Dual Encapsulant System for PV Module Thermal Management
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Solution Overview
Problem
Current photovoltaic (PV) module encapsulants lack optimal mechanical stability and thermal management, particularly in concentrated photovoltaic (CPV) systems, where high thermal loads and mechanical stress are prevalent, leading to reduced efficiency and lifespan.
Innovation Solution
The use of a dual encapsulant system, where a first encapsulant with self-leveling properties and high adhesion provides structural support, and a second encapsulant with thermal conductivity and reflective fillers enhances heat dissipation and mechanical strength, potentially replacing traditional backsheets and thermal interface materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional single encapsulant systems are used, then manufacturing simplicity is maintained, but mechanical stability and thermal management are insufficient under high thermal loads and mechanical stress
Solution Approach 1:
The encapsulant system is divided into two distinct functional layers: a first encapsulant (EVA or PO) providing mechanical support and adhesion, and a second encapsulant (silicone-based) providing thermal management and environmental protection. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between mechanical stability and system complexity.
Solution Approach 2:
The patent employs composite material architecture by combining different encapsulant materials with complementary properties. The first encapsulant (EVA/PO) offers mechanical strength and adhesion, while the second encapsulant (silicone) provides thermal conductivity and flexibility. This composite approach enhances overall mechanical stability without requiring a single complex material.
2Temperature
If traditional encapsulants are used, then device simplicity is maintained, but heat dissipation capability is insufficient in concentrated photovoltaic systems
Solution Approach 1:
The second encapsulant layer is specifically designed with local thermal management properties, positioned directly between the PV cell and heat sink to maximize heat transfer efficiency. This localized quality enhancement addresses thermal management needs without complicating the entire device structure.
Solution Approach 2:
The silicone-based second encapsulant combines thermal conductivity with flexibility and environmental resistance, creating a composite thermal management solution that improves heat dissipation without requiring separate thermal interface materials or complex cooling structures.
3Strength
If conventional encapsulant configurations are used, then manufacturing process simplicity is maintained, but adhesion strength and structural support are insufficient under mechanical stress
Solution Approach 1:
The dual encapsulant system segments adhesion and structural support functions into the first encapsulant layer (EVA/PO), which is optimized for bonding to glass, metal, and PV cells. This segmentation allows the second layer to focus on thermal and environmental protection, maintaining manufacturing simplicity while enhancing adhesion strength.
Solution Approach 2:
The patent modifies material parameters by selecting EVA or PO for the first encapsulant based on specific adhesion requirements, and silicone compounds for the second encapsulant based on thermal and flexibility parameters. These parameter optimizations enhance adhesion strength without fundamentally changing the manufacturing process.
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 configuration improves the mechanical stability and thermal management of PV modules, enhancing their efficiency and lifespan, especially in CPV systems by allowing for better heat transfer and reduced thermal resistance.
Implementation Method 1
a first encapsulant with self-leveling properties and high adhesion provides structural support
Implementation Method 2
a second encapsulant with thermal conductivity and reflective fillers enhances heat dissipation
Implementation Method 3
a second encapsulant with thermal conductivity and reflective fillers enhances heat dissipation
Data Source
AI summary
A photovoltaic (PV) Module can include a substantially transparent cover, first encapsulant, a solar cell and a second encapsulant. The second encapsulant can be configured to allow thermal communication between the solar cell and a heat sink. Various configurations and methods of making the same are presented.