Battery knowledge · Testing methods
Swelling test
Measuring how a cell grows during cycling or storage in one of two fixtures: constant pressure, where springs or a pneumatic press hold a set force and the thickness change is logged, or constant volume, where rigid plates fix the gap and the rising force is logged. Module designers need both to size end plates and compression pads.
- Also called
- constant-pressure swelling test, constant-volume swelling test, swelling force test, thickness growth test
Example
Testing methods: an example situation
Resistance immediately after a current step can differ from a ten-second value because slower polarization contributes.
Read Swelling test alongside Compression pad in this context. A foam sheet between pouch or prismatic cells that keeps a defined pressure on them as they breathe on charge and swell with age. It also provides some thermal separation between neighbours.
Use in Lemonergy
Record specimen, state, instrument, temperature and timing.
This is a reference concept. No executable Lemonergy block has been verified for this term.
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.
- 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.