| Based on the request of energy saving and environmental protection, the researchand improvement of the electric car have drawn more and more attention of thecountries all over the world. And as one of the key technologies of electric carresearch, high performance battery charging device and the combination of intelligentnetwork management and electric cars also get the attention of various countries’scientific research institution and scientific research personnel. In the electric vehiclecharging station which is combined with intelligent power system, the solar energyand wind power is the more extensive application of clean energy, but theirschedulability is not high and randomness is stronger. Therefore we need the device tostore power to let the battery charging station use the storge power to supply theelectric vehicle in the absence of power grid and photovoltaic power supply. And alsostore energy generated by photovoltaic in the absence of vehicle charging.Lead acid battery is the currently widely used storage power device, and atpresent it has the features of low cost, large power, and simple manufacturing process.With its application fields gradually expand, maintenance is more and more valued,especially the charge and discharge balance control highly impact the battery life. Ifthe charging technology can not adapt to the special requirements of lead-acid batteryor the series battery charging and discharging is disequilibrium, it can make theaccumulator hard to meet the prescribed cycle life. Battery long-term discharge iseasy to cause over-discharge which can lead to cell damage. Therefore, appropriatebattery charging and discharging circuit and battery management system should bedesigned.This topic is part of the electric vehicle charging the system based on intelligentgrid. This article develops battery charging and discharging DC-DC convertor deviceand battery management system suitable for storage part of this system. According tothe characteristics of the lead-acid battery, combined with the electric vehicle chargingand discharging characteristics, the bidirectional conversion device is designed, whichcan decrease the voltage from high dc bus to charge battery, and also can boost thebattery voltage to supply the dc bus; At the same time, design a battery managementsystem suitable for lead-acid battery, which can realize the battery charging and discharging equilibrium, battery capacity detection and other functions to achieve thepurpose of extend battery life. |
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