post 12 along the horizontal direction Y. The distance of the lead-out end 216 from the terminal post 12 is greater than or equal to 0.8mm to further improve the safety of the tabs, prevent damage to the tabs from the terminal post 12, avoid tab breakage, which would affect assembly quality and battery life.

[0048] Please see Figure 7 As shown, in some embodiments, the first tab 21 and the second tab 22 have portions welded to the base 131, and the sealing plate 13 has an open state detached from the pole post 12. In the open state, the portion of the sealing plate 13 where the first tab 21 and the second tab 22 are welded to the base 131 has a minimum dimension G2 along the thickness direction X from the pole post 12, satisfying G2 ≥ 1.5 mm. It should be understood that the open state means that the sealing plate 13 is separated from the pole post 12, and the portion of the first tab 21 and the second tab 22, except for the portion welded to the sealing plate 13, is straightened. At this time, the welding section (second connecting section 212) of the first tab 21 and the second tab 22 to the base 131 needs to be at least 1.5 mm away from the pole post 12 to ensure that there is sufficient space between the sealing plate 13 and the pole post 12 so that the welding equipment can weld the tabs to the sealing plate 13.

[0049] 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.

[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 characterized by, The application relates to a cover plate assembly (1) and an electrode assembly (2) connected to the cover plate assembly (1), wherein the electrode assembly (2) is arranged on one side of the cover plate assembly (1) in a thickness direction (X). The cover plate assembly (1) comprises: a cover plate body (11) provided with an assembly hole in the thickness direction (X); a pole column (12) penetrating through the assembly hole and provided with a first hole (120) penetrating through the pole column (12) in the thickness direction (X); a sealing plate (13) comprising a base (131) and a rib (132), wherein the base (131) covers the first hole (120) and is connected to the pole column (12), and the rib (132) is arranged on the side of the base (131) facing the electrode assembly (2) and penetrates through the first hole (120); the electrode assembly (2) comprises a first tab (21) and a second tab (22), wherein the first tab (21) and the second tab (22) both extend into the first hole (120) and are connected to the base (131) respectively. The first tab (21) and the second tab (22) are located on two sides of the rib (132) opposite to each other and are bent and accommodated in the first hole (120).

2. The cell according to claim 1, wherein The first tab (21) and the second tab (22) both comprise a first connecting section (211), a second connecting section (212) and a third connecting section (213), wherein the first connecting section (211) extends towards the rib (132), the second connecting section (212) is connected to the base (131), and the third connecting section (213) is connected to the first connecting section (211) and the second connecting section (212) respectively.

3. The cell according to claim 2, wherein The first tab (21) and the second tab (22) are arranged in a horizontal direction (Y) and are spaced apart from each other, wherein the horizontal direction (Y) intersects the thickness direction (X).

4. The cell according to claim 3, wherein The first tab (21) and the second tab (22) further comprise a first bending part (214) and a second bending part (215), wherein the first bending part (214) is connected to the first connecting section (211) and the third connecting section (213), the second bending part (215) is connected to the second connecting section (212) and the third connecting section (213), and the third connecting section (213) is located between the first bending part (214) and the second bending part (215). The first bending part (214) is located on the side of the first connecting section (211) facing the rib (132), and the second bending part (215) is located on the side of the second connecting section (212) away from the rib (132).

5. The cell according to claim 4, wherein The second connecting section (212) and the rib (132) have a gap (2120) therebetween.

6. The cell according to claim 3, wherein ​ 7. The cell according to claim 2, wherein The electrode assembly (2) further comprises an electrode body (23), the first tab (21) and the second tab (22) further comprise a lead-out end (216) connected to the electrode body (23), and a projection of the lead-out end (216) on a plane perpendicular to the thickness direction (X) is located in the first hole (120).

8. The cell according to claim 7, wherein The first tab (21) and the second tab (22) are arranged at intervals along a horizontal direction (Y) intersecting the thickness direction (X). The lead-out end (216) has a minimum size G1 along the horizontal direction (Y) from the pole column (12), and G1≥0.8mm is satisfied.

9. The cell of claim 1 wherein, The first tab (21) and the second tab (22) have a portion welded to the base (131), the sealing plate (13) has an open state separated from the pole column (12), and in the open state, the first tab (21) and the second tab (22) have a minimum size G2 along the thickness direction (X) from the pole column (12), and G2≥1.5mm is satisfied.

10. A battery pack, characterized by, A single battery comprising any one of claims 1 to 9. A single battery comprising any one of claims 1 to 9.

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