Evaluation on thermal performance of liquid‐cooling structures for high‐power lithium‐ion battery pack

Abstract

Developing high-power electric-driven system is the key to realize green exploration of vibroseis. To improve the safety and extend the cycle life of the lithium-ion batteries for electric-driven vibroseis, two types of liquid-cooling structure for the battery pack were developed and evaluated. The thermal performance of the liquid-cooling structures was evaluated by three indexes of the maximum temperature in the whole battery pack, the maximum temperature difference between the cells, and the standard deviation (SD) coefficient of the cells' temperature. Results suggest that the maximum temperature difference and the SD coefficient of the single-inlet-single-outlet liquid-cooling structure is 7.43°C and 6.49%, respectively, and both fail to meet the indexes. In the double-inlet-double-outlet liquid-cooling structure, the maximum temperature increases linearly with the growth of the coolant inlet temperature. With higher coolant flow rate, the maximum temperature is lower, while the temperature difference between the two sides of the cell is greater. When the inlet temperature of the coolant is below 33.9°C and the coolant flow rate is greater than or equal to 350 g/s, the thermal performance evaluation indexes of the battery pack could be achieved. Field test of the electric-driven vibroseis shows that the double-inlet-double-outlet structure can fully achieve the cooling requirements. This research provides significant support for the development of green-exploration vibroseis.