5-Step Lithium Iron Phosphate Charging Algorithm

Lithium iron phosphate is a form of lithium-ion battery, since the energy is hold on within the same means, moving and storing  lithium ions rather than lithium metal. These cells and batteries not only have high capability, however will deliver high power. High-power lithium  phosphate batteries area unit currently a reality. they will be used as storage cells or power sources. 

Conventional charging

During the conventional lithium ion particle charging method, a standard lithium iron phosphate need two steps to be absolutely charged: step 1 uses constant current to succeed in concerning hr State of Charge (SOC); step 2 takes place once charge voltage reaches 3.65V per cell, that is that the higher limit of effective charging voltage. Turning from constant current to constant voltage implies that the charge current is restricted by what the battery can settle for at that voltage, therefore the charging current tapers down asymptotically, even as a electrical device charged through a resistance can reach the ultimate voltage asymptotically.

Overcharging Lithium-ion

Lithium-ion operates safely inside the selected in operation voltages; but, the battery becomes unstable if unwittingly charged to a better than nominative voltage. Prolonged charging on top of 4.30V on a Li-ion designed for 4.20V/cell can plate bimetallic Lithium-ion on the anode. The cathode material becomes associate oxidiser, loses stability and produces dioxide (CO2). The cell pressure rises and if the charge is allowed to continue, this interrupt device answerable for cell safety disconnects at 1,000–1,380kPa (145–200psi). ought to the pressure rise more, the protection membrane on some Li-ion bursts open at concerning 3,450kPa (500psi) and also the cell might eventually vent with flame.

Simplified battery management system and battery charger

Large overcharge tolerance and self-balance characteristic of LiFePO4 battery will modify the battery protection and balance circuit boards, lowering their value. The one step charging method permits the utilization of a less complicated typical power provider to charge LiFePO4 battery rather than exploitation a chic skilled Li-ion battery device.

Self balance 

Unlike the lead-acid battery, variety of LiFePO4 cells in an exceedingly battery pack serial affiliation cannot balance one another throughout charging method. this can be as a result of the charge current stops flowing once the cell is full. this can be why the LiFEPO4 packs would like management boards.

High temperature performance 

It is detrimental to have a Lithium iron phosphate battery working at elevated temperature, such as 60°C. However, a LiCoO2 runs better at elevated temperature, offering 10% more capability, due to higher lithium ionic conductivity. It is damaging to possess a LiCoO2 battery functioning at elevated temperature, like 60°C. However, a LiFePO4 battery runs higher at elevated temperature, providing 10 % additional capability, thanks to higher atomic number 3 ionic conduction.

 

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