We’ve heard many stories of companies noticing changes in battery performance for a specific cell model. This often shows up as a bi-modal or multi-modal distribution in certain metrics – for example, distinct averages for different batches of a cell.

📊 Being able to track these changes in a product line is crucially important for designing battery packs, creating warranties, and even for certification if the performance changes have a material impact on key metrics such as energy and lifespan.

⚡ In one popular 21700 cell, we observed a change between models in 2022 and 2023. This was identified from differential capacity analysis, with a change in a silicon process matched to a specific NCA peak, with the change likely due to an increase in silicon or a formulation adjustment.

🔍 Other stories across the industry include:

• Optimisation to mechanical cell design

• Switching manufacturing lines

• Supply chain changes

📚 At About:Energy, it's important for us to document these differences when building models for different batches, ensuring companies receive accurate predictions for the cells they use.