Measurement method for battery welding quality

Specific embodiment

[0026] In this embodiment, the battery adopts an 18650 lithium iron phosphate 1.5Ah/3.2V single battery, and its electrode cap is circular, with a diameter of 12 mm, and a flat surface. The voltage detector is a voltage detection device that receives the signal from the controller and collects the voltage V ad. Specifically, in this embodiment, the high-speed analog-to-digital converter AD9220 of Analog Devices is used to realize signal collection. The highest sampling rate of AD9220 can reach 10 MHz, and an external crystal oscillator of 8 MHz is used, and signal storage is realized by sampling inside the FPGA. The voltage signal of the battery module can be collected and converted into a digital signal for output. The current source adopts ZM20-12ET switching controlled DC constant current power supply, the controlled output current range is 1-10A, the maximum output voltage is limited to 3V, and the current accuracy is 0.2%. It can accept the control signal of the controller to accurately adjust the output current. The controller uses a digital signal processor DSP. Digital signal processor DSP is composed of a large-scale or very large-scale integrated circuit chip, and is used to complete signal processing tasks. In order to realize the fast calculation function, the digital signal processor uses the TMS320F2812DSP application system board. The TMS320F2812DSP application system board has a digital-to-analog converter and an analog-to-digital converter, so it is a preferred signal processing and control device. The display receives the voltage of the voltage detector and the controller and displays it. Specifically, it adopts TPC-150T-ATOM model 15-inch industrial-grade tablet computer, 15-inch true color LCD display, resolution 1024x768, equipped with common industrial control interfaces, and the hard disk adopts a unique anti-vibration design, which can store one year's transmission data for quality management And for statistical analysis. It adopts 6~30V DC power input to meet the anti-interference power supply of industrial scene.