What is the working principle of lithium battery discharge termination voltage?

The working principle of the lithium battery discharge termination voltage The lithium battery discharge termination voltage is an important application parameter related to the service life of the lithium battery. The current nominal voltage of a single lithium battery is generally designed to be 3.7V, and the termination voltage is 2.75V. There are two situations that cause the manufacturer to increase the upper limit of the termination voltage to 3.0V. The first is the electrochemical properties determined by the lithium battery material, which is often From the perspective of safer use of batteries; the second is related to specific electrical products and electrical environment. Of course, there are also the opposite situations. The termination voltage can be designed to be lower, such as 2.5V and 2.4V, but there is no lower than 2.4V. If the working temperature during discharging is in the range of -20~60℃, the lithium battery with a termination voltage of 2.75V can actually continue to discharge, but it must not be lower than 2.5V. As mentioned earlier, it is between 2.75V and 2.5V. The loss between time may be partial, and the most serious damage will be caused below 2.5V, making the battery unusable. Lithium battery packs also have a termination voltage. This type of lithium battery pack is sometimes called a core lithium battery. The discharge termination voltage of a core lithium battery should not be less than 2.75×n (n is the number of batteries in series). The most commonly used 6-cell lithium battery for notebook computers Take the battery as an example. This kind of 6-cell lithium battery often uses a combination of 3 strings and 2 parallels. Therefore, the discharge cut-off voltage of this kind of lithium battery is 2.75V×3u003d8.25V, and the minimum in practice cannot be lower than 2.5V×3u003d7.5 V. How to charge and discharge lithium batteries correctly? In the use of lithium batteries, it should be noted that the battery will enter a sleep state after being placed for a period of time. At this time, the capacity is lower than the normal value, and the use time is also shortened. It is best to charge the lithium battery according to the standard time and standard method, especially not to charge more than 12 hours. Generally, the charging method analyzed in the instruction manual is the standard charging method. At the same time, long-term charging takes a long time, often at night. According to the situation of my country's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and their ability to withstand fluctuations in charging and discharging is much worse than that of nickel batteries, so this brings additional dangers. There is no special method to activate the lithium battery, the lithium battery will be naturally activated during normal use. If you insist on using the circulated first three 12-hour long charge activation methods, it will actually not be effective. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the advantages of lithium iron phosphate battery as a rack-mounted UPS power supply?