摘要
电池冷却机组性能的优异对于动力电池在整车上安全、高效、可靠运行至关重要。基于制冷剂直接冷却的方式,本文设计并研制了一套8 kW动力电池冷却机组,并在某纯电动重卡上进行了实验验证及装车验证。结果表明:当电池底部的冷板表面温度在5～10℃时,电池芯体的最高温度能够降到35℃以下;采用双压缩机联合制冷方式,机组制冷性能达7.8 kW;采用分液头加毛细管的分液方式能够保证15块电池冷板进出口温差维持在5℃以内;通过循环充放电实验,在0.8C倍率充电、1C倍率放电的条件下,电芯温度皆可在40℃以下;在外界高温环境下,该机组能够在20 min内将电池芯体的平均温度降至28℃左右;此外,分析了制冷剂充注量、H型热力膨胀阀开度等因素对机组性能的影响,制定了机组的控制策略并加以评估。
The performance of the battery cooling unit is critical to the safe,efficient,and reliable operation of the power battery in a vehicle.Based on the process of refrigerant direct cooling,an 8 kW power battery cooling unit for use in a pure electric truck was designed and developed.The performance of this unit was tested in both a lab and the truck itself.The results showed that if the temperature of the cooling plate located at the bottom of the battery was between 5 and 10℃,the highest temperature in the battery core could be reduced to 35℃.In addition,the refrigeration capacity could reach 7.8 kW with dual compressor cooling system.The temperature difference between the inlets and outlets of 15 cooling plates was less than 5℃when the distributor and capillary were combined.In a high-temperature environment,the vehicle battery cooling unit used in the truck could maintain an average battery-core temperature of less than 28℃.Different inlet temperatures of cooling plates could be controlled within a range of 7-10℃,whereas the outlet temperature could be controlled within 9-13℃,which is very effective for the cooling of battery.In addition,the influence of refrigerant charge and the opening degree of the H-type thermal expansion valve on the performance of the unit were analyzed,and the control strategy of the unit was formulated and evaluated.
作者
何贤
邓冬
苏健
沙海建
胡静
He Xian;Deng Dong;Su Jian;Sha Haijian;Hu Jing(Dun'an Automotive Thermal Management Technology Co.,Ltd.,Shaoxing,312000,China;Du'nan Environmental Technology Co.,Ltd.,Hangzhou,310000,China;Zhejiang Dunan Electro-Mechanical Technology Co.,Ltd.,Shaoxing,312000,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2019年第2期20-27,共8页
Journal of Refrigeration
关键词
电池冷却
直冷系统
冷板
控制策略
实验研究
battery cooling
direct cooling system
cooling plate
control strategy
experimental research
