Small-sized sealing nickel hydride charging button cell and preparation method thereof

Abstract

The invention relates to a small-sized sealing nickel hydride charging button cell for medical devices and a preparation method thereof. The method comprises the following steps: firstly, dividing anode conductive base materials evenly; coating anode active materials on the spaced anode conductive base materials; making a crease between the coating area and non-coating area, wherein the width of the crease is the same as the roll forming thickness of the coating area; stamping the anode conductive materials into a continuously circular shape in an integrally stamping manner after rolling the anode active materials; then folding the anode conductive base materials into anode groups according to the crease; placing the folded anode group into an anode shell; covering a septum on the anode group; dipping electrolyte solution and placing an insulating ring into the anode shell; placing the integrally die-casting cathode group into a cathode shell with cathode conductive base materials, and covering the cathode shell on the anode shell; and finally pressing and sealing. The invention has good security, favorable charging performance, simple manufacturing process, long service life and is suitable for large-scale and quick production.

Description

technical field [0001] The invention relates to a small sealed nickel-hydrogen rechargeable button battery for medical equipment and a preparation method thereof. Background technique [0002] Button battery is a commonly used battery, mostly used in medical equipment, household toys and other industries. Its characteristics require the battery to be small in size and high in safety. Disposable button batteries are routinely used, and the harmful substances are mainly mercury, and lead is also a heavy metal, which is toxic to the human body. A waste button battery can pollute 600,000 liters of water, which is equal to the amount of water a person drinks in a lifetime. A large amount of toxic and harmful substances such as mercury, cadmium, lead, acid and alkali in waste batteries leak into the environment, which will cause serious pollution and harm. [0003] The conventional production process of disposable button battery is to put the positive electrode material into the...

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Problems solved by technology

[0004] The existing nickel-metal hydride button battery, its process is basically the same as the disposable button battery, but its negative electrode is coated with a negative electrode active material on a conductive substrate such as a steel strip or foamed nickel, and loaded into the battery after punching. The problem with this method is that the negative electrode active material is easy to fall off, which affects the service life of the battery; the positive electrode of the positive electrode is coated on a conductive substrate such as nickel foam, punched and then layered into the battery case. The problem with this method is that the positive electrode is conductive. Poor performance, affecting battery discharge

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