Experimental investigation on a novel liquid cooling device for a prismatic Li-ion battery module operating at high ambi
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perimental investigation on a novel liquid cooling device for a prismatic Li-ion battery module operating at high ambient temperature XU JiaWei, ZHOU TianShu & XU XinHai
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School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China Received March 4, 2020; accepted April 16, 2020; published online June 12, 2020
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°C. 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°C, the active cooling device can reduce the maximum temperature of the battery module to about 34.8°C after discharging at 0.6°C for 1000 s. The temperature difference of only 3.8°C was also achieved which suggests a great uniform distribution of temperature in the battery module. liquid cooling, maximum temperature, temperature difference, Li-ion battery, cold plate, thermal management Citation:
Xu J W, Zhou T S, Xu X H. Experimental investigation on a novel liquid cooling device for a prismatic Li-ion battery module operating at high ambient temperature. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-020-1605-5
1 Introduction Compared to internal combustion engine vehicles, electric vehicles (EVs) have attracted much attention recently due to advantages of none carbon dioxide emission and fossil fuel consumption. The Li-ion battery has been considered as the major battery technology because of its high energy density, long cycle life, and low self-discharge rate [1]. During operation of the Li-ion batteries, a large amount of heat is generated as a result of polarization, electrochemical reactions, and internal resistance [1,2]. Excessive heat needs to *Corresponding author (email: [email protected])
be effectively dissipated to the ambient, because high temperature can lead to battery thermal instability and cause degradation [3] or even damage as a result of exponentially increased electrochemical reactions [4,5].
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