Make shortcut for your bat file in %appdata%\Microsoft\Windows\Start Menu\Programs\Startup
1. open explorer
2. press ctrl + l and type %appdata%\Microsoft\Windows\Start Menu\Programs\Startup and press enter
3. make shortcut

If you need some delay for start, then you can do similar thing via task scheduler with this guide, just don't forget to add folder where to start your bat in actions tab.