How long is lithium-ion battery’s life?

People have death and death, lithium batteries have production and waste, lithium batteries are always unable to be used again and have to be scrapped *, people call this phenomenon lithium battery life. Since the day of birth, people have decided the limit of life, which can not be changed, but whether or not the daily habits of people can determine the length of extension within this limit; Lithium batteries have also had a upper limit of life since the moment they went offline. Similarly, whether or not lithium batteries are scientifically used and maintained determines the length of lithium batteries within their upper limit of life. This length, expressed in terms of the cycle of charge and discharge, is not consistent with the natural life of different types of lithium ion batteries(ie, the theoretical cycle of charge and discharge). For convenience, we use * commonly used mobile phone lithium batteries to explain this.

One commonly heard argument is that the life of a lithium battery is "500 times", and the "second" in the sense of the principle of a lithium battery refers to the cycle life, which is a completely charged and discharged cycle. The test method in the industry is: discharge depth × charge times = cyclic life, the numerical discharge depth is 80 %, and at least 625 charges are charged and discharged, IE 80 % × 625 = 500(times). Discharge depth refers to the percentage of the battery's rated capacity released during the battery's use. The reason why 80 % discharge depth is used is because the discharge depth is closely related to the charging life. The discharge depth is too large and the battery life will be shortened. In our daily use of the phone, when the phone reminds the battery that the battery is too low, it will start charging. Therefore, the cycle life of 500 times is the theoretical life of a lithium battery.

Since people can not fully pay attention to the problem of timely charging, the theoretical life of lithium batteries coming from a production line and tested by manufacturers under test conditions does not necessarily reach your battery. For your battery: actual charge times X discharge depth = actual battery life. After the concept of circular life is clear, we can distinguish it from what markers/consumers call "charging × × × times" and "charging × years".

The number of rechargeable times identified on the sale of electrical appliances or batteries is based on 80 % discharge depth. Therefore, when some people hear the saying "500 times", they think that they must put the power of the mobile phone out and charge it again. This idea is theoretically unscientific and it is wrong in practice. In doing so, the battery structure will be destroyed prematurely because of overloading or over-discharge. Instead, it shortens the service life of lithium batteries.

lithium cell

Another common phenomenon is that cell phone manufacturers usually make a promise to use the battery for several years and guarantee it for one year. This promise actually comes from battery manufacturers. As mentioned at the beginning of this article, lithium batteries can actually be used for how many years. It is closely related to the correct use of lithium batteries. In addition to the specified discharge depth(ie, anti-over-discharge) and anti-overcharging, there are also some factors that affect the service life of lithium batteries. Such as the size of the current and voltage, the cold and warm environment, idle power maintenance and so on. It should be pointed out that the natural life of lithium batteries is ultimately limited. The method we usually use to extend the life of lithium batteries actually refers to the correct use and maintenance of lithium batteries to release more lithium batteries. Can release energy.

The page contains the contents of the machine translation.