Method for improving strength of pole piece of square lithium ion battery after Mark hole drilling

Abstract

The invention provides a method for improving the strength of a pole piece of a square lithium ion battery after Mark hole drilling, and relates to the technical field of electric power. The inventiondiscloses a method for improving the strength of a pole piece of a square lithium ion battery after Mark hole drilling. The method comprises the following steps: S1, drawing a cutting pattern row ofthe lithium ion battery for punching Mark holes in two sides, and arranging circular grooves of the Mark holes on the edges of tabs (the pattern row of the Mark holes is drawn by adopting laser drawing software when the punching pattern row of the Mark holes is drawn); and S6, removing waste generated in the machining process in time, so that the waste is prevented from being sucked into the punched position, and machining deviation is avoided. Program parameters can be adjusted through the steps of S2, S3 and the like, the punching mode of the parallel positions of the two sides of the pole piece is changed into the two-side staggered punching mode, the lower limit of specific optimization may have a certain difference, and the higher the tensile strength of the pole piece depends on theMark hole size recognition capacity of a winding machine, therefore, it can be seen that the purpose of preventing strip breakage during Mark hole punching can be achieved.

Description

technical field [0001] The invention relates to the technical field of marking holes for lithium-ion batteries, in particular to a method for improving the strength of pole pieces after marking holes for square-shaped lithium-ion batteries. Background technique [0002] In recent years, the new energy industry has developed rapidly. As a clean and efficient new energy source, lithium-ion power batteries are widely used in vehicles such as automobiles due to their high operating voltage, large specific energy, long cycle life, and no pollution. , ships, forklifts and energy storage and other industries, among which prismatic lithium-ion batteries are a very important and common type. [0003] The structure of this type of battery is mainly composed of a cover plate, an aluminum shell, an internal winding core and auxiliary parts, etc., in which the winding core is mainly composed of positive and negative pole pieces and a diaphragm in a certain order, and then combined with t...

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Problems solved by technology

[0004] However, the winding type has higher requirements on the strength and uniformity of the pole piece. Otherwise, the risk of tape breakage will easily occur during the manufacturing process. After the tape breaks, it is very troublesome and time-consuming, which seriously affects the production efficiency. In fact, the current conventional The tensile strength of the positive aluminum foil and the negative copper foil can basically meet the tensile requirements of the winding equipment, but in the continuous winding production process, in order to separate the pole pieces of the front and rear cores, the pole pieces will be intermittently stamped. Cutting identification hole, also known as Mark hole, this position becomes the weakest point of the whole pole piece, and it is also the frequent point of broken belt. Therefore, to solve this problem, we can design a kind of The method of pole piece strength with broken band

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