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High Capacity NiMH Battery
Packs and Intelligent Charging
May 2007
For over 20 years DMS has been supplying custom built batteries and power
systems for a wide range of applications across the whole spectrum of
industries.
Rechargeable NiMH batteries are rapidly becoming more advanced and their
uses are spreading into a wide variety of applications. Recent
developments have seen the introduction of higher capacity NiMH cells.
Accordingly, the demands for safe and fast battery chargers have
increased. DMS has recognised the importance of providing both the battery
and charger as a system to provide safe, reliable performance.
Our range of NiMH batteries combine high energy density with excellent
cycle life. In particular the 13Ah F cell and 9Ah D cell combine the
advantages of good capacity with light weight, making them particularly
suitable for portable devices. Our NiMH cells have excellent shock and
vibration characteristics and with an operating temperature range during
discharge of –30°C to +60°C, these batteries can be used in the harshest
of environments. They also have the ability to be discharged in any
orientation.
The NiMH battery offers design versatility. They are ideal for custom
build designs and standard applications requiring high performance.
Designed to meet the exacting requirements of the DMS’ range of high
energy density NiMH batteries, the NiMH SafeCharger™ is available in both
12V & 24V formats and capable of charging up to 20 cells. During the
charging process NiMH cells rely on correct termination and charging
algorithms to prevent cells from overheating and causing permanent damage.
For large capacity batteries such as the 9Ah and 13Ah cells the charger
termination is more critical due to the thermal issues of the battery. To
overcome these issues the NiMH SafeCharger™ incorporates three types of
charge termination, voltage sensor, temperature sensor and safety timer.
Furthermore the charger can recharge the packs in less than 6 hours from a
fully discharged state.
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