How to charge Li-ion battery for the first time
The lithium batteries we usually talk about are basically lithium-ion batteries. Cell phone batteries, laptop batteries, and electronic watch batteries are all polymer lithium-ion batteries. Because some devices are more expensive and are cherished, people are always at a loss when they buy new lithium-ion batteries for the first time. So what is the first charging method of lithium battery pack?
Method of charging lithium-ion battery:
⑴Standard charging method: 0.2C5 Charge with constant current until the battery terminal voltage is 4.20V, change to constant voltage charging, and it will be regarded as full when the charging current is less than 0.01C5. The standard charging method is often used to calibrate the battery capacity. Because the charging is too slow, it is rarely used in daily use.
⑵Fast charging method: charge with 1C5 constant current until the battery terminal voltage is 4.20V, change to constant current charge, until the charging current is <0.01C5.
Precautions for the fast charging method:
①The initial charging current should not be too large to prevent the battery from overheating, leaking, and bursting.
②When the battery terminal voltage reaches 4.20V, it must be switched to constant voltage immediately. The voltage requirement is relatively high (error <0.5%), and it must be measured with a four-and-a-half-digit multimeter.
⑴Standard discharge method: discharge at a constant current of 0.2C5 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 the calibration of battery capacity.
⑵Quick discharge method: Because the internal resistance of lithium battery pack is very small, large current discharge is allowed. At room temperature, it can discharge at 1C5 current for more than 54 minutes (above 90%); 1.5C5 discharge time More than 30 minutes; 2C5 discharge time is more than 23 minutes; and allow short-term larger current discharge.
How long does it take to charge the lithium battery pack for the first time?
1. Regardless of whether the lithium-ion battery is a new battery, it can be unplugged and used when it is fully charged. Generally, it takes 2-4 hours to charge it. Full, do not charge for more than 8 hours to 12 hours, it is harmful and useless;
2, when the phone battery is too low, you should try to start charging as soon as possible;
3, lithium ion The activation of the battery does not require a special method, it has been activated before the battery leaves the factory. If you insist on using the popular 'first three 12-hour long charge activation' method, it won't actually work.
The most important tips for charging and discharging lithium battery mobile phones in use:
1. Charge according to the standard time and procedure, even the first three times. Plug the charger (wire charge) into the power supply and then plug the output end of the charger into the charging port of the mobile phone (switching and charging can be done)
2. When the mobile phone battery is too low prompt, you should try to be as timely as possible Start charging; the lithium battery is most easily damaged in the case of over-discharge!
3. The activation of the lithium battery does not require a special method. The lithium battery will be naturally activated during the normal use of the mobile phone.
Should the lithium battery be fully charged for 12 hours in the first three times? Should the lithium battery be activated?
The correct method of charging the lithium battery
The 'activation' of the lithium battery pack The problem, many sayings are: the charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement of 'the first three charges should be charged for more than 12 hours' is obviously a continuation of the statement of nickel batteries (such as nickel-cadmium and nickel-metal hydride). So this statement can be said to be misinformation at the beginning. The charging and discharging characteristics of lithium batteries and nickel batteries are very different, and I can tell you very clearly that all the serious official technical materials I have consulted emphasize that overcharge and overdischarge will affect lithium batteries, especially liquid lithium. Ion batteries cause great damage. Therefore, it is best to charge according to the standard time and standard method, especially not to charge more than 12 hours. Generally, the charging method described in the manual of the mobile phone is the standard charging method suitable for the mobile phone.
In addition, mobile phones or chargers with lithium batteries will automatically stop charging when the battery is fully charged, and there is no so-called 'trickle' charging that lasts for more than 10 hours as a nickel battery charger. In other words, if your lithium battery is fully charged, it is also white charged 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 verge 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, the system will not only stop charging at this time, but also start a discharge-charge cycle. Perhaps the manufacturer of this approach has its own purpose, but it is clearly detrimental to the life of the battery and mobile phone/charger. At the same time, long-term charging takes a long time and often needs to be carried out at night. According to the situation of my country's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and their ability to withstand fluctuations in charging and discharging is much worse than that of nickel batteries, so this brings additional dangers.
In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for overdischarge, and overdischarge is also very detrimental to lithium batteries.
Li-ion batteries have high energy density and high average output voltage. The self-discharge is small, below 10% per month. There is no memory effect. The wide operating temperature range is -20℃～60℃. Excellent cycle performance, fast charging and discharging, charging efficiency up to 100%, and high output power. long lasting. There is no environmental pollution, it is called green battery, so it is widely used in various fields of life.
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