Will fast charging affect lithium ion battery life ?

Fast charging is important to ensure that lithium ion is quickly inserted from the positive electrode and quickly inserted into the negative electrode, which can not cause lithium ion deposition.

However, when the current increases, a layer of semi permeable film (SEI film) on the surface of the negative electrode (graphite) of the electrode will rupture to a certain extent, which will cause the electrode material and electrolyte to react with each other. In addition, the temperature rise will also cause side reactions inside the battery, which will destroy the chemical substances on the battery, resulting in the reduction of the reversibility (that is, the lithium-ion car can not be driven back and forth) and the battery capacity will continue to decrease 。

It's what we often feel. It's clear that the battery is fully charged, why the battery is becoming more and more unworkable.

Take the lithium-ion battery of DJI UAV as an example. A 4480 MAH 68wh lithium-ion battery with a voltage of 15.2V can only be fully charged for 1.5h (compared with the iPhone 6splus battery capacity of 2750mah and voltage of 3.8V), but the lithium-ion battery life of DJI UAV is only 200 cycles. The decline in battery life is obvious.

According to the latest report from DIGITIMES, apple is also working on upgrading battery charging technology, preparing to use 15V to 20V charging equipment to improve battery efficiency and promote new IC technology. However, pwmic's equipment suppliers also said that it would take a lot of risk.


Fast charging protection mode

The three fast charging methods will have the temperature monitoring method of the battery. In the increase of voltage at the same time can not prevent the rise of temperature. If you play a large game while using the fast charging technology of high pass QC, due to the chip control, the applied voltage is limited to ensure that your mobile phone will not be seriously hot, but the charging efficiency will be reduced.

The vooc flash charging adopts charging current control in sections, and multiple lines of charging cable and battery. To put it simply, one battery was charged before. Now it is divided into several batteries and charged separately.

In terms of security, because there is handshake protocol for fast charging, the output voltage and current will be coordinated before charging.

Lithium ion battery charging is divided into three parts: ccpre charge, ccfastcharge and CV.


When the mobile phone runs out of power, the voltage decreases. When it is lower than a certain value, the charger will use a relatively low current to pre charge the lithium-ion battery. After a period of time, when the voltage of lithium-ion battery is higher than the predetermined value, it will enter the second stage of high current constant current charging. At this time, properly increasing the current can accelerate the charging speed.


If you use a non fast charging mobile phone, the fast charging head will not output large voltage to burn your phone. Just like when you charge your iPhone with the iPad charging head, the iPad will automatically recognize and input 1A current instead of the original 2A.

Many protection measures, fast charging voltage and current is in a safe state, as long as the use of the original mobile phone charging adapter will not bring security risks.


Will fast charging affect battery life?

The answer is yes.


Even though some of the batteries equipped with fast charging mobile phones have some improvements in cell material and design, lithium ion can be quickly embedded and inserted into the battery, but the high voltage and current still cause battery loss.

But if you're used to changing your phone in a year or two, or if you're willing to replace a new battery, the impact will be minimal.

At present, most of the companies that supply fast charging methods have not given the impact on the battery life from the perspective of battery. However, under the national standard, the battery capacity of more than 80% after 500 times of charging and discharging is qualified, which has little impact on the use within one year.

If you want to use your phone for 2-4 years without changing the battery, the following suggestions may help you:

Reduce the number of fast charging, only use it when it is in urgent need; charge quickly when the power is only about 30% instead of 3%; when using fast charging, it is better not to run large memory games.