Ni-MH Battery Cell

Ni-MH Battery Cell

20 May, 2024

Nickel Metal Hydride (Ni-MH) batteries are a popular rechargeable battery technology known for their high energy density, low self-discharge rate, and environmental friendliness compared to other battery chemistries.


How Ni-MH Battery Cells Work?


A Ni-MH battery cell consists of a positive nickel hydroxide electrode, a negative hydrogen-absorbing alloy electrode, a separator, and an alkaline electrolyte solution, typically potassium hydroxide.

hilong nimh battery cell

Key Characteristics of Ni-MH Cells


High Energy Density: Ni-MH batteries have approximately double the capacity of nickel-cadmium (Ni-Cd) batteries of the same size. A typical AA-size Ni-MH cell has a capacity of around 2200 mAh, compared to about 1000 mAh for a Ni-Cd cell.

Low Self-Discharge Rate: Ni-MH batteries have a relatively low self-discharge rate, retaining 50-80% of their charge after 12 months of storage. This is an improvement over older Ni-Cd batteries.

No Memory Effect: Unlike Ni-Cd batteries, Ni-MH cells do not suffer from the "memory effect" where the battery loses capacity if repeatedly only partially discharged before recharging. This makes Ni-MH batteries more convenient to use.

Environmentally Friendly: Ni-MH batteries do not contain toxic cadmium like Ni-Cd batteries, making them more environmentally friendly and easier to dispose of safely.

Wide Temperature Range: Ni-MH batteries can operate in a fairly wide temperature range of about -20°C to 50°C. However, they are more sensitive to high temperatures than some other chemistries.


Applications of Ni-MH Batteries


The combination of high energy density, low self-discharge, and environmental friendliness make Ni-MH batteries well-suited for many applications:

 ● Portable electronics like digital cameras, audio players, and older mobile phones

 ● Cordless power tools and appliances

 ● Electric toothbrushes and shavers

 ● Hybrid electric vehicles

 ● Solar energy storage systems

 ● Emergency lighting


Charging Ni-MH Batteries


Proper charging is important to maximize the lifespan and performance of Ni-MH batteries. Some key considerations:

 ● Use a charger designed for Ni-MH batteries with the correct voltage and charge termination method

 ● Avoid overcharging, which can damage the battery

 ● Charging too quickly at a high current can overheat the battery

 ● Occasional full discharges can help maintain capacity and avoid any minor memory effect


The Future of Ni-MH Technology


While lithium-ion batteries have surpassed Ni-MH in many applications due to their higher energy density, Ni-MH remains a mature, safe, and environmentally friendly battery chemistry. Continued research aims to further improve Ni-MH energy density, cycle life, and high-temperature performance to keep the technology competitive.


Hilong Ni-MH Battery Cell


In September 2002, Hilong established its first Ni-MH battery factory, dedicated to the production of high-quality high-energy Ni-MH battery products. Over the years, Hilong has never stopped R&D and investment in Ni-MH battery technology and production processes. After years of development, Hilong Ni-MH batteries are known for their stable quality, high capacity, and strong discharge capability. Battery products cover almost all models from capacity type to high power type, applied to all walks of life, and customers all over the world.

In summary, nickel metal hydride battery cells offer an attractive balance of performance, safety, and eco-friendliness that makes them well-suited for many rechargeable battery applications. By understanding how Ni-MH cells work and the best practices for their use, you can decide if they are the right choice to reliably power your devices or projects.

To learn more about how Hilong's battery products can benefit your industry, visit our website at or contact our team of experts today.  We look forward to working with you to unlock the full potential of Hilong Battery for your business.

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