from chemistry to pack
We would expect to see an improvement in Cell to Pack Ratio vs Cell Capacity. That means that as the cell get larger so the use of the pack volume becomes more efficient. As expected the transport battery data from the pack database shows this relationship. However, the upper pareto frontier for the data shows … Read more
The cell to pack volume ratio is the total volume of the cells divided by the volume of the battery pack. A significant issue with these numbers is the accuracy of the battery pack volume as it is based on overall dimensions and very few packs are rectangular. The following graph shows the spread of … Read more
Benchmarking battery pack volume is difficult as not many manufacturers give you a volume or even basic dimensions. This means we have to hunt for the data. Metrics In some cases manufacturers make a claim for the pack volumetric energy density. If you know the total energy the volume is easy to calculate: Scaling Sometimes … Read more
Pack Volumetric Energy Density is the total nominal energy of the battery pack divided by the volume it occupies. The battery pack volumetric energy density is a simple calculation: The easiest is to perhaps just look at the best and worst of the Wh/litre values: However, the battery pack volumetric energy density is not so … Read more