CN-122029658-A - Battery monomer, battery and electricity utilization device

Abstract

The application relates to a battery cell, a battery and an electric device. The battery cell includes a housing, an electrode assembly, an electrolyte, and a wicking assembly. The electrolyte absorbing device comprises an electrode assembly and electrolyte, wherein the electrode assembly and the electrolyte are contained in a shell, the liquid absorbing assembly is arranged on at least part of the surface of the electrode assembly, the liquid absorbing assembly comprises a substrate layer and a liquid absorbing layer, the liquid absorbing layer is connected to at least one side surface of the substrate layer along the thickness direction of the substrate layer and used for absorbing the electrolyte, and the impact strength of the substrate layer is larger than that of the liquid absorbing layer. The liquid absorbing component can absorb electrolyte, and is beneficial to utilizing the free electrolyte in the battery, thereby being beneficial to maximizing the utilization rate of the free electrolyte and realizing 'no leakage of the battery'. The electrolyte absorbing layer can discharge electrolyte after being extruded, and can be released to the electrode assembly for use when the electrolyte is needed to be used, so that the problem of corrosion of free electrolyte is solved. The expansion of the liquid absorption layer improves the constraint of the electrode assembly, improves the supporting effect of the electrode assembly, and can improve the lithium precipitation problem of the thinned area.

Inventors

• HUANG WEIHONG
• XU LIANGFAN
• ZHANG QIANQIAN
• XU HU
• LI XING
• JIN HAIZU

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20240815

Claims (19)

1. A battery cell, comprising: A housing; An electrode assembly accommodated in the case; an electrolyte contained in the case; The liquid absorption assembly is arranged on at least part of the surface of the electrode assembly and comprises a substrate layer and a liquid absorption layer, the liquid absorption layer is connected to at least one side surface of the substrate layer along the thickness direction of the substrate layer and used for absorbing electrolyte, and the impact strength of the substrate layer is larger than that of the liquid absorption layer.
2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The electrode assembly comprises a main body area and a thinning area along a first direction, wherein the thinning area is connected with the main body area, and the thickness of a pole piece of the electrode assembly in the main body area is larger than that of the pole piece of the electrode assembly in the thinning area; the absorbent assembly is at least partially disposed in the skived zone.
3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, The absorbent assembly is disposed in the body region and the skived region.
4. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells, The liquid absorbing assembly comprises a first liquid absorbing assembly and a second liquid absorbing assembly, wherein the first liquid absorbing assembly is arranged in the skiving area; the second liquid absorbing component is arranged in the main body area and comprises a second liquid absorbing layer; The thickness of the first liquid absorbing layer is greater than that of the second liquid absorbing layer.
5. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, The skived region is located at an edge of the electrode assembly.
6. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The electrode assembly includes an end face; The liquid absorbing component is arranged on the end face.
7. The battery cell according to any one of claims 1 to 6, wherein, The liquid absorbing component is arranged between the electrode component and the shell, the substrate layer is contacted with the shell, the liquid absorbing layer is contacted with the surface of the electrode component, and the substrate layer is provided with holes.
8. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells, The base layer is bonded to the housing.
9. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells, The electrode assembly includes a side surface, and the liquid absorbing assembly is disposed on the side surface.
10. The battery cell according to any one of claims 1-9, wherein, The thickness of the liquid absorbing layer is 50-100 mu m.
11. The battery cell according to any one of claims 1 to 10, wherein, The thickness of the liquid absorbing layer is 60-80 mu m.
12. The battery cell according to any one of claims 1-11, wherein, The liquid absorbing layer is a polystyrene film layer.
13. The battery cell according to any one of claims 1-12, wherein, The number of the liquid absorbing layers comprises a plurality of liquid absorbing layers; And a glue layer is arranged among the plurality of liquid absorption layers.
14. The battery cell of claim 13, wherein the battery cell comprises a plurality of cells, The thickness of the adhesive layer is 5-15 mu m.
15. The battery cell according to any one of claims 1-14, wherein, The thickness of the substrate layer is 5-15 mu m.
16. The battery cell according to any one of claims 1-15, wherein, The substrate layer is a polyethylene terephthalate film layer or a heat-conducting silica gel layer.
17. The battery cell of any one of claims 1-16, wherein the cell comprises a plurality of cells, The battery monomer is a square shell battery monomer.
18. A battery comprising a cell according to any one of claims 1-17.
19. An electrical device comprising a cell according to any one of claims 1 to 17 for providing electrical energy.

Description

Battery monomer, battery and electricity utilization device Technical Field The application relates to a battery cell, a battery and an electric device. Background In recent years, with the development of lithium ion battery technology, lithium ion batteries are widely applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, and various fields such as electric tools, electric bicycles, electric motorcycles, electric automobiles, military equipment, aerospace and the like. As lithium ion batteries have been greatly developed, higher demands are being made on their corrosion resistance, inhibition of lithium precipitation, and the like. Disclosure of Invention The application aims to provide a battery cell, a battery and an electric device. Embodiments of the present application are implemented as follows: in a first aspect, an embodiment of the present application provides a battery cell, including: A housing; An electrode assembly accommodated in the case; an electrolyte contained in the case; The liquid absorption assembly is arranged on at least part of the surface of the electrode assembly and comprises a substrate layer and a liquid absorption layer, the liquid absorption layer is connected to at least one side surface of the substrate layer along the thickness direction of the substrate layer and used for absorbing electrolyte, and the impact strength of the substrate layer is greater than that of the liquid absorption layer. In the above technical scheme, the liquid absorbing assembly is arranged on the electrode assembly, the liquid absorbing layer of the liquid absorbing assembly can absorb electrolyte and expand, and the liquid absorbing layer can discharge the electrolyte after being extruded. The liquid absorbing component can absorb electrolyte, utilizes free electrolyte in the battery, is favorable for maximizing the utilization rate of the free electrolyte, and is favorable for realizing no leakage of the battery. The electrolyte can be discharged after being extruded by the liquid absorbing layer, and the electrolyte can be released to the electrode assembly for use when the electrolyte is needed to be used, so that the problems that excessive free electrolyte corrodes the electrode assembly, the top cover of the battery cell and the bottom of the battery cell can be avoided. And the binding of the electrode assembly is greatly improved when the liquid absorbing layer expands, the supporting function of the electrode assembly is improved, and the lithium precipitation problem of the thinning area of the electrode assembly can be improved. In some alternative embodiments, the electrode assembly includes a body region and a skived region along a first direction, the skived region being connected to the body region, a thickness of the electrode assembly's electrode sheet in the body region being greater than a thickness of the electrode assembly's electrode sheet in the skived region; The absorbent assembly is at least partially disposed in the skived zone. According to the technical scheme, the liquid absorption component is at least partially arranged in the skiving area, so that the binding effect on the electrode component can be greatly improved, the supporting effect on the skiving area of the electrode component can be improved, the bonding compactness of the pole piece and the diaphragm in the skiving area is improved, and the lithium precipitation problem in the skiving area of the electrode component can be improved. In some of the alternative embodiments of the present invention, The absorbent assembly is disposed in the body region and the skiving region. According to the technical scheme, the liquid absorbing layers with different thicknesses are arranged in the main body area and the thinning area, namely, the thickness of the first liquid absorbing layer is larger than that of the second liquid absorbing layer, so that the utilization rate of the liquid absorbing component is improved on the premise that the binding function of the electrode component is improved and the supporting function of the thinning area is cooperated. In some alternative embodiments, the absorbent assembly includes a first absorbent assembly and a second absorbent assembly, the first absorbent assembly being disposed in the skived zone; the second liquid absorbing component is arranged in the main body area and comprises a second liquid absorbing layer; the thickness of the first liquid absorbing layer is greater than that of the second liquid absorbing layer. According to the technical scheme, the liquid absorbing layers with different thicknesses are arranged in the main body area and the thinning area, namely, the thickness of the first liquid absorbing layer is larger than that of the second liquid absorbing layer, so that the utilization rate of the liquid absorbing component is improved on the premise that the binding function of the elec