| 摘要 |
There is provided a battery system including a battery having a luminescent layer on surfaces of an exterior member [thereof], the luminescent layer containing a stress luminescent material that emits light in response to application of mechanical stress, a photodetector device that detects light emission by the stress luminescent material, and abnormality detection means for monitoring the light emission detected by the photodetector device and thus detecting an abnormality in the battery.
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