| 摘要 |
A battery case of a rectangular battery has a main body member that has the shape of a bottomed rectangular tube, and a lid member that has the shape of a rectangular plate. The main body member has a rectangular opening portion that is constituted of opening long side portions, opening short side portions, and opening R portions. The lid member seals the opening portion. The opening portion is configured such that each thickness of the opening R portions is larger than each thickness of the opening long side portions respectively. In addition, the opening portion and a lid peripheral edge portion are welded to each other in an airtight manner along an entire circumference thereof, by an energy beam that is radiated from outside the lid member in a thickness direction thereof. |
| 主权项 |
1. A rectangular battery comprising:
an electrode body; and a battery case made of metal, the battery case having a shape of a rectangular parallelepiped, the battery case accommodating the electrode body, and the battery case having a main body member and a lid member, the main body member having a shape of a bottomed rectangular tube, the main body member having a rectangular opening portion that has a pair of opening long side portions, a pair of opening short side portions, and four opening R portions, the four opening R portions linking the opening long side portions and the opening short side portions with each other respectively, and the four opening R portions being curved with arc shapes respectively, and the lid member having a shape of a rectangular plate, the lid member being inserted in the opening portion to seal the opening portion, the lid member having a lid peripheral edge portion, and the lid peripheral edge portion having a pair of lid long side portions that face the pair of the opening long side portions respectively, a pair of lid short side portions that face the pair of the opening short side portions respectively, and four lid R portions that face the four opening R portions respectively, each thickness of the four opening R portions being larger than each thickness of the pair of the opening long side portions respectively, and the opening portion of the main body member and the lid peripheral edge portion of the lid member being configured to be welded airtightly along an entire circumference of the opening portion and the lid peripheral edge portion. |
