Pouch Battery Sealing Layout for Electrode-Separator Bonding
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Solution Overview
Problem
Pouch type secondary batteries face issues with poor bonding between electrode and separator ends during the manufacturing process, leading to overvoltage and electrolyte consumption, requiring additional sealing processes and tools, which increase manufacturing time and inefficiency.
Innovation Solution
A sealing method and device that includes a first sealing area at the pouch edge and a second sealing area corresponding to the electrode assembly, both sealed by heat and pressure, with the second area having a larger area to enhance adhesion between electrode and separator ends, preventing overvoltage and electrolyte consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing is performed only on the exterior material portion of the pouch type case, then the manufacturing process is simple, but the ends of the electrode and separator are poorly bonded causing overvoltage and electrolyte consumption
Solution Approach 1:
The sealing process is divided into two distinct sealing areas: a first sealing area on the exterior material portion of the pouch case, and a second sealing area on the electrode assembly. This segmentation allows each area to be sealed with appropriate precision requirements, ensuring reliable bonding at the electrode-separator interface while maintaining manufacturing efficiency through differentiated sealing zones.
Solution Approach 2:
Different sealing qualities are applied to different regions of the pouch battery. The second sealing area corresponding to the electrode assembly receives higher precision sealing to ensure proper bonding between electrode and separator ends, while the first sealing area on the exterior material uses standard sealing. This local differentiation of quality ensures reliability where needed without unnecessarily complicating the entire manufacturing process.
2Reliability
If an additional sealing process is carried out to bond the ends of the electrode and separator, then adhesion is improved, but manufacturing time increases and separate sealing tools are required
Solution Approach 1:
The sealing device integrates two sealing functions into a single unified tool: a first sealing unit for the exterior material portion and a second sealing unit for the electrode assembly. Both sealing operations are performed simultaneously in one manufacturing step, eliminating the need for separate sealing processes and additional tools, thereby improving adhesion without sacrificing manufacturing efficiency.
Solution Approach 2:
The sealing device is designed as a multi-functional tool that can seal both the pouch case exterior material and the electrode assembly in a single operation. This universal sealing device performs multiple sealing functions that would otherwise require separate specialized tools, consolidating the manufacturing process and maintaining high productivity while ensuring proper adhesion between electrode and separator.
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
This approach enhances adhesion density in pouch type secondary batteries without additional manufacturing processes, improving the bonding between the electrode and separator ends, thus preventing overvoltage and electrolyte consumption.
Implementation Method 1
a sealing tool that seals a first sealing area disposed at an edge of the pouch, and a second sealing area disposed in a region corresponding to the electrode assembly of the pouch
Implementation Method 2
a sealing tool that seals a first sealing area disposed at an edge of the pouch, and a second sealing area disposed in a region corresponding to the electrode assembly of the pouch
Data Source
AI summary
A secondary battery according to the present invention includes an electrode assembly, in which an electrode and a separator are alternately stacked, and a pouch in which the electrode assembly is accommodated and of which a portion includes a sealing part that is a bonded portion. The sealing part may include a first sealing area, which is spaced a predetermined distance from the electrode assembly and disposed at an edge of the pouch, and a second sealing area that is an area corresponding to the electrode assembly. The present invention also includes a device for sealing the secondary battery and a method for forming same.