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

What is the capacity of the 18650 lithium battery? How to calculate the capacity of lithium battery? 18650 lithium battery is currently the most widely used type of lithium ion battery in industrial applications. The capacity of 18650 lithium battery is the main selling point of manufacturers. In addition, the brand of 18650 lithium battery cells with the same capacity is also a factor affecting the price. The capacity of 18650 lithium battery ranges from 1000mAh to 1000mAh. Between 3000mAh, but the more mature technology is generally between 1800mAh and 2600mAh. What is the capacity of the 18650 lithium battery? The maximum capacity of 18650 lithium battery is still a question worthy of discussion. Therefore, it has been concerned by many practitioners. In recent years, various lithium battery manufacturers in China have improved their technology and continue to experiment. Ru0026D, capacity has gradually increased. Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of the lithium ion battery is 3.7v, the charge cut-off voltage is 4.2v, the nominal voltage of the 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 type 2000mAh power type 18650 lithium battery is only 1000mAh5, the normal capacity type 18650 lithium battery has a maximum charging voltage of 4.2V, and the power type 18650 lithium battery has a maximum charging voltage of about 3.65V. The nominal voltage of a normal-capacity 18650 lithium battery is 3.7V, and the nominal voltage of a power 18650 lithium battery is 3.2V. In real life, the laboratory with the highest capacity of 18650 lithium batteries can achieve 3500mAh, but there is no mass market and no sale. At present, 2950mAh is sold in batches on the market. The battery with this capacity is called 3000mAh. Basically, the batteries with this capacity are imported. Voltage and capacity specifications of various 18650 lithium batteries: 18650 Ni-MH battery voltage is 1.2V, common capacity is 2500MAH, 18650 lithium ion battery voltage is 3.6V, and common capacity is 1500MAH-3100MAH. The larger the capacity of 18650 lithium battery, the longer the use time. It can provide users with longer-term power supply, but under the same system, the high capacity of 18650 lithium batteries will bring the negative effect of high prices, so the balance of capacity and price is very important. How to calculate the capacity of lithium battery? Lithium battery capacity (C) calculation method: capacity C u003d discharge battery (constant current) I × discharge time (hours) T in turn: discharge time T u003d capacity C / discharge current (constant current) I if the battery standard is known The nominal voltage (V) and nominal capacity (Ah) can be calculated to obtain the value of the rated energy. The formula is: Whu003dVxAh For example, a 12v20ah lithium battery, the rated energy is 12×20u003d240; in general, the nominal Both the voltage and the nominal capacity are marked on the battery. Summary: The capacity of the 18650 lithium battery is related to the model size, depending 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 the lithium battery capacity is very complicated, and the relationship with the volume is not linear. Many factors need to be considered, such as different materials, which have a great impact on the actual capacity. The larger the size, the larger the capacity/volume ratio.