Does the fast charge have any damage to the battery?

- May 11, 2019-

In principle, the damage of the battery basically comes from two aspects:


On the one hand, when the battery is charged and discharged, the cathode and anode of the battery will shrink and expand with the release and absorption of ions. The long-time fast charge will destroy the chemical substances on the battery, resulting in shortened battery life.

On the other hand, in the case of fast charging, due to the relatively high current, the thermal effect of the current will increase, causing the battery to generate high temperatures, and the high temperature will also cause a sudden drop in capacity and permanent damage to the battery core.

As we all know, one of the advantages of lithium batteries is that they can charge lithium-ion batteries at any time, rather than having to recharge them after using them. So, what is the charging cycle?


A charge cycle means that all of the battery's charge is from full to empty, and then from empty to full, which is not the same as charging. To put it simply, the 600 mAh lithium battery, you first charge from 0 mA to 400 mAh, use ah with N mAh; then you charge 150 mA, then use N mA Ann; finally recharged 100 mAh, when the last charge to 50 mAh, a charge cycle for this battery is here. (400+150+50=600)


A lithium battery used only half of the electricity on the first day and then fully charged it. If it is still the next day, it will be charged in half, and it will be charged twice in total. This can only be counted as one charging cycle, not two. Therefore, it is usually possible to complete a cycle after several charges. Each time a charge cycle is completed, the amount of power is reduced a little. This is why many people who use lithium battery mobile phones often say: "This broken mobile phone can be used for 4 days, but it can only be used for 3 days and a half." However, this power reduction is very small. After a high-quality battery has been charged for many cycles, it will still retain 80% of the original power. Many lithium-powered products will still be used after two or three years. Of course, the life of the lithium battery will eventually need to be replaced.


The life of lithium batteries is generally 300-500 charge cycles. Assuming that the amount of power supplied by a full discharge is 1Q, if the power consumption is reduced after each charging cycle, the lithium battery can provide or supplement 300Q-500Q power in its lifetime. From this we know that if you charge 1/2 each time, you can charge 600-1000 times; if you charge 1/3 each time, you can charge 900-1500 times. By analogy, if you charge randomly, the number of times is variable. In short, no matter how charged, the total power added to 300Q-500Q is constant. Therefore, we can also understand that the life of the lithium battery is related to the total charge of the battery, regardless of the number of times of charging. The effect of deep deep charge and shallow charge on lithium battery life is not much different.


In fact, shallow shallow charge is more beneficial for lithium battery. Only when the power module of the product is calibrated for lithium battery, it is necessary to deep charge. Therefore, products that use lithium-ion power supply do not have to be constrained by the process. Everything is convenient and can be charged at any time without worrying about affecting life.


Therefore, the lithium battery also has a long life problem under normal charging state, and each charging will cause a little damage to the battery, but the damage is minimal, and it takes up to one year or more to be displayed on the mobile phone. Therefore, whether it is fast charge or normal charge, it will cause irreversible damage to the battery, but the damage of fast charge will be slightly stronger than the normal charge state. However, under the various guarantees of the current fast charging technology, the battery damage is still in a safe and reasonable state.


At present, most of the companies that provide fast charging solutions do not give their impact on battery life from the perspective of batteries. However, after charging and discharging the battery for 500 times under national standards, the battery capacity is above 80%, which is within one year. It has little effect on the use.


If you are used to changing a mobile phone for a year or two, or if you are willing to replace a new battery, the impact of fast charging is minimal.



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