Pouch Forming Device with Opposing Press Modules
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Solution Overview
Problem
Conventional pouch-type secondary battery manufacturing methods suffer from curling phenomena and excessive stretching at the edge portions of the battery cell accommodating part due to uneven stretch rates between the inner and outer surfaces of the pouch film, leading to defects and reduced lifespan.
Innovation Solution
A pouch forming device with a grip module, a first press module, and a second press module is used to minimize curling and excessive stretching by applying pressure in opposite directions, utilizing a first press block with an ellipsoid shape to reduce surface pressure deviation and a second press block to form the battery cell accommodating part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single press module is used to form the battery cell accommodating part, then the manufacturing process is simple, but curling phenomenon and excessive stretching occur at the edge portions
Solution Approach 1:
The single press module is divided into two separate press modules: a first press module that applies pressure from one side and a second press module that applies pressure from the opposite side. This segmentation allows independent control of pressing forces, enabling uniform pressure distribution and preventing curling and excessive stretching at edge portions while maintaining manufacturing precision.
2Productivity
If high pressing force is applied to form the battery cell accommodating part quickly, then productivity increases, but uneven stretch rates cause curling and defects
Solution Approach 1:
The first press module performs preliminary pressing to pre-form the battery cell accommodating part shape, creating initial deformation. Subsequently, the second press module applies counter-pressure to complete the forming process. This preliminary action approach distributes the total deformation across two controlled stages, maintaining uniform stretch rates even at high pressing forces, thereby preventing curling and defects while ensuring high productivity.
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
The device effectively prevents curling and excessive stretching, ensuring a stable and intact shape of the battery cell accommodating part, thereby reducing defects and extending the lifespan of the pouch-type secondary battery.
Implementation Method 1
a first press module disposed on one side of the pouch film and pressure-forming the pouch film in the other side direction to stretch the pouch film; and a second press module disposed on the other side of the pouch film and press-forming the pouch film in one side direction
Data Source
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AI summary
The present invention relates to a method for manufacturing a pouch-type secondary battery, and more specifically, relates to a pouch forming device capable of preventing a curling phenomenon, and a secondary battery manufacturing method using the same. According to one example of the present invention, it may provide a pouch forming device for a secondary battery comprising: a grip module holding and fixing edge portions of the pouch film; a first press module disposed on one side of the pouch film and pressure-forming the pouch film in the other side direction to stretch the pouch film; and a second press module disposed on the other side of the pouch film and press-forming the pouch film in one side direction to form a stepped battery cell accommodating part with respect to the edge portions.