IP Library › Granted Patent US 7,560,188
Granted Patent B2
US 7,560,188 · App. 10/930,790 · Granted Jul 14, 2009

Nickel-metal hydride rechargeable battery

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Quick Facts
Patent No.
US 7,560,188
App. No.
10/930,790
Granted
Jul 14, 2009
Kind
B2
Abstract

In a nickel-metal hydride rechargeable battery comprising a positive electrode of nickel hydroxide and a negative electrode of hydrogen-absorption alloy, prolonged battery life is achieved by limiting the charge and discharge operations to be performed in the range of 20-60% of the hydrogen-absorption capacity of the hydrogen-absorption alloy.

Claims (10)

1. A process of operating a nickel-metal hydride rechargeable battery comprising:

charging and discharging the battery in a range of 20-60% of hydrogen-absorption capacity of the hydrogen-absorption alloy;

wherein the battery comprises:

a positive electrode comprising nickel hydroxide;

a negative electrode comprising a hydrogen-absorption alloy; and

a separator interposed between the positive and negative electrodes; and

a facing area between opposing negative and positive electrodes is in the range of 45-65 cm 2 /Ah per negative electrode capacity.

2. The process according to claim 1 , wherein an average particle diameter of the hydrogen-absorption alloy is in the range of 10-25 μm.

3. The process according to claim 1 , wherein a quantity of an alkaline electrolyte per negative electrode capacity is in the range of 1.5-3 g/Ah.

4. The process according to claim 2 , wherein an average particle diameter of the hydrogen-absorption alloy is in the range of 10-15 μm.