内嵌微柱群的渐扩液冷板电池热管理性能研究

Battery thermal management performance study of enlarged outlet liquid cold plate with embedded micro pin fins

为降低锂离子电池最高温度、提高模组整体温度均匀性,提出了一种内嵌微柱群的渐扩液冷板(微柱群-渐扩液冷板)耦合相变材料冷却的新型电池热管理系统。基于Bernardi电池产热模型和能量、动量守恒方程建立了热管理系统的流动传热耦合数值模型,研究了该耦合冷却系统的冷却能力、均温性能和压降特性,并同传统平直液冷板、渐扩液冷板耦合冷却系统的冷却性能进行了对比。结果表明:当入口质量流量为0.16 g/s,电池以6 C放电倍率放电结束时,微柱群-渐扩液冷板与平直液冷板、渐扩液冷板冷却系统相比电池最高温度降低了1.51和0.24 K;最大温差降低了1.75和0.35 K,降幅可达40%和12%;模组内电池温度标准差降低了27%和43%。当维持电池最高温度不高于设定的目标温度310 K时,微柱群-渐扩液冷板与渐扩液冷板相比压降降低了8.4%。

To reduce the maximum temperature of the lithium-ion battery module and improve the temperature uniformity,a novel type of composite battery thermal management system with enlarged outlet liquid cold plate with embedded micro pin fins(EOPF liquid cold plate)and phase change material(PCM)was proposed.Based on the Bernardi battery heat generation model and the conservation equations of energy and momentum,the fluid flow and heat transfer coupling numerical model for battery thermal management system was established.The cooling capacity,temperature uniformity and pressure drop of the proposed cooling scheme were studied,and compared with the composite cooling system with enlarged outlet cold plate and traditional straight cold plate.The results show that when the inlet mass flow is 0.16 g/s and the battery discharge ends at the rate of 6 C,the maximum temperature of the composite system with EOPF liquid cold plate is reduced by 1.51 K and 1.24 K than that the straight cold plate and enlarged outlet cold plate.The maximum temperature difference is decreased by 1.75 K and 0.35 K,reduced by 40%and 12%,respectively.The temperature standard deviations of the batteries in the module are reduced by 27%and 43%,respectively.When maintaining the battery operating temperature below the specified value of 310 K,the minimum pressure drop through the EOPF liquid cold plate is reduced by 8.4%compared with the enlarged outlet cold plate.