does the open circuit voltage (ocv) of Rreachagable batteries affect the fully charged voltage value (up cut-off voltage)? ex. if we get 1.3v, should give this max. charge value or we can give more?
Farid Leguebedj
Open Circuit Voltage (OCV): This is the voltage of the battery when it is not supplying or receiving current (no load). It is determined by the battery’s chemistry and state of charge (SOC). It does not include voltage drops due to internal resistance. Fully Charged Voltage (Cut-off Voltage): This is the maximum safe charging voltage that the battery can reach before the charger stops. It is typically higher than the OCV at full charge, as charging requires a higher voltage to drive current into the battery. The exact value depends on the battery chemistry.
Yes, the open circuit voltage (OCV) of a rechargeable battery affects its fully charged voltage (cut-off voltage), but they are not necessarily the same.
Example Cases:
- Nickel-based (NiCd/NiMH) Batteries: OCV at full charge: ~1.3V per cell Charging cut-off voltage: Typically 1.4V to 1.45V per cell You should not use 1.3V as the charging cut-off, as this would undercharge the battery.
- Lithium-ion (Li-ion) Batteries: OCV at full charge: ~4.2V per cell Charging cut-off voltage: 4.2V per cell Charging beyond this can be dangerous.
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