Taking 18650 lithium- ion battery as the object, the batteries thermal runaway and inhibition effects of additive water mist on battery thermal runaway were studied. The results show that the more the battery cycles, the shorter the trigger time of thermal runaway; Under the experimental conditions, the starting temperature of battery thermal runaway is about 250 ℃, and the duration of battery thermal runaway is the longest after 20 cycles. Different pressure water mist has obvious inhibitory effect on battery thermal runaway, among which 0.25 MPa pressure water mist has the best inhibitory effect. The addition of 1.0% sodium chloride, 1.5% SDBS and 0.5% protein can not only enhance the inhibition of water mist on the flame of battery, but also improve the inhibition of water mist on the surface temperature of thermal runaway battery to a certain extent.

water mist, additive, aged lithium-ion batteries, inhibition, thermal runaway