Heat-conducting and insulating composite phase-change material, preparation method and battery module applying heat-conducting and insulating composite phase-change material

The embodiment of the invention discloses a heat-conducting and insulating composite phase change material, a preparation method and a battery module applying the heat-conducting and insulating composite phase change material, and the composite phase change material comprises the following components in percentage by mass: 60-75% of paraffin, 2-5% of expanded graphite, 15-30% of boron nitride and 2-5% of polystyrene-polyethylene-polybutylene-polystyrene. Or comprises the following components: 60-75% of paraffin, 3-6% of carbon nanotube, 15-35% of boron nitride, 2-5% of polystyrene-polyethylene-polybutylene-polystyrene, and 2% of PVP dispersant. Or comprises the following components in percentage by weight: 60-75% of paraffin, 10-15% of graphene, 15-25% of boron nitride, 2-5% of polystyrene-polyethylene-polybutylene-polystyrene and 2% of PVP dispersing agent. The melting point range of the novel composite phase change heat absorption material can be further adjusted to meet the requirements of different batter