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Hydrogen storage alloy, nickel-metal hydride storage battery, and manufacturing method of hydrogen storage alloy

A nickel-metal hydride storage battery and hydrogen storage alloy technology, applied in the direction of nickel storage battery, alkaline storage battery, battery electrode, etc., can solve the problems of micronization, corrosion difficulty, micronization, easy generation, etc., and achieve the effect of high power output characteristics

Active Publication Date: 2018-04-10
PANASONIC EV ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Micronization and corrosion tend to occur near 0% or 100%, so the above problems are less likely to occur
However, when applied to hybrid vehicles (including plug-in hybrid vehicles), the range of charging rate is 20% to 80%, so micronization and corrosion are difficult to occur, and the above problems are likely to occur

Method used

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  • Hydrogen storage alloy, nickel-metal hydride storage battery, and manufacturing method of hydrogen storage alloy

Examples

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Effect test

Embodiment

[0023] Hereinafter, examples will be described in detail. In this example, nickel-metal hydride storage batteries were manufactured under the following conditions, and their characteristics were evaluated.

[0024] Hydrogen storage alloys were prepared as follows. First, rare earth elements are prepared, and more specifically, misch metals formed by alloying a mixture of lanthanide elements are prepared. Rare earth elements are La, Ce, Pr (praseodymium), Nd (neodymium), Sm (samarium), and the like. Next, as a preparatory step, a raw material composition obtained by mixing the mixed rare earth metal with Ni, Co, Mn, and Al according to a predetermined composition is prepared. In addition, as a production step, a hydrogen storage alloy is produced by processing by a melting quenching method. The melt quenching method is a method of solidifying the molten material from a molten state at a cooling rate of 1000° C. / second or higher after melting a prepared raw material compositi...

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Abstract

The present invention provides a hydrogen storage alloy capable of maintaining high power output characteristics of a nickel-hydrogen storage battery, a nickel-hydrogen storage battery having the hydrogen storage alloy as a negative electrode, and a method for producing the hydrogen storage alloy. The hydrogen storage alloy is a hydrogen storage alloy composed of AB5 type alloy. The main component of the A element is a rare earth element, and the B element has nickel as a main component and contains at least one of aluminum and manganese. Furthermore, in the cross-section of the hydrogen storage alloy, the ratio of the region where aluminum and manganese exist in relatively high concentrations is 0.5% or more. In addition, the present invention uses this hydrogen storage alloy as the negative electrode of the nickel-metal hydride storage battery.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, a nickel-hydrogen storage battery with the hydrogen storage alloy as a negative electrode, and a method for manufacturing the hydrogen storage alloy. Background technique [0002] In general, nickel-metal hydride storage batteries have high energy density and excellent reliability, and are widely used as power sources for mobile devices, portable devices, etc., or as power sources for electric vehicles and hybrid vehicles. The nickel-metal hydride storage battery is composed of a positive electrode mainly composed of nickel hydroxide, a negative electrode mainly composed of a hydrogen-absorbing alloy, and an alkaline electrolyte solution containing potassium hydroxide or the like. [0003] Such a hydrogen storage alloy constituting the negative electrode of the nickel-metal hydride storage battery repeats expansion and contraction during hydrogen absorption and release cycles, resulting in micronizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/30C22C19/03C22C30/00
CPCC22C19/03C22C30/00H01M4/385H01M10/30Y02E60/10
Inventor 家口圣广大川和宏八尾刚史
Owner PANASONIC EV ENERGY CO LTD