Battery knowledge · Modules, packs and battery management
Cell packing arrangement
How round cells sit side by side. Square packing, in rows and columns, fills π/4 ≈ 78.5 % of the footprint and leaves straight channels for cooling; hexagonal or nested packing, each row shifted by half a cell, fills π/(2√3) ≈ 90.7 % and needs about 13 % less area for the same cells.
- Also called
- hexagonal packing, nested layout, staggered layout, square packing, cubic layout
Example
Modules, packs and battery management: an example situation
Twelve 3.6 V, 5 Ah cells in 6s2p give 21.6 V, 10 Ah and 216 Wh nominally before other restrictions.
Read Cell packing arrangement alongside Cell holder in this context. A moulded plastic frame with a socket for each cylindrical cell, which fixes the spacing, stops cells rubbing through their wrappers under vibration and leaves gaps for air or potting. A few millimetres between cells also slows thermal propagation; many automotive modules use the same idea at larger scale.
Use in Lemonergy
Make series/parallel architecture explicit.
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.
- Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs: Part 2. Modeling and identification
Gregory L. Plett · Journal of Power Sources · 2004
Topic background · Battery charge balance, open-circuit voltage, ohmic loss, polarization dynamics and model identification; parameters require cell-specific data.
- Getting Started with the BQ76925
Texas Instruments · 2019
Topic background · A concrete BMS analog front-end example: cell voltage, current, temperature measurement and MCU integration.