Research on Battery Thermal Management of Pouch Cell Using a Phase Change Material-Based Thermal Switch

doi:10.12096/j.2096-4528.pgt.22113

Abstract

Abstract:

In view of the battery thermal management system, this paper proposed a new battery temperature control device based on the phase change material stearic acid and thermal switches. The device is applied to the pouch cell. The cooling and heat preservation abilities were studied based on numerical simulation. It provides the passive drive for the thermal switch based on the volume change characteristics of the organic phase change material stearic acid during the phase change process, which can effectively dissipate heat when the battery temperature increases. Thermal energy dissipation is decreased when the battery is used in a cold environment. The numerical results show that, compared with the battery without the thermal management system, the temperature control system with the phase change material and thermal switch reduces the battery temperature by 22.46 ℃ at the end of the 4 C rate charge and discharge. When the external ambient temperature is -20 ℃, the novel thermal management system prolongs the battery temperature management time by 390 s.

Key words: lithium-ion battery, battery thermal management, thermal switch, phase change material, passive temperature control

CLC Number:

TK 01

Zexu WANG, Kehan HE, Chen SUN, Kaixuan LI, Xing JU. Research on Battery Thermal Management of Pouch Cell Using a Phase Change Material-Based Thermal Switch[J]. Power Generation Technology, 2022, 43(5): 810-822.

Figures/Tables 15

References 43

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参数	Li _x C₆(负极)	LiMn₂O₄(正极)
电极固相扩散系数/(cm²/s)	3.9×10^-10	10×10^-9
交换电流密度/(mA/cm²)	0.11	0.08
最大电解质盐浓度/(mol/dm³)	26.39	22.86
粒子半径/µm	2.5	1.7
电极体积分数	0.384	0.43
电解质体积分数	0.444	0.4
初始电解质盐浓度/(mol/m³)	22 055	4 001
电极电导率/(S/cm)	1.0	0.038

参数	Li _x C₆(负极)	LiMn₂O₄(正极)
电极固相扩散系数/(cm²/s)	3.9×10^-10	10×10^-9
交换电流密度/(mA/cm²)	0.11	0.08
最大电解质盐浓度/(mol/dm³)	26.39	22.86
粒子半径/µm	2.5	1.7
电极体积分数	0.384	0.43
电解质体积分数	0.444	0.4
初始电解质盐浓度/(mol/m³)	22 055	4 001
电极电导率/(S/cm)	1.0	0.038

项目	导热系数/[W/(m⋅K)]	厚度/ µm	密度/ (kg/cm³)	比热/ [J/(kg⋅K)]
正极	1.508	55	2 328.5	1 269.21
负极	1.04	55	1 347.33	1 437.4
正极集流体	170	10	2 770	875
负极集流体	398	7	8 933	385
隔膜	0.344	30	1 008.98	1 978.16

项目	导热系数/[W/(m⋅K)]	厚度/ µm	密度/ (kg/cm³)	比热/ [J/(kg⋅K)]
正极	1.508	55	2 328.5	1 269.21
负极	1.04	55	1 347.33	1 437.4
正极集流体	170	10	2 770	875
负极集流体	398	7	8 933	385
隔膜	0.344	30	1 008.98	1 978.16

参数	数值
1 C倍率放电电流密度/(A/m²)	12
电池导热系数/[W/(m⋅K)]	X方向：29.557
	Y方向：0.897
	Z方向：29.557
电池密度/(kg/m³)	2 055.2
电池比热/[J/（kg⋅K)]	1 399.1