Design And Implementation Of Lithium Battery Detection System Based On Air-coupled Ultrasound

Traditional fossil energy causes huge environmental damage,which prompts countries around the world to seek new energy sources to solve this problem.Electric vehicles,as a kind of new energy vehicle,are favored by more and more citizens in the field of public transportation.Lithium batteries,as the fundamental constituent of electric vehicles,exhibit the properties of high specific capacity,high operating voltage,and high cycling stability.However,due to the many components and complex production process of lithium batteries,there is a possibility of explosion in both production and use.This thesis builds a non-contact ultrasonic detection system for lithium-ion batteries to assess their safety performance.The system is based on ultrasonic C-scan technology,and it mainly consists of three subsystems: ultrasonic transmission and reception system,three-axis motion control system and ultrasonic data acquisition and storage system.This thesis introduces the construction process of the subsystems from two aspects: hardware and software.The hardware system uses high-gain ultrasonic amplifier,high-precision motion control platform and high-speed acquisition system.The software system controls the hardware subsystems by the upper computer software,filters the wavelet noise by the improved wavelet transform denoising method,improves the signal resolution,and ensures the image ratio by the image adaptive algorithm.The self-developed system scans various specifications of lithium battery pole ears and lithium batteries,and obtains clear and obvious pseudocolor images of each part to verify the feasibility of the hardware and software system.By analyzing the data and imaging of lithium battery scanning,the specific locations of different types of defects on lithium batteries can be obtained,realizing the fast ultrasonic C-scan defect detection of lithium batteries.