| 摘要 |
Provided is a secondary battery system adapted to immediately detect that a lithium-ion secondary battery has entered a region in which the battery deteriorates in accordance with the t-law. The lithium-ion secondary battery system includes: a lithium-ion secondary battery; an acoustic emission (AE) sensor that detects an AE signal occurred in the lithium-ion secondary battery; an AE signal detector that detects the AE signal sent from the AE sensor; and a controller to which a signal from the AE signal detector is input. When a count of AE events which occur in a low-voltage region of one charge/discharge cycle of the lithium-ion secondary battery equals or exceeds a threshold value, the controller outputs a signal denoting a start of the deterioration of the lithium-ion secondary battery. |
