We asked Google Gemini to analyse the Battery Pack Database 1.3.06 (released 27 April 2026) and this is the summary:
The analysis of the battery pack data reveals several key relationships and trends in battery technology, particularly within the electric vehicle (EV) and energy storage (BESS) sectors.
Key Takeaways
Technological Advancement Over Time: There has been a significant and steady increase in average gravimetric energy density over the last 15 years.
- In 2012, the average energy density was approximately 77.7 Wh/kg.
- By 2023, this increased to 145.0 Wh/kg, nearly doubling the energy storage capacity for a given weight.
- Projections for 2026 show continued high performance at around 144.2 Wh/kg, reflecting the maturation of high-nickel chemistries and improved pack design.
Chemistry Performance Trade-offs: The data confirms the performance hierarchy between different battery chemistries.
- NMC (Nickel Manganese Cobalt): Dominates high-energy applications like BEV Road Cars, typically offering higher energy density (often exceeding 150 Wh/kg at the pack level).
- LFP (Lithium Iron Phosphate): While generally lower in energy density (averaging around 90-120 Wh/kg), it is the most common chemistry in the dataset (569 entries), favored for its safety and cost-effectiveness in BESS and entry-level EVs.
- Efficiency in Pack Design (Cell-to-Pack): There is a clear relationship between the Cell-to-Pack (C2P) ratio and overall energy density.
- Higher C2P ratios (the percentage of the pack’s mass that is actually battery cells) lead to higher gravimetric energy density.
- Modern designs are pushing C2P ratios toward 60-70%, reducing the “dead weight” of enclosures and cooling systems to maximize vehicle range.
There is a clear relationship between the Cell-to-Pack (C2P) ratio and overall energy density.
- Higher C2P ratios (the percentage of the pack’s mass that is actually battery cells) lead to higher gravimetric energy density.
- Modern designs are pushing C2P ratios toward 60-70%, reducing the “dead weight” of enclosures and cooling systems to maximize vehicle range.
This post has been built based on the support of and sponsorship from: illumion, Custom Power, Quarto Technical Services, Eatron Technologies and About:Energy
- Application Diversity: The dataset is heavily weighted toward BEV Road Cars (674 entries) and Home/Grid Storage (BESS), highlighting the primary drivers of battery demand.
- Automotive packs show a tight linear correlation between mass and energy, whereas stationary storage (BESS Grid) prioritizes total capacity, with some systems reaching up to 40,000 kWh.
The Battery Pack Database is part of our download series that covers everything from cell to pack databases, battery calculations and a vehicle energy model.
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