Closed nickel-hydrogen storage battery and its production method

A nickel-metal hydride storage battery and a manufacturing method technology, applied to nickel storage batteries, alkaline storage batteries, battery electrodes, etc., can solve problems such as ineffective effects, and achieve the effects of improving performance, expanding application range, and good cycle performance
CN1739210AActive Publication Date: 2006-02-22GS YUASA INT LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GS YUASA INT LTD
Publication Date
2006-02-22

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Abstract

By solving the above problems, a closed nickel-hydrogen storage battery (1) excellent in high-rate discharge characteristic and in charging / discharging cycle characteristic is realized. The closed nickel-hydrogen storage battery (1) is characterized in that a nickel-rich layer (11) having a thickness of 50 to 400 nm is formed on each particle of a hydrogen storage alloy powder, the nickel-rich layer (11) is also formed on the surface of a crack (12) continuous with the surface of the alloy particle, the mass saturated magnetization of the alloy powder is preferably 2.5 to 9 emu / g, and the content of magnetic nickel is 0.5 to 1.9 mmol per gram of the hydrogen storage alloy powder. Such a hydrogen storage alloy is subjected to a hydrogen storing step, an alkali treatment step, a product removing step, a hydrogen releasing step, and air partial oxidization step, and thus an alloy powder is produced. Using this alloy powder, a battery having the characteristics mentioned above is manufactured. The invention can be effectively applied to a corrosion-resistant hydrogen storage alloy containing Er, Y, and Yb.
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Description

technical field

[0001] The invention relates to a nickel-metal hydride storage battery and a manufacturing method thereof, and more particularly relates to the improvement of the high-efficiency discharge characteristics of its negative electrode. Background technique

[0002] In recent years, there has been a rapid increase in the number of electric machines that require high-current discharge, represented by electric vehicles and electric tools. As a power source for these devices, a sealed nickel-metal hydride storage battery has higher energy per unit volume and unit mass than nickel-cadmium storage batteries, lead storage batteries, etc., and has recently attracted attention as an environmentally clean power supply. In addition, since the oxygen generated on the positive electrode can be absorbed by the negative electrode containing hydrogen storage alloy during overcharging, the nickel-metal hydride storage battery has the advantages of simple charging control method a...

Claims

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