POWER STORAGE DEVICE, AND METHOD FOR MANUFACTURING METHOD THEREOF

• Main Authors: HIRAKI KENTA, SASAKI MIHO, TAKAHAGI ATSUKO, HAYASHI SHINJI, YAMAZAKI MASAYASU
• Format: Patent
• Language: English; Japanese
• Published: 12.04.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a power storage device which enables suppression of occurrence of unevenness in distribution of a pressure put on a power storage device located at a lower position when a plurality of power storage devices are stacked on each other and which has corrosion resistance, and a manufacturing method thereof.SOLUTION: A power storage device comprises an electrode body and an outer packaging body. The outer packaging body serves to seal in the electrode body. The outer packaging body is formed by a film-like exterior packaging member. The outer packaging body includes a first seal part where the electrode body is sealed in; the first seal part is formed by bonding together faces of the film-like exterior packaging member, which are opposed to each other in the state of being wound around the electrode body. A first face is larger than a second face in area. The first seal part does not overlap with the first face in plan view. The exterior packaging member is composed of a laminate having at least a base material layer, a barrier layer and a heat-fusable resin layer in this order. The barrier layer includes a piece of aluminum alloy foil which satisfies the following composition requirement: Fe is 0.2 mass% or more and 2.0 mass% or less, and Mg is 0.1 mass% or more and 5.0 mass% or less.SELECTED DRAWING: Figure 1 【課題】複数の蓄電デバイスを積み重ねた場合に下方の蓄電デバイスに掛かる圧力の分布のムラを抑制可能であり、かつ、耐腐食性を有する蓄電デバイス及び該蓄電デバイスの製造方法を提供する。【解決手段】蓄電デバイスは、電極体と、外装体とを備える。外装体は、電極体を封止する。外装体は、フィルム状の外装部材によって構成されている。外装体は、電極体に巻き付けられた状態で互いに向き合う面同士が接合することによって封止された第１封止部を含む。第１面の面積は、第２面の面積よりも大きい。第１封止部は、平面視において、第１面と重なっていない。外装部材は、少なくとも、基材層、バリア層、及び、熱融着性樹脂層をこの順に備える積層体から構成されている。バリア層は、Ｆｅ：０．２質量％以上２．０質量％以下、Ｍｇ：０．１質量％以上５．０質量％以下の組成を満たすアルミニウム合金箔を含む。【選択図】図１