Cells of 25 Ah with mass of 850 g were designed and tested with LiFePO4(LFPO)as cathode material according to electrical vehicle demands.Discharges of different rates,cycles tests and abuse tests were adopted to certify that the cells have a discharge capacity of 26 Ah at 1 C rate and a high-rate capacity retention of 98%even at 6 C rate(150 A).The voltage at 50%SOC(state of charge)is about 3.0 V when discharged at 6 C rate.The capacity retention of 25.Ah cells is about 90%after 1 700 cycles.All the abuse tests on 25-Ah cells were carried out based on"Electrical Energy Storage System Abuse Test Manual for Electric and Hybrid Electric Vehicle Applications"suggested by U.S.Department of Energy FreedomCAR&Vehicle Technologies Program with satisfactory results.The 16-kWh EV battery units each assembled by 2 parallel,102 series connections using these batteries have been delivered to Shanghai Automotive Industry Corporations.%为适合电动车用需求,设计并测试了质量850 g容量25Ah磷酸铁锂为阳极的电池.采用了不同的倍率放电,循环测试和滥用测试等方法,对电池性能进行了评估.该电池在1C倍率放电条件下容量达到26 Ah;在6 C倍率(150A)放电下,50%充电状态(SOC)电压在3 V左右,容量保持可达98%.在1700次循环后,保持90%的容量.电池通过了由美国政府制订的相关标准中的全部"滥用"测试.可以得出结论:该电池具有平缓的放电电压平台和很好的放电性能,长循环寿命均符合车用要求.由该单体电池2并联102串联所组装的16 kWh车用电池系统已经提交给上海汽车集团测试使用.
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