Battery case

The utility model provides a battery box. The battery box is provided with a tetragonal containing part with an open upper end and four flat parts integrally formed on the periphery of the open end ofthe containing part, in the four flat parts, the first flat part, the second flat part and the third flat part extend perpendicular to the longitudinal wall of the containing part, and the fourth flat part is formed. Wherein the fourth flat part extends along the extending direction of the longitudinal wall of the accommodating part by a specified length and then extends perpendicular to the longitudinal wall of the accommodating part to form a right-angle part, and the fourth flat part is folded to the second flat part side opposite to the fourth flat part from a position higher than the endedge of the open end by a specified size to cover the open end in a state that the all-solid-state battery is accommodated in the accommodating part. In the state, the right-angle part on the fourthflat part is pulled to be i