Cell-to-pack

Example

Use in Lemonergy

Make series/parallel architecture explicit.

This is a reference concept. No executable Lemonergy block has been verified for this term.

Connected concepts

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AB battery system

A pack that integrates two cell chemistries under one BMS — sodium-ion with lithium-ion, say, or LFP with NMC — so that one type covers the other’s weakness, such as poor cold-weather power or low energy density. CATL used the name at its 2021 sodium-ion launch; the BMS must model both voltage curves to estimate SOC.

Blade cell

A very long, thin prismatic LFP cell, close to a metre in length, laid side by side so the cells themselves stiffen the pack. The format trades cell-level energy density for pack-level packing efficiency and a large cooling surface.

Cell-to-chassis

Integrating the cells into the vehicle floor itself, so the battery enclosure is the chassis and the cells help carry its loads. It saves mass and height but binds the battery to the car for life.

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.

Module

A group of cells connected in series and parallel, mechanically held together with its own voltage and temperature sensing, built as the unit from which a pack is assembled and serviced. Cell-to-pack designs do away with it.

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.

1. 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.

2. 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.