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This paper designs a robotic system based on electric passenger car battery quick-change, in order to meet the development of the domestic electric car. The robot consists of X, Y, Z three freedoms and the R-axis freedom which can adjust the battery angle relative to vehicle chassis. In this paper, we design the robot motion control system by Siemens S7-300PLC, use of robot path planning, multi-axis motion control technology and multi-sensor technology to adjust the position of the battery, take place, angle correction relative to vehicle chassis and installation, make the electric vehicles energy supply more efficient.