SECONDARY BATTERY

• Main Authors: MIZUMOTO MASAHIRO, SAITO SHIGEKI, YAMAMOTO TATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 27.06.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a secondary battery which is compatible with both methods of laser welding and ultrasonic bonding, as a method for joining a lid member and a cap.SOLUTION: One aspect of the present disclosure provides a secondary battery including a lid member 12 and a cap 31. The lid member 12 includes a protrusion 24 formed around a liquid injection port 21, on a top face 22 of the lid member 12 on a side where the cap 31 is laser welded or ultrasonically bonded in a plate thickness direction. The cap 31 includes: a groove 42 that is formed on a first surface 41 of one surface of the cap 31 in the plate thickness direction and that can be engaged with the protrusion 24; and a smooth surface 44 that is formed on a second surface 43 of the other surface of the cap 31 in the plate thickness direction and that can be brought into surface contact with the tip surface of the protrusion 24. The outer peripheral surface formed on the outer periphery of the cap 31 is inclined toward the inside of the cap 31 along the way from a first surface 41 side to a second surface 43 side.SELECTED DRAWING: Figure 2 【課題】蓋部材とキャップとを接合する工法として、レーザ溶接と超音波接合の両工法に対応できる二次電池を提供する。【解決手段】本開示の一態様は、二次電池において、蓋部材１２は、蓋部材１２の板厚方向におけるキャップ３１がレーザ溶接または超音波接合される側の上面２２にて、注液口２１の周囲に形成される突起部２４を備え、キャップ３１は、キャップ３１の板厚方向の一方の面である第１面４１に形成され、突起部２４と嵌合可能な溝部４２と、キャップ３１の板厚方向の他方の面である第２面４３に形成され、突起部２４の先端面と面接触可能な平滑面４４と、を備え、キャップ３１の外周に形成される外周面は、第１面４１側から第２面４３側に向かうに連れてキャップ３１の内側に向かって傾斜している。【選択図】図２