Research on heat dissipation characteristics of power battery with methanol-water binary working medium thermosiphon containing GNs
High operating temperature and large temperature difference of power battery will cause its performance to decline rapidly.For an effective battery thermal management system(BTMS),the maximum temperature and the surface temperature difference of power battery module should be controlled in the allowable range.With the scale and modularization of power batteries,the thermal safety problem is becoming more and more prominent,and it is urgent to develop more advanced and efficient BTMS.In this work,based on the research results of heat transfer characteristics of methanol-water binary working medium thermosiphon containing graphene nanoparticles(GNs),the experimental test system of battery thermal management was constructed with methanol-water binary working medium thermosiphon with filling rate of 50％and GNs concentration of 0.02wt％.The heat dissipation of power battery pack was researched under three discharge rate conditions of 1,1.5,and 2 C,and were compared with natural cooling and forced air cooling results.The study results showed that,for methanol-water binary working medium thermosiphon containing GNs cooling system,the maximum battery temperature corresponding to discharge rates of 1,1.5,and 2 C were 28.89,32.12,and 35.76℃,respectively.Meanwhile,the average temperature rise rate of power battery pack was the lowest,which was only 0.525 ℃/min at 2 C discharge rate.In addition,at 2 C discharge rate,the power battery temperature of methanol-water binary working medium thermosiphon containing GNs cooling system decreased by 22.48％and 49.13％compared with forced air-cooling system and natural cooling,respectively.The heat dissipation efficiency of the methanol-water binary working medium thermosiphon containing GNs cooling system was the highest under three kinds of discharge rates,and all of them were more than 70％.The research results can provide theoretical basis and data support for the application of heat pipe cooling system in power battery thermal management system.
thermosiphonbinary working mediumgraphenebattery thermal management system
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