How long does the lithium battery charge for the first time?

Lithium-ion batteries, we are referred to as lithium batteries on weekdays. In daily life, lithium batteries are closely related to the use of mobile phones and laptops. At present, the use of lithium batteries has been very extensive, but people may not understand the common sense of lithium batteries. How long does the lithium-ion battery need to charge for the first time, and what is the correct charging and discharge method for the lithium battery? What are the precautions for using lithium batteries? With these questions we look down.

Lithium batteries are classified into lithium batteries and lithium ion batteries. At present, mobile phones and laptops 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. Excellent cycle performance, fast charge and discharge, charging efficiency up to 100%, and high output power. long lasting. Without environmental pollution, it is called a green battery.

How long does the lithium-ion battery charge for the first time?

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

1. Whether it is a new battery or not, it can be pulled out and used. 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 is shipped from the factory. If you insist on using the "first three 12-hour long charge activation" method that is circulated, it will not actually work.

Lithium battery charging method:

(1) Standard charging method: charging with 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, because charging is too slow and rarely used in daily use.

(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 multimeters.

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 is more than 23 minutes; and a longer current discharge is allowed.

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 charge 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?

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.

The page contains the contents of the machine translation.