A hybrid battery thermal management system coupling with PCM and optimized thermoelectric cooling for high-rate discharge condition

The lithium-ion battery is now abundantly available in the market due to its excellent perfor-mance. However, battery overheating is increasingly prominent when the battery discharges at high speed. In this study, an active-passive BTMS (Battery Thermal Management System) combining PCM (Phase Change Material) and TEC (Thermoelectric Cooler) was proposed. The effects of different TEC currents and delayed cooling at different PCM melting rates were analyzed under the 4C discharge condition to enhance the thermal performance. The results demonstrate that battery temperature gets effectively controlled as the TEC current increases, but the tem-perature difference and PCM utilization are poor. However, applying a delayed current after the PCM melting rate reaches 80% reduces energy consumption and provides better temperature uniformity. Considering the large battery heat under 4C discharge, combined with the transient supercooling effect of TEC, a continuous pulse current was used to provide additional cooling power. Results show that the battery with TEC pulsed current operates 57.8% longer at 40 degrees C with a temperature difference maintained at 2.5 K under 4C discharge conditions compared with the PCM model.

Automated summary

In this study, an active-passive Battery Thermal Management System (BTMS) combining Phase Change Material (PCM) and Thermoelectric Cooler (TEC) was proposed to enhance the thermal performance of lithium-ion batteries. The effects of different TEC currents and delayed cooling at different PCM melting rates were analyzed under the 4C discharge condition. The results showed that increasing the TEC current effectively controlled the battery temperature, but resulted in poor temperature difference and PCM utilization. However, applying a delayed current after the PCM melting rate reached 80% reduced energy consumption and provided better temperature uniformity. A continuous pulse current with TEC was used to provide additional cooling power, resulting in 57.8% longer operation time at 40 degrees C with a temperature difference of 2.5 K compared to the PCM model under 4C discharge conditions.