During the swift expansion of lithium ion battery (LIB) applications, safety usage and longer cycle life are the main point that researchers put emphasis on. It is well known that the temperature is the sensitive parameters to LIBs. Herein, thermal management plays a vital role in battery module (BM) applications. Phase change material (PCM) has thought to be the great medium for battery module due to enormous latent heat while phase changing. It can make temperature evenly distribution inside the BM which is positive for extending life of LIBs. However, drawbacks of combustible and inferior thermal conductivity restrict PCM applies in BM. In this research, two types of flame retardant, quencher and intumescent flame retardant, were added into paraffin (PA) to form a composite PCM. Moreover, 10 mass% epoxy resin was also added to achieve higher mechanical strength. Several experiments were performed to distinguish the composite PCM, such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dripping test, thermal conductivity, and mechanical strength test. The TGA results showed that expanding graphite (EG) can slightly shift the degradation curve, furthermore, the PCM with magnesium hydroxide (MH) possessed higher degradation temperature. The results from vertical burning test revealed the great resistance to fire while mixed with PA, EG, and MH. In the last, DSC test proved that the latent heat would not prominently be changed by modification.
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