Battery and electric device

The utility model provides a battery and an electric device. The battery comprises a box body, a battery monomer and a detection device, the box body is provided with an accommodating cavity; the battery monomer is arranged in the accommodating cavity, the battery monomer comprises a shell and a pressure relief mechanism, the shell is provided with a first wall, and the pressure relief mechanism is arranged on the first wall of the shell; the detection device is arranged in the containing cavity, located between the first wall and the box body and used for detecting whether the pressure relief mechanism is started or not. According to the battery provided by the invention, the opening of the pressure relief mechanism can be detected more timely and accurately through the detection device, so that the battery can be controlled to take measures such as power failure and cooling in time, further spreading of thermal runaway in the battery can be reduced, and the reliability of the battery can be improved.