基于CPCM-液冷-翅片耦合作用的锂电池高温散热性能研究
Heat dissipation performance of lithium battery at high temperature based on CPCM-liquid cooling-fin coupling
张群 1尚小标 2王文博 1范会丽 1王先锋1
作者信息
- 1. 昆明理工大学 机电工程学院,昆明 650500
- 2. 昆明理工大学 机电工程学院,昆明 650500;非常规冶金教育部重点实验室,昆明 650093;微波能工程应用及装备技术国家地方联合工程实验室,昆明 650093
- 折叠
摘要
针对锂离子电池组工作温度过高或温差过大将导致其容量和寿命降低的问题,设计了一种新型的复合相变材料(CPCM)/液冷/翅片耦合散热系统.通过数值模拟,分析了高温环境(38℃)、高倍率循环充放电时,冷却液流向、石蜡中膨胀石墨(EG)的百分含量及冷却液流速对该系统散热性能的影响.结果表明,在相变材料(PCM)冷却基础上,引入液冷和散热翅片使电池组的最高温度进一步降低了35.74℃.冷却液交错流比同向流冷却电池组的最高温度降低了1.66℃、最大温差降低了3.15℃,电池温度分布更加均匀.在石蜡中添加EG后系统散热性能有明显提升,EG百分含量为6%时散热性能最好.冷却液流速从 0.10 m/s增加到 0.20 m/s时,电池组的最高温度降低了2.68℃、最大温差降低了2.22℃;继续增大流速,散热性能提升不显著.
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.
关键词
锂动力电池组/数值模拟/相变材料/耦合散热/性能分析Key words
lithium power battery pack/numerical simulation/phase change material/coupled heat dissipation/performance analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据