Battery Pouch Cold Forming to Prevent Curl Interference
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Solution Overview
Problem
The formation of pouches for secondary batteries often results in curls due to differences in elongation rates between layers, leading to equipment interference and increased costs for high-speed production lines, and existing methods fail to effectively prevent or reduce these curls.
Innovation Solution
A method involving a curling process to bend the pouch sheet in a round shape, followed by seating it on a lower mold with a molding groove and pressing it using a punch mold to form an accommodation part, optionally with a vacuum adsorption process to prevent curls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotary die punch is used to form pouches from a single large sheet of aluminum foil, then manufacturing efficiency is improved, but the aluminum foil must be heated to a high temperature which causes degradation of the foil and necessitates frequent replacement of the heating element
Solution Approach 1:
The invention changes the temperature parameter from high temperature (conventional heating) to room temperature by substituting thermal energy with mechanical energy through cold forming operations. This eliminates thermal degradation of aluminum foil and removes the need for high-temperature heating elements while maintaining pouch formation capability
Solution Approach 2:
The invention replaces the thermal system (heating element) with a mechanical system (cold forming die and punch assembly). The mechanical force directly deforms the aluminum foil at room temperature to create pouches, eliminating the need for thermal energy and high-temperature heating components
2Stability of the object's composition
If conventional heating methods are used to form pouches, then the aluminum foil becomes pliable enough to form, but the high temperature degrades the foil quality and requires frequent heating element replacement
Solution Approach 1:
The invention changes the temperature parameter from elevated temperature to room temperature by applying mechanical pressure instead of thermal energy. The aluminum foil achieves the necessary deformation at room temperature through controlled mechanical force, eliminating thermal degradation while maintaining formability
Solution Approach 2:
The invention applies preliminary mechanical force through the die and punch assembly to pre-deform the aluminum foil into the desired pouch shape at room temperature. This preliminary mechanical action replaces the need for thermal softening, allowing direct formation without heating
Data Source
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AI summary
The present invention relates to a method for forming a pouch, and the method for forming the pouch according to the present invention comprises: a curling process of bending a pouch sheet in a round shape; a seating process of seating the bent pouch sheet on a lower mold, in which a molding groove is formed; and a forming process of pressing the pouch sheet by using a punch mold to form an accommodation part, in which an electrode assembly is accommodated, in the pouch sheet.