| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage device capable of preventing welding heat generated during bonding a case body and a lid by welding from being transmitted to an insulation member disposed between a terminal and the lid.SOLUTION: In a secondary battery 10, a positive electrode terminal 36 and a negative electrode terminal 37 which transfer electricity to and from an electrode assembly 12 project outside a case 11. Insulation members 38, 39 are disposed between the lid 14 and the positive electrode terminal 36 and the negative electrode terminal 37. The lid 14 and the case body 13 are bonded by welding in a state where a rear surface 14b of the lid 14 and end surfaces of side walls forming an opening portion 13x of the case body 13 are in contact with each other. A thin portion 46 positioned at an end of the lid 14 has a thickness in a thickness direction of the lid 14 smaller than a thickness of a portion which has largest area in the lid 14 in a planar view. The lid 14 has a gap 40 between projection portions of the positive electrode terminal 36 and the negative electrode terminal 37 and the thin portion 46 in region portions outside the positive electrode terminal 36 and the negative electrode terminal 37. |
