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以320V/100A.h磷酸铁锂动力电池组为研究对象,在电动汽车动力电池性能测试试验台上对电池组容量效率、开路电压及电压性效率等特性参数进行了测试.采用二次多项式构建了电池组放电效率模型,描述放电效率与电流及电池荷电状态之间的关系.利用实车测试的电池组放电电流对建立的模型进行了验证,模型的放电效率计算值与实测值的最大相对误差为0.8%,建立的模型是有效的.
Taking the 320V / 100A.h lithium iron phosphate battery as the research object, the characteristic parameters of the battery capacity efficiency, the open circuit voltage and the voltage efficiency were tested on the test bench of the battery performance test of the electric vehicle.Using quadratic polynomial The battery discharge efficiency model is described, and the relationship between the discharge efficiency and the current and battery state of charge is described. The established model is verified by the discharge current of the battery in real vehicle test. The calculated discharge efficiency and the maximum The relative error is 0.8%, and the established model is effective.