The working principle of lithium battery discharge, what is the cut-off voltage? The termination voltage of lithium battery discharge means that after the lithium battery is discharged to a certain voltage, it should not be continued to discharge, otherwise it will cause irreversible loss of some of the lithium battery ’s power and serious damage to the battery. The nominal voltage of a single lithium battery is generally 3.7V, and the termination voltage is 2.75V.
Working principle of lithium battery discharge termination voltage
The termination voltage of lithium battery discharge is an important application parameter related to the service life of lithium batteries. At present, the nominal voltage of a single lithium battery is generally designed to be 3.7V and the termination voltage is 2.75V. There are two cases that allow manufacturers to increase the upper limit of the termination voltage to 3.0V. One is the electrochemical properties determined by the lithium battery material. From the perspective of using batteries more safely; the second is related to specific power products and power environment. Of course, there are opposite situations. You can design the termination voltage to be lower, such as 2.5V and 2.4V, but not lower than 2.4V.
If the operating temperature during discharge is in the range of -20 ~ 60 ° C, a lithium battery with a termination voltage of 2.75V can continue to discharge, but it must not be lower than 2.5V. The loss may be partial, and below 2.5V will cause the most serious damage, making the battery unusable.
A lithium battery pack also has a termination voltage. This type of lithium battery pack is sometimes called a cell lithium battery. The discharge termination voltage of a cell 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 for laptop computers As an example, this 6-cell lithium battery often uses a combination of 3 series and 2 parallel. Therefore, the cut-off voltage of this lithium battery is 2.75V × 3 = 8.25V, and the minimum cannot be lower than 2.5V × 3 = 7.5V in practical use.
How to charge and discharge lithium batteries correctly?
It should be noted in the use of lithium batteries that the battery enters the hibernation state after being left 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 lithium batteries according to standard time and standard methods, especially not to charge for longer than 12 hours. Generally, the charging method described in the instruction manual is the standard charging method.
1. Charge according to the standard time and procedure, even for the first three times;
2. When the battery is too low, you should try to start charging in time;
3. Try not to use fast charging;
4. Try to use original high-quality chargers;
5, lithium battery activation does not require a special method, in normal use lithium battery will naturally activate. If you insist on activating the method with the first three 12-hour long charging cycles, it will not actually work.
Therefore, all the pursuit of 12 ~ 16 hours of long charging and the use of lithium batteries for automatic shutdown are wrong. If you did it in the wrong way before, please correct it in time, maybe it is not too late.
