What is the depth of discharge of Li-ion polymer batteries？
Since so lithium-ion batteries are charged there must be discharged, from a macroscopic point of view, lithium-ion battery safety operations discharge process is balanced, discharge must pay attention to the discharge rate and depth of discharge, the depth of discharge is the ratio of the amount of discharge and nominal capacity, there is value in the best reference overall target voltage. Lithium-ion battery depth of discharge is the ratio of the amount discharged and the total stored power (nominal capacity) of the lithium-ion battery. The lower the number, it means the shallower the discharge. Lithium-ion battery depth of discharge is closely related to voltage and current, and it can be said that it is mainly expressed in voltage and acts on operating current.
The depth of discharge of lithium-ion batteries is 80%, which means that they are discharged to the remaining 20% of capacity. The impact of discharge depth on the battery is: the deeper the depth of discharge, the easier it is to shorten the life of lithium-ion batteries; another aspect is the performance on the discharge curve, the deeper the discharge goes, the more unstable the voltage and current. In the same discharge regime, the lower the voltage value, it indicates that the deeper the depth of discharge. Smaller current discharge is more complete, the lower the working current, the longer the safe operating time, the less the amount of charge arriving at the same voltage. In a word, comment on any topic of lithium-ion battery discharge to consider the discharge regime, the key is the operating current.
Lithium-ion battery to any electrical equipment according to the amount of supply of operating current, the internal resistance value of the battery will also follow the capacity of the decline and increase, that when the depth of discharge is greater, the resistance value increases while the operating current is constant, the battery is required to supply more power and wasted in the form of heat.
Lithium-ion battery is originally a relatively smooth discharge curve in the depth of discharge will change sharply, so the depth of discharge is limited to a relatively flat range, so that customers can have a better control of the power, but also to get a better experience of use.
Polymer Li-ion battery discharge depth summary:
The deeper the depth of discharge of lithium-ion batteries, the greater the loss of batteries; lithium-ion batteries charged to the full, the greater the loss of batteries will also be. The best choice for lithium-ion batteries in the middle of the power state, so that the battery life is the longest.
Post time: Dec-28-2022