ISO 12405-2 - Battery Design

Electrically Propelled Road Vehicles — Test Specification for Lithium-Ion Battery Packs and Systems — Part 2: High-Energy Applications

ISO 12405-2 specifies test procedures for lithium-ion battery packs and systems in high-energy EV applications — primarily battery electric vehicles (BEV) — where maximum driving range and energy capacity are the primary design objectives.

Published by: International Organization for Standardization (ISO)
Current edition: ISO 12405-2:2012
Part of series: ISO 12405-1 (high power), ISO 12405-3 (safety), ISO 12405-4 (performance)

Scope

ISO 12405-2 applies to lithium-ion packs and systems for BEV applications characterised by deep cycling, relatively low power-to-energy ratio, and the requirement for maximum usable energy over a full discharge cycle. It defines tests for capacity, energy throughput, charge/discharge efficiency, and accelerated cycle life.

Key Test Procedures

Capacity and Energy Testing

Reference capacity and usable energy are measured at multiple temperatures (−10 °C, 23 °C, 45 °C) at defined discharge rates. Capacity retention over temperature is characterised to establish the usable energy available for range estimation across climate conditions.

Cycle Life Testing

Cycle life is assessed using simplified EV driving profiles with deep discharge cycles. The test defines charge and discharge current profiles, rest periods, and temperature conditions. Capacity fade must be recorded periodically; end-of-life is typically defined at 80% of initial capacity (see State of Health).

Disclaimer: This is not a definitive guide, just an indication and it is important that you always go back to the source for legislation.

References

ISO 12405-2:2012, ISO