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Analysis of 18650 lithium battery parameters and operating temperature range. As a very important invention in history, the emergence of batteries has indeed solved many problems and greatly improved various life efficiency. The emergence of lithium batteries has further deepened people's understanding of electricity. The 18650 lithium battery is the oldest and still existing type of lithium battery, and its shadow can be seen in many fields. A friend asked the editor, what are the parameters of 18650 lithium batteries? Now, let me explain to you the parameters and operating temperature range of 18650 lithium batteries.

The advantages of 18650 lithium batteries

It is generally believed that lowering the no-load voltage of a lithium battery to below 3.0V is considered as running out of battery. Most lithium batteries should not be discharged with a no-load voltage below 3.2V, otherwise excessive discharge will damage the battery.

4.2V is the maximum limiting voltage for battery charging. It is generally believed that charging the no-load voltage of a lithium battery to 4.2V is considered fully charged. During the battery charging process, the voltage gradually rises from 3.7V to 4.2V. Lithium batteries cannot charge the no-load voltage above 4.2V, otherwise it will also damage the battery. This is the special feature of lithium batteries. Generally speaking, 18650 lithium batteries have the following advantages.

1. Widely applicable. Laptops, walkie talkies, portable DVDs, instruments, audio equipment, aircraft models, toys, cameras, digital cameras and other electronic devices.

2. Tandem. It can be combined in series or parallel to form an 18650 lithium battery pack. 3. The internal resistance of polymer cells with small internal resistance is smaller than that of general liquid cells. The internal resistance of domestic polymer cells can even reach below 35m Ω, greatly reducing the self consumption of batteries and extending the standby time of mobile phones, which can fully reach the level of international integration. This polymer lithium battery that supports high discharge currents is an ideal choice for remote control models, making it the most promising product to replace nickel hydrogen batteries.

4. There is no memory effect. There is no need to empty the remaining battery before charging, making it convenient to use.

5. High voltage. The voltage of 18650 lithium batteries is generally 3.6V, 3.8V, and 4.2V, which is much higher than the 1.2V voltage of nickel cadmium and nickel hydrogen batteries.

6. High safety performance. 18650 lithium batteries have high safety performance, do not explode or burn; Non toxic, pollution-free, certified by RoHS trademark; All kinds of safety performance are achieved in one go, with more than 500 cycles; Good high-temperature resistance, with a discharge efficiency of 100% at 65 degrees Celsius. To prevent battery short circuits, the positive and negative poles of 18650 lithium batteries are separated. So the possibility of a short circuit occurring has been reduced to the extreme. Protective plates can be installed to prevent overcharging and discharging of the battery, which can also extend its service life.

7. Long service life. The service life of 18650 lithium batteries is very long, with a cycle life of over 500 times during normal use, which is more than twice that of ordinary batteries.

8. Large capacity. The capacity of 18650 lithium batteries is generally between 1200mah and 3600mah, while the general battery capacity is only about 800. If 18650 lithium batteries are combined to form an 18650 lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah.

18650 Lithium Battery Parameters

The 18650 lithium battery is a typical battery named based on size, therefore, the size, which is one of the parameters of the 18650 lithium battery, is basically the same. Due to the fact that 18650 lithium batteries can be divided into four systems based on different positive electrodes: lithium cobalt oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate. Except for lithium iron phosphate, the other three materials can essentially replace each other. Therefore, the parameters of lithium cobalt oxide 18650 lithium batteries are compared with those of lithium iron phosphate 18650 lithium batteries.

18650 lithium cobalt oxide battery:

The nominal voltage is generally 3.7V

The charging limit voltage is generally 4.20V

The minimum discharge termination voltage is generally 2.75V

Diameter: 18 ± 0.2mm

Height: 65 ± 2.0mm

Capacity: Over 1000mAh (currently the highest is Panasonic's 2900mAh)

18650 lithium iron phosphate battery:

The nominal voltage for a single section is generally 3.2V

The charging limit voltage is generally 3.6V

The minimum discharge termination voltage is generally 2V

Diameter: 18 ± 0.2mm

Height: 65 ± 2.0mm

Capacity: smaller than 18650 of lithium cobalt oxide, commonly 1500mah

18650 lithium battery operating temperature range

Overcharge temperature range: 0 ℃ -+60 ℃, charging temperature: 0 ℃ -+45 ℃, working temperature: -20 ℃ -50 ℃, optimal working temperature is 20 ℃ -40 ℃, 60 ℃ is the temperature to ensure battery life, high temperature will shorten life, above 100 ℃ is dangerous, generally 140 ℃ will burn or explode.

With the continuous development of the lithium battery industry, lithium batteries are currently popular in the market with numerous advantages. Since 2010, over 100 billion yuan has been invested in the lithium battery market, promoting the rapid development and application of lithium batteries.

We can use it correctly in daily use and avoid battery short circuits, damage, or high temperatures, without worrying about the battery exploding. We cannot overturn a ship of people with one bamboo pole, and determine the safety of 18650 based on individual inferior products.

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