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Why is the nominal voltage of lithium-ion batteries 3.7V when discharging? The discharge platform of a good lithium-ion battery is 3.7V. The discharge termination voltage of a lithium-ion battery refers to the voltage at which the battery is discharged, and it is not advisable to continue discharging. Otherwise, it will cause irreversible loss of some of the battery's power, and in severe cases, it will completely damage the battery.

Discharge voltage of lithium-ion batteries

The regulation of over discharge protection voltage for lithium-ion batteries does not vary depending on the manufacturer, but is limited by the chemical characteristics of lithium-ion (polymer) batteries. Under normal temperature conditions, discharge voltages below 2.75V will cause irreparable damage to lithium-ion batteries.

When a lithium-ion battery is discharged, its working voltage always changes over time. The curve drawn by plotting the working voltage of the battery as the y-axis, the discharge time, capacity, state of charge (SOC), or depth of discharge (DOD) as the x-axis is called the discharge curve.

The discharge termination voltage of lithium-ion batteries is generally around 3.3, and the discharge protection voltage setting of the internal protection board of lithium-ion batteries is generally 2.5V. What is the appropriate setting for the discharge termination voltage of this lithium-ion battery? According to the termination voltage of 2.5V on the protection board, it will not affect the capacity performance of the lithium-ion battery and will not damage it.

The market positioning and technological methods of various lithium-ion battery manufacturers are different, and their controlled discharge platforms are also different, resulting in significant differences in quality.

Why is the nominal voltage of lithium-ion batteries 3.7V?

We can understand it from the perspective of rechargeable devices. When a lithium-ion battery is fully charged, it will be approximately 4.2V or 4.3V. After discharging the lithium-ion battery, it will be approximately 3.0V. The discharge chart of lithium-ion batteries is parabolic, with rapid changes from 4.3V to 3.7V and from 3.7V to 3.0V.

Only the discharge time around 3.7V is the longest, accounting for almost three-quarters of the time. That's why it's labeled as 3.7V. The working voltage of lithium-ion batteries is generally 3.6-4.2V, and stable operation is 3.6 or 3.7V.

The so-called nominal voltage refers to the voltage set by the national testing standard, which is 3.7V. 3.7V is the national standard for lithium-ion batteries, and it is only the voltage of a single lithium-ion battery. The maximum voltage for a single battery can reach 4.25-4.3V. Of course, if you want to increase the voltage of the lithium-ion battery, there is no way out. You can connect the lithium-ion batteries in series.

Generally speaking, under constant voltage conditions, stop charging when the voltage reaches 4.2V and the current is less than 0.01C, and then let it sit for 10 minutes. At any discharge current rate, the length of time that a lithium-ion battery takes to discharge to 3.7V is an important indicator for measuring the quality of the battery.

3.7V is the nominal voltage of lithium-ion batteries, with a maximum voltage of 4.2V (the highest voltage during charging), and a termination voltage of 3V is sufficient. A rated voltage of 3.7V is a property of lithium-ion batteries, similar to a dry battery being 1.5V.

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