DIY Spot Welder Control Board 12VAC For 18650 Battery Welding
The DIY Spot Welder Control Board 12VAC is a specialized electronic module engineered for enthusiasts and technicians building custom battery spot welding machines. Designed specifically for assembling 18650 and other lithium-ion battery packs, this controller acts as the logic center for your welding setup. It provides precise regulation of the weld pulse, ensuring consistent and reliable connections between nickel strips and battery terminals without damaging the cells.
Features:
- Enables precise control over spot welding time and current intensity for professional-grade battery assembly.
- Utilizes zero-crossing detection circuits to ensure accurate phase shifting and consistent weld quality.
- Features optocoupler isolation to separate weak logic currents from high-voltage switching components.
- Equipped with dual potentiometers for easy, tool-free adjustment of welding parameters.
- Includes a dedicated connector for a foot pedal or limit switch trigger mechanism.
- Designed with Buzzer to provide visual feedback on power status and operation.
- Compatible with standard AC transformers for logic power (requires 12V AC input).
- Overcurrent Protection Enhances safety by preventing damage from excessive current flow.
Specifications:
| Parameter | Value |
|---|---|
| Operating Voltage: | 12VAC |
| Supported Battery Types: | 18650 and other cylindrical lithium-ion cells |
| Pulse Duration Range: | 1–100 milliseconds (adjustable) |
| Switching Components: | High-power MOSFETs |
| Welding Trigger: | Manual button |
| PCB Dimensions (L × W): | 67mm × 50mm |
| Cooling: | Passive |
| Protection Features: | Overcurrent and undervoltage protection |
Connections:
Configuration:
| Label on Board | Wire Connection | Safety & Function |
| Input terminal | Small AC Transformer (12V) | Logic Power: Powers the buzzer, LEDs, and processor. |
| SW | Manual Button / Limit Switch | Trigger: Connect your switch here. No polarity (either wire to either pin). |
| L | AC Mains Live (220V/110V) | Power Input: The “Hot” wire from your wall plug enters here. |
| T1 | Big Transformer (MOT) Primary | Power Output: The “Switched” wire that goes to your welding transformer. |
Applications:
- DIY Battery Pack Assembly.
- Battery Repair Projects.
- Electronics Prototyping.
- Small-Scale Manufacturing.
- Educational Use
- Backup Power Systems.
- Recycling and Reusing Batteries.
Package Contents:
- 1x DIY Spot Welder Control Board 12VAC For 18650 Battery Welding