BATTERY

The present invention provides a battery, comprising a case, a cell packaged in the case, an electrical terminal located at one end of the case and electrically connected to the cell, a safety device and a current cut-off device. The safety device comprises a first electrode and a second electrode arranged spaced apart from each other and respectively electrically connected to a positive electrode or a negative electrode. The first electrode and the second electrode are arranged spaced apart from each other and form an electric field, and a gas generating material capable of generating an inert gas when a voltage reaches or exceeds a threshold value is provided in the electric field. The current cut-off device is electrically connected between the cell and the electrical terminal and is capable of causing a brake of circuit in response to a pressure difference between the inside and the outside of the battery caused by the inert gas. According to the present invention, the safety device has a high gas generation rate, and the gas may escape directly into an internal space of the battery, thereby increasing a reaction rate. The energy density and the power density of electrode plates are increased, while the risk of introducing metallic foreign bodies can be reduced, with less negative impact on the design and the electrochemical performance of the cell.