A conductive structure applied to a photovoltaic module, a cell string and a photovoltaic module
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2026-08-11
AI Technical Summary
[0003]但是，现有的绝缘胶采用丝网印刷，在印刷过程中容易出现错位、虚印、漏印等问题，无法有效地实现极性相反的焊带与细栅之间的绝缘
[0017]The first aspect of the above-mentioned utility model has the following advantages or beneficial effects: By setting a light-transmitting insulating area in the insulating tape, and setting the first conductive area of the conductive component corresponding to the light-transmitting insulating area on the outside of the tape substrate in the insulating tape, during the laser welding process, the light-transmitting insulating area can transmit laser light so that the first conductive area of the conductive component can form effective electrical contact with the battery cell. Furthermore, by setting a reflective insulating area, the laser spot outside the light-transmitting insulating area can be reflected, effectively avoiding the problem of discoloration of the insulating adhesive.
Smart Images
Figure CN224627088U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic module manufacturing technology, and in particular to a conductive structure, battery string, and photovoltaic module for use in photovoltaic modules. Background Technology
[0002] For existing photovoltaic modules, the common conductive structure is the solder ribbon itself. By soldering the solder ribbon to the solar cell, current can be conducted out of the cell. For photovoltaic modules where both the positive and negative electrodes are located on the same side of the solar cell, insulating adhesive is usually printed at the ends of the grid at both the positive and negative electrodes to prevent short circuits between the solder ribbon and the grid with opposite polarity during the soldering process between the solder ribbon and the PAD point.
[0003] However, existing insulating adhesives are printed using screen printing, which is prone to problems such as misalignment, incomplete printing, and missing prints during the printing process, making it impossible to effectively achieve insulation between the solder strips with opposite polarities and the fine grid. Furthermore, during the soldering process, the laser spot may shine on the insulating adhesive at the end of the fine grid, causing discoloration and thus affecting the overall performance of the photovoltaic module. Utility Model Content
[0004] In view of this, the present invention provides a conductive structure, a battery string, and a photovoltaic module. By setting a light-transmitting insulating region within an insulating tape, and placing a first conductive region of a conductive element corresponding to this light-transmitting insulating region on the outside of the tape substrate, the light-transmitting insulating region allows the laser to pass through during laser welding, enabling effective electrical contact between the first conductive region of the conductive element and the battery cell. Furthermore, by setting a reflective insulating region, the laser spot outside the light-transmitting insulating region can be reflected, effectively preventing discoloration of the insulating tape.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0006] In a first aspect, this utility model provides a conductive structure for use in photovoltaic modules, comprising: an insulating tape with a strip structure, the insulating tape including an insulating layer and a tape substrate laminated on one side of the insulating layer; wherein the insulating layer includes light-transmitting insulating regions and reflective insulating regions alternately arranged along the length direction of the insulating tape; and a conductive member disposed corresponding to the insulating layer, the extension direction of the conductive member being consistent with the extension direction of the insulating tape, and a first conductive region of the conductive member corresponding to the light-transmitting insulating region being located on the side of the tape substrate away from the insulating layer, so that the first conductive region is electrically connected to the grid lines of the solar cell.
[0007] Optionally, the light transmittance of the light-transmitting insulating region is not less than 90%; and / or, the reflectivity of the reflective insulating region is not less than 90%.
[0008] Optionally, the insulating tape has a plurality of through holes spaced apart along its length direction, penetrating its thickness direction; the conductive element passes through the plurality of through holes on the insulating tape in sequence, such that the first conductive area of the conductive element corresponding to the light-transmitting insulating area is located on the side of the tape substrate away from the insulating layer, and the second conductive area of the conductive element corresponding to the reflective insulating area is located on the side of the insulating layer away from the tape substrate.
[0009] Optionally, the through hole is located in the adjacent area of the light-transmitting insulating area and the reflective insulating area; or, the through hole is located in the light-transmitting insulating area and close to the reflective insulating area.
[0010] Optionally, the cross-sectional shape of the through hole matches the conductive element.
[0011] Optionally, the thickness of the insulating layer is not greater than 0.05 mm.
[0012] Optionally, the conductive element, corresponding to a first conductive region of the light-transmitting insulating region, contacts a PAD point on the battery cell; in the width direction of the insulating tape, the size of the through hole is less than or equal to the size of the PAD point on the battery cell.
[0013] Optionally, the conductive element, corresponding to a first conductive area of the light-transmitting insulating area, contacts a PAD point on the battery cell; along the length of the insulating tape, the size of the light-transmitting insulating area is less than or equal to the size of the PAD point on the battery cell; the size of the light-transmitting insulating area is greater than the size of the laser spot used to weld the conductive element to the PAD point on the battery cell.
[0014] Secondly, this utility model provides a battery string, comprising: a plurality of battery cells and any of the above-mentioned conductive structures; wherein, the conductive structure is disposed corresponding to the main grid position of the battery cell; wherein, the light-transmitting insulating area of the insulating tape corresponds to the PAD point in the battery cell, and the first conductive area of the conductive member corresponding to the light-transmitting insulating area abuts against the PAD point.
[0015] Thirdly, this utility model provides a photovoltaic module, including: a backsheet, a battery array, an encapsulating film, and a cover plate, wherein the encapsulating film is used to encapsulate the battery array between the backsheet and the cover plate.
[0016] The battery array includes multiple battery strings arranged according to a preset layout, and the battery strings are any of the aforementioned types of battery strings.
[0017] The first aspect of the above-mentioned utility model has the following advantages or beneficial effects: By setting a light-transmitting insulating area in the insulating tape, and setting the first conductive area of the conductive component corresponding to the light-transmitting insulating area on the outside of the tape substrate in the insulating tape, during the laser welding process, the light-transmitting insulating area can transmit laser light so that the first conductive area of the conductive component can form effective electrical contact with the battery cell. Furthermore, by setting a reflective insulating area, the laser spot outside the light-transmitting insulating area can be reflected, effectively avoiding the problem of discoloration of the insulating adhesive. Attached Figure Description
[0018] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:
[0019] Figure 1 This is a schematic diagram of a conductive structure applied in a photovoltaic module according to an embodiment of the present invention;
[0020] Figure 2 This is a schematic diagram of another conductive structure applied in a photovoltaic module according to an embodiment of the present invention;
[0021] Figure 3 This is a structural schematic diagram of the insulating tape according to an embodiment of the present utility model;
[0022] Figure 4 This is a schematic diagram of the overall structure of the battery cell according to an embodiment of the present utility model;
[0023] Figure 5 This is a schematic diagram of the specific structure of the battery cell according to an embodiment of the present utility model;
[0024] Figure 6 This is a schematic diagram showing the positional relationship between the conductive structure and the battery cell according to an embodiment of the present invention;
[0025] Figure 7 This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present utility model.
[0026] The attached figures are labeled as follows:
[0027] 1-Conductive component;
[0028] 2-Insulating tape; 21-Insulating layer; 211-Transparent insulating area; 212-Reflective insulating area; 22-Tape substrate; 23-Through hole; 3-PAD point;
[0029] 100 - Solar cell; 200 - Conductive structure; 300 - Backsheet; 400 - Solar cell array; 500 - Cover plate; 600 - Adhesive film layer;
[0030] 10 - First fine grid; 20 - Second fine grid; 30 - Insulating adhesive; 40 - Main grid. Detailed Implementation
[0031] To facilitate and clearly describe the conductive structure, cell string, and photovoltaic module applied to photovoltaic modules according to this invention, exemplary embodiments of this invention are described below with reference to the accompanying drawings. These include various details of the embodiments to aid understanding and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.
[0032] Figure 1 and Figure 2 This illustration shows a schematic diagram of a conductive structure applied in a photovoltaic module according to an embodiment of the present invention. The conductive structure provided by the present invention includes: an insulating tape 2 with a strip structure, the insulating tape 2 including an insulating layer 21 and a tape substrate 22 stacked on one side of the insulating layer 21; wherein the insulating layer 21 includes light-transmitting insulating regions 211 and reflective insulating regions 212 alternately arranged along the length direction of the insulating tape 2; a conductive member 1 is provided corresponding to the insulating layer 21, the extension direction of the conductive member 1 is consistent with the extension direction of the insulating tape 2, and the first conductive region of the conductive member 1 corresponding to the light-transmitting insulating region 211 is located on the side of the tape substrate 22 away from the insulating layer 21, so that the first conductive region is electrically connected to the grid lines of the solar cells in the photovoltaic module.
[0033] from Figure 1 and Figure 2 As can be seen, this utility model, based on the existing conductive component 1, not only adds an insulating tape 2, but also utilizes the light-transmitting insulating region 211 and the reflective insulating region 212 in the insulating tape 2. This allows the first conductive region of the conductive component 1 corresponding to the light-transmitting insulating region 211 to be located below the insulating tape 2 and in contact with the battery cell. The high light transmittance of the light-transmitting insulating region 211 enables effective welding between the conductive component 1 and the battery cell. Simultaneously, the high reflectivity of the reflective insulating region 212 effectively protects the non-welded area between the conductive component 1 and the battery cell. Compared to the existing design scheme that directly uses the conductive component 1 (such as a solder strip) as an independent conductive structure, this design ensures welding performance while avoiding potential damage to the battery cell.
[0034] Understandably, although Figure 1 and Figure 2 The positional relationship between different regions of the conductive component 1 and the insulating tape 2 is different, but the first conductive region of the conductive component 1 corresponding to the light-transmitting insulating region 211 is always located on the side of the insulating tape 2 away from the insulating layer 21 (i.e., Figure 1 and Figure 2(As shown below the insulating tape 2), therefore, during laser welding, the high transmittance of the transparent insulating region 211 can be used to weld the conductive component 1 to the solar cell in the photovoltaic module. The conductive component 1 corresponds to the second conductive region of the reflective insulating region 212. Regardless of whether it is located above or below the insulating tape 2, the laser cannot effectively penetrate the reflective insulating region 212 due to its high reflectivity. Therefore, the second conductive region of the conductive component 1 corresponding to the reflective insulating region 212 will not generate heat, thus effectively preventing discoloration of the insulating layer 21 corresponding to the reflective insulating region 212.
[0035] In one optional embodiment, the light transmittance of the light-transmitting insulating region 211 is not less than 90%, such as 90%, 92%, 95%, 98%, 100%, etc.; the reflectivity of the reflective insulating region 212 is not less than 90%, such as 90%, 92%, 95%, 98%, 100%, etc.
[0036] In further optional embodiments, such as Figure 1 and Figure 3 As shown, the insulating tape 2 has multiple through holes 23 spaced along its length and extending through its thickness. The conductive element 1 passes through these through holes 23 sequentially, such that the first conductive region of the conductive element 1 corresponding to the light-transmitting insulating region 211 is located on the side of the tape substrate 22 away from the insulating layer 21, and the second conductive region of the conductive element 1 corresponding to the reflective insulating region 212 is located on the side of the insulating layer 21 away from the tape substrate 22. Figure 3 This is a schematic diagram of the structure of insulating tape 2 without conductive component 1, for comparison. Figure 1 and Figure 3 It can be clearly seen that by setting through holes 23 on the insulating tape 2, the conductive component 1 can be arranged in a wavy shape, increasing the overall length of the conductive component 1. Furthermore, a bent and extended area is set between every two adjacent welding areas (i.e., the first conductive area of the conductive component 1 corresponding to the light-transmitting insulating area 211) (i.e., the second conductive area of the conductive component 1 corresponding to the reflective insulating area 212). Since the insulating tape 2 itself has a certain deformation capacity, after the first conductive area of the conductive component 1 corresponding to the light-transmitting insulating area 211 is welded, the bent and extended area can provide sufficient expansion and contraction during cooling, thereby avoiding the warping problem caused during the welding process of the conductive component 1.
[0037] In one alternative embodiment, the through hole 23 is disposed in the adjacent area of the light-transmitting insulating region 211 and the reflective insulating region 212; or, the through hole 23 is disposed in the light-transmitting insulating region 211 and close to the reflective insulating region 212. Figure 1 as well as Figure 3The number and location of the through holes 23 are merely examples and should not be considered as specific limitations on their placement. It is sufficient to ensure that the first conductive area of the conductive component 1 corresponding to the light-transmitting insulating region 211 can be welded to the solar cells in the photovoltaic module. To ensure complete welding of the first conductive area of the conductive component 1 corresponding to the light-transmitting insulating region 211, this invention preferably places the through holes 23 within the light-transmitting insulating region 211 and close to the reflective insulating region 212.
[0038] In a further optional embodiment, the cross-sectional shape of the through-hole 23 matches that of the conductive element 1. For example, when the conductive element 1 is a flat solder strip, the cross-sectional shape of the through-hole 23 can be rectangular to allow the flat solder strip to pass through. When the conductive element 1 is a cylindrical solder strip, the cross-sectional shape of the through-hole 23 can be circular.
[0039] because Figure 1 In the structure shown, the positional relationship between the conductive component 1 and the insulating tape 2 is relatively complex. Assembling them during the actual fabrication of photovoltaic modules would result in a relatively cumbersome process. Therefore, in an optional embodiment, the conductive component 1 and the insulating tape 2 are an integral structure. That is, during the actual fabrication of photovoltaic modules, it is only necessary to place the integral conductive structure on the photovoltaic module and weld it; it is not necessary to pre-assemble the conductive component 1 and the insulating tape 2 into a conductive structure.
[0040] In one optional embodiment, the insulating tape 2 is made of any one of acrylate, epoxy resin, and silicone types. The materials for the light-transmitting insulating region 211 and the reflective insulating region 212 can be the same or different, and the light transmittance depends on the percentage content of the material. Generally, the higher the percentage content of the material, the lower the light transmittance.
[0041] In one optional embodiment, the thickness of the insulating layer 21 is less than the thickness of the conductive element 1. This is because the thickness of the insulating layer 21 directly determines the light transmittance of the light-transmitting insulating region 211, which in turn affects the welding strength between the conductive element 1 and the PAD point. Therefore, the thickness of the insulating layer 21 should not be too thick. Preferably, the thickness of the insulating layer 21 is no greater than 0.05 mm, and the thickness of the conductive element 1 is 0.1 mm to 0.3 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, etc.
[0042] To ensure the light-transmitting insulating region 211 functions effectively, its size needs to be limited to ensure it is smaller than the size of the PAD point 3. The placement of the PAD point 3 on the solar cell can be as follows: Figure 4 and Figure 5 As shown, Figure 4This is a schematic diagram of the overall structure of the battery cell 100 in this utility model. Figure 5 This is a schematic diagram of the specific structure of the battery cell 100 in this utility model. In an optional embodiment, the first conductive area of the conductive element 1 corresponding to the light-transmitting insulating area 211 contacts the PAD point 3 on the battery cell; in the length direction of the insulating tape 2, the size of the light-transmitting insulating area 211 is less than or equal to the size of the PAD point 3 on the battery cell; the size of the light-transmitting insulating area 211 is greater than the size of the laser spot used to weld the conductive element 1 to the PAD point 3 on the battery cell. By limiting the size of the light-transmitting insulating area 211 in the length direction, it can be ensured that the first conductive area of the conductive element 1 can be completely welded to the PAD point 3, and the length of the welding area in the conductive element 1 will not exceed the outer edge of the PAD point 3.
[0043] Furthermore, in the width direction of the insulating tape 2, the size of the through hole 23 is less than or equal to the size of the PAD point 3 on the battery cell. Similarly, by limiting the size of the through hole 23 in the width direction of the insulating tape 2, it can be ensured that in the direction of the fine grid extension (i.e., the direction perpendicular to the direction of the main grid extension), the first conductive area of the conductive element 1 can also be completely welded to the PAD point 3, and the length of the welded area in the conductive element 1 will not exceed the outer edge of the PAD point 3.
[0044] In summary, the conductive structure for photovoltaic modules provided by this embodiment of the invention, by setting a light-transmitting insulating region 211 in the insulating tape 2 and placing the first conductive region of the conductive element 1 corresponding to the light-transmitting insulating region 211 on the outside of the tape substrate 22 in the insulating tape 2, allows the light-transmitting insulating region 211 to transmit laser light during laser welding, enabling the first conductive region of the conductive element 1 to form effective electrical contact with the solar cell. Furthermore, by setting a reflective insulating region 212, the laser spot outside the light-transmitting insulating region 211 can be reflected, effectively avoiding the problem of discoloration of the insulating adhesive.
[0045] The following is based on Figures 4 to 6 Taking this as an example, the battery string provided by this utility model will be described in detail, wherein, Figure 6 This is a schematic diagram showing the positional relationship between the conductive structure 200 and the battery cell 100 in this utility model.
[0046] from Figure 4 and Figure 6As can be seen, the battery string provided by this utility model includes: multiple battery cells 100 and any of the aforementioned conductive structures 200; wherein, the conductive structure 200 is arranged corresponding to the main grid position of the battery cell 100; the light-transmitting insulating area 211 of the insulating tape 2 corresponds to the PAD point 3 in the battery cell 100, and the first conductive area of the conductive member 1 corresponding to the light-transmitting insulating area 211 abuts against the PAD point 3. Specifically, when the battery cell 100 is a battery cell 100 with a main grid 40, the conductive structure 200 can cover the main grid, that is, in Figure 6 The positions of PAD point 3 and the main grid are not directly visible in the image. When the cell 100 is a cell without a main grid, the conductive structure 200 is still located at the position corresponding to the main grid and is directly connected to PAD point 3 corresponding to the fine grid to realize the extraction of current in the fine grid.
[0047] from Figure 4 and Figure 5 As can be seen, in one optional embodiment, the battery cell 100 provided by this utility model includes a first fine grid 10 and a second fine grid 20 with opposite polarities, and each fine grid with different polarities corresponds to a main grid 40. Therefore, in this utility model, a conductive structure 200 needs to be welded to each of the longitudinally arranged main grids 40 to conduct the current in the multiple main grids 40 respectively. Specifically, multiple PAD points 3 for welding conductive components 1 are arranged at intervals on each main grid 40. That is to say, the conductive components 1 do not actually need to be welded to all the main grids 40, but only to the positions where the PAD points 3 are set. Therefore, in this embodiment of the utility model, by setting the light-transmitting insulating area 211 of the insulating tape 2 to correspond with the PAD points 3, the high light transmittance of the welding area can be retained, while the highly reflective insulating area 212 protects the other non-welding areas, which can effectively avoid mis-welding and overheating problems that may occur during the welding process.
[0048] For example, the width of the insulating tape 2 is preferably smaller than the distance between two adjacent fine grids of the same polarity, such as... Figure 6 The diagram shows a top view of the battery string. Even from this top-down angle, the insulating adhesive printed on the ends of the fine grids on both sides of the insulating tape 2 is still visible. This minimizes the light obstruction caused by the insulating tape 2 to the battery cell 100, thus ensuring the light conversion performance of the battery cell 100 as much as possible.
[0049] In summary, the battery string provided in this embodiment of the present invention, by setting a light-transmitting insulating region 211 in the insulating tape 2 and setting the first conductive region of the conductive element 1 corresponding to the light-transmitting insulating region 211 on the outside of the tape substrate 22 in the insulating tape 2, allows the light-transmitting insulating region 211 to transmit laser light during the laser welding process, enabling the first conductive region of the conductive element 1 to form effective electrical contact with the battery cell. Furthermore, by setting a reflective insulating region 212, the laser spot outside the light-transmitting insulating region 211 can be reflected, effectively avoiding the problem of discoloration of the insulating adhesive.
[0050] The following is based on Figure 7 For example, a photovoltaic module provided by this utility model will be specifically described. The photovoltaic module provided by this utility model includes: a back sheet 300, a cell array 400 encapsulating film 600, and a cover plate 500. The encapsulating film 600 is used to encapsulate the cell array 400 between the back sheet 300 and the cover plate 500. The cell array 400 includes multiple cell strings arranged according to a preset pattern, and the cell strings are any of the above-mentioned cell strings.
[0051] In summary, the photovoltaic module provided by this utility model embodiment, by setting a battery array 400 including the aforementioned battery strings, can achieve effective contact between the first conductive area of the conductive element 1 and the battery cell 100 by utilizing the light-transmitting insulating area 211. At the same time, by setting the reflective insulating area 211, the laser spot outside the contact area between the conductive element 1 and the battery cell 100 can be reflected, effectively avoiding the discoloration problem of the insulating adhesive set at the end of the fine grid, and greatly improving the performance of the photovoltaic module.
[0052] The above steps are provided only to help understand the structure, method, and core idea of this utility model. For those skilled in the art, various improvements and modifications can be made to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.
Claims
1. A conductive structure used in photovoltaic modules, characterized in that, include: An insulating tape (2) with a strip structure, the insulating tape (2) includes an insulating layer (21) and a tape substrate (22) stacked on one side of the insulating layer (21); wherein the insulating layer (21) includes light-transmitting insulating regions (211) and reflective insulating regions (212) arranged alternately along the length direction of the insulating tape (2). The conductive element (1) provided corresponding to the insulating layer (21) has the same extension direction as the insulating tape (2), and the first conductive area of the conductive element (1) corresponding to the light-transmitting insulating area (211) is located on the side of the tape substrate (22) away from the insulating layer (21), so that the first conductive area is electrically connected to the grid line of the cell in the photovoltaic module.
2. The conductive structure according to claim 1, characterized in that, The light transmittance of the light-transmitting insulating region (211) is not less than 90%; And / or, The reflectivity of the reflective insulating region (212) is not less than 90%.
3. The conductive structure according to claim 1, characterized in that, The insulating tape (2) has a plurality of through holes (23) that penetrate its thickness direction at intervals along its length direction. The conductive element (1) passes through a plurality of through holes (23) on the insulating tape (2) in sequence, such that the first conductive area of the conductive element (1) corresponding to the light-transmitting insulating area (211) is located on the side of the tape substrate (22) away from the insulating layer (21), and the second conductive area of the conductive element (1) corresponding to the reflective insulating area (212) is located on the side of the insulating layer (21) away from the tape substrate (22).
4. The conductive structure according to claim 3, characterized in that, The through hole (23) is disposed in the adjacent area of the light-transmitting insulating area (211) and the reflective insulating area (212); or, The through hole (23) is located within the light-transmitting insulating area (211) and close to the reflective insulating area (212).
5. The conductive structure according to claim 3, characterized in that, The cross-sectional shape of the through hole (23) matches that of the conductive element (1).
6. The conductive structure according to claim 1 or 3, characterized in that, The thickness of the insulating layer (21) is no greater than 0.05 mm.
7. The conductive structure according to claim 3, characterized in that, The conductive element (1) is in contact with the first conductive area of the light-transmitting insulating area (211) and the PAD point (3) on the battery cell; In the width direction of the insulating tape (2), the size of the through hole (23) is less than or equal to the size of the PAD point (3) on the battery cell.
8. The conductive structure according to claim 1 or 7, characterized in that, The conductive element (1) is in contact with the first conductive area of the light-transmitting insulating area (211) and the PAD point (3) on the battery cell; Along the length of the insulating tape (2), the size of the light-transmitting insulating area (211) is less than or equal to the size of the PAD point (3) on the battery cell; The size of the light-transmitting insulating region (211) is larger than the size of the laser spot used to weld the conductive element (1) to the PAD point (3) on the battery cell.
9. A battery string, characterized in that, include: Multiple battery cells (100) and any one of the conductive structures (200) according to claims 1 to 8; wherein, The conductive structure (200) is positioned corresponding to the main grid position of the battery cell (100); The light-transmitting insulating area (211) of the insulating tape (2) corresponds to the PAD point (3) in the battery cell (100), and the first conductive area of the conductive element (1) corresponding to the light-transmitting insulating area (211) abuts against the PAD point (3).
10. A photovoltaic module, characterized in that, include: The backplate (300), battery array (400), encapsulating film (600), and cover plate (500) are provided, wherein the encapsulating film (600) is used to encapsulate the battery array (400) between the cover plate (500) and the backplate (300); The battery array (400) includes multiple battery strings arranged according to a preset layout, and the battery strings are those described in claim 9.