Solar Battery Module String Spacing for Uniform Light Distribution
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Solution Overview
Problem
In solar cell modules, the uneven exposure of reflective members leads to a difference in incident light distribution, resulting in reduced short-circuit current (Isc) and increased hot spot probability, particularly at central solar cells compared to those near the ends.
Innovation Solution
The solar cell module design features a wider spacing between adjacent strings at the central portion than at the ends, with a reflective member on the back surface to redistribute incident light, and bridging wiring members to connect strings and enhance light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a reflective member is provided on the back surface side of solar cells to reflect incident light, then light usage efficiency is improved, but the exposure area of the reflective member becomes uneven across different positions, causing non-uniform incident light distribution
Solution Approach 1:
The patent applies local quality by varying the spacing between adjacent strings at different positions within the group. Specifically, the spacing is set to be larger at central portions and smaller at end portions of the group in the longitudinal direction. This local variation in spacing compensates for the positional differences in reflective member exposure area, ensuring that solar cells at different positions receive relatively uniform incident light. The principle directly addresses the non-uniform light distribution problem by creating position-dependent structural parameters.
2Ease of manufacture
If solar cells are arranged with constant spacing to form groups, then manufacturing is simplified, but solar cells at central portions receive less incident light compared to those at end portions, reducing short-circuit current and increasing hot spot risk
Solution Approach 1:
The patent modifies the constant spacing arrangement by introducing position-dependent spacing variations. The spacing between adjacent strings is made larger at central portions of the group and smaller at end portions. This local quality adjustment maintains relatively uniform incident light distribution across all solar cells regardless of their position, thereby ensuring uniform short-circuit current and reducing hot spot risks while still preserving the overall simplicity of the string group structure.
3Ease of operation
If the spacing between end of module and solar cell is made wider than spacing between adjacent strings, then assembly is facilitated, but the exposure area of reflective member at peripheral solar cells becomes excessively large, creating light distribution imbalance
Solution Approach 1:
The patent applies local quality by differentiating spacing at different locations: the spacing between the end of the module and solar cells is set wider to facilitate assembly, while the spacing between adjacent strings is varied positionally (larger at central portions, smaller at end portions). This creates a balanced light distribution system where the wider end spacing is compensated by the position-dependent intermediate spacings, ensuring that no solar cell receives excessively large or small amounts of reflected light.
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 configuration reduces light exposure differences between central and end solar cells, achieving more uniform short-circuit current and minimizing hot spot occurrences.
Implementation Method 1
a reflective member which reflects at least some of incident light are placed on a back surface side of a solar cell
Data Source
AI summary
A solar battery module is provided with a plurality of solar cells, a wiring material for connecting adjacent solar cells in the longitudinal directors to form strings, and a reflective body disposed on the rear-surface side of the solar cells, said body reflecting at least some incident light toward the solar cells. In the solar battery module, the strings are multiply disposed in the horizontal direction to constitute string groups, intervals D20 between adjacent strings being formed wider in the longitudinal center section of the string groups than in the longitudinal end sections.