UL 2580 - Battery Design

UL 2580 is the Standard for Safety for Batteries for Use in Electric Vehicles, published by Underwriters Laboratories (UL). It establishes safety requirements for complete battery packs, subassemblies, and modules used in electric and hybrid electric vehicles.

Published by: Underwriters Laboratories (UL)
Current edition: Edition 3 (March 2020, last revised June 2022); also published as ANSI/CAN/UL/ULC 2580-2022
Replaces: UL 2580 Editions 1 (2011) and 2 (2013)
Standard type: Safety standard / certification scheme (UL Mark)

Scope

UL 2580 applies to electrical energy storage assemblies for use in electric-powered vehicles, including complete battery packs, battery subassemblies and modules, combination battery pack and electrochemical capacitor assemblies, and battery assemblies for industrial trucks. It does not cover individual battery cells (see UL 1642), stationary energy storage (see UL 1973), or marine/aerospace applications.

Key Requirements and Test Methods

Electrical Safety Tests

Overcharge — verifies safe handling of charging voltage exceeding maximum rated voltage
External short circuit — assesses response to an unintended short between battery terminals
Forced discharge — tests the battery under conditions of continued discharge beyond minimum voltage
Voltage and temperature monitoring — verification that the BMS correctly monitors cell voltages and temperatures

Mechanical Safety Tests

Mechanical shock — simulates impacts during vehicle operation or collisions
Vibration — assesses durability under sustained vibration profiles representative of vehicle use
Crush — simulates structural deformation of the pack under compressive load
Nail penetration — induces internal short circuit to evaluate thermal propagation behaviour
Drop and rollover — simulates handling damage and vehicle rollover scenarios

Environmental Tests

Thermal cycling / thermal shock — repeated temperature excursions to assess structural and electrical integrity
High and low temperature operation and storage
Water immersion — verifies IP ingress protection rating
Salt spray corrosion — assessment of enclosure and connector corrosion resistance

Hazard and Abuse Tests

External fire exposure — assesses battery response to an external vehicle fire
Single-cell failure tolerance — verifies that failure of one cell does not propagate uncontrolled through the pack
Internal short circuit — simulates an internal fault within a cell to evaluate pack-level response

Certification and Regional Recognition

UL 2580 is the primary EV battery safety certification standard in the United States and Canada. It is published as a binational ANSI/CAN/UL/ULC standard, giving it formal recognition for the Canadian market. Compliance is typically required contractually by OEMs and fleet operators rather than under federal regulation, and is increasingly referenced in insurance and procurement requirements.

Related Standards

UL 1973 — batteries for stationary, vehicle auxiliary power, and light electric rail applications
UL 9540A — test method for evaluating thermal runaway fire propagation in BESS
UL 1642 — standard for lithium batteries at cell level
IEC 62619 — safety requirements for secondary lithium cells and batteries for industrial applications
UN 38.3 — transport testing requirements for lithium batteries
SAE J2929 — minimum safety criteria for EV/HEV propulsion battery systems, covering enclosure, thermal management and BMS

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