Feb 20, 2019 Pageview:700
The lithium battery is good, now the ordinary battery is slowly being eliminated! Lithium battery is now the mainstream battery series, the endurance ability is greatly improved compared with the ordinary, the internal resistance loss is small and the capacity is large.
Although lithium batteries are widely used, they are used in automobiles, electric vehicles, mobile phones, tablets, notebooks, etc. In the near future, there may be more equipment to use it, but at present, mobile phones and tablets, etc. The device is still the closest lithium battery powered device to us. Therefore, it is necessary to make special instructions for the mobile phone lithium battery.
In the use of lithium batteries, it should be noted that after the battery is placed for a period of time, it enters a sleep state. At this time, the capacity is lower than the normal value, and the use time is also shortened. However, the lithium battery is easy to activate, as long as the battery is activated after 3 to 5 normal charge and discharge cycles, and the normal capacity is restored. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only in theory, but from my own practice, it is best to use a standard method of charging this "natural activation" method from the beginning. For the "activation" problem of lithium batteries, many sayings are: charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement that "the first three charges have to be charged for more than 12 hours" is obviously a continuation of the nickel battery (such as nickel cadmium and nickel hydride). So this kind of statement can be said to be misinformation at the beginning. The charge and discharge characteristics of lithium and nickel batteries are very different, and it is very clear to tell you that all the serious official technical information I have reviewed emphasizes that overcharge and over-discharge will be lithium batteries, especially liquid lithium. Ion batteries cause great damage. Therefore, charging is preferably performed in accordance with standard time and standard methods, especially for ultra-long charging of more than 12 hours. Usually, the charging method described in the mobile phone manual is a standard charging method suitable for the mobile phone.
In addition, the lithium battery phone or charger will automatically stop charging when the battery is full, there is no so-called "turbulent" charging of the nickel battery charger for 10 hours. In other words, if your lithium battery is full, it will be white charger on the charger. And none of us can guarantee that the characteristics of the battery's charge and discharge protection circuit will never change and the quality will be foolproof, so your battery will be on the edge of danger for a long time. This is another reason why we oppose long charging. In addition, on some mobile phones, after charging for more than a certain period of time, if you do not remove the charger, then the system will not stop charging, and will start the discharge-charge cycle. Perhaps the manufacturer of this approach has its own purpose, but it is clearly unfavorable for the life of the battery and the phone/charger. At the same time, long charging takes a long time and often needs to be carried out at night. In the case of China's power grid, the voltage at night is high in many places and fluctuates greatly. As mentioned above, the lithium battery is very delicate, it is much less resistant to fluctuations in charge and discharge than nickel, and this brings additional danger. In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over-discharge, and over-discharge is also disadvantageous for lithium batteries.
In the forum, you can often see this statement, because the number of charge and discharge is limited, so the battery power of the mobile phone should be recharged as much as possible. But find an experimental table on the charge and discharge cycle of lithium-ion batteries. The data on cycle life are listed below:
Cycle life (10% DOD): >1000 times
Cycle life (100% DOD): >200 times
Among them, DOD is the abbreviation of depth of discharge. As can be seen from the table, the number of chargeable is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that of 100% DOD. Of course, if the relative total capacity is reduced to the actual charge: 10% * 1000 = 100, 100% * 200 = 200, the latter's full charge and discharge is still better. Under normal circumstances, you should reserve the battery according to the principle that the remaining battery power is used up and recharge, but if the battery is not expected to last for the whole day on the second day, you should start charging in time, of course, if you are willing to charge It’s a different matter to go to the office. And when you need to charge to cope with the expected important events that will cause the communication to be busy, even if the battery still has a lot of power, then you only charge in advance because you have not really lost the "1" charge cycle life. It is only "0.x" times, and often this x will be small. The principle that the remaining battery power is used up and refilled is not to go to extremes. One of the more widely spread sayings like long charging is that "try to use up the battery power of the mobile phone, it is best to use automatic shutdown." This practice is actually only a nickel battery. The purpose is to avoid memory effects. Unfortunately it is also circulating on lithium batteries. Some people have used the example of automatic shutdown since they have been warning that the mobile phone battery is too low. As a result, the mobile phone in this example did not respond during the subsequent charging and booting, and had to be sent to the customer service for repair. This is actually caused by the battery being over-discharged and the voltage is too low, so that it does not have normal charging and power-on conditions.
To sum up, my most important tips on the charging and discharging problems of lithium battery mobile phones in use are:
1. Charge according to standard time and procedures, even if it is the first three times;
2. When there is a low battery power prompt, you should start charging as soon as possible;
3. The activation of the lithium battery does not require a special method. The lithium battery will naturally activate during normal use of the mobile phone. If you insist on using the "first three 12-hour long charge activation" method that is circulated, it will not actually work. Therefore, all the pursuit of 12 hours of ultra-long charging and the use of lithium battery mobile phones to automatically shut down is wrong. If you have done it in the wrong way, please correct it in time, maybe it is not too late. Of course, in the case of good quality of the mobile phone and charger protection and control circuit, the protection of the lithium battery is quite guaranteed. So the understanding of the charging rules is the key point, and in some cases it is also possible to make some concessions. For example, if you find that your phone must be charged before you go to sleep at night, you can also start charging before going to bed. The point is that you should know what the right approach is and don't deliberately follow the wrong way.
In fact, there is not much use in the battery to pay attention to, in other words, it is not too much to consider. How many times a battery can be used, the difference is more from the individual differences in the manufacture of the battery itself, rather than the method of use. In addition to its own battery quality, the life of the battery itself is limited. Once the battery is off the production line, its life begins to pass. Lithium batteries last for only two to three years, whether you use them or not. One of the important reasons for the drop in battery capacity is due to the increase in internal resistance caused by oxidation. Finally, the resistance of the cell will reach a certain point. Although the battery is fully charged, the battery cannot release the stored amount. Many friends believe that the first use of lithium battery should be charged for more than 16 hours, so that the full activation of the battery, in fact, there is no basis for doing so, this is the popular nickel hydrogen or nickel cadmium battery charging method, for lithium ion battery is not applicable. Because the lithium-ion polymer at the core of the battery in theory no memory effect, if there is, is completely negligible. Therefore, it is perfectly ok to charge the battery for only about 3 hours. If it is shown that the charging has been completed, and external power supply is not needed for the time being, then the battery can be unplugged and there is no need to wait for such a long time.
Avoid excessive discharge. When the device prompts “The battery is low”, it should be charged; until the device is automatically turned off, it will be charged, and the battery has been over-discharged. This can affect battery life.
Avoid overcharging. When the charger is full, you should unplug the charger. Nowadays, the charger generally has a design that is full of self-stopping. It is no problem not to remove the battery from the charger for a short time, but the battery is left on the charger for a long time, and the voltage of the grid rises late at night, the charger that has stopped charging. After the voltage rises, it will continue to charge, causing the battery to be overcharged. This can affect battery life.
If the lithium battery is not used for a long time, it should be charged to 60%, stored separately in a cool and dry place, and recharged every 4 or 5 months.
Avoid battery short circuit, large current discharge, which is not good for battery life.
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