Battery Pouch Folding for Deep Electrode Assembly Accommodation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing pouch manufacturing methods for secondary batteries face limitations in forming depth due to stretching and damage of the pouch material, which hinders the accommodation of high-stack electrode assemblies.
Innovation Solution
A pouch manufacturing method involving a seating, support, and folding process using jigs to form a receiving portion in the pouch sheet, accompanied by thermal fusion to prevent unraveling and maintain shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the molding depth is increased to accommodate high-stack electrode assemblies, then the energy density and number of stacks increase, but the pouch material becomes stretched, damaged and broken
Solution Approach 1:
The forming process is divided into multiple stages: initial forming at a first depth, followed by additional forming at a second depth greater than the first depth. This segmentation allows the pouch material to gradually accommodate deeper electrode assemblies without excessive stretching or damage at any single stage.
Solution Approach 2:
The pouch is pre-formed to an initial depth before the electrode assembly is fully inserted. This preliminary forming creates a receiving portion that gradually accommodates the electrode assembly, preventing material failure that would occur with single-stage deep forming.
2Ease of manufacture
If the pouch is pressed with a punch to form the receiving portion, then the pouch is stretched and damaged, but this limits the molding depth
Solution Approach 1:
The forming process uses dynamic control of the punch movement, applying pressure in stages rather than as a single force. The punch first forms the pouch to an initial depth, then subsequently forms it to a greater second depth, allowing the material to adapt progressively without failure.
Solution Approach 2:
The forming operation is performed periodically in two distinct stages: first forming to a shallower depth, then second forming to a greater depth. This periodic action allows the pouch material to recover and strengthen between forming stages, enabling greater ultimate depth.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the formation of a receiving portion without depth limitations, allowing for high-stack electrode assemblies to be accommodated without stretching, thereby facilitating the production of high-stack secondary batteries.
Implementation Method 1
folding the pouch sheet seated on the seating jig to form a receiving portion in which the electrode assembly is accommodated
Implementation Method 2
pressing and supporting the pouch sheet through a support jig located on the opposite side with the pouch sheet interposed therebetween
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to a pouch manufacturing method and a pouch manufacturing device, and the pouch manufacturing method according to the present disclosure includes a seating process of seating a pouch sheet on a seating jig; a support process of pressing and supporting the pouch sheet through a support jig located on the opposite side with the pouch sheet interposed therebetween with respect to the seating jig; and a folding process of securing the pouch sheet through the seating jig and the support jig in the support process, and then moving a plurality of folding jigs and folding the pouch sheet seated on the seating jig to form a receiving portion in which the electrode assembly is accommodated.