As
electronic products have come to feature more
sophisticated functions, more compact sizes
and lighter weights, the sources of power that
operate these products have been required to
deliver increasingly higher levels of energy.
To meet this requirement, nickel-metal hydride
batteries have been developed and manufactured
with nickel hydroxide for the positive electrode
and hydrogen-absorbing alloys capable of absorbing
and releasing hydrogen at high-density levels
for the negative electrode.
Because Ni-MH batteries have about twice the
energy density of Ni-Cd batteries and a similar
operating voltage as that of Ni-Cd batteries,
they are expected to become a mainstay in the
next generation of rechargeable batteries.
Features
of different cell types
A. Green power
Ni-MH batteries are an environmental friendly
chemical power source being free of Cadmium
and mercury.
B. Similarity with Ni-Cd batteries
These batteries have similar discharge characteristics
to those of Ni-Cd batteries.
C. Double the energy density of conventional
batteries
Our Ni-MH batteries have approximately double
the capacity compared with our standard Ni-Cd
batteries.
D. Cycle life equivalent to 500 charge and discharge
cycles
Like our Ni-Cd batteries, Nickel-metal hydride
batteries can be repeatedly charged and discharged
for about 500 cycles(IEC 61436 charge and discharge
conditions).
E. Rapid charge in approx. 1.2 hours
Our Ni-MH batteries can be rapidly charged in
about an hour using a specially designed charger.
F. Excellent discharge characteristics
Since the internal resistance of nickel-metal
hydride batteries is low, conditions for high-rate
discharge up to 4CmA is possible, similar to
Ni-Cd batteries.
G. Excellent high-current discharge Characteristics
The High rate discharge type cells About 90%
at 6CmA discharge and 85% at 10CmA discharge
for the rated capacity of 0.2 CmA discharge.
H. Economical and stable performance
The High rate discharge type cells are extremely
economical because the small capacity is enough
for large current discharge within a short period.
In addition, the high performance and long life
are the same as the general battery.
I. Large current
With extremely low internal resistance, large
current for the battery capacity may be obtained
in Consumer Type cells.
J. Interchangeable with 1.5V dry cells
Though the nominal voltage is 1.2V, the Consumer
Type battery can be used for 1.5V dry cell equipment
without problems.
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Types
and applications
In order to widen the useful scope and applications
of the Ni-MH cell and to use its advantages to
the fullest, special purpose types have been developed.
Detailed characteristics of special purpose batteries
are shown else where as individual data sheets.
There
are three types of Ni-MH batteries:
(1) General type
(Standard type)
(2) Consumer type
(3) High rate discharge type (P type)
(1)
General type (Standard type)
Features
A. Green power
B. Similarity with Ni-Cd batteries
C. Double the energy density of conventional
batteries
D. Cycle life equivalent to 500 charge and
discharge cycles
F. Excellent discharge characteristics
Application
examples
· Shaver, portable stereos, and portable
CD players.
· Portable copy machine, and Word processors.
· Digital cordless phones, cellular phone,
and wireless equipment.
· Power tools, toys, and lights.
(2)
Consumer type
Features
A. Long life and economical with more than
500 charging/discharging cycles.
B. Large current
C. Interchangeable with 1.5V dry cells
Application examples
· Radio, tape recorder, headphone stereo
system, video, electric shaver, handy
cleaner, handy dryer, electric toothbrush.
· Measuring equipment.
· Power tools, toys, and lights.
(3)
High rate discharge type (P type)
Features
A. Excellent high-current discharge Characteristics
B. Economical and stable performance
Application
examples
· Power tools including drills and saws.
· Toys, radio-controlled cars and airplanes.
· Other high rate discharge applications.
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