When designing a battery pack you will always be asked to benchmark it. For this there are a number of key metrics:
- Safety
- Wh/kg – Pack Gravimetric Energy Density
- Wh/litre – Pack Volumetric Energy Density
- W/kg
- Ragone Plot – Power density vs Energy Density
- W/litre
- $/kWh
- Cell to Pack mass ratio
- Cell to Pack volume ratio
- Durability – % of pack capacity available after 10 years
A first look at pack metrics versus application and what is important and what is not.
5 = important
1 = not important
References
- “Battery requirements for future automotive applications”, EUCAR, EG BEV&FCEV, July 2019
Benchmarks
When looking at designing a battery pack it is a good idea to look at the other designs that are out there on the market.
Battery Pack Database
An excel file with hundreds of battery packs and thousands of datapoints. Check your design against other designs to ensure the metrics stand out from the crowd.