Battary having a function of cutting-off output power in emergency

A battery having an electric power breaking function in emergency is provided to improve stability by breaking the electric power output inside the battery when sensing dangerous situations. A battery having an electric power breaking function in emergency includes an emergency signal sensing unit(110), a battery power breaking control unit(120), a power breaking switch unit(130), an electric cell unit(140), and an external box(150). The emergency signal sensing unit(110) outputs an emergency signal by inputting an electric leakage sensing signal inputted from an external sensor. The battery power breaking control unit(120) outputs a power switching signal to supply and break electric power when receiving the emergency signal from the emergency signal sensing unit(110). The power breaking switch unit(130) is switched to be opened or shorted according to the power switching signal from the battery power breaking control unit(120). The electric cell unit(140) has an electrode plate terminal connected to the power breaking switch unit(130) for breaking or supplying the output of the electric power. The external box(150) hermetically seals the power breaking switch unit(130) and the electric cell unit(140) and the emergency signal sensing unit(110) and the battery power breaking control unit(120) are installed on the external box(150) as one body.