With the rapid development of electric vehicles, its energy source of a battery pack, has become the bottleneck of the development of electric vehicles. Battery management system is related to electric vehicles practical, market-oriented one of the key technologies, and energy management systems as an important part of the prediction of remaining battery capacity of electric vehicles practical, commercial play an important role, the study battery management technologies and systems is of great significance.This article describes the pure electric vehicle with lithium-ion battery management supporting system design and implementation. First, a large number of charge-discharge test and vehicle test data acquisition, based on detailed analysis of the lithium-ion battery charge and discharge characteristics of the principle and for the state of battery power, we proposed Ah, dynamic voltage method and the Kalman filtermethod are combined to predict the remaining capacity of lithium-ion battery (SOC).Secondly, the battery management system hardware design described in detail, including the testing board, control board, communication module of three parts. In terms of software, after the introduction of the development environment, focusing on the important modules about the design process. In the interference, the use of the hardware and software interference immunity was the combination of methods. Finally, experimental platform to build electric car, lithium iron phosphate group to the hardware and software systems and design of joint commissioning, testing, testing had relevant data. The results show that the introduction of the battery management system is reliable, anti-interference ability. Can be achieved: the battery voltage, current, temperature and other analog acquisition; the calculation of remaining capacity and battery status of the judge; real-time display, a fault alarm and other related functions.
Key words: electric cars, battery management system, SOC, CAN bus
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