Battery knowledge · Modules, packs and battery management
State-of-charge indicator
The row of LEDs or small display on a battery pack that shows remaining charge, often lit by a push button to save energy. Four or five LEDs, each worth 20–25 %, are usual. It is only as accurate as the fuel gauge behind it; a voltage-only gauge reads badly on a flat curve such as LFP’s.
- Also called
- LED fuel gauge, battery level indicator, push-button gauge, SOCI
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 State-of-charge indicator alongside Fuel gauge in this context. The single chip in a phone, laptop or power tool that does the BMS’s state-estimation job for one or a few cells: coulomb counting corrected by an OCV model, with impedance tracking in better parts. It reports remaining capacity over SMBus or I²C.
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.