Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1451-1458.doi: 10.13229/j.cnki.jdxbgxb20180354

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Influencing factors analysis and experimental study of battery performances in hybrid electric vehicle

Guang-hui FAN1,2(),Jian-wu YU1,2(),Hong LUO2,Xin LI2,Ya-fei ZHANG1   

  1. 1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
    2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
  • Received:2018-04-16 Online:2019-09-01 Published:2019-09-11
  • Contact: Jian-wu YU E-mail:79022719@qq.com;yokenbu@yahoo.com

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Abstract:

Taking a lithium pouch battery of a hybrid electric vehicle as the research object, the influences of temperature and State of Charge (SOC) on battery capacity, DC internal resistance and open-circuit voltage were experimentally studied. Also the factors influencing the battery life were analyzed. The performance parameters of a large number of lithium batteries were statistically tested, the consistency and correlation of the battery performance parameters were investigated. Experimental results show that over high or over low temperature could lead to an increase in battery resistance and a decrease in battery capacity, which reduces battery life. Excessively low SOC can also cause the increase of internal resistance of the battery and the drastic change of open-circuit voltage, which not only reduces the battery life, but also weakens the efficiency of the battery. There is a certain correlation between the performance parameters of the batch battery, and its consistency is greatly influenced by the number of batteries. The optimization of the number of batteries, the use of temperature and the SOC not only improves the dynamic performance, but also significantly improves the service life of the hybrid electric vehicle.

Key words: vehicle engineering, battery capacity, direct current resistance, open circuit voltage, battery life

CLC Number: 

  • U469.72

Fig.1

Schematic diagram of ARC test"

Fig.2

ARC adiabatic test equipment"

Fig.3

Temperature measuring device and test site"

Fig.4

Power battery charging and discharging test equipment"

Fig.5

Battery cell"

Table 1

Basic battery performance parameters"

项 目标 准
标称容量/(A·h)32
容量范围/(A·h)31~33
标称电压/V2.2
交流内阻/mΩ≤1
充电截止电压/V2.8±0.05
充电截止电流/A0.01
放电截至电压/V2.5
循环寿命/次8000
最大持续放电电流/A9
5 s脉冲放电电流/A320
充电工作温度/℃0~55
放电工作温度/℃-20~60
储存温度/℃-20~45
电池重量/g860±20

Table 2

Design of temperature conditions of"

工况序号环境温度/℃放电倍率/C
1-201
201
3251
4451

Table 3

Definition of battery parameter variable"

随机变量电池参数相关系数相关性
xi电池容量Cxyxiyi相关性
yi直流内阻Cxzxizi相关性
zi开路电压Cyzyizi相关性

Fig.6

Battery parameter test data"

Fig.7

DC resistance curves of battery at different SOC and temperatures"

Fig.8

Standard error of battery parameters"

Table 4

Battery parameter"

参 数电池容量/(mA·h)直流内阻/mΩ开路电压/mV
均值323520.4562229
标准差210.80.041 41.309
标准误差/%0.659.080.59

Fig.9

Correlation curve of battery parameters"

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