Pouch Cell Electrolyte Injection Jig for Separator Stability
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Solution Overview
Problem
The existing electrolyte injection devices for pouch-shaped lithium secondary batteries often cause the separator to fold or peel off from the electrode during the electrolyte injection process due to the jig being spaced apart from the battery cell, leading to increased interface pressure and reduced production efficiency.
Innovation Solution
An electrolyte injection device with a movable pressing jig that presses and fixes the battery cell, comprising a pressing portion and a support portion, which maintains the separator's position during electrolyte injection, preventing folding or peeling off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection rate of the electrolyte is increased to increase the production rate, then the productivity is improved, but the separator is more likely to fold or peel off from the electrode due to increased force exerted by the electrolyte
Solution Approach 1:
The pressing jig applies preliminary pressing force to the electrode assembly in the direction perpendicular to the upper and lower surfaces before electrolyte injection. This preliminary action counteracts the harmful effect of electrolyte force that will occur during high-rate injection, preventing separator folding and peeling even when high injection rates are used to increase productivity
2Ease of operation
If the jig is disposed spaced apart from the battery cell to facilitate easy insertion and removal, then the ease of operation is improved, but the separator is more likely to fold or peel off due to lack of support during electrolyte injection
Solution Approach 1:
The pressing jig is designed to be movable rather than fixed, allowing it to dynamically change position. During electrolyte injection, the pressing jig moves to contact and press the electrode assembly, providing necessary support to prevent separator folding. After injection, it moves away to allow easy removal of the battery cell, thus resolving the contradiction between operational ease and separator stability
Data Source
AI summary
The present invention relates to an electrolyte injection device including a base portion on which a preliminary battery cell is disposed on an upper surface thereof, a movable pressing jig attached to the base portion, and an electrolyte injection pipe configured to inject an electrolyte into the preliminary battery cell, wherein the movable pressing jig includes a portion configured to press the preliminary battery cell in a direction perpendicular to an upper surface and a lower surface of an electrode assembly receiving portion of the preliminary battery cell, and thus it is possible to prevent a phenomenon in which a separator is folded or peeled off even when an electrolyte injection rate is high.