Water immersion test

Example

Use in Lemonergy

Record specimen, state, instrument, temperature and timing.

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Connected concepts

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Enclosure

The sealed case that carries the modules, protects them in a crash, keeps water out to an IP67 rating or better and vents gas in a thermal event. In many cars it is a structural part of the body.

GB 38031

China’s mandatory national safety standard for electric-vehicle traction batteries. Its 2025 revision, mandatory from July 2026, requires that a single-cell thermal runaway produce no fire or explosion in the pack, going beyond the five-minute warning of earlier rules.

IP rating

A two-digit code for how well an enclosure keeps out solids and water: the first digit for dust, the second for water. Battery packs are typically IP67, dust-tight and able to survive brief immersion.

R100 Part II

The part of UN R100 that tests the battery system as a unit: vibration, thermal shock and cycling, mechanical shock and crash impact, fire resistance, external short circuit, overcharge and over-discharge protection, over-temperature protection and, from the 03 series, thermal propagation. Each test ends with a check that there is no fire, explosion, electrolyte leakage or loss of isolation.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. Battery Test Manual For Electric Vehicles, Revision 3

   Jon P. Christopherson · Idaho National Laboratory · 2015

   Topic background · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.