BATTERY SYSTEM

• Main Authors: SASAKI TSUYOSHI, KAIYA HIROYUKI, HIROTA YASUKI, SAWADA HIROSHI, KOGA TATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 12.01.2016
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To solve such a problem of a negative electrode active material layer that there is a place where lithium is precipitated easily, and thereby it is required to estimate the lithium precipitation amount while taking account of this point.SOLUTION: A negative electrode active material layer (12b) has a facing portion (G1) facing a positive electrode active material layer (13b), and a non-facing portion (G2) not facing the positive electrode active material layer. The negative electrode active material layer is divided into a first region (H1) including the boundary of the facing portion and non-facing portion, and a second region (H2) including only the facing portion, and different from the first region. Based on the negative electrode potential at the boundary, the lithium precipitation amount in the first region is calculated. Based on the negative electrode potential when assumed that the reaction current in the second region is constant, the lithium precipitation amount in the second region is calculated. 【課題】 負極活物質層には、リチウムが析出しやすい場所があるため、この点を考慮してリチウム析出量を推定する必要がある。【解決手段】 負極活物質層（１２ｂ）は、正極活物質層（１３ｂ）と対向する対向部（Ｇ１）と、正極活物質層と対向しない非対向部（Ｇ２）とを有する。負極活物質層を、対向部および非対向部の境界を含む第１領域（Ｈ１）と、対向部だけを含み、第１領域とは異なる第２領域（Ｈ２）とに分ける。境界の負極電位に基づいて、第１領域におけるリチウム析出量を算出する。第２領域内の反応電流が一定と仮定したときの負極電位に基づいて、第２領域におけるリチウム析出量を算出する。【選択図】 図５