A Flameproof Type Ni-MH Battery Power Control Box

In the article, a flame-proof type ni-mh battery power control box was designed for continuous standby power of coal mine safety monitoring equipments. Under normal circumstances, power control box charged ni-mh battery, and it could instantly and automatically switch to ni-nh power supply as power supply failure, which ensured coal mine safety monitoring equipment 24 h uninterrupted operation.