What is the difference between the charging method of lithium iron phosphate and lead-acid batteries? Lithium iron phosphate batteries and lead-acid batteries in addition to the difference in charging methods, the two have a fundamental difference in the composition of the material, a lithium battery, a lead-acid battery.
Introduction of lithium iron phosphate batteries
Lithium iron phosphate battery, refers to the lithium-ion battery with lithium iron phosphate as the cathode material. Lithium-ion battery cathode materials are mainly lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc.
Working principle
The left side of lithium iron phosphate battery is the olivine structure of LiFePO4 as the positive electrode of the battery, connected by aluminum foil and the positive electrode of the battery, the middle is the polymer diaphragm, which separates the positive electrode from the negative electrode, but the lithium ion Li+ can pass while the electron e- can not pass, the right side of the battery is composed of carbon (graphite) negative electrode of the battery, 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 hermetically sealed by a metal casing.
Introduction of lead-acid battery
Lead-acid battery is a kind of battery whose electrode is mainly made of lead and its oxide, and whose electrolyte is sulfuric acid solution. In the discharged state, the main component of the positive electrode is lead dioxide and the negative electrode is lead; in the charged state, the main component of both positive and negative electrodes is lead sulfate.
The nominal voltage of a single-cell lead-acid battery is 2.0V, which can be discharged to 1.5V and charged to 2.4V; in application, six single-cell lead-acid batteries are often connected in series to form a nominal 12V lead-acid battery, as well as 24V, 36V, 48V, etc.
Working Principle
Lead-acid battery
After the lead-acid battery is charged, the positive plate is lead dioxide (PbO2). Under the action of water molecules in sulfuric acid solution, a small amount of lead dioxide is born with water as dissociable unstable substance - lead hydroxide (Pb(OH)4), hydroxide ions in solution, lead ions (Pb) stay on the positive plate, so there is a lack of electrons on the positive plate.
After charging the lead-acid battery, the negative plate is lead (Pb), which reacts with sulfuric acid (H2SO4) in the electrolyte and becomes lead ion (Pb2), and the lead ion is transferred to the electrolyte, leaving two more electrons (2e) on the negative plate.
The difference of charging method
Lithium iron phosphate battery
Some battery chargers themselves are protected, when the detection of lithium iron phosphate battery voltage reached 4.2 volts, it stops charging. In the lithium iron phosphate battery and the charger in series with a slightly larger power silicon diode (forward voltage drop of about 0.6 volts) so that when charging, when the lithium iron phosphate battery voltage reaches 3.6 volts, plus the diode voltage drop is exactly 4.2 volts, the same can be detected by the charger to stop charging.
Lead-acid batteries
General lead-acid battery charging charger, are using a three-stage charging mode, in the case of 100% used up electricity, charging time will be in the 8-10 hours, do not exceed 12 hours, so that the battery life will have an impact, it is best not to use every time you use up the electricity, it is recommended that the power in about 70% to charge the lead-acid battery, charging time is generally in about 6-8 hours.
Lithium iron phosphate and lead-acid batteries in the charging, the best choice of charger is the original battery charger, which will be more closely matched to the battery charging circuit, more secure.
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