Toyota Jidosha Kabushiki Kaisha

Ruri Hara

Toshinori Okura

Yamato Saito

Toshiya Arakawa

The battery inspection method includes the following. Self-discharging the battery to be inspected until a predetermined time elapses from the start of self-discharging. Detecting a voltage, a current, a temperature of the battery and an ambient temperature when the predetermined time elapses. Perform a preliminary step prior to self-discharge of the battery. Obtain preliminary step information representing the execution conditions of the preliminary step. Calculating the current convergence value from the acquired preliminary step information, the detected voltage, current, and temperature, and the detected ambient temperature by referring to a predetermined correspondence between the preliminary step information, the voltage, current, and temperature of the battery at the time when the predetermined time elapses, the ambient temperature, and the current convergence value. Determining whether a short circuit failure of the battery has occurred based on the calculated current convergence value.

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Toyota, Japan

Ruri Hara