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1. Using the phone while charging will significantly increase the current density of the lithium-ion battery compared to the phone battery used in a non charging state. The increase in circuit density will lead to an increase in the internal voltage drop of lithium batteries, and more electrochemical energy will be converted into Coulombic heat. The generation of thermal energy further increases the internal resistance of lithium batteries, which in turn continues to increase the internal resistance of lithium batteries and the resulting Coulombic heat,..., Forming a vicious cycle. In the end, as the overvoltage increases, the safety voltage sensor on the back of the phone detects that the charging and discharging voltage of the lithium battery is no longer the true charging and discharging voltage. The result is that the voltage will exceed the specified safety voltage potential window or cut-off voltage, causing damage to the chemical structure and composition of the lithium battery electrode material, collapse of the material structure, and performance degradation. If severe, it can lead to battery bulging or even explosion.

2. Continuing from the "heating up" section in the above content: Using the phone while charging can cause the temperature to rise, forcing the electrochemical environment of the lithium battery electrodes to change. Under normal conditions, the electrochemical environment of lithium batteries is in a metastable state. The stable solid electrolyte film (SEI film) formed by long-term electrode passivation on the anode surface of the negative electrode material under metastable state will decompose and dissolve into the electrolyte under sudden non-stationary conditions. But the composition of SEI is complex, and it is actually difficult to be physically dissolved by the electrolyte in a true sense. Although SEI films are good conductors of lithium ions, their lithium ion conductivity mechanism is not equivalent to solid-state lithium ion electrolytes, and their performance cannot be compared (see relevant papers on JES for details). So, the result is that the electrolyte is contaminated, the ionic conductivity of lithium ions decreases, the internal polarization of the battery increases, the utilization efficiency of the battery material decreases, and both the cycling performance and rate capability of the battery decrease.

3. Continuing from the second point above, SEI film decomposition: The decomposed SEI film exposes the surface of the electrode material to the electrolyte environment. SEI film is not a good type, it won't be very honest! So, during the subsequent charging and discharging process, the SEI film will re form on the surface of the electrode material, becoming thicker and thicker. This newly formed SEI film is not a secondary deposition of the previously decomposed SEI, but a re formed result of the electrochemical decomposition and precipitation of the electrolyte components. This process seriously damages the electrolyte, resulting in a decrease in electrolyte performance and a decrease in battery performance.

4. Continuing the above three points: If the overpotential is too high, continue to charge and discharge. Originally, the cut-off of lithium batteries would protect and maintain the battery, but due to the excessive overpotential caused by the damage and reshaping of SEI, the electrochemical charging and discharging depth (depth) of the electrode material increases, the stability and morphology of the electrode material structure are completely destroyed, the microstructure collapses, and the internal resistance (ion resistance and electronic resistance) increases. Therefore, the performance of lithium batteries decreases, and the battery level is not as good as before.

I don't know if anyone has had a similar experience, charging and discharging at the same time. After using the phone a few times, I felt that the battery level of the phone was not as good as before. That's it! My own phone is a 2-year contact iPhone 5 contract phone from AT&T, which is cheap and often used in a useless manner without maintenance. Nowadays, it is common for the iPhone to automatically shut down when the battery level of the phone shows 8% -11%. This is caused by the destruction, regeneration, re destruction, re generation, back and forth cycling of the SEI membrane, and even excessive overpotential.

It is best to keep the battery fully charged at all times, and not wait until it runs out of battery to charge again. When it runs out of battery, the chemicals in the lithium battery will decrease, affecting its lifespan. Playing while charging can have an impact on the battery. Poor quality batteries may also explode. As for backend applications, the Android system actually stops running when it returns to the main page, so there is no need to worry about power consumption issues with backend applications. In addition, it doesn't really matter whether the lithium battery is turned on or off for charging.

1. Try not to play games while charging

Nowadays, many mobile games are very challenging and require a lot of time to play, making it even more challenging than PC games. The battery of a mobile phone is limited, and it often runs out of battery while playing. So netizens like to play games while charging and stay online in real-time. Little did they know that smartphones, due to their limited body size, have tightly integrated batteries and motherboard chips. When running games on a mobile phone, the processor will maintain high computational load while the screen will remain on. In this way, it is easy for a large amount of heat to accumulate inside the body, which cannot be discharged immediately and can easily be transmitted to the battery. The lithium batteries used in smartphones are most resistant to high temperatures. Charging at high temperatures for a long time has a significant impact on the battery's lifespan.

Many mobile phones are prone to overheating while playing games. If you plug in the power again at this time, the heat generated during charging will accumulate, making people feel hot when touched, and the damage to the battery can be imagined. If it is necessary to charge while playing games, it is best to place the phone on a surface that is easy to dissipate heat, such as glass or metal, to allow the body's heat to be discharged and protect the battery.

Players who often need to charge while playing games can choose some phones that support low-voltage fast charging. Nowadays, OPPO's VOOC flash charging, OnePlus's DASH flash charging, and Huawei's SuperCharge all belong to low-voltage fast charging. Low voltage fast charging reduces the pressure drop process inside the phone, so the heat generated is smaller than that of high voltage fast charging. Moreover, charging while playing games does not affect the fast charging effect.

2. Do not use the USB port on your computer to charge your phone

Many players, for the sake of convenience, use the USB port on their PC to charge their phones, which was not a problem in the era of feature phones in the past. However, the power consumption of smartphones has increased, and the USB port current of PC computers is generally only 500mA. Charging the phone during standby is very difficult. If the phone is used while charging through the USB port of the PC, there is a high possibility of insufficient power supply. When one side of the battery is being charged, the other side also needs to provide power for the operation of the phone, which becomes charging and discharging at the same time. Sometimes when we play games while charging our phones, we find that the battery is actually decreasing, which is a situation like this.

So if you want to charge your phone at the same time, it's best to use the standard charger. Do not use the USB port of your PC to charge, nor do you use a miscellaneous charger with unknown origin. If it is found that the battery level of the phone does not increase but decreases during charging, you should immediately stop using the phone or replace it with a higher power charger.

Because smartphones consume a lot of electricity quickly, many people will play while charging their phones. But many people will say that playing with a phone while charging can damage the battery and reduce its lifespan.

1. From daily usage experience, it can be seen that firstly, laptops can also be charged while in use. When performing large calculations, the current will suddenly increase, so why is the laptop okay? Secondly, when the phone is connected to the computer through a data cable, it will also charge and operate the phone's memory. Isn't it charging while using it? Thirdly, when charging, the phone is not turned off and the program is still running. Even if we don't do anything, isn't the operating system working?

2. From the analysis of circuit principles: The charging circuit converts 220 volts AC into 5 volts DC (or directly outputs from the USB port), then connects to the battery protection circuit, and finally connects to the battery. The protection circuit can ensure that the battery will not charge after being fully charged and will not discharge after being over discharged. Simply put, let's talk about the charging principle. A battery can be seen as a container. When charging, electricity flows towards the battery. At this point, the electricity needed by the phone is provided by the charger (imagine that battery charging and discharging are channels, how can there be electricity output when charging into the battery?). So, the so-called "charging while using" actually means that the charger supplies power to both the battery and the phone. When the battery is fully charged, the protective circuit works, the circuit is cut off, and the battery no longer charges, but also does not discharge. As long as the charging line is still connected, the phone will not be powered by the battery, but by the charger.

3. From the perspective of usage, mobile phones, especially smartphones, have many uses. Traditional functions include making calls and sending text messages, while new functions include browsing the internet and playing games. The screen still consumes the most power. From the above analysis, we know that when charging, the phone is powered by a charger. However, there is an exception, which is that when the phone needs a very large current (it is unknown whether this situation exists), the charger cannot provide it, and the battery will discharge. Even so, the battery output energy is not as large as usual because there is also a charger to help it supply power.

In short, there is only one channel for battery charging and discharging, either charging or discharging, and there is no problem of charging and discharging at the same time. The conclusion is that there is nothing wrong with using a mobile phone while charging. If you are not afraid of trouble, dragging the charger all the time can also reduce the number of battery discharges and extend the battery life. However, doing so also carries risks because none of us can guarantee that the characteristics of the battery's charging and discharging protection circuit will never change and the quality will be foolproof. Therefore, dragging the charger will put your battery on the edge of danger for a long time. Lithium batteries are very delicate, and overcharging and discharging can cause huge damage to lithium batteries.

I have indeed heard news reports of battery explosions while playing and charging a mobile phone. My explanation for this is that because the phone is constantly charged while playing, if the charging protection circuit is not working or malfunctions, the battery may explode due to prolonged charging (overcharging) caused by playing for too long.

1. Does the battery generate a large amount of heat when charging?

Experiments have shown that lithium-ion batteries generate almost no heat during charging. Even at a high current of 1A and charging for 30 minutes, the temperature of the battery only rises by 1.5 degrees Celsius, which is almost imperceptible to the human body.

Lithium ion batteries only have a certain temperature rise under high current continuous discharge, and this temperature rise is not enough to reach the level of overheating. However, for general users, even if they continue to use the internet or make phone calls, the temperature rise of lithium-ion batteries is only 2.4 degrees Celsius. At a high current of 1A, discharging for 130 minutes and a temperature increase of 3 degrees Celsius, there is still a certain distance from heating, which can be almost negligible.

2. Will the instantaneous voltage during charging and communication really exceed normal levels by many times?

Through oscilloscope monitoring, it was found that:

A: When the phone is in standby mode, the voltage is stable and basically unchanged;

B: When charging a mobile phone, the voltage slightly increases (0.05V), and the actual voltage should be related to the battery characteristics and charging current. The rising voltage=battery internal resistance X charging current;

C: When making a phone call while charging, the voltage is lower than when charging only, because the call also consumes electricity.

3. The radiation during charging is also dozens of times higher than usual?

Although radiation testing is actually a very complex system, it would be great if the measurement uncertainty could be better than 15%. But the actual test data shows that charging is not related to phone radiation. There is no such rootless and unfounded assumption as tens of times.

Experimental conclusion:

1. When charging, the battery does not generate a large amount of heat.

2. The battery does not experience significant boost during charging and communication, and even slightly decreases during communication.

3. Charging is not related to the radiation level of the phone.

4. The most important thing is to use your phone with confidence when charging, as there are not as many dangerous things as you imagine.

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