How to correctly use electric lithium battery

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.

1, the charging

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. This leads to the following problem.

2, when in normal use should start charging

On the BBS, can often see this statement, because the number of charge and discharge is limited, so should be mobile phone battery electric light recharging as much as possible. But find a lithium ion battery charge and discharge cycle experiment table, data of cycle life are listed as follows:

Cycle lifetime (10% DOD): > 1000 times

Cycle lifetime (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, it’s a different matter if you are willing to take charge 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.

3, important for the proper use of lithium battery cell phone

To sum up, my most important tips on the charging and discharging problems of lithium battery mobile phones in use are:

1, according to the standard time and procedure charging, even so will three times before;

2, when there is a hint when battery power is too low, should try to start charging in a timely manner;

3, the activation of the lithium battery does not need special method, in the normal use of mobile phone lithium batteries will naturally activation. If you are determined to use of "three times before 12 hours long charging activation" approach, in fact there will be no effect. Therefore, all the pursuit of 12 hours long use the lithium battery cell phone charging and automatic shut down, are wrong. If you've made according to the error, please correct in time, maybe it is not too late. Of course, in the mobile phone and charger is under the condition of good quality, protection and control circuit for lithium battery protection still has quite a guarantee. So the understanding of charging rules is the key, in some cases, also can make some concessions. Such as found that mobile phone must be charge before you sleep at night, also can start charging before going to bed. The crux of the problem is that, should know what the right thing to do, and do not deliberately according to error.

Second, the battery maintenance

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 think that the first use of lithium batteries should be charged for more than 16 hours, so that the battery can be fully activated. In fact, this is not based on this. This is just the charging method of nickel-hydrogen or nickel-cadmium batteries that were popular in the past. Lithium-ion batteries were not applicable. Because this lithium polymer-based battery has no memory effect in theory, even if it is, it is completely negligible. So it only takes about 3 hours to rush. If the display is completed and you don't need an external power supply, you can unplug it and you don't have 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 the PSP is a product that has been in stock for more than one year, you don't need to do this because the battery cells are now activated at the factory and the battery is equivalent to activation when packaged into a PSP battery. The test, so the battery you got the hand, has already been activated, and then do three charge and discharge process is just a need to increase the loss of the battery.

Myth 2: The first charge must be charged for 12 hours. This is suitable for early NIMH battery devices without battery control circuits, but it is a joke for PSPs with intelligent charge and discharge control modules. When the PSP battery is fully charged, the charging current is automatically cut off and the system displays as “External Power”. Even if you continue to charge for 120 hours, the state will not change. In general, 3 hours is completely full, and the remaining "charging" is just a waste of your time. Instead, when you get a new machine, you should first discharge the battery and recharge it.

Myth 3: cells need once a month completely charged. 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 the battery, as long as once every 3 months for this operation.

Myth 4: Working while charging, or continuing to use external power after charging will damage the main unit and battery. This is the most ridiculous argument. The theoretical arguments of the so-called cavity electronics, sub-charges, etc., how much reaction can be obtained in practice? The battery industry academics firstly do not agree on this. The theory still has differences. How to guide consumers to use the actual battery? The loss of the battery is divided into normal loss and damage loss. The actual power consumption and the degree of loss caused by the use of the external power supply are completely within the normal loss range of the battery. That is to say, no matter how systematic the theoretical maintenance measures, the battery will be aging, which is like how magical cosmetics and maintenance cannot prevent the beauty from becoming an old woman, at most only delay, but the surface of the whitewash How much real utility can be, this is by no means a theory can explain - respect for the actual use of experience is the correct and scientific view of knowledge. Some people may say that the only way to avoid battery aging is not to use it (so many people choose to take the battery down), but this makes the PSP portability meaningless. Second, the battery is over time even in the sealed state. Extended and naturally aging. The battery is actually a semi-consumable product. As long as the battery brings you enough convenience and happiness, I think their sacrifice is valuable.

The page contains the contents of the machine translation.