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6111Vol61No11201011CIESCJournalNovember2010于申军,周永超,李贺,陈志奎(,300384):,,,,,,,,,:;;;;:TM9129:A:0438-1157(2010)11-2960-05EffectofinternalresistancedifferenceonsafetyperformanceoflithiumionbatterypackYUShenjun,ZHOUYongchao,LIHe,CHENZhikui(TianjinLishenBatteryJointStockCo,Ltd,Tianjin300384,China)Abstract:Effectofinternalresistancedifference(IRD)onthesafetyperformanceoflithiumionbatterypackwithdifferentattendedmodeswasinvestigatedThetestingindicatedthatwithincreaseofcycletimes,forcellwithIRDitsinternalresistanceandhousingtemperatureincreasedgraduallyandthedischargecapacitydecreasedunceasingly,leadingtocontinuousenlargementofIRDandthefailureofthecellatlastTheseresultsindicatedthatIRDisanimportantfactoraffectingthesafetyperformanceforlithiumionbatterypackComparedwithnormalcell,foracellpack,thebiggertheIRDtheworsethesafetyperformanceThesafetyperformanceisbetterforthepackwithparallelconnectionthanforthatwithseriesconnectionKeywords:lithiumionbattery;batteriespack;safety;internalresistance;overcharge2009-12-23,2010-03-17::(1964),,,:(09JCYBJC07200),DVD,,18650[16][714],,,,Receiveddate:2009-12-23Correspondingauthor:DrLIHe,lihe9701@126comFoundationitem:supportedbytheNaturalScienceFoundationofTianjin(09JCYBJC07200).[15],,11118650,LiCoO2PVDF(9532),PVDF(9442),10mol!L-1LiPF6/EC+EMC+DEC(111),CelgardPP/PE/PP12,,:22(2S2P);22(2P2S),,1Cell1Cell2Cell3,Cell4,,113ArbinBT2000,84~60V,2AAX1242ND/MAX2550X,40kV,100mA,5∀~80∀221,,Cell1Cell2Cell3,Cell4,Cell42Cell4,,Cell4,2S2PCell4(Pack4),400,Cell4Pack3Cell41(1305m);,2P2S,2Cell4Fig2RelationcurvesbetweencyclenumberandinternalresistanceofCell4inbatterypack!2961!11:1Table1InternalresistancesofsinglecellinbatterypackbeforeandaftercycletestConnectionmethodPackInternalresistanceofcell/mBeforecycletestCell1Cell2Cell3Cell4After400cyclestestCell1Cell2Cell3Cell42S2PPack1486482483493(0)756752745769(0)Pack2478484476524(63%)744767737922(199%)Pack349349487588(193%)7737557261305(691%)Pack4485476494632(282%)766736754explosion2P2SPack5483481482493(0)751749743768(0)Pack6480476485536(89%)744749796869(132%)Pack7486482474588(195%)751740824976(271%)Pack8491496481617(254%)758770895leakagePack7Cell460%(976m)22,,,,,3,,Cell4,3Cell4Fig3RelationcurvesbetweencyclenumberandtemperatureofCell4inbatterypack,Pack4Cell4,2P2SPack8Cell480#,,2S2PPack4,23,,(U=IR),,4Cell4,,Pack1Pack5,42V,2S2PPack4,Cell435049V,,Cell42P2SPack8Cell445V,,45V,,2S2P(1),,Cell2Cell4,Cell4,,24,!2962!614Cell4Fig4RelationcurvesbetweencyclenumberandchargeterminationvoltageofCell4inbatterypack,Cell442V,Cell242V,,(1),Cell4Cell1Cell3Cell4,,,,,2P2S(1),Cell3Cell4,Cell1Cell2,Cell4,Cell3Cell42S2P,Cell3Cell4,Cell4,2P2S2S2P12P2SCell3Cell45Cell4,,,2S2P193%Cell42200mA!h1241mA!h,43%,2P2SCell432%,,(SEI),,,,282%254%,2S2P,2P2S,,XRD5Cell4Fig5DischargecapacityofCell4inbatterypackbeforeandaftercycletest242S2P,2P2SXRD,6,NaFeO2,(003)(101)(104),,,(003),!2963!11:6XRDFig6XRDpatternsofcathodepowderfromdifferentbatteriesacathodeofleakagecell;bcathodeofgeneralcell,(003),,LiCoO2,,LiCoO2,,Bragg:2dsin=k!,d,,LiCoO2(003)LiCoO23,,,,,,References[1]MengRui(),QiuRuizhen(),GaoJunkui().DevelopmentandstudyonpropertiesofpowertoollithiumionbatteryChineseJournalofPowerSources(),2007,31(1):3033[2]FellneraJP,LoeberaGJ,SandhubSSTestingoflithiumion18650cellsandcharacterizing/predictingcellperformanceJournalofPowerSources,1999,81/82:867871[3]ZhangSS,XuK,JowTRChargeanddischargecharacteristicsofacommercialLiCoO2based18650LiionbatteryJournalofPowerSources,2006,160(2):14031409[4]NagasubramanianGTwoandthreeelectrodeimpedancestudieson18650LiioncellsJournalofPowerSources,2000,87(1/2):226229[5]RamadassP,HaranB,WhiteR,PopovBNCapacityfadeofSony18650cellscycledatelevatedtemperatures(∃):CyclingperformanceJournalofPowerSources,2002,112(2):606613[6]NingG,HaranB,PopovBNCapacityfadestudyoflithiumionbatteriescycledathighdischargeratesJournalofPowerSources,2003,117(1/2):160169[7]SpotnitzR,FranklinJAbusebehaviorofhighpower,lithiumioncellsJournalofPowerSources,2003,113(1):81100[8]BalakrishnanPG,RameshR,KumarTPSafetymechanismsinlithiumionbatteriesJournalofPowerSources,2006,155(2):401414[9]XiangHF,XuHY,WangZZ,ChenCHDimethylmethylphosphonate(DMMP)asanefficientflameretardantadditiveforthelithiumionbatteryelectrolytesJournalofPowerSources,2007,173(1):562564[10]TangZhiyuan(),LiuQiang(),ChenYuhong(),HeYanbing().ApplicationofcyclohexylbenzeneasoverchargeprotectionadditiveinlithiumionbatteriesJournalofChemicalIndustryandEngineering(China)(),2007,58(2):476480[11]ZengYuqun,WuKai,WangDeyu,WangZhaoxiang,ChenLiquanOverchargeinvestigationoflithiumionpolymerbatteriesJournalofPowerSources,2006,160(2):13021307[12]MandalBK,PadhiAK,ShiZhong,ChakrabortyS,FillerRThermalrunawayinhibitorsforlithiumbatteryelectrolytesJournalofPowerSources,2006,161(2):13411345[13]AbrahamDP,RothEP,KosteckiR,MccarthyK,MaclarenS,DoughtyDHDiagnosticexaminationofthermallyabusedhighpowerlithiumioncellsJournalofPowerSources,2006,161(1):648657[14]ChenYS,HuCC,LiYYTheimportanceofheatevolutionduringtheoverchargeprocessandtheprotectionmechanismofelectrolyteadditivesforprismaticlit