The working principle of lithium battery discharge termination voltage

The lithium battery discharging termination voltage is related to lithium battery cycle life, which is one of the most important application parameters. Therefore, we should first clarify the meaning of this concept:

1, the lithium battery at this moment is referring" Lithium ion batteries", because habits, daily life people often put the lithium ion battery colloquial for lithium-ion batteries, this is the place where differs from professional term application,

2, lithium battery discharging termination voltage refers to the lithium battery discharge after a certain voltage, unfavorable to discharge, otherwise it will cause some power lithium batteries are not reversible loss, serious damage to the battery.

Now the general design for single lithium battery nominal voltage of 3.7 V, termination voltage of 2.75 V, there are two kinds of circumstances make manufacturers to increase the termination voltage limit to 3.0 V, one is the electrochemical properties of lithium battery materials decided, it is often more security from the battery's point of view;2 it is associated with specific power products and power consumption environment., of course, also have the opposite, can put the termination voltage design are lower, such as 2.5 V and 2.4 V, but there is no lower than 2.4 V.

If discharge when working temperature is within the scope of the - 20 ~ 60 ℃, the termination voltage of 2.75 V lithium battery actually can also continue to discharge, but must not be lower than 2.5 V, as said earlier, between 2.75 V ~ 2.5 V losses may be a part of, and under 2.5 V can cause the most serious damage, make the battery doesn't work.

Lithium battery pack also has the termination voltage, the lithium-ion battery pack is sometimes referred to as "core" lithium-ion batteries, lithium battery "core" of the discharging termination voltage should be not less than 2.75 x n) (n series battery, lithium batteries, laptop computer in the most commonly used 6 core as an example, the 6 core lithium battery often use 2 and 3 string combination, therefore, the lithium battery discharge cut-off voltage of 2.75 V * 3 = 8.25 V, in the practical minimum not less than 2.5 V * 3 = 7.5 V.

In fact, due to the lithium ion battery are relatively expensive, therefore, both single lithium battery and multi-fiber lithium battery with protection board or protection IC, when the battery voltage reaches the end voltage, the battery can through electric appliance signal that a certain, operation method of user in mind.

The page contains the contents of the machine translation.