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CN-122000556-A - Battery cell, battery device and electricity utilization device

CN122000556ACN 122000556 ACN122000556 ACN 122000556ACN-122000556-A

Abstract

The application provides a battery cell, a battery device and an electricity utilization device. The battery cell includes a case and an electrode assembly. The housing includes a first wall portion. An electrode assembly is contained within the housing, the electrode assembly including a first electrode sheet, a solid electrolyte layer, and a second electrode sheet, at least a portion of the first electrode sheet, at least a portion of the solid electrolyte layer, and at least a portion of the second electrode sheet being stacked along a first direction. Wherein, along the first direction, a position of the first wall part opposite to the electrode assembly is provided with a concave part, and the concave part is configured to provide expansion space for the electrode assembly. The concave part can be deformed to the outside of the battery cell under the expansion action of the electrode assembly, when other components are arranged at the position of the concave part opposite to the electrode assembly, the concave part can provide a deformation space for the first wall part, so that the influence of the expansion of the electrode assembly on the outside component is reduced, the risk that the battery cell or the outside component is damaged under the action of the expansion force is reduced, and the reliability of the battery cell is improved.

Inventors

  • WU KAI
  • WU YANLAN
  • YANG LEI
  • WU YICHEN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (20)

  1. 1. A battery cell, comprising: A housing including a first wall portion; An electrode assembly housed within the housing, the electrode assembly including a first pole piece, a solid electrolyte layer, and a second pole piece, the first pole piece and the second pole piece being opposite in polarity, the solid electrolyte layer being disposed between the first pole piece and the second pole piece, at least a portion of the first pole piece, at least a portion of the solid electrolyte layer, and at least a portion of the second pole piece being stacked along a first direction along which a large face of the electrode assembly is disposed opposite the first wall portion; Wherein, along the first direction, a recess is provided at a position of the first wall portion opposite to the electrode assembly, the recess being configured to provide an expansion space for the electrode assembly.
  2. 2. The battery cell of claim 1, wherein the recess is provided in a side of the first wall portion facing away from the electrode assembly in the first direction.
  3. 3. The battery cell of claim 2, wherein the first wall portion has a first outer surface facing away from the electrode assembly in the first direction, the recess being a groove disposed in the first outer surface, the groove extending to at least one end of the first wall portion in a second direction, the second direction being perpendicular to the first direction.
  4. 4. The battery cell of claim 3, wherein opposite ends of the recess extend to opposite ends of the first wall portion in the second direction.
  5. 5. The battery cell of claim 3, further comprising an electrode terminal, wherein the electrode terminal is disposed at least one end of the housing in a third direction, and wherein the first direction, the second direction, and the third direction are perpendicular to each other.
  6. 6. The battery cell of claim 3, wherein the groove has a maximum dimension L 1 and the housing has a maximum dimension L 2 ,0.9≤L 1 /L 2 +.0.98 in a third direction, the first direction, the second direction, and the third direction being perpendicular to each other.
  7. 7. The battery cell of claim 6, wherein 90mm +.l 2 +.180 mm.
  8. 8. The battery cell of claim 6, wherein the housing has opposing second and third outer surfaces in the third direction, the groove has a minimum distance L 3 from the second outer surface, the groove has a minimum distance L 4 ;0.01≤L 3 /L 2 ≤0.05 from the third outer surface, and/or 0.01≤L 4 /L 2 ≤0.05.
  9. 9. The battery cell of claim 8, wherein L 3 ＝L 4 .
  10. 10. The battery cell of claim 2, wherein the recess has a maximum dimension H 1 and the electrode assembly has a minimum dimension H 2 ,0.01≤H 1 /H 2 ∈0.15 in the first direction.
  11. 11. The battery cell according to claim 2, wherein a convex portion is provided at a position corresponding to the concave portion on a side of the first wall portion facing the electrode assembly in the first direction.
  12. 12. The battery cell of any one of claims 1-11, wherein a maximum dimension of the housing in the first direction is W 1 ,25mm≤W 1 ∈75mm.
  13. 13. The battery cell of any one of claims 1-11, wherein the housing comprises two of the first wall portions disposed opposite each other in the first direction, the electrode assembly being located between the two first wall portions.
  14. 14. The battery cell of any one of claims 1-11, wherein the length of the housing and the height of the housing are both greater than the width of the housing, the width direction of the housing being parallel to the first direction.
  15. 15. The battery cell of any one of claims 1-11, wherein the housing comprises: a housing having an opening; An end cap closing the opening; The housing includes the first wall portion.
  16. 16. The battery cell of claim 15, wherein the housing includes two first wall portions disposed opposite each other in the first direction and two second wall portions disposed opposite each other in the second direction, the housing having the opening at least one end in a third direction, the first direction, the second direction, and the third direction being perpendicular to each other; the largest dimension of the first wall portion in the second direction is larger than the largest dimension of the second wall portion in the first direction.
  17. 17. The battery cell of any one of claims 1-11, wherein the electrode assembly is a laminate structure.
  18. 18. A battery device comprising a plurality of the battery cells of any one of claims 1-17, the plurality of battery cells being arranged along the first direction.
  19. 19. The battery device of claim 18, wherein a side of the first wall portion facing away from the electrode assembly is provided with the recess in the first direction; the battery device further comprises a buffer member, wherein the buffer member is arranged between two adjacent battery cells along the first direction, and at least part of the buffer member is accommodated in the concave part.
  20. 20. The battery device of claim 19, wherein in two adjacent battery cells, a portion of the buffer is received in the recess of the first wall portion of one of the battery cells and another portion of the buffer is received in the recess of the first wall portion of the other of the battery cells.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electric device. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. The battery device is widely applied to the fields of portable electronic equipment, electric vehicles, electric tools, unmanned aerial vehicles, energy storage equipment and the like. In addition to considering the performance of the battery cell, the reliability of the battery cell is also a non-negligible problem. Therefore, how to improve the reliability of the battery cell is a technical problem to be solved in the battery technology. Disclosure of Invention The embodiment of the application provides a battery cell, a battery device and an electricity utilization device, which can improve the reliability of the battery cell. In a first aspect, embodiments of the present application provide a battery cell including a housing and an electrode assembly. The housing includes a first wall portion. The electrode assembly is accommodated in the shell and comprises a first pole piece, a solid electrolyte layer and a second pole piece, the polarities of the first pole piece and the second pole piece are opposite, the solid electrolyte layer is arranged between the first pole piece and the second pole piece, at least one part of the first pole piece, at least one part of the solid electrolyte layer and at least one part of the second pole piece are arranged in a stacked mode along a first direction, and the large surface of the electrode assembly is opposite to the first wall portion along the first direction. Wherein, along the first direction, a position of the first wall part opposite to the electrode assembly is provided with a concave part, and the concave part is configured to provide expansion space for the electrode assembly. In the above technical solution, since the first direction is set parallel to the thickness direction of the first wall portion, and at least a portion of the first electrode sheet, at least a portion of the solid electrolyte layer, and at least a portion of the second electrode sheet are stacked along the first direction, the expansion force of the electrode assembly expanding along the first direction is greater. By providing the recess at the position where the first wall portion is opposite to the electrode assembly, the recess can provide an expansion space for the electrode assembly, reducing the internal stress of the battery cell. When one side of the first wall part, which is away from the electrode assembly, is provided with other parts, the electrode assembly is expanded to easily extrude the other parts, the concave part can provide expansion space for the electrode assembly, so that the internal stress of the battery cell is reduced when the expansion force of the electrode assembly extrudes the other parts, the risk that the battery cell is damaged under the action of the expansion force is reduced, and the reliability of the battery cell is improved. In some embodiments, a side of the first wall portion facing away from the electrode assembly is provided with a recess in the first direction. In this way, when the electrode assembly expands to press the first wall portion, the concave portion can expand outward to provide a deformation space for the first wall portion, reducing the internal stress of the battery cell. In some embodiments, the first wall portion has a first outer surface facing away from the electrode assembly in a first direction, the recess is a groove disposed in the first outer surface, the groove extends to at least one end of the first wall portion in a second direction, the second direction being perpendicular to the first direction. Through setting up the concave part for setting up in the recess of first surface, and the recess extends to at least one end of first wall portion along the second direction, on the one hand, is favorable to the battery monomer to extend to the tip heat dissipation of first wall portion through the recess, on the other hand for the processing of concave part is more convenient, has reduced the processing cost of concave part. In some embodiments, in the second direction, opposite ends of the groove extend to opposite ends of the first wall portion, respectively. Therefore, on one hand, the battery monomer can dissipate heat through two opposite ends of the groove, on the other hand, the processing of the first wall part is more convenient, the molding difficulty of the first wall par