Interconnector, photovoltaic module and preparation method of photovoltaic module
By providing conductive parts opposite to each other in the first and second areas of the interconnecting strip body, and setting the gate line contact surface of the conductive parts as a planar structure, the large amount of conductive glue consumption and high-temperature welding of tin in the prior art are solved. The problem of efficient electrical connection and reduces costs.
Patent Information
- Application Number
- CN202411516361.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-02-07
AI Technical Summary
In the existing preparation methods of solar cell modules, conductive adhesive consumption is large, costly, and requires high temperature welding of tin powder, which affects the performance of the battery.
The conductive parts opposite to each other are arranged in the first and second areas of the interconnection strip body, and the electrical connection between the interconnection strip and the battery cell is achieved by using the conductive parts, and the gate line contact surface of the conductive parts is set as a planar structure. Improved to wire connection, increase contact area, and reduce contact resistance.
The electrical connection is achieved through conductive parts, which reduces the contact resistance between the interconnection strip and the cell, improves the conductive characteristics of the photovoltaic module, simplifies the preparation process, and reduces costs.
Smart Images
Figure CN119403241A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of solar cell manufacturing, and in particular to an interconnection strip, a photovoltaic module and a method for preparing the photovoltaic module. Background Art
[0002] In the existing preparation method of preparing a battery string using interconnection bars, conductive glue is usually used as a bonding component, and the interconnection bars and the battery cells are bonded together by applying glue on the glue points of the battery cell fine grid. However, this method consumes a lot of conductive glue, otherwise it cannot play the role of fixing the interconnection bars, and the cost requirement is relatively high. At the same time, the existing preparation process requires the interconnection bars to be soldered and tinned to form an electrical connection between the interconnection bars and the fine grid, so a higher preparation temperature is required, which has a significant impact on the performance of the battery cell. Summary of the invention
[0003] In view of this, the embodiments of the present invention provide an interconnection bar, a photovoltaic module, and a method for preparing a photovoltaic module. By arranging conductive members opposite to each other in the first region and the second region of the main body of the interconnection bar, the conductive members can be used to realize electrical connection between the main body of the interconnection bar and the cell. At the same time, the grid line contact surface of the conductive member is set to a plane structure, and the point connection between the interconnection bar and the fine grid in the prior art is improved to a line connection, which effectively increases the contact area between the main body of the interconnection bar and the fine grid of the cell, and reduces the contact resistance.
[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:
[0005] In a first aspect, the present invention provides an interconnection strip for use in a photovoltaic module, comprising: an interconnection strip body, and conductive members spaced apart in a first region and a second region of the interconnection strip body; wherein the conductive member located in the first region is disposed opposite to the conductive member located in the second region; and the grid line contact surface of the conductive member is a planar structure.
[0006] Optionally, the distance between each two adjacent conductive members is consistent with the distance between fine grids on a cell sheet in a photovoltaic module to which the conductive members are applied.
[0007] Optionally, the interconnection bar body is a cylinder; the conductive member includes: an arc surface arranged opposite to the gate line contact surface and adjacent to the interconnection bar body; wherein the curvature of the arc surface matches the outer contour of the interconnection bar body; the area of the gate line contact surface is larger than the projection area of the arc surface.
[0008] Optionally, the conductive member has a thickness of 10 μm-20 μm.
[0009] Optionally, the contact length between the conductive member and the interconnection bar body in the circumferential direction is less than or equal to 1 / 4 of the circumference of the cross section of the interconnection bar body.
[0010] Optionally, the conductive element is made of any one or more of the following materials: silver-based conductive paste, gold-based conductive paste, copper-based conductive paste, and carbon-based conductive paste.
[0011] In a first aspect, the present invention provides a photovoltaic module, comprising: a stacked front plate, a front adhesive film, a battery array, a back adhesive film and a back plate; wherein the battery array comprises: a battery string formed by connecting battery cells in series based on the above-mentioned interconnection strip, wherein the first area and the second area on the interconnection strip are respectively connected to two adjacent battery cells in the battery string. .
[0012] In a second aspect, the present invention provides a method for preparing a photovoltaic module, comprising: step 1, laying interconnection strips and battery cells in sequence on a conveyor belt to prepare a battery string; wherein, conductive members arranged at intervals are provided on the interconnection strips, and the conductive members in the first area and the second area on each of the interconnection strips are arranged back to back and are respectively connected to two adjacent battery cells in the battery string; step 2, stacking a plurality of battery strings according to a preset arrangement rule to obtain a battery array; step 3, laminating the stacked front panel, front adhesive film, the battery array, back adhesive film, and back panel.
[0013] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects: by arranging conductive members opposite to each other in the first area and the second area of the interconnection bar body, the conductive members can be used to realize the electrical connection between the interconnection bar body and the battery cell. At the same time, the grid line contact surface of the conductive member is set to a plane structure, and the point connection between the interconnection bar and the fine grid in the prior art is improved to a line connection, which effectively increases the contact area between the interconnection bar body and the fine grid of the battery cell and reduces the contact resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.
[0015] Figure 1 is a schematic diagram of the overall structure of an interconnection strip according to an embodiment of the present invention;
[0016] Figure 2 is a schematic diagram of a partial structure of one end of an interconnection strip according to an embodiment of the present invention;
[0017] Figure 3 It is a schematic diagram of the structure between the conductive glue and the fine grid in the prior art;
[0018] Figure 4 is a schematic diagram of the structure between the conductive member and the fine grid according to an embodiment of the present invention;
[0019] Figure 5 is a schematic cross-sectional structure diagram of an interconnection strip according to an embodiment of the present invention;
[0020] Figure 6 is a schematic diagram of the overall structure of a photovoltaic module according to an embodiment of the present invention;
[0021] Figure 7 is a schematic cross-sectional structure diagram of a battery string according to an embodiment of the present invention;
[0022] Figure 8 is a structural schematic diagram of the positional relationship between the interconnection bar body and the battery cell according to an embodiment of the present invention;
[0023] Fig. 9 is a schematic diagram of the location of the adhesive layer in a photovoltaic module according to an embodiment of the present invention;
[0024] Fig.10 is a schematic cross-sectional structure diagram of a photovoltaic module provided with an adhesive layer according to an embodiment of the present invention;
[0025] Fig.11 is a schematic diagram of the main process of a method for preparing a photovoltaic module according to an embodiment of the present invention;
[0026] Fig.12 is a schematic diagram of a specific flow chart of step S1101 according to an embodiment of the present invention;
[0027] Fig.13 is a schematic structural diagram of a photovoltaic device for preparing a battery string according to an embodiment of the present invention.
[0028] The reference numerals are as follows:
[0029] 1-interconnection strip body; 11-first region; 12-second region; 2-conductive member; 21-grid line contact surface; 22-arc surface; 3-cell; 4-adhesive layer; 5-front plate; 6-front adhesive film; 7-cell array; 8-back adhesive film; 9-back plate;
[0030] 100-insulating glue; 200-fine grid; 300-conveyor belt; 400-heating device; 500-adhesive layer cutting device. DETAILED DESCRIPTION
[0031] A solar cell is a photoelectric semiconductor sheet that uses sunlight to generate electricity directly. It is also called a "solar chip" or "photovoltaic cell". As long as it is illuminated by light that meets certain illumination conditions, it can instantly output voltage and generate current in the presence of a circuit. In physics, it is called solar photovoltaic (PV), or photovoltaic for short. In order to conveniently and clearly describe the method for preparing a solar cell and the solar cell of the present invention, the following exemplary embodiments of the present invention are described in conjunction with the accompanying drawings, which include various details of the embodiments of the present invention to facilitate understanding, and they should be considered as merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.
[0032] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, this embodiment provides an interconnection strip, which is applied to a photovoltaic module, comprising: an interconnection strip body 1, and conductive members 2 spaced apart on a first region 11 and a second region 12 of the interconnection strip body 1; wherein the conductive member 2 located in the first region 11 is disposed opposite to the conductive member 2 located in the second region 12; and a grid line contact surface 21 of the conductive member 2 is a planar structure.
[0033] in, Figure 1 Schematic diagram of the overall structure of the interconnection strip. Since the two ends of each interconnection strip are usually used to connect different sides of two adjacent battery cells, in order to minimize the contact resistance between the interconnection strip body 1 and the battery cell 3, the embodiment of the present invention preferably arranges the conductive members 2 evenly in the first area 11 and the second area, and the conductive members 2 in the first area 11 and the second area 12 need to be arranged back to back to connect to the front and back sides of the two adjacent battery cells respectively. Figure 1 It can be seen that, no matter in the first area 11 or the second area 12 , the conductive elements 2 are arranged at intervals, and the intervals between two adjacent conductive elements 2 can be the same or different.
[0034] In an optional embodiment, in order to achieve effective electrical connection with each fine grid on the cell, the spacing between each two adjacent conductive members 2 is consistent with the spacing between the fine grids on the cell 3 in the photovoltaic module to which they are applied. In other words, the number of conductive members 2 is the same as the number of fine grids on the cell 3, and each conductive member 2 is connected to a corresponding fine grid on the cell 3.
[0035] Figure 2 is a schematic diagram of the local structure at one end of the interconnection strip. Figure 2It can be seen that in an optional embodiment, the interconnection bar body 1 is a cylinder; the conductive member 2 includes: an arc surface 22 disposed opposite to the grid line contact surface 21 and adjacent to the interconnection bar body 1; wherein the curvature of the arc surface 22 matches the outer contour of the interconnection bar body 1; the area of the grid line contact surface 21 is larger than the projection area of the arc surface 22. It should be noted that there are two types of interconnection bar structures currently on the market, one is a simple cylinder as an interconnection bar, and the other is an interconnection bar with a flat strip structure. Compared with the cylinder, the width of the interconnection bar with a flat strip structure is much larger than the diameter of the cylinder, resulting in a serious shading problem of the interconnection bar with a flat strip structure, which affects the overall power generation of the photovoltaic module. Therefore, the embodiment of the present invention is mainly based on the improvement of the cylindrical interconnection bar in the prior art, and the conductive member 2 is only set at the connection position corresponding to the fine grid, which not only does not cause the problem of light blocking, but also can use the grid line contact surface 21 of the conductive member 2 to increase the contact area between the fine grid and reduce the contact resistance.
[0036] It should be noted that the structure of the conductive adhesive in the prior art is generally as follows: Figure 3 As shown, 100 is the insulating glue dotted between the fine grid 200 and the interconnection strip 1. Figure 3 It can be seen that in the prior art, the contact between the insulating glue 100 and the fine grid 200 is in a 90° sudden increase state. During the curing process of the insulating glue, the glass transition temperature of the insulating glue is positively correlated with the hardness. In other words, the higher the glass transition temperature, the higher the tension generated during the curing process of the insulating glue. Under the action of the sudden increase in tension, it is very easy to cause the battery cell 3 to break. Therefore, the embodiment of the present invention connects the arc surface 22 and the grid line contact surface 21 through an inclined surface, so that the contact between the conductive member 2 and the fine grid is in a slowly increasing state, such as Figure 4 As shown. Figure 4 It can be seen that the conductive member 2 provided in the embodiment of the present invention can provide a gradient-increasing tension between the conductive member 2 and the fine gate 200 , effectively avoiding the risk of cracking and gate breaking caused by the sudden increase in tension in the prior art.
[0037] Figure 5 is a schematic diagram of the cross-sectional structure of an interconnection strip provided by an embodiment of the present invention. Since the conductive members 2 of the first area 11 and the second area 12 of the interconnection strip body 1 are arranged opposite to each other, Figure 3 In the figure, the structure of the conductive member 2 can be seen both above and below the interconnection strip body 1, but the conductive members 2 are actually located in different areas corresponding to the two sides.
[0038] In an optional embodiment, the conductive member 2 is made of any one or more of the following materials: silver conductive glue, gold conductive glue, copper conductive glue and carbon conductive glue. It can be understood that the above materials are all flexible materials and can be deformed to a certain extent under the action of external force. Therefore, in another optional embodiment, the conductive member 2 can also be set to other shapes such as arcs and included on the outside of the interconnection bar body 1, so that under the action of external force, it is deformed through the squeezing effect between the battery cell 3, so that the grid line contact surface 21 of the conductive member 2 after deformation is a planar structure.
[0039] In a further optional embodiment, the thickness of the conductive member 2 is 10 μm to 20 μm, such as 10 μm, 12 μm, 15 μm, 17 μm, 20 μm, etc. It should be noted that the thickness of the conductive member 2 should not be too large or too small. If the thickness of the conductive member 2 is too small, the effective connection area with the fine grid cannot be guaranteed; and if the thickness of the conductive member 2 is too large, the cost of consumables will increase. Therefore, it is necessary to ensure that the thickness of the conductive member 2 is within a reasonable range to reduce the cost of consumables as much as possible while improving the conductive effect.
[0040] In an optional embodiment, in order to reduce the cost of consumables as much as possible, the following can be done: Figure 2 and Figure 5 As shown, the contact length between the conductive member 2 and the interconnection bar body 1 in the circumferential direction is set to be less than or equal to 1 / 4 of the cross-sectional circumference of the interconnection bar body 1. Through the above setting, the conductive member 2 is only wrapped around the outside of a small part of the interconnection bar body 1 to meet the contact requirements with the fine grid.
[0041] In summary, the interconnection bar provided in the embodiment of the present invention can realize the electrical connection between the interconnection bar body and the battery cell by arranging the conductive members opposite to each other in the first area and the second area of the interconnection bar body. At the same time, the grid line contact surface of the conductive member is set as a plane structure, and the point connection between the interconnection bar and the fine grid in the prior art is improved to a line connection, which effectively increases the contact area between the interconnection bar body and the battery cell fine grid and reduces the contact resistance.
[0042] The present invention also provides a photovoltaic module, such as Figure 6 As shown, the photovoltaic module provided by the present invention includes: a stacked front panel 5, a front adhesive film 6, a battery array 7, a back adhesive film 8 and a back panel 9; wherein the battery array 7 includes: a battery string formed by connecting the battery cells 3 in series with the above-mentioned interconnection strips, and the first area 11 and the second area 12 on the interconnection strips are respectively connected to two adjacent battery cells 3 in the battery string.
[0043] It can be understood that the front panel 5, front adhesive film 6, back adhesive film 8 and back panel 9 in the photovoltaic module provided in the embodiment of the present invention are the same as the conventional settings, only the interconnection strip structure in the battery array 7 and the battery string structure formed by connecting the battery cells 3 in series through the interconnection strips are different from the existing structure.
[0044] Specifically, the specific structure of the battery string in the photovoltaic module provided by the embodiment of the present invention can be as follows: Figure 7 and Figure 8 As shown. Among them, Figure 7 is a schematic diagram of the cross-sectional structure of a battery string. Figure 8 This is a top view of the battery string. It should be noted that: Figure 8 It is only used as a schematic diagram to show the positional relationship between the interconnection strip body 1 and the battery cell 3, and the number of the conductive members 2 does not represent the actual number. Figure 7 and Figure 8 It can be seen that the first area 11 and the second area 12 of the interconnection bar body 1 are connected to the battery cell 3 on the left and the battery cell 3 on the right respectively, and the conductive member 2 is always arranged on the side facing the fine grid 200 on the battery cell, and the positions of the conductive member 2 and the fine grid 200 correspond one to one. Through the above structure, multiple battery cells 2 are connected in series into a battery string by using the interconnection bar with the conductive member 2, which increases the contact area between the fine grids 200 on the battery cell of the interconnection bar, thereby greatly reducing the contact resistance.
[0045] In a further optional embodiment, the photovoltaic module provided by the embodiment of the present invention further includes: an adhesive layer 4; wherein the adhesive layer 4 covers the main surface of the interconnection bar and the battery cell 3, and bonds the interconnection bar and the battery cell 3 into an integral structure. For example, the cross-sectional structure of the location where the adhesive layer 4 is set is as follows: Fig. 9 As shown. Different from the prior art, the present invention uses the conductive member 2 and the adhesive layer 4 to achieve the functions of conduction and fixation. Compared with the prior art that uses soldering to tin for electrical connection and uses glue dispensing to fix, the photovoltaic module provided by the embodiment of the present invention uses the adhesive layer 4 to achieve fixation, and no longer requires the tinning process. Therefore, the temperature required in the preparation process is also significantly reduced, which is more suitable for industrial production.
[0046] It is understandable that the battery cell 3 located in the middle position of the battery string needs to be connected to the two adjacent battery cells 3 on the left and right respectively, so interconnection strips need to be set on the upper and lower surfaces of each battery cell 3 respectively, and therefore an adhesive structure 4 needs to be set on the outside of each interconnection strip to ensure that each interconnection strip can be fixed.
[0047] In an optional embodiment, the adhesive layer 4 provided in the embodiment of the present invention is a thin film structure having adsorption properties with the battery cell 3. After the adhesive layer 4 is covered on the interconnection strip, the thin film structure needs to be shrunk by heating, and the interconnection strip is wrapped and adsorbed on the battery cell 3 to form a Fig.10 The structure shown in the figure can achieve the fixing effect between the interconnection strip and the battery cell 3. In another optional embodiment, the adhesive layer 4 can also be a non-conductive glue, which is disposed at the position where the interconnection strip contacts the fine grid by dispensing.
[0048] In summary, the photovoltaic module provided in the embodiment of the present invention utilizes the conductive member 2 and the adhesive layer 4 to respectively realize electrical connection and fixation, which not only reduces the contact resistance between the interconnection strip and the battery cell 3 and improves the conductive properties of the photovoltaic module, but also eliminates the welding process. The interconnection strip and the battery cell 3 can be bonded into an integrated structure using only the adhesive assembly, thereby simplifying the preparation process.
[0049] Fig.11 The method for preparing a photovoltaic module provided by an embodiment of the present invention is shown, such as Fig.11 As shown, the method for preparing a photovoltaic module provided by the present invention comprises:
[0050] Step S1101, laying interconnection bars and battery cells 3 on a conveyor belt in sequence to prepare a battery string; wherein the interconnection bars are provided with conductive members 2 arranged at intervals, and the conductive members 2 in the first area 11 and the second area 12 of each interconnection bar are arranged opposite to each other and are respectively connected to two adjacent battery cells 3 in the battery string;
[0051] Step S1102, stacking multiple battery strings according to a preset arrangement rule to obtain a battery array;
[0052] Step S1103 , laminating the stacked front panel, front adhesive film, battery array, back adhesive film, and back panel.
[0053] The order of laying the interconnection strips and the battery cells 3 in step S1101 can be as follows: Figure 7 In a further optional embodiment, in the case where the adhesive layer 4 is provided to fix the interconnection strips and the battery cells 3, the specific process of step S1101 can be as follows: Fig.12 As shown, including:
[0054] Step S1201, laying an adhesive layer 4, an interconnection bar and battery cells 3 in sequence on a conveyor belt, so that the adhesive layer 4 wraps the first region 11 and the second region 12 of the interconnection bar on two adjacent battery cells 3 respectively;
[0055] Step S1202, using infrared heating to melt the adhesive layer 4, so that the adhesive layer 4 and the battery cell 3 are adsorbed together;
[0056] Step S1203, cooling and fixing the adhesive layer 4 to obtain a battery string.
[0057] The order of laying the adhesive layer 4, the interconnection strips and the battery cells 3 in step S1201 can be as follows: Fig. 9 As shown, it can also be laid from bottom to top.
[0058] It should be noted that, for the conductive member 2 provided on the interconnection strip, since the present invention is prepared by any one or more of silver-based conductive glue, gold-based conductive glue, copper-based conductive glue and carbon-based conductive glue, in step S1101, in an optional embodiment, the conductive member 2 provided on the interconnection strip is in a pre-cured state, that is, a gel-like structure that is partially cured but not completely cured. In this state, the conductive member 2 can be more easily deformed during the process of connecting with the battery cell 3 and assembling to prepare a battery string, thereby better connecting with the battery cell 3, and there will be no glue dripping problem of the conductive member 2 located under the interconnection strip due to the complete lack of curing. It can be understood that with the process of heating the adhesive layer 4 by infrared in step S1202, a relatively high temperature will be generated, and the conductive member 2 can be further cured, that is, the conductive member 2 is converted from a pre-cured state to a fully cured state.
[0059] In an optional embodiment, the photovoltaic device for preparing the battery string can be as follows: Fig.13 As shown. The upper and lower sides of the conveyor belt 300 are respectively provided with heating devices 400. Fig. 9 After the adhesive layer 4, interconnection strips and battery cells 3 are laid in sequence, infrared light irradiation is provided through the heating devices on the upper and lower sides, and the heat of the infrared light is used to melt the adhesive layer 4. After the infrared irradiation, the conveyor belt is moved to the right so that the next battery cell is located under the heating device 400.
[0060] In addition, Fig.13 In the embodiment, the photovoltaic device is also provided with an adhesive layer cutting device 500 located at the front end of the conveyor belt 300, which is used to cut the adhesive layer 4 of a suitable size according to the specifications of the battery cell 3, and move the cut adhesive layer 4 to the conveyor belt through a robotic arm.
[0061] For the cooling and fixing process in step S1203, in an optional embodiment, natural cooling can be performed as the conveyor belt moves. In another optional embodiment, one or more air holes can be provided on the conveyor belt to achieve rapid cooling of the adhesive layer 4 by blowing air.
[0062] In summary, the method for preparing a photovoltaic module provided in an embodiment of the present invention utilizes a conductive member 2 and an adhesive layer 4 to respectively realize electrical connection and fixation, which not only reduces the contact resistance between the interconnection strip and the battery cell 3 and improves the conductive properties of the photovoltaic module, but also eliminates the welding process. The interconnection strip and the battery cell 3 can be bonded into an integrated structure using only an adhesive assembly, thereby simplifying the preparation process.
[0063] Example 1
[0064] An interconnection strip, applied to a photovoltaic module, comprising:
[0065] An interconnection bar body, and conductive members spaced apart and arranged on the first region and the second region of the interconnection bar body;
[0066] The conductive element 2 located in the first area 11 and the conductive element 2 located in the second area 12 are arranged opposite to each other, and the gate line contact surface of the conductive element is a planar structure.
[0067] Example 2
[0068] A photovoltaic module, comprising: a front plate, a front adhesive film, a battery array, a back adhesive film and a back plate which are stacked;
[0069] Wherein, the battery array includes: a plurality of battery strings stacked according to a preset arrangement rule;
[0070] The battery string is formed by connecting the interconnection strips in Example 1 in series with the battery cells using an adhesive layer, and the first area and the second area on the interconnection strip are respectively connected to two adjacent battery cells in the battery string;
[0071] Wherein, the bonding layer is non-conductive glue.
[0072] Example 3
[0073] A photovoltaic module, comprising: a front plate, a front adhesive film, a battery array, a back adhesive film and a back plate which are stacked;
[0074] Wherein, the battery array includes: a plurality of battery strings stacked according to a preset arrangement rule;
[0075] The battery string is formed by connecting the interconnection strips in Example 1 in series with the battery cells using an adhesive layer, and the first area and the second area on the interconnection strip are respectively connected to two adjacent battery cells in the battery string;
[0076] Wherein, the adhesive layer is EVA film material.
[0077] Comparative Example
[0078] A photovoltaic module, comprising: a front plate, a front adhesive film, a battery array, a back adhesive film and a back plate which are stacked;
[0079] Wherein, the battery array includes: a plurality of battery strings stacked according to a preset arrangement rule;
[0080] The battery string is formed by connecting the battery cells in series with cylindrical interconnecting bars using conductive glue, and the first area and the second area on the interconnecting bar are respectively connected to two adjacent battery cells in the battery string.
[0081] The consumption of the conductive adhesive (conductive member) in the above-mentioned Examples 2 and 3 is compared with the consumption of the conductive adhesive in the comparative example as shown in the following table:
[0082]
[0083] In actual application, the cost of conductive adhesive is usually much higher than that of non-conductive adhesive and film material, with conductive adhesive costing 15 yuan / g, insulating adhesive costing 0.4 yuan / g, and film material costing 3 yuan / m 2 Calculation shows that compared with the total cost of the comparative example, each interconnection strip of Examples 2 and 3 can save more than 0.15 yuan in cost, which not only effectively improves the conductive effect, but also greatly reduces the cost of raw materials.
[0084] The introduction provided in the above steps is only used to help understand the structure, method and core idea of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also belong to the scope of protection of the claims of the present invention.
Claims
1. An interconnection strip, characterized in that: Applied to photovoltaic modules, including: An interconnection strip body (1), and conductive members (2) arranged at intervals in a first region (11) and a second region (12) of the interconnection strip body (1); Wherein, the conductive element (2) located in the first area (11) and the conductive element (2) located in the second area (12) are arranged opposite to each other; Furthermore, the gate line contact surface (21) of the conductive element (2) is a planar structure.
2. The interconnection strip according to claim 1, characterized in that The distance between each two adjacent conductive members (2) is consistent with the distance between the fine grids on the cell sheet (3) in the photovoltaic module to which they are applied.
3. The interconnection strip according to claim 1, characterized in that The interconnection strip body (1) is a cylinder; The conductive member (2) comprises: a curved surface (22) disposed opposite to the grid line contact surface (21) and adjacent to the interconnection strip body (1); The curvature of the curved surface (22) matches the outer contour of the interconnection strip body (1); The area of the gate line contact surface (21) is larger than the projection area of the arc surface (22).
4. The interconnection strip according to claim 1, characterized in that The thickness of the conductive element (2) is 10 μm to 20 μm.
5. The interconnection strip according to claim 3 or 4, characterized in that: The contact length between the conductive element (2) and the interconnection strip body (1) in the circumferential direction is less than or equal to 1 / 4 of the circumference of the cross section of the interconnection strip body (1).
6. The interconnection strip according to claim 1, characterized in that The conductive element (2) is made of any one or more of the following materials: silver-based conductive glue, gold-based conductive glue, copper-based conductive glue and carbon-based conductive glue.
7. A photovoltaic module, characterized in that: include: A front plate, a front adhesive film, a battery array, a back adhesive film and a back plate are stacked; wherein, The battery array comprises: a battery string formed by connecting battery cells (3) in series based on the interconnection strip according to any one of claims 1 to 6, wherein a first area (11) and a second area (12) on the interconnection strip are respectively connected to two adjacent battery cells (3) in the battery string.
8. The photovoltaic module according to claim 7, characterized in that: Also includes: Adhesive layer (4); The adhesive layer (4) covers the main surfaces of the interconnection strip and the battery cell (3), and adheres the interconnection strip and the battery cell (3) into an integrated structure.
9. A method for preparing a photovoltaic module, characterized in that: include: Step 1, laying interconnection strips and battery cells (3) in sequence on a conveyor belt to prepare a battery string; wherein the interconnection strips are provided with conductive elements (2) arranged at intervals, and the conductive elements (2) in the first region (11) and the second region (12) on each interconnection strip are arranged opposite to each other and are respectively connected to two adjacent battery cells (3) in the battery string; Step 2, stacking multiple battery strings according to a preset arrangement rule to obtain a battery array; Step 3, laminating the stacked front panel, front adhesive film, the battery array, back adhesive film, and back panel.
10. The preparation method according to claim 9, characterized in that: The step 1 comprises: Step 11, laying an adhesive layer (4), an interconnection strip, and a battery cell (3) in sequence on a conveyor belt, so that the adhesive layer (4) wraps the first region (11) and the second region (12) of the interconnection strip around two adjacent battery cells (3) respectively; Step 12, heating and melting the adhesive layer (4) by infrared means, so that the adhesive layer (4) and the battery cell (3) are adsorbed together; Step 13, cooling and fixing the adhesive layer (4) to obtain the battery string.