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| Ni-MH Batteries |
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The extensive range of Ni-MH Batteries offered by us is based on latest technology and conforms to set industry standards. These Batteries have similar characteristics of the sealed nickel-cadmium batteries with a slight difference. In stead of cadmium, hydrogen is used as the active element at a hydrogen-absorbing negative electrode (anode), which is made from a metal hydride. The alloys of lanthanum and rare earths that serve as a solid source of reduced hydrogen are oxidized to form protons. The electrolyte is a alkaline potassium hydroxide. NiMH batteries are widely used high voltage automotive applications having cell voltage of 1.2 Volts
Now that the technology is reasonably mature, NiMH batteries have begun to find use in high voltage automotive applications. Further, the energy density is more than double that of lead acid and 40% higher than that of NiCads
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| Features: |
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- Accept both higher charge and discharge rates and micro-cycles thus helping applications which were previously not practical
- The components of NiMH batteries include a cathode of Nickel-hydroxide, an anode of Hydrogen absorbing alloys and a Potassium-hydroxide (KOH) electrolyte
- Like NiCd batteries, Nickel-metal Hydride batteries are susceptible to a "memory effect" although to a lesser extent
- These are more expensive than lead-acid and NiCd batteries, but they are considered better for the environment
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| Advantages: |
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- High energy density
- Typical cycle life is 500 cycles (less than Nicads).
- Can be deep cycled.
- Using NiMH batteries, up to 3000 cycles at 100 % Depth of Discharge (DOD) have been demonstrated. At lower depths of discharge, for example at 4 % DOD, more than 350.000 cycles can be expected.
- Robust - NiMH batteries also tolerate over charge and over discharge conditions and this simplifies the battery management requirements.
- Low internal impedance
- Flat discharge characteristic (but falls off rapidly at the end of the cycle)
- Wide operating temperature range
- Rapid charge possible in 1 hour
- Trickle charging can not normally be used with NiMH batteries since overcharging can cause deterioration of the battery. Chargers should therefore incorporate a timer to prevent overcharging.
- Because of potential pressure build up due to gassing they usually incorporate a re-sealable vent valve
- Reconditioning is possible.
- Environmentally friendly (No cadmium mercury or lead)
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| Applications: |
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- Low cost consumer applications
- Electric razors
- Toothbrushes
- Cameras
- Camcorders
- Mobile phones
- Pagers
- Medical instruments and equipment
- Automotive batteries
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