When explaining the charging method of lithium batteries, the charging method of lithium iron phosphate batteries was involved. However, the previous related article only deals with a simple explanation of the charging method of lithium iron phosphate batteries, and in this article, the charging method of lithium iron phosphate batteries will be discussed in detail. If you have doubts or interests about what this article covers, you may wish to read on.
The full name of the lithium iron phosphate battery is lithium iron phosphate lithium ion battery. Because its performance is particularly suitable for power applications, the word "power" is added to the name, that is, lithium iron phosphate power battery. Some people also call it "lithium iron power battery", and the charging skills of lithium iron phosphate do you all understand? The following will introduce you to the charging techniques of lithium iron phosphate batteries.
1, before solving the problem, first of all we need to understand the structure and working principle of lithium iron phosphate battery LiFePO4 as the positive electrode of the battery, connected by aluminum foil and battery positive electrode, the middle is the polymer separator, which separates the positive and negative electrodes, but lithium ions can pass through and electrons cannot pass, and the right side is a battery negative electrode composed of carbon (graphite), which is connected by copper foil and the negative electrode of the battery. Between the upper and lower ends of the battery is the electrolyte of the battery, which is encapsulated by a metal casing. When charging a lithium iron phosphate battery, the lithium ions in the positive electrode migrate to the negative electrode through the polymer separator; During discharge, lithium ions in the negative electrode migrate to the positive electrode through the diaphragm. Lithium-ion batteries are named after lithium ions migrating back and forth during charge and discharge.
2. When the battery is charged, the lithium ions migrate from the surface of the lithium iron phosphate crystal to the surface of the crystal, and under the action of the electric field force, they enter the electrolyte, pass through the diaphragm, and then migrate to the surface of the graphite crystal through the electrolyte, and then embed in the graphite lattice. At the same time, the electron flows through the conductor to the positive electrode of the aluminum foil collector, through the polar ear, the battery pole, the outer circuit, the negative pole pole, the negative pole ear flows to the negative copper foil collector, and then through the conductor to the graphite anode, so that the charge of the negative electrode reaches equilibrium. After lithium ions are de-embedded from lithium iron phosphate, lithium iron phosphate is converted into iron phosphate.
3. When the battery is discharged, the lithium ions are de-embedded from the graphite crystal, enter the electrolyte, pass through the diaphragm, and then migrate to the surface of the lithium iron phosphate crystal through the electrolyte, and then re-embedded into the crystal lattice of lithium iron phosphate through the surface. At the same time, the battery flows through the conductive body to the copper foil collector of the negative electrode, through the polar ear, the battery negative pole, the outer circuit, the positive pole pole, the positive pole ear flows to the aluminum foil collector of the positive electrode of the battery, and then flows through the conductor to the positive electrode of lithium iron phosphate, so that the charge of the positive electrode is balanced.
Precautions: Once again remind lithium iron phosphate batteries to pay attention to waterproof and dustproof when using, so there can be no water in the storage place, which will affect the performance and service life of the battery.