Pouch Battery Guide Frame for Electrolyte Injection and Degassing
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Solution Overview
Problem
Pouch-type secondary batteries face difficulties in electrolyte injection and degassing due to their flexible nature, making it structurally challenging to form inlets and outlets, which can lead to case damage and reduced sealing strength.
Innovation Solution
Incorporation of a pouch member with a sealing surface and a guide frame that accommodates a tube for electrolyte injection and gas discharge, allowing easy installation and fixation of tubes through a guide frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pouch-type battery uses a flexible case structure, then it achieves ease of deformation and lower manufacturing cost, but it becomes structurally difficult to form inlets and outlets for electrolyte injection and degassing
Solution Approach 1:
The case is divided into a body portion and a lid portion that can be separated. The lid portion can be opened to provide access for electrolyte injection and degassing operations, then reattached to maintain sealing. This segmentation allows the flexible pouch structure to accommodate maintenance operations without compromising the overall flexible case advantage.
Solution Approach 2:
A sealing member is introduced as an intermediary component between the body portion and lid portion. This sealing member enables temporary opening for electrolyte injection and degassing while maintaining the sealing integrity when closed, thus facilitating maintenance operations on the flexible pouch battery.
2Ease of operation
If the case is opened for electrolyte injection, then electrolyte can be replenished, but the case itself may be damaged and sealing strength is reduced
Solution Approach 1:
The sealing member is designed with enhanced sealing capability to compensate for potential damage to the flexible case during opening operations. The sealing member acts as a protective element that prevents case damage and maintains sealing strength even after repeated opening and closing cycles for electrolyte injection and degassing.
3Strength
If the case is completely sealed, then sealing strength is maintained, but it becomes impossible to inject additional electrolyte or discharge generated gas
Solution Approach 1:
The lid portion is designed to be dynamically openable and closable, transforming the static sealed case into a dynamic structure. This allows the case to switch between sealed state (maintaining sealing strength) and open state (enabling electrolyte injection and gas discharge), thus achieving both contradictory requirements through dynamic adaptability.
Data Source
AI summary
A pouch-type secondary battery according to one embodiment of the present invention comprises: a pouch member having an inner space; an electrode assembly accommodated in the inner space of the pouch member; a guide frame accommodated in the inner space of the pouch member; and a pipe for allowing communication between the outside and the inside of the pouch member, wherein the pipe can pass through the pouch member and at least one portion of the guide frame.