Energy storage technology is mainly divided into power storage and heat storage, and the current energy storage methods are mainly divided into three categories: mechanical energy storage, electromagnetic energy storage, and electrochemical energy storage. Electrochemical energy storage refers to various secondary battery energy storage. It is the use of chemical elements as energy storage medium, and the charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium.

At present, electrochemical energy storage mainly includes lead-acid batteries, flow batteries, sodium-sulfur batteries, lithium-ion batteries, etc. At present, lithium batteries and lead storage batteries are the mainstay.

1. Lead-acid battery energy storage

Lead-acid battery is a kind of electrode is mainly made of lead and its oxide, and the electrolyte is a sulfuric acid solution. Now widely used internationally, cycle life up to 1000 times domination, power can reach 80%-90%, cost-effective, often used in power system incident power or backup power.

Disadvantages: Assuming a deep, agile high-power discharge, the usable capacity decreases. It is characterized by low energy density and short lifespan. Lead-acid batteries have advanced their cycle life a lot this year by adding a super-active carbon material to the negative plate of a lead-acid battery.

2. Lithium-ion battery energy storage

Lithium-ion battery is a kind of battery that uses a non-aqueous electrolyte solution by using a physical metal or alloy as the negative electrode material. Mainly used in portable mobile devices, its power can reach more than 95%, discharge time can reach several hours, cycle times can reach 5000 times or more, care agile, is the highest energy practical battery in the battery, and is now the most used. Over the years, technology has also been upgraded, and positive and negative electrode materials have also been used.

The mainstream power cone batteries in the market are divided into three categories: drilling acid batteries, manganese acid hammer batteries and iron phosphate batteries. The former has high energy crushing, but the safety is slightly worse, the latter is the opposite, domestic electric cars such as BYD, most of them now use potassium iron phosphate batteries. But it seems that foreigners are playing ternary batteries and iron phosphate batteries?

Lithium-sulfur battery is also very popular, with sulfur as the positive electrode, metal carp as the negative electrode of a battery, its theoretical specific energy density can reach 2600wh/kg, practice energy density up to 450wh/kg. However, how to greatly advance the battery's charge-discharge cycle life and application safety is also a big question.

Disadvantages: There are safety questions such as high quotation (4 yuan/wh), overcharge causing heating, combustion, etc., and charging maintenance is required