Experimental and simulation on battery thermal management based on a large flat heat pipe

doi:10.19799/j.cnki.2095-4239.2021.0092

Abstract

Abstract:

Thermal characteristics are a major factor affecting the performance of lithium-ion batteries. When a battery is charged and discharged at a high rate, heat accumulation causes the temperature to rise rapidly, affecting the battery performance and even causing the danger of combustion or explosion. In this study, the heat generation mechanism of lithium-ion batteries is studied by combining theory with experiment. The HPPC pulse current method is used to identify the internal ohmic resistance and internal polarization resistance of the battery offline, and the heat transfer coefficient of the flat heat pipe is identified by the least square method. Under various working conditions, the average temperature and the maximum temperature difference at the battery surface were calculated, and the accuracy of the thermal management model was experimentally verified. At an ambient temperature of 20 ℃, a cooling wind speed of 5 m/s, and the discharge of the battery pack at the cut-off voltage of 1 C, the average temperature of the battery pack is 38 ℃, and the maximum temperature difference is 1.9 ℃. When the heat exchange area increases, the heat exchange efficiency improves. This research promotes the application of flat heat pipes in the heat dissipation of power batteries and provides a basis for ensuring the safety and efficiency of batteries under high-rate charging and discharging.

Key words: the hybrid pulse power characterization, large flat heat pipe, temperature uniformity, air-cooling

CLC Number:

TM 911

Bin LIU, Ziqiang HU, Kuining LI, Yi XIE, Jintao ZHENG. Experimental and simulation on battery thermal management based on a large flat heat pipe[J]. Energy Storage Science and Technology, 2021, 10(4): 1364-1373.

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参数	数值	参数	数值
尺寸/mm	149×27×97	恒压最大充电电压/V	4.2
重量/kg	0.84	放电终止电压/V	2.75
标称电压/V	3.7	最大充电倍率/C	1
标称容量/A·h	50	—	—

方案	网格数量/个	壁面平均温度/K
1	131054	42.3
2	251438	44.6
3	483461	44.3
4	813278	44.7

仿真条件	参数值
入口边界条件	速度入口
出口边界条件	压力出口
放电倍率/C	0.5	0.6	0.7	0.8
环境温度/℃	20	25	30	35	40
进口风速/m·s^-1	2	3	4	5

单体编号	最高温度/℃	最低温度/℃	温差/℃
1	43.9	42.9	1.0
2	44.6	44.3	0.3
3	45.1	44.5	0.6
4	45.1	44.0	1.1

工况	数值					环境温度/℃
不同放电倍率(绝热)/C	0.5	0.6	0.8	1		30
不同放电倍率(热管散热)/C	0.5	0.6	0.8	1		30
不同环境温度(放电倍率1C)/℃	20	25	30	35	40	-