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Abstract

With the social development£¬ increasingly prominent energy issues and environmental protection issues£®pure electric vehicles with zero emissions,low noise advantages arc getting growing attention by the word,electric vehicles have to be the current of automohile industry green car£®As the fast development of the electric vehicle,the requirement to the battery technology is higher and higher£®So the management of the battery working state is also more and more important£®The paper has deeply studied the traction battery management system of electrical vehicles and the lofical design thoughts and realized methods have been put forward£®At first introduced electric vehicle and the history of the development of the battery management system cell technology,and the remaining margins of several models£®In this paper MH-Ni batteries is researched,by careful analysis of MH-Ni batteries work principles,the battery voltage,current and temperature characteristics£® Then a logical SOC measuring method has been raised,which is the combination of exprience and integral calculation£®On the base of researching quick-charging theory and some charging method, the two phases charging mode has been put forward£»probed into the control technique of quick-charging for battery,in the actual design,used the colligation control method,which made up by voltage negative-increment control¡¢topmost voltage control and temperature control£®The design of a distributed,modularized electric battery management system comprised by center control¡¢intelligent charging¡¢and voltage¡¢temperature¡¢current measuring modules was described,in which the data cornmunication by LIN Bus. Concretely analyzed the circuit parameter in hardware design,used the Atmegaol as the MCU¡£

Keywords: Single-chip;internal control;DS

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