Battery cells, batteries, and power consumption devices

Abstract

This application relates to the field of batteries, and specifically to battery cells, batteries, and power-consuming devices. The battery cell of this application includes a case, a cell assembly, and an insulating layer. An installation cavity is provided inside the case, the cell assembly is provided in the installation cavity, and an insulating layer is provided between at least a part of the cell assembly and the case. In the technical solution of this application, by providing an insulating layer between at least a part of the cell assembly and the case, when insulation failure occurs in the case and an electric arc or arc is generated, due to the presence of the insulating layer, the electric arc or arc generated in the case will not destroy the insulating layer. Thereby, it plays a role in protecting at least a part of the cell assembly provided opposite to the insulating layer, reducing or avoiding damage to the cell assembly, preventing the occurrence of a short-circuit phenomenon inside the cell assembly, further avoiding the occurrence of safety accidents, and enhancing the safety and reliability during the use of the battery cell.

Claims

1. A case having a mounting cavity inside, wherein an opening communicating with the mounting cavity is provided in the case, An end cap covering the aforementioned opening, A cell assembly provided in the mounting cavity, comprising a main body and a tab located at one end of the main body, An insulating layer comprising a first insulating layer and a second insulating layer, wherein the first insulating layer is provided between at least a part of the cell assembly and the case, and the second insulating layer is provided between at least a part of the cell assembly and the end cap, Includes, The battery cell is characterized in that the second insulating layer covers the end of the tab in a direction perpendicular to the tab of the cell assembly and is provided at a distance from the main body of the cell assembly.

2. The battery cell according to claim 1, further comprising a post, the post being drilled in the end cap, the post being connected to the cell assembly via a conductive sheet, and the second insulating layer being provided between at least a portion of the cell assembly and the conductive sheet.

3. The battery cell according to claim 2, characterized in that a bent portion is provided in the conductive sheet, a plug-in hole is provided in the insulating layer, and the bent portion penetrates the plug-in hole and connects to the tab.

4. The battery cell according to claim 1, characterized in that a through-hole is provided in the second insulating layer, and the through-hole communicates with a pressure reducing member in the end cap.

5. The battery cell according to claim 1, characterized in that the insulating layer is connected to the cell assembly.

6. The battery cell according to claim 1, characterized in that the first insulating layer is connected to the case.

7. The battery cell according to claim 1, characterized in that the first insulating layer is fixed between the case and the cell assembly.

8. The battery cell according to claim 2, characterized in that the second insulating layer is connected to the conductive sheet.

9. The battery cell according to claim 2, characterized in that the second insulating layer is fixed between the conductive sheet and the cell assembly.

10. The battery cell according to claim 1, characterized in that the melting point of the insulating layer is greater than 250°C and less than 1000°C.

11. The battery cell according to claim 1, characterized in that the insulating layer includes at least one of a polyimide layer, a phenolic plastic layer, a ceramic layer, and a polytetrafluoroethylene layer.

12. The battery cell according to claim 1, characterized in that the thickness of the insulating layer is D, where 0.05 mm < D < 2 mm, and the voltage of the battery cell is V, where 200 V / mm < V / D < 40000 V / mm.

13. The battery cell according to claim 1, characterized in that the total weight of the insulating layer is 0.1% to 1% of the total weight of the battery cell.

14. The battery cell according to claim 1, characterized in that the cell assembly has a cubic structure, and the first insulating layer is provided between at least one of the two longitudinal sides of the cell assembly and the case.

15. The battery cell according to claim 1, characterized in that the cell assembly has a cubic structure, and the first insulating layer is provided between at least one of the two sides of the cell assembly in the width direction and the case.

16. The battery cell according to claim 1, characterized in that the cell assembly has a cubic structure, and the first insulating layer is provided between the bottom surface of the cell assembly and the case.

17. The battery cell according to claim 1, characterized in that the cell assembly has a cubic structure and the second insulating layer is provided on the upper surface of the cell assembly.

18. The battery cell according to claim 1, characterized in that the insulating layer completely covers the surface of the corresponding cell assembly.

19. A battery characterized by having a battery cell according to any one of claims 1 to 18.

20. A power consumption device characterized by having the battery described in claim 19.

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