UL Solutions’ battery enclosure thermal runaway evaluation

UL Solutions’ battery enclosure thermal runaway evaluation

August 5, 2022

UL Solutions


UL Solutions, an applied safety science provider, announced the Battery Enclosure Thermal Runaway (BETR) evaluation, the first material screening test method at UL Solutions to evaluate electric vehicle (EV) battery enclosure material. The offering based on UL 2596, Test Method for Thermal and Mechanical Performance of Battery Enclosure Materials, was published on Jan. 27, 2022, by the UL Standards and Engagement organization.

Battery performance presents challenges in EV efficiency, the heavier weight of EVs caused by heavy battery systems means more frequent charging and shorter drive times. Battery enclosure systems play a critical role in mitigating the impact of thermal runaway, a risk associated with lithium-ion batteries. Thermal runaway occurs when the lithium-ion cell enters an uncontrollable self-heating state possibly producing fire, smoke and extremely high temperatures while ejecting harmful particulates.

The UL Solutions testing methodology evaluates material performance by simulating a thermal runaway scenario. The evaluations entail testing material plaques versus the entire battery assembly, reducing testing costs and development time for resin manufacturers and material suppliers. Evaluations also focus on screening multiple formulas during research and development to provide material producers the opportunity to offer original equipment manufacturers (OEMs) the solutions that meet their needs while also considering performance among materials.