Solar Cell Grid Line Segmentation to Cut Shading Loss
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Solution Overview
Problem
Existing solar cell manufacturing methods face a trade-off between electron loss due to long carrier paths and ribbon-induced shading, limiting performance improvement with conventional ribbons.
Innovation Solution
A solar cell design featuring disconnected grid line sets and increased ribbons, with special-shaped segments and internal core layers, to reduce shading and shorten carrier paths, enhancing light absorption and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a large number of ribbons are used for the cells, then the electron loss is reduced, but the ribbons cause significant shielding to the cells
Solution Approach 1:
The continuous grid lines are divided into multiple disconnected grid line sets. Each grid line set contains a portion of the total ribbons (e.g., 13 ribbons out of 26 total), and grid lines in adjacent grid line sets are disconnected. This segmentation allows the ribbons to be distributed across multiple sets rather than concentrated in a single continuous line, reducing the shielding effect on any one cell region while maintaining effective electron collection across the entire cell surface.
Solution Approach 2:
The patent transitions from a single-dimensional continuous grid line structure to a multi-dimensional arrangement with multiple disconnected grid line sets. By organizing ribbons into separate sets that are disconnected in space, the system creates a more distributed three-dimensional configuration that reduces local shielding while maintaining overall electron collection efficiency.
2Reliability
If no more than 28 ribbons are disposed at continuous grid lines, then a relative balance is achieved between shielding and electron loss, but the performance of the cells cannot be further improved
Solution Approach 1:
The patent segments the ribbon configuration into multiple grid line sets (e.g., two sets with 13 ribbons each, totaling 26 ribbons). This segmentation allows for optimized electron collection by reducing carrier path lengths to nearby ribbons while distributing the shielding effect across multiple disconnected sets, thereby improving overall cell performance beyond the conventional 28-ribbon limit.
Solution Approach 2:
The patent changes the structural parameters of the grid line configuration by introducing disconnected grid line sets with specific ribbon counts (e.g., 13 ribbons per set). This parameter change optimizes the balance between shielding and electron collection, enabling performance improvement while using fewer total ribbons than the conventional 28-ribbon configuration.
3Ease of manufacture
If continuous grid lines are used, then the manufacturing is simpler, but the grid lines cause shielding and reduce light absorption area
Solution Approach 1:
The continuous grid lines are segmented into multiple disconnected grid line sets. Each set contains a specific number of ribbons (e.g., 13 ribbons per set), and the grid lines between sets are disconnected. This segmentation reduces the total light absorption area blocked by grid lines compared to continuous lines, while the manufacturing process remains relatively simple by maintaining the basic grid line structure with discontinuities.
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 design improves solar cell performance by reducing shading and electron loss, increasing light absorption, and maintaining consistent performance across the cell area.
Implementation Method 1
solar cell, including: a plurality of cells, where each of the cells includes a plurality of grid line sets arranged side by side
Data Source
AI summary
The present disclosure relates to the technical field of solar cells, and provides a solar cell. The solar cell may include a plurality of cells and a plurality of ribbons. Each cell includes a plurality of grid line sets arranged side by side along a first preset direction, each grid line set includes a plurality of grid lines of a preset length arranged in parallel along a second preset direction, and the grid lines in two adjacent grid line sets are disconnected, where the first preset direction is perpendicular to the second preset direction. Each ribbon connects the plurality of cells to one another in series and is soldered to all the grid lines in one grid line set of one cell. According to the present disclosure, the plurality of grid line sets are disposed at the cell, and the grid lines between the grid line sets are disconnected from each other, which can save an amount of grid line paste and costs. In addition, compared with continuous grid lines, the disconnected grid lines between the grid line sets reduce shielding of the cell, and increase a light absorption area of the cell, thereby improving the performance of the cell.