18650 Lithium Battery Discharge Guide: Reasonable Use, Avoid Over-discharge

18650 lithium battery discharge guide: reasonable use, avoid over-discharge

18650 lithium battery has become the preferred power source for many electronic devices due to its high energy density, long cycle life and stable discharge performance. However, improper discharge method will seriously affect the performance and life of the battery, and even cause safety hazards. This article will analyze the discharge characteristics of 18650 lithium battery in detail for you, and provide practical guidelines for reasonable use and avoid over-discharge.

1. Analysis of 18650 lithium battery discharge characteristics

To use 18650 lithium battery reasonably, you first need to understand its discharge characteristics:

Discharge curve: The discharge curve of 18650 lithium battery is not linear, and its voltage will gradually decrease as the discharge process proceeds. Under normal circumstances, the voltage drops faster in the early stage of discharge, is relatively stable in the middle stage, and then accelerates in the later stage.

Discharge cut-off voltage: The discharge cut-off voltage refers to the minimum safe voltage at which the battery is discharged. Continuing to discharge below this voltage will cause the battery to be over-discharged and damage the battery performance. Generally speaking, the discharge cut-off voltage of 18650 lithium battery is 2.5V-3.0V. The specific value needs to refer to the battery specification.

Discharge current: The discharge current refers to the current output when the battery is discharged. Excessive discharge current will cause internal heating of the battery, accelerate battery aging, and even cause safety problems. Therefore, it is necessary to select a suitable battery according to the power consumption of the equipment and avoid long-term high-current discharge.

2. Hazards of over-discharge: performance degradation, safety hazards

Over-discharge refers to the state where the battery is discharged to a voltage lower than the cut-off voltage, which will cause the following hazards to the battery:

Capacity decay: Over-discharge will cause irreversible damage to the internal material structure of the battery, thereby reducing the capacity of the battery and shortening its service life.

Increased internal resistance: Over-discharge will intensify the chemical reaction inside the battery, resulting in an increase in the internal resistance of the battery, affecting its discharge performance.

Safety hazards: Severe over-discharge may cause internal short circuits in the battery, causing safety accidents such as heating, leakage, and even fire and explosion.

3. Reasonable use to avoid over-discharge: Practical guide

In order to avoid over-discharge and extend the service life of 18650 lithium batteries, it is recommended to follow the following guidelines:

Use batteries with protection boards: The protection board can monitor the battery voltage and automatically cut off the circuit when the voltage is lower than the cut-off voltage to prevent the battery from over-discharge.

Avoid deep discharge: Try not to charge the battery when it is exhausted. It is recommended to charge when the remaining power is 20%-30%.

Choose the appropriate discharge current: Choose the appropriate battery according to the power consumption of the device, and avoid long-term high-current discharge.

Pay attention to the battery temperature: During the discharge process, if the battery temperature rises abnormally, stop using it immediately and check the cause.

Check the battery status regularly: Check the battery voltage, capacity, internal resistance and other parameters regularly to detect and deal with abnormal conditions in time.

4. Charging and storage: Extending battery life

In addition to reasonable discharge, the correct charging and storage methods can also effectively extend the service life of 18650 lithium batteries:

Use original or brand chargers: Poor quality chargers may pose safety hazards. It is recommended to use original or brand chargers to charge the battery.

Avoid overcharging: After charging is completed, the charger should be unplugged in time to avoid overcharging the battery.

Suitable temperature environment: When charging and storing the battery, a cool and dry environment should be selected to avoid high temperature and humidity.

Long-term storage: If the battery needs to be stored for a long time, it is recommended to keep the power at around 40%-60% and check the battery status regularly.

V. Conclusion

The reasonable use and maintenance of 18650 lithium batteries are essential to ensure the normal operation of the equipment and extend the battery life. I hope that the discharge guide and practical suggestions provided in this article can help you better use 18650 lithium batteries, avoid the harm caused by over-discharge, and give full play to their performance advantages.