新能源汽车动力总成的可靠性改进方向探索

1、1Exploration on Reliability Improvement of Powertrain for New Energy Vehicle1/112Outline Comparison of Differient EVsBackgroundGroup Division2/113Development of New Energy Vehicles 3/114Background of Automotive Industry 4/11510 Years Strategic Target Type2020 SalesDomestic Market ShareOil Consu-mpti

2、on2025 SalesDomestic Market ShareOil Consu-mptionEV1mio70%3mio80%FCEV1000Area Opera-tionEEV5L/100km4L/100kmEEV and NEV Main Objectes Planning5/116Hybrid Electric Vhicle(HEV) AdvantagesReduce fuel consumptionThe driver need not to change habbit Improve driving performanceReduce noise of mechanicalDis

3、advantagesTechnology cost is too highProperty limited by driving conditon6/117Fuel Cell Electric Vehicle(FCEV) GenerallyFuel cells in vehicles generate electricity to power the motor, generally using oxygen from the air and compressed hydrogen.AdvantagesZero-emissionsCharging gas quicklyHaving longe

4、r driving distance than PEVDisadvantagesTechnology cost is too highZero-emissions hydrogen production is a chanllengeStorage and transportation are difficult7/118Pure Electric Vehicle (PEV) AdvantagesZero-emissionsHigh utilization of energyLow noiseSimple Configuration of vehicleDisadvantagesDriving

5、 distance is shortCharging time is longBattery life is shortTechnology cost is too high8/119TypeHEVFCEVPEVDistanceEmissionCharging TimeOil SavingCharging EquipmentIndustrialization PotentialTechnical DifficultyCompare Very goodnormalgoodHEV and PEV have advantages and potential in ten years9/1110Pur

6、e Electric Vehicle (PEV) 10/1111Group Division 11/1112Presented by：Chen Xinyue1/713PEVs Requirements on BatteriesThe Comparison Between Different BatteriesReliability Improvement of BatteriesOutline2/714Environmental ProtectionHigh Cost PerformanceLong-LifeHigh Energy DensityWhat requirements do PEV

7、s batteries need to meet?Compared to other batteries, lithium battery is more environmentally friendly, has high specific energy, and thus is the most promising.3/715LiFePO4NCM/NCALiCoO2LiMn2O44/716NCANCMLiFePO4LiMn2O4LiCoO2Voltage Platform3.73.63.23.83.7Energy Density180160180120130130150150180Cycl

8、e Life2000200020005008001000CostLowLowHighThe LowestHigherComprehensive PerformanceExcellentExcellentGoodBadGoodAdvantagesHigh energy density, good low temperature performanceElectrochemical stability, good cycle performanceHigh safety, long cycle lifeManganese is rich in resources, low price, good

9、securityStable charging and discharging, simple production processDisadvantagesPoor performance at high temperature, poor safety, high production technology requirementsThe price of cobalt is expensivePoor performance at low temperature, low discharge voltageLow energy density and poor electrolyte c

10、ompatibilityThe price of cobalt is high, low cycle life 5/717Reliability ImprovementProduction CraftElectrolyte Cost6/7187/719Presented by：Wang Xiaorong1/1520What is the BMS ?Why do the EVs need BMS ?What is the direction for the reliability ?2/1521Lithium-ion battery pack has many problems such as

11、and so on, which restricts the wide application of lithium-ion battery in vehicle field. Lithium-ion battery safe and reliable working area is narrow, the need for battery management system for effective management and control.3/1522Lithium-ion battery safety operating window range is narrow：l Relia

12、ble operating temperature：l -2055 4/1523SOCBattery Parameter MonitorSOHSOFFaults Diagnosis OBDSafety Control and ReportCharging ControlBalanceFunctions SafetyTempreture ControlEMCSOEWhat is the BMS ?5/1524 6/15257/1526BackgroundThe Toyota Prius fire incident. 08.2008Chevrolet Wolanda caught fire. 05

13、.2011Fisk Karma fire incident01.2012Boeing 787 fire incident01.2013p The accident greatly hamper the confidence of consumers to accept electric vehicles, hinder the popularity of electric vehicles.8/1527Air go inAir go outAir go inAir go outThermal Runaway in Battery Pack 机械触发机械触发电触发电触发热触发热触发短路产热热失控

14、热失控9/1528Internal Short Circuit in Battery Pack ISC Battery internal self-loop, the continuous consumption of the battery power is called the short circuit.ISC10/152911/1530PhenomenonResistant Increase Capacity DecayResearch on Battery DurabilityElementdischarge ratecharge ratetemperaturecut-off vol

15、tageDurability12/153113/1532Status of Health Estimates SOH,the same as battery durability, is one of the most important state of the battery. The SOH of the battery is usually defined by the loss of capacity of the battery. Battery aging.14/1533电池性能衰减The SOF estimation mainly refers to the available

16、 output powerState of Function 15/1534Presented by：Qiao Dongdong1/1235OutlineRequirementsMotor Industry Status QuoThe Selection of MotorReliability of Motor2/1236 Vibration Cooling Sealing Requirements3/1237Permanent Magnet Synchronous MotorAsynchronous MotorMotor Industry Status Quo4/1238Performanc

17、e and TypeDCMDCMAMAMPMSMPMSMSRMSRMSpeed Range/rpm4000-600012000-200004000-1000015000Power DensityLowMiddleHighHigherWeightHeavyMiddleLightLightVolumeBigMiddleSmallSmallReliabilityBadGoodGoodGoodStructural RobustnessBadGoodGoodGoodThe Controller CostLowHighHighGeneralComparison of PerformanceThe Perm

18、anent Magnet Synchronous Motor The Selection of Motor5/1239 The stator The permanent magnet rotor The cover and the shellThe Structure of PMSM6/1240 The vibration of PMSM The sealing of PMSM The heat dissipation of PMSMThe Reliability of PMSM7/1241 Electromagnetic torque vibration Mechanical vibrati

19、on The road excitation vibration The Vibration of PMSM8/1242 Increased mechanical wear Change magnetic gap Reduce the magnetism of permanent magnetNormal movementAbnormal movementThe Vibration Effect of PMSM9/1243The Heat Source Copper loss Iron loss Mechanical friction The Cooling Way Air cooling（

20、rotor） Water cooling （ stator）The Cooling and Sealing of PMSM 10/1244Forced CoolingCoordination of Sealing and Heat DissipationConflict of Sealing and Heat Dissipation Sealing CoolingThe Cooling and Sealing of PMSM 11/1245Rotor CoolingStator CoolingWater Piping Arrangement Z glyphSpiralThe Structure

21、 of Cooling System 12/1246Presented by：Dai Lei1/947Outline2/9483/949Why In-Wheel Motor? Simplified , lightweight Connected by the soft cable, more flexible. Improve the efficiency. Reduce the noise, improve the cars ride comfort. The energy recovery efficiency of the braking system is significantly

22、increased4/9505/951Some New Technical ChallengesIncrease the cars unsprung massesMotor will withstand a large impact load on the roadWheel internal space is limitedCooling and sealing protection problems6/952Two types of In-Wheel MotorTypeRotating SpeedRotor ArrangementDisadvantagesAdvantagesDeceler

23、ated DriveHighInternalHeavy &Working NoiseEfficient &Low CostDirect DriveLowExternalHigh Cost&Low EfficiencyStructure Simplification &Fast Response7/9538/954ProblemDirectionUnsprung massOptimize the structure, LightweightThe impact of the motor from the road surface loadImprove the m

24、otors seismic capacity，Set the active vibration damping deviceTorque fluctuations Torque ripple suppressionCorrosion of the wheel motorImprove the production processThe Exploration of Directions of Improvement9/955Presented by：Zheng Tengfei1/856 Permanent magnet synchronous motor control system The function of the controller Control technology of permanent magnet synchronous motor The reliability of the controller design and explorationOutlineOutline2/857PMSM Control SystemConditioning circuitTorque SensorEncoder Electronic ThrottleSelector SwitchSpeed SensorPre