Large energy storage spot welding

What is resistance spot welding?

Resistance spot, ultrasonic or laser beam welding are mostly used for connecting battery cells in the production of large battery assemblies. Each of these welding techniques has its own characteristics depending on the material properties and contact geometry. Cell casing and terminal dimensions may constrain possible contact geometries.

What are the advantages of spot welding?

The attractive feature of spot welding is that a large amount of energy can be delivered to the spot in a very short time (approximately 10–100 milliseconds). This permits the welding to occur without excessive heating of the remainder of the sheet.

What is a Micro spot welder?

Micro spot welders, used in a variety of industries, can go down to 1.5 kVA or less for precision welding needs. It is common for a spray of molten metal droplets (sparks) to be ejected from the area of the weld during the process. Resistance spot welding generates no bright arc, so UV protection is not required.

How many weld spots are there?

The measuring point left in the diagram of Fig. 14 shows two weld seams each 13.5 mm long but using superimposed beam oscillation. For resistance spot welding, the number of weld spots was varied from 4 to 8 to 12 weld spots.

How does spot welding work?

Spot welding involves three stages; the first of which involves the electrodes being brought to the surface of the metal and applying a slight amount of pressure. The current from the electrodes is then applied briefly after which the current is removed but the electrodes remain in place for the material to cool.

What equipment is used in spot welding?

The equipment used in the spot welding process consists of tool holders and electrodes. The tool holders function as a mechanism to hold the electrodes firmly in place and also support optional water hoses that cool the electrodes during welding. Tool holding methods include a paddle-type, light duty, universal, and regular offset.