Battery monitor for electric vehicles.docx

UnitedStatesPatent叫Kopera54)BATTERYMONITORFORELECTRICVEHICLES751Inventor:JohnJ.C.Kopcra,RochesterHills,Mich.73Assignee:ChryslerCorporation,AubumHills,Mich.21Appl.No.:820,749221Filed:Mar.19,1997RelatedU.S.ApplicationData62DivisionofSer.No.369,250,Jan.6,1995,Pat.No.5,646,534.51 Int.CL6GOlR31/36;GOIN27/41652 USCl324/434;324/42858FieldofSearch324/426,427,324/428,431,434;320/48;340/636U.S.PATENTDOCUMENTS3.307.1012/1967Byles324/4294,360,76611/1982Bogardus.Jr318/1394.401,9428/1983Renz324/42756ReferencesCited4.484,14o11/1984Dieu324/4344.590.4305/1986Vandenbergheetal324/4274,633,41812/1986Bishop364/5544.931,7386/1990MacIniyreelal324/4355,111,1325/1992Motose322/905,170,12412/1992Blairetal324/4345.250,90410/1993Salanderetal324/4305.270,94612/1993Shibasakietal364/4925,321,6276/19%Reher364/4835,345.3929/1994Mitoetal364/483US(X)5808469AiiPatentNumber:455,808,469DateofPatent:Sep.15,19985.444,3788/1995Rogers324/4285,546.0038/1996Noworolskie(al324/4345.602,4812/1997Fukuyama324/4345.619.4174/1997Kendall364/4835J05.9291/1998Caravelloelal324/4345.712.5681/1998ohreial324/434PrimaryExaminer-IennW.BrownAttorney,Agent,orFinnarkP.Calcaterra57ABSTRACTAbatterymonitorformonitoringthevoltageandtemperatureof(hebatteriesassociatedwithabatterypackofanelectricvehicle.Thebatterymonitorincludesanoptoisolatorthatelectricallyseparatesanisolatedportionofthebatterymonitorconnectedtothebatteriesfromanonisolatedportionofthebatterj,monitor(hattransmitsbatteryvoltageandtemperaturesignalstoavehiclecontrolleroftheelectricvehicle.Thebatterymonitorispositionedproximatetoabatteytubholdingthebatteriesoftheelectricvehiclesothathighvoltagewiresconnectedtothebatterieswithin(hebatterytubarelimitedinlengthforsafetypuoses.Further,alimitednumberofwirestransmittingthebatteryvoltageandbatterytemperaturesignalsfromthebatterymonitortothevehiclecontrollerarerequired.Thebatterymonitorcanincludeamultiplexer(hatselectivelytransmitsthebatteryvoltageandtemperaturessignalstotheoptoisolatorinacontrolledmanner,orcanincludeaseriesofotheropto-isolatorsthattransmithighpowerbatterysignalstoacapacitortobechargedwhere(hechargeonthecapacitorisrepresentativeofthevoltageofaparticularbatterjf.20Claims,2DrawingSheets30io-f-fmco16A/D8USMUXCHANNEL!SftfCTaSWTCHSTLECT+f5V.+5V.-15V.Otf,48AMPIfSOUTORS1*rADDRESSMJCRoPRoCESSOR4TEMP.4046BATTERYTUBCOMMONTEMP.X5141610/°ATTENUATORDIFF.48AMP?“0-IOPTOOo 02 73254BUFFERSA/DISOLATORSTEMP.CoMMoN36MUXCHANNELSELECT&SWITCHSELECT60>powERisuppiy+5v-INFILTERXIO68,66+15V+5V15VBUSJ1QQDQ长12213020Kn8090128TEMP.X5!MUXOPTOISOLATORSXlO100髀ORSdjp102PnFI106108A/DDIFF.114MP,96,ADDRESS=INPUTS9488104TOH2144MICRO120ProcessoRITFig-2140118COMM.BUS15Coo)0BATTERYMONITORFORELECTRICVEHICLESThisisadivisionofU.S.patentapplicationSer.No.08/369,250,filedJan.6,1995,nowU.S.Pat.No.5,646,534.BACKGROUNDOFTHEINVENTION1. FieldoftheInventionThisinventionrelatesgenerallytoabatterymonitorformonitoringthebatteriesofanelectricvehicleand,moreparticularly,toabatterymonitorthatmonitorsthevoltageandtemperatureofthebatteriesofanelectricvehiclewherethebatterymonitorispositionedproximate(othebatteries.2. DiscussionoftheRelatedArtTodaythereisagrowingdemandforelectricvehicleswhichrunonelectricpowerstoredinmultiplebanksofbatteries.Increaseduseofelectricvehicleshasbeenfueledbymanyfactorsincludingconsumerdemand,emissionconcernswithinternalcombustionenginesandincreasedgovernmentalregulations.Becauseofanumberofobviousandindustrj,relatedreasons,itisnecessarytomonitorthevoltageandtemperatureofthebatteriesusedbytheelectricvehicles.Asiswellunderstd,itisdesirabletocontrolthechargingofthebatteriesofanelectricvehicle.Toachievetheoptimumandmostrapidchargingrate,(hevoltageandtemperatureof(hebatteriesmustbemonitoredtoinsurethatthebatteriesdonotoverheatduringthechargingprocedure.Further,itisnecessarytomonitorbatterycapacityduringoperationofthevehicletodetermineexistingbatterycapabilities.Conventionalmethodsformonitoringbatteryvoltageandtemperaturehaveseveraldisadvantages.Forexample,typicalbatterymonitoringdevicesformonitoringbatterjrvoltageuseisolationamplifierstoisolate(hebatteryvoltageandassociatedcurrentfromthemonitoringdevice.Theseisolationamplifiersgenerallyusetransformers,whichareheavyandcostly,toachievetherequiredisolation.Also,knownmonitoringdevicesrequiremultiplewiresattached(oeachbatterythatareroutedthroughoutthevehiclepossiblyprovidingelectromagneticcompatibility(EMC)problemswiththevariouselectricalmodulesusedinthevehicle.Inaddition,somemonitoringdevicesutilizecommongroundingschemeswhichconnectthevehicle'ssup