电池单体、电池装置及用电装置

Abstract

本申请涉及一种电池单体、电池装置及用电装置。电池单体包括壳体，一侧具有开口；端盖，盖设于开口处，并与壳体围合形成容纳腔；电极组件，设于容纳腔内；其中，端盖包括基片及凸台，沿端盖的厚度方向，凸台凸伸于基片的一侧；凸台包括位于边缘的侧壁及背向基片一侧的底壁，侧壁与基片之间形成台阶槽，底壁形成有凹槽，凹槽邻近台阶槽设置。在端盖冲压成型时，需要冲压形成台阶槽和凹槽，因此，冲压凹槽时产生的材料流动能够弥补凸台的侧壁远离基片一端的尺寸，故能够减小凸台的侧壁上下尺寸之间的差异，提升凸台的侧壁的平直度，减小壳盖焊接时泄露激光的情况。

Claims

1. A battery cell, characterized by, include: The shell has an opening; An end cap is provided at the opening and forms a receiving cavity with the housing; The electrode assembly is disposed within the receiving cavity; The end cap includes a substrate and a boss. Along the thickness direction of the end cap, the boss protrudes from the side of the substrate facing the receiving cavity. The boss includes a bottom wall facing away from the substrate and a side wall connected to the edge of the bottom wall. A stepped groove is formed between the side wall and the substrate. The stepped groove is positioned and engaged with the housing. A groove is formed on the bottom wall, and the groove is disposed adjacent to the stepped groove.

2. The battery cell of claim 1, wherein, The sidewall extends in a direction parallel to the thickness direction of the end cap.

3. The battery cell of claim 1, wherein, Along the length of the end cap, the shortest distance between the groove and the stepped groove ranges from 0.2 mm to 10 mm.

4. The battery cell according to any one of claims 1 to 3, characterized in that Along the thickness direction of the end cap, the depth of the groove is less than the depth of the stepped groove.

5. The battery cell of claim 4, wherein, The sidewall and bottom wall of the boss have a chamfer. Along the thickness direction of the end cap, the depth of the groove is the same as the width of the chamfer, or the depth of the groove is greater than the width of the chamfer.

6. The battery cell of claim 4, wherein, The end cap has a thickness of T, and the groove has a depth greater than 0.05 mm and less than or equal to 0.5T.

7. The battery cell of claim 6, wherein, The depth of the groove is less than or equal to 0.4T.

8. The battery cell of any one of claims 1-3, wherein, Along the length of the end cap, the width of the groove is greater than 0.05 mm and less than or equal to 20 mm.

9. The battery cell of claim 8, wherein, Along the length of the end cap, the width of the groove is less than 5 mm.

10. The battery cell of any one of claims 1-3, wherein, The groove is in the shape of a semi-circle, a semi-ellipse, or a trapezoid.

11. The battery cell of any one of claims 1-3, wherein, The end cap material has a yield strength range greater than 115 MPa and less than or equal to 500 MPa.

12. The battery cell of claim 11, wherein, The end cap material has a Vickers hardness greater than 50 HV and a tensile strength greater than 125 MPa.

13. The battery cell of any one of claims 1-3, wherein, The end cap is made of pure titanium or a titanium alloy.

14. The battery cell of any one of claims 1-3, wherein, The stepped groove is arranged in a ring shape along the circumference of the end cap, and the groove is arranged in a closed ring shape and concentric with the stepped groove; or, the groove is arranged in a non-closed ring shape and concentric with the stepped groove.

15. A battery device characterized by comprising: Includes the battery cell as described in any one of claims 1 to 14.

16. An electrical device, comprising: Includes the battery device as described in claim 15.

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