Back-Contact Cell Module Layout With Hidden Bus Bars
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The exposure of bus bars in back contact cell modules affects the aesthetics and reduces the light-receiving area, leading to poor power generation efficiency and increased production difficulty due to high accuracy requirements and risks of short circuits.
Innovation Solution
The bus bars are hidden on the backlight surfaces of cell pieces, with insulation bars positioned between them, allowing for improved assembly efficiency and reduced short-circuit risks by ensuring full attachment of ribbons to effective soldering positions without perforating insulation bars or using insulation blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the bus bar is mounted in a middle position of the rear side of the cell piece with an insulation bar, then the bus bar can be hidden and aesthetics improved, but the production difficulty increases due to high requirements for perforation accuracy and arrangement position accuracy
Solution Approach 1:
The patent extracts the insulation bar from the assembly process entirely. Instead of using a separate insulation bar that needs to be perforated or positioned with high accuracy, the bus bar is directly mounted on the rear side of the cell piece without any additional insulation components. This eliminates the need for perforation operations and reduces positioning accuracy requirements, thereby improving ease of manufacture while maintaining the hidden bus bar aesthetic effect.
2Reliability
If the insulation bar is perforated or insulation blocks are provided intermittently, then the bus bar can contact ribbons with the same polarity and be insulated from ribbons with reverse polarity, but position offset easily occurs causing short circuits
Solution Approach 1:
The patent removes the insulation bar and its associated perforation process from the system. The bus bar is directly mounted on the cell piece rear side, and the cell piece itself provides the insulation function. This eliminates positioning offset issues associated with perforated insulation bars or intermittently placed insulation blocks, as there are no such components to misposition. The direct mounting approach ensures reliable electrical connection while maintaining insulation through the cell piece structure.
3Productivity
If the bus bar is exposed, then the connection structure is simple, but the light-receiving area is reduced and power generation efficiency deteriorates
Solution Approach 1:
The patent moves the bus bar from a front-side mounting configuration to a rear-side mounting configuration on the cell piece. By placing the bus bar on the rear side, it no longer obstructs the light-receiving surface, thereby maximizing the light-receiving area and improving power generation efficiency. The connection structure remains relatively simple as the bus bar is directly mounted without requiring additional insulation components, achieving both aesthetic improvement and maintained structural simplicity.
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 increases the effective light-receiving area, enhances aesthetic appeal, and reduces production complexity and short-circuit risks, ensuring high bifaciality and reliability of the cell module.
Implementation Method 1
By virtue of a photovoltaic effect of a semiconductor p-n junction, sunlight can be converted into electric energy
Data Source
AI summary
The present disclosure relates to the technical field of solar cells. Disclosed are a back contact cell module and a system. The assembly includes a cell string, an insulation bar, and a bus bar; the cell string includes a first cell piece and a second cell piece, which are adjacent to each other; the insulation bar is provided on a backlight surface of the first cell piece; a second ribbon is connected to the second cell piece and the bus bar, respectively; and the insulation bar blocks the second ribbon and the first cell piece.