新能源汽车动力总成的可靠性改进方向探索

新能源汽车动力总成的可靠性改进方向探索ExplorationonReliabilityImprovementofPowertrainforNewEnergyVehicle1/11Presentedby：GaoWenkaiComparisonofDifferientEVsBackgroundGroupDivision2/113/114/11NEVHEVFCEVPEVType2020SalesDomesticMarketShareOilConsu-mption2025SalesDomesticMarketShareOilConsu-mptionEV1mio70%3mio80%FCEV1000AreaOpera-tionEEV5L/100km4L/100kmEEVandNEVMainObjectesPlanning5/11HEVSHEVPHEVSPHEVAdvantages•Reducefuelconsumption•Thedriverneednottochangehabbit•Improvedrivingperformance•ReducenoiseofmechanicalDisadvantages•Technologycostistoohigh•Propertylimitedbydrivingconditon6/11GenerallyFuelcellsinvehiclesgenerateelectricitytopowerthemotor,generallyusingoxygenfromtheairandcompressedhydrogen.Advantages•Zero-emissions•Charginggasquickly•HavinglongerdrivingdistancethanPEVDisadvantages•Technologycostistoohigh•Zero-emissionshydrogenproductionisachanllenge•Storageandtransportationaredifficult7/11Advantages•Zero-emissions•Highutilizationofenergy•Lownoise•SimpleConfigurationofvehicleDisadvantages•Drivingdistanceisshort•Chargingtimeislong•Batterylifeisshort•Technologycostistoohigh8/11TypeHEVFCEVPEVDistanceEmissionChargingTimeOilSavingChargingEquipmentIndustrializationPotentialTechnicalDifficultyVerygoodnormalgoodHEVandPEVhaveadvantagesandpotentialintenyears9/11PowerAssembleBatteryModelBatteryBMSMotorModelMoterMoterControlTransimission10/11MotorControlIn-WheelMotorConfigurationPowerBetteryResearchBetteryManagementSystemMotorStructure11/11Presentedby：ChenXinyue1/7PEV'sRequirementsonBatteriesTheComparisonBetweenDifferentBatteriesReliabilityImprovementofBatteriesOutline2/7EnvironmentalProtectionHighCostPerformanceLong-LifeHighEnergyDensityWhatrequirementsdoPEV’sbatteriesneedtomeet?Comparedtootherbatteries,lithiumbatteryismoreenvironmentallyfriendly,hashighspecificenergy,andthusisthemostpromising.3/7LiFePO4NCM/NCALiCoO2LiMn2O44/7NCANCMLiFePO4LiMn2O4LiCoO2VoltagePlatform3.73.63.23.83.7EnergyDensity＞180160~180120~130130~150150~180CycleLife＞2000＞2000＞2000500~800＞1000CostLowLowHighTheLowestHigherComprehensivePerformanceExcellentExcellentGoodBadGoodAdvantagesHighenergydensity,goodlowtemperatureperformanceElectrochemicalstability,goodcycleperformanceHighsafety,longcyclelifeManganeseisrichinresources,lowprice,goodsecurityStablecharginganddischarging,simpleproductionprocessDisadvantagesPoorperformanceathightemperature,poorsafety,highproductiontechnologyrequirementsThepriceofcobaltisexpensivePoorperformanceatlowtemperature,lowdischargevoltageLowenergydensityandpoorelectrolytecompatibilityThepriceofcobaltishigh,lowcyclelife5/7ReliabilityImprovementProductionCraftElectrolyteCost6/77/7Presentedby：WangXiaorong1/15WhatistheBMS?WhydotheEVsneedBMS?Whatisthedirectionforthereliability?2/15Lithium-ionbatterypackhasmanyproblemssuchasandsoon,whichrestrictsthewideapplicationoflithium-ionbatteryinvehiclefield.Lithium-ionbatterysafeandreliableworkingareaisnarrow,theneedforbatterymanagementsystemforeffectivemanagementandcontrol.WhydotheEVsneedBMS?3/15Lithium-ionbatterysafetyoperatingwindowrangeisnarrow：Reliableoperatingtemperature：-20~55℃Page22Li-ionbatterysafetyoperatingwindowThermalrunawaySafetyvalvetoopen·90-120°CSEIfilmbeginstodecompose,releaseheat,thetemperaturerise·Above120℃,embeddedlithiumreactwiththeelectrolyte,SEIcannotbecutoffthecontactoftheanodeandtheelectrolyte·Temperaturehigherthan200°C,theelectrolytedecomposition,flammablegases·Temperaturehigherthan150°C,LiCoO2breakdownandreleasesoxygen·Separatorbeginsmeltandblock·Temperaturehigherthan160°C,LiNi0.8Co0.15Al0.05O2breakdownandreleasesoxygen·Temperaturehigherthan310°C,LiFePO4Breakdownandreleasesoxygen·Temperaturehigherthan265°C,LiMn2O4oxidatedandreleasesoxygenFire,thetemperaturerosesharply·Overcharge,theformationoflithiumdendrites·Thelowtemperaturecharge,LithiumplatingshortenlifetimeLowvoltage,thenegativeelectrode(anode)copperfoiloxidatedanddissolvedLowtemperature,lowvoltage,cathodedamage,shortcircuittemperatore（°C）voltage（V）246810100200300·Temperaturehigherthan210°C,LiCoxNiyMnzO2breakdownandreleasesoxygen4/15SOCBatteryParameterMonitorSOHSOFFaultsDiagnosisOBDSafetyControlandReportChargingControlBalanceFunctionsSafetyTempretureControlEMCSOEWhatistheBMS?5/15Whatisthedirectionforthereliability?6/157/15TheToyotaPriusfireincident.08.2008ChevroletWolandacaughtfire.05.2011FiskKarmafireincident01.2012Boeing787fireincident01.2013Theaccidentgreatlyhampertheconfidenceofconsumerstoacceptelectricvehicles,hinderthepopularityofelectricvehicles.8/15AirgoinAirgooutAirgoinAirgooutThermalRunawayinBatteryPack机械触发电触发热触发短路产热热失控9/15InternalShortCircuitinBatteryPackISCBatteryinternalself-loop,thecontinuousconsumptionofthebatterypoweriscalledtheshortcircuit.ISC10/1511/15PhenomenonResistantIncreaseCapacityDecayResearchonBatteryDurabilityElementdischargeratechargeratetemperaturecut-offvoltageDurability12/1513/15StatusofHealthEstimatesSOH,thesameasbatterydurability,isoneofthemostimportantstateofthebattery.TheSOHofthebatteryisusuallydefinedbythelossofcapacityofthebattery.Batteryaging.14/15电池性能衰减TheSOFestimationmainlyreferstothe