Preparation method of copper-clad aluminum reflective bus bar and photovoltaic module

Abstract

The present invention discloses a preparation method of a copper-clad aluminum reflective bus bar and a photovoltaic module. The bus bar body includes a base layer and a tin layer. The base layer includes an aluminum substrate and a copper layer wrapped on the outer surface of the aluminum substrate. The light incident surface of the bus bar body is a serrated structure. Its preparation process is as follows: Step 1, wrap a copper strip on the surface of an aluminum core; Step 2, weld the butt joint of the copper strip by argon arc welding to form a wrapped structure; Step 3, roll the copper-clad aluminum substrate in Step 2 through a rolling mill for reflective pattern rolling to form serrated reflective patterns on one of its surfaces; Step 4: heat-treat the product after rolling in Step 3; Step 5, coat the surface of the product after heat treatment in Step 4 with a soldering flux; Step 6, tin-plate by hot dip plating process; Step 7, cool and wind up. Through the design of the reflective surface pattern, the present invention realizes the improvement of the overall power of the photovoltaic module by increasing the effective utilization rate of light per unit area of the photovoltaic module.

Description

Technical Field

[0001] The present invention relates to the field of solder tapes, and particularly to a preparation method of a copper-clad aluminum reflective bus bar and a photovoltaic module. Background Art

[0002] The photovoltaic solder tape is one of the key components in the production process of photovoltaic modules, mainly used for welding between solar panels in photovoltaic modules. Currently, most solder tapes are formed by plating tin on the surface of a pure copper core. In a photovoltaic module, the bus bar is generally distributed beside the photovoltaic cell string, and the area it occupies is the ineffective area where no photocurrent can be generated inside the photovoltaic module.

[0003] For the reflective bus bar, a certain reflective texture is prepared on the surface of the bus bar. Through the directional reflection of the surface texture, the light incident on the surface of the bus bar is reflected to the glass-air interface, and then through the total reflection of the light at the glass-air interface, the incident light is reflected to the surface of the adjacent solar cell to generate additional photocurrent, thus realizing the reuse of the incident light. However, the current reflective bus bars have a flat structure on both sides, resulting in low reflection efficiency.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a preparation method of a copper-clad aluminum reflective bus bar with high light source utilization rate and a photovoltaic module.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a preparation method of a copper-clad aluminum reflective bus bar, including a bus bar body, the bus bar body includes a base layer and a tin layer, the base layer includes an aluminum substrate and a copper layer wrapped on the outer surface of the aluminum substrate, and the light incident surface of the bus bar body is a serrated structure. Its preparation process is as follows:

[0007] Step 1: Wrap a copper strip around the surface of an aluminum core;

[0008] Step 2: Weld the butt joint of the copper strip by argon arc welding to form a wrapped structure;

[0009] Step 3: Roll the copper-clad aluminum substrate obtained in Step 2 through a rolling mill to roll a reflective texture, so that one of its surfaces forms a serrated reflective texture;

[0010] Step 4: Heat-treat the product after rolling in Step 3;

[0011] Step 5: Coat the surface of the product heat-treated in Step 4 with a soldering flux;

[0012] Step 6: Tin-plate by hot dip plating process;

[0013] Step 7: Cool and wind up.

[0014] Furthermore, the calender comprises an upper calendering roller and a lower calendering roller, and a surface of the upper calendering roller is provided with a plurality of serrated protrusions.

[0015] Furthermore, the included angle of the saw teeth is 30° to 90°.

[0016] Furthermore, the thickness of the tin layer is 0.03 mm to 0.05 mm.

[0017] Furthermore, the tin layer is generally a binary or multi-component tin alloy such as tin-lead, tin-silver-copper, tin-indium, tin-bismuth-lead, or tin-bismuth-silver.

[0018] The present invention also discloses a photovoltaic module, comprising the busbar body described above, comprising an upper glass plate, a first EVA layer and a lower glass plate arranged in sequence from top to bottom, a second EVA layer arranged on the lower glass plate, a plurality of battery cells that have been string-welded are arranged on the second EVA layer by a string-swinging machine, and also comprising a middle busbar arranged between the battery cells at intervals, a left busbar arranged at the far left end, and a right busbar arranged at the far right end;

[0019] The sawtooth structure on the surface of the left busbar is a right triangle with the sawtooth slope inclined to the right;

[0020] The sawtooth structure on the surface of the right busbar is a right triangle with the sawtooth slope inclined to the left;

[0021] The serrated structure on the surface of the middle bus bar is an isosceles triangle.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention improves the process and designs the reflective surface texture, thereby increasing the effective utilization rate of light per unit area of the photovoltaic module, thereby improving the overall power of the photovoltaic module.

[0024] 2. Through the special design of the bus bars on the left and right sides, the light entering the module is increased, thereby improving the overall power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the photovoltaic module structure.

[0026] Marked in the figure are: upper glass plate 1, first EVA layer 2, lower glass plate 3, battery cell 4, middle bus bar 5, left bus bar 6, right bus bar 7, and second EVA layer 8. DETAILED DESCRIPTION

[0027] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be provided in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present simultaneously.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] An embodiment of the present application discloses a preparation method of a copper-clad aluminum reflective bus bar, including a bus bar body. The bus bar body includes a base layer and a tin layer. The base layer includes an aluminum substrate and a copper layer wrapped on the outer surface of the aluminum substrate. The light-incident surface of the bus bar body is a serrated structure, and its preparation process is as follows:

[0031] Step 1: Wrap a copper strip on the surface of an aluminum core.

[0032] Step 2: Weld the butt joint of the copper strip by argon arc welding to form a wrapped structure.

[0033] Step 3: Roll the copper-clad aluminum substrate obtained in Step 2 through a rolling mill to roll a reflective pattern, so that one surface thereof forms a serrated reflective pattern.

[0034] Step 4: Heat-treat the product rolled in Step 3.

[0035] Step 5: Coat a soldering flux on the surface of the product heat-treated in Step 4.

[0036] Step 6: Tin-plate by hot-dip plating process.

[0037] Step 7: Cool and wind up.

[0038] This process uses copper-clad aluminum as the base material. One side of the bus bar forms grooves through special embossing, and the other side is smooth. The effective utilization rate of the incident light per unit area of the photovoltaic module is improved through the special grooves, thereby achieving the effect of increasing the power of the module.

[0039] Specifically, the calender used above includes an upper calender roll and a lower calender roll. A plurality of serrated protrusions are provided on the surface of the upper calender roll, and the shape of the serrated protrusions is adapted to the shape of the serrated structure on the light incident surface of the bus bar body.

[0040] The design of the above-mentioned upper calender roll realizes the rapid calendering of the shape of the bus bar body, and this structure is simple in structure and convenient to use.

[0041] Specifically, the included angle of the serrations is 30° to 90°, and specifically can be 30°, 50°, 70°, 90°, etc.

[0042] Specifically, the thickness of the tin layer is 0.03 mm to 0.05 mm, and specifically can be 0.03 mm, 0.04 mm, 0.05 mm, etc.

[0043] Specifically, the tin layer is generally a binary or multi-component tin-based alloy such as tin-lead, tin-silver-copper, tin-indium, tin-bismuth-lead, tin-bismuth-silver, etc.

[0044] As Figure 1 shown, the present invention also discloses a photovoltaic module, which includes an upper glass plate 1, a first EVA layer 2, and a lower glass plate 3 arranged in sequence from top to bottom. A second EVA layer 8 is provided on the lower glass plate 3. A plurality of battery cells 4 that are well string-soldered are provided on the second EVA layer 8 through a stringing machine. It also includes an intermediate bus bar 5 arranged at intervals between the battery cells 4, a left bus bar 6 arranged at the leftmost end, and a right bus bar 7 arranged at the rightmost end;

[0045] The surface serrated structure of the left bus bar 6 is a right triangle with the serrated slope inclined to the right;

[0046] The surface serrated structure of the right bus bar 7 is a right triangle with the serrated slope inclined to the left;

[0047] The surface serrated structure of the intermediate bus bar 5 is an isosceles triangle.

[0048] In the above structure, due to the special design of the left bus bar 6 and the right bus bar 7, the left bus bar 6 can reflect all the light in the right direction, and the right bus bar 7 can reflect all the light in the left direction, thereby reducing the waste of light energy and improving the overall power of the photovoltaic module.

[0049] The above specific embodiments have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A photovoltaic module, comprising a bus bar body, characterized in that: It includes an upper glass plate (1), a first EVA layer (2), and a lower glass plate (3) arranged successively from top to bottom. A second EVA layer (8) is provided on the lower glass plate (3). A plurality of soldered cells (4) are provided on the second EVA layer (8) by a stringing machine. It further includes an intermediate bus bar (5) arranged at intervals between the cells (4), a left bus bar (6) arranged at the leftmost end, and a right bus bar (7) arranged at the rightmost end. The surface serrated structure of the left bus bar (6) is a right-angled triangle with the serrated slope inclined to the right. The surface serrated structure of the right bus bar (7) is a right-angled triangle with the serrated slope inclined to the left. The surface serrated structure of the intermediate bus bar (5) is an isosceles triangle. The bus bar body includes a base layer and a tin layer. The base layer includes an aluminum substrate and a copper layer wrapped on the outer surface of the aluminum substrate. The light-incident surface of the bus bar body is a serrated structure, and its manufacturing process is as follows. Step 1: Wrap the copper strip on the surface of the aluminum core. Step 2: Weld the butt joint of the copper strip by argon arc welding to form a wrapped structure. Step 3: Roll the copper-clad aluminum substrate in Step 2 through a rolling mill to form a serrated reflective pattern on one of its surfaces. Step 4: Heat-treat the product after rolling in Step 3. Step 5: Coat the surface of the product heat-treated in Step 4 with a soldering flux. Step 6: Tin-plate by hot-dip plating process. Step 7: Cool and wind up. The rolling mill includes an upper rolling roll and a lower rolling roll. A plurality of serrated protrusions are provided on the surface of the upper rolling roll. The included angle of the serrations is 30° - 90°. The thickness of the tin layer is 0.03 mm - 0.05 mm. The tin layer is a tin-lead, tin-silver-copper, tin-indium, tin-bismuth-lead, or tin-bismuth-silver solder alloy.

Images