Battery knowledge · Modules, packs and battery management
CAN high and CAN low
The two wires of a CAN bus, a twisted pair driven in opposite directions. Idle, or recessive, both sit near 2.5 V; for a dominant bit CAN_H is pulled up to about 3.5 V and CAN_L down to about 1.5 V, so the receiver reads the 2 V difference. Noise picked up by the pair adds equally to both wires and cancels in the difference.
- Abbreviation
- CAN_H, CAN_L
- Unit
- V
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 CAN high and CAN low alongside CAN bus in this context. The serial network over which a BMS talks to the vehicle or inverter: a two-wire differential bus, defined in ISO 11898, carrying short prioritised messages at up to 1 Mbit/s, or faster with CAN FD. Every node hears every message, and a dominant bit wins arbitration without any collision.
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.