How do I choose a lithium-ion battery pack?

When selecting a lithium-ion battery pack, understanding its voltage characteristics is crucial for ensuring optimal performance and longevity. Three key voltage terms define a battery's operation: Nominal Voltage, Charged Voltage, and Cut-Off Voltage.

What should you know about lithium ion batteries?

The most important key parameter you should know in lithium-ion batteries is the nominal voltage. The standard operating voltage of the lithium-ion battery system is called the nominal voltage. For lithium-ion batteries, the nominal voltage is approximately 3.7-volt per cell which is the average voltage during the discharge cycle.

What is a safe voltage for a lithium ion battery?

Lithium-ion batteries function within a certain range at which their voltage operates optimally and safely. The highest range where the fully charged voltage of a lithium-ion battery is approximately 4.2V per cell. The lowest range which is the minimum safe voltage for lithium-ion batteries is approximately 3.0V per cell.

How many volts is a lithium ion battery?

Here’s a simple breakdown of fully charged voltages by lithium-ion type: Devices rely on voltage to estimate battery level. Overcharging can trigger thermal runaway—a dangerous chemical reaction. Fully charging to 4.2V gives you max run-time, but stopping around 4.1V can extend battery life.

What is the SOC voltage chart for lithium batteries?

The SoC voltage chart for lithium batteries shows the voltage values with respect to SoC percentage. A Li-ion cell when fully charged at 100%SoC can have nearly 4.2V. As it starts to discharge itself, the voltage decreases, and the voltage remains to be 3.7V when the battery is at half charge, ie, 50%SoC.

How much SoC should a lithium-ion EV battery have?

Keeping your battery within the recommended SoC range of 20% to 80% ensures optimal performance and longevity. Here’s a table showing the approximate state of charge (SoC) versus voltage for a typical lithium-ion EV battery cell: