Abstract
With the development of electric vehicles in China, the fault monitoring and warning systems for the charging process of electric vehicles have received the industry’s attention. A method for the monitoring and warning of electric vehicle charging faults based on a battery model is proposed in this paper. Through online estimation of the state of charge of the power battery model and battery electromotive force, parameters such as battery state of charge, voltage, and temperature can be adjusted in real time to simulate the charging response of the power battery, which can simulate power batteries of different types, specifications, and parameters. During the charging process, CAN (Controller Area Network) bus monitoring technology is used to receive and analyze the charging information of the charger, as well as the battery charging information and battery charging demand information. The charging response information simulated by the battery model is compared with the battery charging state information, and the charging state information of the charger is compared with the battery charging demand information to determine whether the charging process is normal. When it is judged that a charging fault occurs, a fault warning signal is sent. This method can identify more than 10 types of faults, including the failure of the BMS (Battery Management System) function. The comparison and analysis of actual charging accident data and power battery model data verifies the feasibility of the charging fault monitoring method proposed in this paper.
Highlights
The global environmental and energy problems are becoming increasingly severe, and electric vehicles have obvious advantages in energy saving and emission reduction, so they are developing rapidly [1,2,3,4,5]
In view of the shortcomings of current electric vehicle charging fault monitoring methods, this paper proposes an electric vehicle charging fault monitoring and early warning method based on the battery model, which can identify more than 10 types of faults including BMS
The on-site monitoring method for charging faults of electric vehicles based on the battery model mentioned in this paper can effectively find the types of faults that may occur during the charging process
Summary
The global environmental and energy problems are becoming increasingly severe, and electric vehicles have obvious advantages in energy saving and emission reduction, so they are developing rapidly [1,2,3,4,5]. From 2015 to 2017, China has successively updated and issued seven national standards related to the technical conditions and test specifications of electric vehicle charging equipment [8,9]. The State Grid Corporation has invested in the construction of charging piles and charging stations according to the national standards. According to statistics from the Charging Alliance, at the end of 2019, the number of charging piles in China has reached 1.219 million. With the construction and operation of a large number of electric vehicle charging equipment, the issue of charging reliability and safety has gradually become the focus of attention. The literature Xu et al [17]
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