Why do solar photovoltaic energy storage systems use lithium iron phosphate batteries and what are the advantages?
MANLY Battery Technical Support: With the rise of lithium batteries, solar photovoltaic energy storage systems increasingly favor the combination of lithium batteries. It is generally known that lithium batteries have a service life much longer than traditional lead-acid batteries, and they are small in size and easier to install and maintain. Lithium batteries have been widely used because of their high cost. Lithium batteries are divided into three elements, polymer lithium batteries, lithium iron phosphate batteries, etc. Why do solar photovoltaic energy storage systems use lithium iron phosphate batteries and what are the advantages?
Advantage
1. Improvement of safety performance
The P-O bond in the lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperatures or overcharges, it will not collapse and generate heat like lithium cobalt oxide or from strong oxidizing substances, so it has good safety. A report pointed out that in the actual operation of acupuncture or short circuit experiments, a small part of the samples were found to burn, 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 was still an Explosion phenomenon. Nevertheless, its overcharge safety has been greatly improved compared with ordinary liquid electrolyte lithium cobalt oxide batteries.
2. Improved lifespan
Lithium iron phosphate battery refers to a lithium-ion battery that uses lithium iron phosphate as a positive electrode material.
The cycle life of a long-life lead-acid battery is about 300 times, and the highest is 500 times, while the cycle life of a lithium iron phosphate power battery is more than 2000 times, and it can be used for 2000 times with a standard charge (5-hour rate). Lead-acid batteries of the same quality are "new half a year, half a year old, and half a year for maintenance", which can take up to 1 to 1.5 years. When used under the same conditions, lithium iron phosphate batteries have a theoretical life of 7 to 8 years. Comprehensive consideration, the performance-price ratio is theoretically more than 4 times that of lead-acid batteries. High-current discharge can quickly charge and discharge high-current 2C. With a dedicated charger, the battery can be fully charged within 40 minutes of 1.5C charging, and the starting current can reach 2C, but lead-acid batteries have no such performance.
3. Good high-temperature performance
The peak value of lithium iron phosphate electric heating can reach 350℃-500℃, while lithium manganate and lithium cobaltate are only around 200℃. Wide operating temperature range (-20C-75C), with high temperature resistance, lithium iron phosphate electric heating peak can reach 350 ℃-500 ℃, while lithium manganate and lithium cobalt oxide are only around 200 ℃.
4. Large capacity
∩The capacity of rechargeable batteries will quickly fall below the rated capacity when working under the condition that they are often fully charged and not discharged. This phenomenon is called the memory effect. Like nickel-metal hydride and nickel-cadmium batteries, there is memory, but lithium iron phosphate batteries do not have this phenomenon. No matter what state the battery is in, it can be adjusted to the best state at any time
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