Car battery

četvrtak, 29.12.2011.

Car battery

In today's hot new energy vehicles, lithium-powered vehicles as one of the four cathode materials for lithium iron phosphate, has become a hot concept.

Since the beginning of this year, the lithium iron phosphate technology patent battle to upgrade the report has proclaimed. Several large multinational companies from Europe and America called lithium iron phosphate has the core technology patents, they played the patent battle. Moreover, more recent media reports, Phostech company from Canada and China battery manufacturer negotiations, and that "entry fee" $ 10 million to produce 1 ton of lithium iron phosphate demanding pay $ 2,500.

Patent battle seems to have given the technology by adding a more mysterious aura. However, it seems that the community of lithium iron phosphate has high hopes prematurely, the experts pointed out that the lithium iron phosphate power battery electric vehicle is not an effective solution.

"Do not iron phosphate lithium battery electric vehicles in the role of exaggerated." State 973 plans electric vehicle energy storage project's chief scientist, Professor Ma Zifeng Shanghai Jiaotong University, said, "the academic point of view, lithium iron phosphate does not may be the next major new energy automobile battery present lithium-ion battery cathode material, there are four, lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide and ternary materials from a single cell voltage of view, than cobalt lithium iron phosphate lithium and other materials are much lower energy density lithium iron phosphate is low, the battery system large volume, large-scale use may not be appropriate, need to do more technical demonstration. many companies rush to war on our lithium iron phosphate project, likely to be foreign companies loophole. "

Should not blind launched

In recent years, new energy automobile market is vigorously developed. Data show that by 2012, China will create 500,000 new energy automobile production capacity to 20,000 yuan battery bicycle use (considering the hybrid and pure electric vehicles), the average level of estimates, the domestic automotive battery market could reach 10 billion yuan, equivalent to the current lithium battery market grew 100%. 2020, new energy vehicles driven global automotive battery market demand will exceed 200 billion yuan. It is undeniable that the Chinese car battery industry will usher in rapid development of the golden opportunity.

In contrast, in the hot behind the new energy automobile market, the corresponding battery technology is also increasingly on the agenda. At present, China's new energy vehicle development layout showing a pure electric vehicles, fuel cell vehicles and hybrid neck and neck situation. Pure electric vehicles currently on the market are mainly used nickel-metal hydride batteries, lead acid batteries and lithium batteries. Should be said that a variety of technologies are not enough, there are some flaws, many laboratories and companies still have to improve.

Currently On the whole, there is a lithium battery safety issues. Whether lithium manganese oxide or lithium iron phosphate, from the cycle life, reliability, security, in terms of charge-discharge performance, there are a variety of defects. "Domestic power last couple of years (600,627, stock it) pool is very large enterprise projects, can be a real breakthrough did not. Lithium batteries in five parts: the cathode material, anode material, electrolyte, separator, packaging, each items are very important, are all core technology. research which has been a very, very different. "Triangle Changshu Institute of Technology, Changsha green energy Yongkang said.

As a result, the frenzy of lithium iron phosphate partly reflects the mentality of most Chinese enterprises now. A technology not yet mature in the premise, do not put more effort and money spent on technology research, choosing instead to quickly launched, this is really a waste of resources.

In addition, the quality of domestic and foreign lithium batteries there is a great gap between the main mode of production in different decision. Zhejiang University of Chemical Engineering and Materials Science Professor Wang Lianbang said: "Chinese enterprises mechanization and automation with foreign countries vary greatly, many of which are handmade. A battery can not see it, hundreds of batteries in a series, the difference is obvious. the gap between the quality consistency of the main battery from raw materials to products, there are very many processes. a number of different quality products are not the same. 100 batteries, there are 2 may not be very good, which is the mode of production the problem, not 2012 to make up. "

Sand Yongkang also believes that consistency is not guaranteed a big problem. "In this way it is possible to do cell phone batteries, battery capacity is small because the phone. Open an electric car 150 kilometers to 15 kwh storage capacity of 20 kWh battery pack, cell phone batteries may be 1 watt, the equivalent of 15,000 times most of our businesses to use the machine plus the manual way, consistency is not high now the yield is still very low. "

Path to future technologies

If the lithium battery can not take on the future development of new energy vehicles task, then who can play a leading role it?

Although there are many domestic enterprises to promote lead-acid batteries, but due to the high contamination of this feature makes this product not to be optimistic about the development when there are more helpless feeling. "Lead metal refining, manufacturing batteries, battery recycling process are contaminated, only cars on the road when there is no pollution, so can not say that this is clean energy than lead-acid battery technology to promote a worthy present lead-acid battery has 45% of Chinese production, Europe and the United States will use, but not manufacturing, not recycling, pollution in China. "Sha Yong Kang said.

Instead, the fuel cell is a lot of experts look for direction, there are many international giants continue in this field force. Is a hydrogen fuel cell and the oxygen in the air combine to form water by the electrochemical process and generate electrical energy generating device. Fuel cells work without combustion, no moving parts, with the energy conversion efficiency (actual efficiency of an ordinary internal combustion engine 2 to 3 times), no noise, long operating life, high reliability, maintainability and good; it is the only a product is water, truly meet the clean, renewable requirements. Since 1994, the first fuel cell vehicle came to a few dozen years now, technology is developing rapidly.

Action, the current world of fuel cells in various countries, the development of fuel cell vehicle technology to give a very high concern. Toyota has announced that first fuel cell vehicles will be available in 2015. Last September, Toyota, Honda, Hyundai, Ford, General Motors, Daimler, Kia Motors Corporation and other well-known joint statement calling on governments in 2015 to build more hydrogen fuel infrastructure. If this goal can be achieved, from 2015, worldwide there are hundreds of thousands of hydrogen-powered vehicles will be gradually achieved commercial production. Although the cost of car fuel is still very high, but this is truly meet the cleanliness standards of technology, the industry believes that with the expanding scale of production, cost reduction is only a matter of time.

At the same time, hydrogen safety has become the focus of everyone worried about this, Zi-Feng Ma said, the world of technology for hydrogen safety studies very hard, hydrogen as petrochemical, metallurgical and pharmaceutical industries important raw materials, their storage and transportation arrangements have a very good solution. Our project team is involved in the development of 973-vehicle hydrogen storage of national standards and international standards, the laboratory has reached 70 MPa hydrogen cylinder, and commercial use at about 35 MPa only, greatly increased the safety factor. In addition, the hydrogen source is diversified. Currently in Shanghai, peak power vary widely, summer electricity shortages, and spring off the electricity supply, the use of peak power can be electrolysis into hydrogen. As for Shanghai Baosteel, Shanghai Petrochemical and other large enterprises, large-scale hydrogen is a by-product, so that future prospects are bright.

On the direction of view, the innovation of new energy vehicles is bound to promote the expansion of battery technology. Zi-Feng Ma believes that the future of fuel cells and batteries or fuel cells and capacitors to be combined, combine the advantages of both, is a good direction. "We know that a good power rating for the design of the fuel cell, hydrogen and oxygen electrochemical reaction by the constraints of the output power is stable, such as loading 60 kilowatts of fuel cell vehicles, slow down or stop when the fuel cell is always at work, then more charge storage devices give out, when the car accelerating or climbing, the fuel cell power can not be turned into 70 kilowatts from 60 kilowatts, this will be supplemented with storage devices, this combination will help to improve the dynamic performance In short, we should select some more direction, more cutting-edge place to look, such as our cooperation now and in the University of Michigan study of lithium - air batteries, the latest technology, this relatively remote, to 15 years will have a big development. "

Sand Yongkang also believes that the new energy vehicle technology is very diverse, and should not be all eyes are focused on the battery itself. The concept of new energy must be wide, with wide concept have new ideas. Perhaps in the near future will be able to find a new liquid fuel, methanol and ethanol can replace. Another example is the use of wireless power technology in the car. Although long-distance applications there are certain problems, but the Massachusetts Institute of Technology in 2007, this technology can be lit by 2 meters away, 60-watt bulb, which gives people unlimited reverie. The future, the wireless power technology combined with the car might be a viable option, save the plug so tedious steps.

New energy vehicles is undoubtedly the future direction of development, after 50 years is likely to fade out conventional diesel when the stage of history. However, as the sand Yongkang said: "The new energy vehicle development to broaden thinking, not staring at a mature production technology blindly. Can not see the market to engage in the project, only for research funding, subsidies to state action." Japan Toyota, Honda and other manufacturers like a day ten years of painstaking research a technology, once mature, strong market, other companies can only be far behind to catch up. In contrast, Chinese companies want to turn to overtake the field of new energy vehicles, still need to stop.

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29.12.2011. u 02:52 • 0 Komentara • Print • #

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četvrtak, 29.12.2011.

Car battery

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