| CPC H01M 50/566 (2021.01) [H01M 50/105 (2021.01); H01M 50/183 (2021.01); H01M 50/30 (2021.01); H01M 50/534 (2021.01); H01M 50/536 (2021.01); H01M 2220/20 (2013.01)] | 15 Claims |
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1. A laminated battery, comprising:
an electrode body;
a bag-shaped outer casing made of laminated films; and
an electrode terminal,
wherein
the outer casing has a weld portion in which inner surfaces of the laminated films are stacked and welded together in a peripheral edge of a space which accommodates the electrode body,
the electrode terminal is constituted by a clad material in which one end of the electrode terminal is made of a first metal and another end of the electrode terminal is made of a second metal different from the first metal,
one of the first metal and the second metal is made of copper or an alloy mainly composed of copper, and a plating coat layer is provided on a surface of a portion of the copper or the alloy mainly composed of copper,
the plating coat layer comprises at least one material selected from the group consisting of nickel, molybdenum, zirconium, titanium and a trivalent chromium compound,
the electrode terminal passes between the laminated films stacked on each other in the weld portion and is inserted into the outer casing,
the one end of the electrode terminal is electrically connected to the electrode body inside the outer casing and said another end of the electrode terminal is exposed to outside of the outer casing,
at least a plate-shaped part of the electrode terminal is inserted into the outer casing,
a surface of the plate-shaped part of the electrode terminal has
a surface-roughened portion at a position of the weld portion, and
a remaining portion that has an arithmetic average height lower than an arithmetic average height of the surface-roughened portion, the remaining portion being provided at an end portion of the surface-roughened portion inside the outer casing, and configured such that a width of the surface-roughened portion is partially reduced from an inner side of the outer casing toward an outer side of the outer casing,
the remaining portion is a specific region of the plate-shaped part of the electrode terminal and is welded to the outer casing,
the remaining portion of the surface of the plate-shaped part has a V-shaped portion in a plan view of the plate-shaped part of the electrode terminal, and
in the plan view, a width of the V-shaped portion in a direction perpendicular to a direction from the inner side of the outer casing toward the outer side of the outer casing is gradually decreased from the inner side of the outer casing toward the outer side of the outer casing.
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