Pouch Film Gas Chamber Structure to Prevent Electrolyte Backflow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pouch films made of metal materials face challenges in maintaining their shape during electrolyte injection, leading to potential swelling and electrolyte backflow, which affects the stability and strength of secondary batteries.
Innovation Solution
A pouch film with a gas chamber section and deformation parts in a predetermined pattern, such as concave or convex shapes, to maintain the gas chamber inlet shape and control electrolyte flow, ensuring smooth injection and discharge of generated gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a metal material pouch film is used for excellent elongation, then the pouch film can be easily stretched during electrolyte injection, but the pouch film cannot maintain its original shape during injection
Solution Approach 1:
The pouch film is divided into different functional sections: a housing section made of metal material for elongation, and a gas chamber section made of a material with high shape retention to maintain the gas chamber inlet shape during electrolyte injection.
Solution Approach 2:
Different materials are used in different parts of the pouch film: the housing section uses metal material for flexibility and elongation, while the gas chamber section uses a material with high shape retention to maintain its shape during injection, providing localized properties where needed.
2Productivity
If electrolyte is rapidly injected into the pouch film, then the injection process is faster and more efficient, but electrolyte backflow occurs
Solution Approach 1:
The gas chamber section with high shape retention maintains the gas chamber inlet shape during rapid electrolyte injection, preventing electrolyte backflow by resisting deformation that would cause backflow, thus counteracting the potential harmful effect before it occurs.
3Device complexity
If gas is not discharged from the electrode assembly, then the secondary battery structure remains simple, but the battery swells and loses strength and stability
Solution Approach 1:
The gas chamber section is integrally formed with the housing section, combining the housing function and gas discharge function into a single integrated structure, maintaining simplicity while enabling gas discharge to prevent swelling.
4Adaptability or versatility
If the gas chamber inlet shape is not maintained during injection, then the pouch film is more flexible, but electrolyte flow control is poor and backflow occurs
Solution Approach 1:
The pouch film is segmented into a flexible housing section for overall adaptability and a rigid gas chamber section for precise inlet shape maintenance, allowing both flexibility and precision to coexist in different parts of the structure.
Data Source
AI summary
Embodiments of the present invention provides a pouch film. In manufacturing a secondary battery, a gas may be generated when reacting an electrode assembly with an electrolyte. After the generated gas is discharged, the pouch film may be sealed. In this case, a deformation part may be formed in the gas chamber section which serves as a passage for discharging the gas, specifically, in the gas chamber passage, thus to prevent the electrolyte from flowing backward and maintain shapes of the gas chamber inlet during injecting the electrolyte.