Charging and Discharging Parameters of Samsung INR18650-30Q6 Lithium Ion Battery
Standard Charging
- Charging Voltage: 4.2V
- Charging Current: 0.5C (Maximum 15A)
- Constant Current Charging to 4.2V: The battery is charged at a constant current of 0.5C until the voltage reaches 4.2V.
- Constant Voltage Charging: Once the voltage reaches 4.2V, the charging method switches to constant voltage charging. The charging current gradually decreases as the battery charges.
- Charging Termination: Charging is terminated when the charging current falls below 0.02C (0.6A).
Fast Charging
- Charging Voltage: 4.2V
- Charging Current: 1C (Maximum 30A)
- Constant Current Charging to 4.2V: The battery is charged at a constant current of 1C until the voltage reaches 4.2V.
- Constant Current Charging to 0.5C: Once the voltage reaches 4.2V, the charging method switches to constant current charging at 0.5C (15A).
- Transition to Standard Charging: When the charging current falls below 0.5C, the charging mode switches back to standard charging.
Discharging
- Discharge Cut-Off Voltage: 2.5V
- Continuous Discharge Current: 30A
- Maximum Pulse Discharge Current: 60A
- Maximum Short-Circuit Current: 150A
Once the discharge cut-off voltage of 2.5V is reached, the battery is considered to be nearly depleted, with typically only 1%-2% of its capacity remaining.
Significance of Discharge Cut-Off Voltage
The discharge cut-off voltage for lithium batteries typically ranges from 2.5V to 3.0V, depending on the battery’s chemistry and model. When the battery voltage drops to the discharge cut-off voltage, it indicates that the internal chemical reactions have reached an irreversible stage. Continuing to discharge the battery beyond this point can cause damage.
Consequences of Discharging Below Cut-Off Voltage
Discharging a battery below its cut-off voltage can lead to several detrimental effects:
- Reduced Capacity: The battery’s usable capacity will rapidly decline, potentially leading to complete failure.
- Shortened Lifespan: The battery’s cycle life will be shortened, requiring more frequent replacements.
- Safety Hazards: The battery may exhibit safety hazards such as swelling, leakage, or even explosion.
Recommendations for Battery Preservation
To extend battery life and ensure safety, it is recommended to charge the battery when its charge level reaches 20%-30%, preventing it from completely discharging to the cut-off voltage.
Additional Tips for Extending 18650 Lithium Battery Life
- Avoid complete discharge or overcharging.
- Use an appropriate charger and charging mode.
- Do not expose the battery to extreme temperatures (high or low).
- Avoid impacting, piercing, or disassembling the battery.
- Regularly check the battery’s condition and replace it promptly if any abnormalities are detected.
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