Safety case

Example

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.

Connected concepts

Related concepts from the knowledge graph. Connections show context, not cause and effect. Hover or focus a linked term for its definition.

Failure mode and effects analysis

A structured review that lists every way a component or process could fail, its effect, and how likely it is to happen and be detected, scoring each to prioritise fixes. Battery programmes run it on the cell, the pack design and the production process.

Functional safety

The discipline, standardised for vehicles in ISO 26262, of making sure electronic failures do not cause harm. Battery functions such as overvoltage protection are classified by risk into ASIL levels A to D, which set how redundant and verified their hardware and software must be.

Hazard analysis and risk assessment

The ISO 26262 step that lists the hazards a function could cause, rates each in its driving situation for severity (S0–S3), exposure (E0–E4) and controllability (C0–C3), and combines them into an ASIL or QM. Each hazard becomes a safety goal, such as ‘prevent cell overcharge leading to thermal runaway’, that the design must meet.

Hardware safety metrics

The ISO 26262 numbers showing that random hardware failures are under control. The single-point and latent fault metrics are the shares of failures that safety mechanisms cover — at least 99% and 90% for ASIL D — and PMHF is the residual rate of violating a safety goal, below 10⁻⁸ per hour (10 FIT) for ASIL D.

Functional and technical safety concepts

The two layers that turn safety goals into a design under ISO 26262. The functional safety concept states what must happen — detect a cell above its voltage limit and open the contactors within a set time — without naming parts; the technical safety concept allocates those requirements to hardware and software, such as a specific monitoring chip, diagnostic and contactor driver.

References & further reading

Technical references

1. ISO 26262-1:2018 — Road vehicles — Functional safety — Part 1: Vocabulary

   International Organization for Standardization · 2018

   Technical reference · Scope and terminology of automotive electrical/electronic functional safety. The catalogue is not the full standard.