POWER STORAGE ELEMENT

• Main Authors: KAKO TOMONORI, KAMIHIRA KENTA, HARINAGA UKYO, NAKAI KENTA, TAKASAKI MASAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 18.03.2021
• 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 element having a plurality of winding type electrode bodies, and having the improved energy density.SOLUTION: A power storage element includes a plurality of electrode bodies wound with an electrode 20 having conductive layers 211, 2311, and 2411 and active material layers 232 and 242 superposed on the conductive layers, and a case in which the plurality of adjacent electrode bodies are housed side by side and in close contact with each other, and the outermost peripheral portion of the electrode in at least one of the adjacent electrode bodies has an outer unformed portion 213 having no active material layer on the outer surface of the conductive layer, and the outer unformed portion is located in an area in close contact with at least an adjacent electrode body.SELECTED DRAWING: Figure 6 【課題】複数の巻回型の電極体を有する蓄電素子であって、エネルギー密度を向上させた蓄電素子を提供する。【解決手段】導電層２１１、２３１１、２４１１と該導電層に重ねられる活物質層２３２，２４２とを有する電極２０が巻回された複数の電極体と、複数の電極体を並んだ状態で且つ隣り合う電極体同士を密接させた状態で収容しているケースと、を備え、隣り合う電極体のうちの少なくとも一方の電極体における電極の最外周部位は、導電層の外側面上に活物質層のない外側未形成部２１３を有し、外側未形成部は、少なくとも隣の電極体と密接する領域に配置されている蓄電素子。【選択図】図６