A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy.
I''m implementing a CC-CV algorithm for charging a li-ion battery. I''m confused what is the maximum allowed charging voltage during CC (constant current) phase. All application notes and datasheets, I''ve found state that charging in the CC mode continues until cell voltage reaches 4.2V per cell.
For lithium iron phosphate cells the nominal voltage is 3.6V and for ternary lithium & lithium manganate cells, it is 4.2V. Because of the use of graphite anodes, the voltage of lithium cells is dependent on the cathode materials .
For example, almost all lithium polymer batteries are 3.7V or 4.2V batteries. What this means is that the maximum voltage of the cell is 4.2v and that the "nominal" (average) voltage is 3.7V. As the battery is used, the voltage will drop lower and lower until the minimum which is around 3.0V.
For most modern Li-ion cells, 2.5 V is the discharge limit. Older batteries were usually rated at 2.75 V or 3.0 V, but as I''ve said, that''s not the case in 2020. However, to be completely sure, you do need to consult the
A lithium-ion battery''s nominal or standard voltage is nearly 3.60V per cell. Some battery manufacturers mark lithium-ion batteries as 3.70V per cell or higher.
The phosphate-based lithium-ion has a nominal cell voltage of 3.20V and 3.30V; lithium-titanate is 2.40V. This voltage difference makes these chemistries incompatible with regular Li-ion in terms of cell count and charging algorithm.
Li-ion batteries have a voltage and capacity rating. The nominal voltage rating for all lithium cells will be 3.6V, so you need higher voltage specification you have to combine two or more cells in series to attain it.
Lithium-ion batteries have a nominal voltage of 3.6V or 3.7V per cell. However, the working voltage of a lithium-ion battery can range from 2.5V to 4.2V per cell, depending on the chemistry and design of the battery.
What voltage should a lithium battery read? The nominal voltage of lithium-ion is around 3.60V/cell. A few cell manufacturers mark their lithium battery as 3.70V/cell or higher. Some lithium-ion batteries with LCO architecture have an increased nominal cell voltage and even permit higher charge voltages.