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UP423467A4HSwellingIssueAnalysisReportQA&TechDept./BatteryGroupSonyElectronics(Wuxi)Co.,Ltd.Aug29,20031ClaimInformationCustomer:

Motorola/ESG(Tianjin)SonyModel:UP423467A4HClaim:

CellSwelling(2pcs)wasfoundafteropeningthepackage.LotNo.:

6LA17E(1pcs);6KK04C(1pcs)Customerrequest:Tomakefailureanalysisandcorrectiveactionbysupplier.Aug29,20032Customer’stestdataAug29,200332)TestdatabySEW:(stateinreceiving)1#:OCVis0V,andthicknessisNG;2#:OCVandIMPisnormal,thicknessisNG3)NocircuitshortwasfoundbetweenTabandAl-filmbyvoltagecheck.Initialanalysis(1#&2#)Aug29,20035Detailanalysis(1#,6LA17E)1,ReasonofOCV0VandswellingCellswellingisbecauseofgasgeneration,andgasgenerationiscausedbyoverdischarge(OCVislow,ornear0V).Furthermore,thereasonwhyOCVbecomes0V(over-discharge)iscausedbychemicalinternalshortcircuit.Throughobservewithmicro-scope(photo1),wefindthereismetaldeposition(copper;analyzedbySEM)ontheseparator,whichresultstotheshortcircuitbetweenanodeandcathodematerial.Afterlongtimestorage,theOCVmaygraduallydroppedto0V,andsodidtheswellingcomeintobeing.

Photo1bymicro-scope(30times)Metaldepositiononseparator(copper)Aug29,200362,Rootcause:(1#,6LA17E)Afterourinvestigation,wefindthepossiblerootcauseofswelling,whichisinvasionoftinymetalparticlesduringcellmanufacture.(Slittingmachine,photo2)InSlittingprocess,wehaveoneslittingmachineforbothanodeJ/RandcathodeJ/R.Thus,ifthetoolsisnotcleanenough,tinycopperparticlefromanodeJ/RPhoto2:SlittingmachineRootCause(1#)mayremainsonthemachineandcontaminatesthecathodeJ/Rbyrareaccident.ThepossibilityexistsonlyJ/Rchange.Aug29,20037Countermeasure/Correctiveaction(1#)WhenJ/Rchangingfromanodetocathodeorreverse:1)Toolschange;(Slittingknife,cleaningbrush,cleaningpaper,guideroller)(alreadyfinished)2)StopbarwillalsobecleanedwhenJ/Rchanging;(photo3)(May15,2003finished,afterthelot6LA17E)3)Toimportanotherslittingmachine,thentheJ/Rinfectioncanbeavoidedpermanently.(Dec.31,2003)Photo3:StopbarAug29,20038RootCause(2#,6KK04C)NylonAl-filmACcementPolypropyleneStructureofthelaminatedAl-film100umOutsideInsideBecausethereisasmallcrackofAl-film,moisturefromoutsidemaypossiblyenterintothecorethroughnylonlayer,andchemicalreactionoccurswhenitmeetselectrolyte,thengascomeintobeingafteralongtermandcellbecomeswelling.RootcauseofcellswellingisAl-filmbroken.Aug29,200310Countermeasure/Correctiveaction(2#)InordertopreventtheoutflowofbadcellwithAl-filmbroken,wehavestartedtousetheBrightMet

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