Battery, battery pack, and electric device

Abstract

This invention relates to the field of battery technology and discloses a battery, a battery pack, and an electrical device, comprising: a casing including a shell and a cover plate, wherein at least one end of the shell has an opening, the cover plate and the shell are welded to form a welded area, the shell has a first surface, and the first surface has two first edges spaced apart from each other along its width direction; an explosion-proof valve disposed on the first surface, the explosion-proof valve having a thinning area; the welded area has a weld depth of D1 mm, a weld width of D2 mm, a battery thickness of W mm along the width direction of the first surface, and a distance of L1 mm between the thinning area and the first edges, satisfying W≥35 and 0.72≤L1×D1×D2≤213. This invention ensures that the explosion-proof valve opens preferentially when the battery experiences thermal runaway, achieving timely and directional pressure relief of the battery. Simultaneously, it avoids excessive heat generation during the welding of the shell and cover plate, preventing the insulation from melting, and also avoids damage to the battery cell caused by weld penetration of the cover plate.

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