 Profile Ni-MH
BatteryStructural
Designs |
|
|
STRUCTURAL
DESIGNS |
|
 Ni-MH
BATTERY |
|
 Specification
tables |
The
nickel-metal hydride couple lends itself to the wound construction
shown
in Figure 1, which is similar to that used by present-day cylindrical nickel-cadmium cells. The basic components consist of the positive and negative electrodesinsulated by separators. The sandwiched electrodes are wound together and inserted into a metallic can that is sealed after injection of a small amount of electrolyte.The general internal construction of the prismatic cell is similar to the cylindrical cell except the single positive and negative electrodes are now replaced by multiple electrode sets.Thus the trade-off for improved packaging in select applications is increased complexity in cell assembly with the corresponding increases in production cost.Both cylindrical and prismatic nickel-metal hydride cells are typically two-piece sealed designs with metallic cases and tops that are electrically insulated from each other. The case serves as the negative terminal for the cell while the top is the positive terminal. Some finished cell designs, may use a plastic insulating wrapper shrunk over the case to provide electrical isolation between cells in typical battery applications.  |
| Overview |
|
| Features |
|
| Comparison
of Ni-MH and Ni-Cd Cells |
|
| Major
applications |
|
| Structural
designs |
|
| Electrochemical
processes |
|
| Discharge
characteristics |
|
| Charge
characteristics |
|
| Charging
methods |
|
| Cycle
life characteristics |
|
| Storage
characteristics |
|
| Safety
characteristics |
|
| Designing
for Ni-MH cells |
|
| Battey
pack designs |
|
| Battery
pack configurations designation system |
|
| Precautions
for using Ni-MH batteries |
|
| Battery
selection |
|
In
variation of this design, nickel-metal hydride cells are also being
produced in prismatic
versions
such as that illustrated in Figure 2. The prismatic cells may fit
more
easily into volume-critical
applications. |
|
 |
|
 |
|
 |
|
Fig.4
Structure Design of the Button type cell |
|
GREENCELL
Ni-MH batteries range in type from standard batteries to fast-charge
batteries,
or high
temperature batteries for exclusive use as in capacity from 65 mAhto
25 Ah to meet
diverse
user requirements. Though each type has its own structural
design
according to
its required performance, the basic
structural designis
identical.Fig.4
illustrated
Construction of GREENCELL Button Battery. |
|
 |
|
Fig.5
Structure safety vent for GREENCELL Cylindrical Battery |
|
Although
GREENCELL Ni-MH batteries are designed to completely recombine gas generated within their casings. they have a safety vent, as illustrated in Fig.5 which opens automatically and releases. Then it is resealed so that your battery can be used again. Furthermore, because GREENCELL Ni-MH`s original current collector is employed for both the positive and negative tabs, internal impedance is extremely small and excellent characteristics are exhibited, even under high-rate discharge conditions. |
|
