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Why is the nominal discharge voltage of a lithium battery 3.7V? 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 batteries

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

When a lithium battery is discharged, its working voltage always changes continuously over time. The curve drawn using the battery's working voltage as the vertical axis, discharge time, capacity, state of charge (SOC), or discharge depth (DOD) as the horizontal axis is called the discharge curve.

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

The market positioning and technological means of different lithium battery manufacturers vary, resulting in different discharge platforms and significant differences in quality.

Why is the nominal voltage of a lithium battery 3.7V?

We can understand it from a rechargeable perspective. The lithium battery is fully charged, and it will be approximately 4.2V or 4.3V. After discharging the lithium battery, it will be approximately 3.0V. The discharge diagram of a lithium battery is parabolic, with a rapid change from 4.3V to 3.7V and from 3.7V to 3.0V.

Only around 3.7V of discharge time 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 batteries is generally 3.6-4.2V, and stable operation is 3.6-3.7V.

The so-called nominal voltage is only the voltage set by the national testing standard, which is 3.7V. 3.7V is the national standard for lithium-ion batteries. 3.7V is only the voltage of a single individual lithium-ion battery, and the maximum voltage of a single battery can reach 4.25-4.3V. Of course, if you want to increase the voltage of a lithium-ion battery, there is also a way, you can connect the lithium-ion battery in series.

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

3.7V is the nominal voltage of a lithium battery, with a maximum voltage of 4.2V (the highest voltage during charging) and a termination voltage of 3V. A rated voltage of 3.7V is a property of lithium batteries, just like a dry battery is 1.5V.

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