Solar Cell Module Intermediate Moisture Absorbing Layer
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Solution Overview
Problem
Solar cell modules experience corrosion, bulging, and separation due to rapid temperature changes and moisture vaporization, particularly at the interface between the front and back encapsulant layers.
Innovation Solution
Incorporating an intermediate member with higher polarity or water absorbability between the front and back polyolefin-based encapsulant layers to absorb vaporized moisture and prevent volume expansion and bubble formation, while using polyolefin-based materials for the encapsulants to reduce corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyolefin-based encapsulant layers are used to prevent corrosion, then corrosion resistance is improved, but bulging and separation occur due to moisture vaporization during rapid temperature changes
Solution Approach 1:
An intermediate layer comprising a polymer material with higher polarity or higher water absorbability than the polyolefin-based encapsulant layers is introduced between the front and back encapsulant layers. This intermediate layer acts as a mediator that absorbs vaporized moisture through capillary action or adsorption, preventing moisture accumulation that causes bulging and separation, while allowing the polyolefin layers to maintain their corrosion protection function.
2Stability of the object's composition
If low density polyethylene encapsulant is used to prevent crystallization, then clouding is reduced, but moisture vaporization still causes bulging and bubbles at the interface
Solution Approach 1:
The intermediate layer with higher water absorbability serves as a moisture buffer between the low-density polyethylene encapsulant layers. When moisture vaporizes during rapid temperature changes, the intermediate layer absorbs the vapor through capillary action or adsorption, preventing the formation of bubbles and volume expansion at the encapsulant interfaces, while the low-density polyethylene layers maintain their optical clarity.
Solution Approach 2:
The invention changes the physical and chemical parameters of the encapsulant system by introducing a material with different polarity and water absorbability characteristics. The intermediate layer's higher polarity or water absorbability parameter allows it to interact with and absorb moisture vapor, fundamentally changing how the encapsulant system responds to temperature-induced moisture vaporization.
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 reduces corrosion of solar cells and prevents bulging and separation, enhancing the module's heat and moisture resistance and maintaining efficiency by redistributing light for improved photoelectric conversion.
Implementation Method 1
an intermediate member which is disposed between the front surface encapsulant member and the back surface encapsulant member, is in contact with the front surface encapsulant member and the back surface encapsulant member, and includes a polymer material having either one of a higher polarity and a higher water absorbability than the first polyolefin-based material and the second polyolefin-based material
Implementation Method 2
includes a polymer material having either one of a higher polarity and a higher water absorbability than the first polyolefin-based material and the second polyolefin-based material
Data Source
AI summary
A solar cell module includes: a plurality of solar cells; a front surface encapsulant member which is disposed on a front surface side of the plurality of solar cells and includes a first polyolefin-based material; a back surface encapsulant member which is disposed on a back surface side of the plurality of solar cells and includes a second polyolefin-based material; an intermediate member which is disposed between the front surface encapsulant member and the back surface encapsulant member and includes a polymer material having either one of a higher polarity and a higher water absorbability than the first polyolefin-based material and the second polyolefin-based material; and a front surface protective member and a back surface protective member disposed to place the plurality of solar cells, the front surface encapsulant member, and the back surface encapsulant member between the front surface protective member and the back surface protective member.