NICKEL METAL HYDRIDE
The rechargeable sealed Nickel Metal Hydride (NiMH) cell absorbs hydrogen in the metal alloy makeup of its negative electrode during charge. As the cell is discharged, the metal alloy releases hydrogen to form water.
The use of the metal alloy is the underlying reason for the high energy density of the NiMH cell compared to other chemistries. NiMH batteries have a long cycle life and good storage characteristics.
Furthermore, the battery can be recharged at any time without experiencing voltage depression (or memory effect). Most importantly, the NiMH battery is an environmentally friendly product.
Over 55 Standard Cells
Specialized Cells Available
- Standard Series
- High Current Capable Series
- High Temperature Capable Series
Multiple Form Factors
- Cylindrical Form Factor
- Prismatic Form Factor
- Button/Coin Form Factor
Table 1
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Advantages
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Disadvantages
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Typical Application
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High volumetric and gravimetric energy density
Long cycle life
Good storage characteristics
No memory effect/voltage depression
Environmentally friendly
Slow and rapid charge compatible
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Overcharge/ over-discharge protection needed
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Cellular phones, camcorders, emergency backup lighting, power tools, laptops, electric vehicles
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Typical Performance Characteristics of NiMH Batteries
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Operational Battery Voltage
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0.9 to 1.5 Volts
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Specific Energy
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50 to 70 Wh/Kg
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Energy Density
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180 to 220 W/L
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Power Density
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450 to 550 W/Kg
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Continuous Rate Capability
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Typical: 3C
High Rate: 10C
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Pulse Rate Capability
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Up to 25C
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Cycle Life at 100% DOD
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Typically 500
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Calendar Life
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3 - 5 years
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Self Discharge Rate
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25% / month
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Operable Temperature Range
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-20 °C to 60 °C
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Memory Effect
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None
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Note: Characteristics can change according to improvements in chemistry or special niche requirements.
Contact Us to receive a detailed engineering specification sheet.
