HP Generic Cell Qual Test SpecRev107.docx
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HP Generic Cell Qual Test SpecRev107.docx
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HPGenericCellQualTestSpecRev107
Lithiumion,lithiumionpolymerandthinadvancedlithiumioncellqualificationtestspecification
Revision1.07
June19,2009
DocumentRevisionHistory
Date
Rev
Description
08/01/02
1.00
Initialrelease
10/17/02
1.01
ChangedtoHPformat
12/03/02
1.02
Added60degCcyclelifetest,andaddeddatasummarytablesfordifferenttemperaturecyclelifetests.
04/01/03
1.03
Corrected2.6.3toread“Cycle#2”.
Addedpictureto3.4andlistedalternatefoaminsulationmaterial.
ClarifiedparameterspagewithC-Rateequivalencyanddefinitionof“N/A”.
04/03/03
1.04
Revisedheadertoincludecellandmanufacturerinformation.AddedAppendix2,celldesignandmanufacturingprocessinformationsummarytable.
04/10/03
1.05
MadeprocessadditionstoAppendix2.ConvertedtablesinAppendix1toExceltableswithformulas.Changed2.1toread,“Four…packsareassembled”.Addedcommentto3.1regardinghandheldapplicationsafetytesting.
04/20/06
1.06
Changedto2P3Sin2.1.Loweredhightemperaturecyclingrequirementsin2.4and2.5.Changedclosedfoaminsulationthicknessin3.4.ChangedAppendixAtoincludethefollowing:
60changedto55ºC;Powersupplyvoltageforoverchargetestis18.5V.
06/19/09
1.07
Changed40ºCto45ºCforcyclelifetesting
1.
Scope
Thistestspecificationdescribestheproceduresusedtoevaluatethecycleperformanceofacorepack(orsoftpack)ofcellsandthesafetyperformanceofindividualcells.Thisdocumentappliestolithiumion,lithiumionpolymerandthinadvancedlithiumioncellsusedinHPnotebookandhandheldproducts.
2.Corepackcyclelifeperformance
2.1.Packconfiguration
CellsareconnectedintoanXPbyYSmatrix,where
XP=thenumberofcellsconnectedinparallel,and
YS=thenumberofcellsinseries
Forexample;2P3S(twocellsinparalleland3cellsinseries),1P4S,2P3S,etc.
Foursuchcorepacksareassembledforcyclelifetesting.
2.2.Measuredparameters
2.2.1.Voltage
Measureandrecordthetotalvoltageofthecorepackvs.timethroughoutthecyclelifetest.
Measureandrecordthevoltageofeachbankofparallelcellsinthecorepack.Ifthetestequipmentiscapable,aback-upchargeterminationconditionissettoVov,andchargeisterminatedifanyonebankofparallelcellsexceedsthisvalue.Likewise,ifpossibleaback-updischargeterminationissetatVuvtostopdischargeifanyonebankofparallelcellsgoesbelowthisvalue.
Thecorepacksarechargedbyaconstantcurrent,constantvoltage(CCCV)method,andtheyaredischargedateitherconstantcurrentorconstantpoweraccordingtothetestprocedure.
2.2.2.Current
Measureandrecordthecurrentgoingintoandoutofthecorepackvs.timethroughoutthecyclelifetest.
2.2.3.Temperature
Measureandrecordthetemperatureofacellnearthecenterofthecorepackvs.timethroughoutthecyclelifetest.
2.3.Calculatedvalues
Calculateandrecordcapacity(Ah)goingintoandoutofthecorepackvs.time,andenergy(Wh)goingintoandoutofthecorepackvs.timethroughoutthecyclelifetest.
2.4.Chargeanddischargetemperatureconditionsforcorepackduringcyclelifetest
2.4.1.Cycleonecorepackinanenvironmentalchambersetat
10oC,+/-2oC.
2.4.2.Cycleonecorepackinanenvironmentalchambersetat
25oC,+/-2oC,orinaroomwhoseambienttemperatureremainsnearthisvalue.
2.4.3.Cycleonecorepackinanenvironmentalchambersetat
45oC,+/-2oC.
2.4.4.Cycleonecorepackinanenvironmentalchambersetat
55oC,+/-2oC.
2.5.Passcriteriaforcorepackcyclelifetest
Acorepackisconsideredtohavepassedthecyclelifeperformanceportionofthequalificationtestif:
2.5.1.Foracorepackscycledat25oC,45oC
Theenergy(Wh)deliveredatcycle#300isgreaterthanorequalto80%oftheenergy(Wh)deliveredatcycle#3
2.5.2.Foracorepackcycledat55oC
Theenergy(Wh)deliveredatcycle#300isgreaterthanorequalto70%oftheenergy(Wh)deliveredatcycle#3
Anexceptionwillbemadeforlowcapacityconsumercells.Forthesecells,60%oftheWhdeliveredatcycle#3willbeacceptable.
2.5.3.Foracorepackscycledat10oC
Theenergy(Wh)deliveredatcycle#300isgreaterthanorequalto50%oftheenergy(Wh)deliveredatcycle#3
2.6.Corepackcycletestprocedure
2.6.1.Cycle#0
DischargeatIndconstantcurrenttoVeod
Restfor15minutes
2.6.2.Cycle#1
ChargeatIncconstantcurrenttoVcl.TerminatechargewhencurrenttaperstoIct
Restfor15minutes
DischargeatIndconstantcurrenttoVeod
Restfor15minutes
2.6.3.Cycle#2
ChargeatIncconstantcurrenttoVcl.TerminatechargewhencurrenttaperstoIct
Restfor15minutes
DischargeatICconstantcurrenttoVeod
Restfor15minutes
2.6.4.Cycle#3through#300
ChargeatIscconstantcurrenttoVcl.TerminatechargewhencurrenttaperstoIct
Restfor15minutes
DischargeatPsdconstantpowertoVeod
Restfor15minutes
Repeatupto300cycles
2.6.5.Optionalperiodicdischargevariationsforcycle#3through#300.
Sometimesitisdesirabletoperiodicallymonitortheenergydeliveredbyapackwhendischargedataratedifferentthanthestandarddischargerate.Ifrequired,Appendix1willlistparameterstobeappliedtothissectionofthecyclelifetestregimefromcycle#3throughcycle#300.
RepeatthefollowingchargeanddischargeeveryNcyclesasdescribedinAppendix1forthecellsundertest.
ChargeatIascconstantcurrenttoVcl.TerminatechargewhencurrenttaperstoIct
Restfor15minutes
DischargeatPasdconstantpowertoVeod
Restfor15minutes
Returntotestparameterssetinparagraph2.6.4forthenext
(N-1)cycles.RepeateveryNcycles
3.Cellsafetyperformance
3.1.Un-cycledcellsafetytestoverview
TestName
TestTemperature
(Cell)
TestCurrent
PowerSupplyVoltage
TestDuration
(Hours)
Numberofcellstested
UC1Overcharge
25oC
IOC1
Vps
ET1
3
UC2Overcharge
25oC
IOC2
Vps
ET2
3
UC3Overcharge
25oC
IOC3
Vps
ET3
3
Overchargetestsareperformedonindividualcellsfornotebookapplications.Atotalofnineoverchargetestsareperformedforagivencellmodel.
Theoverchargetestproceduresvaryslightlybetweencylindricalandprismaticlithiumioncells,andlithiumionpolymerorthinadvancedlithiumioncells.Thelithiumionpolymerandthinadvancedlithiumioncellssometimesrequirethemechanicalconstraintofthefinalbatterypacktopreventthemfromdistortingandburning.Ifsuchconstraintisrequiredtopassthetest,itshouldbenotedalongwiththeoverchargetestresults.
Overchargetestsforhandheldapplicationsshouldbeperformedoncorepacksofcells(lessprotectioncircuitry)astheywouldbeconfiguredinthefinalapplication.Thecurrent,voltageandconfigurationinformationforthesetestsshouldbenotedalongwiththeoverchargetestresults.
3.2.Measuredparameters
3.2.1.Weight
Measureandrecordcellweightbeforeandaftertheoverchargetest.
3.2.2.Voltage
Measureandrecordcellvoltagevs.timethroughouttheoverchargetest.
3.2.3.Current
Measureandrecordthecurrentgoingintothecellvs.timethroughouttheoverchargetest.
3.2.4.Temperature
Measureandrecordthecelltemperaturevs.timethroughouttheoverchargetest.
3.3.Cellstateofcharge
Thecellsthatareusedforthesesafetytestsarebroughtto100%stateofchargeunderstandardchargeconditionspriortothestartofthetest.
3.4.Cellthermalenvironment
Thesafetytestsareperformedonindividualcellsatroomtemperature.ThecellsarewrappedwithasinglelayerofFiberglasinsulation.Thisinsulationshouldbeapproximately1.0inch(25mm)thickinitsuncompressedstate.Alternatematerialisclosedcellfoamapproximately12mmthick(seephoto).
3.5.Passcriteriaforsafetytests
Acellisconsideredtohavepassedagivensafetytestifallofthefollowingconditionsaremet:
3.5.1.Nosmokeisemittedfromthecell
3.5.2.Nofireisemittedfromthecell
3.5.3.Lessthan0.2weightpercentofthecellcontentsislost
3.6.Cylindricalandprismaticlithiumionliquidelectrolytecellprocedure
3.6.1.Placethefullychargedcellinafumehoodthatprovidesadequateventilationincasethecellventsorburns.Connectthepowersupplyandoverchargethecellforthespecifiedperiodoftime.
3.7.Lithiumionpolymerandthinadvancedlithiumioncellprocedure
3.7.1.Placethefullychargedcellinafumehoodthatprovidesadequateventilationincasethecellventsorburns.Connectthepowersupplyandoverchargethecellforthespecifiedperiodoftime.Initiallyperformthistestwiththecellunconstrainedonthebench.
3.7.2.Ifthecellburns,repeatthetestwithapieceofPlexiglasorotherrigidmaterialplacedoverthecelltosimulateabatterycasethatconstrains,orrestricts,theexpansionofthecellinthethicknessdimension.Reportthisoranyotherconditionrequiredtopasstheoverchargetest.
AppendixA–CelltestparametersandTestResultsSummary
Chemistry(Anode/Cathode)
Graphite/CobaltOxide
NominalVoltageofcell(V)atC/5discharge
permanufacturer
3.7
NominalEnergyofcell(Wh)atC/5dischargepermanufacturer
Cellweight(g)
Parameter
Value
Description
XPYS
Parallelbyseriescorepackconfigurationmatrix
Vcl
4.2
Packchargeclampvoltage(V)
Veod
3.0
Packdischargecutoffvoltage(V)
Vov
4.35
Cellovervoltagecutoff(V)
Vps
18.5
Powersupplyvoltage(V)foroverchargetest
Vuv
2.75
Cellundervoltagecutoff(V)
Iasc
N/A
Alternatespecifiedpackchargecurrent(mA)
IC
PackC-Rate(mA)forthecellundertest
Ict
P
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