When charging, electrical energy is converted into chemical energy, and when discharging, chemical energy is converted into electrical energy. When the battery is discharging, the metal lead is the negative electrode, and the metal lead is oxidized to lead sulfate. The lead dioxide is a positive electrode and is reduced to lead sulfate by a reduction reaction. When the battery is charged by direct current, lead and lead dioxide are generated at the two poles respectively. After removing the power supply, it returns to its pre-discharge state and forms an internally dynamically balanced chemical battery. Lead batteries are rechargeable and discharged batteries, also known as secondary batteries.

The reaction chemical equation of lead-acid battery is as follows:

The discharge -PbO2 + Pb + 2 - h2so4 ≒ PbSO4 + 2 h2o + PbSO4

Commonly used batteries are mainly divided into four types, namely ordinary battery, dry battery, wet battery and maintenance-free battery.

Ordinary battery

The plate of an ordinary battery is composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. Its main advantages are stable voltage, cheap price; The disadvantages are low specific energy (that is, the energy stored per kilogram of battery), short service life and frequent daily maintenance.

Dry load accumulator

Its full name is dry charged lead acid battery, it is the main feature of the negative plate has a high capacity of storage, in the completely dry state, can be saved in two years of electricity, use, just add electrolyte, such as 20-30 minutes can be used.

Lithium Battery Maintenance-free battery

Maintenance-free battery due to its own structural advantages, the consumption of electrolyte is very small, in the service life of the basic need not add distilled water. It also has the characteristics of shock resistance, high temperature resistance, small volume and small self-discharge. The service life is generally two times of the ordinary battery. There are also two types of maintenance-free accumulators on the market: the first is to add the electrolyte once at the time of purchase and do not need maintenance in later use (add supplementary solution); The other is that the battery itself has been added when the factory electrolyte and sealed, the user simply can't add a supplement.

General battery lead-acid battery is made up of positive and negative plate, plate, shell, electrolyte and wiring and other components of the pile head, the discharge of chemical reactions is depend on the positive plate active substances (lead dioxide and pb) and the negative plate active substances (spongiform pure lead) in the electrolyte (dilute sulphuric acid solution), under the action of the plate grid frame, traditional battery lead antimony alloy, maintenance-free battery is made of lead calcium alloy, the former with antimony, the latter with calcium, which is fundamental to both the mark. Different material can produce different phenomena: traditional battery will happen in the process of using liquid reducing phenomenon, this is because the gate frame of antimony can lead pollution on the negative plate spongiform pure, weakened after fully charged battery in the counter electromotive force, caused by excessive water decomposition, a large number of oxygen and hydrogen escape from the positive and negative plates respectively, reduce the electrolyte. Replace antimony with calcium, can change the full charge of the battery after the counter electromotive force, reduce the overcharge flow, liquid gasification speed, thereby reducing the electrolyte loss.

Shenzhen Topband Battery Co., Ltd.，established in 2006, is a wholly-owned subsidiary of Shenzhen Topband Co., Ltd. (002139.SZ). We focus on lithium iron phosphate batteries,with independent research and development in cells and BMS. With the ability to integrate the entire industry chain, we are committed to providing customers with one-stop lithium battery solutions and services. Our quality products are widely used in energy storage, low-speed vehicle, small power tools, power banks and other fields.