How does fast charging affect lithium-ion batteries?
Theoretically, fast charging is the most damaging to lithium-ion batteries. Fast charging is detrimental to your phone's battery. In fact, whether it is fast charging or slow charging, it will damage the battery life. The main reason why fast charging will affect the battery life of mobile phones is that it increases the power. When charging, it will bring more heat than slow charging, and high temperature will accelerate battery aging.
A fast-charging lithium-ion battery refers to a battery that has been charged in a short time. Generally, the battery is fully charged within 6 minutes, and the battery is charged with a capacity of more than 95% of the rated capacity. Time is life, fast-charging batteries shorten the charging time, improve efficiency, and reach the international advanced level.
Requirements for fast-charging lithium-ion batteries
According to the structural characteristics of the fast-charging lithium-ion battery, the maximum charge termination voltage should be 4.2V, and it should not be overcharged, otherwise the battery will be scrapped due to the removal of too much lithium ions from the positive electrode.
Lithium-ion batteries have high requirements for charging and discharging, and can be charged by special constant current and constant voltage chargers. Usually, the constant current is charged to 4.2V/section and then switched to constant voltage charging. When the constant voltage charging current drops to less than 100mA, the charging should be stopped.
Charging current (mA) = 0.1 to 1.5 times the battery capacity (such as a 2000mAh battery, the charging current can be controlled between 200 and 4000mA). The conventional charging current can be selected at about 0.5 times the battery capacity, and the charging time is about 2 to 3 hours.
What is the impact of fast charging on lithium-ion batteries?
Whether the lithium-ion battery can be quickly charged depends on the experimental data of the lithium-ion battery manufacturer. Not all lithium-ion batteries can be quickly charged, otherwise the life of the lithium-ion battery will be greatly reduced, and there will be dangers such as fire and explosion. Therefore, each manufacturer will configure the slow charging port and the fast charging port according to the characteristics of the lithium-ion battery, and the BMS system will manage the charging process uniformly.
Lithium-ion batteries and lead batteries are a principle. The working principle of fast charging is: firstly increase the voltage, and secondly increase the current current. Just like that, fast charging also uses this principle, so a large amount of current in the storage plate will cause an overspeed reaction. This reaction generates a large amount of heat, which can damage or prematurely age the battery due to internal resistance and values exceeding the limit temperature.
