Double-Sided Tape for Battery Electrode Fixing
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Solution Overview
Problem
Conventional methods fail to effectively prevent the unwinding of electrode constituent bodies in secondary batteries, especially under external forces like vibration, and struggle to maintain sealing performance in large batteries due to inadequate adhesiveness between the electrode and the outer casing.
Innovation Solution
A double-sided tape with a heat-sensitive adhesive layer on one surface and a pressure-sensitive adhesive layer on the other is used to securely fix the electrode constituent body to the pouch-type outer casing, utilizing a substrate made of polyolefin or polyester with specific adhesive compositions to ensure strong adhesion and prevent unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a double-sided pressure-sensitive adhesive tape is used to fix the electrode constituent body to the outer casing, then the adhesion strength is improved, but air bubbles remain between the adhesive tape and the outer casing causing poor adhesion after high temperature storage
Solution Approach 1:
The patent changes the bonding mechanism from pressure-sensitive adhesion to heat-sensitive adhesion. The heat-sensitive adhesive layer is activated by heating during the sealing process, allowing it to flow and fill gaps completely, eliminating air bubbles and ensuring reliable adhesion after high temperature storage.
Solution Approach 2:
The heat-sensitive adhesive undergoes a phase transition from solid to viscous state when heated during sealing, enabling it to flow into the gap between the electrode constituent body and outer casing. After cooling, it returns to solid state, creating a strong, bubble-free bond that maintains reliability under high temperature storage conditions.
2Reliability
If the electrode constituent body is not fixed to the outer casing, then the sealing performance is maintained, but the electrode constituent body moves under vibration causing reduced adhesion and sealing performance
Solution Approach 1:
The patent replaces the mechanical fixing method (pressure-sensitive adhesive) with a thermal bonding method (heat-sensitive adhesive). The heat-sensitive adhesive is activated by heat during sealing, creating a strong bond that prevents movement under vibration while maintaining sealing performance.
3Ease of manufacture
If a single-sided adhesive tape is used for winding stop, then the winding is stopped, but the electrode constituent body cannot be fixed to the outer casing
Solution Approach 1:
The patent creates a multi-functional adhesive tape that serves both as a winding stop (using the pressure-sensitive adhesive side) and as a fixing element to the outer casing (using the heat-sensitive adhesive side). This single component performs multiple functions that previously required separate elements.
Solution Approach 2:
The patent uses a composite adhesive tape structure with two different adhesive layers (pressure-sensitive and heat-sensitive) on opposite sides of a substrate. Each layer serves a specific function, and together they provide both winding stop and outer casing fixation capabilities.
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 double-sided tape effectively prevents unwinding of the electrode constituent body and maintains sealing performance even under external forces, such as vibration, while maintaining battery capacity retention during storage at high temperatures.
Implementation Method 1
a surface containing a heat-sensitive adhesive for adhesion to the outer casing
Implementation Method 2
a surface containing a pressure-sensitive adhesive for adhesion to the electrode constituent body
Data Source
AI summary
The double-sided tape for fixing an electrode constituent body is used in an electrochemical device that houses in a pouch-type outer casing an electrode constituent body wherein a positive electrode member, a separator member and a negative electrode member are layered or wound. The double-sided tape comprises a surface having a pressure-sensitive adhesive for adhering to the electrode constituent body, and a surface having a heat-sensitive adhesive for adhering to the pouch-type outer casing.