To provide a manufacturing method of a battery case capable of manufacturing a battery case having a linear part and a curved part with good accuracy, and to provide a battery case with high strength and excellent dimensional accuracy.
The manufacturing method of the battery case includes a process of preparing a mother material made of aluminum or an aluminum alloy, and a process of forming a cylinder-shaped battery case, of which a cross section is composed of a linear part and a curved part, by drawing the mother material. A thickness of the linear part of the mother material is thicker than a thickness of the curved part. The battery case 1 composed of the linear part 10 and the curved part 11, without a difference between the thickness t2 of the linear part 10 and the thickness t1 of the curved part 11, having a uniform thickness as a whole, is obtained by drawing the mother materials having different thicknesses from each other.
SAIKI TETSUYA
TOMITA KOJI
Hidemi Aoki
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