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The Charging Principle and Charging Method of LiFePO4 Battery

Feb 08 , 2022

Ⅰ. The charge and discharge principle of the LiFePO4 battery


The charge-discharge reaction of the LiFePO4 battery is carried out between the two phases of LiFePO4 and FePO4. During the charging process, LiFePO4 is gradually separated from the lithium ions to form FePO4, and during the discharge process, the lithium ions are intercalated into FePO4 to form LiFePO4.


When the LiFePO4 battery is charged, lithium ions migrate from the lithium iron phosphate crystal to the crystal surface, enter the electrolyte under the application of electric field force, pass through the separator, migrate to the surface of the graphite crystal through the electrolyte, and then embed the graphite in character.


At the same time, the electrons flow to the aluminum foil collector of the positive electrode through the conductor, flow to the copper foil collector of the negative electrode of the battery through the tab, the positive pole of the battery, the external circuit, the negative pole and the negative pole, and then flow to the graphite negative pole through the conductor, so that the charge of the negative electrode reaches a balance. After the lithium ions are deintercalated from the lithium iron phosphate, the lithium iron phosphate is converted into a LiFePO4 battery.


Ⅱ. The charging methods of the LiFePO4 battery


Before charging, the LiFePO4 battery should not be specially discharged. Improper discharge will damage the battery. When charging, try to use slow charging and reduce fast charging, and the time should not exceed 24 hours.


Please use the original charger or a reputable brand charger. For LiFePO4 batteries, use a special charger for lithium ion batteries, and follow the instructions, otherwise the battery will be damaged or even dangerous.