The correct charging method for lithium battery

The life of electricity is generally 300-500 charging cycles. It is assumed that the electric quantity provided by a complete discharge is 1Q. If the reduction of electric quantity after each charging cycle is not taken into account, the lithium battery can provide or supplement 300q-500q electricity in total within its service life. So we know that if you charge it 1/2 at a time, you can charge it for 600 to 1000 times; If you fill it 1/3 at a time, you can fill it 900-1500 times. By the same token, if you charge it at random, you don't know how many times it would have. But anyway, no matter how many times you charge it, you're going to get 300 to 500 watts of electricity constant. So, we can also understand: lithium battery life is related to the total charge of the battery, and has nothing to do with the number of charges. The effect of deep discharge and shallow discharge on the life of lithium battery is similar. So, some manufacturers advertise, "so-and-so powerful lithium battery can charge more than 1500 times. This is purely bullying consumers' ignorance.

In fact, shallow discharge and shallow charge are more beneficial to lithium battery. Only when the power module of the product is calibrated for lithium battery can deep discharge and deep charge be necessary. Therefore, the use of lithium electric power supply products do not have to adhere to the process, everything in order to facilitate, at any time charging, do not have to worry about the impact of life.

Note three points for the use of lithium ion batteries:

How to charge a new battery

In the use of lithium battery should be noted that the battery after a period of time will enter the dormant state, at this time the capacity is lower than the normal value, the use time will also be shortened. But lithium battery is very 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, users do not need special methods and equipment in the activation process of new lithium batteries. Not only in theory, but in my own practice, the "natural activation" approach of standard charging from the beginning is the best.

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 "first three charges to charge more than 12 hours" is obviously a continuation of the nickel battery (such as nickel cadmium and nickel hydrogen) claims. 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 emphasize that overcharge and over discharge will cause great harm to lithium battery, especially liquid lithium ion battery. Therefore, it is best to charge according to standard time and standard method, especially do not charge more than 12 hours.

In addition, lithium batteries or chargers automatically stop charging when the battery is fully charged, and there is no so-called "trickle" of nickel chargers that last 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 around the edge. This is another reason we oppose long - term charging.

In addition, on some machines, 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. This may serve a purpose, but it is clearly bad for battery 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 relatively 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. This leads to the following question.

2. When should I start charging in normal use

Since the number of charges and discharges is limited, lithium batteries should be used up and recharged as much as possible. However, I found an experimental table about the charge and discharge cycle of lithium ion battery, and the data about the cycle life are listed as follows:

Cycle life (10%DOD):>1000

Cycle life (100%DOD):>200

DOD stands for discharge depth. As can be seen from the table, charging times are related to discharge depth, and the cycle life of 10%DOD is much longer than that of 100%DOD. , of course, if the conversion to the actual charge relative to the total capacity: * 1000 * 200 = 200 = 100100%, 10% of the latter to fully charge and discharge is still relatively good, but in front of the net friend of the idea to do some correction: under normal circumstances, you should have a reservation, according to the principle of battery remaining power run out to refill charging, but if your batteries in your expected to 2 days can't insist on the whole during the day, it should start charging in a timely manner, of course, if you are willing to carry the charger to the office when BieLun again.

And when you need to recharge in anticipation of an important event that will result in busy communications, even if the battery has a lot of power left, you just charge it in advance, because you're not really losing "1" charge cycle life, which is "0.x" times, and often that "x" is small.

The principle of recharging after a battery has run out of juice is not to take you to extremes. As widespread as long charging is, "try to use up your machine's battery, preferably by shutting it down automatically." This is really just a nickel battery, designed to avoid memory effects, but unfortunately it also works on lithium batteries. There have been examples of people who continue to use a machine without charging after warnings that the battery is too low. As a result, the machine in this example did not respond in the later charging and starting up, and had to be sent to customer service for maintenance. In fact, this is because the battery voltage is too low due to excessive discharge, so that it does not have the normal conditions for charging and starting up.

3, the correct approach to lithium battery

To sum up, the most important tips for charging and discharging problems of lithium batteries in use are as follows:

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

2, when the machine power is too low, should try to timely start charging;

3. No special method is required for the activation of lithium battery, which will be activated naturally in normal use of the machine. If you insist on using the popular "first three 12-hour long charging and activating" method, it won't actually work.

So all the attempts to charge for 12 hours and turn off the lithium batteries automatically are wrong. If you have done something wrong before, please correct it before it is too late.

4, use lithium battery pay attention to fire prevention

Many people may be familiar with lithium batteries from mobile phones. In fact, it is used in many home appliances. There is no doubt that the advantages of lithium batteries, such as high efficiency and light weight, are rapidly spreading their application. But did you know that even careless use of it can get you in hot water?

Lithium battery has a light weight, high efficiency, the advantages of resistance to low temperature 40 ℃ (-), 0. 3mm thick, stamp size lithium battery can be used for more than 5 years, in recent years is gradually phased out the alkaline dry battery and manganese battery, widely used in many high-end home appliances and mobile phones.

Unlike the water-soluble electrolytes of zinc chloride and potassium hydroxide in existing manganese and alkaline dry batteries, lithium batteries use organic solvents. The positive electrode of lithium battery is made of manganese dioxide, lead fluoride and sulfurous chloride. The lithium metal foil used in the negative electrode is compared with the zinc chloride used in the negative electrode of the general battery.

However, lithium batteries in the use of the process often appear in the heat, combustion phenomenon, light affect the use of the host, the heavy will also burn down the host cause a fire. It is reported that in recent years, there have been a number of incidents of domestic fires caused by the hot burning of lithium batteries in Japan.

So why do lithium batteries get hot and burn? The original lithium battery in many materials and water contact can occur to violent chemical reaction and release a lot of heat resulting in heating, combustion phenomenon. The manganese dioxide of lithium battery positive pole, dip in a small drop of water to be able to appear febrile phenomenon only. After the chlorinated sulfite in the lithium battery contacts with the water, in the generation of hydrochloric acid and sulfur dioxide at the same time to release heat energy, several factors make the lithium battery become the "fire" in the life, so people must pay attention to the use of lithium battery waterproof, moisture-proof. After all kinds of hosts are out of service, the lithium battery should be taken off and placed in dry and low temperature for safekeeping, in order to prevent and avoid the family fire accident caused by improper use of lithium battery.

If it is in low temperature environment, namely 4 ° C below used in Lithium battery, also found that the battery's used time is reduced, some mobile phone original lithium electricity would not have electricity even in low temperature environment. But don't worry too much about that , this is just a temporary situation, unlike the use of high temperature environment, once the temperature rises, the molecules in the battery will heat, and it will immediately restored to the previous power.

The page contains the contents of the machine translation.