A novel liquid cooling device for a prismatic LiFePO4 battery module was proposed and manufactured in this study in order to improve the thermal management performance of the battery module operating at high ambient t...A novel liquid cooling device for a prismatic LiFePO4 battery module was proposed and manufactured in this study in order to improve the thermal management performance of the battery module operating at high ambient temperature.A testing system was set up to experimentally measure temperatures in different locations of the battery module consisting of seven 60 Ah cells.Tests were conducted to investigate both the passive and active cooling performances of the proposed system at different ambient temperatures and discharging rates in regarding with the maximum temperature and difference between the maximum and minimum temperatures.The results clearly show that both the ambient temperature and discharging rate play important role on the maximum temperature of the battery module.Passive cooling cannot meet the cooling requirement of the battery module particularly at high ambient temperature of 40℃.In contrary,liquid cooling can successfully reduce the maximum temperature to the required temperature range of the battery module even in high temperature environment and relatively high discharging rate.The effect of water inlet temperature on the cooling performance was also experimentally studied.With the inlet temperature of 28℃,the active cooling device can reduce the maximum temperature of the battery module to about 34.8℃after discharging at 0.6℃for 1000 s.The temperature difference of only 3.8℃was also achieved which suggests a great uniform distribution of temperature in the battery module.展开更多
The operating conditions greatly affect the electrolysis performance and temperature distribution of solid oxide electrolysis cells(SOECs).However,the temperature distribution in a cell is hard to determine by experim...The operating conditions greatly affect the electrolysis performance and temperature distribution of solid oxide electrolysis cells(SOECs).However,the temperature distribution in a cell is hard to determine by experiments due to the limitations of in-situ measurement methods.In this study,an electrochemical-flow-thermal coupling numerical cell model is established and verified by both current-voltage curves and electrochemical impedance spectroscopy(EIS)results.The electrolysis performance and temperature distribution under different working conditions are numerically analyzed,including operating temperature,steam and hydrogen partial pressures in the fuel gas,inlet flow rate and inlet temperature of fuel gas.The results show that the electrolysis performance improves with increasing operating temperature.Increasing steam partial pressure improves electrolysis performance and temperature distribution uniformity,but decreases steam conversion rate.An inappropriately low hydrogen partial pressure reduces the diffusion ability of fuel gas mixture and increases concentration impedance.Although increasing the flow rate of fuel gas improves electrolysis performance,it also reduces temperature distribution uniformity.A lower airflow rate benefits temperature distribution uniformity.The inlet temperature of fuel gas has little influence on electrolysis performance.In order to obtain a more uniform temperature distribution,it is more important to preheat the air than the fuel gas.展开更多
基金the National Key R&D Program of China(Grant No.2018YFB1502600)National Natural Science Foundation of China(Grant No.11932005)。
文摘A novel liquid cooling device for a prismatic LiFePO4 battery module was proposed and manufactured in this study in order to improve the thermal management performance of the battery module operating at high ambient temperature.A testing system was set up to experimentally measure temperatures in different locations of the battery module consisting of seven 60 Ah cells.Tests were conducted to investigate both the passive and active cooling performances of the proposed system at different ambient temperatures and discharging rates in regarding with the maximum temperature and difference between the maximum and minimum temperatures.The results clearly show that both the ambient temperature and discharging rate play important role on the maximum temperature of the battery module.Passive cooling cannot meet the cooling requirement of the battery module particularly at high ambient temperature of 40℃.In contrary,liquid cooling can successfully reduce the maximum temperature to the required temperature range of the battery module even in high temperature environment and relatively high discharging rate.The effect of water inlet temperature on the cooling performance was also experimentally studied.With the inlet temperature of 28℃,the active cooling device can reduce the maximum temperature of the battery module to about 34.8℃after discharging at 0.6℃for 1000 s.The temperature difference of only 3.8℃was also achieved which suggests a great uniform distribution of temperature in the battery module.
基金This work was financially supported by National Natural Science Foundation of China(52176182)Shenzhen Science and Technology Innovation Commission(GXWD20220811164142001,JCYJ20200109113439837)the Innovation Program in Universities and Colleges in Guangdong(2022KTSCX212).
文摘The operating conditions greatly affect the electrolysis performance and temperature distribution of solid oxide electrolysis cells(SOECs).However,the temperature distribution in a cell is hard to determine by experiments due to the limitations of in-situ measurement methods.In this study,an electrochemical-flow-thermal coupling numerical cell model is established and verified by both current-voltage curves and electrochemical impedance spectroscopy(EIS)results.The electrolysis performance and temperature distribution under different working conditions are numerically analyzed,including operating temperature,steam and hydrogen partial pressures in the fuel gas,inlet flow rate and inlet temperature of fuel gas.The results show that the electrolysis performance improves with increasing operating temperature.Increasing steam partial pressure improves electrolysis performance and temperature distribution uniformity,but decreases steam conversion rate.An inappropriately low hydrogen partial pressure reduces the diffusion ability of fuel gas mixture and increases concentration impedance.Although increasing the flow rate of fuel gas improves electrolysis performance,it also reduces temperature distribution uniformity.A lower airflow rate benefits temperature distribution uniformity.The inlet temperature of fuel gas has little influence on electrolysis performance.In order to obtain a more uniform temperature distribution,it is more important to preheat the air than the fuel gas.
