10-18-2023, 02:12 AM
speaking from some industry knowledge - usually the state of health is defined as how much capacity the battery has now as opposed to what it has at beginning of life. Sometimes there can be some estimation of the internal resistance of the cells as well to factor in.
The normal way to judge how much capacity the battery has now is by monitoring how much the state of charge changes relative to how much charge is put into or removed from the battery (e.g., in more technical terms, correlating the SOC estimation from OCV measurements to SOC estimation from coulomb counting). Probably easiest to do this during a charge cycle since you can reliably track how many kwh you put back into the battery vs what you'd expect at beginning of life.
The normal way to judge how much capacity the battery has now is by monitoring how much the state of charge changes relative to how much charge is put into or removed from the battery (e.g., in more technical terms, correlating the SOC estimation from OCV measurements to SOC estimation from coulomb counting). Probably easiest to do this during a charge cycle since you can reliably track how many kwh you put back into the battery vs what you'd expect at beginning of life.