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AssigneeGS Yuasa Corporation
InventorsKazuya Okabe, Satoshi Yokota, Takahiro Itagaki, Tomonori Kishimoto, Shuichi Izuchi
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An object of the invention is to provide a sealed battery having a low resistance, excellent in the output power, and provided with a current collecting structure by setting welding points of a lower current collecting plate and a container bottom surface at specified positions without requiring a current collecting substrate with a special structure or a complicated welding method. The invention provides a sealed battery obtained by housing an electrode assembly (70) including a positive electrode plate and a negative electrode plate in a container (60), arranging an upper current collecting plate (2) on the electrode assembly (70), welding the upper surface of the upper current collecting plate (2) electrically connected with one of the electrodes of the electrode assembly (70) with the inner surface of a lid (50) through a lead (20, 30), using a safety valve formed by putting a cap (80) on the upper part of the center of a bare lid through a valve body (90) as the lid (50), arranging a lower current collecting plate (100) under the electrode assembly (70), and welding the lower surface of the lower current collecting plate (100) electrically connected with the other electrode of the electrode assembly (70) with the inner surface of the container (60) bottom and characterized in that welding points (100-1) of the lower surface of the lower current collecting plate (100) and the inner surface of the container (60) bottom are at least outside of positions (101) of the lower current collecting plate corresponding to immediately under the end part of the cap (80). The welding points (100-1) are at positions within a range between a concentric circle parted from the center by 48% and a concentric circle parted from the center by 93% in the length from the center to the outer circumference of the lower current collecting plate (100).
A sealed battery obtained by housing an electrode assembly comprising a positive electrode plate and a negative electrode plate in a container, arranging an upper current collecting plate on said electrode assembly, welding the upper surface of said upper current collecting plate electrically connected with one of the electrodes of said electrode assembly with the inner surface of a lid through a lead, using a safety valve formed by putting a cap on the center upper part of a bare lid through a valve body as said lid, arranging a lower current collecting plate under said electrode assembly, and welding the lower surface of said lower current collecting plate electrically connected with the other electrode of said electrode assembly with the inner surface of the container bottom;
A sealed battery obtained by housing an electrode assembly comprising a positive electrode plate and a negative electrode plate in a container, arranging an upper current collecting plate on said electrode assembly, welding the upper surface of said upper current collecting plate electrically connected with one of the electrodes of said electrode assembly with the inner surface of a lid through a lead, arranging a lower current collecting plate under said electrode assembly, and welding the lower surface of said lower current collecting plate electrically connected with the other electrode of said electrode assembly with the inner surface of the container bottom;
Dependencies are inferred from the claim text.