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Voltage and parameters of 18650 lithium batteries, what is the capacity of 18650 lithium batteries? The voltage and capacity of 18650 lithium batteries are the most important performance parameters of this type of battery, and are also the fundamental factors determining the price of lithium batteries. Manufacturers can design 18650 lithium batteries with different capacities, which are determined by the raw materials and processes.

18650 Lithium Battery Parameter Table

The 18650 lithium battery is a typical battery named based on size, therefore, as one of the parameters of the 18650 lithium battery, the size 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.

The voltage of 18650 lithium batteries is one of the important parameters of 18650 lithium batteries. Mastering the basic knowledge of 18650 battery voltage plays an important role in scientific charging, discharging, and storage protection of 18650 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)

At present, the world's largest manufacturers of this type of lithium battery include Sanyo from Japan (which has been acquired by Panasonic), Panasonic, Samsung, and Sony.

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.

It can be seen that the sizes of the two are exactly the same, but the 18650 lithium batteries of these two systems have their own advantages and disadvantages. Specifically, the advantages of lithium iron phosphate batteries compared to lithium cobalt oxide batteries are:

1. Safer, no explosion or leakage caused by over flushing or over discharging

2. Longer lifespan, capable of cycling more than 1000 times during normal use

3. High magnification, 2C charging and 10C discharging, without overheating, explosion, leakage, and affecting lifespan. However, the single cell voltage of lithium iron phosphate 18650 battery is low, and it is mostly used in electrical appliances with high current operation.

The voltage parameters of a single 18650 lithium battery are as follows

1、 The core voltage of 18650 lithium batteries is the working voltage, also known as the nominal voltage, which is 3.7V, which is equivalent to three series connected nickel cadmium or nickel hydrogen batteries. Some domestic battery manufacturers also design a working voltage of 3.6V.

2、 Charging limit voltage: This is the maximum limit for the voltage of an 18650 battery, which is 4.2V. The charging process of an 18650 lithium battery is the process of increasing the voltage from 3.7V during operation to 4.2V. When the process is completed, it indicates that the battery is in a fully charged state. Exceeding 4.2V indicates overcharging, which can cause damage to the battery.

3、 Discharge termination voltage: The voltage of the 18650 lithium battery drops to the lowest working voltage that is not suitable for further discharge, which is 2.75V. If the battery is placed below the termination voltage, it is over discharged. Over discharge will damage the electrode structure of the 18650 battery, cause irreversible reactions of lithium ions, and seriously affect the lifespan of the 18650 battery.

What is the capacity of 18650 lithium batteries?

The capacity of 18650 lithium batteries is of personal concern to many industrial users and consumers. This is because the larger the capacity of 18650 lithium batteries, the longer their usage time can provide users with longer power supply. However, in the same system, a high capacity of 18650 lithium batteries will bring negative effects on high prices. Therefore, a balance between capacity and price is very important.

The capacity of 18650 lithium batteries is distributed between 1000mAh and 3000mAh, but the most mature technology is generally between 1800mAh and 2600mAh. This is because the low capacity of 18650 lithium batteries can affect the effective working time of the batteries and have applicability issues. If the capacity of 18650 lithium batteries is too high, the cost will increase significantly, and the significance of 18650 lithium batteries with excessive capacity in non special fields is not very significant.

The capacity of 18650 lithium batteries is the main selling point of manufacturers. In addition, the brand of 18650 lithium battery cells with the same capacity is also a factor that affects the price. Generally speaking, imported brands have higher prices than domestic brands of the same type. As mentioned earlier, the main factor determining the capacity of 18650 lithium batteries is also the structure of raw materials. Therefore, from the perspective of the positive electrode, the price of using lithium cobalt oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate may vary.

The 18650 lithium battery pack needs to be customized according to different products used in different working environments and fields. When selecting the 18650 lithium battery pack, consideration should be given to the consistency, stability, and safety of the battery cells. In addition, each battery in each group should have the correct values in all aspects, such as the same voltage, internal resistance, and capacity.

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