battery pack design and thermal managementhevpdd.ca/wp-content/uploads/2019/08/eecomobility... ·...
TRANSCRIPT
We acknowledge the support of the NaturalSciences and Engineering Council of Canada(NSERC) which invests annually over $1billion in people discovery and innovation
EECOMOBILITY (ORF) ampHEVPDampD CREATE
We acknowledge the support ofthe Ontario Research FundResearch Excellence Program
Battery Manufacturer LG ChemType Lithium-Ion (LMO) Cell Voltage MaxMin 4230 V Pack Configuration 86S 5PNumber of Cells 430Nominal Cell Voltage 37 V Nominal System Voltage 3182 VRated Pack Capacity 75 Ah Rated Pack Energy 23 kWh Weight of Pack 303 KgCooling Active ndash Liquid Cooling Pack Location Two Sections (1) Behind Rear Seats (2) Under Rear Seats
Constrains and Objectives
Electro-Thermal Model
Main Battery Pack
Secondary Battery Pack
Battery Pack Design and Thermal ManagementCentre for Mechatronics and Hybrid Technology(CMHT)Mechanical Engineering McMaster UniversityRaven Chen
Thermal ModelElectrical Model
119881119881119879119879 = 119881119881119874119874119874119874119874119874 minus 1198811198811 minus 119868119868119877119877119904119904
1198811 = minus1
119877119877111986211986211198811198811 +
11198621198621119868119868
119889119889119879119879119888119888119889119889119889119889
=119876119876119862119862119888119888
+119879119879119904119904 minus 119879119879119888119888119877119877119888119888 119862119862119888119888
119889119889119879119879119904119904119889119889119889119889
=119879119879119894119894119894119894 minus 119879119879119904119904
119862119862119888119888119888119888119894119894119888119888119877119877119888119888119888119888119894119894119888119888+119879119879119904119904 minus 119879119879119888119888119862119862119888119888119888119888119894119894119888119888119877119877119888119888
CurrentCurrent
Temperature
Wherethe second equation describes the dynamicvoltage across the RC circuitparameters 119877119877amp119862119862 119886119886119886119886119886119886 function of SOC and 119879119879
WhereC is heat capacity (JK)R is heat transfer resistance (KW)Q is the rate of heat generated (W)
bull Design and dimension of battery pack based on suitable models
bull General work procedure to select battery technology and battery design constrains
ndash evaluate suitable battery technologies to specify electric and thermal termination
ndash battery management systems to predict state of charge health function
ndash battery thermal management system to operate cooling and heating effectively
Battery designed with ribs can increase the heat transfer rate
Explosive View of a VW PackBattery Parameters
bull The heat can be a source to warm up the cabin in cold weather conditions
Single cell Conduction between cells
Cell provided by NRCType Lithium-Silicon Nominal Cell Voltage 40VNominal Module Voltage 48 V Module Configuration 5 Parallel Strings of 12 Cells in SeriesPack Configuration 7 Modules in Series Number of Cells 420Nominal Pack Voltage 336VRated Pack Capacity 75 Ah Rated Pack Energy 25kWhWeight of Pack Pack Location In front of the vehicle Cooling Air Cooling
bull Locate the pack in the front of a vehicle for improving heat transfer bull Air cooling of a battery creates a high potential for energy savings and heat recovery
Battery pack
bull The operation of most Li-ion cells should be limited to a temperature of 20degC to 40degC
bull Temperature differences between cells should maintain below 5degC
rsaquo119881119881119879119879
- Slide Number 1
-