Research methods  uses for 18650 lithium batteries

Parameters of 18650 Lithium Batteries

An 18650 lithium-ion battery has the following overall structure:

A single section generally has a nominal voltage of 3.6V or 3.7V.

Charge voltage: 4.20V (4.2V-4.3V for lithium cobalt)

The small discharge termination voltage is generally 2.75V V, 18650 manufacture below this voltage the battery capacity will be severely reduced or even destroyed.

Working voltage at the end of charging time: 4.20V

There is a diameter of 18 ± 0.2 mm

This product has a height of 65mm and a width of 2.0mm

18650 battery capacity: more than 1000 Mach, some brands will mark 3600 Mach or 4500 Mach and other amazing capacities. The current 18650 battery capacity of Sanyo will do 3100 Mach, but the price is high.

Method for repairing 18650 lithium batteries

The first method of lithium battery repair

Surface rust can be removed with an eraser or other cleaning tool.

Principle 1 of lithium battery repair;

As a result of long-term use of lithium-ion batteries, their metal surfaces will oxidize, resulting in poor contact between the battery and the phone. In order to improve battery and mobile phone contact, you can wipe the rusty surface of the materials with rubber or other cleaning tools, as lithium-ion batteries have a short use time.

The second method of repairing lithium batteries

In the case of unstable temperature control, the battery will greatly shorten the different times we use if you take out your battery after all use up, because it has no electricity and has been developed with a memory electricity part that has been developed with lithium-ion technology. Winter is coming, so leave it outside for a while, then bring it in. This method can make working memory electricity release.

Method II of lithium battery repair:

The cold temperature has an impact on the electrolyte of lithium batteries, causing a change in their chemical reaction. The charging and discharging process of these batteries involves the movement of negative and positive charges. Typically, at room temperature, the electrons have high kinetic energy, making the battery more active and prone to leakage. However, in low temperatures, the microstructure of the lithium film and electrolyte changes, resulting in reduced leakage current and temporary inactivity within the battery. As a result, after recharging, there will be longer wait times for phone usage.

The third method for repairing lithium batteries

Alternatively, you can remove the battery, put it in the freezer for about a week, and then slowly consume the electricity, which needs to be consumed by the machine first. After full charging, it is estimated that your current charging time is extremely short. When fully charged, disconnect and charge again, repeated several times, absolutely effective.

Three principles of lithium battery repair research:

Lithium batteries typically have a lifespan of around 600 charge cycles. However, frequent charging can lead to molecular thermal motion damaging the internal structure and decreasing the battery's efficiency in storing charges over time. While freezing the battery can temporarily improve its charging capacity, using this method frequently may not be sustainable in the long run. Once the microstructure of lithium-ion batteries is compromised, it cannot be fully restored, and continuous use of this technique may accelerate battery deterioration in mobile phones.

The third principle for repairing lithium batteries involves utilizing a deep discharge technique on mobile phones. This unconventional method aims to fully deplete the internal energy of the battery in order to achieve a more thorough recharge. To carry out this process, one can connect the phone to a small 1.5V light bulb, which will draw out all the remaining electricity until there is complete discharge. By slowly draining the battery using low voltage, the phone's battery can be recharged for longer periods of time. It's important to note that if the phone's connection falls below the rated voltage of 3.6 volts, it will automatically power off. Once this process is completed, the recharged phone battery should have an extended lifespan.

Usage of 18650 lithium batteries

A common 18650 battery can be divided into three groups: lithium-ion batteries, lithium ferrous phosphate batteries, and nickel metal hydride batteries. The number 18650 represents the external size of the battery: 18 refers to the battery diameter of 18.0mm, 650 refers to the height of 65.0mm. In terms of voltage and capacity, the nickel-metal hydride battery is 1.2V, with a capacity of 2500MAH, while the lithium-ion battery has a capacity of 1500MAH-3100MAH.

The 18650 battery has a theoretical lifespan of 1000 charges when used in the circulatory system. This high capacity option is commonly found in notebook batteries due to its value density. Its stable performance makes it a popular choice in various electronic technology fields in China, such as high-end flashlights, portable power supplies, wireless data transmission devices, and more. It is also frequently used in the production of portable instruments and equipment, including light control systems, printers, and industrial development tools, as well as medical instruments like electric warm clothes and shoes.

18650 batteries are commonly used in notebook batteries and high-end flashlights and are more commonly used in industry than in civil applications.