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Introduction to the types of car battery

2021-07-07 00:00:00

The main function of the car battery is to start the engine and supply power to the entire vehicle's electrical equipment at low engine speeds. The requirements for automotive batteries are: large capacity, small internal resistance, and sufficient starting ability. Car batteries include wet-charged batteries, dry-charged batteries, low-maintenance batteries and maintenance-free batteries. Modern cars basically use maintenance-free batteries.

Most of the early batteries were ordinary lead-acid batteries, which needed to be added with electrolyte regularly, but the price was relatively cheap. As the technology matures, maintenance-free batteries that are more convenient to use are becoming more and more popular, but the price is relatively higher. A lot.

Lead-acid batteries are composed of positive and negative plates, separators, shells, electrolyte and terminal posts. The chemical reaction of its discharge is dependent on the active material of the positive plate and the negative plate in the electrolyte (dilute sulfuric acid solution). Next, the grid of the pole plate is made of lead-antimony alloy. The phenomenon of liquid loss occurs in traditional batteries during use. This is because the antimony on the grid will contaminate the lead on the negative plate, causing excessive decomposition of water, and a large amount of oxygen and hydrogen will escape from the positive and negative plates, causing electrolysis. The fluid is reduced.

The maintenance-free car battery is made of lead-calcium alloy. Because the car battery uses the lead-calcium alloy as the grid, the amount of water decomposition generated during charging is low, and the amount of water evaporation is also low. In addition, the sealed structure of the shell also releases sulfuric acid gas. Very few, so compared with traditional batteries, it has the advantages of not needing to add any liquid, less corrosion on terminal posts, wires and body, strong resistance to overcharge, large starting current, long power storage time, etc. In recent years, it has It is very popular in China.