Photovoltaic Module Lead-Out Structure for Cell-String Short-Circuit Spacing
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Solution Overview
Problem
The risk of short circuits between cell strings in photovoltaic modules due to insufficient distance between lead wires connected to diodes in back-contact photovoltaic modules, which is exacerbated by the increasing number of main grids and reduced distances between lead-out portions.
Innovation Solution
A photovoltaic module design featuring a lead-out structure with a first connecting portion parallel to the main body and a second connecting portion extending out, positioned close to the edge of the main body, maintaining a distance of 2mm to 20mm between the second connecting portion and the edge, ensuring adequate spacing to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of main grids is increased to improve power generation efficiency, then the power generation efficiency is improved, but the distance between lead-out portions is reduced, increasing the risk of short circuits
Solution Approach 1:
The lead-out structure transitions from a planar arrangement to a three-dimensional configuration by extending the second connecting portion outward from the main body portion. This spatial extension increases the distance between adjacent lead wires in the thickness direction, effectively preventing short circuits while allowing increased number of main grids for higher power generation efficiency.
2Reliability
If the distance between lead wires is increased to prevent short circuits, then the reliability is improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The lead-out structure is segmented into distinct functional portions: a main body portion for mounting and a second connecting portion extending outward for connection. This segmentation allows each portion to be optimized independently - the main body maintains compactness while the extending portion provides safe spacing, thus preventing short circuits without excessive complexity.
3Ease of manufacture
If a simple lead-out structure is used to reduce manufacturing complexity, then the ease of manufacture is improved, but the distance between lead wires is insufficient, increasing short circuit risk
Solution Approach 1:
The lead-out structure changes the spatial parameter of lead wire separation by extending the second connecting portion outward. This parameter change (increasing distance in the thickness direction) effectively reduces short circuit risk while maintaining manufacturing simplicity through a straightforward structural extension that can be integrated into existing manufacturing processes.
Data Source
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AI summary
The embodiments of the present application relate to the photovoltaic field, and in particular, to a photovoltaic module. The photovoltaic module includes at least one cell unit group, where the cell unit group includes multiple cell strings connected in series and/or in parallel, and adjacent cell strings in the multiple cell strings are connected by a connection structure. The connection structure includes a lead-out structure, and the lead-out structure includes a main body portion, a first connecting portion and a second connecting portion that are arranged on the main body portion; the first connecting portion is connected to the second connecting portion, the first connecting portion is disposed in parallel to a length direction of the main body portion, and the second connecting portion extends out of the first connecting portion. In the length direction of the main body portion, the main body portion has a first edge, the first connecting portion is closer to the first edge than the second connecting portion. In the embodiments of the present application, the second connecting portion is provided on the lead-out structure, and there is a distance between the second connecting portion and the edge of the main body portion of the lead-out structure, so that there is a distance between two second connecting portions respectively connected to two ends of the diode, so as to avoid the risk of short circuit between cell strings.