Experimental study on inhibition of thermal runaway propagation of lithium battery pack by water mist with different additives
Taking 18650 ternary lithium battery as the research ob-ject,this paper explores the characteristics of thermal runaway propagation of lithium battery,and then studies the effect and mechanism of inhibition of thermal runaway propagation by apply-ing different types of additive water mist at different disaster times.The results show that the propagation of thermal runaway in the triangle-arranged battery module can be divided into three characteristic moments:thermal runaway initiation,thermal run-away peer layer propagation and thermal runaway interlayer propagation.Due to the preheating effect of the upper layer,the thermal runaway peer layer propagation is faster than the inter-layer propagation.At different disaster times,pure water mist,1%CAB-35 water mist and 4%APG0810 water mist were ap-plied respectively.It was found that the effect of water mist on re-straining thermal runaway propagation of lithium battery was con-sistent with its cooling effect on single target battery.4%APG0810 water mist can significantly reduce the maximum ther-mal runaway temperature of the target battery,and has the best effect on inhibiting thermal runaway propagation,which can in-hibit thermal runaway propagation in the same layer and between layers.1%CAB-35 water mist and pure water mist with no obvi-ous thermal runaway cooling can inhibit the thermal runaway propagation between layers,but can not inhibit the thermal run-away propagation in the same layer.Through the solution perfor-mance test of different additives,it was found that the inhibition ability of 4%APG0810 water mist was significantly better than the other two,because 4%APG0810 has the lowest surface ten-sion and contact angle,and its foaming property and foam stabil-ity are also the best.The combined effect of these effects im-proves the inhibition effect of thermal runaway propagation.
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