Solar Cell Test Platform with Pneumatic Vacuum Holding
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Solution Overview
Problem
Current solar cell testing methods are inefficient and damaging due to the need for extensive system reconfiguration and the use of threaded vacuum ports and blade probes, which cause damage to solar cells, and fail to accurately simulate the non-uniform thermal stresses experienced in field conditions.
Innovation Solution
A platform with a conductive surface featuring unthreaded vacuum ports and a pneumatic system that dynamically adjusts pressure based on the size of the solar cell, allowing for secure and efficient testing of solar cells of varying sizes without damage, and a method that uses interchangeable probe plates and cards to minimize manual reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded vacuum ports and blade probes are used to secure solar cells during testing, then the solar cells can be held firmly in place, but the solar cells suffer damage during testing and transitions between tests
Solution Approach 1:
The patent replaces mechanical threaded vacuum ports with a pneumatic vacuum system that uses air pressure differentials to hold solar cells. The vacuum plate creates a vacuum field that securely holds cells of various sizes without mechanical contact points that could cause damage. This pneumatic approach eliminates the harmful mechanical threading while maintaining strong holding force.
Solution Approach 2:
The vacuum plate acts as a flexible interface that can adapt to different solar cell sizes and shapes. Instead of rigid threaded ports, the system uses a compliant vacuum field that distributes holding force evenly across the cell surface, preventing localized stress concentrations that would cause damage.
2Adaptability or versatility
If extensive system reconfiguration is performed to transition between tests of different solar cell sizes, then the testing equipment can accommodate various cell dimensions, but the testing process becomes time-consuming and inefficient
Solution Approach 1:
The vacuum plate serves as a universal interface that can hold solar cells of any size without requiring system reconfiguration. The single vacuum plate with multiple vacuum ports provides multi-functionality, accommodating different cell dimensions through software-controlled selective activation of ports rather than physical reconfiguration.
Solution Approach 2:
The system dynamically adjusts which vacuum ports are activated based on the detected solar cell size and position. This dynamic control allows the same hardware configuration to adapt to different test scenarios, eliminating the need for manual reconfiguration while maintaining optimal holding for each cell type.
3Temperature
If thermal cycle chambers are used to simulate field thermal conditions, then the solar cells can be exposed to controlled temperature cycling, but the heating and cooling occurs too slowly to accurately represent field conditions
Solution Approach 1:
Instead of uniform convective heating throughout the entire chamber, the system applies thermal stress locally and directly to the solar cell under test. The vacuum plate with integrated heating/cooling can rapidly change the temperature of the cell's rear surface, creating realistic temperature gradients that match field conditions while achieving faster thermal cycling rates.
Solution Approach 2:
The patent replaces the slow convective thermal field of a traditional thermal cycle chamber with a direct thermal conduction system through the vacuum plate. This substitution of thermal transfer mechanism enables rapid temperature changes that accurately represent field thermal stresses without the time delays inherent in convective heating.
4Stability of the object's composition
If uniform convective heating is applied in thermal cycle chambers, then the temperature distribution is even across the solar cell, but this does not accurately represent the non-uniform thermal stresses experienced in field conditions
Solution Approach 1:
The system intentionally creates non-uniform temperature distribution across the solar cell to accurately represent field conditions. The vacuum plate can apply different temperatures to different regions of the cell, particularly creating temperature gradients between the front (illuminated) and rear (heat sink) surfaces, matching the thermal stress patterns experienced in actual operation.
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
Enables safe, reliable, and efficient testing of solar cells by preventing damage during transitions between tests and accurately simulating field-like thermal stresses, reducing test time and equipment reconfiguration needs.
Implementation Method 1
a pneumatic system that dynamically adjusts pressure based on the size of the solar cell
Implementation Method 2
a platform with a conductive surface featuring unthreaded vacuum ports
Data Source
AI summary
A platform for testing a solar cell is disclosed. The platform includes a plate defining a conductive surface configured to electrically contact the solar cell, two or more first vacuum ports disposed along a first area of the conductive surface of the plate, and two or more second vacuum ports disposed along a second area of the conductive surface of the plate. The second area covers a larger portion of the conductive surface compared to the first area. The solar cell is sized to seat against the first area of the conductive surface. The platform also includes a valve-sensor unit in fluid communication with the first vacuum ports and the second vacuum ports and a control board connected to the valve-sensor unit. The control board executes instructions to monitor a first pressure in the first vacuum ports and a second pressure in the second vacuum ports by the valve-sensor unit.