Soft packed battery tab welding method

Abstract

The invention discloses a soft packed battery tab welding method and provides a soft packed battery tab welding manner, which can improve the energy density of a soft packed battery and improve the manufacturing efficiency of the soft packed batteries. The method comprises the following steps: firstly, carrying out ultrasonic pre-welding to an incoming battery cell; bending an adhesive tab welding end for 90 degrees, and then ultrasonically welding the adhesive tab welding end to an exposed battery cell foil material pre-welded in the step a; cutting adhesive tabs and the battery cell foil material together; finally, bending a welding zone to a side surface of the battery cell for 90 degrees so as to enable the adhesive tabs to be parallel to the battery cell, and keeping the two adhesive tabs to be parallel. According to the tab welding method, the adhesive tabs are bent and deformed in advance, then welding and cutting are performed, the automation is easy to realize, foil material is prevented from being broken by tearing, the process is reasonable, and high-energy density and high production efficiency are achieved.

Description

technical field [0001] The invention relates to a welding process for tabs of soft-packaged batteries. Background technique [0002] Flexible packaging lithium-ion batteries have the characteristics of simple structure, changeable shape, and high energy density. The application fields are becoming more and more extensive, and the demand is also increasing. With the continuous development of flexible packaging lithium-ion batteries, people are more concerned about the energy density of flexible packaging batteries Higher requirements are put forward, not only in the field of small electronic products, but also in the field of power and other fields. The energy density of larger soft-pack batteries also puts forward strict requirements, which prompts people to continue in-depth research on materials, processes, and soft-pack battery structures. , to increase the energy density of flexible packaging batteries. [0003] The welding structure of flexible packaging batter...

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Problems solved by technology

However, this welding method makes the welding position occupy a certain amount of battery space, increases the volume of the battery, and reduces the volume specific energy of the battery.

[0004] At present, there are usually two welding methods, one is cladding welding, and the other is flat welding and then bending. As we all know, the cladding welding process is complicated and the degree of automation is low. Equipment with a slightly higher degree of automation usually does not use this method. Production of power type flexible packaging batteries; flat welding and then bending are usually carried out on the basis of flat welding to bend the tabs. First, the flexible packaging batteries are flat-welded and then bent. A certain pulling force can easily deform or tear the foil, so it is difficult to realize it in equipment with a high degree of automation.

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