Welcome to the hedgehog gang. Share some tips on lithium battery devices today. Can I charge my cell phone all night long? Did you know that battery temperature also affects battery life when charging? And how to judge the number of charging cycles of lithium batteries? And what kind of charging habits will greatly reduce the life of your lithium battery? Are there any tips to optimize the life of lithium batteries? And teach you how to manually charge the removable lithium battery around you! Then we will tell you the truth! The frog of the mind has been touching your stomach. Thank you very much. Let's first introduce the history of common batteries in portable devices. I divided it into two categories. The first type is the common dry battery. Including carbon-zinc battery and alkaline battery. These are disposable batteries. When there is no electricity, it needs to be recycled and discarded. It feels wasteful. So it extends to a rechargeable battery. Ni-CD battery and Ni-MH battery A friend of a little age used to play with four-wheel drive when he was a child. I knew that Ni-CD rechargeable battery The characteristic is that the output current is large but the capacity is small. It is as fierce as a god when it is used in a self-made motor four-wheel drive (A reveals his age). (Ah revealed his age.) But the memory effect is very obvious. It is almost necessary to fully discharge the electricity and recharge it before it can be fully charged. Under the requirement that the standby time of portable devices should be as long as possible. The mainstream has been changed to Ni-MH battery. In addition to the capacity And improve the memory effect of the battery. The second category is today's topic: lithium batteries. His capacity density is higher than that of Ni-MH battery. More completely solved the shortcomings of the battery memory effect. The size can be made flat. It can be changed according to the size of battery capacity. So almost all mobile phone batteries are of this type. At the same time, it can also be made into cylindrical ones. Our flashlights, mosquito rackets, mobile fans, etc. Most of them are cylindrical batteries of model 18650. Even Tesla electric car It is also a super-large energy storage battery integrated by hundreds of cylindrical lithium batteries. Sizes from 18650 to 21700 Up to now, 4680 (46800) are cylindrical batteries. However, at present, most of the portable devices that can replace lithium batteries are still 18650. Then no matter what shape the lithium battery is, The chemical ways of storing electrical energy inside are roughly the same. So let's talk about lithium batteries today. The lithium battery has no memory effect. So you don't have to discharge and recharge like a Ni-CD battery in order to be full. More seriously, lithium batteries must not be used until the battery is completely dead! In the past, the news used to report that the battery inside the phone or tablet was pregnant and wrapped up. Even explode and catch fire. Chengdu is due to the excessive discharge of lithium batteries When the lithium battery is very low, The chemicals inside will crystallize from the liquid. When these crystals have been growing up, It will pierce the layers of thin film insulation in the lithium battery. Cause a slight short circuit These slight short circuits will vaporize the liquid chemicals inside. You will find that the battery is pregnant! At this point, it means that there is already a short circuit in some areas inside the battery. At this point, even if the battery is not using it, It will also continue to run out of electricity internally. Resulting in the feeling that the battery capacity is becoming more and more unusable. There is even a danger of heat and explosion. This is why we often see that the replaced batteries are in the state of drum bags. So in order to avoid crystallization inside the battery Try not to let the lithium battery charge be less than 20%. At the same time, if you don't use lithium batteries for a while, It is recommended that the electricity be kept between 50 and 80%, and the life span is longer. Because 100% of the power for a long time It will also cause a slight increase in the pressure of the chemicals inside the battery. So for example, some notebook will find that you have external power supply for a long time. The computer will set the lithium battery at 80% to protect the battery. Then there is another effect on lifespan that is very obvious. What is often overlooked is the temperature. Some people say that fast charging of mobile phones hurts the battery of mobile phones. In fact, fast charging doesn't necessarily hurt the battery. Whether you are using a 5V 1A old charger Or a more high voltage fast charging protocol charger. The main influence is the battery temperature when charging. In fact, relatively high-end electronic equipment At extremely low or extremely high temperatures below zero Will stop the phone from charging or even stop working. Because at extreme temperatures, It is not conducive to the conversion between chemical energy and electric energy in lithium battery. So if you are charging in fast charging mode The mobile phone is playing CPU-consuming games again. Plus a thick mobile phone case with good heat preservation. There's a good chance that the lithium battery you're charging is always at a temperature of nearly 50 degrees. Then the pressure in the battery will increase. It will also lead to the risk of chemical gasification and expansion. This is also a big taboo on the life of lithium batteries. So remember when the mobile phone is charged quickly. Minimize the high-performance operation of mobile phones Remove the phone case if necessary and strive for more opportunities to dissipate heat As long as the phone is not obviously hot when charging That won't affect the battery life. Let's talk about the number of cycles. At present, the life index of lithium battery is usually based on the number of cycles. For example, 500 times 80% That is, after 500 cycles Even if you are full The battery capacity will only be 80% of that of the new era. None of us are professional battery experts. But does 500 times sound rare? Does it feel like it's here all of a sudden? Actually this is not so Because the number of cycles is from 100% to 0% is a cycle. But didn't I just say that the battery should not be less than 20%? So in fact, the situation may be 60% to 20%, a total of 40%. This means that only 0.4 cycles can be counted. On the contrary, You charge 20% to 70%, which is only 0.5 cycles. Suppose the charge in both days is 0.5 cycles. That adds up to one cycle. And so on until it accumulated to 500 cycles The battery will become full up to 80%. So in fact, there is no problem that it can be used for several years in this way. Because of this, too. The characteristic of lithium battery is to charge whenever you want. Intermittently recharge to full With a surge of energy and full charge It's the same for lithium batteries. It makes no difference. You can rest assured that you can charge as much as you want. On the contrary, it is more important not to let the battery run out and let the internal crystallization. Finally, there is one more thing. If your spare phone or portable device with a lithium battery has not been used for a while In order to keep the chemical composition of lithium battery active It is suggested that it can have a charge-discharge cycle once a month. Lithium batteries will not forget that they can still recharge! I mean it! If you haven't used it for too long The battery really forgets that it can recharge. Finally, can the phone be recharged all night? Here, by the way, we will teach you how to charge lithium batteries. To verify the problem. We took out the adjustable power supply. First, observe the parameters on the battery. It has voltage and capacity (slip of the tongue) mark. If you only have the model, you can check the specifications online. Usually the most common lithium battery is ternary lithium battery. His normal voltage is 3.7 V, the filling voltage is 4.2 V. So we set the upper limit of the power supply voltage to 4.2V. Usually based on battery capacity Assume that the battery capacity is 1100mAh It is recommended that the charging current should not exceed 1100mA. So we set the current limit at 1000mA. If the power supply can only set the voltage Never charge lithium batteries! Remember After the power supply is set First use the ammeter to measure the polarity of the battery After confirming the positive and negative electrodes of the lithium battery Then connect the adjustable power supply. Confirm the polarity! Confirm the polarity! Confirm the polarity! It's important to say it three times. After confirming the polarity Then connect to the power supply with a crocodile clip So as not to burn down the power supply. If you are a cylindrical lithium battery You can clip a NdFeB powerful magnet as a medium and it can be attached to the battery. Then we observe the change of charging voltage and current. Under the condition of low battery capacity Will be charged at the current limit. Until the battery is almost full. The current will slowly drop by itself. It won't even recharge any more. This means that in the correct charging mode Even if the phone has been charged all night, When the lithium battery is fully charged, it will stop entering the charge by itself. So there is no risk of overcharging the lithium battery. You can rest assured to recharge. After the phone is fully charged, The charger will be changed to supply only the power used by the mobile phone. Until you unplug the charging cord. Do you have a better understanding of the characteristics of lithium batteries? You also know how to extend the battery life of your mobile phone. If you have more tips on charging, you can also leave a message below and share it with you. I'll see you next time.
