Bypass Diode Thermal Management in Photovoltaic Devices
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Solution Overview
Problem
Conventional optoelectronic systems, such as LED and PV devices, face challenges in thermal management and assembly, particularly in integrating bypass diodes, which require a low resistance thermal path and robust electrical isolation, and are limited by complex assembly processes and increased risk of overheating due to high heat flux and shading issues.
Innovation Solution
The integration of bypass diodes within a cell package or laminate system using a flexible substrate with continuous roll processing, where diodes are soldered to leads and encapsulated between a glass cover sheet and a metal heat spreader, providing a low thermal resistance path and reducing assembly complexity by eliminating back-sheet penetrations, allowing for improved thermal and electrical functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bypass diodes are externally mounted on optoelectronic systems, then electrical isolation and thermal management are improved, but device complexity and assembly complexity increase
Solution Approach 1:
The patent combines the bypass diode with the heat spreader into a single integrated component. The diode is mounted directly on the heat spreader surface, eliminating the need for separate external mounting structures and back-sheet penetrations. This integration maintains electrical isolation and thermal management functions while significantly reducing assembly complexity and the number of discrete parts required.
2Device complexity
If bypass diodes are integrated within cell package, then assembly complexity is reduced, but thermal management becomes more difficult due to high heat flux
Solution Approach 1:
The patent introduces a heat spreader as an intermediary component between the diode and the ambient environment. The heat spreader is thermally coupled to the diode through direct contact on its surface, providing an efficient thermal conduction path. This intermediary structure enables effective heat dissipation from the diode while maintaining the integrated design, thus managing the high heat flux without requiring complex external thermal management systems.
3Temperature
If conventional external mounting is used, then thermal path is established, but manufacturing precision and material costs increase
Solution Approach 1:
The patent merges the diode mounting function with the heat spreader structure itself. The diode is positioned directly on the heat spreader surface, eliminating the need for separate mounting brackets, adhesives, or mechanical fasteners that would be required in conventional external mounting. This integration reduces manufacturing precision requirements and material costs while maintaining effective thermal conduction from the diode to the heat sink.
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 approach enhances thermal management, reduces diode temperatures, increases light-to-electrical conversion efficiency, and reduces component degradation and failure, while enabling high-volume continuous manufacturing and reducing material costs and form factor.
Implementation Method 1
providing a low thermal resistance path
Implementation Method 2
increases light-to-electrical conversion efficiency
Data Source
Figure 1
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Figure 2B
AI summary
Optoelectronic devices with bypass diodes are described. An optoelectronic device includes a bypass diode, a heat spreader unit disposed above, and extending over, the bypass diode, and a heat sink disposed above the heat spreader unit. Another optoelectronic device includes a bypass diode, a heat spreader unit disposed above, but not extending over, the bypass diode, and a heat sink disposed above the heat spreader unit.