Fast charge has become the standard of today's smart phones, whether it is high-end machines, or some thousand yuan machines, most are equipped with fast charge function. Now the problem comes, fast charging can accelerate the charging efficiency of the mobile phone battery, but whether it has an impact on the battery? Since few mobile phone manufacturers mention this problem, the following Xiaobian will talk about this topic.
Q: Does the fast charging of mobile phones affect the battery?
A: The answer is yes, although fast charging can improve the charging efficiency of mobile phones, it also has an impact on battery life.
As for why, we will introduce in detail below, and attach the answer here first.
Q: Fast charge or slow charge?
A: If you look at it from the perspective of experience, it must be that the phone is quickly charged, and it charges faster. However, from the point of view of battery maintenance, slow charging is better for battery life.
At present, most of the companies that provide fast charge solutions have not given their impact on battery life from the battery point of view, but the battery capacity of more than 80% after 500 battery charging and discharging under the national standard is qualified, and the impact on use is not large within a year.
Therefore, if you are used to changing a mobile phone in one or two years, or are willing to replace a new battery, the impact of fast charging mobile phones is minimal for you, it is recommended that this part of the user is preferred to consider fast charging mobile phones, bringing a better experience.
But if you want to use the phone for 2-4 years without replacing the battery, you can consider a phone that does not support fast charging.
It can also make fast mobile phones reduce the number of fast charges, and only use them when they are urgently needed; Fast charge when the power is only about 30% rather than 3%, and when using fast charge, it is best not to run large memory games to avoid high temperature affecting battery life.
Charge the phone quickly, okay? The difference between fast charging and slow charging
Major mobile phone manufacturers are pushing fast charging mobile phones, but few manufacturers will talk about battery life when talking about fast charging.
Is the mobile phone fast charging good? What is the difference between fast charging and ordinary slow charging? This article will answer the principle of mobile phone fast charging technology from a professional perspective.
At present, the mainstream fast Charge technology for mobile phone applications is Qualcomm Quick Charge 2. 0(The latest is Quick Charge 3. 0), Mediatek Pump Express and OPPO VOOC flash charge three, of which Qualcomm and Mediatek are using high voltage charging, while VOOC flash charge uses high current charging.
On the mobile phone fast charge is not good, mainly from the experience and battery two aspects to consider. So, will fast charging affect battery life after all?
First of all, we must be clear about the charge and discharge principle of lithium-ion batteries, batteries have two poles: the positive electrode is a lithium compound, and the negative is extremely graphite.
Charging and discharging are the mutual conversion of electrical energy and chemical energy, and lithium ions are also becoming different compounds during the movement of positive and negative electrodes.
We can regard lithium ion as a car equipped with charge: when charging, due to the electric field, the car is driven to the negative electrode to store a certain amount of energy (lithium ion is embedded in the graphite carbon layer of the negative electrode); During the discharge, these charged lithium ion carts run to the positive electrode due to a chemical reaction (the removal of lithium ions, leaving the positive electrode in a lithium-rich state).
In this process an electric current is formed to supply power.
Lithium battery charging principle
Ideally, as long as the chemical structure of the positive and negative electrode materials does not change, the reversibility of the battery charge and discharge is very good, and the lithium-ion battery can ensure a long-term cycle.
Fast charging is mainly to ensure that lithium ions are quickly embedded from the positive electrode and quickly embedded in the negative electrode, and 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) will break to a certain extent, so that the electrode material and the electrolyte react with each other, and the temperature rise will also cause side reactions inside the battery to destroy the chemical substances on the battery, resulting in reduced reversibility (that is, the lithium ion car can not open back and forth).
It is what we often feel, when it is fully charged, why the battery is less and less able to withstand use.
Taking the lithium battery of DJI drone as an example, a 4480mAh 68Wh voltage is 15. A 2V lithium battery requires only 1. 5h(Compared to the iPhone6s plus battery capacity of 2750 mAh and voltage of 3.
8V) But the DJI drone's lithium battery life is only 200 cycles. The decline in battery life is noticeable.
According to the latest report from DIGITIMES, Apple is also working on upgrading battery charging technology recently, preparing to use 15V to 20V charging devices to improve battery efficiency and promote new IC technology. However, PWM IC equipment providers also say that this requires a significant risk.
Fast charge protection mode
The three fast charge schemes will have a temperature monitoring scheme for the battery. The increase in voltage is inevitably accompanied by an increase in temperature. If you play large games while using Qualcomm QC's fast charge technology, then due to chip control, the external voltage is limited to ensure that your phone will not be seriously heated, but the charging efficiency will decrease.
While the VOOC flash charge, the segment uses charge current control, and the multi-line setting of the charging cable and battery. In simple terms, a battery is charged before, and now it is divided into several batteries, and they are charged separately.
In terms of safety, because the fast charge has a \"handshake protocol\
Lithium battery charging is divided into three parts: constant current pre-charge (CCPre-charge), high current constant current Charge (CC Fast Charge) and constant voltage charge (CV).
After the phone runs out of power, the voltage decreases, and when it is lower than a certain value, the charger will use a relatively low current to pre-charge the lithium battery.
After a period of time, after the lithium battery voltage is higher than the predetermined value, it enters the second stage of high current constant current charging, and the appropriate increase in current can speed up the charging speed.
If you are using a non-fast charging phone, the fast charging head will not output high voltage to burn your phone. Just like when you use the iPad charging head to charge the iPhone, the iPhone will automatically recognize, input 1A current instead of the original 2A.
From the point of view of many protective measures, the charging voltage and current of the fast charge are in a safe state, as long as the original mobile phone charging adapter is used, it will not bring security risks.
Epilogue:
In general, mobile phone fast charging technology has advantages and disadvantages, depending on how you understand, in the short term, the impact of fast charging on battery life is not obvious, but in the long term, fast charging on battery life is also a greater impact.
However, in view of the current replacement cycle of the vast majority of users in 1-2 years, fast charging has little impact on battery life, so the experience of a better fast charging mobile phone is still the first choice.