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Vol. 169, Issue 4, April 2014, pp. 140-144

 

Bullet

 

SOC Estimation of Power Battery Design on Constant-current Discharge
 

* Zeng Zhigang, Zhao Zhenxing, Li Yanping

Hunan Institute of Engineering, Xiangtan, 411101, China
* Tel.: (86) 13100327971, fax: (86) 073158688933

* E-mail: 12484785@qq.com

 

 

Received: 23 January 2014 Accepted: 7 March 2014 Published: 30 April 2014

Digital Sensors and Sensor Sysstems

 

Abstract: This paper takes the electric carís power battery (VRLA battery cell) as the research object, for real-time monitoring problem of power battery's state of charge (SOC) and remaining time, The system adopts micro control unit (MCU) 89S51 and AD974 to control battery discharge in constant current, Through the measurement of a periodic, get Series of working voltage, using phase-slope calculation method at this time calculating the battery's SOC and remaining time. Through the experiment, this estimation method proved the feasibility of the dynamic working point can be mapped to the static working point, and the largest relative error is no more than 7 %. For further improving the measurement accuracy and reducing error, Through the software can realize appropriate correction and compensation of temperature, aging and other interference factors. Error analysis results show that this method has small error, high measurement accuracy.

 

Keywords: Constant-current discharge, Real-time voltage, SOC estimation, Power battery.

 

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