Two-string supercapacitor spot welding machine

This is the second time I've made a spot welder for two strings of supercapacitors. The results are better than the first time. The test used 0.2mm nickel steel strip stacked with 0.1mm copper strip, and the effect was acceptable; as long as it works, it's fine. The main controller is a PY32F030F28P6, which accurately measures the voltage of each capacitor string. The second capacitor string is measured using a differential amplifier circuit, and a BW6101 is used for voltage clamping (passive balancing). A thermistor and cooling fan are used to dissipate heat from the clamping circuit. Automatic triggering and limit switch triggering both work. The display can be a 12864 OLED; just modify the pins and initialization program to simulate SPI. Charging is done using a power chip connected in series with a cement resistor.
I had many complaints about the passive balancing. Later, I tested the "Three-String Active Balancing Mini Version" open-source project, which seemed very useful; I might modify it later.
Test video link: [QQ Short Video] DIY enthusiast Luo's work https://s.xsj.qq.com/NatO1nlk Click the link to view directly
[VID_20241010_175825-Bilibili] https://b23.tv/CFmWNxB