NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Author: KAWAMOTO YUTA
• Format: Patent
• Language: English; Japanese
• Published: 30.04.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a new non-aqueous electrolyte secondary battery in which occurrence of uneven salt concentration in an electrode body is suppressed.SOLUTION: A non-aqueous electrolyte secondary battery 1 includes an electrode body 20, a non-aqueous electrolyte solution (not shown), and a battery case 10 for accommodating the electrode body 20 and the non-aqueous electrolyte solution. The battery case 10 includes a case body 11 having an opening, and a lid member 12 for covering the opening 11a. The case body 11 has a bottom surface 11b on an opposite side to the opening 11a, and a side surface 11c that is provided to be erected continuously with the bottom surface 11b and arranged along a lamination structure. When the side surface 11c is divided into a first portion P1 on a side closer to the opening 11a and a second portion P2 on a side closer to the bottom surface 11b along one direction connecting the opening 11a and the bottom surface 11b, the average thickness of the second portion P2 not less than 0.6 time and not more than 0.75 time the average thickness of the first portion P1.SELECTED DRAWING: Figure 3 【課題】電極体の塩濃度ムラの発生が抑制された新しい非水電解液二次電池を提供する。【解決手段】ここに開示される非水電解液二次電池１は、電極体２０と、非水電解液（不図示）と、電極体２０および非水電解液を収容する電池ケース１０と、を備える。電池ケース１０は、開口を有するケース本体１１と、開口１１ａを蓋する蓋部材１２とを備える。そしてケース本体１１は、開口１１ａとは反対側の底面１１ｂと、底面１１ｂに連続して立設され、積層構造に沿って配置される側面１１ｃとを備える。側面１１ｃは、開口１１ａと底面１１ｂとを繋ぐ一の方向に沿って、開口１１ａに近い側の第１部分Ｐ１と、底面１１ｂに近い側の第２部分Ｐ２とに分けたとき、第２部分Ｐ２の平均厚みが第１部分Ｐ１の平均厚みの０．６倍以上０．７５倍以下である。【選択図】図３