Lithium-ion battery work principle and charging requirements

　　Author ：Iflowpower – Portable Power Station Supplier

Most of the mobile phones use a lithium battery or a lithium polycore battery, which is a negative electrode material from a lithium metal or lithium alloy using a nonaqueous electrolyte solution. The earliest lithium battery comes from the great inventor love Di. Since the chemical properties of lithium metal are very lively, the processing, preservation, use, and environmental requirements of lithium metal are very high.

Therefore, the lithium battery has not been applied for a long time. With the development of microelectronics technology in the twentieth century, small-scale equipment is increasing, and the power supply has been highly required. Lithium batteries have entered a large-scale practical phase, especially for mobile phone battery applications, and the current commonly used mobile phone lithium-ion battery specification is: lithium ion secondary battery.

Currently used mobile phone lithium-ion battery nominal voltage is 3.7V (or 3.6V), charge off voltage 4.

2V (or 4.1V, different design according to battery cells). The charging requirements for lithium ion battery (GB / T182872000 specification) are first constant current charging, that is, the current is constant, and the battery voltage gradually increases with the charging process, when the battery terminal voltage reaches 4.

2V (4.1V), the constant current charge is Constant voltage charging, that is, the voltage is constant, the current according to the saturation of the battery, as the continuation of the charging process gradually decreases, when it is reduced to 0.01c, it is considered to be terminated.

Everyone pays attention, where C is a representation of the battery nominal capacity control current, such as the battery is 1000 mAh capacity, 1C is a charging current of 1000mA, pay attention to MA instead of mah, 0.01c is 10mA. Of course, the standard representation is 0.

01c5a. Then why think 0.01c is over the charging, in fact, this is the national standard GB / T18287-2000 stipulated.

In the past, it was generally 20mA, and the standard YD / T998-1999 of the Ministry of Posts and Electricity Department was also specified. The 0.01c specified in the national standard will help the charging is more full, and the manufacturer is favorable.

In addition, the national standard specified that the charging time was not more than 8 hours, that is, even if it has not reached 0.01c, 8 hours arrive, it also believes that charging ends. Because of the quality of the problem, it should reach 0.

01c within 8 hours, the battery is not good, and it is meaningless. So, remind everyone that there is no more than 8 hours when charging, so it is conducive to battery life.