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Reasons and analysis for the expansion of lithium batteries and mobile phone batteries during use:

Under normal circumstances, batteries will not expand after prolonged use. The reason for battery expansion is due to prolonged charging time. It will not affect use, but the standby time will become shorter and shorter. The reason for battery heating and expansion is:

1. The power consumption of a mobile phone during standby is very low, which means that its battery has a high equivalent load resistance, so the discharge current is very small, so the battery will not generate heat, and the internal consumption of battery energy is very small

2. Mobile phones consume a lot of power while waiting for calls or games, which means that their battery has a low equivalent load resistance and is discharged with high current during operation. After discharging a portion of the battery, the internal resistance increases. However, the current required for the operation of the phone cannot

By reducing it, a considerable amount of energy is consumed on the internal resistance of the battery, causing it to heat up, accelerate discharge, and quickly shorten its usage time

The above is the reason why mobile phone batteries generate heat after prolonged use

The hazards of overheating in mobile phone batteries:

1. Prolonged heating of mobile phone batteries can cause internal components to overheat, leading to restarting or hanging up calls

2. Prolonged heating of mobile phone batteries can increase the heat of the battery itself. If the battery is sealed (such as NOKIA, which is not sealed, the battery is directly inserted), it will cause the internal air to expand violently, causing the battery to protrude like an external protrusion, and in severe cases, it can cause

Battery explosion

3. Prolonged heating of mobile phone batteries can accelerate the aging process of the phone itself and shorten its lifespan

The above is the harm of prolonged heating of mobile phone batteries to mobile phones

Prevention and solution of heat generation in mobile phone batteries:

1、 Preventive measures:

When the phone is at normal room temperature, it is normal for the heat to not exceed 60 ℃ and will not damage the battery

2. It is not advisable to use a high current charger for too long, as charging for too long can damage the battery and generate heat

3. It is best to use original or reputable products for chargers

If you are not in a hurry to use it, it is recommended to charge it in a slow charging mode to avoid causing the battery to heat up

5. If you feel the phone is a bit hot while listening to MP3 or charging the battery on your phone, you can use * # 0228 # to check its temperature. If it exceeds 60 ℃

If so, immediately return to standby mode or replace the battery. If charging, immediately unplug the charger

2、 Solution:

1. If the mobile phone battery has already been charged and bulged, there is also a solution. You can use your fingers to first find the gap in the battery (the back of the mobile phone battery is close to the charging electrode of the phone, and there is a soft area when pressed down), and use a needle to poke a small hole, so that

Just let the air inside run out

2. Buy an additional battery

We know that batteries are the source of mobile phone power, which is the power of the phone. Without battery power, the phone is like a piece of scrap metal. A high-capacity and high-performance battery can not only provide the phone with long battery life, but also protect hands

The circuit of the phone enables it to work efficiently for a long time, while conversely, it is highly likely to cause unexpected damage to the phone. For us players, the performance of the battery is already determined by its size and performance when it leaves the factory

The quality of energy is determined by the battery itself, and in this regard, we cannot artificially change it. However, this does not mean that after receiving the battery, we cannot do anything about it at all. Mobile phones use lithium-ion rechargeable batteries, which are used internally

When the stored battery is depleted, it needs to be recharged before replenishing the power. Don't underestimate the charging process. A good charger and correct charging method can maintain the battery's standby time for a long time and extend its service life

To put it simply, it can also provide protection for mobile phones. After a period of practical use and reference on how to charge, I have summarized the following points:

1. Generally, before leaving the factory, lithium batteries are activated and pre charged by the manufacturer, so the batteries have surplus power. For newly purchased mobile phone batteries that are lithium-ion, the first 3-5 charges are called adjustment periods, which should be charged for more than 14 hours to ensure full activation of lithium

Ionic activity. Lithium ion batteries do not have a memory effect, but they have strong durability and should be fully activated to ensure optimal performance for future use. Regarding the issue of first charging, original lithium batteries have already been tested before leaving the factory

With sufficient activation processing, there is no need to use long-term charging methods to activate the activity of lithium ions. For the first charging, simply use up the remaining electricity in the battery and fully charge it

2. Some automated intelligent fast chargers only indicate a full charge of 90% when the indicator light changes. The charger will automatically change and use slow charging to fully charge the battery. Do not cut off the power of the charger immediately, it is best to also give it a full charge

The battery needs to be charged for a period of time before use, otherwise it will shorten the usage time

3. Before charging, lithium batteries do not need to be discharged, nor can they be discharged. Currently, the chargers of lithium batteries produced do not have a discharge function. If the charging speed can be adjusted, it is recommended that everyone try to charge slowly to reduce fast charging

Method; The time for both slow and fast charging should not exceed 24 hours. Otherwise, the battery may burn out the battery cells due to the huge electron flow generated by long-term power supply

4. Many users keep their phones on while charging. During the charging process, the battery discharges outward due to the use of the phone and supplies power inward due to the charging of the battery, which may cause voltage imbalance and cause the circuit board of the phone to heat up

When there is an incoming call, it will generate an instantaneous backflow current, causing damage to the internal components of the phone

5. The lifespan of a battery depends on the number of repeated charges and discharges. Lithium batteries can be charged and discharged approximately 500 times continuously, and their performance will greatly weaken afterwards. It is advisable to avoid discharging all remaining battery energy before charging, otherwise as the number of charges increases

As it increases, the battery performance will gradually weaken, making it difficult for the battery's standby time to not decrease

6. Do not expose the battery to high temperatures or severe cold. During dog days, do not leave your phone in the sun or expose it to the scorching sun; Or take it to an air-conditioned room and place it in a place with direct air conditioning. When charging, the current product flows back, and the battery has a

It is normal to have a slight fever

7. If the mobile phone battery is left unused for too long, it is best to apply to the mobile phone repair department to activate the battery,

You can also use a DC voltage regulator yourself to adjust the voltage to 5-6V and the current to 500-600mA. Connect the battery in reverse. Note that it can be released with just one touch and repeated up to three times. After this process, use the original charger for "adjustment period" charging

8. Charging is not necessarily better for a longer period of time. When a battery without a protective circuit is fully charged, it should be stopped immediately, otherwise it may affect performance due to heating or overheating. The method for calculating the theoretical charging time of a battery is as follows: dividing the battery's charge by the charger's output

Current output is sufficient. For example, taking a battery with an 800MAH charge as an example, if the output current of the charger is 500MA, the charging time is equal to 800MAH/500MA=1.6 hours. Of course, this is only a theoretical calculation of the time to fully charge when the charger

After the charging is completed, it is best to give the battery about half an hour to recharge. Lithium ion batteries must use a dedicated charger, otherwise it may not reach the desired level

The saturation state affects its performance

At present, there are three main types of mobile phone batteries: nickel cadmium (Nicd) batteries; Nickel metal hydrogen (Nimb) batteries and lithium-ion batteries. Nickel cadmium batteries can carry large currents and are suitable for fast charging. The disadvantage is that batteries are prone to memory effects,

Known as an "environmentally friendly battery" by industry insiders, it is currently one of the high-quality, safe, reliable, and environmentally friendly mobile phone batteries. Lithium ion batteries have a high energy storage density, which can reduce the weight of mobile phones. The disadvantage is their high cost

To extend the usage time of mobile phone batteries, attention should be paid to the following aspects:

1. Fast Charging: Some automated intelligent fast chargers indicate a full charge of 90% when the indicator light changes. The charger will automatically change and use slow charging to fully charge the battery. It is best to fully charge the battery before use, otherwise it will shorten the usage time

2. Battery memory effect. Nickel cadmium batteries that are not fully charged or discharged for a long time are prone to leaving traces inside the battery, reducing its capacity. This phenomenon is called battery memory effect. Specifically, batteries seem to remember the user's daily charging and discharging amplitude

The mode is difficult to change over time and cannot be significantly charged or discharged

3. The basic charging method varies with the characteristics of the battery, so it should be charged according to the method specified in the manufacturer's manual. In standby standby mode, the phone also consumes the battery. If fast charging is required, the phone must be turned off or the battery removed before charging

Line charging

4. Regular elimination of memory batteries is necessary due to their memory effect. The method is to completely discharge the battery,

Then recharge. Discharge can be done using a discharge device or a charger with discharge function, or using the standby mode of the phone. If accelerating discharge, turn on the display screen and phone button lights to ensure that the battery can be fully charged, and follow the instructions

Use instructions to control time, repeat charging and discharging two to three times

★ The selection of power-saving mode GSM standard has an advanced feature, which is that most mobile phones have the "DTX" discontinuous transmission power-saving mode. In order to save power, when the phone owner does not transmit signals, the power of the transmitted radio waves is temporarily reduced by the phone. Experimental results have shown that,

DTX power-saving mode can extend call time by up to 30% to 50%. In quiet situations, switch to quieter and shorter phone ringtones, and choose to turn off the display screen or button lighting. In severe cold conditions, avoid battery temperatures that are too low, otherwise usage time will be shortened

The use of lithium-ion batteries should pay attention to three points:

1. How to charge a new battery

When using lithium batteries, it should be noted that after being left for a period of time, the battery enters a sleep state. At this time, the capacity is lower than the normal value, and the usage time is also shortened. However, lithium batteries are easily activated, as long as they undergo 3-5 normal charging and discharging cycles

It can activate the battery and restore normal capacity. Due to the characteristics of lithium batteries themselves, they have almost no memory effect. Therefore, users do not need special methods or equipment during the activation process of new lithium batteries. Not only in theory, but also from my perspective

From my own practice, it is best to use standard charging methods as a "natural activation" method from the beginning

There are many sayings about the "activation" issue of lithium batteries: the charging time must exceed 12 hours, repeated three times, in order to activate the battery. This statement that "the first three charges must be charged for more than 12 hours" is clearly derived from nickel batteries (such as

The term "nickel cadmium and nickel hydrogen" can be said to have been misinterpreted from the beginning. There is a significant difference in the charging and discharging characteristics between lithium batteries and nickel batteries, and it can be very clear to everyone that all the serious statements I have consulted

Formal technical documentation emphasizes that overcharging and over discharging can cause significant damage to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge according to standard time and methods, especially not to charge for more than 12 hours

In addition, lithium batteries or chargers will automatically stop charging after the battery is fully charged, and there is no "trickle" charging that nickel chargers refer to as lasting for more than 10 hours. That is to say, if your lithium battery is fully charged and placed on the charger, it will also be charged in vain

And none of us can guarantee that the characteristics of the charging and discharging protection circuit of the battery will never change and the quality will be foolproof, so your battery will be on the brink of danger for a long time. This is also another reason we oppose long-term charging

In addition, for some machines, if the charger is not removed after a certain period of time, the system will not only not stop charging, but also start a discharge charging cycle. Perhaps the manufacturer of this approach has its own purpose, but it is obviously beneficial for the battery

In terms of lifespan, it is unfavorable. At the same time, long-term charging requires a long time and often needs to be carried out at night. However, according to the situation of China's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very sensitive

Expensive, it has much lower resistance to fluctuations in charge and discharge compared to nickel batteries, which brings additional risks

In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over discharge, which is also detrimental to lithium batteries. This leads to the following issues

2. When should charging start during normal use

Because the number of charging and discharging cycles is limited, the lithium battery should be recharged with as much electricity as possible. However, I found an experimental table about the charging and discharging cycles of lithium-ion batteries, and the data on cycle life is listed as follows:

Cycle life (10% DOD):>1000 cycles

Cycle life (100% DOD):>200 cycles

Among them, DOD is the English abbreviation for discharge depth. As can be seen from the table, the number of rechargeable times is related to discharge depth. The cycle life at 10% DOD is much longer than that at 100% DOD. Of course, if converted to the actual total charging capacity: 10%

*1000=100100% * 200=200, the latter is still better for complete charging and discharging. Under normal circumstances, you should charge according to the principle of using up the remaining battery power before charging, but if your battery is not expected to charge on the second day

If you persist throughout the day, you should start charging in a timely manner. Of course, if you are willing to carry a charger to the office, that's another matter

And when you need to charge to cope with important events that are expected to cause busy communication, even when there is still a lot of remaining battery power, you just need to charge in advance because you have not truly lost "1" charging cycle life,

It's just "0. x" times, and often this x will be very small

The principle of using up the remaining battery power before recharging does not require you to go to extremes. Like long-term charging, there is a widely circulated saying that "try to use up the battery power of the machine as much as possible, and it is best to use automatic shutdown." This practice is actually just nickel charging

The practice on the pool is aimed at avoiding memory effects, but unfortunately it has also been circulating on lithium batteries today. There have been cases where someone continued to use automatic shutdown despite not charging due to a warning of low battery power in a machine

The machine in this example did not respond during subsequent charging and startup, and had to be sent to customer service for maintenance. This is actually due to the battery being excessively discharged, resulting in a low voltage that does not meet normal charging and startup conditions

3. Correct practices for lithium batteries

In summary, the most important reminder for the charging and discharging issues of lithium batteries during use is:

1. Charge according to standard time and procedure, even for the first three times;

2. When there is a low battery prompt, it is advisable to start charging as soon as possible;

3. The activation of lithium batteries does not require a special method. Lithium batteries will naturally activate during normal machine use. If you insist on using the widely circulated "first three 12 hour long charging activation" method, it will not actually be effective

Therefore, all practices that pursue 12 hour long charging and use lithium batteries for automatic shutdown are wrong. If you have followed the wrong statement before, please correct it in a timely manner, perhaps it is not too late

4. Pay attention to fire prevention when using lithium batteries

Many people may have only become familiar with lithium batteries from their mobile phones. In fact, they are used in many household appliances. Undoubtedly, the advantages of lithium batteries, such as high efficiency and lightweight, are rapidly promoting their application. However, did you know that using lithium batteries

Accidentally, it can also cause you to get angry

Lithium batteries have advantages such as lightweight, high efficiency, and low temperature resistance (-40 ℃). 0.3mm thick, stamp sized lithium batteries can be used continuously for more than 5 years. In recent years, the current alkaline dry batteries and manganese batteries are gradually being phased out, and are widely used in many high-end households

In electricity and mobile phones

Lithium batteries are different from the water-soluble electrolytes of zinc chloride and potassium hydroxide used in current manganese batteries and alkaline dry batteries. They use organic solvents. The positive electrode of lithium batteries is made of materials such as manganese dioxide, lead fluoride, and sulfur chloride. The negative electrode is made of lithium metal foil

Compared with zinc chloride, which is commonly used as the negative electrode of batteries, it has a stronger ionization tendency and a larger voltage difference between the positive and negative electrodes, which improves the working efficiency of lithium batteries. However, lithium batteries often generate heat and burn during use, which can have a mild impact on the use of the host

In severe cases, it can also burn down the host and cause fires. According to reports, Japan has experienced multiple household fire accidents caused by the heating and combustion of lithium batteries in recent years. So why do lithium batteries heat up and burn? Many materials in lithium batteries come into contact with water

Intense chemical reactions can occur and release a large amount of heat energy, leading to heating and combustion. Manganese dioxide in the positive electrode of lithium batteries can generate heat by only touching a small drop of water. After sulfur chloride in lithium batteries comes into contact with water, it generates hydrochloric acid and dioxygen

During the process of sulfur removal and the release of heat energy, several factors make lithium batteries a "spark" in daily life. Therefore, people must pay attention to waterproofing and moisture prevention when using lithium batteries. After various hosts are stopped, lithium batteries should be removed and stored in a dry and low-temperature place for proper storage

To prevent and avoid improper use of lithium batteries that may cause harm to households

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