Power battery device

The invention discloses a power battery device. The power battery device comprises a closed shell, an air supply device and an inhibitor bottle, wherein the air supply device comprises a high-pressure air cylinder, a pressure reduction assembly, a one-way balance valve and an air supply pipeline which is sequentially communicated with the high-pressure air cylinder, the pressure reduction assembly, the one-way balance valve and the closed shell. The high-pressure air cylinder is filled with protective air, the one-way balance valve allows the protective air to enter the closed shell, and balance is achieved under the action of the one-way balance valve. Once the protective air in the closed shell leaks, the protective air in the high-pressure air cylinder can be immediately supplemented into the closed shell, so that the atmosphere of the protective air is always maintained in the closed shell. And the protective air can effectively isolate air, so that necessary conditions for combustion are blocked. Therefo