Correct charging method for Lithium Battery

I used to read a lot of comments about power-off and charging on the altar. I am misled by myself. Now I have found a comparison.
I hope you know something about it. I put it on the mobile phone version before, but it seems that you didn't see it.

When using a lithium battery, it should be noted that the battery enters sleep state after being placed for a period of time, the capacity is lower than the normal value, and the use time is shortened. However, the lithium battery can be easily activated, and the battery can be activated after 3-5 normal charging and discharging cycles to restore the normal capacity.

Because of its own characteristics, the lithium battery has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and devices during the activation process. Not only in theory, but in my own practice, the "natural activation" method of charging with the standard method was the best from the very beginning.

Many sayings about the "activation" problem of lithium battery are that the charging time must be over 12 hours, and the battery must be retried three times to activate the battery. This "charge for the first three times is charged for more than 12 hours" is obviously a continuation of the statement from the nickel battery (such as nickel-cadmium and nickel-Mh. Therefore, it can be said that it was a false positive at the beginning. The charging and discharging characteristics of lithium battery and nickel battery are very different, and can be clearly told to everyone, all the serious official technical materials I have read have emphasized that charge and discharge can cause great damage to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge according to the standard time and standard method, especially do not charge over 12 hours. Generally, the charging method described in the mobile phone manual is a standard charging method suitable for the mobile phone.

In addition, the cell phone or charger of the lithium battery will automatically stop charging after the battery is full, and there is no such thing as a "streaming" charge that lasts for more than 10 hours. That is to say, if your lithium battery is fully filled, it is also a white charger. No one of us can guarantee that the battery charging and discharging protection circuit features will never change and the quality will be safe, so your battery will be on the verge of danger for a long time. This is another reason for us to oppose long charging.

In addition, if you do not remove the charger after charging for a certain period of time on some mobile phones, the system will not only stop charging, but also start discharge-charging cycle. The vendor may have its own purpose, but it is obviously unfavorable for the lifetime of battery and cell phone/charger. At the same time, long Charging takes a long time and often needs to be carried out at night. However, in the case of China's power grid, the voltage at night is high in many places, and the voltage fluctuates greatly. As we have already said before, lithium battery is very delicate. It is much inferior to the ability of nickel power to withstand fluctuations in charge and discharge, which brings additional risks.

In addition, the lithium battery is not suitable for overdischarge, And the overdischarge is also very unfavorable to the lithium battery. This raises the following question.

2. When should I start charging normally?

In our forum, we often see this saying, because the number of charge and discharge times is limited, so we should use up the power of the cell phone battery to charge again. However, I found an experiment table on lithium-ion battery charging and discharging cycles. The following figure shows the cycle life data:

Cycle Life (10% DOD):> 1000 times

Cycle Life (100% DOD):> 200 times

DOD is the abbreviation of discharge depth.

As can be seen from the table, the number of recharges is related to the discharge depth. The cycle life of 10% DOD is much longer than that of 100% DOD. Of course, if it is equivalent to the actual total charge capacity:

10% * 1000 = 100

100% * 200 = 200. It is better to fully charge and discharge the latter, but the comments of the previous netizens should be corrected: under normal circumstances, you should recharge your battery with reservation based on the remaining battery usage principle, but if your battery is expected to be unavailable for 2nd days
If you are willing to carry the charger to the office, you should start charging in time during the whole day.

And you need to charge the charge to cope with important events that will lead to busy communications, even if the battery is still
When there is a lot of power remaining, you just need to charge in advance, because you do not really lose the "1" charge cycle life, that is
It is "0. X" times, and often this X will be very small.

The principle of remaining battery power usage and re-charging does not require you to go to the extreme. Like long charging,
It is "try to use up the battery power of the mobile phone, it is best to use automatic shutdown ". In fact, this is only the practice of nickel battery,
The purpose is to avoid the memory effect, unfortunately it is also circulating on lithium batteries. Low warning.Some people once used automatic shutdown because their cell phone batteries are still not charged. Result In this example, the mobile phone
No response was made during subsequent charging and startup, and the customer service had to be sent for repair.. This is actually caused by excessive battery discharge.
The voltage is too low, so that it does not have normal charging and boot conditions.

3. The correct method for lithium battery cell phones comes down to the following:

1,Charge according to Standard Time and procedures, even the first three times;　　

2,When the cell phone power is too low, you should start charging as soon as possible;

3. Lithium Battery activation does not require special methods. The lithium battery will be activated normally on the mobile phone. If you insist on using the "first three 12 hours long charge activation" method, it will not actually work.

Therefore,All the 12-hour ultra-long charging and the use of lithium battery cell phones to automatically shut down are incorrect. If you used to follow the incorrect statement, please correct it in time. It may not be too late.
Of course, the protection for lithium batteries is quite guaranteed when the cell phone and charger protect and control the circuit quality well. Therefore, the understanding of charging rules is the focus, 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 before going to bed. The key to the problem is that you should know what the correct approach is and do not deliberately follow the wrong statement.