Four major types of batteries in the field of electric vehicles leading you more optimistic about what kind?

Now there are four main types of electric vehicle batteries: lead-acid batteries, gelled lead-acid batteries, nickel-metal hydride batteries (Ni-MH), lithium-ion batteries. Four types of electric car battery performance and prospects of competition, you are more optimistic about what?

Lead-acid batteries: the weight ratio of energy is 28-40 Wh / Kg, the volume ratio of energy 64-72 Wh / I, too heavy, too large, and provide less power, shorter service life, as the power of electric bicycles, Generally only able to use about a year, if poor performance or improper use, only two or three months. In addition, lead-acid batteries have deep discharge capacity and low-temperature discharge capacity is poor, can not be quickly charged shortcomings. However, some progress has recently been made in the research of rapid charging of lead-acid batteries.

Colloidal lead-acid batteries: is an improved lead-acid batteries, replace the sulfuric acid electrolyte gel electrolyte, safety, storage capacity, discharge performance and service life than ordinary lead-acid batteries have improved. But in short, in the long run, lead-acid batteries have poor prospects of utilization in electric vehicles. Scrapped lead-acid batteries because of waste will cause secondary pollution, which is why some local governments will not support a lot of electric bicycles on the road one of the important reasons. Colloidal lead-acid batteries with stable performance, high reliability, long life, good adaptability to ambient temperature, withstand long-time discharge capacity, discharge capacity, deep discharge and high-current discharge capacity, with overcharge and over discharge self Protection, the battery can continue to pick up the load after 100% discharge, the charge can still be restored to the original capacity and so on in a few weeks. Disadvantages and valve control similar.

Nickel-metal hydride battery: Nickel-metal hydride battery is a new generation of battery family emerged in the nineties of the last century, the rapid development. Nickel-cadmium batteries and it belong to the same alkaline storage battery, hydrogen storage alloy material (mh) to replace the nickel cadmium battery cathode material Cd Cd, electromotive force is still 1.32v. It has all the excellent characteristics of nickel-cadmium batteries, and energy density is also higher than nickel-cadmium batteries. The main advantages are: higher specific energy (longer charge per charge), higher specific power and stable discharge at high current (good acceleration and climbing ability), good performance at low temperature discharge, long cycle life, safe and reliable, No maintenance, no memory effect, no pollution problem to the environment, recyclable, in line with the concept of sustainable development. However, Ni-MH batteries are too expensive and expensive.

Lithium-ion battery: more than the energy; high specific power; small self-discharge; no memory effect; good cycle characteristics; rapid discharge and high efficiency; wide operating temperature range; no environmental pollution, and therefore is expected to enter the 21st century the best Power supply ranks. It is estimated that the market share of MH / Ni battery will decrease when lithium-ion battery further develops from 2006 to 2012. Lithium ion market share will be expanded. Currently there are also electric bicycle products that use lithium-ion batteries for sale.

As the nickel-metal hydride batteries and lithium-ion batteries are green batteries, will not be secondary pollution caused by waste, easy to be accepted by the government environmental protection department, and have a good export prospects, although the current price is more expensive, there is still more room for price cuts should be Strongly promote. However, due to the relatively small impact on the environment compared to traditional cars, the prospects are widely favored, but the current technology is not yet mature.