811型动力电池内部温度及生热特性测试与分析

doi:10.19799/j.cnki.2095-4239.2019.0212

摘要/Abstract

摘要：

以外形结构为21700型的811型三元动力电池单体为研究对象，将其低温冷却处理后在单体负极底壳处进行局部破拆，在电池内部中心布置热电偶，在电池外表面布置薄膜式热流传感器，利用热流密度及内部温度等参数量化计算不同环境温度下电池的放电生热率。结果表明，电池在低温环境中放电时，电池会产生更多的热量从而降低电池的电能输出效率。由电池放电总生热率的分配比例计算结果可知，电池放电时生热量的主要部分将储存于电池内部。

关键词: 动力电池, 热流测试, 温度场, 生热率, 内置热电偶, 环境温度

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

中图分类号:

TM 911

胡峰, 王海民, 陈思. 811型动力电池内部温度及生热特性测试与分析[J]. 储能科学与技术, 2020, 9(3): 993-1000.

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.

图/表 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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