Electrochemical Laminate Particle Layout for Blocking and Adhesion
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Solution Overview
Problem
Conventional laminates for electrochemical devices face challenges in balancing blocking resistance and low-temperature adhesiveness, failing to provide effective adhesion and heat resistance simultaneously, especially in central cell regions with limited heat transmission during the production of electrochemical devices.
Innovation Solution
A laminate with a functional layer composed of heat-resistant fine particles, adhesive particles containing a polyester polymer with a specific glass-transition temperature range, and a binder, where the adhesive particles have a larger volume-average particle diameter than the heat-resistant region, enhancing both blocking resistance and low-temperature adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat pressing time is shortened to improve production efficiency, then productivity increases, but adhesiveness of the functional layer deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the functional layer by incorporating specific polymers (polyester polymer with glass transition temperature of -50°C to 0°C, polyacrylic polymer, or polyvinylidene fluoride polymer) in controlled proportions. This compositional parameter change enables the functional layer to achieve sufficient adhesiveness at lower heat pressing temperatures and shorter times, thereby improving production efficiency while maintaining bond strength.
Solution Approach 2:
The patent creates a composite functional layer by combining multiple polymer materials with complementary properties. The polyester polymer provides low-temperature adhesiveness, while polyacrylic or polyvinylidene fluoride polymers contribute to heat resistance and structural stability. This composite structure enables the functional layer to display both excellent adhesiveness and heat resistance simultaneously, resolving the contradiction between production efficiency and bonding quality.
2Strength
If heat pressing temperature is reduced to improve low-temperature adhesiveness, then adhesiveness improves, but heat resistance deteriorates
Solution Approach 1:
The patent carefully controls the glass transition temperature parameter of the polyester polymer within -50°C to 0°C to optimize low-temperature adhesiveness. Simultaneously, it limits the content to 1-50 mass% to prevent excessive softening at elevated temperatures. This parameter optimization allows the functional layer to maintain strong adhesion at low temperatures while preserving adequate heat resistance.
Solution Approach 2:
The patent combines polyester polymer (providing low-temperature adhesiveness) with polyacrylic polymer or polyvinylidene fluoride polymer (providing heat resistance). The polyacrylic polymer with its higher glass transition temperature and the polyvinylidene fluoride polymer with its exceptional thermal stability create a composite system where the low-temperature bonding performance is enhanced without sacrificing high-temperature structural integrity.
3Strength
If functional layer composition is optimized for adhesiveness, then low-temperature adhesiveness improves, but blocking resistance deteriorates
Solution Approach 1:
The patent optimizes the molecular weight and glass transition temperature parameters of the polyester polymer to achieve a balance between adhesiveness and blocking resistance. By controlling the glass transition temperature within -50°C to 0°C and limiting content to 1-50 mass%, the functional layer achieves sufficient low-temperature bonding while maintaining adequate blocking performance through controlled molecular mobility at operating temperatures.
Solution Approach 2:
The patent creates a composite functional layer where polyester polymer provides low-temperature adhesiveness and polyacrylic or polyvinylidene fluoride polymers provide thermal stability and blocking resistance. The complementary properties of these materials work synergistically: the polyester ensures strong bonding at low temperatures during assembly, while the polyacrylic or polyvinylidene fluoride components maintain structural rigidity and blocking performance at operating temperatures, preventing functional layer adhesion between stacked cells.
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 laminate achieves excellent blocking resistance and low-temperature adhesiveness, improving the production efficiency and device characteristics such as rate and cycle characteristics of electrochemical devices.
Implementation Method 1
the adhesive polymer contains a polyester polymer having a glass-transition temperature in a range of not lower than 10° C. and not higher than 95° C.
Data Source
AI summary
It could be helpful to provide a laminate for an electrochemical device that can advantageously be used as a device member having excellent blocking resistance and low-temperature adhesiveness. The laminate includes a substrate and a functional layer. The functional layer contains heat-resistant fine particles; adhesive particles containing an adhesive polymer; and a binder. The adhesive polymer contains a polyester polymer having a glass-transition temperature in a range of not lower than 10° C. and not higher than 95° C. In plan view of the laminate from a side corresponding to the functional layer, the functional layer includes an adhesion region formed of the adhesive particles and a heat-resistant region formed of the heat-resistant fine particle and the binder. In the laminate, the volume-average particle diameter of the adhesive particles is larger than the average stacking direction height of the heat-resistant region.