Thermal Failure Criteria of the Battery Box
Temperature Limit of System: 45 °C
Reaching this limit will disable regen and solar for a short time until the pack is cool.
This value was determined based on the LG MJ1 (Rechargeable Lithium-Ion Battery) Datasheet. It can be found in Appendix 1 of the ASC 2021 VDR Battery Tech Report.
Battery Box Cooling Requirements - ASC Regs
Assembly, geometry, and material properties of the battery box
This page summarizes materials used in the battery box and their associated thermal characteristics → Specific Heat Capacity of the Battery Pack
Also summarized below
Component | Material | Thermal Conductivity (W/ m K) | Specific Heat Capacity (J/kg K) | Mass (kg) |
|---|---|---|---|---|
LG MJ1 18650 | assume uniform temp within 18650s | 830 | 41.5 (48 g* 864 cells) | |
Nickel | 90 | 440 | 0.8 | |
EMS Sigma 60 | 200 | 400 | ||
Acetal | 0.3-0.37 | 1400-1500 | ||
Fish Paper | 0.29 | 1687 | ||
PETG | 0.29 | 1200 | ||
Air | 0.025 | 1005 | ||