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Nickel-metal hydride battery

A nickel-metal hydride battery and electrolyte technology, which is applied to nickel batteries, alkaline batteries, electrodes of alkaline batteries, etc., can solve problems such as the reduction of remaining capacity, and achieve the effect of inhibiting self-discharge

Inactive Publication Date: 2008-10-29
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Also, for example, even if the device is working, when the remaining capacity of the battery is detected based on the operating voltage and the remaining capacity is displayed on the LCD panel or LED, Although the remaining capacity is sufficient, it shows that the remaining capacity has decreased

Method used

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Examples

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Embodiment 1

[0060] 1. Fabrication of Negative Plate

[0061] Weigh the composition as La 0.10 Ce 0.05 PR 0.35 Nd 0.50 Mg 0.10 Ni 3.70 Al 0.22 The metal raw materials are mixed, and the mixture is melted in a high-frequency melting furnace to obtain ingots. The ingot was heated in an argon atmosphere at a temperature of 1000°C for 10 hours to make the crystal structure in the ingot into Ce 2 Ni 7 type structure or similar structure. Afterwards, the ingot is mechanically pulverized and sieved in an inert gas environment to obtain rare earth-Mg-Ni hydrogen storage alloy particles having the above composition. In addition, the average particle size of the obtained rare earth-Mg-Ni-based hydrogen storage alloy was 50 μm. The average particle size is a particle size corresponding to 50% of the weight integral in the particle size distribution of the rare earth-Mg-Ni hydrogen storage alloy measured using a laser diffraction / scattering type particle size distribution analyzer.

[0062]...

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Abstract

A positive electrode plate (3) of a nickel-metal hydride battery contains nickel hydroxide particles (18), a coating layer (19) covering at least a part of the surface of each nickel hydroxide particle (18) and mainly composed of a cobalt compound having an average valence of cobalt more than 2, and Nb-based particles (15) and Y-based particles (16) distributed among the nickel hydroxide particles (18). A negative electrode plate (4) contains a hydrogen storage alloy having a Co content of not more than 2.0% by mass, a separator (5) contains a fiber having a sulfone group, and an alkaline electrolyte solution contains sodium hydroxide as the main solute.

Description

technical field [0001] The present invention relates to nickel metal hydride storage battery. Background technique [0002] Ni-MH storage batteries are widely used due to their high capacity characteristics. However, nickel-metal hydride batteries tend to reduce the remaining capacity through self-discharge, and when they are used again after a period of time after charging, they need to be recharged. [0003] In order to improve this self-discharge problem, for example, in the nickel-metal hydride storage battery disclosed in JP-A-62-115657, a non-woven fabric made of sulfonated polyolefin resin is used as a separator. [0004] However, self-discharge cannot be sufficiently suppressed even in the nickel-metal hydride storage battery using the separator of the above-mentioned publication. [0005] Therefore, the inventors of the present invention have newly developed a nickel-metal hydride storage battery capable of suppressing self-discharge for a long period of time. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/30H01M4/38H01M2/16H01M4/52H01M4/24H01M4/62H01M4/32H01M4/66B22F1/00C22C19/00H01M10/28
CPCH01M10/0431H01M4/242H01M4/52Y02E60/124H01M10/345H01M2/1606H01M4/383H01M4/362H01M4/32Y02E60/10H01M50/44Y02P70/50H01M10/30H01M4/38
Inventor 泉康士前田泰史木原胜远藤贤大
Owner FDK CORP
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