Research on the liquid cooling technology of a lithium iron phosphate battery pack under a peak load regulation in a power grid

doi:10.19799/j.cnki.2095-4239.2024.0131

Abstract

Abstract:

Peak shaving is an important operating condition for battery energy storage power stations, and battery cooling is crucial for the safe operation of batteries. This study investigated the liquid cooling technology of lithium iron phosphate battery packs under peak shaving conditions. First, the heat generation and liquid cooling of the lithium iron phosphate battery pack under actual peak shaving conditions were studied, and heat generation and liquid cooling models of the lithium iron phosphate battery pack under peak shaving conditions were established. Second, the liquid cooling model of the lithium iron phosphate battery pack under peak shaving conditions was optimized through a finite element simulation analysis. Finally, the liquid cooling was optimized by adjusting the flow direction of the cooling liquid and adjusting the flow rate. The simulation and experimental results showed that a reasonable setting of different cooling-pipe coolant flow directions can effectively improve the uniformity of liquid cooling heat dissipation. By comparing the simulated temperature cloud map and innovatively adopting the difference between the maximum and average temperatures, the superiority and inferiority of the uniformity of different schemes can be reflected. Although increasing the flow rate helped to cool down, when the liquid cooling rate reached or exceeded 2.0, the increase in the cooling effect was limited, but the energy consumption increased significantly. Through simulation results, the optimal flow rate range was proposed to be between 1.5 and 2.0. The proposed solutions have been experimentally validated and applied in for battery cooling in energy storage power stations.

Key words: lithium ion batteries, peak shaving, liquid cooling, finite element simulation

CLC Number:

TM 912

Yuelin CHEN, Hongzhong MA, Muyu ZHU, Wenjing XUAN, Sihan WANG. Research on the liquid cooling technology of a lithium iron phosphate battery pack under a peak load regulation in a power grid[J]. Energy Storage Science and Technology, 2024, 13(8): 2704-2712.

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参数	数值
标称电压/V	25.6
标称容量/Ah	220
长度/mm	555.0±3
宽度/mm	430.0±3
高度/mm	154.0±3
质量/kg	约60.0
连接方式	串联
工作电压/V	2.7~3.8

优化方式	冷却位置	方案	降温效果(最终温度)/℃	∆T /℃
调整冷却液流入方向	侧边	方案二	26.5	0.9
		方案四	26.7	0.7
		方案五	26.6	0.5
		方案六	27.4	0.4
	底部	方案一	27.2	1.5
	底部	方案三	27.7	0.7

增大流量	侧边	流量倍率在1.5倍左右	25.8	—
增大流量	底部	流量倍率在1.5~2.0之间	25.6~25.8	—

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