Experimental analysis of thermal management system of lithium ion power battery based on liquid medium

doi:10.19799/j.cnki.2095-4239.2019.0225

Abstract

Abstract:

Thermal management of batteries is typically performed in liquid medium, which is simply structured and accelerates the cooling speed. To explore the heat transfer effect of battery thermal management in liquid medium, this study examined the effect of coolant temperature on the maximum temperature and the maximum temperature difference in a battery pack. Comparison experiments were conducted at different ambient temperatures in a liquid-cooled lithium-ion battery thermal-management system. The overall temperature distribution inside the battery pack was analyzed using simulation software. The study revealed several shortcomings of battery thermal management in liquid media, providing a reference for improving the design of power battery thermal management systems. Placing a liquid-cooled plate at the bottom of the battery pack effectively lowered the maximum temperature of the battery. Increasing the ambient temperature enhanced the heat dissipation effect, but risked a large temperature difference between the upper and lower surfaces of the battery module. Within a certain range, the maximum temperature of the battery decreased with decreasing coolant temperature. Further cooling of the coolant disturbed the uniformity of the temperature concentration at the surface of the battery.

Key words: electric vehicle, lithium ion battery, thermal management, liquid-cooled system

CLC Number:

TM 912

ZHENG Hai, XU Yanfang, LIU Hantao, CHEN Kai, GUI Wenlong. Experimental analysis of thermal management system of lithium ion power battery based on liquid medium[J]. Energy Storage Science and Technology, 2020, 9(3): 885-891.

Figures/Tables 7

Table 1

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指标	数值
动力电池类型	三元动力电池
电池容量/A·h	144
标称电压/V	3.65
单体电池内阻/Ω	≤0.7
电池包总能量/kW·h	53.6
电池包能量密度/W·h·kg^-1	160
电池包额定输出电流/A	≤160
电池包额定电压/V	372.3

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