Aug 15, 2019 Pageview：106
In the use of lithium battery should be noted that the battery after a period of time will enter the dormant state, at this time the capacity is lower than the normal value, the use time will also be shortened. But lithium battery is very easy to activate, as long as after 3-5 normal charge and discharge cycle can activate the battery, restore the normal capacity. Due to the characteristics of lithium battery itself, it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not need special methods and equipment during the activation process. Not only in theory, but in my own practice, the "natural activation" approach of standard charging from the beginning is the best. For the lithium battery "activation" problem, many people say: charging time must be more than 12 hours, repeated three times, in order to activate the battery. This "first three charges to charge more than 12 hours" is obviously a continuation of the nickel battery (such as nickel cadmium and nickel hydrogen) claims. So this kind of saying, can say to be misrepresented namely at the beginning. The charge and discharge characteristics of lithium battery and nickel battery are very different, and it can be very clear to tell you that all the serious and formal technical data I have looked up emphasize that overcharge and overdischarge will cause great harm to lithium battery, especially liquid lithium ion battery. Therefore, it is best to charge according to standard time and standard method, especially do not charge more than 12 hours. Usually, the charging method described in the manual of the mobile phone is the standard charging method suitable for the mobile phone.
In addition, a phone or charger with a lithium battery will automatically stop charging when the battery is fully charged. In other words, if your lithium battery is fully charged, it will go blank on the charger. And none of us can guarantee that the battery charge-discharge protection circuit characteristics will never change and the quality of foolproof, so your battery will be in danger for a long time around the edge. This is another reason we oppose long - term charging. In addition, on some mobile phones, if the charger is not removed after charging for a certain period of time, the system will not only not stop charging, but also start the discharging - charging cycle. There may be a purpose to this, but it is clearly detrimental to battery life and the life of the phone/charger. At the same time, long charging takes a long time and often takes place at night. In China's power grid, the voltage at night is relatively high and fluctuates greatly in many places. Having said that lithium batteries are delicate, they are much less resistant to fluctuations in charge and discharge than nickel ones, which poses additional risks. In addition, another aspect that cannot be ignored is that lithium battery is also not suitable for over discharge, over discharge on lithium battery is also very bad. This leads to the following question.
2. When should I start charging in normal use
On BBS, you can often see this saying, because the number of charge and discharge is limited, so you should use up the battery of the mobile phone as much as possible to recharge. However, we found an experimental table about the charge and discharge cycles of lithium ion batteries, and the data about cycle life are listed as follows:
Cycle life (10%DOD) : >1000
Cycle life (100%DOD) : >200
DOD stands for discharge depth. As can be seen from the table, charging times are related to discharge depth, and the cycle life of 10%DOD is much longer than that of 100%DOD. Of course, if the relative total capacity of actual charging is converted into: 10%*1000=100, and 100%*200=200, the latter is better than the former. Under normal circumstances, you should have reservation according to battery remaining quantity of electricity is used up again charge principle is charged, but if the battery is in, the 2nd day cannot hold to when whole daytime impossibly, should begin to charge in time, if be willing to carry charger of course to the office when do not talk again. Even if the battery has a lot of power left, you can charge it ahead of time. You don't really lose "1" charge cycle life, which is "0.x" times. The principle of recharging after a battery has run out of juice is not to take you to extremes. As popular as long charging is, "try to use up your phone's battery, preferably by shutting it down automatically." This is really just a nickel battery, designed to avoid memory effects, but unfortunately it also works on lithium batteries. There have been examples of people who continue to use their phones without charging after warnings that their batteries are low. As a result, the mobile phone in this example did not respond to the later charging and starting up, so it had to be sent to customer service for maintenance. In fact, this is because the battery voltage is too low due to excessive discharge, so that it does not have the normal conditions for charging and starting up.
3, the correct use of lithium cell phone important tips
To sum up, my most important tips for charging and discharging problems in the use of lithium-ion cell phones are as follows:
1. Charge according to standard time and procedure, even the first three times;
2, when the phone power is too low, should try to timely start charging;
3. No special method is required for the activation of lithium batteries, which will be activated naturally in normal use of mobile phones. If you insist on using the popular "first three 12-hour long charging and activating" method, it won't actually work. So all the pursuit of 12 hours of super-long charging and automatic shut-down of lithium-ion cell phones is wrong. If you have done something wrong before, please correct it before it is too late. Of course, in the mobile phone and charger own protection and control circuit quality is good, the protection of lithium battery is quite guaranteed. Therefore, the understanding of charging rules is the key, and some concessions can be made in some cases. For example, if you find that your phone needs to be charged before you go to bed at night, you can start charging it before you go to bed. The point is to know what the right thing to do is and not to try to do it wrong.
Ii. Battery maintenance
In fact, the battery is not too much to take care of the use of attention, in other words, is not too much to take care of the use of. How many times a battery can be used depends more on individual differences in how the battery is made than on how it is used. In addition to the quality of the battery itself, the battery's own life is limited. Once the battery is off the production line, its life begins to fade. Lithium batteries last two to three years, whether you use them or not. One of the main reasons for the decline in battery capacity is the increase in internal resistance due to oxidation, and eventually the resistance of the electrolyzer reaches a point where the battery cannot release the stored charge even though it is fully charged. 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 such batteries, which have a lithium-polymer core, theoretically have no memory effects, even if they do, they are negligible. Therefore, it only takes about 3 hours to charge. If it is shown that the charging has been completed and no external power supply is needed for the time being, then the power supply can be unplugged and there is no need to wait for such a long time.
Myth 1: the PSP needs to be charged and discharged three times in order to activate the battery. Unless you buy the PSP is the inventory of products more than one year, otherwise there is no need to do this, because now the batteries batteries have been activated in the factory, the batteries when encapsulated into a PSP batteries after an equivalent to activate test again, so you get its hands on the battery, already had been activated, only three times of charging and discharging process cost anymore to increase the wastage of the battery.
Myth 2: the first charge must last 12 hours. This is true of early nickel-metal hydride battery devices without battery control circuits, but it is a joke for today's PSP with smart charging and discharging control modules. When the PSP battery is fully charged, the charging current will be automatically cut off and displayed as "external power supply" in the system. Even if you keep charging for 120 hours, the state won't change at all. Generally speaking, 3 hours is full, and the rest of the "charging" is just a waste of time. Instead, when you get a new machine, you should light it up before you charge it.
Myth 3: batteries need to be fully charged and discharged once a month. For nimh battery memory effect is very strong, this is must work, but for lithium-ion batteries, the cycle is too frequent, lithium battery, in theory, is to eliminate the memory effect, even if there were, also has been greatly weakened the negligible degree, if you use the battery is very frequent, then you should discharge the battery to the low (about 10 ~ 15%) recharging, but if the discharge to even open machine (0 ~ 1%), belong to the lithium battery has great damage depth of discharge, usually once every 2 months to do this operation. If you rarely use batteries, you can do this once every three months.
Myth 4: working while charging, or continuing to use external power supply after charging will damage the host and battery. This is the most ridiculous argument. How much of the theoretical argument about the mechanism of hole electron and secondary charge can be obtained in practice? First of all, the view of the battery industry academia is not unified. The theory is still divided, how to guide the actual use of consumers? Battery consumption is divided into normal loss and damage loss, the power converter using and the degree of loss of charge while using the real cause, completely within the normal wear and tear, the battery that is to say, no matter how theoretical maintenance measures system, battery is aging, it's like how the magic of cosmetics and maintenance also can not stop the beauty become old woman, most are just slow, but on the surface of the plaster of utility can exactly how many truly, this is by no means theory can explain the actual use experience is correct - respect and understanding of the scientific concept. It may be said that the only way to avoid battery aging is not to use it (so many people choose to take it off), but this makes the PSP's portability meaningless, and the battery naturally ages over time even when it is sealed. Batteries are actually a semi-consumable commodity, and I think their sacrifice is valuable as long as they provide you with enough convenience and happiness.
Frequent deep charge and discharge: lithium battery has almost no memory. Many people like to use the battery to the last bit (protection plate protection) and then charge it when they use lithium tram or lithium digital products. In the eyes of many people, this is also a way to activate the battery. In the use of lithium batteries, the use of electricity to recharge the situation is called deep charge and discharge.
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