High-reliability photovoltaic module and system

Abstract

The invention discloses a high-reliability photovoltaic module and system, and belongs to the technical field of photovoltaics, and the photovoltaic module comprises a positive electrode wiring terminal, a negative electrode wiring terminal and two groups of photovoltaic units. Each group of photovoltaic units comprises a battery unit, a bus bar and two diodes; one diode is connected between the bus bar and the cathode of the battery unit; the other diode is connected between the bus bar and the positive electrode of the battery unit; the bus bars are connected with the battery units; the two battery units are connected in series; the anode wiring terminal is connected with one of the bus bars; and the negative wiring terminal is connected with the other bus bar. The power generation loss of the photovoltaic module when hot spots occur is reduced, and the electric energy output power of the photovoltaic module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, in particular to a high-reliability photovoltaic module and system. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The cell arrangement of the existing three-fraction photovoltaic module is usually a long string through the long side of the module, and the circuit design is three strings in parallel and then in series. In order to prevent the hot spot effect caused by the shading of solar cells, a bypass diode is usually connected in parallel at the positive and negative ports of the photovoltaic module.

[0004] In the related art, three bypass diodes are used for a photovoltaic module by using a jumper, and the jumper is arranged at the interval of the cell string. When one of the three bypass diodes is connected in reverse breakdown, a short circuit is formed between the positive and negative poles of the photovoltaic module through the wire connected to the bypass diode, thereby reducing the risk of fire. However, the 1 / 3 of the cell pieces bypassed will no longer generate electricity, resulting in a 1 / 3 loss of output power of the photovoltaic module, which causes a large loss of power generation of the photovoltaic module. In addition, the jumper is arranged between two cell strings, and the reflection effect of the metal material is much lower than that of the customized reflection material, resulting in a reduction in output power. SUMMARY

[0005] In order to solve the above problems, the present application provides a high-reliability photovoltaic module and system, which reduces the power generation loss of the photovoltaic module when the hot spot occurs, and improves the electrical energy output power of the photovoltaic module.

[0006] To achieve the above object, the present application adopts the following technical scheme: In a first aspect, the present application provides a high-reliability photovoltaic module, comprising: a positive terminal, a negative terminal, and two groups of photovoltaic units. Each group of photovoltaic units comprises a cell unit, a busbar, and two diodes. One of the diodes is connected between the busbar and the negative pole of the cell unit, and the other diode is connected between the busbar and the positive pole of the cell unit. The busbar is connected to the cell unit. The two groups of cell units are connected in series. The positive terminal is connected to one of the busbars, and the negative terminal is connected to the other busbar.

[0007] Further, the two diodes in the photovoltaic unit are placed in the same terminal box.

[0008] Further, the cell unit is mounted on a back plate, and two mounting holes are provided on the back plate. The diodes are connected with the battery units through the jumpers; Two battery units are located on one side of the back plate, and four diodes are located on the other side of the back plate. The jumper and the busbar of one of the photovoltaic units are connected with two diodes of the photovoltaic unit after passing through one of the mounting holes. The jumper and the busbar of the other photovoltaic unit are connected with two diodes of the photovoltaic unit after passing through the other mounting hole.

[0009] Further, the jumper includes a jumper body and a jumper extension end. The jumper extension end is connected with the second end of the jumper body, and the jumper extension end is vertically arranged with the second end of the jumper body, the jumper body is located between the back plate and the battery unit, the first end of the jumper body is connected with the battery unit, and the jumper extension end is connected with the diode after extending out of the mounting hole.

[0010] Further, the busbar includes a busbar body and a lead-out end, the busbar body is connected with the battery unit, the lead-out end is connected with the busbar close to the position of the jumper, and the lead-out end is perpendicular to the busbar body, the busbar body is located between the back plate and the battery unit, and the lead-out end is connected with the diode after extending out of the mounting hole.

[0011] Further, the distance between the two busbars and the negative electrode of the connected battery unit is different.

[0012] Further, an insulating layer is arranged between the jumper and the battery unit.

[0013] Further, the installation directions of the two diodes in the photovoltaic unit are opposite.

[0014] Further, the battery unit includes a plurality of parallel battery strings, and each battery string includes a plurality of series-connected battery units.

[0015] In the second aspect, the application further provides a photovoltaic system comprising the high-reliability photovoltaic module.

[0016] Compared with the prior art, the application has the following beneficial effects: The high-reliability photovoltaic module and system provided by the application has four bypass diodes arranged therein, which divides the photovoltaic module into four equal parts, so that when hot spot occurs in one part, the photovoltaic module only loses 1 / 4 of the power generation capacity, thereby improving the power generation capacity of the photovoltaic module when hot spot occurs.

[0017] In the photovoltaic module, the jumper and the busbar are arranged on the back surface of the battery unit, the insulating strip has lower requirements for weather resistance and cross-linking with the positive back surface adhesive film, and thinner materials can be selected, so that the material selection space is larger, the cost is reduced, and the power generation capacity of the photovoltaic module is improved.

[0018] The photovoltaic module's backsheet only requires two mounting holes, which improves the module's load-bearing capacity.

[0019] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0021] Figure 1 This is a circuit design diagram of a high-reliability photovoltaic module proposed in this invention; Figure 2 This is a circuit design diagram for a three-section photovoltaic module in related technologies; Figure 3 This diagram shows the location of jumpers in related technologies. Figure 4 This is a diagram showing the location of the jumpers and busbars proposed in this invention; Figure 5 This is a top view of the connection between the jumper and the busbar proposed in this invention; Figure 6 This is a first side view of the connection between the jumper and the busbar proposed in this invention; Figure 7 This is a second side view of the connection between the jumper and the busbar proposed in this invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] First, the application scenarios of a high-reliability photovoltaic module proposed in this invention will be described.

[0026] The existing three-fraction photovoltaic module cell arrangement is usually in a long string through the long side of the module, and the circuit design is three strings in parallel and then in series. In order to prevent the hot spot effect caused by the shading of solar cells, a bypass diode is usually connected in parallel at the positive and negative ports of the photovoltaic module.

[0027] In the related art, three bypass diodes are arranged on a photovoltaic module by using a jumper, and the jumper is arranged at the interval of the cell string.

[0028] As shown in the prior art, Figure 2 When three bypass diodes are arranged on the photovoltaic module, three holes need to be opened on the back glass of the photovoltaic module for installing the positive and negative terminal and the bypass diode; three diodes, one of which is installed in a separate box, and the other two are integrated in the positive and negative terminal box. The following disadvantages exist: a, the number of holes on the back glass is large, the load bearing capacity is reduced, and the risk of damage to the module is increased; b, three bypass diodes, when the module has a hot spot, the power loss is 1 / 3 after the diode is turned on, and the proportion is large.

[0029] As shown in the prior art, Figure 3 The jumper is arranged between two cell strings, and the reflection effect of the metal material is much lower than that of the customized reflective material, resulting in a decrease in output power. In addition, the requirement for the insulating strip placed between the strings is good weather resistance (long-term outdoor light yellowing, which affects the reflection effect of the metal material, etc.), and good crosslinking with the front adhesive film. Therefore, the requirement for the insulating strip itself is high, resulting in high material cost, which is not conducive to cost reduction and efficiency improvement.

[0030] In order to reduce the power loss of the photovoltaic module when the hot spot occurs, and improve the load bearing capacity and power output of the photovoltaic module, an embodiment of the present application provides a high-reliability photovoltaic module, as shown in the prior art, Figure 1 comprising: a positive terminal, a negative terminal, and two groups of photovoltaic units; Each group of photovoltaic units comprises a cell unit, a bus bar, and two diodes; one of the diodes is connected between the bus bar and the negative electrode of the cell unit; the other diode is connected between the bus bar and the positive electrode of the cell unit; the bus bar is connected with the cell unit; The two groups of cell units are connected in series; The positive terminal is connected with one of the bus bars; and the negative terminal is connected with the other bus bar.

[0031] The high-reliability photovoltaic module provided by the embodiment of the present application comprises two photovoltaic units, and two diodes are arranged for each photovoltaic unit, so that the photovoltaic module is divided into four parts. When a hot spot occurs, the photovoltaic module loses 1 / 4 of the power generation capacity, thereby reducing the power generation loss when the hot spot of the photovoltaic module occurs, and improving the power generation capacity when the hot spot of the photovoltaic module occurs.

[0032] In some embodiments, the battery unit comprises a plurality of parallel battery strings, each battery string comprising a plurality of series-connected battery cells.

[0033] In some embodiments, the battery unit adopts three-split battery strings, three battery strings are connected in parallel to form a small battery unit, and two small battery units are connected in series to form a basic connection circuit of the photovoltaic module battery unit.

[0034] In some embodiments, the two diodes in the photovoltaic unit are installed in opposite directions.

[0035] As shown in Figure 1 , the positive electrode of one diode in the photovoltaic unit is connected to the negative electrode of the battery unit, and the negative electrode of the diode is connected to the busbar in the photovoltaic unit; the positive electrode of the other diode is connected to the busbar in the photovoltaic unit, and the negative electrode of the diode is connected to the positive electrode of the battery unit in the photovoltaic unit, and the busbar is located at the middle position of the length direction of the photovoltaic unit, thereby evenly dividing one photovoltaic unit into two parts, when one part occurs hot spot, only the power generation of the part is lost, and the power output power of the photovoltaic module when hot spot occurs is improved.

[0036] In some embodiments, the distance between the two busbars and the negative electrode of the connected battery unit is different.

[0037] Therefore, there is a potential difference between the two busbars, which is beneficial to improve the output efficiency of the photovoltaic module.

[0038] In some embodiments, the battery unit is installed on the back plate; two mounting holes are arranged on the back plate; The diodes are connected to the battery unit through the jumper wires; Two battery units are located on one side of the back plate, and four diodes are located on the other side of the back plate; The jumper wire and the busbar of one photovoltaic unit pass through one mounting hole and are connected to the two diodes of the photovoltaic unit; The jumper wire and the busbar of the other photovoltaic unit pass through the other mounting hole and are connected to the two diodes of the photovoltaic unit.

[0039] Jumper wire: the function is consistent with that of the busbar, which is used for transmitting current; the size of the current transmitted by the jumper wire and the busbar in the embodiment of the application is consistent, and they are all on the back of the battery, so the model is consistent, and the name can also be unified; the jumper wire and the busbar are arranged on the back of the battery unit, an insulating layer is arranged between the jumper wire and the battery unit, the requirements of the insulating layer on weather resistance and crosslinking with the positive back film are lower, a thinner material can be selected, the material selection space is larger, and the cost is reduced; a reflective material is arranged between the battery strings of the battery unit, thereby improving the electric energy output power of the photovoltaic module.

[0040] Furthermore, the backplate of this embodiment only requires two mounting holes, which improves the load-bearing capacity of the component.

[0041] like Figure 4 As shown in the diagram, the green line represents a jumper wire; the yellow line represents the insulation layer.

[0042] The jumper wire in this embodiment of the invention has a thickness of 0.14mm to 0.23mm and a width of 8mm to 13mm. Furthermore, the distance between the jumper wire and the nearest long side of the battery cell is 1 / 10 of the length of the short side of the photovoltaic module.

[0043] The insulation layer has a thickness of 0.1mm to 0.2mm and a width of 10mm to 15mm.

[0044] In some embodiments, the two diodes in the photovoltaic unit are placed in the same junction box.

[0045] This invention requires only two junction boxes, which increases power output while reducing costs.

[0046] like Figures 5-7 As shown, the jumper includes a jumper body and a jumper extension end; The jumper extension is connected to the second end of the jumper body, and the jumper extension is perpendicular to the second end of the jumper body. The jumper body is located between the backplate and the battery cell. The first end of the jumper body is connected to the battery cell. The jumper extension extends out of the mounting hole and is connected to the diode.

[0047] The busbar includes a busbar body and a lead-out terminal; the busbar body is connected to the battery cell; the lead-out terminal is connected to the busbar near the jumper wire and is perpendicular to the busbar body; the busbar body is located between the backplate and the battery cell; the lead-out terminal extends out of the mounting hole and is connected to the diode.

[0048] The jumpers are located on the back of the battery, with two jumpers placed at the first and sixth columns of the battery string (near the frame of the photovoltaic unit), respectively. This reduces the length of the lead wires. At the system end, the photovoltaic array is composed of several photovoltaic modules connected in series. The lead wires refer to the wiring required between adjacent photovoltaic modules. That is, the closer to the edge, the shorter the required lead wire length, reducing power loss and lowering material costs.

[0049] The present invention proposes a high-reliability photovoltaic module, which divides the photovoltaic module into four equal parts by setting four bypass diodes, so that when a hot spot occurs in one part, the photovoltaic module only loses 1 / 4 of the power generation, thereby improving the power generation capacity of the photovoltaic module when a hot spot occurs.

[0050] In the photovoltaic module, the jumper and the busbar are arranged on the back surface of the cell unit, the insulating layer has lower requirements for weather resistance and cross-linking with the positive and back surface adhesive film, a thinner material can be selected, the material selection space is larger, the power generation capacity of the photovoltaic module is improved on the basis of reducing the cost.

[0051] The back plate of the photovoltaic module only needs to be provided with two mounting holes, and the load bearing capacity of the module is improved.

[0052] The embodiment of the application further provides a photovoltaic system comprising the high-reliability photovoltaic module.

[0053] Although the specific embodiments of the application are described above with reference to the drawings, the description is not a limitation on the scope of protection of the application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the application without creative labor are still within the scope of protection of the application.

Claims

1. A high-reliability photovoltaic module, characterized in that, include: Positive terminal block, negative terminal block, and two sets of photovoltaic units; Each photovoltaic unit includes a battery cell, a busbar, and two diodes; one diode is connected between the busbar and the negative terminal of the battery cell; the other diode is connected between the busbar and the positive terminal of the battery cell; the busbar is connected to the battery cell. Two sets of battery cells are connected in series; The positive terminal is connected to one of the busbars; the negative terminal is connected to the other busbar.

2. A high-reliability photovoltaic module as described in claim 1, characterized in that, The two diodes in the photovoltaic unit are placed in the same junction box.

3. A high-reliability photovoltaic module as described in claim 1, characterized in that, The battery unit is mounted on the back panel; the back panel has two mounting holes. The diodes are all connected to the battery cells via jumpers; Two battery cells are located on one side of the backplate, and four diodes are located on the other side of the backplate. One of the photovoltaic units' jumpers and busbars passes through one of the mounting holes and connects to the two diodes of that photovoltaic unit; The jumper and busbar of another photovoltaic unit are connected to the two diodes of that photovoltaic unit after passing through another mounting hole.

4. A high-reliability photovoltaic module as described in claim 3, characterized in that, A jumper cable includes the jumper cable body and the jumper cable extension end; The jumper extension is connected to the second end of the jumper body, and the jumper extension is perpendicular to the second end of the jumper body. The jumper body is located between the backplate and the battery cell. The first end of the jumper body is connected to the battery cell. The jumper extension extends out of the mounting hole and is connected to the diode.

5. A high-reliability photovoltaic module as described in claim 4, characterized in that, The busbar includes a busbar body and a lead-out terminal; the busbar body is connected to the battery cell; the lead-out terminal is connected to the busbar near the jumper wire and is perpendicular to the busbar body; the busbar body is located between the backplate and the battery cell; the lead-out terminal extends out of the mounting hole and is connected to the diode.

6. A high-reliability photovoltaic module as described in claim 1, characterized in that, The distances between the two busbars and the negative terminals of the connected battery cells are different.

7. A high-reliability photovoltaic module as described in claim 1, characterized in that, An insulating layer is placed between the jumper wire and the battery cell.

8. A high-reliability photovoltaic module as described in claim 1, characterized in that, The two diodes in the photovoltaic unit are installed in opposite directions.

9. A high-reliability photovoltaic module as described in claim 1, characterized in that, A battery cell comprises multiple parallel battery strings, and each battery string comprises multiple battery cells connected in series.

10. A photovoltaic system, characterized in that, Includes a high-reliability photovoltaic module as described in any one of claims 1-9.

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