Battery knowledge · Aging and degradation
Storage state of charge
The state of charge at which a cell is kept when idle. Calendar aging rises with SOC because the negative electrode sits at a lower, more reactive potential, so cells are shipped and stored at 30–50 % rather than full. [1]
- Unit
- %
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
Separate mechanisms, observations and fitted models.
This is a reference concept. No executable Lemonergy block has been verified for this term.
References & further reading
Technical references
- Lithium ion battery degradation: what you need to know
Physical Chemistry Chemical Physics · 2021
Technical reference · Degradation mechanisms, modes, operational effects and their interactions.