Title: Study on comprehensive performance of Ni-MH power battery used in HEV at different temperatures

Authors: Xiang Chen; Yelin Deng; Xueliang Fan; Yinnan Yuan; Aihua Chu; Jianxin Zhu

Addresses: School of Rail Transportation, Soochow University, 8 Jixue Road, Xiangcheng District, Suzhou 215131, China ' School of Rail Transportation, Soochow University, 8 Jixue Road, Xiangcheng District, Suzhou 215131, China ' School of Rail Transportation, Soochow University, 8 Jixue Road, Xiangcheng District, Suzhou 215131, China ' School of Rail Transportation, Soochow University, 8 Jixue Road, Xiangcheng District, Suzhou 215131, China ' Corun Hybrid System Technology Co., LTD., 2888 Wanfeng Road, Fengjing Industrial Park, Jinshan District, Shanghai 201501, China ' Corun Hybrid System Technology Co., LTD., 2888 Wanfeng Road, Fengjing Industrial Park, Jinshan District, Shanghai 201501, China

Abstract: This study carries a comprehensive investigation on the influences of the key environmental and operating parameters on SOC and cycling life of the Ni-MH battery. The Ni-MH cells were tested through loading the actual road spectrum at different temperatures (25/35/45°C). Other parameters of SOC fluctuation and currents are set to be 10% and 15.5A by average, respectively. Tests have been performed to obtain the OCV (open circuit voltage)~SOC curves at different temperatures under the 1-C rate of charging/discharging. The investigation results show that the capacity decay compared to initial capacity is increased by a slight 2.46% at 45°C, demonstrating an excellent cycling performance of the Ni-MH battery. Additionally, the battery polarization effect is found to be correlated to the charging and discharging processes and temperature. In summary, this study presents a comprehensive factor analysis needed to achieve a reliable SOC estimate for the Ni-MH based HEV.

Keywords: Ni-MH battery; HEV; hybrid electric vehicle; polarisation effect; cycling life; SOC estimate; state of health; open circuit voltage; OCV.

DOI: 10.1504/IJVP.2021.116057

International Journal of Vehicle Performance, 2021 Vol.7 No.3/4, pp.226 - 243

Received: 15 Jan 2020
Accepted: 04 Mar 2020
Published online: 07 Jul 2021 *

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