Test and analysis of internal temperature and heat generation characteristics of 811 type power battery

doi:10.19799/j.cnki.2095-4239.2019.0212

Abstract

Abstract:

The 811 type ternary power battery cell with 21700 shape structure is taken as the research object. After low temperature cooling treatment, it is partially dismantled at the bottom of the single anode, and a thermocouple is arranged in the center of the battery to be arranged on the outer surface of the battery. The film type heat flow sensor quantifies the discharge heat generation rate of the battery at different ambient temperatures by using parameters such as heat flux density and internal temperature. The results show that when the battery is discharged in a low temperature environment, the battery will generate more heat and reduce the power output efficiency of the battery. It is known from the calculation result of the distribution ratio of the total heat generation rate of the battery discharge that a major portion of the heat generation when the battery is discharged is stored inside the battery.

Key words: power battery, heat flow test, temperature field, heat generation rate, built-in thermocouple

CLC Number:

TM 911

HU Feng, WANG Haimin, CHEN Si. Test and analysis of internal temperature and heat generation characteristics of 811 type power battery[J]. Energy Storage Science and Technology, 2020, 9(3): 993-1000.

Figures/Tables 13

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项目	参数	备注
电池单体	三元锂离子动力电池4.6 A·h，3.6 V	811型21700结构
恒温箱	均匀度为±2 ℃
环境温度	25 ℃
充电环境温度	25 ℃
充电倍率	0.5 C，4.2 V	2.3 A，CC-CV式充电
放电环境温度	-20 ℃，-10 ℃，0 ℃，10 ℃，20 ℃，30 ℃，40 ℃	7个环境温度
放电倍率	1 C	恒流放电

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