Recognize the four paradoxes of lithium battery use

Aug 06, 2020   Pageview:657

A 7-year-old girl from Aitzhan in Kazakhstan was injured by Galaxy S2 in the pocket while playing in the yard. Of course, the lithium battery was fried. The hospital examination showed that the girl’s leg burned to the leg bones and even needed a skin transplant. - This is just one of a lot of battery explosion news. Lithium batteries are experiencing rapid growth in efficiency. Any cell phone with a battery can be considered a bomb. As a result, the existence of a mobile phone as a weapon is not only a simple brick. It is a good helper to kill people.


The battery weapon's job is of course still to power mobile devices. Originally, as time passed, its life was also a little decayed. Preventing the abnormal death and unpredictable self-explosion of battery weapons has become the focus of our research. After all, controlled weapons are good weapons.


Myth 1: Battery and charger are extremely explosive and dead?


Charge the phone battery with a charger that does not know the way, or simply use the cottage battery to achieve the explosion effect. Not only that, but charging with a charger that does not match the parameters can also achieve the same effect, the key is on the "output voltage" parameter marked on the charger.


The output voltage of the mobile phone tablet charger is mostly 5V. Usually, as long as this parameter is uniform, even if the numbers such as the output current are different, there is usually no problem in charging the battery.


If you want to be surprised by the explosion, you can use a charger with a larger output voltage to charge your phone. However, there are some exceptions, such as the iPad charger output voltage 5.1V, Apple officially claimed to charge the iPhone is no problem, perhaps this higher 0.1V is not a problem, and Apple charger has its own security solution. In addition, the internal charger of the cottage charger is not good at all. It is only a minute to let the battery explode, but you can try it immediately.


But to be honest, with the development of lithium battery technology and the layer-by-layer security features that manufacturers add to the battery, not only the power management chip has perfect control of the battery, but some batteries and mobile phones are in danger broken design. Non-cottage batteries and chargers have been difficult to explode, saying that charging when the phone can cause the phone to explode is a lie that the good thing is out of context.


Myth 2: Recharging without power can extend battery life?


Most of the small partners should have a slight memory for the lithium-ion battery that does not have the same memory effect as the previous nickel-metal hydride nickel-chromium battery. Therefore, the guidelines for the use of lithium batteries are: Fill it with nothing, don't wait until there is no electricity to recharge, and don't think about it all day long. Do not overcharge and discharge is the basic principle of use of lithium batteries.


Most of the older generation 70s and 80s left the truth to modern people: because with the accumulation of the charging cycle, the maximum battery power is the battery life is attenuating, so cherish the charging cycle, every time the battery is running out then charge the phone and fill it up at once, which will ensure maximum battery life. Even the mobile phone, tablet and notebook manuals say: the first time charging is "activated" battery the charging time needs to reach xx hours.


The life of the tumor in the nickel battery period is really tenacious, and it has harmed so many older revolutionaries and manuals. However, the battery cycle life is largely determined by the charge cycle—that is, the number of charge cycles increases and the battery life is lost. It’s just that they understand the meaning of the wrong “charge cycle”. For example, if the power consumption is from 90% to 40%, we will charge the battery to 90% - this is not a cycle, because only 50% of the electricity is charged and charged. Complete a charge cycle. Therefore, the charging of the lithium battery era should be arbitrary.


This means that charging is low and charging 100% each time is a sad argument. Lithium battery charging process is like this: Lithium ion is pulled out from the positive electrode and embedded in the negative layer structure. If it is overcharged, the lithium ion may be embedded too deeply, and it will not come out in the inside. This part of lithium ion cannot be used. The capacity is thus reduced; if it is excessively discharged, lithium ions are removed too much from the negative electrode, which may cause the negative layer structure to collapse, the electrode structure to be damaged, and the battery capacity to be reduced. (Lithium polymer batteries are common on the market today, and millet used to use this as a selling point. Book, but the main difference between lithium polymer batteries and ordinary lithium-ion batteries is in the electrolyte material. The charge and discharge process is still the migration of lithium ions between the positive and negative electrodes, so the essence of lithium polymer batteries is also lithium-ion batteries. .


It can be seen that it is a good habit to use lithium batteries without waiting for the battery to be recharged and not to be fully charged. Some manufacturers may recommend that users perform a complete charge and discharge at regular intervals. The purpose is to calibrate the accuracy of the battery display and to extend the battery life.


Myth 3: Can you extend battery life by installing software?


Battery management software is a magical thing. It seems that there are fast nouns, supplementary charging and trickle charging. So the high-end atmospheric grade noun display, but actually only through the API provided by the system to read the power display to the user, for charging Helping to stay in the background to help consume power, is definitely a model of the lithium battery era.


It must be said that the charging process shown by the battery management application does make sense, but the charging process is completely in the hands of the power management chip, and these "management applications" cannot be managed at all. The only thing worth noting is that some battery management software can actively reduce the processor frequency after the system root, or turn off some unnecessary processes and services in the background to save power.


Myth 4: Is it dangerous to charge your phone with a tablet charger?


There were rumors on Weibo that charging a mobile phone with a tablet charger was not feasible because a large output current could “break through the capacitor”. But there are still countless small partners who are not afraid of death, charging their phones with a tablet charger, because it seems that there is no big problem, and sometimes charging seems to be faster.


Here we are still the first to give guidelines. It is feasible to charge the mobile phone with a charger with a large output current. It usually does not bring any catastrophic consequences, and many times it can make the charging faster; but if you are classmates it is not a particularly important thing to go out and rush to charge a fast-powered mobile phone. Usually, you should not use this large-output current charger for a long time.


Usually, the charging efficiency of a mobile phone is determined by the charging voltage and the current. It is still more difficult to move the knife on the output voltage of the charger, so the general fast charging selects a larger maximum output current. For example, the flash charge of OPPOFind7 will increase the maximum output current of the charger to 4.5A, which is rare in the mobile phone tablet and even in the notebook industry. However, there is also a price to pay for the increase of the charging current. The Find7 is equipped with a special 7-pin charging port and 8 pin battery contacts, and there are multiple charging safety protections, which are necessary to increase the design and manufacturing cost of the charger and battery, so not everyone can use the 4.5A charger.


Here, the migration of lithium ions during charging can be compared to a road with an exit and an entrance. All cars must pass quickly, considering not only the width of the road, but also the bearing capacity and dispatching capacity of the inlet and outlet. A traffic accident has occurred. Increasing the charging current is like speeding up all cars.


Most mobile phone chargers typically have output currents ranging from 1A to 1.5A, while flat panel chargers have output currents of 2A or higher. This explains why sometimes the tablet charger charges the phone faster. So why not just let the phone charger be equipped with the maximum output current of 2A?


In fact, there are already mobile phones using 2A maximum output current chargers on the market, such as Huawei glory 6, which has not been released for a long time, so Huawei claims that the glory 6 charging speed is 30% faster than similar mobile phones. But if this charging road does not have such a good infrastructure, if the 2A maximum output current charger is used to charge the mobile phone battery with rated current 1A, if the power management chip does not limit the charging current, the charger will actually be 2A when the power is low. The current is charging the battery, after which the current is gradually reduced until it is full, so the charging speed is faster, but the heat of the battery will be more obvious - high temperature is the enemy of battery life. If it is charged for a long time, the life of the battery will be Will be affected by a relatively large impact.


There are also some mobile phone power management chips that limit the charging current. For example, the export of this road deliberately limits the traffic volume. Even if the entrance and the highway have higher traffic efficiency, they have to move to the exit. If the mobile phone limits the charging current to 1A, then there is no impact even if the 2A charger is used to charge the phone. Of course, it is not excluded that some manufacturers control the maximum output current of the charger in order to save cost, because the charging speed is also acceptable.


This principle also explains that using the computer USB interface to charge the phone more slowly, using the computer USB port or mobile phone charger to charge the tablet is almost incapable, because the computer USB2.0 port provides a maximum current of 500mA.


Conclusion: Public opinion is not credible and life is precious


Finally, it is worth mentioning that the influence of temperature on battery life is actually very large. The following table shows the effect of storage battery on battery life at different temperatures and different power levels. If you have a battery that you don't use for a long time, and you still hope that it will come in handy in the future, it will be placed in a non-full or non-powered state as described above, and refrigerating is the best way to store it.


According to the guidelines mentioned above, don't listen to rumors, cherish life, use your mobile device and battery at least to make the lithium battery die slowly, and even let the life of the lithium battery be longer than described in the manual. If you are eager to use a lithium battery as a burst weapon, it is a must-have for you to have a fake charger and data cable all the year round. Not only can you be innocent, but the next person on the news may be you.


The page contains the contents of the machine translation.


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