探讨边单格引起失效的原因  

Discussion on the reasons for failure caused by outside cell

作　　者：杨建芬 刘玉 占美青 方明学 王卫东 李丹 张峰博 薛卫洁 YANG Jianfen;LIU Yu;ZHAN Meiqing;FANG Mingxue;WANG Weidong;LI Dan;ZHANG Fengbo;XUE Weijie(Tianneng Battery Group Co.,Ltd.,Huzhou 313100,Zhejiang,China)

机构地区：[1]天能电池集团股份有限公司,浙江湖州313100

出　　处：《电池》2025年第2期314-318,共5页Battery Bimonthly

基　　金：企业自研项目(Z1300137)。

摘　　要：边单格落后引发整只电池失效的现象占比很高。通过解析发现失效原因是,由电解液浓度分层引起的边单格负极板上下部活性物质的利用不均。结合失效原因,从电池结构缺陷和壳体脱模斜度等两方面对边单格落后的成因探讨。1×6电池结构边单格在相同过充电量下隔板酸密度变化大于中间单格,可通过改进壳体结构,减小单格间差异。壳体脱模斜度选取不当,会减少电解液量,加剧电解液分层,在0.7~0.9 mm选取脱模斜度,可以改善该现象。The phenomenon of the entire battery failing due to the backwardness of the outside cells accounts for a high propertion.Through analysis,it is found that the failure is caused by uneven utilization of active materials in the upper and lower parts of the negative electrode plate of the outside cells due to electrolyte concentration stratification.Based on the causes of failure,the reasons for the backwardness of outside cells are explored from two aspects:battery structural defects and shell demolding slope.The acid density of the separator in the outside cells of a 1×6 battery structure changes more compared with inside cells under the same overcharge level,the difference between cells can be reduced by improving the shell structure.Improper selection of demolding slope for the shell can reduce the amount of electrolyte and exacerbate electrolyte stratification.Choosing a demolding slope in 0.7-0.9 mm can improve this phenomenon.

关 键 词：阀控式密封铅酸电池(VRLA) 失效解析 单格落后 酸分层 

分 类 号：TM912.1[电气工程—电力电子与电力传动]