Digital battery

Introduction: Ni-MH battery based on the hydrogen storage alloy electrode replacement Ni-Cd Cd electrode and developed a new type of batteries of high capacity rechargeable alkaline, becoming green energy is aujourd ‘Today an important direction of development of a secondary Laptop battery. The advantage is a greater energy density than the energy of the Ni-Cd 1.5 to 2 times, and resistance to overcharge, no memory effect, the advantages long battery life and the absence of metal pollution of the environment CD unique, it is as a national “95″ major projects of high technology research. After years of research and development, Ni-MH battery has become the market for rechargeable batteries (particularly the market for mobile), advanced products, to form their own country have been established and emerging industries.

 

1 works of the Ni-MH battery

 

Ni-MH material of the battery anode is an alloy hydrogen storage, a hydrogen absorption and desorption can be reversibly alloy. It’s the early seventies developed a new type of functional materials, which, under certain conditions, alloy reversible storage of hydrogen can absorb or release large numbers of hydrogen, d ‘ such a singular performance was applied to hydrogen storage and purification, This alloy is used resulting in turn heat pumps, compressors, catalysts, hydrogen cars burning, the separation of isotopes of hydrogen and so on. Ni-MH Ni-Cd have the same positive, ie hydroxy-nickel oxide as positive electrode, negative alloy extremely hydrogen storage, between positive and negative electrodes are separated by a membrane, while electrolyte solution is formed by the KOH and LiOH. [1] Ni-MH IBM ThinkPad X60 battery electrode chemical reactions that occur are:

 

Loading, the reaction at the cathode: Ni (OH) 2 + OH → NiOOH + H2O + e

                    Negative reaction: M + H2O + e → MH + OH —

Discharge cathode: NiOOH + H2O + e → Ni (OH) 2 + OH —

                   Negative: MH + OH-→ H2O + M + e

 

When overcharging and over the discharge occurs when the following reaction:

 

Overload, the positive electrode: 4OH-→ 2H2O + O2 +4 e

 

Cathode: 2H2O + O2 +4 e → 4OH —

 

Was released, the cathode: 2H2O +2 e → H 2 OH 2 —

 

Anode: H 2 → 2-OH 2H2O +2 e

 

Loading, the positive Ni (OH) 2 into NiOOH, the water molecules in the alloy hydrogen storage negative electrode on the discharge, the decomposition of hydrogen atom VGP-BPS9/S adsorbed on the surface electrode to form hydrogen atoms adsorbed. And then spread to the internal alloy hydrogen storage alloy reacts with hydrogen storage to form metal hydrides.

 

Disclaimer, enter e NiOOH-Ni (OH) 2 metal hydride hydrogen atom diffusion on the inner surface of the formation of adsorbed hydrogen atoms, the recurrence of the electrochemical reaction of alloy storage of ‘hydrogen and water. Over-discharge, the cathode can be restored on the consumption of NiOOH has been completed (the Ni-MH batteries are generally designed to be more negative), while H2O will be restored in the nickel electrode.

 

Overload due to the anode can be oxidized Ni (OH) 2 became NiOOH, when the formation of OH-lost e-O2, O2 spread cathode catalyst, the alloy hydrogen storage to be formed e-OH-, is also may produce negative hydrogen compounds in water, heat, so that the toshiba PA3191U-4BRS battery temperature, but also reduce the internal pressure of the battery. As the alloy hydrogen storage on the anode has been saturated with the absorption of hydrogen can not absorb hydrogen, this time, the water molecules in the cathode on discharge shape H2, H2, and a catalyst in the alloy hydrogen storage to the cathode under the infiltration of water on the compound of oxygen.

 

2, Ni-MH battery manufacturing process of batteries

 

Ni-MH battery can be made alkaline button-shaped or cylindrical, so different cell types, its structure similar to Ni-Cd batteries, especially for the sandwich-like. Ni-MH alloys manufacturing battery storage of hydrogen are primarily the preparation, positive and negative form, a pole piece assembly and so on. A typical link type Ni-MH battery manufacturing process of the battery is as follows:

 

 

Alloys for hydrogen storage apple A1060 battery should have a storage capacity of hydrogen, the equilibrium pressure of hydrogen moderate (0.01-0.5 MPa), good chemical stability in alkaline solution, abundant resources, low price and so on. Developed alloy hydrogen storage can be divided into four groups. Who have been marketed only AB5-type alloy, its actual capacity reached 330mAh / g, close to the theoretical value (372mAh / g). AB2 Laves phase alloys type are the subject of further research, quality of light, high capacity Mg-based AB2-type alloy While interest in people, but its capacity fading fast in order to achieve practical standards still need some time. To improve the life of an alloy hydrogen storage and a fast charge and discharge properties, surface treatment of alloys and diversified. Introduce the method of preparation of alloys for hydrogen storage are mainly gas atomization, centrifugal melt-spinning method, such as directional solidification method.

 

Currently used primarily to improve the sintering and impregnating parameters to increase the size of the sintered nickel cathode specific capacity, improving the ratio of volume capacity of sintered nickel positive electrode of a maximum of 500mAh/cm3 [4 ], while Ni-Cd ordinary sintered nickel positive electrode The volume ratio of capacity is only 400mAh/cm3. Ni-Cd in general need to add a small amount of nickel in the positive electrode to increase the charging efficiency of nickel cathode, reducing its rate of expansion; Ni-MH TravelMate 290 battery anode instead of adding Zn and Co to achieve the same results, and improve the absorption capacity of hydrogen battery, the control cells increased internal pressure.

 

3, at home and abroad to present Ni-MH battery research

 

3.1 current domestic battery Ni-MH Research

 

China in 70 years began to explore alloy hydrogen storage LaNi 5 electrode materials for the research opportunity is to make the material LaNi 5 physical properties and chemical and electrochemical properties. So Po Helanfeili first alloy LaNi 5 pluralistic makes Ni-MH batteries, with its U.S. and Japan, represented by a few developed countries, has launched a competition Ni-MH battery research practices and industrial development, in the shortest period of time have a marketing of Ni-MH BTP-43D1 battery market. China is the United States and Japan in the industrial development after the first developing countries. In 1995, China produced 2 million (equivalent to AA-type) batteries, the output value 210 million yuan in 1996, produced 31.4 million in 1997, producing 52 million in 1998 produced 80 million , an increase very rapidly. Tianjin Peace Bay in 1998 from the Toshiba Corporation to introduce technology and equipment. In February 1999, Tianjin blue sky, Sanyo, Japan, were introduced by Toyota, Ni-MH basic cell production, with an annual productivity of 30 million euros, and the formation of the corresponding battery, the product Sanyo’s latest is high capacity, fast charge, high reliability of the Ni-MH, with the highest level of the world. Developed by the Institute of Tianjin 1400mAhAA battery 1A charge-discharge, 100% DOD, the cycle life of more than 1000 times. Recently, Ni-MH battery-electric vehicles has been classified as medium development goals focus on long-term battery. Ni-MH battery industry in China over other countries in terms of manufacturing process of battery or product quality, varieties, there are many problems, the battery is not strong in the competitive international market. For example, the square sealed batteries because of these difficulties, lack of matching domestic manufacturers of parts and components, is not automated, and therefore not marketed. The existence of national capacity Ni-MH battery is small, short life cycle of high pressure, the discharge voltage is low self-discharge rate of greater uniformity and reproducibility is poor gap. Assembly of mobile phone batteries in China, Japan represents about 60% of the VGP-BPS9/B battery. On the Ni-MH battery recycling work at home or in white. China every year about 10 million cell phone batteries and other uses of the battery must be recovered and foreigners have been mostly recycling.

 

But we also know that our materials Ni-MH rich in resources, as early as 863 plans have Ni-MH battery included in development projects, 863 high-tech achievements exhibition was successfully presented the results of Ni-MH Rechargeable. As we all know, the China Central Television broadcast EV trial operation. These facts show that electric vehicles will be new applications Ni MH, potential for considerable development.

 

3.2 Visiting Ni-MH battery research

 

Since the early nineties of the last century have developed rapidly since the advent of NiMH batteries. Japan Nomura Research Institute, according to statistical analysis, since 1997 the global market size of a small battery has exceeded 500 billion yen in lithium-ion battery LIB 2,000 million yen market (ranked 1), the The old Ni-Cd batteries account for about ¥ 180000000000 (has a dominant position dropped to No. 2), Ni-MH VGP-BPS13A/B battery of about the maintenance of ¥ 120,000,000,000 (ranked 3).

 

As mobile communications, computing and portable consumer products has gradually begun to integrate the urgent needs of small batteries, light and efficient. Consequently, high energy density (Wh / kg), small and slim lithium-ion batteries LIB and Lithium Polymer (Lithium Polymer) batteries in recent years to obtain long-term development. In this case, one wonders, while pollution of the environment without Ni-MH battery will be developed? Ni-MH is technological innovation to develop new markets, new technologies and new products continue to emerge indicates that he has a beautiful view.

 

Ni-MH battery has been placed since the advent of mobile communications and the market for mobile computing with the lithium-ion batteries and lithium-polymer batteries a lot on the market, the increasingly competitive market. Many Japanese manufacturers produce lithium-ion batteries and Ni-MH and the output is high, they began to be produced manufactures lithium-ion batteries and Ni-MH products on the market for the sale of conflict has been a sense that it is open to Ni-MH new markets necessary. For example, the annual world production of 1997 lithium-ion batteries, Ni-MH and Ni-Cd value of hp Pavilion dv4000 battery power more than 500 billion yen, of which only the output value produced by Japanese manufacturers were more 400 billion yen (80% above), Japan 5 The major manufacturers (Panasonic batteries, Sanyo Electric, Toshiba, Hitachi Maxell, and Furukawa Battery Co., Ltd.) in 1997, production of Ni-MH value of cell production of 106.8 billion yen, which represents the value of total world production of Ni-MH (1200 billion yen) to 89%. Industry Analysis Japan and predict the time pointed out that in mobile communications and mobile computing applications, the lithium-ion batteries and lithium-polymer battery will become a mainstream product, Ni-MH battery in the 21st century in the first 10 years of back-up energy of the electric machine direction, it will drive electric vehicles and hybrid electric vehicles produced areas of current application.

 

Technology of the United States Molyech Power System allows the use of sintered electrodes for Ni-MH battery high current charge and discharge, which opens up scope wider. In particular, require a wide range of temperatures, withstand high vibration and high drainage capacity from the scope of high power will be widely applied to new technologies, equipment, Ni-MH battery. The Ni-MH battery in future areas of application are far from limited to mobile communications and mobile computing applications, but also on light applications, such as professional equipment and power tools to the consumer video, wireless equipment technical vacuum, and portable equipment and so on. These applications cover a wide variety of specific applications, as large as communications equipment remotely, UPS systems and electric vehicles, power small electric bicycle, light, power and even beauty tools and so on .

 

According to Japanese industry, has recently published a statistical analysis of the data table on the turn of the century, Ni-MH analysis of the Dell HD438 battery market forecasts are correct. On the mobile communications market, sales of Ni-MH decrease from year to year, sales of batteries LIB gradually increased: in 1998, lithium-ion batteries and Ni-MH strong sales of flat and more 28% each, Ni-Cd battery, and other revenue accounting for 43.4% battery, in 1999, LIB accounted for 34.1%, Ni-MH fell to 25.5%, Ni-Cd decreased to 40.4% in 2000, LIB rose to 38.8%, Ni-MH decreased to 22.9%, Ni - Cd and so on up to 38.3%. Opening new markets for Ni-MH were imminent, the Japan-US Ni-MH are the manufacturers accelerate the development of Ni-MH technology.

 

4 AA Ni-MH future developments

 

Since the introduction of Ni-MH batteries, and high energy and power required majority of applications have largely replaced Ni-Cd batteries Expected over the next Ni-MH battery will be applied to a wider range of tools High-power power. The Ni-MH batteries are used in high temperature environments, and develop a smaller and more efficient 40Y6795 battery capacity for high temperature, high vibration, and high efficiency of energy products and equipment, as hybrid electric vehicles, electric bicycle visualization tools for vehicles, UPS, telecommunications equipment, computers and supplies, emergency power lighting. For example, MOLTECH being developed in the airbag the size of a sintered Ni-MH batteries for hybrid vehicles. Although Ni-MH batteries as power supply for portable electronics best use lithium batteries have been challenges, but recent technology of production of sintered Ni-MH batteries will become the future for sustainable, high power and harsh environments of the ideal food. 

 

Generally, Ni-MH of China battery technology to track more research, basic research is little originality is not enough, of intellectual property rights, patents not pay enough attention they must be improved. We must put the limited human, material resources and financial combine. Intensification of production, capacity to overcome difficulties, and providing technical integration, complementary advantages, and actively participate in international competition. Capacity Ni-MH batteries and related materials, standardization of development. According to the national conditions of China, the Ni-MH batteries in electric bicycles, electric tricycle, electric four-wheeled vehicles, and other electric bikes on the prospect of application is vast.

 

5 Conclusion

 

Can be used as a source of energy despite a variety of cells, but low energy density of lead acid batteries, Ni-Cd can not fundamentally solve the problems of pollution, safety of lithium batteries -ion batteries is not enough and the price is expensive, Na2S battery temperature is too high, the electric vehicle fuel cell may be the ultimate choice problems, there are still more expensive. Ni-MH battery is a green battery, no pollution, no maintenance, safe, high specific energy and specific power, life support high levels of performance and discharge, long cycle, so they can meet the performance requirements of the battery. Therefore, the Ni-MH battery has been recognized as the world of real-world applications in recent years, with the best engine of choice.

The world’s largest thin film solar batteries first manufacturer to 0.87 USD per watt production costs 944 million U.S. dollars in 2009 mid-term revenue and market capitalization of 12 billion U.S. dollars, breaking the bubble theory of thin-film batteries. However, the technology of thin film Laptop battery with each passing day in this market, which will eventually Swordsman, at present it is still difficult to judge. ?

 

For the thin film batteries have launched the project poses potential problems arising, as prices dropped polysilicon, the market there is a concern - a relatively thin crystalline silicon battery IBM 40Y6799 battery film cost advantage will be weakened, some property owners or solar power plant will turn to the use of cost is significantly reduced in the crystalline silicon batteries and their components. Manufacturers Suntech polycrystalline silicon batteries and even the bar Shi Zhengrong also argued that “thin-film solar is definitely a bubble, and short-term challenge is very great that the conversion efficiency of over 15% and costs less than 5 percent of cases, have the opportunity.

 

The world’s largest thin film solar battery manufacturer first (First Solar) with the financial results of striking the thin film VGP-BPS2C batteries to suppress the outside world “bubble” in the conflict. After experiencing the first quarter of 2009 fell short chain, solar energy first in the second quarter income from operations reached $ 526 million, up 97%, 26% Bizenga ring in Meanwhile, not only improved its market share and market value in the holistic V manufacturers in the first place. In crystalline silicon batteries in the context of the sharp reduction in production costs, the thin-film batteries not only has not lost market share, but under the continuous improvement of technology, to resist unit pressure drop component, will further reduce unit production costs.

 

Downward trend in unit costs of production

 

First Solar in manufacturing is almost cadmium telluride (CdTe) thin-film batteries synonyms. Since 2002, cadmium telluride thin-film BATBL50L6 batteries to reach a production volume for the first solar energy has grown at an alarming rate, production of 6.5 MW from 2004 to 2008 of 504 MW, the rate of growth compound annual 139% in 2008, was Q-Batteries in production after the second largest photovoltaic manufacturers. The first half of 2009, income from the point of view, First Solar has Yueshen global PV manufacturers.

 

First Solar’s competitiveness steady decline primarily on the ability to continue to reduce unit manufacturing costs. Financial data revealed that the first unit cost of producing solar energy has increased from 2004 to U.S. $ 2.94 per / watt compressed to 2008 to U.S. $ 1.08 per watt. In the photovoltaic industry turn down in the fourth quarter of 2008, First Solar energy, the average cost of production fell to 0.98 U.S. dollars per watt, the cost of production is first in the world less than U.S. $ 1 per watt of solar energy companies. In 2009, to further reduce production costs, fourth and second quarter of 0.93 U.S. dollars / W and 0.87 USD / W. First Solar, president of the public said it expects its cost of production in 2014 thin film A1045 batteries are expected to lower the U.S. $ 0.52-0.63 per watt and efficiency of opto-electronic conversion is currently 10.9% to 12.5%.

 

Market share, increase rather than reduce

 

Zhou Tao, as the Great Wall Securities Research Institute estimates that if prices of polysilicon fall to 30-40 U.S. $ / kg, corresponding thin film toshiba PA3534U-1BRS battery production cost is 1.4 U.S. dollars per watt. A leading global supplier of polysilicon (Hemlock, MEMC, Wacker, etc.) unit costs were 30 U.S. dollars / kg, far lower than the U.S. domestic 60-80 dollars / kg costs, and thus see the price of polysilicon 30 U.S. dollars / kg is almost impossible, and batteries and components of production costs, the crystalline silicon batteries is difficult to compete with thin-film batteries. In addition, thin-film batteries suitable for automated production lines, the same work required for the production of crystalline silicon is only 1 / 25, the entire production process can be completed in 3 hours, much better than performance of crystalline silicon batteries.

 

Thus, despite the slowdown in crystalline silicon battery silicon crystal unit to provide more competitive, but increasing market share of thin-film batteries is an indisputable fact. The data show that manufacturers thin film hp PP2182D battery from the 2000 global market share of 10.1% to 12.5% in 2008, cadmium telluride and copper indium selenide Gallium thin-film batteries (CIGS) is still most extraordinary development, the growth rate is higher than the average PV. U. S. Energy Information Administration data show that the United States and Germany markets are experiencing the same trend: in 2008, the United States, 67.5% of PV modules using thin film technology, and from the latter in 2002 from less than 10% to 2007 years, nearly 40% in the German market adoption of photovoltaic thin films are up to 20%. In fact, because the crystalline silicon batteries and modules to the declining rate of production is lower than the cost of thin-film batteries, if the market share it has increased rather than decreased over the second quarter 2009, increase the share of thin-film batteries. Media Technology Green predicted that by 2012 the capacity of thin film batteries, solar energy accounted for 30% of total capacity.

 

Gross margin data also showed that the component units of the erosion of selling prices, solar energy first is almost not affected profitability. The fourth quarter of 2008, the first decline in short-term gross margin of solar BATCL50L energy, the two following quarters, gross margins have started to rebound in the first quarter of 2009, and in the second quarter reached a record high respectively.

 

However, because of differences between the two applications (crystalline silicon batteries in the solar roofs program has advantages, thin film batteries and photovoltaic power plant construction in large scale integration (BIVP) project is an advantage) industry and First Solar thin-film batteries is still “in a big” do not upgrade from the basic large-scale industry, so that a large-scale thin-film batteries will not replace crystalline silicon batteries.

 

Win in Chernical

 

Thin-part battery of the film market in the past, the steady increase is primarily attributable to the contribution of solar energy first. From a commercial point of view of the operation, the first solar energy is currently the only operating large-scale commercial manufacturers on a thin film Dell KD186 battery. 2008 shares of market thin-film batteries, the first account of solar energy for Liu Cheng. However, the rapid development of technology thin-film battery, in addition to the hands of the first solar thin film technology cadmium telluride battery, there are still two major types of thin battery technology of film production: the thin film silicon technology (such as a-Si) selenide and copper indium gallium thin-film technology.

 

Just the transformation efficiency perspective, the CIGS considerable advantage, in theory, the maximum effective rate of 19.9%, much higher than the 16.9% of cadmium telluride and silicon 12.8 %. Despite its raw materials, indium (In) is rarer, the world reserves are about 2 million tonnes, to 400 GW of 40Y6795 batteries available for use, but because of the current global CIGS few Manufacturers of batteries, and in 2010 the production capacity of 300 MW, the 14 tons of Indium be much lower than existing materials, the production of indium, the short-term reserves of the problem and not restrict the prospects of CIGS batteries.

 

From a cost perspective, the securities that although the price has dropped crystalline silicon, CIGS remain competitive prices. First, as CIGS batteries have not yet reached the volume of production, through the low cost of the demolition, taking into account the process similar to the cost of the membership of First Solar (primarily the depreciation of equipment, glass, materials and labor, etc.), and as a result of large-scale CIGS thin-film hp Pavilion dv6000 battery cost is about $ 1.07 U.S. per watt, well below the current cost of batteries crystalline silicon. Secondly, the CIGS batteries use glass substrates relatively inexpensive, such as rare elements needed for a significant reduction in the amount of wear effects In addition, the CIGS batteries better low light on the light requirements reduced Running time is much higher than the crystalline silicon batteries.

 

While the less efficient silicon-based photoelectric conversion thin-film batteries, because of unstable performance, the path of future development depends on technological progress. At The Great Wall Securities Zhou Tao seems, because of its key raw silane (SiH4) easily accessible, suitable for mass production, so if the conversion efficiency can be stabilized at 10% or more, will have a significant competitive advantage.