Heat dissipation performance of lithium battery at high temperature based on CPCM liquid cooling fin coupling

DOI:	10.11809/bqzbgcxb2024.04.010
Keywords:	lithium power battery pack; numerical simulation; phase change material; coupled heat dissipation; performance analysis
Abstract:	A new type of composite phase change material (CPCM)/liquid cooling/fin coupled cooling system was designed to address the issue of excessive operating temperature or temperature gradient leading to reduced capacity and lifespan of lithium ion battery packs.Through numerical simulation, the effects of coolant flow direction, the percentage of expanded graphite (EG) in paraffin wax and the velocity of coolant on the heat dissipation performance of the system were analyzed under high temperature environment (38 ℃) and high rate cycle charging and discharging. The results show that the maximum temperature of the battery pack is further reduced by 35.74 ℃ after the introduction of liquid cooling and heat fin on the basis of the PCM cooling. Compared with the same flow cooling of the battery pack, the maximum temperature and maximum temperature difference decreased by 1.66 ℃ and 3.15 ℃, respectively, and the temperature distribution of the battery is more uniform. The heat dissipation performance of the system has been significantly improved after the addition of EG in paraffin wax, and the heat dissipation performance is the best when the percentage of EG is 6%.When the coolant flow rate increases from 0.10 m/s to 0.20 m/s, the maximum temperature and maximum temperature difference of the battery pack decrease by 2.68 ℃ and 2.22 ℃ respectively. As the flow rate continues to increase, the heat dissipation performance is not significantly improved.
Issue:	Vol. 45 No. 4 (2024)
Published:	2024-04-30
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