What are the Advantages of NiMh Rechargeable Batteries? especially when they are designed for your specific product or application. PMBL have many years of experience in designing and assembling NiMh Rechargeable Battery Packs.
The key to obtaining all the advantages that NiMH Battery Technology has to offer is to make sure that it is the right battery composition for your application or product. Talking to an experienced custom battery design and assembly company is one way of ensuring that you make the right choices up front. Located in the UK, PMBL can provide all you need for custom battery pack design.
As part of our initial discussions, PMBL work with clients to establish exactly which Battery Technology is the right one for their needs. From then on, attention to detail and full customer support brings the final assembled battery pack to life. Many of our battery solutions require specific terminations and wrapping. These issues and requirements are identified as early in the process as possible so that a clear set of objectives are established.
Many applications can benefit from the advantages of NiMH rechargeable batteries, so wehat are they? Here are just some of the advantages NiMH Battery Technology has to offer:
- 30 - 40 % higher capacity over a standard Ni-Cd.
- The Nickel Metal Hydride Battery has potential for yet higher energy densities.
- Less prone to memory than the Ni-Cd.
- Periodic exercise cycles are required less often.
- Simple storage and transportation - transportation conditions are not subject to regulatory control.
- Environmentally friendly - contains only mild toxins; and
- Profitable for recycling.
Unfortunately, there are always some limitations that should also be taken into account as part of the design decision making process:
- Limited service life - if repeatedly deep cycled, especially at high load currents, the performance starts to deteriorate after 200 to 300 cycles.
Shallow rather than deep discharge cycles are preferred.
- Limited discharge current - although a Nickel Metal Hydride Battery is capable of delivering high discharge currents, repeated discharges with
high load currents reduces the batterys cycle life. Best results are achieved with load currents of 0.2C to 0.5C (one-fifth to one-half of
the rated capacity).
- More complex charge algorithm needed - the Nickel Metal Hydride Battery generates more heat during charge and requires a longer charge time than
the Ni-Cd. The trickle charge is critical and must be controlled carefully.
- High self-discharge - the Nickel Metal Hydride Battery has about 50 percent higher self-discharge compared to the Ni-Cd. New chemical additives
improve the self-discharge but at the expense of lower energy density.
- Performance degrades if stored at elevated temperatures - the Nickel Metal Hydride Battery should be stored in a cool place and at a state-of-charge
of about 40 %
- High maintenance - battery requires regular full discharge to prevent crystalline formation.
- About 20 % more expensive than Ni-Cd - Nickel Metal Hydride Battery designed for high current draw are more expensive than the regular version.
If you would like more information on the Advantages of NiMh Rechargeable Batteries and how they can help you develop your application or product: