Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Patent
1998-10-29
2000-07-11
Maples, John S.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
429163, H01M 202
Patent
active
060870400
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a container where alkaline solution is packed.
More specifically, it concerns a battery exterior container of alkali manganese batteries and the nickel cadmium batteries. Moreover, it concerns the surface treated steel sheet that is suitable for making thereof.
PRIOR ART
A method of barrel plating after press forming cold-rolled steel strip into a battery container or a method of press forming nickel-plated steel strip into a battery container have been adopted for manufacturing a battery container for such as alkali-manganese batteries and nickel cadmium batteries in which strong alkaline solution is packed. The reason why nickel plating is used for batteries such as alkali manganese batteries and nickel cadmium batteries is as follows. Nickel having excellent corrosion resistance to alkali is suitable for these batteries whose electrolyte is chiefly strong alkaline potassium hydroxide. Moreover, nickel is suitable for batteries since nickel has steady contact resistance when the battery is connected with an external terminal. Furthermore, nickel has excellent spot welding properties in case where each component is spot welded when assembled into a battery in the battery manufacturing process.
By the way, recently the main current of the plating method has been pre-plating, in which a steel strip is nickeled beforehand, replacing past barrel plating. It was difficult to manufacture products of high quality steadily by the past barrel plating because the difference of the plating thickness was large and it was especially difficult to nickel inside the container uniformly. As for pre-plating, the method of giving thermal diffusion processing after nickel plating has come to be applied chiefly to improve corrosion resistance. Now, the relation between the battery performance of the alkali manganese battery and the positive electrode container (battery container) is described hereafter. The said battery performance and the properties of the inside of positive electrode container are closely related. It is said that the lower the contact resistance between the inside of the positive electrode container and the positive electrode mix of the alkali manganese battery (consisting of manganese dioxide as a positive electrode active material, graphite as a conductor, and potassium hydroxide as electrolyte), the more excellent the battery performance. As for alkali manganese battery, the positive electrode mix and the positive electrode container are in contact, and the positive electrode container serves as not only a container of the battery but also as a conductor which transfers electrons.
Therefore, when the contact resistance between the positive electrode mix and the inner surface of the positive electrode container is great, the internal resistance of the battery rises. It causes decrease in the operation voltage and in the electrical discharge duration, obstructing the battery performance. So, it is desirable to decrease the contact resistance between the positive electrode mix and the inner surface of the positive electrode container. Therefore, roughing the surface inner surface the positive electrode container, making a ditch on the positive electrode container in the vertical direction, and applying conductive coating or a conducting material made by adding binder to graphite are proposed to decrease the contact resistance between the positive electrode mix and the inner surface of the positive electrode container.
Next, the press-forming method of the battery container is described.
Recently, DI (drawing and ironing) forming method is increasingly used as a method of thinning wall to increase the capacity of the battery replacing the past multi step deep drawing method (see Published Japanese Patent Hei 7-99686). This DI forming method and DTR (drawing thin and redraw) forming method is capable of increasing the battery capacity because the container side wall being thinner than the bottom thickness allows more positive electrode and negative ele
Ohmura Hideo
Ohmura Hitoshi
Tomomori Tatsuo
Maples John S.
Toyo Kohan Co. Ltd.
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