强制内部短路测试时方法

1、8.3.9设计评估-内部强制短路（电芯）a）要求：对于圆柱电池和方形电池内部强制短路测试不应该起火。厂家应该给出满足这个要求的报告。电池厂家或者第三方测试实验室对电池测试结束后电池厂家应该有一个设计评估。这是国家特定的测试仅仅使用于法国、日本、韩国和瑞士，并且聚合物电池不要求此测试。b）测试：内部强制短路测试在10c和45c（烤箱内部的环境温度）的环境温度下进行，测试按照下面的方法：1）样品的数量：5个二次电池2）充电过程i）充放电条件：电池按照厂家的要求在20±5C的条件下充电，然后在20±5C的条件下，以0.2It的电流包流放电到厂家规定的截止电流。ii）储存过程：测试

2、电池要在表5中的环境温度条件下储存1-4hiii）环境温度：表5-测试电池环境温度a测试项目测试时最低温度测试最高温度b.2.ii10±2C45±2Cb.2.iv10±2C45±2Cb.3.iA5±2C50±2Cb.3.iiA10±5C45±5Ca测试通常在表4的状态卜进行。iv）强制内部短路的充电过程电池应该在表5中的环境温度下，用规定的上限充电电压进行恒流恒压充电，电流降至0.05It时充电结束。3）用一个锲粒子挤压卷心测试需要温控烤箱和特殊冲压设备，匀速移动冲压设备的可移动部件，一旦检测到短路就立即停止。i）

3、测试准备A如表5所述调节好烤箱的温度。样品准备指导如附录A中的部分A.5和图A.5与图A.8。把带有卷芯的铝膜袋和锲粒子放在烤箱内保持45±15min。B从密封包装中移出卷芯，用一个电压测量仪连接电池两端，将热电偶黏贴在卷芯的表面。将卷芯放在冲压设备下，使锲粒子位于冲压夹具下面。注意：为了避免电解液蒸发，在10min内完成从烤箱内移出卷芯到设备安放好并关上烤箱门的动作。C移除绝缘片关闭烤箱门。ii）内部短路A确保卷芯的温度显示符合表5并开始测试B设备的可移动部分的底面是由丁月青橡胶或者亚克力板做成，该可移动部分置于10mmx10mm的不锈钢传动轴上。按压夹具的细节在图2中体现。丁月青

4、橡胶底面是为圆柱电池而制。对于方形电池测试，用5mmx5mm（2mm厚）的亚克力板放在丁月青橡胶上面,装置以0.1/s的速度下移来检测电池的电压。当检测到由于内部短路引起电压下降时，立刻停止下降并保持挤压夹具原位不动30s,然后释放压力。电压在每秒终内要监测超过100次并且如果电压下降50mV,就认为有内部短路发生。如果压力达到800N对于圆柱电池和400N方形电池，立刻停止设备下降并保持原位置。CylindricalJISK6253TypeA)Figure2-JigforpressingC）结果标准：不起火（当电池起火时记录压力）8.3.9Designevaluation-Farcedint

5、ernalshortcircuit(cells)a)RequirementsForcedInternalshortcircuitt号siforcylindricalcellsandprismaticcellsshallnotcausefireCfillmarbijfaciijrfirs宫h胃IIkseparecordtnmsfittherequiremanl.A力白,d巨鼻ignpvaliMtir)nshallbedonebythecellmanufactureraftertestingisconducledbythecellmariufacturerorathirdpart/testhous

6、e.Thiscountry$pecifiGFgSfwhichi$ontypplic&bletoFrance.Japan.KoreaandSwitzerlandandisnotrequiredonpolymercells.t>)TestTheforcedinternalshortcircuitlestisperformedInachamberat+10Cand+45'Cambientinternalchambertemperature)accordingtothefollowingprocedure.1) NumberofsamplesThistestshallbecarr

7、iedoutonfivesecondary(rechargeable)lithiurn-icnceils,2Chargingprocedure1) CondilioningchargeanddischargeThesampleshallbechargedatZQ&C±5accordingtothemanufaciurer$recommendation.Thesampleisthendischargedat20Ci5ataconslantcurrenlof0h24AdowntothefinalvoltagespecifiedbyIhemanufacturer.it)Storag

8、eprocedureTestcellshallbestoredfor1hto4hatanambienttemperatureasspecifiedinTable5.iii) AmbienttemperatureTable5-AmbienttemperatureforcelltestTestitemTestatlowesttesttemperatureTestathighesttesttemperatureb.2.ll10±245±2"Cb.2.iv10±245±2cCb.3.IA5±250±2，Cb.3.iiA10i545&

9、#177;5cCaThetestisconductedusingconditionsinTable4iv) ChargingprocedureforforcedinternalshorttestTestcellshallbechargedatanambienttemperatureasspecifiedinTable5,attheupperlimitedchargingvoltageattheconstantcurrentspecifiedbythemanufacturer,continuechargingatconstantvoltageatupperlimitedchargecurrent

10、dropsto0.05/(A.3)PressingthewindingcorewithnickelparticleTemperature-controlledovenandspecialpressequipmentareneededforthetest.Movingpartofthepressequipmentshallmoveatconstantspeedandcanbestoppedimmediatelywhenshort-circuitisdetected.i) PreparationforthetestAThetemperatureoftheoveniscontrolledasspec

11、ifiedinTable5.SamplespreparationguidanceisprovidedinAnnexA.ClauseA.5andinFigureA5andFigureA.8,Putaluminum-laminatGdbagwithwindingcoreandnickelparticleIntotheovenfor45±15min.BRemovethewindingcorefromsealedpackageandattachterminalsforvoltagemeasurementandthermocouplefortemperatureonthesurfaceofth

12、ewindingcore.Setth©windingcoreunderthepressureequipmenttolocatingthepointoftheplaceofthenickelparticleunderthepressingjigRemark:Topreventevaporationofelectrolyte,finishtheworkwithin10minfromremovingthewindingcorefromtheovenfortemperatureconditioningtoclosingtheovendoorwheretheequipmentIslocated

13、.CRemoveinsulatingsheetandclosetheovendoor.ii) InternalshortcircuitAConfirmthatthewindingcoresurfacetemperatureisasdefinedinTable5andthenstartsthotest.BBottomsurfaceofmovingpartofthepressequipmentismadeofNitrilerubberorAcryl,whichisputonthe10mmx10mmstainlesssteelshaft.Thedetailofpressingjigsshallbos

14、howninFigure2.Nitrilorubberbottomsurfaceisforcylindricalcelltest.Forprismatictest5mmx5mm(2mmthickness)AcrylisputontheNitrilerubber.Thefixtureismoveddownatthespeedof0,1mm/smonitoringthecellvoltage.Whenvoltagedropcausedbytheinternalshort-circuitisdetected,stopdescentimmediatelyandkeeppressingjiginthep

15、ositionfor30sandthenreleasethepressure.Voltageismonitoredmorethan100timespersecondandifvoltageisdroppedmorethan50mVcomparetotheinitialvoltage,itisdefinedtointernalshortcircuithasoccurred.Ifthepressurereaches800Nforcylindricalcelland400Nforprismaticcell,stopdescentimmediatelyandthenkeepintheposition.

16、Cylindrical10mm21，WNitrilerubber("2mm)HardnessA60(JISK6253TypoA)PnsmaticFigure2-Jigforpressingc)AcceptancecriteriaNofire(Recordthepressurewhenshort-circuitoccurrediftherewasnofire.)A.5SamplepreparationA.5.1GeneralInordertoprovidemoreinformationregardingthesamplepreparationfortest8.3.9thefollowi

17、ngadditionaldetailsareprovided.A.5.2InsertionprocedurefornickelparticletogenerateinternalshortTheinsertionprocedureiscarriedoutat2015andunder-25ofDEWpoints.A.5.3DisassemblyofchargodcellRemovewindingcore(assembledelectrod和separator,roll,andcoil)fromthechargedcell(SeeFigureA.5andFigureA8).A.5.4Shapeof

18、nickelparticleTheshapeofnickelparticleshallbeasshowninFigureA.2.Dimensions:Height:0.2mm;Thickness:0.1mm;Lshape(Angle:90±10°):1.0mmforeachsidewith5%tolerance.Material:morethan99%(massfraction)purenickelDimensionsinmillimeters01FigureA.2-ShapeofnickelparticleA.5.5Insertionofnickelparticletoc

19、ylindricalcellA.5.5.1Insertionofnickelparticletowindingcorea)Insertionofnickelparticlebetweenpositive(activematerial)coatedareaandnegative(activematerial)coatedareaforcylindricalcell,(seeFigureA.5)1) Ifouterturnofpositivesubstrateisaluminumfoil,cutofffoilatthedividinglinebetweenaluminumfoilandactive

20、materialforactivematerialtoactivematerialshorttest,2) Insertnickelparticlebetweenpositiveactivematerialandseparator.ThealignmentofnickelparticleshallbeasshowninFigureA.3Positionoftheinsertionofnickelparticleshallbeat20mmfromedgeofthecutaluminumfoil.DirectionofL-shapedcorneristowardsthedirectionofwin

21、ding.WidthFigureA.3-NickelparticleInsertionpositionbetweenpositiveandnegativeactivematerialcoatedareaofcylindricalcellInsertionofnickelparticlebetweenpositivealuminumfoil(uncoatedarea)andnegative(activematerial)coatedareaforcylindricalcell.Whenaluminumfoilofpositiveelectrodeisexposedatouterturnandth

22、ealuminumfoilisfacingthecoatednegativeactivematerial,followingprocedureshallbeused.1) Whenaluminumfoilofpositiveelectrodeisexposedatouterturn,cutoutthealuminumfoilat10mmfromthedividinglinebetweenaluminumfoilandactivematerial.2) InsertNiparticlebetweenaluminumfoilandseparator.Thealignmentofnickelpart

23、icleshallbeshowninFigureA.4.Positionoftheinsertionofnickelparticleshallbeat1,0rrmfromtheedgeofthecoatingofpositiveactivematerialonaluminumfoil.FigureA.4-NickelparticleinsertionpositionbetweenpositivealuminumfoilandnegativeactivematerialcoatedareaofcylindricalcellPositivetabNegativelabInsulatingsheet

24、22G42FigureA.5-DisassemblyofcylindricalcellA.5.5.2MarkthepositionofnickelparticleonthebothendofwindingcoreoftheseparatorTheprocedureisasfollowsa) Placeinsulatingsheetbetweentheseparatorthatisfacingtonickelparticleandthenegativeelectrodetoprotectagainstshort-circuitsb) Manuallyrollbacktheelectrodesan

25、dseparatorkeepingthenickelparticleinplaceandapplyadhesivetapetothewindingcore.c) Markpositionofthenickelparticleacrossthewindingcore.d) Putwindingcoreinapolyethylenebagwithsealingzipperandsealit.Putthepolyethylenebagintoaluminum-laminatedbagtopreventfromdryingout.Remark:Procedureshallbecompletedwith

26、in30min.A.5.6Insertionofnickelparticletoprismaticcella) Priortoinsertingnickelparticle,insertaninsulatingsheetbetweenthenegativeelectrodeandtheseparatorthatisbelownickelparticleandthenegativeelectrode,asshowninFigureA.6.toprotectagainstshort-circuit.b) Insertionofnickelparticletowindingcore1) Insert

27、ionofnickelparticlebetweenpositive(activematerial)coatedareaandnegative(activematerial)coatedareaforprismaticcell.(seeFigureA8)i) Insertnickelparticlebetweenpositive(activematerial)coatedareaandseparatororbetweenseparatorandnegative(activematerial)coatedarea.Incaseofaluminumcellenclosure,insertnicke

28、lparticlebetweenpositive(activematerial)coatedareaandseparator.ii) Insertnickelparticlebetweenpositiveactivematerialandseparator.ThealignmentofnickelparticleshallbeshowninFigureA.6.Nickelparticleissetatthecenter(diagonally)ofthewindingcore.DirectionofnickelparticleL-shapecorneristowardsthedirectiono

29、fwinding.PosliveAlfoilNiparticlePositiveacbvematerialcoatedSeparator/£C2?W2FigureA.6-Nickelparticleinsertionpositionbetweenpositiveandnegative(activematerial)coatedareaofprismaticcell2)Insertionofnickelparticlebetweenpositivealuminumfoil(uncoatedarea)andnegative(activematerial)coatedareaforpris

30、maticcell.WhenaluminumfoilofpositiveelectrodeIsexposedatouterturnandthealuminumfoilisfacedtocoatednegativeactivematerial,thefollowingtestshallbeperformed:i) Thealuminumfoilofpositiveelectrodeisexposedatouterturnandthealuminumfoilisfacedtocoatednegativeactivematerial,insertnickelparticlebetweenaluminumfoilandseparator;ii) Thealignmentofnickelpar