Battery knowledge · Capacity, energy, power and ratings
Cell-to-pack ratio
The share of a pack’s mass or volume that is cells rather than housing, cooling, busbars and electronics. It is typically 60–75 % by mass; raising it is the point of cell-to-pack and cell-to-chassis designs.
- Also called
- gravimetric cell-to-pack ratio, GCTP
- Unit
- %
Example
Capacity, energy, power and ratings: an example situation
5 Ah at 3.6 V gives 18 Wh nominally. Integrated measured terminal power may give a different result.
Read Cell-to-pack ratio alongside Cell-to-pack in this context. Building the pack directly from cells without the intermediate module, using large-format cells that bear load themselves. It raises the cell-to-pack ratio and cuts parts, at the cost of making the pack harder to service.
Use in Lemonergy
Separate nameplate ratings from test results.
This is a reference concept. No executable Lemonergy block has been verified for this term.
References & further reading
Further reading on this topic
These sources provide broader context; they are not presented as citations for every statement in this entry.
- The International System of Units (SI), 9th edition
Bureau International des Poids et Mesures · 2026
Topic background · Definitions of SI units and coherent derived units; 2026 revision.
- Battery Test Manual For Electric Vehicles, Revision 3
Jon P. Christopherson · Idaho National Laboratory · 2015
Topic background · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.