Hii, My name is Prateek. I'm a Battery Design and Analysis Engineer. I'm stuck on a small problem and want suggestions from your side.
Problem: There is a 4S2P Li-ion battery pack (18650 cells) that has to be used in the future for the solar-panels motor attachment. There are heating coils of (0.5W) attached on both sides of the cells. so in total, a cell has a heating power input of 1W per cell and 8W for the complete battery pack. The battery pack is inside a box with 6mm insulation (SilicaAerogel Ceramic Fibre Blanket-SACB).
Battery pack Requirements:
Nominal Capacity: 3600mAh
Nominal Energy: 51.84Wh
Output Voltage: 10.8 - 16.4V
Initial Impedance: 110mohm Max (DCR)
Charging mode: CC-CV
Max. Charge Voltage: 16.4V
Charger Max. Charge current: 2A
Charge Temp. Range: 0-60 degC
The target is to find the exact amount of heating power we need to use, to keep the battery above 5 degC during the night in a steady -40 degC environment. The battery will start at 20 degC (the solar panel will operate during the day). Night time in Canada (the location) can be 16 hours in December.
I have tried to perform it in Solidworks but not working as it doesn't even have a cell material library to give battery pack details. Is it possible in the HyperWorks CFD simulator?
Thanks in advance for your time and suggestions and feel free to ask queries.
P.S.: Attached are some photos of the 2S2P pack presently used.