ELECTRODE, ELECTRODE GROUP, SECONDARY BATTERY, BATTERY PACK, AND VEHICLE

• Main Authors: HARADA YASUHIRO, MURATA YOSHIAKI, TAKAMI NORIO, YOSHIDA YORIJI, FUKAYA TARO, YAMASHITA YASUNOBU
• Format: Patent
• Language: English; Japanese
• Published: 27.03.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide: an electrode and an electrode group that can realize a secondary battery with excellent electrolyte penetration into electrodes and retention at electrodes and excellent lifetime performance; a secondary battery and a battery pack with excellent electrolyte penetration into electrodes and retention at electrodes and excellent lifetime performance; and a vehicle equipped with such a battery pack.SOLUTION: According to an embodiment, an electrode 10 is provided including an active material-containing layer 10b and a current collector 10a. The active material-containing layer contains electrode active material, and includes a first side and a second side on an opposite side in a first direction that intersects the first side. The current collector includes an active material carrying portion 10d carrying the active material-containing layer, and an active material non-carrying portion 10e that is adjacent to the active material carrying portion and the first side and is not provided with the active material-containing layer. The electrode has an uneven portion including a plurality of ridges 8 and a plurality of grooves 9, each provided along the first direction. A first pitch a of the uneven portions along the first side and a second pitch b of the uneven portions along the second side satisfy a relationship of a<b.SELECTED DRAWING: Figure 1 【課題】電解質の電極への浸透性および電極における保持性に優れ、且つ、寿命性能に優れた二次電池を実現できる電極および電極群、電解質の電極への浸透性および電極における保持性に優れ、且つ、寿命性能に優れた二次電池および電池パック、及びこの電池パックを搭載した車両を提供する。【解決手段】実施形態によれば、活物質含有層１０ｂと集電体１０ａとを具備する電極１０が提供される。活物質含有層は、第１辺と第１辺と交差する第１方向の反対側にある第２辺とを含み、且つ、電極活物質を含有する。集電体は、活物質含有層を担持している活物質担持部１０ｄと、活物質担持部および第１辺と隣接し且つ活物質含有層が設けられていない活物質非担持部１０ｅとを含む。電極は、第１方向にそれぞれ沿う複数の隆線８と複数の溝９とを含む凹凸部を有する。第１辺に沿った凹凸部の第１ピッチａと第２辺に沿った凹凸部の第２ピッチｂとは、ａ＜ｂの関係を満たす。【選択図】図１