Battery knowledge · High-voltage and functional safety
Battery disconnect unit
The box inside the pack that holds the contactors, pre-charge circuit, main fuse or pyrofuse and current sensor, where the pack’s high-voltage connections are made and broken.
- Abbreviation
- BDU
- Also called
- battery junction box
Example
High-voltage and functional safety: an example situation
Normal-operation current limits do not demonstrate correct contactor behavior under a welded-contact or sensor fault.
Read Battery disconnect unit alongside Contactor in this context. A heavy-duty electrically operated switch that connects the pack to the vehicle or inverter and opens it on fault or shutdown. Packs use at least two, one per pole, plus a pre-charge path to avoid welding them on the first connection.
Use in Lemonergy
Relate protection to faults, detection and response.
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.
- ISO 26262-1:2018 — Road vehicles — Functional safety — Part 1: Vocabulary
International Organization for Standardization · 2018
Topic background · Scope and terminology of automotive electrical/electronic functional safety. The catalogue is not the full standard.