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Long charging time and overcharging are not the same concept. Overcharging refers to the voltage being higher than the charging cutoff voltage during charging, with a typical lithium battery voltage of 4.2V. The voltage level determines whether the battery is overcharged, and has nothing to do with the amount of charging time. Generally, due to the charger or battery management chip in the phone, the maximum output voltage to the positive and negative terminals of the battery is 4.2V. Even if it exceeds the limit, there is still a built-in protection board for the lithium battery. This means that the voltage to the battery cell will never exceed 4.2V. No matter how long it is charged, it will not overcharge. The questioner can confidently charge the phone without damaging the battery. But be careful not to keep the charger plugged in for too long, such as two days a day. If it takes too long, firstly, the charger will also consume electricity, and secondly, the phone will cut off the power, causing the battery's energy to be used up. This may cause the battery to start charging again, then fully charged, and then reused in this cycle. Although the shallower the charging and discharging, the less impact it has on the lifespan of the lithium battery, it still has a negative impact on its lifespan.

The deeper the charging and discharging of lithium batteries, the greater the battery loss. The most ideal state for lithium batteries to work is shallow charging and discharging, which will result in a longer battery life. According to the engineer of Shibao Lithium Battery, the charging and discharging of lithium batteries is a redox reaction in chemistry, and in physics, it is the back and forth movement of lithium ions, so it is also known as a "swing type" battery. During charging, lithium ions are released and embedded in the negative electrode. If overcharging occurs, it causes the positive electrode structure to collapse, and the negative electrode precipitates and accumulates on the surface of the negative electrode due to the insertion of excessive lithium ions; During discharge, lithium ions detach from the negative electrode and return to the positive electrode. If excessive discharge occurs, it can cause copper ions in the negative electrode to precipitate and run to the surface of the negative electrode or even the positive electrode, affecting the structure of the positive and negative active substances and causing failure. Lithium battery charging is generally set up in two steps, divided into two processes: constant current charging process and constant voltage charging process. The constant current charging process accounts for most of the charging time, and constant voltage charging is a trickle charging process. During the charging process, attention should be paid to the occurrence of overcharging of lithium batteries. Regular lithium battery chargers will set the charging program according to the characteristics of lithium batteries, and lithium battery packs are equipped with protective boards to prevent overcharging of lithium batteries. 1、 Setting the upper limit of lithium battery charging according to requirements. Lithium battery charging current and charging voltage are the two most important parameters in lithium battery charging, which not only affect the charging performance of lithium batteries but also the safety of their use. High current or exceeding the upper limit of lithium battery charging can affect the performance of lithium batteries, or there may be dangerous situations such as fire and explosion. So when charging a lithium battery, attention should be paid to the charging voltage and charging current, and a lithium battery charger should be selected. If the charging voltage of a single lithium battery is 4.2V, then the charging voltage of multiple lithium batteries is 4.2V * the number of series connected lithium batteries. The minimum discharge voltage is 2.75V. In addition, it is important to pay attention to the discharge cut-off voltage of the lithium battery, which is the discharge termination voltage of the lithium battery. The ideal discharge cut-off voltage of the lithium battery is 3.0, but the setting of the discharge cut-off voltage of the lithium battery in actual use will be different, usually lower than 3.0V, in order to fully utilize the battery power. The most common way is to set the discharge termination voltage to 3.0V. When the battery is discharged to the termination voltage, it needs to be charged.

The main theme of the development of the battery industry in 2017 is that "ternary lithium batteries" have become the mainstream. "Improving quality and reducing costs" is the main theme of the industry's development in 2017. The market is rapidly gathering with leading enterprises, and the phenomenon of industry differentiation is intensifying. In the field of materials, the imbalance between upstream raw material supply and demand has led to further price increases, and the high nickel process of ternary materials has accelerated. The performance of lithium iron phosphate, separators, and electrolytes has steadily improved; In the field of equipment, the performance of enterprises has generally improved, while the risk of funding shortage caused by prolonged account periods is also expanding. Compared to 2016, there were two significant changes in China's lithium battery industry market in 2017: firstly, under the wave of investment expansion and mergers and acquisitions, competition among leading enterprises intensified; Secondly, the market application of ternary lithium batteries in the field of power batteries will greatly increase.

This year, the application of ternary lithium batteries in the field of power batteries has become mainstream. Large lithium iron phosphate battery companies such as CATL, BYD, and Guoxuan High tech have all begun to increase their production capacity of ternary lithium batteries. From the perspective of various types of batteries, in the total installed capacity of 18.1GWh lithium-ion batteries in the first 10 months of 2017, ternary/manganese batteries accounted for 55.03% of the total installed capacity with 9.96GWh, an increase from 54.49% in the first 9 months. Among them, lithium manganese oxide batteries account for less than 0.9GWh, while lithium iron phosphate batteries account for 43.51% with 7.88GWh, a decrease from 44.27% in the first nine months.

From the establishment of a dual point policy, to increasing the proportion of loan disbursements, and to the official use of dedicated license plates in multiple cities, the new energy vehicle industry has been continuously benefiting. Therefore, since the third quarter, China's electric vehicles have gradually increased in volume and rebounded, with a significant increase in sales and a continuous increase in demand for batteries. The total installed capacity of power batteries for vehicles in China in the first three quarters of this year was 14.75 GWh, a year-on-year increase of 24.14%, indicating that many battery companies have achieved significant revenue growth. At present, the most commonly used batteries for new energy vehicles are ternary batteries and lithium iron phosphate batteries. Affected by policies, the domestic price of lithium carbonate, as a lithium trading indicator, rose to 159000 yuan per ton in mid November, setting a new historical high.

1. Battery companies have a clear positioning in the segmented market of new energy vehicles, with a significant increase in the number of orders received by leading enterprises. This year, Wotma has signed orders totaling over 10.3 billion yuan, relying on high-energy lithium iron phosphate batteries and focusing on the passenger and special vehicle markets. Bike Battery has received orders from Hebei Yujie 18650 battery cells and Dongfeng Liuqi for 10 million 2000 sets of power battery packs, focusing on the passenger car market. Hengyuan New Energy, a small and medium-sized battery enterprise, has received a 1.5 billion yuan order from Zhejiang Geely, which has attracted industry attention. 2. The field of third-party power battery PACK has seen the emergence of a "unicorn". Plaid received a total of 4.6 billion yuan in orders from January to November 2017. Compared to other third-party PACK companies, Plaid has left many competitors behind. 3. The energy storage market is heating up this year, with orders received from companies such as Zhongtian Energy Storage, Nandu Power, and Shuangdeng Group. For example, Zhongtian Energy Storage signed a business contract with GCL Smart Energy for a 10MWh lithium-ion energy storage project.

There is a rumor recently that lithium batteries that are about to be scrapped can be put into the refrigerator for three days to freeze, and then taken out to revive and restore their use. Is it really that divine?

The batteries mentioned in this article starting from the next paragraph all refer to lithium batteries used in laptops, and may also make some sense for lithium batteries used in mobile phones (I am not very sure), but they are not commonly used nickel hydrogen batteries or other batteries in ordinary cameras. In fact, there is evidence to suggest that the deep charging and discharging method is indeed effective for nickel hydrogen batteries, and freezing is equivalent to a disguised deep charging and discharging of the battery, so it should also be effective (of course, few people will take the huge risk of battery explosion to save a few dry batteries). However, the aging of lithium batteries is generally caused by the disintegration of battery cell materials and is irreversible.

The time given by Guoke Network is too short for me to collect a discarded battery and personally conduct the experiment. And because I have more than 50% confidence in suspecting that doing so will cause permanent damage to the battery, I am really reluctant to take the battery and try it out, so I have to gather and organize information online.

First of all, I noticed that this incident was said to have been tested in the "Life Survey" program of Beijing Television Station, and the result was: useless! But now there is a proliferation of experts, and if the TV station finds an expert to randomly demonstrate and says it's useless, is it really useless? Why are there so many people circulating online?

I think it's better to find more people who say it's useful. Skipping those plagiarism, repost and nonsense without evidence, the earliest experimental article I can find on the domestic Internet was a post in 2005 entitled "Rebirth of Notebook Lithium Battery: Zombie Resurrection". (See also http://www.pxue.com/Html/311.html Yes, I know this is not the original post. The post clearly states that it was transferred from the specialized website (51nb. com), but for some reason, the original post from the specialized website has disappeared@ Xiaoyuan Tingfeng, your entry point coincides with mine by chance

It is worth noting that the author of the article clearly pointed out that this is the method he found to restore phone batteries on a mobile forum in Hong Kong. He used it for trial on a laptop battery. And after a preliminary search, I couldn't find any online articles about computer lithium battery freezing methods before the date of the article, so I strongly suspect that this article is the starting point of all laptop lithium battery freezing legends.

The other most important detail is not in the main text, but in the comments below. The responsible reposter also copied this important comment: after freezing treatment, a total of seven power supply experiments were conducted on the battery, and the first five battery power supplies were all for more than an hour, significantly higher than the level before freezing. From the sixth power supply, the battery fully recovered to its pre freezing state. So the recovery after freezing can only last for a short period of time.

If you search online carefully, you will find that there are many posts announcing the failure of the experiment (including many laymen who are going to refrigerate instead of freezing). And those posts that announce the success of the experiment and provide experimental data all have a common phenomenon, which is that after freezing, it only works well for a short period of time, and then it doesn't work anymore. Not only lithium batteries for laptops, but also for mobile phones. For example, in another article titled "Can an old mobile phone battery be repaired with a refrigerator?" in 2007 (the original text comes from the "Urban Express" in Hangzhou. Please note that the image attached to the frozen battery submission is from this article. This article was plagiarized 1600 times by netizens, and it took me a lot of effort to find the original version. I wonder if it is at least ethical to indicate the original author when reprinting it?)

In addition to the battery cells, there are other components in a laptop lithium battery, such as control circuits and chips, used to determine the charging status of the battery, such as protecting the battery from overcharging and bursting it, and preventing you from completely discharging the battery. This is because completely discharging all the electricity will cause permanent damage to the battery compartment. So the protection line will automatically cut off all communication with the outside world before the battery level drops below the warning line. The newly purchased lithium battery requires deep charging and discharging during the first few uses, in order to enable the protection system to calibrate parameters. (Of course, don't frequent deep charging and discharging in the future, as it will shorten your lifespan.)

As mentioned earlier, long-term freezing is actually a process of forced deep discharge, and it can be placed to the extent that even the protective circuits fail. I strongly suspect that freezing actually disrupts these parameters, allowing the battery to accumulate its final strength and work a few times in violation of safety regulations, at the cost of permanent damage inside the battery. Of course, your battery is already running low and you don't care about enduring greater pain.

I just posted a guess online yesterday, but someone questioned my guess. Okay, I'm not sure about the principle, it's entirely possible that it's wrong. I also searched online for the principles, and the results were even more confusing. Based on my years of studying science and reading science fiction, those explanations sound more like science fiction than science, so I won't paraphrase them.

But the unclear principle does not prevent us from summarizing the data and drawing conclusions. I know many impatient readers have the habit of skipping long paragraphs and directly looking at conclusions. So what is the result of this article, is the freezing method really effective? I think of four words for the effect of the freezing method: reflection.

In short, it has no practical value. On one hand, you spend one or two thousand yuan to buy a new one, and on the other hand, it's frozen for three days and can only be used five times after being taken out. You're not really that stingy, are you? Of course, I need to emphasize again at the end that this is about to revive the soon to be scrapped lithium batteries of laptops (and possibly mobile phones). What we are talking about is resurrection, not collection, nor other types of batteries. If it is a nickel hydrogen battery or nickel cadmium battery, due to different principles, it may work in some cases. I'm not talking about the button battery on your watch either. Well, there's not enough data to determine.

At present, there are two types of lithium batteries for mobile phones, lithium-ion and lithium polymer. Both types of battery positive electrode materials are the same, generally

Both are lithium cobalt oxide (ternary materials and lithium iron phosphate currently do not have physical products in mobile phone battery products), the main difference is that

The electrolyte of lithium-ion batteries is lithium hexafluorophosphate, while the electrolyte of lithium polymer batteries is a solid polymer. Polymer battery basics

Above all, it specifically refers to Sony Ericsson's batteries. Generally speaking, polymer batteries have more uniform discharge and better safety performance, but their cost is lower than

Higher.

The charging precautions for both types of lithium batteries are basically the same. So let me emphasize the safety characteristics of lithium batteries. Due to the lack of overcharging protection for lithium batteries, which means that charging can easily cause explosions, all battery manufacturers will install a circuit control chip inside the lithium battery, which will automatically shut off power immediately after overcharging. The safe temperature of lithium batteries is around 180 degrees, and exceeding this temperature is extremely prone to explosions.

So how do I charge the battery properly for a newly purchased phone? Because any lithium battery must undergo safety testing before leaving the factory, the process is equivalent to activation, ensuring that lithium ions in the positive electrode material can freely enter and exit without lattice collapse. So the batteries in the hands of ordinary consumers are strictly tested and activated, so there is no need to worry about the activation status.

The origin of the statement circulating online that the first three times you charge for 12 hours is that the earliest mobile phone batteries were nickel hydrogen batteries, such as the Nokia 3310. Nickel hydrogen batteries do not need to be activated when they leave the factory, and the batteries themselves have a memory effect. Therefore, in order to make the battery

To achieve optimal performance, users often need to first charge to the full capacity and then fully discharge the battery (voltage changed from 1.2v to 1.0v), which can prevent memory effects. If the starting charging time is too short, the battery is not fully excited

A 1000mAh battery may only charge up to 900mAh, which has a significant impact on both battery efficiency and battery life itself.

What will happen when using the same method on lithium batteries? Because the crystal properties of lithium cobalt oxide are different from nickel hydroxide, it is more prone to lattice collapse than nickel hydroxide. So during the charging process, if the overcharging time is too long,

It is easy to render the space activity of lithium cobalt oxide ineffective, and charging will inevitably lead to an increase in temperature. This has a significant impact on the positive electrode material and may also cause danger. Because of this, we must never fully charge the battery when using lithium batteries, as lithium cobalt oxide will seriously fail and its lifespan will be shortened. The correct method is not to wait until the battery is almost depleted before charging, and immediately unplug the power after the battery indicates that charging is complete.

The most appropriate charging method for a mobile phone is to charge it offline when it is turned off, unplug the power immediately when it is fully charged, and then turn it back on for use.

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