Hello. I need help choosing the right controller for the Li-ion battery welder. I built a welder from a microwave transformer. Works great. I decided to make the control so as not to overheat the plates and batteries for too long. I bought such a module on aliexpress (for $ 0.95) with a relay as shown in the attached picture. 
This entire module with a relay controls a larger contactor that switches on a converted microwave transformer. From the button on the module, I led the cable to the second button which I press with my foot as soon as I press the tips of the electrodes to the plate on the battery. I set the relay operation time with the potentiometer on the module for 1 second. And here a little problem begins and I am asking for help. The purchased module works on the principle that I press the button and release, and the relay keeps the contacts closed for the time set on the module (in my case, 1 second). However, the problem is that if I hold down the button for too long (the plates are burning) because this module starts counting the time until the relay is disconnected only after releasing the button. Maybe someone knows what model of the module to buy on e-bay or aliexpress, or Allegro, which will turn on and off the relay when the button is pressed, regardless of whether I hold the actuation button or not. Only releasing and pressing the button again should restart the relay. I hope I explained my problem well. I am not able to deduce from these Chinese descriptions which module will work like that. Alternatively, I am asking for a small diagram of how to convert this module that I already have (maybe add something to it). Finally, in one sentence: I am looking for a module with adjustable relay activation time from 0 to 10 or more seconds, with a button that activates it, and the relay releases the contacts, regardless of whether I hold the button down or not, after a set time. The next switching on is to take place after releasing and pressing the button again. This way, I will avoid accidentally welding for too long. I know that I wrote a lot, but I wanted to explain the problem well. Please help. Greetings.
This entire module with a relay controls a larger contactor that switches on a converted microwave transformer. From the button on the module, I led the cable to the second button which I press with my foot as soon as I press the tips of the electrodes to the plate on the battery. I set the relay operation time with the potentiometer on the module for 1 second. And here a little problem begins and I am asking for help. The purchased module works on the principle that I press the button and release, and the relay keeps the contacts closed for the time set on the module (in my case, 1 second). However, the problem is that if I hold down the button for too long (the plates are burning) because this module starts counting the time until the relay is disconnected only after releasing the button. Maybe someone knows what model of the module to buy on e-bay or aliexpress, or Allegro, which will turn on and off the relay when the button is pressed, regardless of whether I hold the actuation button or not. Only releasing and pressing the button again should restart the relay. I hope I explained my problem well. I am not able to deduce from these Chinese descriptions which module will work like that. Alternatively, I am asking for a small diagram of how to convert this module that I already have (maybe add something to it). Finally, in one sentence: I am looking for a module with adjustable relay activation time from 0 to 10 or more seconds, with a button that activates it, and the relay releases the contacts, regardless of whether I hold the button down or not, after a set time. The next switching on is to take place after releasing and pressing the button again. This way, I will avoid accidentally welding for too long. I know that I wrote a lot, but I wanted to explain the problem well. Please help. Greetings.
