Heat dissipation performance of a power battery module based on thermoelectric cooling

doi:10.19799/j.cnki.2095-4239.2020.0142

Abstract

Abstract:

This study investigates the thermoelectric cooling performance for a battery module. Cylindrical battery modules are arranged in a 3×5 array, and thermoelectric cooling systems are symmetrically arranged on both sides. A one-dimensional thermal resistance network of battery modules is established using a theoretical analysis to evaluate the thermal performance. The thermal resistance of the thermoelectric cooler (TEC) double-sided symmetric layout is obtained through an experimental measurement. The theoretical analysis method is used to study the maximum cooling power, COP, and optimal working current of the TEC by changing the TEC current, battery temperature, cold and hot-side thermal resistances, and TEC arrangement. The results show that the cold-side temperature of the TEC first decreases then increases with the TEC current increase, whereas the hot-side temperature gradually increases with the TEC input current increase. The cooling power first increases then decreases as the TEC current increases. The COP value of the TEC gradually decreases as the current increases. The cooling efficiency when the battery temperature is 30—50 ℃ is between 0.45 and 0.60. The optimal operating current corresponding to the maximum cooling power is between 5.50 A and 6.25 A. The cold- and hot-side thermal resistances affect the cooling power and the optimal cooling current of the TEC. The optimal TEC current corresponding to the maximum cooling power is greatly affected by the hot-side thermal resistance, but barely affected by the cold-side thermal resistance.

Key words: thermoelectric cooling (TEC), thermal management, thermal resistance network, thermoelectric cooling performance, steady state analysis

CLC Number:

TK 511

Junwei LI, Hengyun ZHANG, Xiaoyu WU, Ying WANG. Heat dissipation performance of a power battery module based on thermoelectric cooling[J]. Energy Storage Science and Technology, 2020, 9(6): 1790-1797.

Figures/Tables 9

Table 1

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Table 2

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Table 3

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参数名称	数值
额定容量/mA·h	2700
标称电压/V	3.60
充电截止电压/V	4.2
放电截止电压/V	2.5
最大连续充电电流/A	1.35
最大连续放电电流/A	10.0
电池质量/g	48.0

TEC参数	TEC
热电臂个数,2N	254
尺寸/mm	50 × 50 × 3.3
I_max/A	10
U_max/V	15.2
ΔT_max/K	62
Q_max/W	94.2
S_m/V·K^-1	0.0507
R_m/Ω	1.2060
K_m/K·W^-1	0.9725
Z/K^-1	0.0022

各部分热阻	值/K·W^-1
热界面材料热阻R_tim	0.074±0.003
#8号电池到铝壳的热阻R_bw	0.320±0.010
散热器热阻R_sink	0.055±0.004
远程换热器热阻R_hea	0.056±0.001
TEC冷端热阻 R_bc	0.394±0.005
TEC热端热阻R_ha	0.185±0.003

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