The upper limit of the charging voltage of a single lithium iron phosphate battery is 3.65V.
Generally, the upper limit voltage of lithium iron phosphate battery charge is 3.7~4V, and the lower limit voltage of discharge is 2~2.5V. Considering the five aspects of discharge capacity, median discharge voltage, charging time, constant current capacity percentage, and safety, constant current and constant voltage are adopted. For lithium iron phosphate batteries, it is reasonable to set the charging limit voltage at 3.55～3.70V, the recommended value is 3.60～3.65V, and the lower limit voltage of discharge is 2.2V～2.5V.
Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as a positive electrode material. The cathode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate and so on. Among them, lithium cobalt oxide is currently the cathode material used in most lithium-ion batteries.
The charge cut-off voltage of lithium iron phosphate is 3.65V, but this voltage will vary depending on the material, generally the nominal is 3.65V
Lithium-ion batteries have high working voltage (three times that of nickel-cadmium batteries and nickel-hydrogen batteries), large specific energy (up to 165Wh/kg, which is three times that of nickel-hydrogen batteries), small size, light weight, long cycle life, and Many advantages such as low discharge rate, no memory effect, and no pollution. Among lithium-ion batteries, lithium iron phosphate batteries are more promising. Although this type of battery has less energy than lithium cobalt oxide batteries, it has high safety and a large single battery capacity. The PO bond in lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse and heat up like lithium cobalt oxide or form strong oxidizing substances, so it has good safety. A report pointed out that in actual operation, a small part of the samples were found to burn in acupuncture or short-circuit experiments, but no explosion occurred. In the overcharge experiment, high voltage charging that was several times higher than the self-discharge voltage was used, and it was found that there were still Explosion phenomenon. Nevertheless, its overcharge safety has been greatly improved compared with ordinary liquid electrolyte lithium cobalt oxide batteries.
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