BATTERY INSPECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a battery inspection method for accurately inspecting a fault portion due to insufficient impregnation with electrolyte in short time.SOLUTION: Provided is a method of inspecting a battery that includes: an electrode wound body 20 including a positive electrode plate 13, a negative electrode plate 14, and a separator 15 inserted between the positive electrode plate 13 and the negative electrode plate 14; electrolyte 30 held with the separator 15 impregnated with the electrolyte 30; and a battery case 40 holding the electrode wound body 20 with the electrolyte 30 immersed around the electrode wound body 20. A transmitter 60 transmitting an ultrasonic wave and a receiver 70 receiving the ultrasonic wave are arranged from outward of the battery case 40 at respective positions at which the separator 15 is to be impregnated with the electrolyte 30 with the battery case 40 interposed between the transmitter 60 and the receiver 70, and the battery is inspected on the basis of a signal of the ultrasonic wave received by the receiver 70.