Study on the temperature control effect of a two-phase cold plate liquid cooling system in a container energy storage power station

doi:10.19799/j.cnki.2095-4239.2024.0029

Abstract

Abstract:

Long-term high temperatures and temperature differences can damage battery performance and lifespan. Therefore, a novel two-phase cold plate liquid cooling system has been developed for large-scale energy storage, and its temperature control effect has been measured at an energy storage power station in Xiangtan City, Hunan Province. First, the control effect of the two-phase cold plate on battery temperature variation and temperature consistency across the entire cabin and each box during the entire charging and discharging process is examined. Subsequently, the temperature variation in the battery after charging and discharging is analyzed. The results indicate that two-phase cold plate cooling can effectively mitigate temperature increases and improve the temperature consistency of the battery, reducing the maximum temperature difference from the traditional liquid cooling system range of 4.17 ℃ to within 3 ℃ during charging and discharging. Under identical conditions, the heat dissipation of the battery during charging exceeds that during discharging. If the cooling system is not turned on during the static phase, the phenomenon of elevated battery temperatures inside the power station will persist for 80 minutes or longer.

Key words: energy storage power station, battery temperature, two-phase liquid cooling, thermal management

CLC Number:

TU 831

Yaxin ZHANG, Quan ZHANG, Xujing LOU, Hao ZHOU, Zhiwen CHEN, Gang LONG. Study on the temperature control effect of a two-phase cold plate liquid cooling system in a container energy storage power station[J]. Energy Storage Science and Technology, 2024, 13(6): 1921-1928.

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参数	值	参数	值
正极材料	LiFePO₄	额定电压	3.2 V
负极材料	石墨	内阻(1 kHz)	≤0.25 mΩ
尺寸	173 mm×71 mm×204 mm	额定充电/放电速率	0.5 C/0.5 C
重量	5.34 kg	充电/放电截止电压	3.65 V/2.5 V
额定容量	280 Ah	充电/放电工作温度	0~55 ℃/-20~55 ℃
发热功率	11 W

参数	测量设备	测量范围	不确定度
室外温度	TH10R-EX温湿度自记仪	-20~80 ℃	±0.5 ℃
室外湿度	TH10R-EX温湿度自记仪	0%~95%	±5%
电池温度	BMS	-25~65 ℃	±1 ℃
制冷剂温度	K型热电偶	-20~150 ℃	±0.5 ℃
制冷剂压力	压力传感器	-1~24 bar	0.01 bar

测试工况	电池状态与冷却系统状态	电流与电压设置
1	0.5C充电+静置30 min，全程无冷却	I=140 A，U≤3.6 V
2	0.5C充电+静置30 min，全程冷却	I=140 A，U≤3.6 V

3	0.5C放电+静置30 min，全程无冷却	I=140 A，U≤2.7 V
4	0.5C放电+静置30 min，全程冷却	I=140 A，U≤2.7 V

5	(1) 0.5C充电、不冷却；(2)静置80 min、无冷却；(3)静置210 min、冷却	I=140 A，U≤3.6 V

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