Pouch Battery Fixing Member Shape Stability
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Solution Overview
Problem
Rechargeable batteries, particularly those in small electronics, face performance deterioration due to shape deformation under external impacts, which affects their energy density and functionality.
Innovation Solution
A pouch-type rechargeable battery design featuring a spirally-wound electrode assembly with a fixing member made of materials like polyethylene terephthalate (PET), polyimide (PI), and oriented polypropylene (OPP), which thermo-bonds to maintain the electrode assembly's shape and provides double-sealing to prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly is spirally-wound to achieve compact structure, then the battery energy density is improved, but the electrode assembly becomes susceptible to shape deformation under external impact
Solution Approach 1:
The patent employs a pouch structure with sealing parts that act as flexible constraints, enclosing the spirally-wound electrode assembly. This flexible packaging maintains the compact jelly roll configuration while providing shape stability under external impact, resolving the contradiction between compactness and structural stability.
Solution Approach 2:
The electrode assembly is segmented into discrete components (positive electrode plate, separator, negative electrode plate) that are spirally-wound and then constrained by the pouch structure. This segmentation allows the assembly to maintain its compact form while the pouch provides external shape stabilization.
2Stability of the object's composition
If the fixing member width is increased to improve electrode assembly stability, then shape maintenance is improved, but the sealing effectiveness is reduced
Solution Approach 1:
The fixing member is designed with non-uniform width: a first (wider) part for contacting and stabilizing the electrode assembly, and a second (narrower) part for overlapping and sealing with the pouch. This local differentiation allows the same component to fulfill both shape maintenance and sealing functions effectively.
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 design stabilizes the electrode assembly's shape and enhances the battery's performance by preventing deformation and ensuring reliable sealing, thus maintaining energy density and functionality.
Implementation Method 1
a sealing part that surrounds the accommodation part and is thermo-bonded
Data Source
AI summary
A pouch type rechargeable battery according to an exemplary embodiment includes: an electrode assembly that includes a first electrode, a separator, and a second electrode; a fixing member that includes a first fixing member and a second fixing member positioned at opposite sides of the electrode assembly; and a pouch that is provided with an accommodation part for accommodating the electrode assembly and a sealing part that surrounds the accommodation part and is thermo-bonded, wherein the fixing member may have a first part overlapping the electrode assembly, a second part overlapping the sealing part, and a width of the second part is narrower than the sealing part.