How about using your phone while charging it?

1. Using the mobile phone while charging, the current density of the lithium battery will be greatly increased compared to the mobile phone battery used in the non-charged state. Increased circuit density can lead to lithium battery internal voltage drop increases, more electrochemical energy into heat Coulomb, heat generation further increases the internal resistance of the lithium battery, lithium battery continues to increase further the internal resistance and the heat generated by the Coulomb. Form a vicious circle. Finally, the overvoltage increases, and the charge and discharge voltage of the lithium battery detected by the safety voltage sensor provided on the back of the mobile phone is not really the charge and discharge voltage. As a result, the voltage will exceed the specified safe voltage potential window or cutoff voltage (cut -off), causing the chemical structure and composition of the lithium battery electrode material to be destroyed, the material structure collapses, and the performance is degraded. If it is serious, it may cause the battery to bulge or even explode.

2. Following the “warming up” section in the above section: Using the mobile phone while charging will cause the temperature to rise and the electrochemical environment of the lithium battery electrode to be forced to change. Under normal conditions, the electrochemical environment of a lithium battery is in a metastable state, and a solid electrolyte membrane (SEI membrane) formed by long-term electrode passivation on the anode surface of the anode material under metastable state will Decomposes in a sudden unsteady state and dissolves into the electrolyte. However, the SEI component is complex, and it is actually difficult to physically dissolve it by the electrolyte. Although the SEI film is a good conductor of lithium ions, its lithium ion conduction mechanism is not equivalent to a solid lithium ion electrolyte. In terms of performance, the two cannot be compared (see JES related papers for details). Therefore, the result is that the electrolyte is contaminated, the ionic conductivity of the lithium ion is lowered, the internal polarization of the battery is increased, the utilization efficiency of the battery is lowered, the cycling performance and the rate capability are lowered. Both are lowered.

3. Following the decomposition of the SEI film in the second article: the decomposed SEI film exposes the surface of the electrode material to the electrolyte environment. SEI film is not a good class, not very honest! Therefore, in the subsequent charging and discharging process, the SEI film is reformed on the surface of the electrode material and becomes thicker and thicker. This newly formed SEI film is not a secondary deposition of the originally decomposed SEI, but is reformed by electrochemical decomposition and precipitation of the electrolyte component. This process is a serious damage to the electrolyte, which results in a decrease in electrolyte performance and a decrease in battery performance.

4. Following the above three: the over potential is too large to continue charging and discharging. Originally, the cut-off of the lithium battery protects the battery and maintains the battery. However, due to the excessive battery over potential caused by the destruction and remodeling of the SEI, the electrochemical charge and discharge depth of the electrode material increases, and the electrode material The structural stability and morphology are all destroyed, the microstructure collapses, and the internal resistance (ion resistance and electronic resistance) increases. Therefore, the performance of the lithium battery is degraded, and the power is not as good as before.

I don't know if you have any similar experience. When you charge and discharge, you have used the phone a few times, and then you feel that the phone is not as good as before. This is it! My own mobile phone is a 2-yearcontact iPhone5 contract machine operated by AT&T. The price is cheap, so it is often used very waste and not maintained. Now often, when the phone's power is 8%-11%, the iPhone will automatically shut down. This is caused by the destruction, re-generation, destruction, re-generation, reciprocation of the SEI membrane, and the excessive potential.

Lithium batteries are best kept at a constant level. Don't wait until there is no electricity to recharge. When there is no electricity, the chemicals in the lithium battery will decrease, which will affect the battery life. While playing and charging, the battery that has a small impact on the battery may also explode. As for the background application, the Android system actually stops running when it retreats to the main page, so there is no need to worry about the power consumption of the background application. In addition, it does not matter if the lithium battery is turned on and off.

1. Try not to play games while charging.

Nowadays, many mobile games are very "hepatic", and it takes a lot of time to play in the game, and it is harder to play than PC games. The power of the mobile phone is limited, and there is no power when playing and playing. Therefore, netizens like to play games while charging, and keep online in real time. As everyone knows, because of the limited size of the body of the smart phone, the combination of the battery and the motherboard chip is very close. When the phone is running the game, the processor will keep a high load and the screen will remain on. This makes it easy to collect a large amount of heat inside the fuselage. This heat cannot be discharged to the battery even if it is discharged. The lithium battery used in smart phones is most prone to high temperatures, and charging at high temperatures for a long time has a great impact on the life of the battery.

Many mobile phones are prone to heat when playing games. When you plug in the power at this time, the heat generated during charging will be superimposed. People will feel hot when they touch, and the damage to the battery can be imagined. If you must charge while playing games, it is best to place the phone on a heat-dissipating surface such as glass or metal to protect the battery even if the heat is discharged.

Players who often need to play while playing games can choose some mobile phones that support low-voltage fast charging. Now OPPO's VOOC flash charging, one plus DASH speed flash charging, Huawei's SuperCharge is a low-voltage fast charge. The low-voltage fast charge reduces the internal pressure-down process of the mobile phone, so the heat will be smaller than the high-voltage fast charge, and charging while playing the game does not affect the fast charge effect.

2, do not use the computer's USB interface to charge the phone

Many players use the USB port of a PC to charge the phone for convenience. This is no problem in the past. However, the power consumption of the smartphone is increased, and the USB port current of the PC computer is generally only 500 mA. It is very reluctant to charge the mobile phone during standby. If the mobile phone is used while charging with the USB port of the PC, there is a possibility that the power supply may be insufficient. When such a battery is charged on one side, the other side also supplies power to the operation of the mobile phone, and it becomes charged while discharging. Sometimes when we play games while charging a mobile phone, we will find that the power is getting less and less, which is the case.

Therefore, if you want to charge while using your mobile phone, it is best to use the standard charger, do not use the USB port of the PC to charge, and do not use a brand-name charger of unknown origin. If you find that the phone's power does not increase or decrease during charging, you should stop using the phone immediately or replace the higher-powered charger.

Because the power consumption of the smart phone is very fast, many people will play while charging while playing the mobile phone. However, many people will say that playing the phone while charging will damage the battery and reduce battery life.

1. From the experience of daily use: First, the notebook can also be used while charging. When the amount of calculation is large, the current will suddenly increase, and the notebook will be fine. Second, when the mobile phone is connected to the computer through the data cable, it will also be charged, and the mobile phone memory will be operated. Is it not used while charging? Third, when charging, the phone does not shut down, the program is still running, even if we do not do anything, the operating system does not work?

2, from the circuit principle analysis: the charging line is to convert 220 volts AC to 5 volts DC (or directly from the USB port), then connected to the battery protection circuit, and finally connected to the battery, the protection circuit can ensure that the battery is not fully charged , no discharge after over discharge. Simply talk about the charging principle, you can think of the battery as a container. When charging, the power is flowing to the battery. At this time, the power required by the mobile phone is provided by the charger (Imagine that the battery charging and discharging is a channel.) When charging the battery, how can there be power output?). Therefore, the so-called side charging, in fact, the charger simultaneously supplies power to the battery and the mobile phone. When the battery is full, the protection circuit works, the circuit is cut off, the battery is no longer charged, but the battery is not discharged, as long as the charging circuit is followed. The phone will not be powered by the battery, but powered by the charger.

3, from the use of the situation: mobile phones, especially smart phones, there are many uses, traditional features to call, send text messages, new features online, play games, the most power-hungry is the display. From the above analysis, we know that the phone is powered by the charger when charging, but there is one exception, when the phone needs a very large current (do not know if this is the case), the charger can not provide, then The battery will discharge. Even so, the battery output is not as large as usual, because there is a charger to help it.

In short, there is only one channel for charging and discharging the battery, either charging or discharging. There is no problem of charging while charging. The conclusion is that there is nothing wrong with charging the mobile phone. If it is not troublesome, it will drag the charger and reduce it. The number of battery discharges to extend battery life. However, this is also risky, because no one can guarantee that the characteristics of the battery's charge and discharge protection circuit will never change and the quality will be foolproof, so dragging the charger, your battery will be on the edge of danger for a long time, lithium The battery is very delicate, overcharge and over discharge will cause huge damage to the lithium battery.

I have heard news reports about battery explosions while playing mobile phones. My explanation is: Because the mobile phone has been charged while playing, if the charging protection circuit does not work or malfunction, it takes too long to play. Causes the battery to charge for a long time (overshoot) and explode.

1. When the battery is charging, will it generate a lot of heat?

Experiments show that the lithium-ion battery is almost no heat when it is charged. Even with a large current of 1A, charging the battery for 30 minutes, the temperature of the battery is only increased by 1.5 degrees Celsius. Such a temperature is basically for the human body. It is not felt.

Lithium-ion batteries will only have a certain temperature rise in the case of continuous discharge with a large current, and this temperature rise is not enough to the extent of the hot, and the degree of use by the general user, even if the Internet continues to continually call, Lithium-ion batteries also have a temperature rise of only 2.4 degrees Celsius. Similarly, with a large current such as 1A, the discharge is 130 minutes, the temperature rises by 3 degrees Celsius, and there is a certain distance from the heat, which is almost negligible.

2. When charging and talking, will the instantaneous voltage really exceed many times in normal times?

Monitoring by oscilloscope found:

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

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

C: When the phone is charging, the voltage is lower than when it is only charged, because it consumes power when talking.

3, Is the radiation dozens of times than usual when charging?

Although the radiation test is actually a very complicated system, it is good that the measurement uncertainty is better than 15%. However, the actual test data shows that charging has nothing to do with cell phone radiation. There are no such tens of times of this unfounded assumption.

Experimental results:

1. When the battery is charging, the battery will not generate a lot of heat.

2. When the battery is charging and talking, there will be no big boost. Even when the call is still slightly reduced.

3, charging or not has nothing to do with the size of the phone radiation.

4, the most important point, please feel free to use the phone when charging, not as dangerous as you think.