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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 was from Hangzhou's Urban Express, see http://news.sohu.com/2007020 (Why did I come here to be harmonious?) 9/n2481359 (Because I broke the bottom line of the proposer?) 78.shtml, please note that the picture for the frozen battery submission post is from this article. This article has been plagiarized 1600 times by netizens, causing me to put in a lot of effort to find the original version. I wonder if it is the minimum morality to indicate the original author when reprinting

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.

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