Back contact photovoltaic module and photovoltaic system

By optimizing the cell stacking design of back-contact photovoltaic modules, the problems of hidden cracks, light leakage, and edge chipping in the stacking arrangement have been solved, improving the power generation efficiency and stability of the modules and achieving higher power generation per unit area and lower production costs.

CN121099780AActive Publication Date: 2025-12-09TIANJIN AIKO SOLAR ENERGY TECH CO LTD +4
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Patent Information

Application Number
CN202511631455.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-10
Publication Date
2025-12-09
Estimated Expiration
2045-11-10

AI Technical Summary

Technical Problem

Traditional back-contact photovoltaic modules, when stacked, are prone to microcracks, light leakage, and edge defects during the lamination process, and the power generation per unit area of ​​the module is limited.

Method used

The cell design employs partial overlap to ensure that the ratio of the width of the overlap area between cells to the length of the cell is between 0.25% and 3.5%. The cell overlap method is optimized so that the straight edges are covered by the chamfered edges, and the cells are also partially overlapped to eliminate gaps, forming a stable stacked structure.

Benefits of technology

It increases the effective light-receiving area and power generation per unit area of ​​photovoltaic modules, reduces the risk of microcracks, light leakage and edge damage, improves the CTM value of modules and reduces production costs.

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Abstract

The invention discloses a back contact photovoltaic module and a photovoltaic system, and relates to the technical field of solar cells. The back contact photovoltaic module comprises a plurality of battery strings which are arranged in the first direction and electrically connected, each battery string comprises a plurality of battery pieces which are arranged in the second direction and electrically connected, and the first direction and the second direction are arranged in a crossed mode; in the same battery string, two adjacent battery pieces are partially overlapped to form an inter-piece overlapping area; and in the second direction, the ratio of the width of the inter-piece overlapping region to the length of a single battery piece is 0.25%-3.5%. According to the back contact photovoltaic module, the risks of subfissure, light leakage and edge collision of the battery piece in the packaging process can be reduced, and the module power is improved to the maximum extent.
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