If you have soldered directly to the battery, even if you know more, please raise your hand. We have all been there. Sometimes, when we have a small bag and don’t care about lifespan, we will get away by chance.But when [Robert Dunn] It takes about 120 lithium-ion batteries to build a battery pack, and he knows that he must do it the right way and use a battery spot welder.Of course, for hackers like hackers, buying one is too easy [Robert]. So he decided Use an old microwave oven and too much mahogany to make a spot welder, you can check it under the lounge area.
For those who are not familiar with it, the battery spot welder is a magical device that connects the tabs to the rechargeable battery. You will notice that all battery packs with cylindrical batteries have a label with two small dimples. These pits are where the high ampere current quickly heats the battery terminals and lugs until they turn red, soldering them together. The operation was completed in less than a second and was completed before any thermal damage. The lug can then be welded or spot welded to another battery.
One of the most critical parts of spot welding batteries is timing.although [Robert Dunn] Acknowledging that the 555 timer can do this work even with manual switches and relays, he chose the Arduino Uno with a 4-character 7-segment LED display, which displays the welding time in milliseconds. A 3D printed trigger and welding machine handle nicely wrap the hardware.
The top of the building is a custom mahogany shell, which is a bit too much. But if one has wood, time, tools and skills (and maybe a YouTube channel?), there is no reason not to put in extra effort! [Robert]The result of the build is almost and also Good, but it will definitely get the job done.
Of course, spot welders are almost standard fees in Hackaday, and we have covered good, bad and solar. Do you have a battery welder project that deserves a place in Hackaday’s rotation? Anyway, send it to the prompt line!