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What is the capacity of 18650 lithium battery? How to calculate the capacity of lithium battery?

Time:2020-04-30|

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What is the capacity of lithium battery in 18650? How to calculate the capacity of lithium battery? 18650 lithium battery is the most widely used type of lithium-ion battery in the industry at present. The capacity of 18650 lithium battery is the main selling point of the manufacturer. In addition, the brand of 18650 lithium battery cell with the same capacity also affects the price. The capacity of 18650 lithium battery is distributed between 1000mah and 3000mAh, but the mature technology is generally between 1800mAh and 2600mAH.


What is the capacity of 18650 lithium battery?
How much MAH the capacity of 18650 lithium battery can achieve is still a problem worthy of discussion. Therefore, it has been concerned by many practitioners. In recent years, the technology of various lithium battery manufacturers in China has been improved. With continuous experimental research and development, the capacity has been gradually improved.
The common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion battery is 3.7V, the charging cut-off voltage is 4.2V, the nominal voltage of lithium iron phosphate battery is 3.2V, the discharge cut-off voltage is 3.6V, the capacity is usually 1200mah-3350mah, and the common capacity is 2200mah-2600mah.
If the capacity of 2000mAh power 18650 lithium battery is only 1000mah5, the maximum charging voltage of common capacity 18650 lithium battery is 4.2V, and the maximum charging voltage of power 18650 lithium battery is about 3.65v. The nominal voltage of normal capacity 18650 lithium battery is 3.7V, and that of power 18650 lithium battery is 3.2V.
In real life, the lab with the highest capacity of 18650 lithium battery can achieve 3500mah, but there is no mass market and no sale. At present, there are 2950 MAH batteries on the market in bulk. The batteries with this capacity are called 3000 MAH by people. Basically, the batteries with this capacity are imported.
Voltage and capacity specifications of various 18650 lithium batteries:
18650 NiMH battery voltage is 1.2V, common capacity is 2500mah
18650 lithium ion battery has a voltage of 3.6V and a common capacity of 1500mah-3100mah
The larger the capacity of 18650 lithium battery is, the longer the use time is, and the longer the power supply can be provided for users. However, in the same system, the high capacity of 18650 lithium battery will bring the negative effect of high price. Therefore, the balance between capacity and price is very important.
How to calculate the capacity of lithium battery?
Calculation method of capacity (c) of lithium battery: capacity C = discharge battery (constant current) I × discharge time (hour) t
Conversely: discharge time t = capacity C / discharge current (constant current) I
If the nominal voltage (V) and the nominal capacity (ah) of the battery are known, the value of the rated energy can be calculated by the formula: wh = vxah for example, a 12v20ah lithium battery, the rated energy is 12 × 20 = 240; generally speaking, the nominal voltage and the nominal capacity will be marked on the battery.
Summary: the capacity of 18650 lithium battery is related to the model size, which depends on the thickness, width and length of the battery. It is also related to the material and size of the battery. The actual calculation formula of lithium battery capacity is very complex, which is not linear with the volume. Many factors need to be considered, such as different materials, which have a great impact on the actual capacity. The larger the size is, the larger the capacity / volume ratio is.

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