DE-102024132625-A1 - Solar cell module

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Abstract

The invention relates to a solar cell module with at least a first and a second solar cell string, wherein the first and the second solar cell string each have a plurality of electrically interconnected solar cells, wherein the solar cells of the first solar cell string are arranged in a first row along a first longitudinal extent (L1) and the solar cells of the second solar cell string are arranged in a second row along a second longitudinal extent (L2) parallel to the first longitudinal extent and a terminal first connecting solar cell (1a) of the first solar cell string is electrically connected by means of a string cross connector (2a) of the solar cell module to a terminal second connecting solar cell (1b) of the second solar cell string. It is essential that the string cross connector (2a) is arranged to partially cover the first connecting solar cell (1a), that the string cross connector (2a) is arranged without covering the second connecting solar cell (1b), that at least one string longitudinal connector (4) of the second connecting solar cell is arranged on the second connecting solar cell (1b) such that the string longitudinal connector (4) of the second connecting solar cell partially covers the second connecting solar cell (1b) and projects beyond the second connecting solar cell (1b) in a connection area, and that the string longitudinal connector of the second connecting solar cell (4) is arranged on the string cross connector (2a) in the connection area and is electrically connected to it.

Inventors

Daniel von Kutzleben
Li Carlos Rendler

Assignees

Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein

Dates

Publication Date: 20260513
Application Date: 20241108

Claims (15)

A solar cell module comprising at least a first and a second solar cell string, wherein the first and the second solar cell strings each comprise a plurality of electrically interconnected solar cells, wherein the solar cells of the first solar cell string are arranged in a first row along a first longitudinal extent (L1) and the solar cells of the second solar cell string are arranged in a second row along a second longitudinal extent (L2) parallel to the first longitudinal extent, and a terminal first connecting solar cell (1a) of the first solar cell string is electrically connected to a terminal second connecting solar cell (1b) of the second solar cell string by means of a string cross-connector (2a) of the solar cell module, characterized in that the string cross-connector (2a) is arranged to partially cover the first connecting solar cell (1a), that the string cross-connector (2a) is arranged without covering the second connecting solar cell (1b), and that at least one string longitudinal connector is attached to the second connecting solar cell (1b). (4) the second connecting solar cell is arranged such that the longitudinal string connector (4) of the second connecting solar cell partially covers the second connecting solar cell (1b) and extends beyond the second connecting solar cell (1b) in a connection area and that the longitudinal string connector of the second connecting solar cell (4) is arranged in the connection area on the transverse string connector (2a) and is electrically connected to it.
Solar cell module according to Claim 1 , characterized in that the strand cross-connector (2a) is designed having a longitudinal extension which is arranged transversely to the first longitudinal extension (L1) of the first solar cell strand, in particular that the strand cross-connector (2a) forms an angle with the longitudinal extension (L1) of the first solar cell strand in the range of 70° to 110°, preferably 80° to 100°, in particular 90°.
Solar cell module according to one of the preceding claims, characterized in that the first and second connecting solar cell (1b) are arranged side by side with an offset, preferably with an offset in a range of 1 mm to 30 mm, preferably 5 mm to 15 mm.
Solar cell module according to one of the preceding claims, characterized in that the string longitudinal connector (4) of the second connecting solar cell has a longitudinal extension which is arranged parallel to the second longitudinal extension (L2) of the second solar cell string.
Solar cell module according to one of the preceding claims, characterized in that a plurality of strand longitudinal connectors (4) comprising the strand longitudinal connector (4) of the second connecting solar cell (1b) is arranged on the second connecting cell, wherein each strand longitudinal connector (4) of the second connecting solar cell (1b) is arranged partially covering the second connecting solar cell (1b) and projecting beyond the second connecting solar cell (1b) in a connection area, and that each strand longitudinal connector (4) of the second connecting solar cell (1b) is arranged in the connection area on the strand transverse connector (2a) and is electrically connected to it, in particular that the plurality of strand longitudinal connectors comprises at least 3, in particular at least 12 strand longitudinal connectors (4).
Solar cell module according to Claim 5 , characterized in that each string longitudinal connector (4) of the second connecting solar cell (1b) is designed having a longitudinal extension which is arranged parallel to the second longitudinal extension (L2) of the second solar cell string.
Solar cell module according to one of the preceding claims, characterized in that the strand cross connector (2a) is materially bonded to the first connecting solar cell (1a) by means of adhesive bonding, preferably by means of an electrically conductive adhesive.
Solar cell module according to Claim 7 , characterized in that the strand cross connector (2a) is designed as a multilayer element which has an electrically conductive substrate which is coated at least partially, preferably over the entire surface of at least one side, with an electrically conductive adhesive.
Solar cell module according to Claim 8 , characterized in that the electrically conductive substrate is formed as a metal substrate, in particular as a copper-containing layer, preferably as a copper layer.
Solar cell module according to one of the preceding claims, characterized in that the string cross connector (2a) is arranged directly on a side, preferably on a rear side of the first connecting solar cell (1a).
Solar cell module according to one of the Claims 1 until 9 , characterized in that at least one intermediate connector (7), preferably a plurality of intermediate connectors (7), is arranged between the first connecting solar cell (1a) and the string cross connector (2a) and the string cross connector is electrically connected to the first connecting solar cell (1a) by means of the intermediate connector(s) (7).
Solar cell module according to one of the preceding claims, characterized in that the first solar cell string has a terminal third connecting solar cell (1c) and the second solar cell string has a terminal fourth connecting solar cell (1d), that at least one further string longitudinal connector (4) of the third connecting solar cell (1c) is arranged on the third connecting solar cell (1c) such that the further string longitudinal connector (4) of the third connecting solar cell (1c) partially covers the third connecting solar cell (1c) and projects beyond the third connecting solar cell (1c) in a connection area, that the solar cell module has, in addition to the string transverse connector (2a) as the first string transverse connector (2a), a second and a third string transverse connector (2b, 2c), wherein the second string transverse connector (2b) is arranged in the connection area on the further string longitudinal connector (4) of the third connecting solar cell (1c) and is electrically conductively connected to it, and wherein the third strand cross connector (2c) is arranged partially covering the fourth connecting solar cell (1d) and is electrically connected to it.
Solar cell module according to Claim 12 , characterized in that a bypass element (5), in particular a bypass diode, is arranged between the second and third cross-connectors (2b, 2c).
Solar cell element after a Claims 12 until 13 , characterized in that the second and third strand cross connectors (2b, 2c) are designed to have a longitudinal extension, wherein the longitudinal extensions of the second and third strand cross connectors (2b, 2c) are arranged parallel to the longitudinal extension of the first strand cross connector (2a).
Solar cell element according to Claim 14 , characterized in that the second and third strand cross connectors (2b, 2c) are arranged along a common straight line (L3).

Description

The present invention relates to a solar cell module according to claim 1. Solar cell modules typically consist of multiple solar cell strings, each string comprising multiple solar cells that are typically connected in series. The solar cell strings are typically arranged parallel to one another and connected in parallel or in series using string connectors. Copper strips with solder coating are typically used as connectors. The connectors are joined to the solar cell strings using a soldering process with infrared lamps, induction, or contact soldering. The arrangement and electrical connection of the solar cells in a module directly affects the area utilization and thus the efficiency per total module area. It is therefore an object of the present invention to provide a solar cell module which enables a more compact design, so that a larger proportion of the total area of the solar cell module is covered by the solar cells. This problem is solved by a solar cell module according to claim 1. Advantageous embodiments are found in the dependent claims. The solar cell module according to the invention comprises at least a first and a second solar cell string, wherein the first and the second solar cell string each comprise a plurality of electrically interconnected solar cells. The solar cells of the first solar cell string are arranged in a first row along a first longitudinal extent, and the solar cells of the second solar cell string are arranged in a second row along a second longitudinal extent parallel to the first longitudinal extent. A terminal first connecting solar cell of the first solar cell string is electrically connected to a terminal second connecting solar cell of the second solar cell string by means of a string cross connector of the solar cell module. It is essential that the string cross-connector is arranged to partially overlap the first connecting solar cell, and that the string cross-connector is arranged without overlapping the second connecting solar cell, wherein at least one string longitudinal connector of the second connecting solar cell is arranged on the second connecting solar cell such that the string longitudinal connector of the second connecting solar cell partially overlaps the second connecting solar cell and projects beyond the second connecting solar cell in a connection area. The string longitudinal connector of the second connecting solar cell is arranged on the string cross-connector in the connection area and is electrically connected to it. The solar cell module according to the invention has the advantage over previously known arrangements of solar cells in a solar cell module that the string cross-connector is arranged to overlap the first connecting solar cell. This results in the advantage of a reduction in the overall length of the interconnection structure, since the string cross-connector is not arranged in the direction of the longitudinal extent of the first solar cell string next to the first connecting solar cell, as is known from the prior art, but rather is arranged to overlap the first connecting solar cell. This results in increased area utilization of the solar cell module and thus, compared to the prior art, a higher area-to-surface ratio of the solar cell area relative to the total area of the solar cell module, thereby increasing the efficiency relative to the total area of the solar cell module. In an advantageous embodiment, the string cross-connector is designed to have a longitudinal extension which is arranged transversely to the first longitudinal extension of the first solar cell string. In particular, it is advantageous that the string cross-connector (2a) forms an angle with the longitudinal extension of the first solar cell string in the range of 70° to 110°, preferably 80° to 100°, and particularly 90°. An arrangement of the string cross-connector transverse to the first longitudinal extent of the first solar cell string, in particular perpendicular to the first longitudinal extent of the first solar cell string, enables a compact arrangement of the solar cells, especially in the case of parallel solar cell strings arranged next to each other. In previously known solar cell modules, the solar cells are arranged on grid points of a regular, rectangular grid, so that the solar cells of a solar cell string are arranged along a straight line and also perpendicular to the longitudinal extent of the parallel solar cell strings, the solar cells are arranged next to each other on a straight line. The solar cell module according to the present invention has the special feature that the The string cross-connector is arranged so that it partially overlaps the first connecting solar cell and is free from overlapping the second connecting solar cell, i.e., it does not overlap the second connecting solar cell. An advantageous embodiment achieves this arrangement of the string cross-connector in a simple and compact manner, in which the first and