Batteries, battery assemblies, and power equipment

Abstract

A battery, a battery module, and a power device. The battery comprises a case, a cover plate, and a current collector, wherein a cell housing cavity is formed within the case, an opening is formed at at least one end of the case, a cover plate is joined to the case and covers the opening, an explosion-proof valve is provided on the cover plate, a current collector is positioned within the cell housing cavity, and the current collector is spaced apart from at least a portion of the cover plate, thereby forming a pressure-relieving cavity that communicates with the explosion-proof valve.

Claims

1. A battery core housing cavity (111) is formed within the housing (11), and at least one end of the housing (11) forms an opening (112), the housing (11) and A cover plate (12) is joined to the housing (11), covers the opening (112), and has an explosion-proof valve (16) disposed on the cover plate (12), Displaced within the battery core housing cavity (111), the current collector disk (13) is separated from at least a portion of the cover plate (12) and forms a pressure release cavity that communicates with the explosion-proof valve (16), and A battery (1) characterized by having the following features.

2. The battery (1) according to claim 1, wherein at least one of the surfaces of the cover plate and the current collector disk (13) facing each other is formed to have recesses that are set apart from each other, and the recesses define the pressure release cavity therein.

3. The battery (1) according to claim 1 or 2, wherein the surface of the current collector disk (13) facing the cover plate (12) is formed to have a pressure release groove (131), the bottom wall of the pressure release groove (131) is spaced apart from the cover plate (12) to define the pressure release cavity, and the pressure release groove (131) at least partially overlaps with the projection of the explosion-proof valve (16) in the thickness direction of the current collector disk (13).

4. The battery (1) according to any one of claims 1 to 3, wherein the surface of the current collector disk (13) facing away from the cover plate (12) is formed to have a first projection (141), and the first projection (141) is adapted to contact and weld with the electrode tab (21) of the battery core (20) in the battery core housing cavity (111).

5. The battery (1) according to claim 4, wherein the side of the cover plate (12) facing the current collector disk (13) is formed to have a second projection (142), and the second projection (142) is adapted to abut against the surface of the current collector disk (13) facing the cover plate (12).

6. The battery (1) according to claim 5, wherein the current collector disk (13) is arranged to overlap with the cover plate (12) in the thickness direction of the battery (1), and the protrusions of the first protrusion (141) and the second protrusion (142) on the plane on which the cover plate (12) is located are offset or partially overlap.

7. At least a portion of the first projection (141) is arranged around the periphery of the central axis of the current collector disk (13), or The battery (1) according to claim 5 or 6, wherein at least a portion of the second protrusion (142) is arranged around the central axis periphery of the cover plate (12).

8. The battery (1) according to any one of claims 1 to 7, wherein the surface of the current collector disk (13) facing the cover plate (12) is recessed to form a pressure release groove (131) on the side of the current collector disk (13), a first projection (141) is formed on the other side of the current collector disk (13), and the first projection (141) abuts against and is welded to the electrode tab (21).

9. The pressure release groove (131) is The first groove (1311) is configured as a fan-shaped groove surrounding at least a portion of the outer circumference of the central axis of the current collector disk (13), One end of the second groove (1312) communicates with the end of the first groove (1311) in the circumferential direction, and the second groove (1312) extends in the radial direction. The battery (1) according to claim 8, comprising:

10. The battery (1) according to claim 9, wherein the outer peripheral edge of the current collector disk (13) is formed to have an outer edge portion (133) that protrudes outward along the radial direction, and the other end of the second groove portion (1312) extends to the outer edge portion (133).

11. The battery (1) according to any one of claims 1 to 10, wherein the current collector disk (13) is formed having a welded portion adapted to join with an electrode tab (21), and the welded portion is configured as a plurality and is spaced apart along the radial direction of the current collector disk (13).

12. The battery (1) according to claim 9 or 10, wherein the pressure release grooves (131) are configured in a plurality so as to surround the central axis of the current collector disk (13) and are arranged at intervals in the circumferential direction of the central axis of the current collector disk (13).

13. The battery (1) according to claim 12, wherein the pressure release groove (131) is configured as two, arranged symmetrically on the current collector disk (13), and the second groove portion (1312) of one of the pressure release grooves (131) and the second groove portion (1312) of the other pressure release groove (131) extend radially away from each other.

14. The battery (1) according to claim 9 or 10, wherein the surface of the first projection (141) toward the electrode tab (21) is formed to have a frosted surface.

15. The battery (1) according to claim 12, wherein a contact surface (135) is formed on the current collector disk (13) between two adjacent pressure release grooves (131), and a plurality of second protrusions (142) are formed on the side of the cover plate (12) facing the current collector disk (13), and the second protrusions (142) are adapted to contact the corresponding contact surface (135).

16. The battery (1) according to any one of claims 1 to 15, further comprising an explosion-proof valve (16) disposed in an explosion-proof valve mounting hole (121) on the cover plate (12), welded to the cover plate (12), and adapted to open the explosion-proof valve mounting hole (121) after the pressure in the pressure release cavity reaches a preset pressure, and having a thickness thinner than the thickness of the cover plate (12).

17. A battery assembly (1000) comprising a battery (1) according to any one of claims 1 to 16.

18. A power device (10000) comprising a battery (1) according to any one of claims 1 to 16.

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