Car battery type
The main function of the vehicle battery is to start the engine and supply power to the entire vehicle electrical equipment at low engine speed. The requirements for automotive batteries are: large capacity, low internal resistance, and sufficient starting capacity. Automotive 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 required regular addition of electrolyte (distilled water), but the price was relatively cheap. With the maturity of the technology, it is now more and more popular to use more convenient maintenance-free batteries, but the price is relatively high. It has risen a lot. The lead-acid battery is composed of positive and negative plates, separators, shells, electrolytes and wiring pile heads. The chemical reaction of the discharge depends on the active material of the positive electrode plate and the active material of the negative electrode plate in the electrolyte (dilute sulfuric acid solution). The process is carried out in which the grid of the plates is made of lead-bismuth alloy. The traditional battery will reduce liquid during use. This is because the cesium on the grid will contaminate the lead on the negative plate, causing excessive decomposition of water. A large amount of oxygen and hydrogen will escape from the positive and negative plates, respectively. The liquid is reduced.
The maintenance-free battery is made of lead-calcium alloy. Since the battery uses lead-calcium alloy as the grid, the amount of water decomposition generated during charging is small, the evaporation of water is also low, and the sealed structure of the outer casing is used to release the sulfuric acid gas. Rarely, it has the advantages of no need to add any liquid, less corrosion to the wiring pile head, wires and body, strong anti-overcharge ability, large starting current and long storage time. Compared with traditional batteries, it has been used in recent years. The country is very popular.