DXJL3072/220J mining flameproof and intrinsically safe lithium-ion battery power supply is suitable for use in underground coal mines where there is a risk of gas and coal dust explosions. The power supply has a built-in backup battery and an AC uninterruptible power supply circuit, which can provide both AC220V and AC127V AC outputs as well as DC110V DC output in the event of AC power failure, effectively improving the reliability of the downstream powered equipment.