Photovoltaic Module Submodule Segmentation for Resistive Loss Reduction
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Solution Overview
Problem
Existing photovoltaic module technologies face challenges in efficiently connecting submodules in parallel to optimize current and voltage output, leading to suboptimal performance under varying light conditions and increased resistive losses.
Innovation Solution
A photovoltaic module design that includes a transparent conductive layer, multiple submodules connected in series, and a shared cell for parallel interconnection, along with a bus bar assembly and lead foils, to enhance electrical contact and reduce resistive losses, utilizing cadmium telluride and cadmium sulfide layers for superior light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If submodules are connected in series to increase voltage output, then voltage output is improved, but current output is limited and resistive losses increase
Solution Approach 1:
The photovoltaic module divides the array into multiple submodules that can be independently connected in series strings. Each submodule contains a specific number of cells (e.g., 72 cells per submodule for 24V operation), allowing the overall system to achieve higher voltage through series connection of submodules while maintaining flexibility in configuration to optimize current output and reduce resistive losses.
2Power
If submodules are connected in parallel to increase current output, then current output is improved, but voltage output decreases and device complexity increases
Solution Approach 1:
The module structure segments the photovoltaic array into standardized submodules with defined electrical characteristics. This segmentation allows flexible series-parallel configurations to achieve desired voltage and current outputs without complex custom wiring, as each submodule serves as a modular building block with consistent performance parameters.
Solution Approach 2:
The submodule design provides multi-functionality by serving as a universal building block that can be configured in various series-parallel arrangements to meet different voltage and current requirements. The same submodule design (e.g., 72 cells per submodule) can be used to create modules with different electrical outputs by simply changing the connection configuration, reducing overall system complexity.
3Ease of manufacture
If conventional connection methods are used, then manufacturing is simple, but performance under varying light conditions is suboptimal
Solution Approach 1:
By segmenting the array into submodules with standardized cell counts (e.g., 72 cells per submodule), the design ensures consistent performance characteristics across all submodules. This segmentation allows each submodule to be manufactured and tested independently, then assembled into larger modules with predictable performance under varying light conditions, maintaining both manufacturing simplicity and performance reliability.
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 optimizes current output, reduces resistive losses, and improves performance under cloudy and diffuse light conditions, while allowing for adjustable output voltage to meet system requirements.
Implementation Method 1
Photovoltaic modules are typically used in arrays of interconnected submodules. Each submodule is comprised of individual solar cells, typically connected in series.
Implementation Method 2
utilizing cadmium telluride and cadmium sulfide layers for superior light absorption
Data Source
AI summary
A photovoltaic module may include a transparent conductive layer on a substrate a first submodule including a first plurality of photovoltaic cells connected in series and a second submodule including a second plurality of photovoltaic cells connected in series.