Development And Integration Design Of Power Lead-acid Battery Management With Charging System For Super Micro-electric Vehicle

In recent years, with the environment and energy issues have become increasingly prominent, automobile industry suffered the pressure from petroleum shortage and environmental pollution. Therefore, the development of pure electric vehicle has been got widespread concern in various countries. In China, super micro-electric vehicles have developed rapidly and receive attentions from people all the country. The super micro-electric vehicles have the advantage of light weight, small volume, lower manufacturing cost, environmental protection and energy saving, which is the ideal tools to remit the energy shortage, environmental pollution and traffic jam. The development of battery management system as the key of all kinds of electric vehicle industrialization, it is also one of the hot research topic of current electric vehicle. This paper based on the independent laboratory research topic development of the super micro-electric vehicles as the center. Develop the research work around the battery management system which is one of the three core components of electric vehicles① Aim at the independent laboratory research subject development of super micro-electric vehicles, select the valve control lead-acid battery as the power battery depend on the aspects of cost and safety. And on the basis of the relative mature experience of battery management system at home or abroad and the working characteristics of the super micro-electric vehicles, bring the design of the charger into the management system, then design the integration battery system which include the batteries,.management system and the charger. At the same time determine the overall design scheme of electrical and mechanical of the system② According to the relevant national standard and industry standard. Complete the battery performance test with the selected battery, including the actual capacity test, the charge and discharge ratio test, life cycle test and etc. And obtain the relevant feature information of the battery.③ Base on the integration system solutions and battery experimental features. Develop the related control methods of SOC, SOH, balanced and charging function module of the integrated system.④ Completed the hardware modular design of each circuit, Including the minimum system circuit, data acquisition circuit, power supply circuit, charging circuit, information management and so on. On the premise of considering electromagnetic compatibility, Completed the design and production of the printed circuit board, at the same time finish the module components selection, welding and hardware debugging.⑤ On the basis of the hardware design, complete the layer design of the software system from the point view of software reliability, Established the total process of the software system and the communication protocol between each controller in the super micro-electric vehicles base on the CAN bus. Then finish the program design of each function module of the system including: parameter acquisition, SOC estimation, SOH estimation, balanced management and so on.⑥ Combined with the hardware, software and relevant control methods, verifying the performance of the system and realize the normal operation of each function module by debugging the performance and function of the integration system. At the same time, finished the vehicle in-wheel hub motor bench test with the steering controller and driving controller, and test verifies the rationality and reliability of the system.