Pouch Battery Cell Recessed Sealing for Corrosion and Venting Control
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Solution Overview
Problem
Conventional pouch battery cells experience venting and electrical corrosion issues due to gas generation, leading to dimensional instability and performance degradation.
Innovation Solution
The pouch battery cell design features recessed sealing portions within the battery case, allowing for improved dimensional stability and preventing electrical corrosion by containing gas and maintaining electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing portion is exposed on the outer surface to maintain structural integrity, then the battery case maintains its sealing function, but the exposed sealing portion is susceptible to electrical corrosion and dimensional instability occurs due to gas expansion
Solution Approach 1:
The sealing portion is nested within the battery case by forming a recess that receives and houses the sealing portion internally. This nesting configuration protects the sealing portion from external electrical corrosion while maintaining its sealing function, as the sealing portion is contained within the battery case structure rather than being exposed on the outer surface
2Object-affected harmful factors
If the sealing portion is recessed internally to prevent electrical corrosion, then corrosion resistance is improved, but gas expansion may cause dimensional instability and venting
Solution Approach 1:
The battery case is segmented into distinct functional regions: a recessed portion that houses the sealing portion and prevents corrosion, and an expansion region that accommodates gas expansion. This segmentation allows the sealing portion to be protected internally while providing a dedicated space for pressure relief, thereby maintaining dimensional stability despite internal gas generation
Solution Approach 2:
The recessed structure acts as an intermediary between the sealing portion and the external environment. It provides protection from electrical corrosion while allowing the sealing portion to maintain its function. Additionally, the expansion region serves as a mediator that manages gas expansion pressure, preventing it from transmitting to the sealing portion and causing dimensional instability
3Object-affected harmful factors
If additional processing is applied to protect the sealing portion from corrosion, then corrosion resistance is improved, but manufacturing complexity and process time increase
Solution Approach 1:
The anti-corrosion protection function is merged into the battery case structure itself by forming a recess that houses the sealing portion. This structural integration eliminates the need for separate protective coatings or additional processing steps, as the recess configuration inherently protects the sealing portion from electrical corrosion while maintaining manufacturing simplicity
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
The recessed sealing structure effectively delays venting and prevents electrical corrosion, enhancing the cell's stability and manufacturing ease.
Implementation Method 1
the battery case is formed with sealing portions in which outer peripheral surfaces of the upper case and the lower case are heat-sealed to each other
Data Source
AI summary
A pouch battery cell according to one embodiment of the present disclosure includes an electrode assembly including a cathode, an anode and a separator interposed between the cathode and the anode; and a battery case to which the electrode assembly is attached, wherein the battery case comprises an upper case, a lower case, and a receiving portion formed between the upper case and the lower case, wherein the battery case is formed with sealing portions in which outer peripheral surfaces of the upper case and the lower case are heat-sealed to each other, and wherein one end of at least a part of the sealing portions is recessed in the inside of the battery case.