Alarm device for locking failure of power battery boxes, as well as alarm method for locking failure of power battery boxes

The invention discloses an alarm device for the locking failure of power battery boxes, as well as an alarm method for the locking failure of the power battery boxes. The alarm device for the locking failure of the power battery boxes includes a box body, a display panel and an alarm circuit. The alarm method for the locking failure of the power battery boxes includes the following steps: when one power battery box is effectively locked, a corresponding switch K1 is disconnected, current passes through a second pin and a third pin of a corresponding RGB (red, glue, and blue) LED D1, and the corresponding RGB LED gives out green light; when locking of a certain power battery box fails, the corresponding switch K1 is connected, current passes through a first pin and the third pin of the corresponding RGB LED D1 as well as the second pin and the third pin of the corresponding RGB LED D1 simultaneously, the light color changes from green to orange, a buzzer is connected to work at the same time, and the battery box with the locking failure is rapidly judged according to a mark number of the glowing RGB LED on the display panel. The position of the power battery box with the locking failure can be rapidly judged according to the mark number; the invention has the advantages of simple circuit structure, easiness in implementation, as well as high reliability and practicality.