Lithium batteries are susceptible to temperature and how to use them properly

What's wrong with the iPhone auto-shutdown?

According to news reports in recent days, there are a large number of users of iPhone6 and iPhone6s series mobile phones that will automatically shut down when the battery is fully charged. This problem still exists after upgrading the system, and it will cause automatic shutdown when the temperature is low. According to the latest news, China Consumers Association has sent a letter of inquiry to Apple.

According to Apple's Apple Store staff, the internal hardware, operating system version and operating temperature of the phone may cause the iPhone to automatically shut down. In case of abnormal shutdown, you can contact the after-sales service.

In fact, the news that the iPhone was automatically shut down at low temperatures was spread a few years ago, and friends who are concerned about the news believe that it is also heard. According to the author's experience, my iPhone 6 has also encountered several automatic shutdowns, but they are all encountered at low outdoor temperatures, at least below 0 degrees.

Taking the temperature in Beijing as an example, the minimum nighttime is about 0 degrees. The author thinks that the possibility of shutting down due to temperature is low. The reason for the large-scale iPhone automatic shutdown is also difficult to guess, we are not going to catch up here. Of course, the focus of our discussion is not on mobile phones. Let's take a look at what happens to laptops at low temperatures and shut down.

What happens when the laptop is cold?

Maybe everyone will say that someone will use a laptop outdoors in the cold? Indeed, most of us use laptops outdoors without the high frequency and frequency of using a mobile phone, especially at low temperatures. So let's talk about what to pay attention to when using a laptop in a low temperature environment.

We continue to use Apple's new MacBookPro as an example. Its working temperature is 10-35 degrees Celsius. According to Apple's industrial design level, this level should represent the working temperature of most laptops. At the same time, we also noticed that its storage temperature is -25-45 degrees celsius, it is obvious that the storage temperature range is wider than the operating temperature.

As far as practical use is concerned, most of us use laptops, which are not as frequent as using mobile phones, and they do not use laptops for long periods of time outdoors, especially when the temperature is below 0 degrees Celsius. If you have to use your laptop in a cold environment, I don't think it will take long. If it is below 0 degrees Celsius for a long time, the following situations may occur:

1, the battery activity is greatly reduced, causing sudden shutdown or sudden drop in power, and can not be charged

At present, most of the batteries are affected by temperature, and the lower the temperature, the lower the electrochemical reactivity of the internal charge and discharge of the battery. According to experience, lithium batteries are not affected by temperature between 0-40 degrees Celsius, and once the temperature exceeds this range, life and capacity will be compromised. If the temperature is too low, there is a possibility that an unexpected situation such as a sudden drop in power or a sudden shutdown will occur.

2, computer hard disk with mechanical hard disk starts up slowly and takes long response time

The second one that can affect the big is the mechanical hard drive. If your computer is still using a mechanical hard drive, you should pay attention. Most mechanical hard drives operate at temperatures ranging from 5 to 60 degrees Celsius. Too low temperatures can result in reduced flexibility of internal mechanical parts, resulting in slower speeds.

3, static breakdown of internal parts

Winter in the north not only brings cold, but also low air humidity, which is more likely to generate static electricity. Stronger static electricity may cause breakdown damage to internal parts of notebooks. However, laptops at this stage have often done a good job of shielding static electricity, which has been very low.

However, at this stage, few people will use the laptop for a long time outside the outdoor temperature of 0 degrees Celsius. The above is only possible for your reference.

The field of expertise is really different.

Laptops or mobile phones that come into contact with everyday life are basically in consumer electronics. Is this also the case with laptops in the professional field?

The answer is no, I have tested a Dell's fully rugged notebook, which is a military-grade product. It is not only capable of having a hard outer shell, high-strength anti-drop, shock-proof It has IP65 dust-proof sand and waterproof ability, and its working temperature (-29~63 degrees Celsius) is also impossible for ordinary laptops. Computers of this size can cope with various complex environments, regardless of temperature, weather, etc., so it is prepared for firefighters, military, and special parts. This group of people often needs to use computer groups in multiple complex environments. It is also an advantage of a fully rugged model in the professional field.

Laptop battery good habits

I still remember playing a four-wheel drive when I was young. When the battery didn't run, I could heat it for a while. In fact, the impact of using the battery in the process of using electronic devices is quite obvious. Regardless of whether there are other reasons for the automatic shutdown of the iPhone, I finally recommend that you develop the habit of using the battery correctly.

1, maintain a good charge and discharge

In addition, most of the electronic devices we are in contact with lithium batteries , the capacity of lithium batteries will naturally decay, if the internal reaction of the battery produces precipitates will affect the capacity and life, so you should use the battery properly. Do not charge the laptop battery for a long time, and reasonably release the remaining battery power, at least once a month to ensure the power cycle. According to experience, let the battery capacity between 50% and 80% cycle to maintain a high life, and in daily use, if you run a higher load program, you can connect to the power supply, otherwise you can use the battery.

2, less than 20% charge, charge to 100% and then charge for half an hour

It is also recommended that the charge be less than 20%, because the battery is low and the voltage will be low. The long-term low voltage state will cause damage to the lithium battery. If you want to use it more durable, it will continue to charge for about half an hour after filling 100%. This practice is said to have a certain effect.

3, as for the temperature

We still have a very high possibility to use the mobile phone in an environment below 0 degrees. Therefore, I can only suggest that you try to avoid using the mobile phone in a low temperature outdoor. The electronic logic such as the iPhone is not only suddenly generated. The shutdown situation, and other electronic devices at low temperature and a lower frequency of use.

The page contains the contents of the machine translation.