SECONDARY BATTERY AND BATTERY PACK

• Main Authors: NAGAI HIROYOSHI, ISOBE KOICHIRO, MATSUI TAKAAKI, NAKATAKE AKEMI, IGUCHI HIROKI, OKANISHI DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 13.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a technique that makes it possible to ensure more adequate insulation of a housing of a secondary battery.SOLUTION: A secondary battery 1 includes a box-shaped housing 10, an electrode body 30 accommodated in the housing 10, and an insulating film 40 covering a range from a lower end to an upper end of the housing 10. The insulating film 40 has a configuration in which, in a width direction of at least one side face (long side face) of a pair of side faces (long side faces) having a relatively large width of four side faces of the housing 10, an upper end in a center part is extended above upper ends of both end parts.SELECTED DRAWING: Figure 1 【課題】二次電池の筐体の絶縁性をより適切に確保することが可能な技術を提供する。【解決手段】本開示の一実施形態に係る二次電池１は、箱形の筐体１０と、筐体１０に収容される電極体３０と、筐体１０の下端から上端に亘る範囲を覆う絶縁フィルム４０と、を備え、絶縁フィルム４０は、筐体１０の４つの側面の中で幅が相対的に大きい一対の側面（長側面）の少なくとも一方の側面（長側面）の幅方向において、中央部の上端が両端部の上端よりも上側に延長されている。【選択図】図１