Hydrated salt phase change composite used in thermal management of Li-ion battery
The performance of Li-ion battery is very sensitive to temperature.The requirements for battery thermal management are increasing because the temperature changes greatly at high discharge rates.In order to control the maximum temperature and temperature uniformity of batteries,the hydrated salt phase change materials are prepared.The phase change materials are consisted of sodium acetate trihydrate,glycine,disodium phosphate dodecanate hydrate eutectic hydrate salts and expanded graphite.The material has suitable phase change temperature(45.31 ℃)and high enthalpy(196.17 J/g)when 5.0％expanded graphite is added,which possesses high thermal conductivity of 1.60 W/(m·K)and well anti-leakage performance.At room temperature(25 ℃),when the discharge rate is 2 C,the maximum temperature difference of single battery is 0.21 ℃,the maximum temperature of battery pack within 55 ℃.The maximum temperature difference in battery module is 2.41 ℃ under phase change cooling,which is 89.55％,22.24％and 77.46％lower than that of air cooling,respectively.Compared with air cooling,phase change cooling can improve the temperature uniformity of the battery pack at high rate of discharge and make it in a suitable temperature range.
hydrated salt phase change materialLi-ion batterythermal managementthermal conductivity
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