Sustainability Language

Energy & Transition

Battery management system (BMS)

The electronic control system that monitors and protects rechargeable battery packs — managing voltage, current, temperature and cell balance to keep batteries safe, efficient and long-lived.

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Definition

An electronic system built into or added to rechargeable battery packs that performs three core functions: monitoring (voltage, current, temperature, state of charge and state of health), protection (against overcharge, over-discharge, short circuits and temperature extremes that could trigger thermal runaway), and optimisation (cell balancing and charge control to maximise capacity and lifespan).

References

Overview

What it means

Lithium-ion batteries carry a flammable electrolyte and are damaged by operation outside narrow limits; the BMS is the safety and durability layer that makes them usable in vehicles and grid storage. It calculates how much current can safely flow, balances cells (actively or passively), and shuts the battery down when thresholds are crossed — which is why lithium systems cut off rather than fade.

How it is used

Every EV and stationary battery system incorporates a BMS; its data (state of health, cycle history) increasingly feeds battery passports, second-life assessment and warranty management — linking it to circular-economy and traceability requirements such as the EU Battery Regulation.

Why it matters

Battery safety, lifespan and residual-value assessment all depend on the BMS: better management extends first life, enables second life and reduces fire risk — material factors in the sustainability of electrification at scale.

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