电池单体、电池装置、用电装置和储能装置

Abstract

本申请实施例提供了一种电池单体、电池装置、用电装置和储能装置，能够提高电池单体的使用性能。该电池单体包括：外壳和电极组件，外壳内部形成容纳腔，外壳包括壳体和端盖，壳体具有开口，壳体包括第一壁，端盖盖合于开口，电极组件容纳于容纳腔，第一壁包括靠近开口的第一区域，第一区域的朝向容纳腔的至少部分表面与端盖焊接连接，第一区域的残余压应力大于第一壁的除第一区域以外的其它区域的残余压应力。

Claims

1. A battery cell, characterized by, include: The outer shell (21) has an internal cavity (50) and includes a housing (211) and an end cap (212). The housing (211) has an opening (510) and includes a first wall (60). The end cap (212) covers the opening (510). Electrode assembly (22) is housed in the receiving cavity (50); The first wall (60) includes a first region (610) near the opening (510), at least a portion of the surface of the first region (610) facing the receiving cavity (50) is connected to the end cap (212), and the residual compressive stress of the first region (610) is greater than the residual compressive stress of other regions of the first wall (60) other than the first region (610).

2. The battery cell of claim 1, wherein, Along the thickness direction of the end cap (212), the minimum dimension D1 between the side of the first region (610) near the opening (510) and the opening (510) satisfies: 1mm≤D1≤3mm.

3. The battery cell of claim 2, wherein, The minimum dimension D2 of the first region (610) along the thickness direction of the end cap (212) satisfies: 4mm≤D2≤5mm.

4. The battery cell of claim 1, wherein, The first region (610) includes a first reinforced surface (611) facing the end cap (212) and / or a second reinforced surface (612) away from the end cap (212).

5. The battery cell of claim 4, wherein, The roughness of the first reinforced surface (611) and / or the second reinforced surface (612) is greater than the roughness of the surfaces corresponding to other regions of the first wall (60) other than the first region (610).

6. The battery cell of claim 4, wherein, The first reinforced surface (611) and / or the second reinforced surface (612) are provided with a plurality of groove structures (613).

7. The battery cell of claim 1, wherein, The housing (211) includes a plurality of first regions (610) spaced apart along a first direction perpendicular to the thickness direction of the end cap (212).

8. The battery cell of claim 7, wherein, Multiple first regions (610) are arranged at equal intervals along the first direction.

9. The battery cell of any one of claims 1 to 8, wherein, The housing (211) has one of the openings (510), and the housing (211) includes a bottom wall (70) opposite to the opening (510), the bottom wall (70) being connected to the first wall (60). The first wall (60) also includes a second region (620) near the bottom wall (70), the residual compressive stress of the second region (620) being greater than the residual compressive stress of the other regions of the first wall (60) besides the second region (620) and the first region (610).

10. The battery cell of any one of claims 1 to 8, wherein, The housing (211) has two opposing openings (510), the battery cell includes two end caps (212) which respectively cover the two openings (510), and the first wall (60) includes two first regions (610) respectively adjacent to the two openings (510).

11. The battery cell according to claim 10, characterized in that, The first wall (60) also includes a third region (630) located between the two openings (510), the residual compressive stress of the third region (630) being greater than the residual compressive stress of the other regions of the first wall (60) besides the third region (630) and the two first regions (610).

12. The battery cell of claim 11, wherein, The battery cell is a square battery cell. On a plane perpendicular to the thickness direction of the first wall (60), the orthographic projection of the third region (630) does not overlap with the orthographic projections of the two first regions (610).

13. The battery cell of any one of claims 1 to 8, wherein, The battery cell is a square battery cell, and the first wall (60) is the wall with the largest area of ​​the casing (211).

14. The battery cell of any one of claims 1 to 8, wherein, The residual compressive stress value A1 in the first region (610) satisfies: 50MPa≤A1≤150MPa.

15. A battery device characterized by comprising: include: Multiple battery cells, wherein the battery cells are as described in any one of claims 1 to 14.

16. An electrical device, comprising: include: The battery device of claim 15, wherein the battery device is used to provide electrical energy to the electrical device.

17. An energy storage device, characterized by include: The battery device of claim 15, wherein the battery device is used to store electrical energy for the energy storage device.

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