Solar Battery Module Interconnector Segmentation
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Solution Overview
Problem
The increase in resistance loss due to the interconnector in solar battery modules reduces the performance of solar battery modules, and conventional methods to reduce this by increasing the cross-sectional area of the interconnector either decrease the light-receiving area or increase residual stress in the cells, leading to potential breakage.
Innovation Solution
The solar battery module design includes solar battery cells with a rectangular shape and specific bus electrodes, where the interconnector connects the light-receiving-surface bus electrodes to the rear-surface bus electrodes of adjacent cells, reducing the electric current flowing through the interconnector and thus minimizing resistance loss without increasing the cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cross-sectional area of the interconnector is increased to reduce resistance loss, then the resistance loss is reduced, but the light-receiving area of the cell is reduced and power generation amount is reduced
Solution Approach 1:
The invention divides the cell into multiple segments (first cell and second cell) and introduces an intermediate connection point (third bus electrode) to split the interconnector current path. This segmentation allows the current to be distributed across multiple smaller interconnectors rather than flowing through a single large interconnector, thereby reducing resistance loss without compromising the overall light-receiving area.
2Loss of energy
If the thickness of the interconnector is increased to reduce resistance loss, then the resistance loss is reduced, but residual stress in the cell is increased and the probability of cell breakage is increased
Solution Approach 1:
The invention segments the current path by introducing a third bus electrode and dividing the cell into multiple sections. This allows the use of thinner interconnectors with smaller cross-sectional areas, as the current load is distributed across multiple connection points. The reduced thickness minimizes thermal stress during soldering while maintaining adequate electrical conductivity through the distributed configuration.
3Loss of energy
If the width of the interconnector is increased to reduce resistance loss, then the resistance loss is reduced, but the light-receiving area of the cell is reduced
Solution Approach 1:
The invention divides the current path into multiple segments using additional bus electrodes, allowing the use of narrower interconnectors. By distributing the current across multiple parallel paths rather than relying on a single wide interconnector, the light-receiving area is preserved while achieving equivalent or better electrical performance through the segmented configuration.
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 design reduces resistance loss and improves the output of the solar battery module by halving the electric current per cell, making it easier to produce modules with reduced resistance loss and increased yield.
Implementation Method 1
a solar power generation system that converts light energy of the sun and the like into electric energy
Data Source
AI summary
A solar battery module includes: a plurality of solar battery cells, a plain shape of each being a substantial rectangle, and a ratio of a short side length and a long side length of the substantial rectangle being 1/n:1 (n is an integer equal to or larger than 2), includes a plurality of light-receiving-surface bus electrodes parallel to the short side of the substantial rectangle on a light receiving surface, and includes rear-surface bus electrodes each at a position on a non-light-receiving surface corresponding to each of the light-receiving-surface bus electrodes; and a light-receiving-surface lead (an interconnector) that electrically connects the light-receiving-surface bus electrodes of one of the solar battery cells to the rear-surface bus electrodes of adjacent one of the solar battery cells.