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CN-122025963-A - Battery device and electricity utilization device

CN122025963ACN 122025963 ACN122025963 ACN 122025963ACN-122025963-A

Abstract

The application discloses a battery device and an electricity utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer and a box body, wherein the box body is used for containing the battery monomer, the box body comprises a protection plate, the protection plate bears the battery monomer, the protection plate comprises a first fiber resin layer, a second fiber resin layer, a buffer layer and a reinforcing piece, the buffer layer and the reinforcing piece are all arranged between the first fiber resin layer and the second fiber resin layer, the buffer layer is provided with a first surface and a second surface which are opposite, the first surface is connected with the first fiber resin layer, and/or the second surface is connected with the second fiber resin layer. The battery device has high reliability.

Inventors

  • KE QINGPENG
  • WEI JIE
  • MIAO HUIMIN
  • PAN XIN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20241108

Claims (20)

  1. 1. A battery device, characterized by comprising: a battery cell; The battery pack comprises a case body, wherein the case body comprises a protection plate, the protection plate bears the battery cell, the protection plate comprises a first fiber resin layer, a second fiber resin layer, a buffer layer and a reinforcing piece, the buffer layer and the reinforcing piece are all arranged between the first fiber resin layer and the second fiber resin layer, the buffer layer is provided with a first surface and a second surface which are opposite, the first surface is connected with the first fiber resin layer, and/or the second surface is connected with the second fiber resin layer.
  2. 2. The battery device according to claim 1, wherein the battery device includes at least one cell assembly including a plurality of the cells stacked in a first direction, a surface of the cell perpendicular to the first direction being a surface of the cell having a largest area; The reinforcement extends in a second direction, the first direction and the second direction intersect, and the first direction and the second direction are perpendicular to the thickness direction of the protection plate.
  3. 3. The battery device according to claim 2, wherein the first direction, the second direction, and the thickness direction of the protection plate are perpendicular to each other.
  4. 4. The battery device according to claim 2, characterized in that the battery device further comprises: And the support piece is arranged between the battery unit and the protection plate and extends along the first direction.
  5. 5. The battery device of claim 4, wherein the support member has a cavity formed therein.
  6. 6. The battery device of claim 4 or 5, wherein the battery cell has two sides opposing in the second direction; The support pieces are respectively arranged at positions, corresponding to the side surfaces, on the protection plates, and in the same projection plane perpendicular to the thickness direction of the protection plates, the orthographic projections of the side surfaces of the same side of a plurality of battery cells in the battery cell assembly at least partially overlap with the orthographic projections of the same support pieces.
  7. 7. The battery device according to any one of claims 4 to 6, wherein a plurality of the battery cell assemblies are provided, the plurality of the battery cell assemblies being arranged in the second direction, and the orthographic projections of two adjacent battery cell assemblies at least partially overlap with the orthographic projections of the same support member in the same projection plane perpendicular to the thickness direction of the protection plate.
  8. 8. The battery device according to claim 4, wherein an orthographic projection of the support member intersects an orthographic projection of the reinforcement member in the same projection plane perpendicular to a thickness direction of the shield plate.
  9. 9. The battery device according to claim 8, wherein a plurality of the support members are provided, the plurality of support members being provided at intervals in the second direction, and the orthographic projection of the reinforcing member intersects with the orthographic projection of each of the support members in the same projection plane perpendicular to the thickness direction of the protection plate.
  10. 10. The battery device according to any one of claims 4 to 9, wherein the first fibrous resin layer is located on a side of the second fibrous resin layer facing the battery cell, the material of the support member is a fibrous resin material, and the support member is integrally formed with the first fibrous resin layer.
  11. 11. The battery device according to any one of claims 1 to 10, wherein a side of the battery cell facing the protection plate is provided with a pressure release mechanism.
  12. 12. The battery device according to any one of claims 1 to 11, wherein a plurality of the reinforcing members are provided, the plurality of reinforcing members being arranged at intervals in a first direction, each of the reinforcing members extending in a second direction, the first direction and the second direction intersecting each other, the first direction and the second direction being perpendicular to a thickness direction of the protection plate.
  13. 13. The battery device according to claim 12, wherein the buffer layer is provided between adjacent two of the reinforcing members.
  14. 14. The battery device according to any one of claims 1 to 13, wherein a cavity is formed inside the reinforcement.
  15. 15. The battery device according to any one of claims 1 to 13, wherein the reinforcing member extends in the second direction, the reinforcing member is made of a fibrous resin material, the reinforcing member includes a plurality of layers of first fibrous reinforcement prepregs stacked one on another, and the fibrous direction of each layer of the first fibrous reinforcement prepregs is parallel to the second direction.
  16. 16. The battery device according to any one of claims 1 to 15, wherein the protection plate further includes a reinforcing layer including a first connection portion connected to both the first fiber resin layer and the second fiber resin layer, the first connection portion being disposed around the buffer layer and the reinforcement.
  17. 17. The battery device according to claim 16, wherein the reinforcing layer further comprises a second connection portion connected to the first connection portion, and both sides of the second connection portion are connected to the second fibrous resin layer and the second surface, respectively.
  18. 18. The battery device according to claim 16, wherein the reinforcing layer further comprises a second connection portion connected to the first connection portion, and both sides of the second connection portion are connected to the first fibrous resin layer and the first surface, respectively.
  19. 19. The battery device of claim 16, wherein the first connection portion encloses a through hole, the buffer layer and the stiffener being located within the through hole.
  20. 20. The battery device of any one of claims 16-19, wherein the reinforcement layer comprises at least one of steel, titanium, ceramic, and high strength plastic.

Description

Battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery device and an electricity utilization 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. How to improve the reliability of the battery device is a problem to be solved in the battery technology. Disclosure of Invention In view of the above, the present application provides a battery device and an electric device, which can improve the reliability of the battery device. In a first aspect, the application provides a battery device comprising a battery cell and a case for containing the battery cell, the case comprising a protective plate carrying the battery cell, the protective plate comprising a first fibrous resin layer, a second fibrous resin layer, a buffer layer and a stiffener, the buffer layer and stiffener being disposed between the first fibrous resin layer and the second fibrous resin layer, the buffer layer having opposed first and second surfaces, the first surface being connected to the first fibrous resin layer and/or the second surface being connected to the second fibrous resin layer. In the technical scheme of the embodiment of the application, the first fiber resin layer and/or the second fiber resin layer can be tightly combined with the buffer layer to form a relatively stable integrated structure, so that the structural stability of the protection plate is improved. The reinforcing piece can improve the overall rigidity of the protection plate, and reduce the risk of excessive deformation of the protection plate after the protection plate is impacted by external force. The buffer layer can enable the protection plate to have certain capacity of collapsing and absorbing energy, so that the risk of excessive deformation caused by the fact that impact force is transmitted into the box body to cause the single battery to be stressed can be reduced. And further, the battery device has higher reliability. In one or more embodiments of the first aspect, the battery device includes at least one battery cell assembly including a plurality of battery cells stacked in a first direction, and a surface of the battery cell perpendicular to the first direction is a surface of the battery cell having a largest area. The reinforcement extends along a second direction, the first direction and the second direction intersect, and the first direction and the second direction are perpendicular to the thickness direction of the protection plate. In the above scheme, the extending direction of the reinforcing piece is intersected with the arrangement direction of a plurality of battery cells in the battery cell assembly, so that the risk of excessive deformation of the protection plate due to the force of a single direction can be reduced. In one or more embodiments of the first aspect, the first direction, the second direction, and the thickness direction of the shield plate are perpendicular to each other. In the above scheme, because the extending direction of the reinforcing piece is two-by-two perpendicular with the arrangement direction of a plurality of battery monomers in the battery monomer assembly and the thickness direction of the protection plate, in the assembly process, the reinforcing piece, the battery monomers and the protection plate can be mutually used as the reference, thereby simplifying the assembly difficulty of the battery device. In one or more embodiments of the first aspect, a support is disposed between the battery cell and the protection plate, the support extending in the first direction. In the scheme, the arrangement of the supporting piece can improve the assembly stability of the battery monomer. Meanwhile, in the external force transmission process, the supporting piece can also play a role in resisting deformation to a certain extent, so that the risk of excessive deformation of the battery cell is further reduced. In addition, the extending direction of the supporting piece is intersected with the extending direction of the reinforcing piece, so that the risk of excessive deformation of the battery cell when the protection plate is subjected to force in a single direction can be further reduced. In one or more embodiments of the first aspect, the support is internally formed with a cavity. In the scheme, because the support piece is internally provided with a space, the support piece also has certain ability of collapsing and absorbing energy, thereby further reducing the risk of excessive deformation of the battery monomer caused by external