thermal analysis for ev battery cooling systems by using...
TRANSCRIPT
Thermal analysis for EV battery cooling systems by using AcuSolve
7th July 2015 Dr S Lin
Jaguar Land Rover
Contents 1. Electrical vehicle battery pack cooling
strategies 2. System thermal modelling 3. AcuSolve used for CFD modelling in
research projects 4. Conclusions
Cooling Strategies - Air Cooling
Ford C-Max Energi
Audi Q5
Mitsubishi i-MiEV
Used to cool prismatic and pouch cells
Draws in cabin air via a centrifugal suction fan, may include A/C evaporator
Cooling Strategies – Liquid Cooling
Chevrolet Volt Audi A3 e-tron
• Liquid is water/glycol cooled by low temperature radiator and/or A/C chiller.
• Typically pouch cells cooled by plates between cells, prismatic cells cooled by a base plate, and cylindrical cells cooled by a tube formed to wrap the cylindrical surface.
Cooling Strategies – Refrigerant Cooling • Cylindrical or prismatic cells cooled at their base by an evaporator
plate. Used by BMW & Mercedes for MHEVs, and BMW i3 BEV
Mercedes S400 Bluehybrid
BMW ActiveHybrid 7 BMW i3
System thermal modelling - for battery cooling system design across mild hybrids (MHEV), plug-in
hybrids (PHEV) and battery electric vehicles (BEV).
Concept of liquid cooling of cylindrical cells
AcuSolve used to simulate flow and heat transfer of liquid cooling within a battery pack module
AcuSolve used to evaluate different cooling method /design within a battery pack module
A simple procedure for using AcuSolve to simulate flow and heat transfer in research
Input geometry (STP format) from designer into HyperMesh, fix geometry and export Parasolid or Nastran file
Read Parasolid or Nastran file into AcuSolve and generate mesh
Define model and BCs in AcuSolve
Run model in AcuSolve
Obtain required results in AcuFieldView
Create report in Word or Power Point
Conclusions
• AcuSolve has been used successfully for cooling solution
selections in junction with system modelling.
• In the research projects, AcuSolve models were created to
establish coolant pressure drop correlations.
• This enables pressure drop to be accurately predicted for any
flow rate and temperature within system modelling.
• The mathematical pressure drop correlations created through
AcuSolve, were also used as an input in the Matlab/Simulink
system model.