CN-224204235-U - Battery device and electricity utilization device

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 box body, a battery monomer and a protection plate. The protection plate comprises a first area and a second area, wherein in the first area, a first fiber resin layer, a reinforcing layer and a second fiber resin layer are sequentially stacked, and the first fiber resin layer is positioned on one side of the reinforcing layer, which faces the battery cell. In the second area, the first fiber resin layer, the second fiber resin layer and the reinforcing layer are sequentially stacked, or the reinforcing layer, the first fiber resin layer and the second fiber resin layer are sequentially stacked, or the first fiber resin layer, the reinforcing layer and the second fiber resin layer are sequentially stacked, wherein the reinforcing layer comprises a plurality of layers of mutually stacked fiber prepreg unidirectional tapes, fibers in each layer of fiber prepreg unidirectional tapes are unidirectionally arranged, and the fiber arrangement directions in each layer of fiber prepreg unidirectional tapes are the same. The battery device has high reliability.

Inventors

• WEI JIE
• KE QINGPENG
• PAN XIN

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260505

Application Date

20250326

Priority Date

20241030

Claims (16)

1. 1. A battery device, characterized by comprising: A case; the battery monomer is arranged in the box body; The protection plate is arranged at the bottom of the battery monomer along the gravity direction and comprises a first fiber resin layer, a reinforcing layer, a second fiber resin layer and a reinforcing layer, and the protection plate comprises a first area and a second area; in the first region, the first fiber resin layer, the reinforcing layer and the second fiber resin layer are sequentially stacked, and the first fiber resin layer is positioned on one side of the reinforcing layer facing the battery cell; In the second region, the first fiber resin layer, the second fiber resin layer and the reinforcing layer are sequentially laminated, or the reinforcing layer, the first fiber resin layer and the second fiber resin layer are sequentially laminated; The reinforcing layer comprises a plurality of layers of fiber prepreg unidirectional tapes which are mutually laminated, wherein the fibers in each layer of fiber prepreg unidirectional tape are unidirectionally arranged, and the fiber arrangement directions in each layer of fiber prepreg unidirectional tape are the same.
2. 2. The battery device according to claim 1, wherein the reinforcing layer is a fiber resin frame, the fiber resin frame is arranged around the reinforcing layer, the fiber resin frame comprises a plurality of frame sections connected end to end, each frame section comprises a plurality of layers of sub-fiber prepreg unidirectional tapes stacked with each other, the fibers in each layer of sub-fiber prepreg unidirectional tapes are unidirectionally arranged, and the fiber arrangement directions in each layer of sub-fiber prepreg unidirectional tapes are the same.
3. 3. The battery device of claim 2, wherein fibers in the fibrous prepreg unidirectional tape in adjacent two frame segments are broken.
4. 4. The battery device according to claim 2, wherein the direction of arrangement of the fibers in the sub-fiber prepreg unidirectional tape in each frame section is parallel to the length direction of the frame section to which it belongs.
5. 5. The battery device according to claim 1, wherein the mass content of the fiber in the reinforcing layer is W, satisfying 50% or more and 75% or less.
6. 6. The battery device of claim 1, wherein 60% W is less than or equal to 75%.
7. 7. The battery device according to claim 1, wherein the protection plate further comprises an adhesive layer, the reinforcing layer and the first fibrous resin layer are connected by the adhesive layer, and/or the reinforcing layer and the second fibrous resin layer are connected by the adhesive layer.
8. 8. The battery device according to claim 7, wherein the adhesive layer has a thickness of H 1 , and 0mm < H 1 ≤0.5 mm is satisfied.
9. 9. The battery device of claim 1, wherein the thickness of the first fibrous resin layer is less than or equal to the thickness of the second fibrous resin layer.
10. 10. The battery device according to claim 1, wherein the thickness of the first fibrous resin layer is H 2 , satisfying 0mm < H 2 ∈1.2mm; And/or the thickness of the second fiber resin layer is H 3 , which satisfies 0mm < H 3 is less than or equal to 1.2mm.
11. 11. The battery device according to claim 1, wherein the reinforcing layer has a thickness H 4 , satisfying 0mm < H 4 ≤1.5 mm.
12. 12. The battery device according to claim 1, wherein the first fibrous resin layer, the reinforcing layer, and the second fibrous resin layer are stacked in this order in the second region, and the thickness of the reinforcing layer is greater than or equal to the thickness of the reinforcing layer.
13. 13. The battery device according to claim 1, wherein the first fiber resin layer includes n layers of first fiber-reinforced prepregs stacked one on another, and the second fiber resin layer includes m layers of second fiber-reinforced prepregs stacked one on another; wherein one of n and m is an odd number and the other of n and m is an even number.
14. 14. The battery device of claim 1, wherein n is an odd number and m is an even number.
15. 15. The battery device of claim 1, wherein the second region is disposed around the first region.
16. 16. An electrical device comprising a battery device according to any one of claims 1-15 for providing electrical energy.

Description

Battery device and electricity utilization device Cross Reference to Related Applications The present application claims priority from PCT patent application PCT/CN2025/071323 entitled "battery device and electric device" filed on day 2025, 1, 08, and PCT patent application PCT/CN2024/129179 entitled "battery device and electric device" filed on day 2024, 10, 31, and PCT patent application PCT/CN2024/128582 entitled "battery device and electric device" filed on day 2024, 10, 30, the entire contents of which are incorporated herein by reference. 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 utility model 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 present application provides a battery device, including a case, a battery unit, and a protection plate, where the battery unit is disposed in the case. The protection plate is arranged at the bottom of the battery monomer along the gravity direction and comprises a first fiber resin layer, a reinforcing layer, a second fiber resin layer and a reinforcing layer, the protection plate comprises a first area and a second area, the first fiber resin layer, the reinforcing layer and the second fiber resin layer are sequentially stacked in the first area, and the first fiber resin layer is positioned on one side of the reinforcing layer facing the battery monomer. In the second area, the first fiber resin layer, the second fiber resin layer and the reinforcing layer are sequentially stacked, or the reinforcing layer, the first fiber resin layer and the second fiber resin layer are sequentially stacked, or the first fiber resin layer, the reinforcing layer and the second fiber resin layer are sequentially stacked, wherein the reinforcing layer comprises a plurality of layers of mutually stacked fiber prepreg unidirectional tapes, fibers in each layer of fiber prepreg unidirectional tapes are unidirectionally arranged, and the fiber arrangement directions in each layer of fiber prepreg unidirectional tapes are the same. In the above scheme, the fibers in each layer of fiber prepreg unidirectional tape in the multi-layer mutually laminated fiber prepreg unidirectional tape of the reinforcing layer are unidirectionally arranged, and the fiber arrangement directions in each layer of fiber prepreg unidirectional tape are the same. On the one hand, the stress of each position of the reinforced layer after being stressed is more uniform, the paths of external force transmission are basically consistent, and the risk of stress concentration is reduced. On the other hand, the fibers are arranged in the same direction continuously, so that external impact can be resisted, the tensile strength of the reinforcing layer is improved, and the risk of deformation of the reinforcing layer is reduced. On the other hand, the reinforcing layer can also achieve both higher strength and lighter weight. In one or more embodiments of the first aspect, the reinforcing layer is a fiber resin frame, the fiber resin frame is arranged around the reinforcing layer, the fiber resin frame includes a plurality of frame sections connected end to end, each frame section includes a plurality of layers of mutually stacked sub-fiber prepreg unidirectional tapes, fibers in each layer of sub-fiber prepreg unidirectional tapes are unidirectionally arranged, and fiber arrangement directions in each layer of sub-fiber prepreg unidirectional tapes are the same. In the scheme, the fiber arrangement directions of the sub-fiber prepreg unidirectional tapes in each frame section are the same, so that each frame section of the reinforcing layer has higher bending strength. The reliability of the stiffening layer is further improved. In one or more embodiments of the first aspect, the fibers in the fibrous prepreg unidirectional tape in the adjacent two frame segments are broken. In the scheme, due to the fact that the fibers in the fiber prepreg unidirectional tapes in the two adjacent frame sections are disconnected, on one hand, the risk of breakage caused by excessive bending of the fibers in the forming process of the reinforcing layer can be reduced, and on the other hand, the risk of occurrence of defects such as cracks or gaps of the reinforc