Battery knowledge · Data, communication and electronics
Thermoelectric voltage error
A small voltage, the Seebeck effect, that appears wherever two different metals meet at different temperatures. Negligible for cell voltages, it matters for shunt current sensing: on a 100 µΩ shunt each microvolt reads as 10 mA, which coulomb counting integrates into SOC drift. Manganin is used for shunts partly because its thermal EMF against copper is under 1 µV/K.
- Also called
- Seebeck error, thermal EMF, thermocouple effect
Example
Data, communication and electronics: an example situation
2500 in a log might mean 25.00 °C, 2.5 V or raw counts. Units and scale must accompany the value.
Read Thermoelectric voltage error alongside Analog-to-digital converter in this context. The circuit that turns a voltage into a number. In a BMS its resolution, offset and drift set the floor for voltage and current accuracy: one millivolt of cell-voltage error is several percent of SOC on a flat LFP curve.
Use in Lemonergy
Separate quantities from encoding and transport.
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.
- 3rd generation of the CAN data link layer
CAN in Automation, CAN Newsletter · 2020
Topic background · Classical CAN, CAN FD and CAN XL data-link concepts; publication describes the 2020 state.
- 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.