电池单体、电池装置和用电装置

Abstract

本申请公开了一种电池单体、电池装置和用电装置，电池单体包括：第一部件、第二部件和第一密封件，第一密封件密封在第一部件和第二部件之间，第一密封件在装配状态，第一密封件包括相连的第一段和第二段，第一段的至少部分区域的截面面积大于第二段各处的截面面积，其中，第一段沿直线或第一曲线弯曲，第二段沿第二曲线弯曲，第一曲线在第一段的各处的曲率均小于第二曲线在第二段的各处的曲率。根据本申请的电池单体，通过使得至少部分的第一段的截面面积较大，可以较好地提高第一段的结构强度，使得第一段不易发生褶皱甚至断裂，进而能有效提高第一密封件的密封稳定性，使得电池单体具备较好地密封性，电池单体不易发生密封失效。

Claims

1. A battery cell (1) characterized in that, include: A first component (11), a second component (12), and a first seal (13), wherein the first seal (13) seals between the first component (11) and the second component (12), and the first seal (13) is in an assembled state. The first seal (13) includes a first segment (131) and a second segment (132) connected together, wherein at least a portion of the cross-sectional area of ​​the first segment (131) is larger than the cross-sectional area at various points of the second segment (132), wherein... The first segment (131) extends along a straight line or curves along a first curve, and the second segment (132) extends along a second curve. The curvature of the first curve at each point in the first segment (131) is less than the curvature of the second curve at each point in the second segment (132). The cross section at each position of the first segment (131) is perpendicular to the straight line or the first curve at that position, and the cross section at each position of the second segment (132) is perpendicular to the second curve at that position.

2. The battery cell (1) according to claim 1, characterized in that The cross-sectional area of ​​all regions of the first segment (131) is greater than or equal to the cross-sectional area of ​​each part of the second segment (132).

3. The battery cell (1) according to claim 1, characterized in that The second component (12) has an assembly hole (121) with a hole wall (1211). The first component (11) has a sealing surface (111) opposite to the hole wall (1211). The first seal (13) abuts against the sealing surface (111) and the hole wall (1211) on both sides along the first direction (X). In the second direction (Y), the first segment (131) has a protrusion (1311). The cross-sectional area of ​​the first segment (131) at the protrusion (1311) is greater than the cross-sectional area of ​​the second segment (132). The first direction (X) is parallel to the radial direction of the assembly hole (121), and the second direction (Y) is parallel to the axial direction of the assembly hole (121).

4. The battery cell (1) according to claim 3, characterized in that, In the second direction (Y), the size of the hole wall (1211) is larger than the size of the first seal (13), and the protrusion (1311) is located within the assembly hole (121); or, In the second direction (Y), the size of the hole wall (1211) is smaller than the size of the first seal (13), at least a portion of the protrusion (1311) is located outside the assembly hole (121), the first component (11) is provided with a relief groove (10), and at least a portion of the protrusion (1311) is located inside the relief groove (10).

5. The battery cell (1) according to claim 1, characterized in that The first component (11) has a first mating surface (112), and the second component (12) has an assembly hole (121) and a second mating surface (122). The second mating surface (122) surrounds the outer periphery of the assembly hole (121). The first sealing member (13) abuts against the first mating surface (112) and the second mating surface (122) on both sides along the second direction (Y). In the first direction (X), the first segment (131) has a protrusion (1311). The cross-sectional area of ​​the first segment (131) at the protrusion (1311) is greater than the cross-sectional area of ​​the second segment (132). The first direction (X) is parallel to the radial direction of the assembly hole (121), and the second direction (Y) is parallel to the axial direction of the assembly hole (121).

6. The battery cell (1) according to claim 5, characterized in that It also includes an insulating element (14), a portion of which is located between the first mating surface (112) and the second mating surface (122). In the radial direction of the mounting hole (121), the insulating element (14) has a first surface (141) and a second surface (142) opposite to the first seal (13). The protrusion (1311) is located on the side of the first seal (13) facing the first surface (141) and / or the second surface (142). The first surface (141) and / or the second surface (142) have a relief groove (10). At least a portion of the protrusion (1311) is located within the relief groove (10).

7. The battery cell (1) according to claim 5, characterized in that, The first mating surface (112) is provided with a first sealing groove, and along the second direction (Y), a portion of the first sealing element (13) is located in the first sealing groove; and / or, The second mating surface (122) is provided with a second sealing groove (1221), and along the second direction (Y), a portion of the first sealing member (13) is located in the second sealing groove (1221).

8. The battery cell (1) according to claim 6, characterized in that Along the radial direction of the mounting hole (121), the protrusion (1311) is located on the side of the first segment (131) opposite to the mounting hole (121).

9. The battery cell (1) according to any one of claims 3-8, characterized in that, The protrusion (1311) is constructed as an elongated strip extending along the length direction of the first segment (131), and / or, a plurality of protrusions (1311) are provided, and the plurality of protrusions (1311) are arranged at intervals along the length direction of the first segment (131).

10. The battery cell (1) according to claim 1, characterized in that The battery cell (1) includes: The battery case (15), the cell assembly (16), and the electrolyte are both contained within the battery case (15), which includes the first component (11) and the second component (12).

11. The battery cell (1) according to claim 10, characterized in that The electrolyte includes ester solvents, and / or the material of the first seal (13) is one of fluororubber, EPDM, and nitrile rubber.

12. The battery cell (1) according to claim 10, characterized in that The battery casing (15) includes a casing (151) and a cover assembly (152). The cover assembly (152) covers the opening of the casing (151). The cover assembly (152) includes a cover body (1521), a terminal post (1522) disposed on the cover body (1521), and a valve body. The first component (11) is the cover body (1521), and the second component (12) is the terminal post (1522) and / or the valve body.

13. The battery cell (1) according to claim 12, characterized in that In the width direction of the cover plate body (1521), the size of the cover plate body (1521) is W1 and the size of the pole post (1522) is W2, satisfying: 1 / 2≤W2 / W1≤4 / 5.

14. The battery cell (1) according to claim 10, characterized in that The battery cell assembly (16) includes a current collector (1611) and a tab (1612) connected to the end of the current collector (1611). The line connecting the current collector (1611) and the tab (1612) is a connecting line. Along the direction parallel to the connecting line, the size of the current collector (1611) is W3 and the size of the tab (1612) is W4, satisfying: 7 / 10≤W4 / W3≤1.

15. The battery cell (1) according to claim 10, characterized in that The battery cell assembly (16) includes a plurality of electrode sheets (161) stacked along a third direction. Each electrode sheet (161) includes a current collector (1611) and a tab (1612). The tabs (1612) of the plurality of electrode sheets (161) are connected to form a tab (1612) group. The battery cell (1) also includes an adapter piece (162). The adapter piece (162) is connected between the tab (1612) group and the terminal post (1522). Along the third direction, the size of the connection between the adapter piece (162) and the tab (1612) group is W5, and the size of the tab (1612) group is W6, satisfying: 3 / 20≤W5 / W6≤7 / 10.

16. A battery device (100), characterized by Includes the battery cell (1) according to any one of claims 1-15.

17. The battery device (100) according to claim 16, characterized in that Also includes: The third component, the fourth component, and the second seal are sealed between the third component and the fourth component. The second seal has the same structural features as the first seal (13) of the battery cell (1).

18. An electrical device, comprising: Includes the battery device (100) as described in claim 16 or 17.

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