Pouch Secondary Battery Electrode Assembly for Faster Gas Discharge
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Solution Overview
Problem
The existing manufacturing methods for pouch-type lithium secondary batteries face inefficiencies in gas discharge during the activation and degassing processes, leading to potential swelling, lithium precipitation, and electrode deformation due to incomplete gas evacuation.
Innovation Solution
A method involving a stacked electrode assembly structure with alternating layers of negative and positive electrodes and separators, folded in a zigzag pattern, ensuring multiple open sides to facilitate gas flow into a designated gas pocket, and a pouch design that aligns electrodes to optimize gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly is manufactured with a closed long side structure, then the structural integrity is maintained, but the gas discharge efficiency deteriorates
Solution Approach 1:
The electrode assembly is segmented into multiple unit cells arranged in a specific pattern, with selective opening of long sides in certain unit cells to create gas discharge pathways while maintaining overall structural integrity through the segmented design
Solution Approach 2:
Different regions of the electrode assembly have different structural properties - specific unit cells have open long sides for gas discharge while others maintain closed structures for integrity, creating local quality variations that satisfy both requirements simultaneously
2Productivity
If the long side of the electrode assembly is opened to face the gas pocket, then the gas discharge efficiency is improved, but the structural stability deteriorates
Solution Approach 1:
The assembly is divided into multiple unit cells where only specific segments have open long sides facing the gas pocket, while other segments remain closed to provide structural support and stability
Solution Approach 2:
Multiple unit cells with different configurations (open and closed long sides) are merged into a single integrated electrode assembly, combining the gas discharge functionality of open structures with the stability of closed structures
Data Source
AI summary
A method for manufacturing a secondary battery includes manufacturing an electrode assembly having a stacked structure in which a negative electrode, an individual layer of a separator, a positive electrode, and an individual layer of the separator are repeated by alternately inserting the positive electrode and the negative electrode between the adjacent individual layers of the separator. Fold lines are formed on the separator at a predetermined interval, and the separator is folded in a zigzag shape along a vertical direction by the fold lines to form the plurality of individual layers; inserting the electrode assembly into a pouch; and discharging a gas from the Each of the positive electrode and the negative electrode is manufactured in a square shape so that remaining three sides except for one side facing the fold lines are opened.