电源技术2025，Vol.49Issue(5)：973-977,5.DOI:10.3969/j.issn.1002-087X.2025.05.012
磷酸铁锂电池过充的失效分析
Failure analysis of overcharge of lithium iron phosphate batteries
王宝俊 1黄海宁 1刘阳 1缪志强1
作者信息
- 1. 瑞浦兰钧能源股份有限公司,浙江嘉善 314100
- 折叠
摘要
Abstract
To address the failure issue of lithium iron phosphate batteries caused by overcharging,this study compares the overcharging curve characteristics of various batches of lithium iron phosphate batteries.Additionally,by utilizing multiple characterization analysis methods,we investigate the fail-ure phenomenon and mechanism of battery caused by overcharging.When the batch B battery was overcharged to 1 070 s,the battery short circuited and caused thermal runaway.The disassembly photos of the R corner of the anode revealed a grayish-black morphology,indicating a severe Fe pre-cipitation reaction.The Fe element originates from rod-shaped impurities containing 33.22%Fe in the cathode.The precipitated Fe metal uniformly fills the base film layer of the separator,causing short circuit during the overcharge of the battery.Short-circuit discharge of the battery can cause Li+to re-intercalate into the positive electrode,resulting in an initial discharge capacity of only 92.21 mAh/g for the cathode.This finding offers a theoretical basis for the design and overcharge tolerance performance improvement of 300 Ah high-capacity and high-safety lithium iron phosphate batteries.关键词
磷酸铁锂电池/过充机理/短路/析铁Key words
lithium iron phosphate battery/overcharge mechanism/short circuit/Fe precipitation分类
信息技术与安全科学引用本文复制引用
王宝俊,黄海宁,刘阳,缪志强..磷酸铁锂电池过充的失效分析[J].电源技术,2025,49(5):973-977,5.
