Review on the heat dissipation performance of battery pack with different structures and operation conditions

This paper reviews the heat dissipation performance of battery pack with different structures (including: longitudinal battery pack, horizontal battery pack, and changing the position of air-inlet and air-outlet) and operation conditions (including: SOC state, charge and discharge rate, and practical operation condition), and finally arrives at the conclusions as follows: the average thermal power of 55 Ah lithium-ion battery monomer decreases along with environment temperature rising, SOC state decreasing and charge and discharge rate falling; the maximum temperature rising and temperature difference of battery pack are not only relevant to the flow rate, but also related to the airflow duct structure, the battery pack with air-inlets on both sides is more conducive to the forced air cooling; the flow rate of battery pack at 70% SOC state is maximum, the maximum temperature rising and temperature difference of battery pack at 70% SOC state are minimum, and that of 90% SOC state are maximum; the flow rate and the average pressure drop between air-inlet and air-outlet both decrease along with charge and discharge rate increasing, but the maximum temperature rising and temperature difference of battery pack increase; as considering the practical operation condition of battery pack, the charge and discharge rate is between 0.5 C and 0.8 C, and the maximum temperature rising and maximum temperature difference of battery pack are 7.61 °C and 4.29 °C. Then the reference basis for heat flow field characteristic analysis and structure design of battery pack are offered.