What are the welding methods for the connection pieces of new energy vehicle battery modules? (2)
Welding method for connecting power battery modules
The connection method between the single cell of the power battery and the module busbar not only affects the manufacturing efficiency of the power battery, but also determines whether the production of the power battery can be automated. It also has an undeniable impact on the performance of the power battery module assembly vehicle.
The welding methods applied to the connection of power battery modules mainly include:
1. Resistance welding
Resistance welding is a welding method that uses resistance heat as energy. Resistance welding is the process of using the resistance thermal effect generated by the current flowing through the contact surface and adjacent areas of a workpiece to heat it to a molten or plastic state, while applying pressure to form a metal bond.
Resistance welding does not require filler metal, has high productivity, minimal deformation of the welded parts, and is easy to automate. To prevent electric arcs and forged welding metal on the contact surface, pressure should always be applied during welding. In the process of resistance welding, the contact surface of the workpiece to be welded is crucial for achieving stable welding quality. Therefore, before welding, it is necessary to clean the contact surface between the electrode and the workpiece, as well as between the workpiece.
In the grouping process of power batteries, resistance welding is a relatively mature process, applied to the welding of power battery connection pieces and busbars, as well as the connection of power battery poles and parallel conductive bars.
Due to its simple equipment and low cost, it has been widely used in the early development of the power battery industry. In recent years, it has gradually been replaced by more advanced laser welding and polymer diffusion welding.
2. Laser welding
Laser welding has high efficiency and is easy to achieve automated production. With the continuous improvement of welding processes and the limitation of thermal effects during the forming process, laser welding is increasingly being applied in practical production. With the cooperation of industrial robots, laser welding is gradually becoming the main force in automated power battery module production lines.
Laser welding is an efficient and precise welding method that uses a high-energy density laser beam as a heat source. Laser welding is mainly used for welding thin-walled materials and low-speed welding. The laser welding process belongs to the heat conduction type, that is, the laser radiation heats the surface of the workpiece, and the surface heat diffuses internally through heat conduction. By controlling parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted, forming a specific molten pool.
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