Polyethylene glycol based phase change materials for battery thermal management
The problem of thermal disasters of the Li-ion battery caused by unsuitable temperatures has not been solved.Effective battery thermal management technology is particularly important.Composite phase change materials are prepared by melt-blending method using polyethylene glycol and expanded graphite as raw materials,their thermal physical properties and battery thermal management performance are studied.As the addition of expanded graphite increases,the melting point and enthalpy of phase change materials decrease,while the thermal conductivity increases.When the mass ratio of expanded graphite is 10%,the melting point,enthalpy and thermal conductivity are respectively 46.8℃,116.6 J/g and 1.379 W/(m·K).Phase change material cooling can well control the temperature of the batteries.At a discharge rate of 2.0 C,compared with the forced air cooling at a speed of 2.3 m/s,the maximum temperatures of single battery and battery pack are respectively decreased by 7.15℃and 10.98℃.
万方数据
维普
