SECONDARY BATTERY, BATTERY PACK, VEHICLE, AND STATIONARY POWER SUPPLY

• Main Authors: MATSUNO SHINSUKE, KYUSEKI HIROSHI, HOTTA YASUYUKI, KUBOKI TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a secondary battery capable of achieving high safety by suppressing gas generation.SOLUTION: A secondary battery according to an embodiment includes an electrode group and a resin portion. The electrode group includes a positive electrode, a negative electrode, and a porous separator holding an aqueous electrolyte. The positive electrode includes a positive electrode current collector having a positive electrode tab portion, a positive electrode active material-containing layer supported on at least one surface of the positive electrode current collector, and an ion conductive layer. The negative electrode includes a negative electrode current collector having a negative electrode tab portion, and a negative electrode active material-containing layer supported on at least one surface of the negative electrode current collector. The positive electrode active material-containing layer is positioned within a space formed between the positive electrode current collector and the ion conductive layer. The electrode group is directly covered with the resin portion except for a portion of the positive electrode tab portion and a portion of the negative electrode tab portion.SELECTED DRAWING: Figure 2 【課題】ガス発生が抑制されることにより、高い安全性を達成可能な二次電池を提供すること。【解決手段】１つの実施形態によると、二次電池が提供される。二次電池は、電極群と、樹脂部とを備える。電極群は、正極、負極、及び、水系電解質を保持した多孔質セパレータを備える。正極は、正極タブ部を有する正極集電体、正極集電体の少なくとも一方の面に担持された正極活物質含有層、及び、イオン伝導層を備える。負極は、負極タブ部を有する負極集電体、前記負極集電体の少なくとも一方の面に担持された負極活物質含有層を備える。正極活物質含有層は、正極集電体とイオン伝導層との間に形成される空間内に位置している。電極群は、正極タブ部の一部及び負極タブ部の一部を除いて、樹脂部で直接的に被覆されている。【選択図】 図２