电池单体、电池装置和用电设备

Abstract

本申请实施例公开了一种电池单体、电池装置和用电设备。该池单体包括：外壳，该外壳包括第一壁，该第一壁设置有泄压机构；过滤件，该过滤件设置于该泄压机构的朝向该电池单体的内部的一侧，该过滤件包括沿第一方向层叠设置的多层结构，该多层结构中的每层结构设置有多个通孔，该多层结构的通孔在该第一方向上连通，以形成沿该第一方向延伸的至少两个通道，至少一个该通道在该第二方向上的孔径小于用于形成该通道的通孔在该第二方向上的孔径，该第二方向垂直于该第一方向。本申请实施例的电池单体、电池装置和用电设备，能够提高电池装置的可靠性。

Claims

1. A battery cell, characterized by, include: The outer casing (21) includes a first wall (211) and the first wall (211) is provided with a pressure relief mechanism (212). A filter element (22) is disposed on the side of the pressure relief mechanism (212) facing the interior of the battery cell. The filter element (22) includes a multi-layer structure stacked along a first direction. Each layer of the multi-layer structure is provided with a plurality of through holes. The through holes of the multi-layer structure are connected in the first direction to form at least two channels (225) extending along the first direction. The aperture of at least one of the channels (225) in a second direction is smaller than the aperture of the through hole used to form the channel (225) in the second direction. The second direction is perpendicular to the first direction.

2. The battery cell of claim 1, wherein, The multi-layer structure includes a first structural layer (221) and a second structural layer (222). On a projection plane perpendicular to the first direction, the midpoint of the orthographic projection of at least one through hole of the first structural layer (221) does not overlap with the midpoint of the orthographic projection of each through hole of the second structural layer (222).

3. The battery cell of claim 2, wherein, On the projection plane perpendicular to the first direction, the minimum distance between the midpoint of the orthographic projection of the first through hole (2211) of the first structural layer (221) and the midpoint of the orthographic projection of each through hole of the second structural layer (222) is D. The value range of D is: 0.2R≤D≤0.8R, where R is the aperture of the first through hole (2211) in the second direction.

4. The battery cell of claim 2, wherein, On the projection plane perpendicular to the first direction, the midpoint of the orthographic projection of each through hole of the first structural layer (221) does not overlap with the midpoint of the orthographic projection of each through hole of the second structural layer (222).

5. The battery cell of claim 1, wherein, On a projection plane perpendicular to the first direction, the orthographic projection of the filter element (22) overlaps the orthographic projection of the pressure relief mechanism (212).

6. The battery cell of claim 1, wherein, On a projection plane perpendicular to the first direction, the orthographic projection areas of multiple through holes in the same structural layer of the multilayer structure are the same.

7. The battery cell of claim 6, wherein, On a plane perpendicular to the first direction, the areas of the orthographic projections of the multiple through holes in the multilayer structure are the same.

8. The battery cell of claim 1, wherein, The multiple through holes in the same structural layer of the multilayer structure have the same diameter in the second direction.

9. The battery cell of claim 8, wherein, The multiple through holes in the multilayer structure have the same diameter in the second direction.

10. The battery cell of claim 1, wherein, The multiple through holes in the same structural layer of the multilayer structure have the same shape.

11. The battery cell of claim 10, wherein, The multiple through holes in the multilayer structure have the same shape.

12. The battery cell of any one of claims 1 to 11, wherein, The material of the filter element (22) is any one of the following: Steel, carbon fiber, nickel-based alloys, ceramic fibers, or ceramic matrix composites.

13. The battery cell of any one of claims 1 to 11, wherein, The through holes in each layer are formed by a stamping process or a weaving process.

14. The battery cell of any one of claims 1 to 11, wherein, Along the first direction, the spacing between any two adjacent layers in the multilayer structure is the same.

15. The battery cell of any one of claims 1 to 11, wherein, Along the first direction, the thickness of different structural layers in the multilayer structure is the same.

16. The battery cell of any one of claims 1-11, wherein, Along the first direction, the thickness of each layer is greater than or equal to 0.01 mm and less than or equal to 0.5 mm.

17. The battery cell of any one of claims 1 to 11, wherein, The battery cell also includes: An insulating element (23) is disposed on the side of the first wall (211) facing the interior of the battery cell. The insulating element (23) is provided with a first groove (231) with an opening facing the pressure relief mechanism (212). At least a portion of the filter element (22) is accommodated in the first groove (231).

18. A battery device characterized by comprising: include: The battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized by include: A battery device comprising a battery cell according to any one of claims 1 to 17.

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