Sanyo Electric Co., Ltd.

Atsushi Obayashi

Eiji Okutani

Tomokazu Yamanaka

Hironori Marubayashi

Yoshikumi Miyamoto

Ryuji Oshita

Provided is a sealed battery that can offer excellent battery performances by having its electrode terminal and a current collector securely welded to each other, and its manufacturing method. The sealed battery is formed by hermetically sealing a casing storing an electrode assembly and the current collector, wherein: the electrode assembly formed by layering positive and negative electrode plates with a separator sandwiched therebetween is electrically connected to the current collector; and a shaft portion of the electrode terminal penetrates through the current collector. A part of the electrode terminal projecting out from a pass-through of the current collector is a (conical) frustum-shaped portion whose bottom base is in contact with the current collector. The frustum-shaped portion is pressed against the current collector, and the frustum-shaped portion and the current collector are welded together in at least one area on a perimeter of the bottom base of the frustum-shaped portion.

Sealed battery with electrode terminal welded to current collector, and manufacturing method for the same

A closed battery, according to the invention, comprises a substantially flat box-type outer casehaving electrical conductivity, provided with an opening on one side in the longitudinal direction thereof and other peripheral sides that are closed, a spiral electrode bodyhoused in the outer case, comprising a positive electrode, a negative electrode, and a separator interposed therebetween, an electrode current collector tablarger in thickness than a core body, welded to a cut and raised piece that is cut and raised from an exposed part of the core body of one of the electrodes of the spiral electrode body, and a sealing platefor covering and sealing the opening of the outer case, wherein the outer case is sealed by laser-welding with the electrode current collector tab being clamped between the rim of the opening and the sealing plate when sealing the opening of the outer case. Under the construction described above, since the mechanical strength of the electrode current collector tab is enhanced, improvements in the performance and reliability of the closed battery can be obtained.

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Osaka, Japan

Atsushi Obayashi