Parameters
As SOH does not correspond to a particular physical quality, there is no consensus in the industry on how SOH should be determined. The designer of a battery management system may use any of the following parameters (singly or in combination) to derive an arbitrary value for the SOH.
- Internal resistance / impedance / conductance
- Capacity
- Voltage
- Self-discharge
- Ability to accept a charge
- Number of charge–discharge cycles
In addition, the designer of the battery management system defines an arbitrary weight for each of the parameter's contribution to the SOH value. The definition of how SOH is evaluated can be a trade secret.
Read more about this topic: State Of Health, SOH Evaluation
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