Induction Curing System for Photovoltaic Paste
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Solution Overview
Problem
The manual and time-consuming process of fabricating solar panels with cascaded cell arrangements is costly and prone to errors, and existing heating methods for curing conductive paste are inefficient, leading to prolonged processing times and potential damage to photovoltaic structures.
Innovation Solution
A thermal curing system comprising a wafer carrier made of low thermal conductivity materials like polybenzimidazole (PBI) plastic and a heater with a radiation block that emits heat indirectly to the photovoltaic structures, optimizing heat transfer and reducing processing time while preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If direct contact heating is used to cure conductive paste, then heating efficiency is improved, but photovoltaic structures may be damaged due to excessive heat or uneven temperature distribution
Solution Approach 1:
A susceptor material is introduced as an intermediary between the heating source and the photovoltaic structures. The susceptor absorbs electromagnetic energy and converts it to heat, which is then transferred to the conductive paste indirectly. This mediator enables efficient heating while protecting the photovoltaic structures from direct exposure to excessive heat and electromagnetic radiation.
Solution Approach 2:
The patent replaces conventional direct contact or radiant heating mechanisms with electromagnetic induction heating. An alternating magnetic field induces eddy currents in the susceptor, generating heat through resistive heating (Joule heating) without direct thermal contact. This substitution allows for precise control of heating parameters and eliminates the harmful effects of direct high-temperature exposure to the photovoltaic structures.
2Ease of operation
If manual fabrication processes are used for cascaded cell arrangements, then flexibility in handling is maintained, but production time increases and error rates rise
Solution Approach 1:
The fabrication process is segmented into distinct modular steps: positioning photovoltaic structures on a carrier, applying conductive paste, assembling cascaded arrangements, and curing. Each step can be independently optimized or automated. The segmented approach allows manual dexterity in critical positioning steps while enabling automated processing in repetitive steps, balancing flexibility with productivity.
Solution Approach 2:
Photovoltaic structures are pre-positioned on a carrier with appropriate spacing and alignment before the cascaded assembly process. Conductive paste is pre-applied to designated areas. These preliminary actions reduce the complexity and time of subsequent assembly steps, enabling faster production while maintaining precision through pre-planned positioning rather than real-time manual adjustment.
3Device complexity
If conventional heating methods are used for curing conductive paste, then equipment simplicity is maintained, but processing time is prolonged and energy efficiency decreases
Solution Approach 1:
Conventional thermal conduction or convection heating is replaced with electromagnetic induction heating using a susceptor. The alternating magnetic field penetrates the susceptor and generates heat internally through induced eddy currents, providing rapid and uniform heating. This substitution dramatically reduces processing time and improves energy efficiency compared to conventional methods, while the overall equipment complexity remains manageable due to the use of standard induction heating components.
Solution Approach 2:
The heating mechanism is changed from slow thermal diffusion to rapid electromagnetic energy conversion. By adjusting parameters such as frequency, power level, and susceptor material properties, the heating process can be precisely controlled to achieve optimal curing conditions in a fraction of the time required by conventional methods, transforming a time-consuming process into an efficient 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
The system efficiently cures conductive paste between overlapping busbars, improving bonding quality, reducing production costs, and increasing throughput by enhancing heating uniformity and energy efficiency.
Implementation Method 1
The heater can include a radiation block, and the radiation surface of the radiation block can be coated with a substantially dark colored coating
Implementation Method 2
the radiation surface of the radiation block can be coated with a substantially dark colored coating
Implementation Method 3
The wafer carrier can carry a plurality of photovoltaic structures and can include a surface element that is in direct contact with the photovoltaic structures. The surface element can be substantially thermally insulating
Data Source
AI summary
One embodiment can provide a system for curing conductive paste applied on photovoltaic structures. The system can include a wafer carrier for carrying a plurality of photovoltaic structures and a heater. The wafer carrier can include a surface element that is in direct contact with the photovoltaic structures and is substantially thermally insulating. The heater can be positioned above the wafer carrier. The heater can include a heated radiation surface that does not directly contact the photovoltaic structures.