Lithium iron phosphate battery is actually a lithium ion battery with lithium iron phosphate as the positive electrode material. For lithium ion battery, the positive electrode material is divided into various kinds such as lithium cobaltate, lithium manganate, lithium nickelate, ternary material, iron phosphate. Lithium, etc., during which lithium iron phosphate is the most commonly used material in the lithium battery industry. The lithium iron phosphate battery is connected by the aluminum foil to the positive electrode of the battery, and the left side is the barrier of the polymer. It separates the positive electrode from the negative electrode, but the lithium ion Li can be started and the electron e- can not be used. The right side is the negative electrode of the battery composed of carbon. It is connected with the negative pole of the battery. The electrolyte is sealed between the upper and lower ends of the battery. The battery is sealed by a metal casing. When the LiFePO4 battery is charged, the lithium ion in the positive electrode is separated from the polymer to the negative electrode. During the discharge process, the negative electrode The lithium ion Li in the middle of the separation is moved to the positive electrode, and the lithium ion battery is named after the lithium ion is moved back and forth during charging and discharging. Lithium-ion battery operation principle, when the battery is charged, Li moves from the 010 surface of the lithium iron phosphate crystal to the crystal appearance, and under the effect of the electric field force, enters the electrolyte, passes through the barrier, and then moves to the appearance of the graphite crystal through the electrolyte. Then embedded in the graphite lattice, after lithium ions are deintercalated from lithium iron phosphate, lithium iron phosphate is converted into iron phosphate; when the battery is discharged, Li is deintercalated from the graphite crystal, enters the electrolyte, passes through the barrier, and then passes through the electrolyte. Moved to the appearance of the lithium iron phosphate crystal, and then re-inserted into the crystal lattice of lithium iron phosphate via the 010 surface, and then discharged to the lithium iron phosphate positive electrode through the electric conductor to start discharging. In order to align the conduction of the positive and negative electrodes of the lithium iron phosphate battery, it is necessary to participate in the positive and negative electrodes of the battery to make it constitute the activity of the battery, and how to end in the process of theoretical depiction and the theoretical production process. The above three equations also need to describe a series of experiments to verify, establish a mathematical model or establish a curriculum vitae formula, and then these models may be formulated for lithium-ion battery depiction.