Thermal management performance of cylindrical power batteries made of graphite paraffin composite phase change materials

doi:10.19799/j.cnki.2095-4239.2020.0206

Abstract

Abstract:

A hexagonal cell module was designed based on the 21700 capacity NCM811 lithium-ion cell, and a cylindrical structure of graphite paraffin composite phase change material was used to cover the battery. The thermal characteristics of the module was investigated using numerical simulations by varying the discharge rate and distance between two adjacent batteries. The results show that the distance between adjacent batteries has a greater influence on the battery temperature for a high rate discharge process compared to a low rate discharge process. At a fixed discharge rate, the temperature rise of the small distance battery modules is higher than that of the middle distance and large distance battery modules. The change of battery temperature lags behind the thermal flow in time. By monitoring the thermal flow, the failure of battery thermal management can be predicted in advance to improve the safety of batteries.

Key words: cylindrical power battery module, graphite paraffin composite phase change material, thermal characteristics

CLC Number:

TM 911

Haimin WANG, Yufei WANG, Feng HU. Thermal management performance of cylindrical power batteries made of graphite paraffin composite phase change materials[J]. Energy Storage Science and Technology, 2021, 10(1): 210-217.

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参数	单位	数值
密度	kg/m³	1000
比热容	J/(kg·K)	2000
导热系数	W/(m·K)	3
动力黏度	Pa·s	0.02
相变温度	℃	35
相变潜热	J/kg	210000

参数	测试工况	备注
环境温度	30 ℃	恒定环境温度
放电倍率	1.0 C、1.5 C、2.0 C、2.5 C	1 C (4.6 A)
放电方式	恒流放电	放电截止电压：2.5 V
充电方式	0.5 C、4.2 V	CC-CV(恒流恒压)/环境温度：30 ℃

参数	单位	数值
密度	kg·m³	2751
比热容	J/(kg·K)	1070
径向导热系数	W/(m·K)	1.15
轴向导热系数	W/(m·K)	23.34

倍率/C	电池生热量Q_b/J
1.5	2487.6
2.0	3384.0
2.5	4672.8

倍率/C	d₁/mm	d₂/mm	d₃/mm
1.5	23.5	24.5	25.5
2.0	24.5	26.0	27.5
2.5	25.5	28.0	30.5