EVS-09-08e
Proposed GTR-EVS preamble wording of underlying risk/rationale for requirements
for detection and quantification of the non-aqueous electrolyte release
This regulation distinguishes REESS in two categories based on the types of electrolytes:
Aqueous electrolyte (Definition 3.39) and Non-aqueous electrolyte (Definition 3.40). Risks
arising from release of aqueous and non-aqueous electrolytes are different. Whereas aqueous
electrolytes are corrosive and/or irritant many of the currently used non-aqueous Li-ion
battery electrolytes are toxic, irritant or harmful in addition to being flammable. While risks
arising from the flammability of the electrolytes and other REESS components are addressed
in the current GTR, risks associated with toxicity of released non-aqueous electrolytes,
although recognised in a number of standards (SAE J2289, SAE J2464 and UL 2580),
requires further research and will be addressed at a later stage in Phase 2.
It is very important to address these risks in electric vehicles where relevant amounts of
electrolyte, regardless of its physical state, may potentially be released. Since many of the
currently used non-aqueous solvents are (very) volatile, "visual inspection without
disassembling any part of the Tested-device" currently adopted as a verification means for the
detection of the aqueous electrolyte leak, may not always be adequate for full detection of the
non-aqueous electrolyte release. Further research will be performed to investigate alternative
methods for detection and quantification of the electrolyte released and to establish
appropriate requirements [in Phase 2].