Preparation of a novel composite phase change material (PCM) and its locally enhanced heat transfer for power battery module

•Locally enhanced heat transfer for power battery module was presented.•A novel CPCM was prepared by loading graphene, carbon tube and expanded graphite into paraffin.•The locally enhanced heat transfer effect of the CPCM was almost the same as copper foam/PCM.•Temperature of the battery module was more uniform when the enhanced region was narrowed.