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Welding problems of electronic tab materials

2021-05-18

Regarding the welding of dissimilar materials for soft-package batteries, it mainly includes the series connection of positive and negative electrodes. The tabs are metal conductors in the battery core to lead the positive and negative electrodes. The tabs, commonly known as the positive and negative electrodes of the battery, are the contact points for charging and discharging.Electronic tab materialThe positive and negative materials are different. The positive electrode of the battery uses aluminum (Al) material, the negative electrode uses nickel (Ni) material, and the negative electrode also has copper-plated nickel (Ni-Cu) material. The thickness of the copper tab is usually 0.2-0.5 mm, and the thickness of the aluminum tab is usually 0.2-0.6 mm.


The most difficult point in copper-aluminum welding:

Since the melting point difference between copper and aluminum is large when the liquid is mutually dissolved, and the infinite solid solubility is limited, a variety of intermetallic compounds can be formed as the basis of the solid solution phase. Therefore, when welding, try to choose a light source with good beam quality to reduce heat input and shorten the copper The time in contact with aluminum in the liquid phase to reduce the formation of two intermetallic compounds by increasing the strength of the welded joint.

In the existing soft-packaged lithium ion battery, the welding method between the electrode ears and the positive/negative electrode ears basically adopts the folding welding method, that is, the positive electrode ear and the negative electrode ear are bent after the electrode ear welding is completed. In the structure of a single battery, the existing folding welding method can make more use of the product volume to ensure the size of the battery, but when the tab is subjected to external force, sharp corners are prone to appear during the cutting operation. After the tabs are inserted into the battery, the force may cause bending, resulting in a short circuit inside the battery, thereby reducing the safety and reliability of the battery. Moreover, the operation process is complicated, and the welding and positioning consistency of the tabs is poor, which directly affects the consistency of the product size. Finally, during the series and parallel connection of assembled batteries, this may cause some of the tabs to withstand greater force, which may lead to fatal safety hazards.


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