Charging method for lithium ion battery

Charging method for lithium ion battery

GB/T18287 2000 charging requirements for lithium ion batteries:

1, lithium ion battery nominal voltage 3.7V (3.6V), charging cut-off voltage 4.2V (4.1V, according to the core of the brand has different designs).

2, charging mode: first constant current charging, that is, the charging current is certain, and the battery voltage increases gradually with the charging process, when the battery terminal voltage reaches 4.2V (4.1V), the constant current charging is constant voltage charge, that is, the voltage is constant, the current is based on the saturation degree of the core, and when the charging process continues to decrease, when it is reduced to 0.01C It is considered that the charge is terminated. (C is a representation of the battery nominal capacity compared to the current, such as the battery is the capacity of the 1000mAh, 1C is the charging current 1000mA, the attention is mA rather than mAh, 0.01C is 10mA. Of course, the standard expression is 0.01C5A, which I simplified here.

3, why do we think that 0.01C is the end of charging: This is stipulated by the national standard GB/T18287-2000 and is also discussed. In the past, 20mA was used to end. The industry standard YD/T998-1999 of the Ministry of Posts and Telecommunications also stipulates that no matter how large the battery capacity is, the stopping current is 20mA. The 0.01C provided by the GB helps to recharge the battery more fully and is beneficial to the manufacturer side through identification. In addition, the GB stipulates that the charging time does not exceed 8 hours, that is to say, even if it has not reached 0.01C, 8 hours have arrived, it is also thought that the charge is over. (no matter the quality of the battery, it should reach 0.01C in 8 hours, and the poor quality battery will be meaningless).

4, What is the right charge current? the smaller the theory, the better for the battery. But you can't charge a battery for 3 days. The low rate charge stipulated by the national standard is 0.2C (Arbitration charging mode). For example, the battery of the 1000mAh capacity above is 200mA, so we can estimate the battery for more than 5 hours to fill.

The wrong statement about lithium battery charging: because the number of charge and discharge is limited, the power of mobile phone batteries should be used up and recharged as much as possible.

In normal circumstances, you should recharge the battery recharge principle with the remaining battery charge (but it is absolutely not a shutdown and recharge). If your battery is not expected to stick to the whole day for second days, you should start charging in time! And when you need to recharge an important event that is expected to lead to a busy communication, even when there is a lot of electricity on the battery, you can only charge it ahead of time, because you don't really lose a charging cycle life! The principle of battery remainder recharge is not to go to the extreme.