Portable spot welder

A portable spot welder, comprising:

• a control board, a logic chip being arranged on the control board;
• a battery, the battery being electrically connected to the control board;
• an analog-to-digital converter (ADC) detection module, the ADC detection module being electrically connected to the control board;
• a light emitting diode (LED) module, the LED module being electrically connected to the control board;
• a key module, the key module being electrically connected to the control board;
• a power metal oxide semiconductor (MOS) module, the power MOS module being electrically connected to the battery, and being used for adjusting output power;
• an optical-coupler isolation driving module, the optical-coupler isolation driving module being electrically connected to the power MOS module and the control board;
• a battery protection module, the battery protection module being electrically connected to the battery and the control board, and being used for performing overcharge, overdischarge, overcurrent and short-circuit protection on the battery;
• a power supply module, the power supply module being electrically connected to the battery protection module and the control board, and being provided with a charging interface and a discharging interface;
• and
• a soldering iron module, the soldering iron module being electrically connected to the battery protection module, and being provided with spot welding pen interfaces, wherein
• the ADC detection module is used for detecting the battery, the power supply module and the soldering iron module and feeding data back to the control board.