The characteristics of Ni-MH battery Ni-MH battery is the hydrogen in the study prepared on the basis of a new type of energy. It uses a new type of cathode materials, and compared to nickel-cadmium batteries has the following advantages:

Above the energy of the same type Ni-MH battery that the battery capacity nickel-steel capacity 1.5-2 times high as the AA-size batteries, nickel steel is generally ap-800 milliamps, while the nickel-hydride batteries, metal may reach 1000 – 1500 milliampere hours.

No memory effect so-called memory effect refers to the portion of the discharge of the battery nickel steel, as if “remember” In the past, there is no end of electrical discharge when the battery reaches the discharge point, the tension of a permanent decline, while remaining within the capacity of the battery with the charging time increased so that the actual availability of electricity gradually reduced, so that devices Electrical work correctly. Ni-MH Dell Latitude D510 battery without memory effect, each time after use, regardless of days without discharge of residual charge may be payable directly.

Pollution due to nickel-hydride batteries contain metals cadmium, lead, mercury and other metals, it produces no pollution of the steel on the human body and environment are sound, called “green batteries. ”

Quick charge and discharge because of the benefits unique internal Ni-MH battery itself has a heavy load of excellent results and current discharge and cycle life can reach more than 510 times.

Operating voltage of the battery in the 1.2-1.3V operating voltage between the batteries and nickel-fu the same, do not need to change the design of electrical origin, you can replace nickel-cadmium batteries.

Therefore, nickel-hydride batteries, metal can be widely used not only for electronic equipment, instruments and meters, power tools, scooters, and communications equipment, but also for electric model aircraft, and the more we can say superior performance. The current nickel-metal hydride batteries are A, AA, AAA, SC models.

Electric model airplane purchased for the performance of the Dell Latitude D520 battery electric model aircraft is currently used in electric motors are DC permanent magnet motor. Its high speed, no load speed of 10,000 rpm or more, the current work is great. Figure 1 is the text of this motor characteristic curve of a typical IQ. Of the IQ curve can be seen with the Q value increases gradually, I straight up, therefore, the performance requirements of batteries are very strict, mainly in the following points:

1. The power density to be great is the instantaneous discharge performance is better. No significant drop in output voltage in conditions show more effect of the current ideal, which requires the battery internal resistance should be particularly low. Figure 2 Equivalent circuit for the battery circuit. As shown on the graph: the door) engine operating current l = E / R + Zn is not only limited by their resistance, but also, and the battery internal resistance r is closely related. Part of the internal resistance R of the electrical energy will be consumed into heat, causing the battery internal heat. (2) Lots of engine operating voltage. E-Ir, Ir fall When asked to output current is high (eg, motor 540 is internal resistance of 0.5 ohms, while the AA type Ni-MH Dell Latitude D600 battery internal resistance is generally more 10 cents to 30 cents between the European Union) battery internal resistance will not be ignored. For the electric model aircraft is, we try to use a small internal resistance of batteries, in order to facilitate urgent to improve the performance of discharge.

2. The energy density is higher. The density of the so-called energy refers to the unit mass of the battery capacity, with the mAh / g or Ah / kg representation, it is an important parameter for measuring the battery, the same weight capacity of the battery the more the better. For the model airplane for the airplane, although the weight of the power, but power was significantly increased on the other hand, can get the same amount of power, but reduce the weight of the model plane has greatly improved the power and performance of flight.

3. High capacity load current is better. For fans of model airplanes, the flight environment is often in the wild, their equipment and time are very limited, requiring the battery in a short period of time to add capacity, c That is what we call the crisis capacity. As the nickel-metal hydride power He has no memory effect, unlike nickel-tin batteries do not need to “put enough net” and may therefore be at the controls of a cycle without charge current IC discharge may be made to supplement the power. In addition, it should be good over-charging and over-discharge capacity, self-discharge rate is lower. The Dell Latitude D610 battery capacity of each combined cell resistance internal self-discharge, temperature and other properties must be strictly in line to achieve the best results.

China Ni-MH battery state of current world production of nickel-metal hydride batteries mainly by the Japanese monopoly. China in the early eighties to begin production in 1996, total production of about 30 million, and foreign products less capacity, ICLL% DOD cycle charge and discharge at least 500 times the rate of uniformity of products is poor, is not conducive to the combination of higher prices. However, since 1997, some local manufacturers to produce a nickel-hydride power metal to greatly improve quality, such as rare earth Jining wide, Zhuhai and if the battery company with Professor Wang Jisan invention “that the penetration electrode technology “production of nickel-metal hydride batteries, electric model aircraft flying tests, the effect is ideal. Test models used for the modification of P3A plus imports of 05 engines. Impeller for D180, Model H120, a takeoff weight of 1,000 grams, the Dell Latitude D620 battery voltage is 7. ZV. Based on test data to see AA-capacity battery type has reached 1400-1500 mA, resistance to an average of 15-18 cents in Europe, self-discharge of less than 15% weight 25 grams, the cost reduced by 30%, selling prices and steel battery Nickel was near. This amateur model aircraft, which proved to be a good news, but to replace the nickel-steel cell is a solid foundation.

Ni-MH battery and maintenance 1. Nickel-metal hydride batteries used currently, there are three main methods of charging, fast charging, load push standard slow charge. Charging time and current charge may refer to following table:

Table C for the nominal capacity of the battery mAh; I for the charge mA, T for hours charging time. Standard generally constant load current, constant voltage, the load pulse wave. Most of the rectifier 10 is currently commercially available current-limiting device means simple pieces of nickel charger. A proposed self-television company D adjustable mA constant current source for nickel-hydride batteries in metal. Depending on the size of current selection, charging time: T = 1.4-1.5) C / I calculation. In addition, the absence of exceptional circumstances, is generally not used for more urgent IC load current from the Laptop battery to prevent excessive internal pressure increases, causing a leak, damage to the battery.

2 Ni-MH battery car, the discharge capacity of large, non-use of electricity must first be laid off after the store, and the standard charge and discharge every six months once.

3. Under normal circumstances, the battery and the discharge time up to 500 times or more, with the increase in charge-discharge capacity will decrease, resistance increases, the capacity utilization of a year carry out inspections to prevent overcharging and over discharging. 4. Remove the battery should be stored long-term need.

Apparently, these new pink materials, is the best material for photoelectric conversion, despite the conversion efficiency has been implemented in commercial silicon solar batteries by half, but its cost is only one fourth of solar batteries silicon.

Pink dye sensitized solar batteries is the most typical color. Most dyes contain a ruthenium, ruthenium red. With the red dye mixed with rose powder most commonly used metal oxide is titanium oxide or zinc oxide, these two types of metal oxides are white. However, researchers at Ohio University created a IBM ThinkPad R50 battery more innovative materials does color, they used metal complex, exploring different particle shapes to improve performance of photoelectric conversion.

This is the first time, researchers use non-unique dye manufacturing oxide sensitized solar batteries. Choose stannate zinc because zinc stannate belongs to the complex oxides with tunable properties. This characteristic makes the next cut of dye sensitized solar batteries possible.

Why dye sensitized solar batteries are pink rather than blue like silicon solar batteries do? Traditional solar batteries with a Dell Latitude D510 battery blue because the fight against the causes of reflective coating. These include improving the absorption of light green, light green spectrum is the most powerful solar light. Ohio University researchers developing complex materials and it is not anti-reflective coating.

Color determines the solar battery can capture the wavelength of light, scientists can change the color of the special characteristics of solar batteries optimized. Currently, the development of dye sensitized solar batteries, scientists have used ruthenium red dye obtained the best results.

If you want to get the best efficiency, we must consider access to voltage and current. The tension is a kind of material can provide the potential energy, now is the amount of material capable of transmitting the hp Pavilion dv2000 battery charge. If you can absorb a wide range of wavelengths, it would have to sacrifice power. If the absorption of energy limit is very high, can achieve high voltage, but had to sacrifice being. Researchers want to find a fair balance.

Since the 20th century, 60 years since the silicon solar batteries appeared. Since the 20th century, scientists began to develop the dye sensitized solar batteries 90. In the dye sensitized solar batteries, dye molecules cover the tiny particles of metal oxide have lived, and with the insertion of a thin film. Dye molecules capture light energy and release electrons, while the metal oxide particles was more like a thread, will be among the electronic transmission to the circuit, but the transfer of electrons between the particles may be lost. These researchers are developing tiny sony VGP-BPS5 battery nanowires to merge to be sent directly to the causes of electronic circuits.

They are also exploring the possibility of using nano-trees – nano-son-shaped tree branches etc.. Which structure is to absorb light and improve the current structure? The researchers studied tree! Leaves provide a large surface for capturing light, the branches will be transferred to the roots of nutrition. In their design of dye sensitized solar batteries, dye particles will cover the surface, the nano-trees do not grow between the leaves of these branches, electronic transmission.

Therefore, the following dye sensitized solar batteries grow a tiny tree “pink”, but other colors are also possible. Researchers are studying to work better in the new apple A1008 battery dyes and dye compounds.