Electrochemical Energy Storage Device with Dissolvable Adhesive
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Solution Overview
Problem
Lithium-ion secondary batteries face issues during drop tests due to adhesive tape problems, such as seal opening, leakage, and short circuits, and the traditional adhesive tapes complicate the packaging process by bonding with the shell, affecting kinetic performance due to electrochemically inert protective layers dissolving in the electrolyte.
Innovation Solution
An electrochemical energy storage device with an adhesive material having a non-adhesive protective layer that dissolves in the electrolyte, exposing an adhesive surface for bonding between the electrode assembly and the packing shell, and includes a charge-carriable substance to enhance electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional double-sided adhesive tape is used to fix the electrode assembly to the packing shell, then the bonding strength is improved, but the adhesive tape bonds with the packing shell during packaging, increasing the difficulty of the packaging process
Solution Approach 1:
The adhesive tape is segmented into two separate layers: an adhesive layer for bonding and a protective layer for easy packaging. The adhesive layer provides strong bonding between the electrode assembly and packing shell, while the protective layer prevents the adhesive surface from bonding with the packing shell during packaging, thereby resolving the contradiction between bonding strength and packaging ease.
Solution Approach 2:
The protective layer acts as an intermediary between the adhesive layer and the packing shell. It temporarily covers the adhesive surface during packaging, preventing unwanted bonding, and is subsequently removed to allow the adhesive layer to bond the electrode assembly to the packing shell. This intermediary layer resolves the conflict between strong bonding and easy packaging.
2Reliability
If the protective layer of the adhesive tape dissolves in the electrolyte, then the electrochemical performance is improved, but the adhesive surface may bond prematurely with the packing shell
Solution Approach 1:
The protective layer is designed to dissolve in the electrolyte after the electrode assembly is properly positioned and bonded to the packing shell. This preliminary protective action prevents premature bonding during packaging, while the controlled dissolution after packaging ensures good electrochemical performance without compromising adhesive stability during the critical packaging phase.
Solution Approach 2:
The protective layer provides beforehand cushioning by covering the adhesive surface before any potential premature bonding can occur. It acts as a temporary protective barrier during packaging and handling, and its subsequent dissolution in the electrolyte provides the beneficial electrochemical effects without causing premature bonding issues.
3Ease of manufacture
If a conventional polymer protective layer is used, then the adhesive surface is protected during packaging, but the protective layer deteriorates the kinetic performance due to electrochemical inertness
Solution Approach 1:
The protective layer material parameters are changed from conventional electrochemically inert polymers to materials that are soluble in the electrolyte and can bear electric charges. This parameter change allows the protective layer to maintain its protective function during packaging while transforming into a beneficial component that improves kinetic performance after dissolution, eliminating the trade-off between packaging protection and electrochemical performance.
Solution Approach 2:
The adhesive tape is designed as a composite structure with an adhesive layer and a protective layer made of electrochemically active materials. This composite material approach allows the protective layer to serve dual functions: protecting the adhesive surface during packaging and enhancing electrochemical performance after dissolution, thereby resolving the contradiction between packaging protection and kinetic performance.
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
This solution prevents packaging difficulties, improves the drop test pass rate, and enhances the cycling and low-temperature performance of lithium-ion batteries by using a charge-carriable substance as a good charge carrier after the protective layer dissolves.
Implementation Method 1
the protective layer is non-adhesive under normal temperature and pressure, the adhesive surface of the adhesive layer will not expose until the protective layer is completely or partially dissolved in the electrolyte
Implementation Method 2
The protective layer contains a substance that can bear an electric charge... the substance that can bear charges can be used as a good charge carrier to improve the circulation performance
Data Source
AI summary
An electrochemical energy storage device comprising an electrode assembly, an electrolyte, a packing shell and an adhesive material located between the electrode assembly and the packing shell. The adhesive material comprises an adhesive layer and a protective layer. A surface of the adhesive layer, arranged on an outer surface of the electrode assembly and far away from the cell, or a surface of the adhesive layer, arranged on an inner surface of the packing shell and close to the electrode assembly, are adhesive surfaces. The protective layer is arranged on the adhesive surface of the adhesive layer. The protective layer is non-cohesive at a normal temperature and pressure, after the protective layer is fully or partially dissolved in the electrolyte, the adhesive surface of the adhesive layer is exposed to bond the electrode assembly with the packing shell, and the protective layer contains a substance to bear an electric charge.