How long does it take to charge a lithium-ion battery for the first time?

As for lithium-ion batteries, we are referred to as lithium batteries on weekdays . Daily life, lithium battery for us to use cell phones, laptops closely related to the current lithium using cell has been very deep and broad, but people use common sense for lithium batteries. How long does it take for the lithium-ion battery to charge for the first time? What is the correct charging method and discharge method for the lithium battery? What are the precautions for using the lithium battery? Let's look at these problems.

Lithium batteries are classified into lithium batteries and lithium ion batteries. At present, mobile phones and notebook computers use lithium-ion batteries, which are commonly referred to as lithium batteries. Currently, lithium-ion batteries used in mobile phones and the like, and true lithium batteries are not used in everyday electronic products because of their high risk.

Lithium-ion batteries have high energy density and high average output voltage. Self-discharge is small, less than 10% per month. There is no memory effect. The operating temperature range is -20 ° C ~ 60 ° C wide. It has excellent cycle performance, fast charge and discharge, charging efficiency up to 100%, high output power, and long lasting. Without environmental pollution, it is called a green battery.

How long does it take to charge a lithium-ion battery for the first time?

lithium battery

For laptop battery, mobile phone battery, camera, MP3\MP4\PSP lithium battery:

1. Whether it is a new battery or not, you can pull it out and use it. Generally, it will be full for 2-4 hours, and it will not be charged for 8 hours to 12 hours.

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 and is activated before the battery leaves the factory. If you insist on using the "first three 12-hour long charge activation" method, it will not actually work.

Lithium battery charging method:

(1) Standard charging method: charging at a constant current of 0.2C5 until the battery terminal voltage is 4.20V, and changing to constant voltage charging, until the charging current <0.01C5 is regarded as full.

The standard charging method is often used for calibration of battery capacity, which is rarely used in daily use because it is too slow to charge.

(2) Fast charging method: charging with 1C5 constant current until the battery terminal voltage is 4.20V, changing to constant current charging, to charging current <0.01C5.

Note on the fast charging method:

1 The initial charging current should not be too large, so as to avoid overheating of the battery and leakage and bursting.

2 When the battery terminal voltage reaches 4.20V, it must be switched to constant voltage immediately. The voltage requirement is high (error <0.5%), and must be measured with more than four and a half multi meters.

Lithium battery discharge method:

(1) Standard discharge method: discharge at a constant current of 0.2 C5 until the battery terminal voltage is 2.75V.

Because it is difficult to meet this condition in daily use, it is of little significance. This method is mainly used for calibration of battery capacity.

(2) Fast discharge method: Because the internal resistance of lithium-ion battery is very small, it allows large current discharge. At room temperature, discharge at 1C5 current can discharge for more than 54 minutes (more than 90%); 1.5C5 discharge time is more than 30 minutes; 2C5 discharge time More than 23 minutes; and allow for a shorter current discharge.

Lithium battery in the use of mobile devices

The most important tips for charging and discharging problems in lithium battery mobile phones:

1. Charge according to the standard time and program, even if it is the first three times, first plug the charger (line charge) into the power supply and then plug the output end of the charger into the charging port of the mobile phone (can be charged by the switch)

2, when the mobile phone low battery prompts, you should start charging as soon as possible; lithium battery is most vulnerable to damage in the case of over-discharge!

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.

Does the lithium battery have to be flushed for 12 hours in the first three times? Is the lithium battery activated?

Lithium battery correct charging method

For the "activation" problem of lithium batteries, there are many sayings: 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 nickel batteries (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 formal technical information I have reviewed emphasizes that overcharge and over discharge will make lithium batteries, especially liquid lithium. Ion batteries cause great damage. Therefore, charging is preferably done 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 after the battery is fully charged, there is no so-called “turbulent” charging that the nickel battery charger has 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 earlier, lithium batteries are very delicate, and they are much less resistant to fluctuations in charge and discharge than nickel, which in turn poses additional risks.

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.

The page contains the contents of the machine translation.