Terminal forming machine and method for pole piece of lithium battery

Abstract

The invention discloses a terminal forming machine and method for a pole piece of a lithium battery. The terminal forming machine comprises an unwinding component (2), a cutting base plate (20), a laser cutting head (9), a winding component (18) and a control system, wherein the cutting base plate (20) is placed on a pole piece motion path between the unwinding component (2) and the winding component (18), the laser cutting head (9) is arranged over the cutting base plate (20), and the control system is connected with the unwinding component (2), the laser cutting head (9) and the winding component (18) through signals. The terminal forming machine and method have the advantages that the pole producing process quality is remarkably improved, the consistency of a battery cell is guaranteed, the pole producing efficiency is improved, and subsequent handling of the pole producing process is facilitated.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a tab forming machine and a tab forming method for lithium battery pole pieces. Background technique [0002] In the manufacturing process of lithium-ion batteries (especially large-capacity lithium-ion batteries), there are usually two ways to make pole pieces: one way is to use ultrasonic welding technology to weld the pole piece before the battery core is wound. The independent nickel strip lugs are welded on the pole pieces. In this way, the lugs and pole pieces are connected by solder joints. On the one hand, the resistance of the welding place is relatively large, which affects the charging and discharging quality of the battery. On the other hand, if the quality of the ultrasonic welding process is not good Stable or unbalanced speeds of pole piece incoming material and nickel belt material may easily cause problems such as poor welding of tabs, slow production speed, an...

AI Technical Summary

Problems solved by technology

[0002] In the manufacturing process of lithium-ion batteries (especially large-capacity lithium-ion batteries), there are usually two ways to make pole pieces: one way is to use ultrasonic welding technology to weld the pole piece before the battery core is wound. The independent nickel strip lugs are welded on the pole pieces. In this way, the lugs and pole pieces are connected by solder joints. On the one hand, the resistance of the welding place is relatively large, which affects the charging and discharging quality of the battery. On the other hand, if the quality of the ultrasonic welding process is not good Stable or unbalanced speed of pole piece incoming material and nickel belt material, which may easily cause problems such as poor welding of tabs, slow production speed, and low pass rate

The second method is to cut and form tabs on the pole pieces by die cutting and metal die cutting before the Z-shaped laminations are used to make batteries. This method avoids the high resistance of the connection between the tabs and the pole pieces. However, die cutting is likely to cause quality problems such as large burrs and easy powder loss, resulting in low pass rate. At the same time, this method also has problems such as slow production speed and short die life.

[0003] It can be seen that the existing pole piece production methods and equipment need to be improved urgently

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