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Engage in mobile phone zero distance: why mobile phone batteries are not durable in winter

by:dcfpower     2021-03-18
u003cpu003eu003c/pu003e Many people have encountered the problem that the battery is particularly not durable when using a mobile phone in winter or in a cold environment. Originally, a mobile phone can last for 8 hours at full capacity. Why is it in winter? Can it only be used for six hours? It is mainly caused by the decrease in performance and capacity of the lithium battery pack in a low temperature environment.   Recently, yokii also encountered the same problem, but with the spirit of working on the phone, yokii decided to clarify the matter, whether the mobile phone or the battery is broken, or not. u003cpu003eu003c/pu003e  Through the data and battery test, we discovered a little secret about the battery of the mobile phone-in a cold environment, the battery capacity is reduced!    This is not a fantasy, it is indeed true . Generally, the battery capacity of our mobile phone, such as 3000 mAh, is only a theoretical value, and it is generally measured in an ideal state in an environment of 25°C. u003cpu003eu003c/pu003e   But in fact, the battery capacity is greatly affected by temperature.   Currently, the mobile phone batteries we use are generally lithium batteries, which are composed of a positive electrode, a negative electrode and an electrolyte between the positive and negative electrodes. When the battery is discharged, the negative electrode precipitates lithium ions through a chemical reaction, and moves to the positive electrode through the dielectric. At this time, the positive electrode is in the lithium-rich state and the negative electrode is in the lithium-poor state. During the lithium ion activity, the movement of electrons generates current. u003cpu003eu003c/pu003e  Temperature affects the speed of the chemical reaction of the battery. Too low temperature causes the chemical reaction of the lithium battery to be slow, so the discharge current becomes smaller, which directly leads to the reduction of the available capacity of the battery.   Therefore, many times we mistakenly believe that the lithium battery's discharge speed in winter has increased. In fact, the essence is that the battery capacity of the lithium battery pack itself has decreased. Is there any way to restore the battery power to a normal level, and at the same time, what tricks can yokii use to bring your dead phone back to life? If you find that the phone is dead, you can take the phone indoors or put it in Warm the clothes for a while. In short, let it warm up again, so that the phone can be used again, or a simpler way is to take out the lithium battery and rub it with the clothing, so that the temperature of the battery reaches normal temperature, so that the battery can be restored. Put the phone back in and it's ready for use again. u003cpu003e Through the study of the charging and discharging behavior of lithium batteries at different temperatures, it is found that as the temperature decreases, the charging performance of lithium batteries also deteriorates significantly, the constant current charging time becomes shorter and the constant voltage charging time increases. As the temperature decreases, the discharge performance of the lithium battery decreases significantly, the discharge platform decreases significantly, and the discharge capacity decreases significantly. u003c/pu003eu003cpu003e The reason is that as the temperature decreases, the conductivity and ion diffusion ability of polar materials, which are inherently poor, will drop significantly at low temperatures. The conductivity of the electrolyte decreases at low temperatures and the ion transmission capacity of the SEI membrane on the surface of the polar materials also greatly decreases. These factors cause the internal resistance of the lithium battery pack to increase, causing the capacity of the lithium ion battery to decline in the low temperature environment, and the discharge voltage platform Decrease, the output power becomes smaller under the same magnification. u003c/pu003eu003c/pu003e
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