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The Scientific World Journal
Volume 2013, Article ID 261313, 12 pages
http://dx.doi.org/10.1155/2013/261313
Research Article

A Novel Series Connected Batteries State of High Voltage Safety Monitor System for Electric Vehicle Application

School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China

Received 22 May 2013; Accepted 14 July 2013

Academic Editors: C. Bao and S. Park

Copyright © 2013 Qiang Jiaxi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Batteries, as the main or assistant power source of EV (Electric Vehicle), are usually connected in series with high voltage to improve the drivability and energy efficiency. Today, more and more batteries are connected in series with high voltage, if there is any fault in high voltage system (HVS), the consequence is serious and dangerous. Therefore, it is necessary to monitor the electric parameters of HVS to ensure the high voltage safety and protect personal safety. In this study, a high voltage safety monitor system is developed to solve this critical issue. Four key electric parameters including precharge, contact resistance, insulation resistance, and remaining capacity are monitored and analyzed based on the equivalent models presented in this study. The high voltage safety controller which integrates the equivalent models and control strategy is developed. By the help of hardware-in-loop system, the equivalent models integrated in the high voltage safety controller are validated, and the online electric parameters monitor strategy is analyzed and discussed. The test results indicate that the high voltage safety monitor system designed in this paper is suitable for EV application.