I am currently using the PDE tool box to model the thermal behavior of a cylindrical lithium-ion battery (2D,x-y). The main experiment consists on cycling a battery inside a climatic chamber. The cell has a heat generation which is used as InternalHeatSource (Joule heat [W]) and the heat exchange with the climatic chamber is only done by convection.
After running the model, I got some weird results which I suspect are due to the internal heat generation or boundary conditions functions. As a result, I would like to know if the following settings are correct:
- Thermal prorperties : Thermal conductivities given as c=[kx ; ky] [W/ m.K], Density [W/m^3], specific heat capacity [J/ kg.K], geometry in [m]
- Boundary conditions : Convection coefficient h [W/m^2], (equal to 10(natural convection) in my case) and Ambient Temperture [°C]
thermalBC(Thermal,'Edge',[1 2 3 4], 'ConvectionCoefficient',10,'AmbientTemperature',25)
- Internal heat generation: The value (heatSourceValue) is given to internalHeatSource in [W/m^3]
HeatSource= @(region,state) heatSourceFun(region,state,IntHeat);
function heatSourceValue = heatSourceFun(region,state,IntHeat)
elseif state.time<= max(IntHeat(:,1))
When I look at the results, the temperature estimations given by the model are considerably higher than the results measured by the surface-mounted thermocouples.
Thanks in advance,