The battery spot welder uses resistance welding to weld the cell-to-cell busbar to the battery cell pole surface. In order to ensure stable spot welding results, we need to ask ourselves a question: How does a battery spot welder work?

The spot welding process of the battery spot welder is generally divided into 4 basic stages:

1) Pre-pressurization stage: The spot welding pins of the battery spot welder press the battery tabs down against the battery cell pole to eliminate the gap between them.

2) Spot welding stage: The welding power supply outputs welding current, and the resistance heat welds the battery tabs onto the battery cell pole.

3) Hold stage: The welding pins are kept pressed down to hold the compression pressure between the battery tabs and the battery cell poles.

4) Resting stage: the downward pressure is removed and the welding pins rise.

Figure1. Automatic Battery Spot Welder

If, according to whether the welding current is output, what are the 3 stages of spot welding?

1) Pre-pressurization stage: The welding pins of the battery spot welder press the battery tabs down against the battery cell pole to eliminate the gap between them.

2) Spot welding stage: The welding power supply outputs welding current, and the resistance heat welds the battery tabs onto the battery cell pole.

3) Cooling stage: The welding power supply stops outputting welding current and the battery

tabs cool down.

From the above, we can know that the battery spot welder works like this: the spot welding head is pressed down and the battery tabs are pressed tightly onto the battery pole with welding pins. Then, during the welding process, hold the pressure between the battery tabs and the battery cell pole to ensure good contact between the two. The battery spot welding power supply outputs welding current, and the resistance heat welds the battery tabs to the battery cell pole. The battery spot welding head is lifted and the battery spot welding process is completed.

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