With the birth of lithium battery, its service life has always been a mystery. Many friends do not know how long the service life of lithium battery is. This article takes the lithium battery of mobile phone as an example to talk about it.

What is the lifespan of a lithium battery?

When it comes to the service life of lithium batteries, we have to mention the material, structure and application technology of lithium batteries, because different materials, different structures, and different application technologies will affect the life of lithium batteries. According to relevant tests The data proves that the theoretical service life of lithium batteries is about 300 to 500 times.

Many friends may say, how can the service life of this battery be calculated by "times"? Taking a mobile phone as an example, the "charge times" mentioned here does not refer to the number of times the mobile phone is charged, but refers to the "complete charge and discharge times". The mobile phone is charged from below 5% to 100%. Discharge from 100% to 5% again, and count the number of complete discharges once.

There is a difference between the number of tests and the actual number of charging

Any product needs to undergo rigorous testing, and the service life of lithium batteries is also the focus of the test. Many manufacturers need a long test process when launching a new lithium battery. Take the test data as an example, assuming the battery tested by the manufacturer The service life is between 300 and 500 times. If it is accurate to 400 times, the actual battery service life must be less than 400 times (completely charged and discharged). Manufacturers can decide the materials, design structures and application technologies used in the manufacture of batteries. However, it is impossible to determine the use environment of the battery, the constant changes of the external environment and the frequency of the user's use of the (mobile phone) device, etc., will affect the service life of the battery.

The number of battery life is gradually reduced, rather than directly scrapped

Still taking the lithium battery of the mobile phone as an example, as mentioned in the previous article, the theoretical charging times of the lithium battery is about 300~500 times. Assuming that the user charges once every two days, it will be charged about 180 times a year, but most mobile phones are charged. The battery life is more than three years, why the battery has not been scrapped?

It should be known that although the service life of the battery is limited, its service life is gradually reduced, not directly scrapped. Users report that after a mobile phone has been used for a period of time, the battery power is not durable. This is the reason, but in most cases, the battery storage capacity of many mobile phones will decrease, but even after the theoretical service life is reached, it can still be used in practice. However, the performance reduction ratio will exceed 20% and above.

Conclusion: The service life of lithium batteries has always been a mystery. Although many manufacturers have tested them, there are differences between theoretical life and actual application life, and there are many kinds of lithium batteries, such as lithium manganese batteries, lithium iron batteries, and lithium copper batteries. And so on, plus the lithium battery also has requirements on the working temperature, the temperature is too high or too low, etc., will affect the battery life.

Note: Although the lithium battery is mentioned in the text, it does not involve the hardware model, system version, and software version of any product.