The lithium battery of the mobile phone is mainly composed of a plastic case upper and lower cover, a lithium battery core, a protection circuit board (PCB) and a recoverable fuse (polyswitch). Some manufacturers also have components such as NTC, identification resistors, vibration motors or charging circuits.
The functions of each part are as follows:
(1) Lithium battery: Provides charge and discharge power.
(2) Protection circuit board (PCB): Prevent battery overcharge and over-discharge.
(3) Recoverable fuse (PTC): The positive thermistor protects against high temperature and protects the circuit board from double protection.
(4) Recoverable fuse (NTC): A negative thermistor that senses the internal temperature of the battery for low temperature protection.
(5) Identification resistance: identify the original battery, non-original battery can not be used
Among them, the battery core is very important, and the movement also has several levels, there are A-class batteries, B-class batteries.
two. The correct method of charging and discharging lithium battery of mobile phone
The correct method of charging the mobile phone lithium battery Now the mobile phone uses a lithium-ion battery, so there is no memory effect problem, and there is no need to activate. The first charge does not need to be flushed for more than 12 hours like nickel, and only needs to charge for about 4 hours. The life of an ion battery is only related to the number of times of charging, and the lithium ion battery can be charged about 1000 times. Standby time is related to usage. However, selling mobile phones said that the previous three charging times should reach 12 hours. what happened?
The battery is the source of mobile phone power, that is, the power of the mobile phone. Without the power supply of the battery, the mobile phone is a piece of scrap iron. A high-capacity high-performance battery can not only give the mobile phone a long battery life, but also protect the circuit of the mobile phone. This allows the mobile phone to work efficiently for a long time, and vice versa, it is likely to cause unexpected damage to the mobile phone. For our players, the performance of the battery is already characterized when it leaves the factory. The size of the battery and the performance are determined by the battery itself. In this respect, we can't change it artificially. This is not to say that we can't do it after we get the battery. The mobile phone uses a lithium-ion rechargeable battery. When the internal storage power is used up, it needs to be recharged to replenish the power. Don't underestimate the charging process. A good charger and correct charging method can keep the battery's standby time for a long time and extend the battery life. Further, you can also protect your phone. As for how to charge, there will always be players in the forum asking, after a period of actual use and reference, I summed up the following points:
1. How to charge a new battery
In the use of lithium batteries, it should be noted that after the battery is placed for a period of time, it enters a sleep state. At this time, the capacity is lower than the normal value, and the use time is also shortened. However, the lithium battery is easy to activate, as long as the battery is activated after 3-5 normal charge and discharge cycles, the normal capacity is restored. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect.
For the "activation" problem of lithium batteries, many claims 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 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 overdischarge 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. This leads to the following problem.
2. When should I start charging during normal use?
In our forum, we can often see this statement, because the number of charge and discharge is limited, so the battery of the mobile phone should be recharged as much as possible. But I am looking for
To an experimental table on the charge and discharge cycle of a lithium-ion battery, the data on cycle life are listed below:
Cycle life (10% DOD): > 1000 times
Cycle life (100% DOD): > 200 times
3, the correct practice for lithium battery mobile phones
To sum up, my most important tips on the charging and discharging problems of lithium battery mobile phones in use are:
a Charging according to standard time and procedures, even in the first three times;
b When the mobile phone is low, you should start charging as soon as possible;
c Lithium battery activation does not require a special method, the lithium battery will naturally activate during normal use of the phone. If you insist on using the "first three 12-hour long charge activation" method, it will not actually work.
Therefore, all the pursuit of 12 hours of ultra-long charging and the use of lithium battery mobile phones to automatically shut down are wrong. If you used to do it in the wrong way,
Please correct it in time, maybe it is not too late.
Of course, in the case of good quality of the mobile phone and charger protection and control circuit, the protection of the lithium battery is quite guaranteed. So the understanding of the charging rules is the focus, and in some cases it is also possible to make some concessions. For example, if you find that the phone must be charged before you go to sleep at night, you can also start charging before going to bed. The point is that you should know what the right approach is and don't deliberately follow the wrong way.
The charging and discharging of mobile phone lithium battery is very particular, and some brand batteries can make the battery charge and discharge times more.
4, use lithium batteries to pay attention to fire
Many people may be familiar with lithium batteries from their mobile phones. In fact, it is used in many home appliances. Undoubtedly, the advantages of high efficiency and light weight of lithium batteries are promptly popularizing and applying them. However, do you know that if you use it carelessly, it will also make you "fire" the upper body?
The lithium battery has the advantages of light weight, high efficiency, low temperature resistance (-40 ° C), etc. The 0.3 mm thick, stamp-sized lithium battery can be used continuously for more than 5 years. In recent years, the alkaline dry battery and manganese battery are widely used. Used in many high-end appliances and mobile phones.
The lithium battery is different from the zinc chloride and potassium hydroxide water-soluble electrolytes of the existing manganese battery and the alkaline dry battery, and it uses an organic solvent. The positive electrode of the lithium battery is made of manganese dioxide, lead fluoride or thionyl chloride. The lithium metal foil used for the negative electrode has a stronger ionization tendency and a larger voltage difference between the positive and negative electrodes than the zinc chloride used in the negative electrode of the general battery, thereby improving the working efficiency of the lithium battery.
However, lithium batteries often have heat and burning during use, which affects the use of the host, and severely burns the host to cause a fire. According to reports, in recent years, there have been many home fire accidents caused by the burning of lithium batteries.
Then why does the lithium battery heat up and burn? Many of the materials in the original lithium battery can react with water, and a strong chemical reaction can occur and a large amount of heat can be released to cause heat and combustion. The manganese dioxide of the positive electrode of a lithium battery can be heated only by a small drop of water. When the thionyl chloride in the lithium battery is in contact with water, it releases heat energy while generating hydrochloric acid and sulfur dioxide. Several factors make the lithium battery a "fire" in life. Therefore, people must pay attention to waterproof and anti-proof when using lithium batteries. Wet. After the various hosts are deactivated, the lithium battery should be taken out and stored in a dry and low temperature to prevent and avoid the occurrence of household fire accidents caused by improper use of the lithium battery.
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