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。该电池单体包括：壳体，具有开口，端盖，盖设于开口；壳体包括分体设置的第一部分和第二部分，第一部分包括第一主体部，第二部分包括一体成型的侧部和底部，侧部的主侧部和底部相邻设置，侧部的延伸部位于第一主体部在第一方向上的至少一侧，且延伸部与第一主体部平行；第一主体部的壁厚大于侧部的壁厚，第一主体部上设置有泄压机构；第一部分与延伸部固定连接，第一部分相对于延伸部朝向壳体内部凸出，且凸出的部分和侧部的弯折部的内表面在垂直于第一方向的平面上的投影至少部分重合。本申请实施例的电池单体、电池装置和用电设备，能够兼顾电池单体的结构稳定性和整体性能。

Claims

1. A battery cell, characterized by, include: A housing (21) having an opening; End cap (22), which covers the opening and together with the housing (21) forms a receiving space; The housing (21) includes a first part (211) and a second part (212), which are separate structures. The first part (211) includes a first main body (2111), and the second part (212) includes a bottom (2122) and a side part (2121). The bottom (2122) and the side part (2121) are integral structures. The bottom (2122) and the first main body (2111) are disposed opposite to each other. The side part (2121) includes a main side part (2121a). The main side portion (2121a) is disposed adjacent to the bottom portion (2122), the extension portion (2121b) is located on at least one side of the first main body portion (2111) in a first direction, and the outer surface of the extension portion (2121b) is parallel to the outer surface of the first main body portion (2111). The bending portion (2121c) connects the main side portion (2121a) and the extension portion (2121b). The first direction is perpendicular to the thickness direction of the first main body portion (2111). The wall thickness of the first main body (2111) is greater than the wall thickness of the side part (2121), and a pressure relief mechanism (23) is provided on the first main body (2111); In the thickness direction of the first main body (2111), the first part (211) protrudes toward the interior of the housing (21) relative to the inner surface of the extension (2121b), the first part (211) is fixedly connected to the extension (2121b), and the portion of the first part (211) protruding toward the interior of the housing (21) relative to the extension (2121b) and the projection of the inner surface of the bent part (2121c) onto a plane perpendicular to the first direction at least partially coincide.

2. The battery cell of claim 1, wherein, The battery cell also includes an electrode assembly (24), which is housed in the housing space; In the thickness direction of the first main body (2111), the inner surface of the first main body (2111) is closer to the electrode assembly (24) than the inner surface of the bent portion (2121c), and the first main body (2111) abuts against the electrode assembly (24).

3. The battery cell of claim 2, wherein, The outer surface of the extension (2121b) is flush with the outer surface of the first main body (2111).

4. The battery cell of claim 1, wherein, The first part (211) further includes a plurality of edge portions located at the edge of the first main body (2111), the thickness of the edge portions being less than the thickness of the first main body (2111), and the thickness difference between the edge portions and the extension portion (2121b) being less than the thickness difference between the edge portions and the first main body (2111).

5. The battery cell of claim 4, wherein, The plurality of said edge portions include at least one first edge portion (2112), at least one first edge portion (2112) being located on at least one side of the first body portion (2111) in the first direction, the first direction being the width direction of the first body portion (2111), and the side portion (2121) being disposed on the side of the first body portion (2111) having the first edge portion (2112).

6. The battery cell of claim 5, wherein, The end of the first main body (2111) near the extension (2121b) is welded to the extension (2121b) to form a first welded part (210).

7. The battery cell of claim 6, wherein, The extension (2121b) and the first edge portion (2112) at least partially overlap in the thickness direction of the first main body portion (2111), the first edge portion (2112) is disposed on the side of the extension (2121b) close to the interior of the housing (21), and the first weld portion (210) is located on the side of the inner surface of the first edge portion (2112) away from the interior of the housing (21).

8. The battery cell of claim 5, wherein, The first edge portion (2112) is welded to the extension portion (2121b) to form a second weld portion (220).

9. The battery cell of claim 8, wherein, The extension (2121b) and the first edge (2112) at least partially overlap in the thickness direction of the first main body (2111), and a portion of the second weld (220) is located in the extension (2121b), while another portion of the second weld (220) is located in the first edge (2112).

10. The battery cell of claim 9, wherein, The extension (2121b) is disposed on the side of the first edge portion (2112) away from the interior of the housing (21), and the second weld portion (220) is disposed on the inner surface of the first edge portion (2112) away from the interior of the housing (21).

11. The battery cell of claim 8, wherein, The extension (2121b) and the first edge (2112) are arranged side by side in the first direction, and a portion of the second weld (220) is located in the extension (2121b), while another portion of the second weld (220) is located in the first edge (2112).

12. The battery cell of claim 11, wherein, The second welding part (220) is disposed on the inner surface of the extension (2121b) away from the inside of the housing (21), and the second welding part (220) is disposed on the inner surface of the first edge part (2112) away from the inside of the housing (21).

13. The battery cell of claim 5, wherein, The first part (211) includes two first edge portions (2112) located on both sides of the first main body portion (2111) in the first direction, and the second part (212) includes two side portions (2121) located on both sides of the bottom (2122) in the first direction; Each of the side portions (2121) includes the main side portion (2121a), the bent portion (2121c), and the extension portion (2121b). In the first direction, the two ends of the first main body portion (2111) or the ends of the two first edge portions (2112) away from the first main body portion (2111) are respectively fixedly connected to the extension portions (2121b) of the two side portions (2121).

14. The battery cell of claim 5, wherein, The dimension T2 of the first edge portion (2112) in the first direction is in the range of 0.3mm≤T2≤10mm.

15. The battery cell of any one of claims 1 to 14, wherein, The first part (211) further includes a second edge part (2113), which is located on at least one side of the first main body part (2111) in a second direction, the second direction being the length direction of the first main body part (2111). The thickness of the second edge part (2113) is less than the thickness of the first main body part (2111). The second edge part (2113) is welded to the end cap (22), which has a side surface (2201). At least a portion of the second edge part (2113) is disposed opposite to the side surface (2201).

16. The battery cell of claim 15, wherein, The inner surface of the second edge portion (2113) is flush with the inner surface of the extension portion (2121b), or the inner surface of the second edge portion (2113) is located on the side of the inner surface of the extension portion (2121b) away from the interior of the housing (21).

17. The battery cell of claim 16, wherein, The inner surface of the second edge portion (2113) is further away from the interior of the housing (21) than the inner surface of the first main body portion (2111).

18. A battery device characterized by comprising: The battery device includes: The box (11) has a receiving space; A plurality of battery cells according to any one of claims 1 to 17, wherein the plurality of battery cells are accommodated in the accommodating space.

19. An electrical device, characterized by The battery cell includes any one of claims 1 to 17 or the battery device includes the battery device according to claim 18, wherein the battery cell or the battery device is used to provide electrical energy.

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