锂离子动力电池的三维热模型
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摘要
研究了圆柱形、方形和软包三种不同结构设计以及放电倍率和换热系数对锂离子动力电池温度场分布的影响。结果表明,电池正极极柱和边缘温度最低的结构设计是软包,其次是圆柱形,温度最高的是方形;随着放电倍率的增大,电池各部分的温度均不断增大,放电倍率越大,温升速率越快,尤其是在大倍率放电情况下,温度几乎呈直线增加;增大对流换热系数,电池最高温度处(铝极耳)温度逐渐下降,中心处温度变化更为明显,但增大对流换热并不能无限制地降低电池温度。
The influences of three different structure designs(cylinder, square, soft pack), discharge rate and heat transfer coefficient on temperature distribution of lithium ion battery were studied. The results show that the temperature of battery cathode pole and edge with soft pack structure is the lowest, the temperature of the cylinder structure is higher, and the temperature of the square structure is the highest. With the increase of discharge rate, the temperature of battery gradually increases, and the higher the discharge rate is, the faster the temperature rises,especially at high discharge rate. With the increase of heat transfer coefficient, the highest temperature of battery(Al tabs) gradually decreases, and the temperature change in center of battery is more obvious. But the effect of heat transfer coefficient is not unlimited.
The influences of three different structure designs(cylinder, square, soft pack), discharge rate and heat transfer coefficient on temperature distribution of lithium ion battery were studied. The results show that the temperature of battery cathode pole and edge with soft pack structure is the lowest, the temperature of the cylinder structure is higher, and the temperature of the square structure is the highest. With the increase of discharge rate, the temperature of battery gradually increases, and the higher the discharge rate is, the faster the temperature rises,especially at high discharge rate. With the increase of heat transfer coefficient, the highest temperature of battery(Al tabs) gradually decreases, and the temperature change in center of battery is more obvious. But the effect of heat transfer coefficient is not unlimited.
引文
[1]张凯,汤依伟,邹忠,等.锂离子蓄电池Li Mn2O4/石墨电极放电过程中扩散极化的仿真[J].中国有色金属学报,2013,23(8):2235-2242.
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[2]汤依伟,贾明,程昀,等.基于电化学与热能的耦合关系演算聚合物锂离子动力电池的温度状态及分布[J].物理学报,2013,62(15):158201.
[3]BERNARDI D,PAWIIKOWSKI E,NEWMAN J.A general energy balance for battery systems[J].Electrochem Soc,1985,132(1):5-12.
[4]HALLAJ S A,SELMAN J R.Thermal modeling of secondary lithium batteries for electric vehicle/hybrid electric vehicle applications[J].Journal of Power Sources,2002,110:341-348.
[5]WU M S,LIU K H,WANG Y Y,et a.Heat dissipation design for lithium ion batteries[J].Journal of Power Sources,2002,109:160-166.
[6]VLAHINOS A,PESARAN A A.Energy efficient battery heating in cold climates[C]//Future Car Congress.US:SAE,2002:1975-1982.
[7]CHEN S C,WANG C C.Thermal analysis of 1ithium ion batteries[J].Journal of Power Sources,2005,140:111-124.