List of five types of new energy batteries such as lithium batteries

Power batteries are the "heart" of new energy vehicles. Batteries, motors and electronic control systems are the three key components of new energy vehicles. Among them, the power battery is the most crucial part, which can be said to be the "heart" of new energy vehicles.

Five types of new energy battery analysis:

First, lead acid battery

As a relatively mature technology, lead-acid batteries are still the only batteries for electric vehicles that can be mass-produced because of their low cost and high-rate discharge. At the Beijing Olympics, there were 20 electric vehicles using lead-acid batteries to provide transportation services for the Olympic Games.

However, the specific energy, specific power and energy density of lead-acid batteries are very low, and electric vehicles using this as a power source cannot have good speed and cruising range.

Second, nickel-cadmium battery and nickel-hydrogen battery

Although the performance is better than that of lead-acid batteries, it contains heavy metals, which can cause environmental pollution after being abandoned.

Nickel-hydrogen battery has just entered a mature stage, and it is the only battery system that is currently verified and commercialized and scaled in the battery system used in hybrid vehicles. The current market share of hybrid batteries is 99% nickel-hydrogen battery, commercial The representative of the chemical is the Toyota Prius. At present, the world's major automotive power battery manufacturers mainly include Japan's PEVE and Sanyo. PEVE occupies 85% of the global Hybrid Ni-MH battery for power vehicles. Currently, the main commercial hybrid vehicles such as Toyota's Prius, Alphard and Estima, As well as Honda's Civic, Insight, etc., PEVE's nickel-hydrogen battery packs are used. In China, Changan Jiexun, Chery A5, FAW Pentium, General Motors and other brand cars have been in the demonstration operation, they also use nickel-metal hydride batteries, but the battery is mainly purchased abroad, the domestic nickel-hydrogen battery in the car still in the R&D matching phase.

Five, fuel cell

Briefly, a fuel cell (FuelCell) is a power generation device that directly converts chemical energy present in a fuel and an oxidant into electrical energy. Fuel and air are fed into the fuel cell separately, and the electricity is wonderfully produced. It looks like a positive and negative electrode and electrolyte, like a battery, but in fact it can't "storage electricity" but a "power plant."

The most promising for automobiles is the proton exchange membrane fuel cell. Its working principle is: sending hydrogen to the negative electrode, through the action of the catalyst (platinum), two electrons in the hydrogen atom are separated. Under the attraction of the positive electrode, the two electrons generate electricity through an external circuit, and the electrons lose electrons. Ions (protons) can pass through the proton exchange membrane (the solid electrolyte), recombining with the oxygen atoms and electrons into water at the positive electrode. Since oxygen can be obtained from the air, as long as hydrogen is continuously supplied to the negative electrode and water (steam) is taken away in time, the fuel cell can continuously supply electric energy.

Because the fuel cell directly converts the chemical energy of the fuel into electrical energy, without passing through the combustion process, it is not limited by the Carnot cycle. At present, the fuel-electric energy conversion efficiency of a fuel cell system is 45% to 60%, while the efficiency of thermal power generation andspecial power is about 30% to 40%.

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