Lithium battery pole piece size detection device

The utility model provides a lithium battery pole piece size detection device which comprises an imaging system, a light source system and a control system. The imaging system is used for collecting a to-be-detected cell small unit image; the light source system is used for providing lighting sources for the imaging system; the control system is in communication connection with the imaging system and is used for receiving the to-be-detected cell small unit image; performing corresponding processing analysis on the to-be-detected cell small unit image according to different detection items, and judging whether the size of the to-be-detected cell small unit image is unqualified or not; the control system is in communication connection with the light source system and used for controlling on-off of the light source system. When the light source system irradiates the cell small unit to be detected, the positive plate to be detected is located on the illumination surface of the light source system, the negative pl