Solar Cell Welding Spot Layout for Stronger Passivation Bonding
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Solution Overview
Problem
Existing solar cells face issues with weak bonding tensile force between doped layers and passivation film layers at welding spots, leading to potential detachment during welding, which affects welding reliability.
Innovation Solution
The solar cell design includes second doped layers arranged on first preset zones, covered by a passivation film layer, with first welding spots overlapping these second doped layers, enhancing bonding tensile force and improving welding reliability by using doped layers with opposite polarity and controlled roughness to increase adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding spots are arranged on the passivation film layer, then welding connections can be established, but the bonding tensile force is weak causing detachment during welding
Solution Approach 1:
The patent applies local quality by creating second doped layers with opposite polarity specifically at the welding spot locations on the passivation film layer. These localized doped regions provide enhanced bonding strength precisely where welding occurs, while the rest of the passivation film maintains its protective function. The orthographic projections of welding spots overlapping with second doped layers ensures that the enhanced bonding property is applied only where needed.
Solution Approach 2:
The patent employs composite material structure by combining the passivation film layer with underlying doped layers of opposite polarity. This composite structure integrates the protective properties of the passivation film with the high bonding strength of the doped layers, creating a multi-functional layer system that simultaneously provides protection and strong welding attachment.
2Reliability
If second doped layers are added to enhance bonding strength, then welding reliability improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by forming the second doped layers during the existing cell manufacturing process, before the welding step. The doped layers are prepared in advance on the passivation film layer, so that when welding occurs, the enhanced bonding structure is already in place. This eliminates the need for additional complex welding preparation steps.
Solution Approach 2:
The second doped layers serve multiple functions: they provide enhanced bonding strength for welding, maintain electrical isolation through the passivation film, and can be integrated with the existing doped layer structure. This multi-functionality reduces the need for separate components and simplifies the overall device architecture despite the added functionality.
Data Source
AI summary
The disclosure provides a solar cell, a cell component, and a photovoltaic system. The solar cell includes a silicon substrate, first doped layers, second doped layers, a first passivation film layer, and first welding spots. The silicon substrate has a first surface and a second surface opposite each other. The first doped layers are arranged on the first surface. The first doped layers each have several first preset zones. The several second doped layers are arranged on the first preset zones, and the second doped layers are arranged in a spaced manner. The first passivation film layer is arranged on the second doped layers and the first doped layers. The first welding spots are arranged on the first passivation film layer. Orthographic projections of the first welding spots on the first doped layers at least partially overlap orthographic projections of the second doped layers on the first doped layers.