Battery knowledge · Testing methods
Self-discharge test
Charging a cell to a set state, storing it, and measuring either the OCV drop over days or the capacity lost over weeks. In production it is the K-value check; in the laboratory a potentiostatic hold measures the leakage current directly in hours.
Example
Charge retention during storage
After 6 months: 83.297% retained; after 12: 69.384%.
Constant fractional loss; chemistry and temperature effects are not modeled.
Explore the graph
A constant fractional loss produces an exponential decline.
After 6 months: 83.297% retained; after 12: 69.384%.
Q(t)/Q₀ = (1 − monthly loss)^t
Illustrative model. Constant fractional loss; chemistry and temperature effects are not modeled.
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.