Snap-Together PV Junction Box With Integrated Terminal
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Solution Overview
Problem
Existing electrical connections for photovoltaic panels face issues with shading, leading to voltage loss and overheating due to unbalanced current distribution, and require additional components like bypass diodes to prevent damage, while also needing secure and tool-minimal assembly methods for efficient installation.
Innovation Solution
A snap-together junction box design with an upper and lower portion, featuring a clamp and elastic polymeric elements for secure wire connection, a spring-loaded terminal for pressure sealing, and integrated diodes for current management, allowing for efficient electrical isolation and hermetic sealing without extensive hand tool use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional junction boxes with clamping plates and multiple components are used, then secure electrical connections are achieved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent combines multiple separate components (lower junction box, clamping plate, upper junction box with terminal) into a single integrated unit. The terminal is directly formed as part of the upper junction box, eliminating the need for separate clamping plates and reducing the number of parts while maintaining secure electrical connections through the integrated design
Solution Approach 2:
The single integrated junction box performs multiple functions: it provides electrical connection, mechanical support, sealing, and terminal formation all in one component. This multi-functional design reduces device complexity while maintaining reliability by consolidating what were previously separate components into a unified structure
2Reliability
If traditional assembly methods with extensive hand tools are used, then secure connections are achieved, but installation time and productivity decrease
Solution Approach 1:
The junction box is designed with a snap-fit assembly mechanism where the upper and lower portions can be quickly connected without tools. The entry slot allows wire insertion before final sealing, enabling a streamlined assembly process that maintains connection security while significantly reducing installation time compared to traditional tool-based assembly methods
3Power
If photovoltaic cells are connected in series to achieve desired voltage, then output voltage increases, but current distribution becomes unbalanced leading to voltage loss and overheating
Solution Approach 1:
The integrated terminal design with spring-loaded contact acts as an intermediary that optimizes current distribution in series connections. The elastic polymeric element and spring mechanism provide consistent contact pressure and electrical conductivity, ensuring balanced current flow through all series-connected cells and reducing voltage loss and heat generation at connection points
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 provides reliable electrical connections that minimize voltage loss, prevent overheating, and facilitate easy assembly, ensuring efficient and secure interconnections between photovoltaic panels and electronic modules while maintaining electrical isolation and hermeticity.
Implementation Method 1
The lower portion may have an elastic polymeric element disposed between the raised protrusion and the wire
Implementation Method 2
The terminal is typically spring loaded
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A junction box adapted to provide an electrical connection to an electrical wire attached to a photovoltaic panel. The junction box has a lower portion which has an entry slot to allow entry of the wire into the junction box and a raised protrusion over which the wire is bent and formed to be substantially in the same shape as the raised protrusion. The junction box also has a clamp adapted to be attachable to said lower portion, whereby the clamp holds the wire in place for providing the electrical connection. The wire is preferably bus ribbon. The lower portion preferably has an elastic polymeric element disposed between the raised portion and the wire. The raised protrusion may have an elastic polymeric element. The junction box also has an upper portion including a terminal. The terminal connects to an electrical load. The terminal is adapted to be applied under pressure onto the wire, thereby conforming the terminal to be of substantially the same shape as the protrusion. The upper portion typically has a fastener which closes the upper portion to the lower portion under pressure.