磷酸铁锂动力电池自放电筛选工艺研究  

Research on Self-Discharge Screening Process of Lithium Iron Phosphate Power Battery

作　　者：张晓琴 王言敬 张庭旭 张瑞 ZHANG Xiaoqin;WANG Yanjing;ZHANG Tingxu;ZHANG Rui(Lishen(Qingdao)New Energy Co.,Ltd.,Tianjin 300384,China)

机构地区：[1]力神(青岛)新能源有限公司,天津300384

出　　处：《汽车零部件》2024年第8期36-40,共5页Automobile Parts

摘　　要：将磷酸铁锂-石墨作为正负极材料制备超大容量卷绕式单体电池(202 Ah),对比了两种化成工艺分别在100%电池荷电状态(SOC)和30%SOC下老化相同时间后的电池电压、压降以及K值变化情况。结果表明:在100%SOC老化阶段,电池K值分布均呈弥散状态,无法通过K值筛选自放电电池;经过100%SOC老化后,再经过30%SOC老化,电池K值散布较大,可在较快时间内准确地将自放电电池筛选出来,且首次充满电化成工艺的自放电筛选效果略优于二次充满电化成工艺的自放电筛选效果。Lithium iron phosphate-graphite was used as the cathode and anode materials to prepare a super-large capacity winding single battery(202Ah), and the voltage, voltage drop and K value changes of two different formation processes were compared after aging at 100% state of charge (SOC)and 30% SOC for the same time. The results showed that in the 100% SOC aging stage, the K value distribution of the battery was diffuse, and the selfdischargebattery could not be screened by the K value. After 100% SOC aging, and then through 30% SOC aging, the K value of the battery is dispersedgreatly, and the self-discharge battery can be accurately screened in a relatively fast time, and the self-discharge screening effect of the first full chargeformation process is slightly better than the self-discharge screening effect of the second full charge formation process.

关 键 词：磷酸铁锂电池 自放电筛选 电池荷电状态 K值 

分 类 号：TM912.9[电气工程—电力电子与电力传动]