The 12v lithium battery discharge termination voltage is an important application parameter related to the service life of the lithium battery. Therefore, users should know what is the 12v lithium battery termination voltage, and what does it specifically refer to?
The 12v lithium battery discharge termination voltage means that after the lithium battery pack is discharged to a certain voltage, it should not continue to discharge, otherwise it will cause irreversible loss of part of the lithium battery's power, and the battery will be completely damaged in serious cases.
The current nominal voltage of a single polymer lithium battery is generally designed to be 3.7V, and the termination voltage is 2.75V. The nominal voltage of a single lithium iron phosphate battery is 3.2v, and the termination voltage is 2v.
If the working temperature during discharging is in the range of -20~60℃, the polymer 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 above, at 2.75V~2.5 The loss between V may be partial, and the most serious damage will be caused below 2.5V, making the battery unusable.
The 12v lithium battery pack also has a termination voltage. The discharge termination voltage of three polymer 12v lithium batteries should not be less than 2.75×3=8.25 (3 is the number of batteries in series). Therefore, the 12v lithium battery discharge cut-off voltage is 8.25V, which is the lowest in practical use. Lower than 2.5V×3=7.5V.
Because the iron phosphate 12v lithium battery pack adopts four series connection, that is, the single lowest discharge voltage×the number of series=termination voltage, which is 2×4=8v.
In fact, because 12v lithium batteries are relatively expensive, 12v lithium batteries are equipped with protection ICs or protection boards. When the voltage of the battery pack reaches the termination voltage, the battery pack will send a certain signal through the electrical appliance or automatically shut down. The user should keep in mind the operation method.
