429 views Yuda Electronic (HK) Technology Co.,Limited. 2018-05-22
1. The composition of a lithium phone battery
Lithium-ion phone batteries consist of a plastic case lid, a lithium battery cell, a protective circuit board (PCB) and a recoverable fuse (polyswitch). Some manufacturers also configure components such as NTC, identification resistors, vibration motors, or charging circuits.
The functions of each part are as follows:
(1) Lithium batteries cell: Provides rechargeable power.
(2) Protection circuit board (PCB): Prevents battery short circuit.
(3) Recoverable fuse (PTC): High-temperature protection, but also double protection after the protection circuit board fails.
(4) Recoverable fuse (NTC): Low temperature protection.
(5) Identification resistor: identify the original battery, non-original battery can not be used
the cell is very important, and the cell also has several levels, there are A-level cell, B-level cell
The cell phone uses a lithium polymer battery, so there is no memory effect and no activation is required. The first charge does not require charging for more than 12 hours like a nickel battery. It only takes about 4 hours to charge, and the lifetime of a lithium ion battery Only with the number of charge, lithium-ion battery can charge about 1000 times. Standby time is related to usage.
The battery is the source of mobile phone power. If there is no battery power supply, the mobile phone is a piece of scrap iron. A high-capacity and high-performance battery not only can give the mobile phone a long-term battery life, but also can protect the circuit of the mobile phone, making the mobile phone more efficient. On the contrary, it is very likely that the phone will be damaged. The performance of the battery is already determined at the factory. The size of the battery and the performance of the battery are determined by the battery itself. We cannot change it, but this does not mean that we can’t do anything about it after we get the battery. Lithium-ion rechargeable batteries are used in mobile phones.
A good phone charger and charging method can maintain a long standby time of the battery, and can also prolong the service life of the battery. Further, it can also protect the mobile phone. As for how to charge, we often ask in the forum. After a period of time, we actually use and refer to it. I summarize the following points:
In the use of lithium batteries, it should be noted that the battery enters hibernation after being left for a period of time. At this time, the capacity is lower than the normal value, and the use time is also shortened. However, the lithium battery is very easy to activate, as long as after 3-5 normal cycles can activate the battery and restore normal capacity. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect.
For the activation of lithium batteries, many arguments are: The charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement is obviously a continuation of nickel batteries (such as nickel-cadmium and nickel-hydrogen). So this statement is wrong. Lithium batteries and nickel batteries have very different characteristics. Over-charging and over-discharging can cause great harm to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge in accordance with the standard time and standard methods, in particular, do not charge more than 12 hours. In general, the charging method described in the cell phone manual is a standard charging method suitable for the cell phone.
In addition, a lithium cell phone or charger will automatically stop charging when the battery is full. And we can’t guarantee that the characteristics of the battery’s protection circuit will never change and the quality will be perfect, so your battery will be in danger for a long time. This is another reason why we oppose charging for too long.
On some mobile phones, if the charger is not removed after charging for more than a certain period of time, the system will not only stop charging but will also start a discharge-charge cycle. However, it is obviously disadvantageous for the battery and cell phone life. In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over-discharging. Overdischarge is also detrimental to lithium batteries. This leads to the following problem.
In the forum, this statement can often be seen, because the number of charge and discharge is limited, so the battery should be used as much as possible to recharge the electricity. But I found an experimental table about the charge-discharge cycle of lithium-ion batteries. The data on cycle life are listed below:
Cycle life (10%DOD):> 1000 times
Cycle life (100% DOD): > 200 times
3. Make your lithium-ion phone battery last longer – How to use lithium-ion phone battery correctly
A. Charge according to standard time and procedure, even if it is the first three times;
B. When prompting for low battery power, charging should start as soon as possible;
C. The activation of a lithium battery does not require a special method. The lithium battery is naturally activated during normal use of the mobile phone.
Therefore, all 12-hour long charging and the use of automatic shutdown of lithium battery handsets are all wrong. If you used to do it in the wrong way, please correct it in time. It may not be too late.
Of course, in the case of good protection and control circuits for mobile phones and chargers, the protection of lithium batteries is still quite guaranteed. For example, if you find that your phone must be charged before you go to bed at night, you can also start charging before going to bed. The key to the problem is that you should know what the correct approach is, and do not deliberately do it in the wrong way.
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