Pole piece of super capacitor or lithium battery cell

Abstract

The invention provides a pole piece of a super capacitor or a lithium battery cell. One end of the pole piece is a pasted part, and the other end is a blank part; the pasted part is provided with 4 or 2 corners according to different widths of the blank part; the corners are fillets; and the arc radius of the corners is 5-10% of the long side of the pasted part of the pole piece. The pole piece is used for manufacturing a super capacitor or a lithium battery cell; in a lamination process, the phenomena of powder drop, up-turning and even membrane puncture are avoided at the corners, thereby ensuring the manufacturing quality and service life of the cell, improving the yield and lowering the production cost; and moreover, the pole piece can meet the design requirement of leading out lugs from one end or both ends of the cell, and the application range is widened.

Description

technical field [0001] The invention relates to a pole piece of a supercapacitor and a lithium battery cell, which is used for making laminated cells. Background technique [0002] With the rapid development of new energy electric vehicles, especially the application of lithium batteries and hybrid batteries in electric bicycles and electric vehicles, the safety and cycle performance of batteries have become more and more bottlenecks in the development of new energy vehicles. In the manufacturing process of power batteries, there are mainly laminated batteries and wound batteries. Compared with winding batteries, laminated batteries have better safety. During the charging and discharging process, the internal temperature distribution is relatively uniform, there is no internal stress and the internal resistance is relatively small. From the design point of view, the probability of abnormalities is greatly reduced, and the safety is guaranteed. Great improvement, due to the ...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the structure of its industrial automation equipment-automatic stacking machine is relatively complicated, each type of battery cell corresponds to a set of molds, and the replacement of molds is also complicated and difficult to operate, so the general manufacturer buys back a stacking machine Only one type of battery cell is produced, and the mold is no longer replaced

The automatic stacking machine is expensive, and not all batteries can be used with the automatic stacking machine. Manufacturers often choose to use semi-automatic manual stacking for batteries with a small output or unstable output. In the process of manual lamination, the workers are in direct contact with the pole pieces. The cut pole pieces are rectangular and the corners are right angles. The raised corner pierces the diaphragm, causing a short circuit between the positive and negative poles, affecting the quality and service life of the battery cell, and increasing the defect rate, rework rate and scrap rate in the production process

Images