不同充电倍率下锂离子电池组冷却系统结构设计

doi:10.19562/j.chinasae.qcgc.2022.04.004

Abstract

Abstract:

Aiming at the requirements of highest temperature and temperature evenness on lithium-ion battery pack at different charging rates， the thermal model for traction battery is constructed and a simulation is conducted with suppressing the highest temperature and maximum temperature difference as objectives to analyze the effects of the arrangement of liquid cooling plates， flow path design and the position of cooling inlet and outlet on the thermal status of battery pack. The results of simulation show that with the cooling system designed， the highest temperature and maximum temperature difference of battery pack can be controlled at below 35.5 ℃ and 5 ℃ respectively at a charging rate of 2C.

Key words: lithium battery, charging, cooling system, temperature evenness

Xiaogang Wu,Mingshan Qi,Jiuyu Du,N. I. Shchurov,A. A. Shtang. Structure Design of Lithium-ion Battery Cooling System at Different Charging Rates[J].Automotive Engineering, 2022, 44(4): 482-494.

Figures/Tables 27

References 31

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参数	数值
质量/g	640±30
长宽高/mm	210×195×7.6
标称容量/（A·h）	32
质量能量密度/（W·h·kg^-1）	192±10
体积能量密度/（W·h·L^-1）	395±10
标称电压/V	3.65
截止电压上限/V	4.2
截止电压下限/V	3.0
工作温度/°C	充电： 0~45 放电： -20~50

设备名称	主要参数	备注
充放电机	电压范围：0~5 V；电流范围：0~300 A	电压、电流精度：±0.1%
高低温交变湿热实验箱	温度范围：-40~100 ℃；温度波动：<2 ℃	温升速率：1.0~3.0 ℃/min；降温速率：0.7~1.0 ℃/min
HIOKI LR8501数据采集器	60通道	测量对象：电压、热电偶
TT-K-36-SLE热电偶	耐温范围：-200~260 ℃	精度等级：Ι 级误差精度：0.4%
FOTRIC 340热成像仪	温度范围：-20~120 ℃；0~650 ℃	温度精度：±2 ℃；分辨率：640×480

充电倍率	模组内最高温度/℃	模组内最大温差/℃
1C	39.5	5.8
1.5C	43.4	7.5
2C	45.1	8.3

参数	底部冷板	侧面冷板
冷板尺寸	193×120×4	100×186×4
流道尺寸	8.5×2
出入口尺寸	直径 8.5

出入口位置类型	最高温度/℃	最大温差/℃	出入口最大温差/℃
Side_1	31.98	7.00	0.29
Side_2	32.00	7.02	0.30
Side_3	32.02	7.10	0.29
Side_4	31.94	6.80	0.27

Structure Design of Lithium-ion Battery Cooling System at Different Charging Rates

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