发明名称 |
DEGRADATION DETERMINATION DEVICE AND DEGRADATION DETERMINATION METHOD FOR LITHIUM ION SECONDARY BATTERY |
摘要 |
A degradation determination device includes: a measuring unit measuring an open-circuit voltage characteristic indicating an open-circuit voltage variation with respect to a lithium ion secondary battery capacity variation; and a determining unit determining a degradation state due to wear and precipitation of lithium using a parameter for identifying the open-circuit voltage characteristic that substantially coincides with the measured open-circuit voltage characteristic. The parameter includes single electrode capacity retention rates expressed by the expressions (I) positive electrode capacity retention rate=degraded positive electrode capacity/initial positive electrode capacity and (II) negative electrode capacity retention rate=degraded negative electrode capacity/initial negative electrode capacity, and a battery capacity variation expressed by the expression (III) battery capacity variation=degraded negative electrode capacity×shift of a negative electrode composition axis with respect to a positive electrode composition axis. |
申请公布号 |
EP2559095(B1) |
申请公布日期 |
2014.07.02 |
申请号 |
EP20110728384 |
申请日期 |
2011.04.12 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
TAKAHASHI, KENJI;NISHI, YUJI;TOMURA, SHUJI;HAGA, NOBUYASU;FUCHIMOTO, TETSUYA |
分类号 |
H01M10/48;G01R31/36;H01M10/0525 |
主分类号 |
H01M10/48 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|