12V DIY Portable Spot Welding Machine PCB Circuit Board For Li-ion and LiFePO4 batteries

This spot welding machine circuit board is a high-current electronic control module designed for DIY and compact battery spot welding applications. It uses multiple parallel MOSFETs to deliver short, powerful current pulses required for welding nickel strips to lithium battery cells. The board is commonly used in handheld or bench-top battery pack spot welders.

Technical Specifications:

• Input voltage: DC 12 V (battery powered)
• Input current: High pulse current (hundreds of amps, depending on battery capability)
• Output type: Pulsed DC for spot welding
• Switching devices: High-power MOSFET array (parallel configuration)
• Control method: Push-button trigger / external control pads
• Capacitors: High-value electrolytic for pulse stabilization
• Connections: IN+ / IN− (battery input), OUT+ / OUT− (welding electrodes)
• Mounting: PCB mounting holes
• Cooling: Passive (MOSFET heat dissipation via PCB and airflow)

Features:

• High current capability suitable for battery tab welding
• Multiple MOSFETs in parallel for low resistance and high efficiency
• Compact and lightweight design for portable spot welders
• Fast pulse response for clean, precise welds
• Supports copper welding probes and thick power cables
• Simple wiring and easy integration into DIY projects
• Designed for short-duration pulses to minimize battery stress

Applications:

• Lithium-ion battery pack assembly (18650, 21700, 26650 cells)
• Nickel strip spot welding
• DIY battery welder projects
• Repair and rebuilding of rechargeable battery packs
• Educational and experimental high-current electronics projects