At present, the usual batteries in photovoltaic energy storage systems are electrochemical energy storage, which uses chemical elements as energy storage media, and the charge and discharge process is accompanied by chemical reactions or changes in the energy storage media. Mainly include lead-acid batteries, flow batteries, sodium-sulfur batteries, lithium-ion batteries, etc. The current applications are mainly lithium ion batteries and lead acid batteries.
Lead-acid batteries
Lead-acid battery (VRLA) is a storage battery whose electrodes are mainly made of lead and its oxides, and the electrolyte is sulfuric acid solution. In the discharge state of a lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the charged state, the main component of the positive and negative electrodes are lead sulfate. Used in photovoltaic energy storage systems, there are more three types, flooded lead-acid batteries (FLA, flooded lead-acid), VRLA (Valve-Regulated Lead Acid Battery), including AGM sealed lead There are two types of storage batteries and GEL gel-sealed lead storage batteries. Lead-carbon batteries are a type of capacitive lead-acid battery. It is a technology evolved from traditional lead-acid batteries. It adds activated carbon to the negative electrode of the lead-acid battery. The improvement is not much, but it can significantly improve the charge and discharge current and cycle life of lead-acid batteries. It has the characteristics of high power density, long cycle life and low price.
Lithium ion Battery
Lithium-ion batteries are composed of four parts: positive electrode material, negative electrode material, separator and electrolyte. According to the different materials used, they are divided into five types: lithium titan-ate, lithium cobalt oxide, lithium manganate, lithium iron phosphate, and ternary lithium. Lithium batteries and ternary lithium batteries have entered the mainstream market.
Ternary lithium and lithium iron phosphate batteries are not absolutely good or bad, but each has its own merits. Among them, ternary lithium batteries have advantages in energy storage density and low temperature resistance, which are more suitable for power batteries; lithium iron phosphate has three aspects. One of the advantages is high safety, the second is longer cycle life, and the third is lower manufacturing cost. Because lithium iron phosphate batteries have no precious metals, they have lower production costs and are more suitable for energy storage batteries. Blue Joy focus on produce Lithium ion battery 12V-48V.
Post time: Jan-18-2022