Square battery and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a square battery and a battery device, the square battery comprises a shell structure, the shell structure comprises steel, the shell structure comprises a first wall surface, the wall thickness of the first wall surface is d, the area surrounded by the circumferential outer edge of the first wall surface is A, and d is less than or equal to 0.4 mm; the insulating film is arranged on the outer surface of the shell structure and covers a part of the first wall surface, an opening is formed in the insulating film and is opposite to the first wall section, so that an exposed area which is not covered by the insulating film is formed on the first wall surface, the area of the exposed area is a, and (a / A) * d is 0.01 mm-0. 35 mm, and therefore when the wall thickness of the first wall surface is relatively small, the thickness of the first wall surface is smaller, the thickness of the first wall surface is smaller, and the thickness of the second wall surface is smaller. The risk of overall deformation of the shell structure is reduced by regulating and controlling the area proportion of the exposed region, and the heat dissipation capability of the shell structure can be prevented from being greatly influenced, so that the safe use performance of the square battery is reliably improved.

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