How to calculate the charging time of 18650 lithium battery?

According to the magnitude of impedance, a coefficient is designed as the comparison value of the charging time of the rechargeable battery. After long-term experiments, the method of obtaining this coefficient is simplified as the proportion of the charging current to the nominal capacity. Therefore, the charging time of the above-mentioned 18650 battery has evolved into: (1) 18650 lithium battery charging time u003d nominal capacity u0026 pide; charging current × coefficient (2) According to my country's standards, the rechargeable battery is not higher than 0.2C (C is the nominal capacity ) Charging is appropriate. According to this standard, the above coefficient is set to at least 1.2. Due to the high capacity of the 18650 lithium battery and the characteristics of the chargers of different lithium battery charger manufacturers, the coefficient setting in the calculation of the charging time of the 18650 battery is generally Set as 1.5, the charger is basically designed according to this principle. For example, the capacity of 18650 battery is generally 1800~2600mAh. According to the above formula, the choice of charger and the charging time of 18650 battery (discharge within 0.2C) are generally as follows: (3) Some chargers may have different designs, but generally There will be three coefficient choices: 1.2, 1.3, 1.5. The smaller the coefficient, the shorter the 18650 battery charging time. (4) 2600mAh generally uses a 500mA charger, about 7.8 hours (2600u0026pide;500×1.5) (5) 1800mAh generally uses a 350mA charger, about 7.5 hours (1800u0026pide;350×1.5), (6) 2000mAh generally It takes about 7.5 hours to charge with a 400mA (or 350mA) charger (if you use a 350mA charger, it takes 8.5 hours) (7) In practice, the charger itself is equipped with an overcharge protection device, and some battery manufacturers also In the design, the 18650 battery charging time is set through the protection board and the protection IC, as long as the consumer uses the battery and charger instructions. A slight supplement to the charging time of the 18650 battery is: stop charging in time after the charger indicator changes, because the overcharging caused by the 18650 battery charging time is too long to cause damage to the charger and the battery. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of the impact of low-temperature cycling on the performance of 18650 batteries