How long does it take to charge a lithium-ion battery?

How long will it take for a lithium ion battery to be charged for the first time?

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

1, whether it is a new battery, full can be pulled out to use, generally charge 2-4 hours full, do not charge more than 8 hours to 12 hours, it is harmful;

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

Correct charging method of lithium battery:

(1) standard charging method: take 0.2c5 constant current charging to the battery terminal voltage of 4.20v, change to constant voltage charging, until charging current < 0.01c5 is regarded as full.

The standard charging method is often used to calibrate the battery capacity. Because charging is too slow, it is rarely used in daily use.

(2) quick charging method: the voltage from 1C5 constant current charging to the battery terminal is 4.20v, which is changed to constant current charging, and the charging current is < 0.01c5.

Notes for quick charging method:

(1) the initial charging current can not be too big, so as not to overheat the battery, leakage, burst phenomenon.

(2) when the battery terminal voltage reaches 4.20v, must be immediately turned into the constant voltage, the voltage requirement is higher (error <0.5%), must be measured with more than four and a half meters.

Lithium battery discharge method:

(1) standard discharge method: the voltage from 0.2c5 constant current to the battery terminal is 2.75v.

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

(2) rapid discharge method: because the internal resistance of lithium ion battery is very small, so allow large current discharge, at room temperature, at 1C5 current discharge can discharge more than 54 minutes (more than 90%); 1.5C5 discharge time for more than 30 minutes; 2C5 discharge time more than 23 minutes; And allow a short time more current discharge.

Notes on the use of lithium batteries in mobile devices

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

1. Charge according to the standard time and procedure, even the first three times. First, plug the charger (cable charging) into the power supply, and then plug the output end of the charger into the mobile phone charging port (charging on/off is acceptable).

2, when the phone power is too low, should try to timely start charging; Lithium batteries are most easily damaged in the case of over discharge!

3. No special method is required for the activation of lithium battery, which will be activated naturally in normal use of mobile phones.

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 "the first three charge to charge more than 12 hours", obviously from the nickel battery (such as nickel cadmium and nickel hydrogen) continued to say. 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 all 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 the 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, and there is no so-called "trickle" of charging that lasts for more than 10 hours. 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 to wander around. 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 and phone/charger life. 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 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.

Lithium batteries don't need to be recharged for more than 12 hours. That was the way batteries were charged in the early days.

After the lithium battery is placed for a period of time, it will enter the dormant state. At this time, the capacity is lower than the normal value, and the service time will be shortened accordingly. But lithium battery is 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, just full, do not overcharge.

The migration rate of lithium ions in electrolyte and electrode is closely related to temperature. When the temperature drops to below - 20 ℃, the electrolyte in the battery will be solidified, battery internal resistance will be infinity, the battery will not be able to use; When the temperature rises to more than + 55 ℃, the adverse event happens to produce a large number of gas, electrolyte electrode in resin bonding agent will deteriorate, causing the battery to aging and decline, even in the short term expires.

Lithium battery will discharge automatically, the self-discharge rate of each month is about 2%, a long time to place not to use, the battery will be damaged because of too put, it is recommended to charge them every few months, keep 40% of the electricity can be. Lithium battery is a kind of product easy to produce self-loss, the capacity of the battery will be irreversible physical attenuation over time, the loss value of the highest annual loss of 10%, when you buy the battery must look at the factory date, do not buy used goods.

Use the special lithium battery charger. When the lithium battery is connected to the charger, the indicator light will turn orange to start charging. When the lithium battery reaches the condition of full charging, the indicator light will turn orange to finish charging.

Note to use lithium battery:

After the battery is placed for a period of time, it will enter into a dormant state. At this time, the capacity is lower than the normal value, and the service time will be shortened accordingly. But lithium battery is easy to activate, as long as after 3-5 normal charge and discharge cycle can activate the battery, restore the normal capacity.

New lithium batteries do not require special methods or equipment during activation. This "natural activation" approach works best with standard charging methods.

The page contains the contents of the machine translation.