Secondary Battery Pouch Exterior Forming to Eliminate Sealing Dead Space
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Solution Overview
Problem
The existing manufacturing process for pouch type secondary batteries results in a sealing part with dead space, which reduces the energy density of the battery.
Innovation Solution
A method and apparatus for manufacturing the exterior of a secondary battery, involving a mold with recessed parts and a fluid supply system to form a forming part and a sealing part with reduced dead space, by folding and bonding the sheet material in a controlled manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional forming process is used to manufacture the pouch exterior, then the sealing part can be formed by attaching portions of the pouch area, but dead space occurs in the sealing part due to width deviation from the cup, reducing energy density
Solution Approach 1:
The patent replaces the traditional mechanical pressing process with a fluid pressure system. A mold with a recess corresponding to the cup shape is filled with fluid (water or air), and the sheet is pressed against the mold under fluid pressure to form the cup-shaped forming part. This substitution allows for more precise shape control and eliminates dead space in the sealing part, thereby increasing energy density while maintaining ease of manufacture
Solution Approach 2:
The patent changes the pressure parameter by using fluid pressure instead of mechanical pressing. The fluid pressure can be uniformly distributed and precisely controlled, allowing the sheet to conform exactly to the mold's recess shape. This parameter change ensures that the sealing part width matches the cup width without deviation, eliminating dead space and improving energy density
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 proposed solution effectively removes dead space in the sealing part, thereby increasing the energy density of the secondary battery.
Implementation Method 1
supplying a fluid from a side of the mold toward the recess part to form a forming part having a shape corresponding to a shape of the recess part
Data Source
AI summary
A method for manufacturing an exterior for a secondary battery includes a first step of preparing a sheet and a mold in which a recess part is formed; a second step of locating the sheet so that a portion of the sheet faces the recess part of the mold; and a third step of supplying a fluid from a side of the mold toward the recess part to form a forming part having a shape corresponding to a shape of the recess part in an area of the sheet, which is provided on the recess part. An exterior for a secondary battery and an apparatus for manufacturing the exterior for the secondary battery are also provided.