Experimental Investigation on Immersion Liquid Cooled Battery Thermal Management System with Phase Change Epoxy Sealant

Abstract

To improve the working performance of the lithium-ion battery pack in continuous operation under water or moisture conditions, a novel immersion liquid cooled battery thermal management system (BTMS) with epoxy sealant based composite phase change (ESPE) is designed for power lithium-ion batteries. Considering the traditional liquid cooling systems with complex auxiliary equipment, the novel BTMS exhibits an excellent cooling effectiveness and displays long-term corrosion resistance performance. The thermal performances of epoxy sealant (ES) with or without the addition of paraffin, expanded graphite are compared, respectively. Besides, the temperature control and temperature average performance of the three different battery modules are analyzed in detail, including the ESPE-Block Module, ESPE Module, and ESPE-Immersed Module. The experimental results indicate that ESPE exhibits excellent waterproof and thermal management performance. The paraffin and expanded graphite can absorb heat from the battery quickly and balance the temperature. Even during 3C charge and discharge cycle, the maximum temperature and the maximum temperature difference can be maintained at 42°C and 2°C, respectively. With these prominent performances, the designed BTMS with respect to excellent waterproof and prominent thermal management performances can significantly reduce the unnecessary power consumption of liquid cooling and provide insights into the passive BTMS.

Keywords: Battery thermal management system, Epoxy sealant, phase change material, thermal performance, Immersion cooling system