Laminated Battery Sealing Structure for Wrinkle-Free Electrode Adhesion
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Solution Overview
Problem
Conventional laminating devices face challenges in precisely adhering laminate sheets to small-sized electrodes, leading to excess portions, wrinkles, and potential damage or breakage, which compromises structural durability.
Innovation Solution
A laminated battery design featuring a fused laminate sheet with a step portion where the thickness near the electrode body is thinner than far from it, and a manufacturing method involving multiple fusing steps with position shifting to achieve a specific thickness ratio and adherence, ensuring the laminate sheet adheres tightly to the electrode body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminate sheet is used to cover small-sized electrodes, then the electrode is protected and sealed, but the laminate sheet cannot adhere precisely, causing excess portions and wrinkles that lead to damage and deteriorate structural durability
Solution Approach 1:
The fused portion of the laminate sheet is divided into a first fused portion and a second fused portion at different positions along the longitudinal direction. This segmentation allows the laminate sheet to be fused at multiple locations, preventing wrinkle formation while maintaining precise adherence to small-sized electrodes, thereby resolving the contradiction between structural durability and manufacturing precision
Solution Approach 2:
The laminate sheet is preliminarily configured with a fused portion having a specific longitudinal length ratio (0.05≤L1/L2≤0.5) before the battery assembly process. This preliminary configuration ensures that the laminate sheet can properly adhere to electrodes of varying sizes without generating wrinkles that would compromise structural durability, thus addressing both adherence precision and reliability requirements
2Manufacturing precision
If the laminate sheet is made to fit small-sized electrodes precisely, then adherence is improved, but the sheet may become too tight and cause damage or breakage
Solution Approach 1:
The laminate sheet is designed with non-uniform fusion characteristics: the first fused portion has a specific longitudinal length ratio (0.05≤L1/L2≤0.5) creating a localized stress distribution pattern. This local quality variation allows precise adherence at critical areas while maintaining overall structural integrity, preventing both loose adherence and excessive tightness that could cause damage
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 solution effectively suppresses wrinkle formation and enhances structural durability by ensuring precise adherence and controlled thickness ratios, preventing damage and maintaining structural integrity.
Implementation Method 1
a fused portion at which one end side and another end side of the laminate sheet, which covers the electrode body, are fused
Data Source
AI summary
A laminated battery has an electrode body and a laminate sheet covering the electrode body, and has a fused portion at which one end side and another end side of the laminate sheet that covers the electrode body are fused together. The fused portion has a step portion at which a thickness of a region near the electrode body side is thinner than a thickness of a region far from the electrode body side. Ratio (LS1/LE) of outer peripheral length LE of the electrode body and inner peripheral length LS1 of the laminate sheet that covers the electrode body is greater than or equal to 1.00 and less than or equal to 1.05.