Japan Storage Battery Co., Ltd.

Akira Kamada

Takao Omae

Masahiko Kosai

Masashi Watanabe

Graphite powder having a mean particle size not larger than 30 &mgr;m is added to a negative electrode plate for a lead storage battery. Preferably, the amount of graphite powder added is in the range of from 0.3% to 2% by weight. Preferably, vein powder is used as the graphite powder. More preferably, 0.3% or more by weight of an organic expander is added.

Negative electrode plate for lead storage battery

A lead-acid battery electrode plate is manufactured by consecutively supplying a lead or lead alloy sheet; leaving a part in the vicinity of the center of the sheet as a non-expansion portion and expanding both sides like mesh to form a grid body; filling active material paste into the grid body; and cutting the grid body to predetermined dimensions. In the lead-acid battery electrode plate, the non-expansion portion forms a current collector part of the electrode plate along an expansion portion in an up and down direction of the electrode plate. One or more openings are made in a part of the non-expansion portion. A part of the non-expansion portion is projected above the position of an upper margin of the cut expansion portion as a current collector lug part. When the current collector lug part is placed upside, the expansion direction is the width direction of the electrode plate.

Manufacturing method for a lead-acid battery electrode plate

Electrode plate for lead-acid battery

A valve-regulated lead-acid battery produced by a so-called container formation method including preparing a battery from unformed positive and negative plates filling a predetermined dilute sulfuric acid into said battery, and then applying an electric current to said battery so that the group of plates is formed by container formation is provided. The valve-regulated lead-acid battery has an negative active material containing an oil incorporated therein. The amount of the oil to be incorporated is from 0.05 to 1% by weight. The oil may be a paraffinic oil, naphthenic oil, olefinic oil, aromatic oil or silicon-based oil.

Growing community of inventors

Kyoto, Japan

Akira Kamada