Battery box

The utility model provides a battery box. This battery box has a box body that is used for holding the electrode body, and this box body possesses and extends on length direction and in opposite directions and right a pair of first curb plate, extend on width direction and in opposite directions and right a pair of second curb plate, and the bottom plate of connection at the lower extreme of first curb plate and second curb plate, the internal face in the first bight that first curb plate is connected with the bottom plate is the arc, if the thick size of the board of first curb plate and second curb plate is t, then the thick size of the board at the thickest position in first bight is set for at more than or equal to preset's lower limit value and is less than 3.9t's within range, the internal face in the second bight that first curb plate is connected with the second curb plate is the arc, the thick size of board at the thickest position in this second bight is set for the within range at the upper limit v