Hard Coat Layer Blocks Electrolyte in Battery Adhesive
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Solution Overview
Problem
Conventional pressure sensitive adhesive tapes used in batteries fail to maintain adhesive strength when exposed to severe conditions such as electrolyte solutions and heat, leading to delamination and performance deterioration.
Innovation Solution
A pressure sensitive adhesive sheet with a hard coat layer between the base material and the adhesive layer, which blocks electrolyte solution permeation, maintaining adhesive strength and preventing delamination, and featuring a base material with flame retardancy and a pressure sensitive adhesive layer with specific gel fraction and storage elastic modulus for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure sensitive adhesive tape is used inside a battery, then the structure is simple and easy to manufacture, but the adhesive strength deteriorates when exposed to electrolyte solution and heat
Solution Approach 1:
The pressure sensitive adhesive sheet is divided into three distinct layers: a base material layer, a hard coat layer, and a pressure sensitive adhesive layer. This segmentation allows each layer to perform its specific function - the base material provides structural support, the hard coat layer blocks electrolyte penetration, and the adhesive layer maintains bonding strength under severe conditions.
Solution Approach 2:
The hard coat layer acts as an intermediary barrier between the electrolyte solution and the pressure sensitive adhesive layer. It prevents direct contact between the electrolyte and the adhesive, thereby protecting the adhesive properties from deterioration while allowing the adhesive to function effectively.
2Reliability
If the pressure sensitive adhesive sheet is provided with a hard coat layer, then the adhesive strength is maintained under severe conditions, but the manufacturing process becomes more complex
Solution Approach 1:
The hard coat layer is formed on the base material in advance before the pressure sensitive adhesive layer is applied. This preliminary action ensures that the barrier function is already in place before adhesive application, simplifying the overall manufacturing process by preventing the need for additional protective treatments later.
Solution Approach 2:
The pressure sensitive adhesive sheet uses a composite structure combining different materials with complementary properties: the base material provides mechanical strength, the hard coat layer provides chemical resistance and barrier properties, and the pressure sensitive adhesive layer provides bonding capability. This composite approach allows each material to be optimized for its specific function.
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 maintains adhesive strength, suppresses delamination, and prevents erroneous operations, thermal runaway, and short circuits in batteries, ensuring reliable performance under severe conditions.
Implementation Method 1
The hard coat layer blocks permeation of an electrolyte solution even when the pressure sensitive adhesive sheet is in contact with the electrolyte solution
Implementation Method 2
the pressure sensitive adhesive layer to well maintain the adhesive strength, and the pressure sensitive adhesive sheet is less likely to delaminate from an adherend
Data Source
AI summary
A pressure sensitive adhesive sheet for use for a battery is provided. The pressure sensitive adhesive sheet comprises a base material, a hard coat layer provided at one side of the base material, and a pressure sensitive adhesive layer provided at a side of the hard coat layer opposite to the base material. The pressure sensitive adhesive sheet can well maintain the adhesive strength to suppress delamination from an adherend even in case of contact with an electrolyte solution.