The mobile phone is frozen and automatically shut down. The lithium battery product encounters a very cold test.

A cold spell last weekend, so that the people who are used to warm winter are suffering. It’s hard to endure the cold wind and go out, how can you not send a circle of friends? Many people were surprised to find that the phone did not play with a few times, the goods actually shut down. Is it difficult for adults to be afraid of cold phones? In fact, not only mobile phones, any electronic devices that use lithium batteries will encounter the same problem in the cold winter. The insider said that the lithium battery is actually something that is both cold and hot.

â—Ž phenomenon

The phone is frozen and automatically shuts down

Last week, Ms. Chen drove out and accidentally chased the front car. The rear-end car owner took out his mobile phone to take photos and took evidence. After taking a few shots, the phone automatically shut down. The owner is still very puzzled, because the mobile phone has a lot of power, but it can't be opened. Waiting for the 4S shop, the warm wind blows, the original strike mobile phone quickly returned to normal. The owner realized that the phone was frozen and shut down.

The reporter interviewed friends around me and found that in the coldest days of last week, if you use the mobile phone outdoors, it is very obvious that you can feel the power of the mobile phone is extremely fast.

Miss Li, who is in the grassland of the dam, told reporters that the winter temperature in her hometown is often below minus 20 degrees, and it is common for mobile phones to be shut down. "When I go back to my hometown in winter, the mobile phone will become very slow. Sometimes I call outside and the phone is turned off." But she did not forget to add, "We still call people outside in winter. It’s not that much, the phone has nothing to say, and the hands and ears can’t stand it.”

In fact, it is not just a mobile phone. A photojournalist also reports that the cold weather is shooting outside, and the camera is almost twice as fast as usual. He used a small mobile phone, but a professional-grade SLR camera -- the same level of camera used to shoot penguins in the Antarctic.

Electric car cruising range shrinks

The mobile phone is not resistant to freezing and can not be used back to the house. The abnormal performance of another high-tech product in the cold can make the user have a terrible headache. That is the electric car. When the cold weather hits, a lot of electric car owners will encounter a very difficult problem, that is, the cruising range of the vehicle will shrink a lot.

Inconvenient charging and limited battery life, it was originally the most important short board of electric vehicles, and when it encountered cold temperatures, this short board was enlarged a lot. Many of the regional taxis in the suburbs of Beijing are electric vehicles with new energy. A taxi driver who runs through Tongzhou told reporters that the electric vehicle he used was officially claimed to have a cruising range of 200 kilometers. However, under normal circumstances, it can run about 150 or 160 kilometers with a single charge. "It’s even worse when it’s cold in the past few days. If you turn on the air-conditioning heater, you can stick to 100 kilometers. It’s not bad.” If you don’t have a warm wind, you can’t stand it in the car, you can drive a warm air. It’s really hard to crash when you get old. "I can only wear more clothes. When I have no guests, I will turn off the warm air. Some people will open the car and open it as much as possible." The driver said helplessly.

The reporter checked some electric car forums and found that there were many complaints about the shrinking mileage of electric vehicles in winter. There have been professional automotive media who have used the battery life attenuation test in winter. The mileage of electric vehicles in winter will generally decrease significantly. The minimum mileage loss of vehicles of different brands is about 5%, and the most damage can be It is about 30%.

Moreover, this problem does not only occur in domestic electric vehicles that are cheaper. According to foreign media reports, the most powerful Tesla in electric vehicles, in the cold climate of the Nordic countries of Norway, has also been complained by many car owners that charging and battery life have encountered problems.

â—ŽExploring the lithium battery that is afraid of cold and hot

In fact, whether it is a mobile phone, a camera or an electric car, it is not the machine itself that really affects their performance in the cold, but the lithium battery that is used together by these products. It is precisely because of the "flawy chills" of lithium batteries that these electronic devices cannot be used normally at low temperatures.

It is understood that the working principle of the lithium ion battery is that the internal electrolyte changes through the chemical reaction, and a potential difference occurs between the positive and negative electrodes to generate a current. In a low temperature environment, the electrolyte moves relatively slowly, thereby affecting the transfer activity of lithium ions between the positive and negative electrodes, resulting in a decrease in battery charge and discharge performance. Simply put, in a low temperature environment, it is not that the lithium battery is really dead, but it has electricity but cannot be released normally. According to analysis data, the average lithium battery will have a 20% reduction in capacity at zero degrees Celsius. When it reaches minus 10 degrees Celsius, the capacity may be only about half.

According to Apple's official data, the iPhone's ideal temperature range is between 16 ° C and 22 ° C. The normal temperature range is 0 ° C to 35 ° C, and the temperature range is -20 ° C to 45 ° C. . The reporter checked the instructions of some other mobile phone products, and the temperature requirements are the same as those of the iPhone, including the camera, which are also required to be used between 0 ° C and 35 ° C. Below 0 ° C or above 35 ° C, there may be cases where it is not working properly.

From the feedback of netizens, it seems that the mobile phone is frozen and shut down more on the iPhone. Other mobile phones such as Android phones seem to be more "anti-freeze" than Apple. Some people with mobile hardware technology told reporters that the iPhone is more afraid of freezing and does not mean that the iPhone is not as good as other mobile phones. In fact, the iPhone will automatically shut down at low temperatures. It is not that the battery has reached an inoperable temperature, but to prevent damage to the phone battery and other hardware due to low temperature. The manufacturer sets the phone to perform when the temperature is below a certain value. Automatic shutdown protection, because the non-operating state of the lithium battery requires a higher temperature range than the working temperature. Most other phones don't have similar low-temperature protection settings, so they look so low-temperature and not as sensitive as the iPhone.

In addition, the technical staff of mobile phone companies also said that differences in body materials, industrial design, product performance, etc., will also cause different mobile phone products to have different performances at low temperatures, such as glass, metal and plastic materials. The fuselage, its own heat transfer capacity is not the same, the time when the mobile phone is exposed to the battery temperature reaches a critical value will be different; some mobile phone processors have poor heat dissipation, usually easy to heat, but in cold weather, they can persist Longer time.

â—ŽQuestion

Can the phone be more resistant to freezing?

Mobile phone companies can't spend more time thinking about making mobile phones more resistant to cold.

With such questions, the reporter consulted some mobile hardware engineers and came to the conclusion that the future mobile phone will definitely be more "anti-freeze".

From the aspect of mobile phone manufacturing, you can increase the cold protection function of mobile phones by using special materials and processes, but such mobile phones are difficult to really go to market. A professional said, "increasing the cold resistance of mobile phones, mobile phones may become thicker, heavier and more costly. This is inconsistent with the current trend of thin and light mobile phones. And antifreeze is a niche for mobile phones. Demand, for most people, mobile phones need to be antifreeze. It may only be a few days a year. How many people will spend more money to buy a more bulky mobile phone because of antifreeze?" Moreover, this method can not Fundamentally solving the problem of anti-freezing of mobile phones is nothing more than being able to stay longer in cold weather.

From a practical point of view, battery technology innovation is the best way to solve the cold resistance of electronic products such as mobile phones. It is reported that research institutes have developed battery technology that can be used normally in low temperature environments. "This is undoubtedly a direction of battery development. The battery that is normally used in low temperature environment will definitely be applied to mobile phones." A mobile phone hardware engineer said, "Of course, it takes a while for a new technology to go from the lab to the utility. of."

However, according to insiders of Huawei terminals, Huawei's new Mate8 uses a special formula in the battery materials used to prevent the battery's power and voltage from dropping rapidly at low temperatures. This also shows that mobile phone companies are indeed trying to innovate in battery technology. It is estimated that it is possible to adapt to more complex and harsh environments of mobile phones or electronic products. It is not far from entering our lives.

â—Ž Tips

It’s not advisable to put a mobile phone

A friend of the reporter went to the northeast for a business trip in the coldest days of last week. When other people’s mobile phones were in the cold, only her mobile phone used a special kind of equipment. Cold, no effect at all. What is "black technology" in the end? To put it bluntly, it is not rare -- she put a warm baby on the back of her phone.

But then again, although the way the warm baby "blessed" was confirmed to be effective, mobile phone technology people still said that this method is not recommended. Because the mobile phone is not only afraid of cold, but also afraid of heat. "Mobile phone batteries may explode when the outside temperature is too high; fine electronic components such as mobile phone motherboards, chips, displays, etc., may be damaged when the temperature is too high, even if there is no problem at that time, its service life may be Has been discounted. "According to the professional introduction, the temperature of the baby is not controllable, it is likely to exceed the upper limit of the phone can withstand.


Since the "self-heating" approach is not advisable, what are the reliable anti-freeze tips for electronic products? Professionals also gave the reporter a few tricks:

1. Try not to expose your phone to low temperatures. When we go out, we can put the phone close to the body, or put it in a bag with thermal insulation effect. If you need to make a call, you can use a Bluetooth headset or a wire-controlled headset. If there is no condition, try to shorten the time of each use.

2. For a mobile phone with a thicker and warmer mobile phone case, in theory, the more things wrapped around the phone, the slower the temperature is, and the longer it can be supported in cold weather.

3. If the phone is automatically turned off at low temperatures, do not turn on the phone immediately when you return to the room. This will cause damage to the components of the phone, and wait until the phone's temperature returns to normal.

4. For some electronic devices that are large and inconvenient to carry and keep warm, such as SLR cameras, camcorders, etc., the lithium battery can be taken out and kept in a warm place, keeping the temperature of the battery not too low, and then need to be used for removal and installation. .