Publication: Effect of liquid cooling on performance of lithium ion battery
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Date
2023-07-23
Authors
Aaron Aloysius a/l Charles
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Abstract
This research studies the effect on static immersion cooling (SIC) on performance of lithium ion battery that has 22.2V and 5200mAh. An acrylic tank containing a dielectric fluid (mineral oil) which is a non-conductive liquid components, is used to submerge the Li-ion battery . A DC loader acts as a discharger to provide load current for the 1C and 3C discharge rates.The effect of discharge rate on battery setting temperature will be measured in natural convection(NC) for 1C,2C and 3C to obtain the worst case scenario.From the experiment,as the discharge rate increases ,the heat gain increases significantly linearly .The submerge levels of immersion cooling is analyzed where the mineral oil is filled up to height of 7cm(partial) and 12cm(full). Then, the temperature of battery and mineral oil in SIC is measured by thermocouples. By comparing data from SIC and natural convection condition,the results shows that ,temperature of Li-ion battery in SIC condition is lower than NC environment. The results also showed that NC for 3C and 1C has the highest temperature difference which is 10.596℃ and 7.73℃ among all whereas for PIC for 3C and 1C is 10.434℃ and 7.316℃. Hence,in PIC is slightly lower than NC. Lastly ,the heat gain for the mineral oil due to heat transfer between Li-ion battery is compared and analyzed. From calculation, when 3C full immersion cooling (FIC ) and PIC ,the heat gain is 6.927KJ and 4.667KJ whereas for 1C FIC and PIC is 1.9071KJ and 1.8216KJ.In conclusion,volume of mineral oil is significant for an efficient heat transfer.