Wound Electrode Assembly Adhesive Layer Alignment
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Solution Overview
Problem
Stepped electrode assemblies in mobile devices often experience misalignment due to their unique structure, which can lead to corrosion and difficulty in maintaining the stepped shape, especially during the manufacturing and assembly processes.
Innovation Solution
A wound electrode assembly is designed with a first and second electrode sheet wrapped around each other, featuring an adhesive layer between the electrode sheets and an isolating membrane, along with protrusions and protective adhesive layers to enhance alignment and shape retention, reducing the risk of misalignment and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stepped electrode assembly structure is used to improve energy density for unique reserved space, then energy density is improved, but misalignment between electrode sheets occurs
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the electrode sheets and isolating membrane to prevent misalignment. The adhesive layer has controlled adhesive force (4-12 N/m) that maintains precise positioning of electrode sheets during assembly and operation, solving the alignment problem while preserving the stepped structure for high energy density.
Solution Approach 2:
The adhesive force parameter of the adhesive layer is precisely controlled within the range of 4-12 N/m. This parameter optimization ensures that the electrode sheets remain aligned without excessive adhesion that could cause other issues, resolving the contradiction between maintaining alignment and allowing proper assembly/disassembly.
2Manufacturing precision
If adhesive layer is added between electrode sheet and isolating membrane to reduce misalignment, then alignment is improved, but device complexity increases
Solution Approach 1:
The adhesive layer is applied locally only where needed - between electrode sheets and isolating membrane at specific regions requiring alignment control. This localized application provides necessary alignment precision without adding complexity throughout the entire device structure.
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 reduces the risk of misalignment and corrosion, improves shape retention, and enhances the safety and reliability of the electrode assembly by providing a consistent adhesive force within a specific range, thereby maintaining a good profiled state and improving energy density.
Implementation Method 1
an adhesive layer disposed between the first electrode sheet and the isolating membrane, and/or between the second electrode sheet and the isolating membrane. According to an embodiment of the present application, the adhesive layer provides an adhesive force in the range of 4 N/m to 12 N/m.
Data Source
AI summary
The embodiments of the present application provides a wound electrode assembly formed by winding a first electrode sheet, a second electrode sheet, and an isolating membrane disposed therebetween. The wound electrode assembly includes: a first surface having a first protrusion in the thickness direction of the wound electrode assembly; a first wound electrode assembly; a second wound electrode assembly wrapping the first wound electrode assembly, the first wound electrode assembly and the second wound electrode assembly sharing the first electrode sheet and the second electrode sheet; an adhesive layer disposed between the first electrode sheet and the isolating membrane, and/or between the second electrode sheet and the isolating membrane. The purpose of the present application is at least to provide a wound electrode assembly capable of reducing the risk of misalignment of the internal structures of the electrode assembly during the falling, and retaining the shape of the electrode assembly.