电池单体、电池装置及用电装置
By designing a second connection and a thickened area in the flat region of the electrode assembly, the lever arm and stiffness are increased, solving the problems of deformation and cracking during battery expansion and improving the reliability and energy density of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-07-17
AI Technical Summary
During the expansion process, existing batteries are prone to cracking at the connection between the electrode assembly and the casing, which reduces battery reliability.
By designing a second connection in the flat area of the electrode assembly, which is further away from the flat area than the first connection, the lever arm is increased, the deformation of the electrode assembly during expansion is alleviated, and the stiffness is enhanced by thickening the area, reducing the risk of cracking of the connection.
It improves the reliability of individual battery cells, reduces the risk of casing deformation and cracking caused by electrode assembly expansion, and optimizes the energy density and manufacturing difficulty of the battery.
Smart Images
Figure CN224519973U_ABST
Abstract
Claims
1. A battery cell, characterized by, include: The outer casing includes an adjacent first wall and a second wall, wherein the second wall is connected to one end of the first wall along a first direction; An electrode assembly is housed within the housing. The electrode assembly has a flat region and includes a first electrode and a second electrode with opposite polarities. The portion of the first electrode located in the flat region and the portion of the second electrode located in the flat region are stacked along a second direction. A first wall is disposed on one side of the electrode assembly along the second direction, and the second direction is perpendicular to the first direction. The second wall includes a first portion and a second portion. Along the first direction, the first portion has a first inner surface facing the flat area, and the second portion has a second inner surface facing the flat area. The second inner surface is further away from the flat area than the first inner surface. The first portion is connected to the first wall to form a first connection portion, and the second portion is connected to the first wall to form a second connection portion. Along the first direction, the second connection portion is further away from the flat area than the first connection portion.
2. The battery cell of claim 1, wherein, The first wall includes a first region and a second region arranged along a third direction. Along the first direction, the end of the first region closest to the second wall is the first end. A portion of the second region extends beyond the first end. The first region and the first portion are connected to form the first connecting portion. The portion of the second region extending beyond the first end is connected to the second portion to form the second connecting portion. The first direction, the second direction, and the third direction are perpendicular to each other.
3. The battery cell of claim 2, wherein, Along the third direction, the first region is provided on both sides of the second region, and the first part is provided on both sides of the second part. Each first part is connected to a first region to form the first connecting part.
4. The battery cell of claim 2, wherein, Along the third direction, a second region is provided on both sides of the first region, and a second region is provided on both sides of the first part. Each second region is connected to another second region to form a second connecting part.
5. The battery cell of claim 2, wherein the cathode comprises a lithium metal oxide. The first region includes a first main body region and a first thickened region arranged along a first direction. The thickness of the first thickened region is greater than the thickness of the first main body region. Along the first direction, the first thickened region is located between the first main body region and the first connecting portion. The second region includes a second main body region and a second thickened region arranged along a first direction. The thickness of the second thickened region is greater than the thickness of the second main body region. Along the first direction, the second thickened region is located between the second main body region and the second connecting portion.
6. The battery cell of claim 5, wherein, Along the first direction, the width of the first thickened area is L1, 1mm≤L1≤10mm; and / or, along the first direction, the width of the second thickened area is L2, 1mm≤L2≤10mm.
7. The battery cell of claim 5, wherein the cathode comprises a lithium metal oxide. The thickness of the first thickened region is H1, where 0.05mm ≤ H1 ≤ 0.5mm; optionally, 0.1mm ≤ H1 ≤ 0.3mm; and / or, The thickness of the second thickened area is H2, where 0.05mm ≤ H2 ≤ 0.5mm; optionally, 0.1mm ≤ H2 ≤ 0.3mm.
8. The battery cell as described in claim 5, characterized in that, Along the first direction, the width of the first thickened area and the width of the second thickened area are equal; or, Along the first direction, the width of the first thickened area is smaller than the width of the second thickened area.
9. The battery cell of claim 5, wherein, The first main body region has a third inner surface facing the flat region, and the first thickened region protrudes from the third inner surface; And / or, the second main body region has a fourth inner surface facing the flat region, and the second thickened region protrudes from the fourth inner surface.
10. The battery cell of claim 9, wherein the cathode comprises a lithium metal oxide. The first main body region has a first outer surface that is opposite to the flat region, and the first thickened region has a second outer surface that is opposite to the flat region. The first outer surface and the second outer surface are flush. And / or, The second main body region has a third outer surface that is opposite to the flat region, and the second thickened region has a fourth outer surface that is opposite to the flat region. The third outer surface and the fourth outer surface are flush.
11. The battery cell of any one of claims 1-10, wherein, The battery cell further includes a first insulating member and a second insulating member. The first insulating member at least partially covers the outer periphery of the electrode assembly. The first insulating member includes a third region and a fourth region. Along the first direction, the end of the third region near the second wall is the second end, and a portion of the fourth region extends beyond the second end. The second insulating member is disposed on the surface of the second wall facing the flat area. The second insulating member includes a first insulating portion. At least a portion of the first connecting portion is connected to the second inner surface. The portion of the fourth area extending beyond the second end is thermally fused to the first insulating portion.
12. The battery cell of claim 11, wherein, The first wall further includes a third portion, which connects the first portion and the second portion; a portion of the first insulating portion is connected to the second inner surface, and another portion of the first insulating portion is connected to the inner surface of the third portion.
13. The battery cell as described in claim 12, characterized in that, The first insulating portion includes a first body and a first protrusion. The first body is connected to the second inner surface. The first protrusion protrudes from the surface of the first body away from the second inner surface. A portion of the first protrusion is connected to the first body. Another portion of the first protrusion is connected to the inner surface of the third portion. The portion of the fourth region extending beyond the second end is thermally fused to the first protrusion.
14. The battery cell of any one of claims 1-10, wherein, The first wall is the wall with the largest outer surface area in the outer shell.
15. The battery cell according to any one of claims 1-10, characterized in that, The housing includes two first walls along the second direction, with the two first walls located on both sides of the electrode assembly. A first recess is formed on the inner side of the second wall at a position corresponding to the second portion, and the first recess penetrates the second wall along the second direction.
16. The battery cell of claim 15, wherein, The electrode assembly includes a main body and a tab. The main body includes the flat region. The tab is connected to one end of the main body facing the second wall. At least a portion of the tab facing the first wall is accommodated in the first recess.
17. The battery cell of any one of claims 1-10, wherein, The first portion has a fifth outer surface, which is disposed opposite to the first inner surface. The second portion has a sixth outer surface, which is disposed opposite to the second inner surface. Along the first direction, the sixth outer surface is further away from the flat area than the fifth outer surface.
18. The battery cell of claim 17, wherein, Along the first direction, the second inner surface is further away from the flat area than the fifth outer surface.
19. The battery cell of any one of claims 1-10, wherein, A second recess is formed on the outer side of the second wall at a position corresponding to the first portion, and the second recess penetrates the second wall along the second direction.
20. The battery cell as described in claim 17, characterized in that, The battery cell also includes an electrode terminal, which is disposed in the first part and is electrically connected to the electrode assembly.
21. The battery cell as described in claim 20, characterized in that, Along a third direction, the first part is provided on both sides of the second part; The battery cell includes two electrode terminals, which are respectively disposed on two of the first portions, and the first direction, the second direction, and the third direction are perpendicular to each other.
22. The battery cell as described in claim 17, characterized in that, Along a third direction, the second part is provided on both sides of the first part; The battery cell also includes two electrode terminals, both of which are electrically connected to the electrode assembly. The two electrode terminals are disposed in the same first part, and the first direction, the second direction, and the third direction are perpendicular to each other.
23. The battery cell of any one of claims 1-10, wherein, The housing includes a shell and an end cap, the shell having an opening and the end cap sealing the opening; The end cap is the second wall, and at least one wall portion of the housing along the second direction is the first wall.
24. The battery cell of any one of claims 1-10, wherein, The first part is welded to the first wall to form a first connection part, and the second part is welded to the first wall to form a second connection part.
25. A battery device, characterized by Includes the battery cell as described in any one of claims 1-24.
26. The battery device of claim 25, wherein, The battery device also includes a housing, in which the individual battery cells are housed; Along the first direction, the surface of the second portion opposite to the second inner surface is further away from the electrode assembly than the surface of the first portion opposite to the first inner surface, and the battery device further includes a connecting portion connected to the second portion.
27. The battery device of claim 26, wherein, The connecting portion is connected to the surface of the second part that is opposite to the second inner surface.
28. The battery device of claim 26 or 27, wherein, The battery device further includes an adhesive layer, through which the connecting portion is connected to the second portion.
29. An electrical device, comprising: Includes a battery cell as described in any one of claims 1-24 or a battery device as described in any one of claims 25-28.