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What is the Voltage of a Lithium Ion Cell?

Published in Battery Technology 1 min read

The voltage of a lithium-ion cell varies depending on its specific chemistry and size.

Voltage Range

  • Nominal Voltage: This is the average voltage of a lithium-ion cell, typically between 3.6V and 3.7V.
  • Full Charge Voltage: When fully charged, a lithium-ion cell can reach 4.2V.
  • Cut-Off Voltage: To prevent damage, the cell should not be discharged below 2.5V or 3.0V, depending on the type.

Factors Affecting Voltage

  • Chemistry: Different chemistries, like LiFePO4, LCO, or NMC, have different voltage ranges.
  • Size: Smaller cells generally have lower voltage than larger cells.
  • Temperature: Voltage can fluctuate with temperature changes.

Practical Insights

  • Battery Packs: Multiple lithium-ion cells can be connected in series to increase the overall voltage of a battery pack.
  • Voltage Monitoring: It's crucial to monitor the voltage of lithium-ion cells to ensure safe operation and prevent overcharging or over-discharging.

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