Photovoltaic module and preparation method thereof

Abstract

The invention discloses a photovoltaic module and a preparation method of the photovoltaic module, and belongs to the technical field of photovoltaics. Comprising a plurality of battery strings which are sequentially arranged in the first direction, each battery string comprises a plurality of battery pieces which are sequentially arranged in the second direction, and the back face of each battery piece is provided with a plurality of first current collection grid lines and a plurality of second current collection grid lines which extend in the first direction and are alternately arranged at intervals in the second direction; the connecting pieces extend in the second direction and are arranged on the back faces of the battery pieces, the connecting pieces are constructed to be connected with the multiple battery pieces in series, the connecting pieces comprise the first connecting pieces and the second connecting pieces, and insulating blocks are arranged in the intersection areas of the first current collection grid lines and the second connecting pieces and the intersection areas of the second current collection grid lines and the first connecting pieces; the glue points are arranged on the back face of the battery piece and located in the edge area of the battery piece in the second direction, and the glue points at least cover one part of one insulation block and one part of the first current collection grid line and / or the second current collection grid line adjacent to the insulation block in the second direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic modules, in particular to a photovoltaic module and a preparation method thereof. BACKGROUND

[0002] The photovoltaic module comprises a cell string, the cell string comprises a plurality of cell pieces arranged in sequence and a solder strip connected between at least two adjacent cell pieces, the at least two adjacent cell pieces are connected in series through the solder strip to form the cell string. The surface of the cell piece is provided with a plurality of fine grids extending along a first direction, and the fine grids are used to collect the carriers generated by the cell piece. The solder strip extends along a second direction and is electrically connected to the plurality of fine grids to collect the carriers collected by the plurality of fine grids and transmit the collected carriers to an external circuit.

[0003] In the related art, the surface of the cell piece is provided with a solder pad, the solder pad is used to conduct the solder strip and the fine grid, so that the carriers collected by the fine grid can be transmitted to the external circuit through the solder strip. The surface of the cell piece is also provided with a glue point, the glue point is located between the solder strip and the cell piece, and the glue point is used to bond the solder strip to the surface of the cell piece to fix the solder strip.

[0004] However, the glue point is prone to overflow onto the solder pad, which affects the electrical connection reliability between the solder pad and the solder strip, and further affects the photoelectric conversion efficiency of the photovoltaic module. SUMMARY

[0005] The present application discloses a photovoltaic module and a preparation method thereof, to solve or at least partially solve the problem that the glue point is prone to overflow onto the solder pad, which affects the electrical connection reliability between the solder pad and the solder strip, and further affects the photoelectric conversion efficiency of the photovoltaic module. In order to solve the above technical problems, the present application is realized as follows: In a first aspect, the present application discloses a photovoltaic module, comprising a cell string, the cell string comprising a plurality of cell strings arranged in a first direction, each cell string comprising a plurality of cell pieces arranged in a second direction, the back surface of each cell piece being provided with a plurality of first current collecting grid lines and a plurality of second current collecting grid lines extending in the first direction and alternately and spacedly arranged in the second direction, the second direction intersecting the first direction; a connecting piece extending in the second direction and spacedly arranged on the back surface of the cell piece in the first direction, the connecting piece being configured to connect the plurality of cell pieces in series, the connecting piece comprising a first connecting piece and a second connecting piece, the first connecting piece being electrically connected with the first current collecting grid lines and insulated from the second current collecting grid lines, the second connecting piece being electrically connected with the second current collecting grid lines and insulated from the first current collecting grid lines, the extension line of the first current collecting grid lines and the intersection area of the second connecting piece and the extension line of the second current collecting grid lines being provided with an insulating block; a glue spot arranged on the back surface of the cell piece and located in the edge region of the cell piece in the second direction, the glue spot being used for fixing the connecting piece on the back surface of the cell piece, the glue spot covering at least a part of the insulating block and a part of the first current collecting grid lines and / or the second current collecting grid lines adjacent to the insulating block in the second direction.

[0006] In some embodiments, the photovoltaic module further comprises a plurality of solder pads arranged in the second direction on the back surface of the cell piece, the solder pads being electrically connected with one of the first current collecting grid lines and the second current collecting grid lines and insulated from the other one of the first current collecting grid lines and the second current collecting grid lines, the solder pads comprising an edge solder pad located at the outermost edge of the cell piece in the second direction; the glue spot being arranged between the edge solder pad and the edge of the cell piece.

[0007] In some embodiments, in the second direction, the center of the glue spot is located between two adjacent insulating blocks.

[0008] In some embodiments, in the second direction, the center of the glue spot is located between two adjacent first current collecting grid lines and / or second current collecting grid lines.

[0009] In some embodiments, in the first direction, the size of the glue spot is greater than the size of the insulating block.

[0010] In some embodiments, in the second direction, the edge solder pad and the corresponding edge of the cell piece have a first distance L1, satisfying L1≥2mm.

[0011] In some embodiments, in the second direction, the distance between the edge of the adhesive dot near the edge pad and the edge of the edge pad near the adhesive dot is greater than or equal to 0 mm; and / or, in the second direction, the distance between the center of the adhesive dot and the side of the edge pad near the adhesive dot is L2, satisfying 0.6 mm ≤ L2 ≤ 7.0 mm.

[0012] In some embodiments, the condition 1.2mm≤L2≤4.5mm is satisfied.

[0013] In some embodiments, along the thickness direction of the photovoltaic module, the thickness of the insulating block is h1, satisfying 20μm≤h1≤60μm; and / or, the thickness of the adhesive dot is h2, satisfying 90μm≤h2≤350μm.

[0014] In some embodiments, the thickness of the edge pad along the thickness direction of the photovoltaic module is h3, satisfying 1μm≤h3≤8μm.

[0015] In some embodiments, along the thickness direction of the photovoltaic module, a bonding layer is provided on the side of the edge pad away from the cell, and the thickness of the bonding layer is h4, satisfying 60μm≤h4≤120μm.

[0016] In some embodiments, 50μm≤h1+h2-h3-h4≤300μm is satisfied.

[0017] In some embodiments, 100μm≤h1+h2-h3-h4≤200μm is satisfied.

[0018] In some embodiments, along the first direction, the size of the adhesive dot is L3, satisfying 0.6mm≤L3≤3mm.

[0019] In some embodiments, along the thickness direction of the photovoltaic module, at the location of the adhesive dot, the height of the connector is h5, satisfying 255μm≤h5≤355μm.

[0020] In some embodiments, 270μm≤h5≤310μm is satisfied.

[0021] In some embodiments, along the thickness direction of the photovoltaic module, at the location of the edge pad, the height of the connector is h6, satisfying 205μm≤h6≤305μm.

[0022] In some embodiments, the following conditions are met: 230μm≤h6≤270μm.

[0023] In some embodiments, in the second direction, the length of the portion of the connector located between the adhesive dot and the side of the battery cell is L4, satisfying 0mm≤L4≤1.0mm.

[0024] In some embodiments, when L4 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm, the height of the end of the connector along the thickness direction of the photovoltaic module is h7, satisfying 280 μm ≤ h7 ≤ 360 μm.

[0025] In some embodiments, when L4 is greater than or equal to 0.9 mm and less than or equal to 1.0 mm, the height of the end of the connector along the thickness direction of the photovoltaic module is h7, satisfying 290 μm ≤ h7 ≤ 380 μm.

[0026] In some embodiments, in the second direction, there is a first gap between two adjacent solar cells, and along the thickness direction of the photovoltaic module, the portion of the connector opposite to the first gap has a recess.

[0027] In some embodiments, the adhesive dots are at least partially disposed between the back side of the battery cell and the connector; and / or, at least partially exposed on the side of the connector away from the battery cell from the adhesive dots.

[0028] In some embodiments, in the second direction, the size of the adhesive dot is L5, and there is a first distance L1 between the edge pad and the corresponding edge of the battery cell, satisfying 0.2≤L5 / L1≤0.8.

[0029] In some embodiments, in the first direction, the size of the adhesive dot is L3, and the length of the insulating block is L6, satisfying 1≤L3 / L6≤15.

[0030] In some embodiments, the battery cell includes a first battery cell, the first connector has a first projection on the plane of the first battery cell, the adhesive dot has a second projection on the plane of the first battery cell, and the end of the first projection in the second direction falls into the second projection.

[0031] In some embodiments, the battery cell further includes a second battery cell, the second battery cell and the first battery cell being arranged sequentially in the second direction; one end of the second connector is disposed on the back side of the first battery cell, and the other end extends along the second direction to the back side of the second battery cell; the distance between the adhesive dot located between the second connector and the first battery cell and the edge of the first battery cell near the second battery cell is L7, and the distance between the adhesive dot located between the first connector and the first battery cell and the edge of the first battery cell near the second battery cell is L8, satisfying L7 < L8.

[0032] Secondly, this application also discloses a method for manufacturing a photovoltaic module. The method includes providing a solar cell, wherein the back side of the solar cell is provided with a plurality of first current collector lines and a plurality of second current collector lines extending along a first direction and alternately spaced along a second direction, the second direction intersecting the first direction; a plurality of sets of insulating blocks are provided on the back side of the solar cell, the plurality of sets of insulating blocks being spaced apart along the first direction, with one set of adjacent sets of insulating blocks covering the side of the first current collector lines away from the solar cell, and the other set covering the side of the second current collector lines away from the solar cell; adhesive dots are provided on the back side of the solar cell, the adhesive dots being located in the edge region of the solar cell in the second direction; and a plurality of insulating blocks are provided on the back side of the solar cell. A connector extending along the second direction is disposed on the side of the adhesive dot away from the battery cell, so as to fix the connector to the surface of the battery cell through the adhesive dot; wherein, the connector is connected in series with at least two adjacent battery cells, the connector includes a first connector and a second connector, the first connector is electrically connected to the first current collector line and insulated from the second current collector line through the insulating block, the second connector is electrically connected to the second current collector line and insulated from the first current collector line through the insulating block; the adhesive dot covers at least a portion of the insulating block and a portion of the first current collector line and / or the second current collector line adjacent to the insulating block along the second direction.

[0033] In some embodiments, before providing a connector extending along the second direction on the back side of the battery cell, the method further includes: providing a pad on the back side of the battery cell, the pad comprising a plurality of pads arranged sequentially along the second direction on the back side of the battery cell, the pad being electrically connected to one of the first current collector line and the second current collector line, and insulated from the other of the first current collector line and the second current collector line, the pad including an edge pad located on the outermost side of the battery cell in the second direction; the adhesive dot being disposed between the edge pad and the edge of the battery cell.

[0034] In some embodiments, at least one insulating block is provided between the edge pad and the adhesive dot.

[0035] In some embodiments, the method further includes: pressing the connector with a pin to fix the connector to the surface of the battery cell with adhesive dots.

[0036] This application discloses a photovoltaic module and a method for manufacturing a photovoltaic module. The photovoltaic module includes multiple battery strings arranged sequentially along a first direction. Each battery string includes multiple solar cells arranged sequentially along a second direction. Each solar cell has multiple first current collector lines and multiple second current collector lines extending along the first direction and alternately spaced along the second direction on its back side. The second direction intersects the first direction. A connector extends along the second direction and is spaced along the back side of the solar cells along the first direction. The connector is configured to connect multiple solar cells in series. The connector includes a first connector and a second connector. The first connector is electrically connected to the first current collector line and insulated from the second current collector line. The second connector is electrically connected to the second current collector line and insulated from the first current collector line. Insulating blocks are provided at the intersection areas of the extension lines of the first current collector line and the second connector, and at the intersection areas of the extension lines of the second current collector line and the first connector. Adhesive dots are provided on the back side of the battery cell and located at the edge area of ​​the battery cell in the second direction. The adhesive dots are used to fix the connector to the back side of the battery cell. The adhesive dots cover at least a portion of one of the insulating blocks and a portion of the first current collector line and / or the second current collector line adjacent to the insulating block along the second direction.

[0037] The photovoltaic module disclosed in this application includes a plurality of cell strings arranged sequentially along a first direction. Each cell string includes a plurality of cell cells arranged sequentially along a second direction. The back of each cell cell is provided with a plurality of first and second collector grid lines extending along the first direction and arranged alternately along the second direction, so as to collect the charge carriers generated by the cell cell through the first and second collector grid lines.

[0038] Furthermore, connectors extend along a second direction and are spaced apart along the back of the solar cells along a first direction, connecting multiple solar cells in series to form a solar cell string. The first connector is electrically connected to the first collector grid line to collect the charge carriers gathered by the first collector grid line and transmit the collected charge carriers to an external circuit. An insulating block is provided at the intersection of the first connector and the extension of the second collector grid line to insulate the first connector and the second collector grid line, preventing partial short circuits in the photovoltaic module. The second connector is electrically connected to the second collector grid line to collect the charge carriers gathered by the second collector grid line and transmit the collected charge carriers to an external circuit. An insulating block is also provided at the intersection of the second connector and the extension of the first collector grid line to insulate both the second connector and the first collector grid line, preventing partial short circuits in the photovoltaic module.

[0039] Furthermore, adhesive dots are provided on the back of the solar cell. In the second direction, the adhesive dots are located in the edge area of ​​the solar cell. The connectors are fixed to the back of the solar cell by the adhesive dots to fix the connectors and prevent them from shifting, contacting and conducting with other non-standard grid lines or connectors, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0040] Furthermore, the adhesive dots cover at least a portion of an insulating block and the first and / or second current collector lines adjacent to the insulating block along the second direction, so as to form a receiving groove by the insulating block, the adjacent first and / or second current collector lines and the back of the cell. The receiving groove can accommodate the adhesive dots, increase the difficulty of the adhesive dots overflowing in the second direction, thereby preventing the adhesive dots from overflowing onto the edge pads, improving the reliability of the electrical connection between the edge pads and the connectors, and ensuring the photoelectric conversion efficiency of the photovoltaic module. Attached Figure Description

[0041] Figure 1 This diagram illustrates the structure of the battery cell described in the embodiments of this application. Figure One ; Figure 2 This diagram illustrates the structure of the battery cell described in the embodiments of this application. Figure Two ; Figure 3 This diagram illustrates the structure of the battery cell described in the embodiments of this application. Figure Three ; Figure 4 This diagram illustrates the structure of the battery cell described in the embodiments of this application. Figure Four ; Figure 5 This diagram illustrates the structure of the battery cell described in the embodiments of this application. Figure Five ; Figure 6This shows a cross-sectional view of the photovoltaic module described in the embodiments of this application in a second direction. Figure One ; Figure 7 This shows a cross-sectional view of the photovoltaic module described in the embodiments of this application in a first direction. Figure One ; Figure 8 This shows a cross-sectional view of the photovoltaic module described in the embodiments of this application in a second direction. Figure Two ; Figure 9 This shows a cross-sectional view of the photovoltaic module described in the embodiments of this application in a first direction. Figure Two ; Figure 10 This shows a cross-sectional view of the photovoltaic module described in the embodiments of this application in a first direction. Figure Three ; Figure 11 This shows a cross-sectional view of the photovoltaic module described in the embodiments of this application in a second direction. Figure Three ; Figure 12 This is a schematic diagram of the structure of the photovoltaic module described in the embodiments of this application; Figure 13 This is a flowchart illustrating the photovoltaic module manufacturing method described in the embodiments of this application.

[0042] Figure label: 10: Solar cell; 11: First collector grid line; 12: Second collector grid line; 20: Pad; 21: Edge pad; 30: Connecting cable; 40: Glue dots; 50: Insulating block; 60: Connector; 61: First connector; 62: Second connector; X: First direction; Y: Second direction. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of the present invention.

[0044] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0045] This application discloses a photovoltaic module, which includes multiple battery strings arranged sequentially along a first direction X. Each battery string includes multiple solar cells 10 arranged sequentially along a second direction Y. Each solar cell 10 has multiple first current collector lines 11 and multiple second current collector lines 12 extending along the first direction X and alternately spaced along the second direction Y on its back side. The second direction Y intersects the first direction X. A connector 60 extends along the second direction Y and is spaced along the back side of the solar cells 10 along the first direction X. The connector 60 is configured to connect multiple solar cells 10 in series. The connector 60 includes a first connector 61 and a second connector 62. The first connector 61 is connected to the first... The collector grid line 11 is electrically connected and insulated from the second collector grid line 12. The second connector 62 is electrically connected to the second collector grid line 12 and insulated from the first collector grid line 11. Insulating blocks 50 are provided in the intersection areas of the extension lines of the first collector grid line 11 and the second connector 62, and in the intersection areas of the extension lines of the second collector grid line 12 and the first connector 61. Adhesive dots 40 are provided on the back side of the battery cell 10 and located in the edge area of ​​the battery cell 10 in the second direction Y. The adhesive dots 40 are used to fix the connector 60 to the back side of the battery cell 10. The adhesive dots 40 cover at least a portion of an insulating block 50 and a portion of the first collector grid line 11 and / or the second collector grid line 12 adjacent to the insulating block 50 in the second direction Y.

[0046] This application discloses a photovoltaic module, which is a back-contact photovoltaic module, possessing advantages such as high photoelectric conversion efficiency and a more aesthetically pleasing appearance. The photovoltaic module includes a battery string, connectors 60, and adhesive dots 40. The battery string, as the core component of the photovoltaic module, converts solar energy into electrical energy. On the plane containing the battery string, the photovoltaic module has intersecting first direction X and second direction Y. Exemplarily, the first direction X is the length direction of the photovoltaic module, and the second direction Y is the width direction of the photovoltaic module. Alternatively, the first direction X is the width direction of the photovoltaic module, and the second direction Y is the length direction of the photovoltaic module.

[0047] The photovoltaic module disclosed in this application includes multiple battery strings arranged sequentially along a first direction X, such as... Figure 12As shown, each battery string includes multiple battery cells 10 arranged sequentially along the second direction Y. Each battery cell 10 has a front and a back side arranged opposite each other; the front side is the sun-receiving surface facing the sunlight, and the back side is the shaded surface facing away from the sunlight. Figures 1 to 5 As shown, each solar cell 10 has multiple first collector grid lines 11 and multiple second collector grid lines 12 arranged alternately along a first direction X and a second direction Y on its back side. The first collector grid lines 11 and the second collector grid lines 12 have opposite conductivity types. The multiple first collector grid lines 11 and the multiple second collector grid lines 12 collect the charge carriers generated by the solar cell 10.

[0048] In this embodiment, multiple connectors 60 are included, each extending along the second direction Y and spaced apart along the first direction X on the back of the battery cell 10, so as to connect multiple battery cells 10 in series through the multiple connectors 60 to form a battery string. For example, Figure 12 As shown, the connector 60 includes a first connector 61 and a second connector 62. The first connector 61 is electrically connected to multiple first collector grid lines 11 to collect the charge carriers gathered by the multiple first collector grid lines 11 and transmit the collected charge carriers to an external circuit. An insulating block 50 is provided at the intersection of the first connector 61 and the extension line of each second collector grid line 12 to insulate the first connector 61 and the corresponding second collector grid line 12, preventing the first connector 61 and the second collector grid line 12 from conducting and causing a partial short circuit in the photovoltaic module, thus affecting the photovoltaic conversion efficiency of the photovoltaic module.

[0049] The second connector 62 is electrically connected to multiple second collector grid lines 12 to collect the charge carriers gathered by the second connector 62 and transmit the collected charge carriers to an external circuit. An insulating block 50 is provided at the intersection of the second connector 62 and the extension line of each first collector grid line 11 to insulate the second connector 62 and the corresponding first collector grid line 11, preventing the second connector 62 and the first collector grid line 11 from conducting and causing a partial short circuit in the photovoltaic module, thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0050] The intersection area of ​​the first connector 61 and the extension line of the second collector grid line 12 refers to the area surrounding the intersection of the extension lines of the first connector 61 extending along the second direction Y and the second collector grid line 12 extending along the first direction X. Similarly, the intersection area of ​​the second connector 62 and the extension line of the first collector grid line 11 refers to the area surrounding the intersection of the extension lines of the second connector 62 extending along the second direction Y and the first collector grid line 11 extending along the first direction X.

[0051] It should be noted that the connector 60 in this embodiment is conductive. The connector 60 includes, but is not limited to, solder strips, metal wires, etc. The connector 60 can be a rectangular connector, a near-rectangular connector, a spindle-shaped connector, an elliptical connector, or a triangular connector. In this embodiment, the specific type of connector 60 is not limited; in practical applications, those skilled in the art can choose according to their needs.

[0052] Among them, rectangular connectors refer to rectangular connectors with chamfers, including but not limited to rounded chamfers and square chamfers.

[0053] In this embodiment, adhesive dots 40 are provided on the back of the solar cell 10. The adhesive dots 40 are located in the edge area of ​​the solar cell 10 in the second direction Y, so as to bond the connector 60 to the back of the solar cell 10 through the adhesive dots 40, fix the connector 60, and prevent the connector 60 from shifting, contacting and conducting with the irregular grid lines or connectors, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0054] It should be noted that, in this embodiment, the adhesive dot 40 covers at least a portion of an insulating block 50 and a portion of the first current collector line 11 and / or the second current collector line 12 adjacent to the insulating block 50 in the second direction Y. This forms a receiving groove enclosed by the insulating block 50, the adjacent first current collector line 11 and / or the second current collector line 12, and the back surface of the solar cell 10. This receiving groove can accommodate the adhesive dot 40, increasing the difficulty of the adhesive dot 40 overflowing in the second direction Y, thereby preventing the adhesive dot 40 from overflowing onto the edge pad 21, improving the reliability of the electrical connection between the edge pad 21 and the connector 60, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0055] Furthermore, the insulating block 50 and the first current collector line 11 and / or the second current collector line 12 adjacent to the insulating block 50 in the second direction Y can also support the connector 60, reducing or avoiding direct contact between the connector 60 and the back of the cell 10, preventing direct contact between the connector 60 and the cell 10, which could lead to defects such as microcracks or fragments in the cell 10, thereby improving the process yield of the photovoltaic module.

[0056] Furthermore, the above-mentioned configuration can reduce the amount of adhesive material used in the adhesive dots 40, thereby saving on the manufacturing cost of photovoltaic modules. It can also reduce the height of the adhesive dots 40 relative to the connectors 60 in the height direction of the photovoltaic module, ensuring the flatness between the connectors 60 and the cell strings, thus reducing the thickness and filler amount of the encapsulating film, lowering the manufacturing cost of photovoltaic modules, and enhancing the product competitiveness of photovoltaic modules.

[0057] In some embodiments, such as Figures 1 to 5 As shown, the photovoltaic module disclosed in this application embodiment also includes pads 20. The pads 20 include a plurality of pads, which are arranged sequentially along the second direction Y on the back side of the cell 10. The pads 20 are electrically connected to one of the first current collector line 11 and the second current collector line 12, and are insulated from the other of the first current collector line 11 and the second current collector line 12. The pads 20 include an edge pad 21 located on the outermost side of the cell 10 in the second direction Y. Adhesive dots 40 are disposed between the edge pad 21 and the edge of the cell 10.

[0058] For example, the back of the solar cell 10 is provided with a plurality of pads 20 arranged sequentially along the second direction Y. In the thickness direction of the photovoltaic module, one side of each pad 20 is electrically connected to a first collector grid line 11, and the other side is electrically connected to a first connector 61. Thus, the first connector 61 is connected to the corresponding first collector grid line 11 through the pads 20, so as to collect the charge carriers collected by the first collector grid line 11. The pads 20 are insulated from the second collector grid line 12 to prevent the second collector grid line 12 from being connected to the first connector 61, which could cause a partial short circuit in the photovoltaic module.

[0059] For example, the back of the solar cell 10 is provided with multiple pads 20 arranged sequentially along the second direction Y. In the thickness direction of the photovoltaic module, one side of each pad 20 is electrically connected to a second current collector line 12, and the other side is electrically connected to a second connector 62. Thus, the second connector 62 is made conductive with the corresponding second current collector line 12 through the pads 20, so as to collect the charge carriers collected by the second current collector line 12. The pads 20 are insulated from the first current collector line 11 to prevent the first current collector line 11 from being conductive with the second connector 62, which could cause a partial short circuit in the photovoltaic module.

[0060] It should be noted that, in the second direction Y, the outermost pad 20 of the solar cell 10 is the edge pad 21. That is, the edge pad 21 is the pad 20 closest to the edge of the solar cell 10 in the second direction Y. A connecting line 30 is provided in the area of ​​the edge pad 21 near the edge of the solar cell 10, and the connecting line 30 is electrically connected to the edge pad 21. Furthermore, the connecting line 30 is conductive to one of the first collector grid line 11 and the second collector grid line 12, and insulated from the other of the first collector grid line 11 and the second collector grid line 12, so as to collect the charge carriers generated by the first collector grid line 11 or the second collector grid line 12 in the edge region of the solar cell 10 through the connecting line 30, and transmit the collected charge carriers to the first connector 61 or the second connector 62 through the edge pad 21.

[0061] In this embodiment, adhesive dots 40 are disposed in the second direction Y between the edge pad 21 and the edge of the solar cell 10. Since the charge carriers in the edge region of the solar cell 10 can be collected through the connecting lines 30, the placement of adhesive dots 40 does not affect the width of the gap between the first collector grid line 11 and the second collector grid line 12 in the second direction Y. In other words, the placement of adhesive dots 40 does not affect the collection efficiency of the first collector grid line 11 and the second collector grid line 12 for the charge carriers in the edge region of the solar cell 10, thereby helping to ensure the photoelectric conversion efficiency of the solar cell.

[0062] Furthermore, adhesive dots 40 are positioned between the edge pads 21 and the edges of the solar cells 10. On one hand, this further prevents adhesive dots 40 from overflowing onto the edge pads 21, thus avoiding impacting the reliability of the electrical connection between the edge pads 21 and the connector 60, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module. On the other hand, it also prevents adhesive dots 40 from overflowing onto the edge pads 21. In the thickness direction of the photovoltaic module, the thickness of the edge pads 21 and the adhesive dots 40 overlaps, raising the connector 60. This ensures the flatness between the connector 60 and the cell string, reduces the encapsulation thickness and filler amount of the adhesive film in the photovoltaic module, and reduces air bubbles in the adhesive film during the encapsulation process. Therefore, it improves the reliability of the photovoltaic module while reducing its cost.

[0063] In some embodiments, such as Figure 6 As shown, in the second direction Y, the center of the adhesive dot 40 is located between two adjacent insulating blocks 50.

[0064] Because the insulating block 50 is taller than the first collector grid line 11 and the second collector grid line 12 in the thickness direction of the photovoltaic module, two adjacent insulating blocks 50 and the back of the solar cell 10 located between the two adjacent insulating blocks 50 can form a deeper receiving groove. The center of the adhesive dot 40 is located between the two adjacent insulating blocks 50, which further increases the difficulty of the adhesive dot 40 overflowing in the second direction Y, thereby further preventing the adhesive dot 40 from overflowing onto the edge pad 21 and affecting the reliability of the electrical connection between the edge pad 21 and the connector 60. In other words, the above arrangement helps to improve the reliability of the electrical connection between the edge pad 21 and the connector 60, thereby further ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0065] In some embodiments, such as Figure 8 As shown, in the second direction Y, the center of the adhesive dot 40 is located between two adjacent first collector grid lines 11 and / or second collector grid lines 12.

[0066] In the second direction Y, the back side of the solar cell 10 between two adjacent first current collector lines 11 and / or second current collector lines 12 can also be enclosed to form a receiving groove of a certain depth. The center of the adhesive dot 40 is located between two adjacent first current collector lines 11 and / or second current collector lines 12, which can also increase the difficulty of the adhesive dot 40 overflowing in the second direction Y, and prevent the adhesive dot 40 from overflowing onto the edge pad 21, affecting the reliability of the electrical connection between the edge pad 21 and the connector 60. In other words, the above arrangement helps to improve the reliability of the electrical connection between the edge pad 21 and the connector 60, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0067] In some embodiments, such as Figure 7 and Figure 10 As shown, in the first direction X, the size of the adhesive dot 40 is larger than the size of the insulating block 50.

[0068] In this embodiment, the size of the adhesive dot 40 in the first direction X is set to be larger than the size of the insulating block 50 in the first direction X, so as to improve the reliability of the adhesive dot 40 in fixing the connector 60 to the back of the cell 10, and avoid the part of the connector 60 near the edge of the cell 10 from forming a free end. This free end is easy to contact and conduct with the irregular grid line or irregular connector, which will cause a partial short circuit in the photovoltaic module and affect the reliability of the photovoltaic module.

[0069] In some embodiments, in the second direction Y, there is a first distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10, satisfying L1≥2mm.

[0070] like Figure 1As shown, the battery cell 10 has a first edge and a second edge disposed opposite to each other in the second direction Y. Two edge pads 21 are also included, one near the first edge of the battery cell 10 and the other near the second edge of the battery cell 10. A first distance L1 exists between the edge pad 21 near the first edge of the battery cell 10 and the first edge of the battery cell 10, and a first distance L1 also exists between the edge pad 21 near the second edge of the battery cell 10 and the second edge of the battery cell 10. The two L1 values ​​can be equal or unequal. That is, the distance between the edge pad 21 near the first edge of the battery cell 10 and the first edge of the battery cell 10 can be equal to or unequal to the distance between the edge pad 21 near the second edge of the battery cell 10 and the second edge of the battery cell 10. Preferably, the distance between the edge pad 21 near the first edge of the battery cell 10 and the first edge of the battery cell 10 is equal to the distance between the edge pad 21 near the second edge of the battery cell 10 and the second edge of the battery cell 10. In this embodiment of the application, in the second direction Y, the first distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10 is set to be greater than or equal to 2mm, so that the area between the edge pad 21 and the corresponding edge of the battery cell 10 is large enough, and the adhesive dots 40 can be set between the edge pad 21 and the corresponding edge of the battery cell 10. Sufficient arrangement space is reserved for the setting of the adhesive dots 40, so as to avoid the adhesive dots 40 and the edge pad 21 being too close in the second direction Y, and the adhesive dots 40 easily overflowing to the surface of the edge pad 21.

[0071] For example, in the second direction Y, the first distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10 can be set to 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, etc.

[0072] In some embodiments, in the second direction Y, the distance between the edge of the adhesive dot 40 near the edge pad 21 and the edge of the edge pad 21 near the adhesive dot 40 is greater than or equal to 0 mm; and / or, in the second direction Y, the distance between the center of the adhesive dot 40 and the side of the edge pad 21 near the adhesive dot 40 is L2, satisfying 0.6 mm ≤ L2 ≤ 7.0 mm.

[0073] In this embodiment, in the second direction Y, the distance between the edge of the adhesive dot 40 near the edge pad 21 and the edge of the edge pad 21 near the adhesive dot 40 is set to be greater than or equal to 0 mm. This ensures the fixing effect of the adhesive dot 40 on the connector 60, preventing the connector 60 from shifting and contacting and conducting with other irregular grid lines or irregular connectors, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module. Furthermore, the consumption of adhesive material in the adhesive dot 40 can be controlled, thereby controlling the manufacturing cost of the photovoltaic module and improving its product competitiveness.

[0074] In this embodiment, the distance L2 between the center of the adhesive dot 40 and the side of the edge pad 21 closest to the adhesive dot 40 in the second direction Y is set to be greater than or equal to 0.6 mm. Typically, the center of the adhesive dot 40 has the greatest thickness. During printing, the center of the adhesive dot 40 spreads, leveles, and cures outwards. This setting ensures that the distance between the center of the adhesive dot 40 and the side of the edge pad 21 closest to the adhesive dot 40 in the second direction Y is sufficiently large, thereby preventing the adhesive dot 40 from overflowing onto the edge pad 21 and affecting the reliability of the electrical connection between the edge pad 21 and the connector 60, thus ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0075] Furthermore, in the second direction Y, if the side of the edge pad 21 closest to the adhesive dot 40 is relatively far from the center of the adhesive dot 40, that is, if the edge pad 21 is far from the corresponding edge of the cell 10, it will affect the collection efficiency of the edge pad 21 for carriers in the edge region of the cell 10, thereby affecting the photoelectric conversion efficiency of the photovoltaic module and resulting in a lower photoelectric conversion efficiency. Therefore, in the second direction Y, setting the distance L2 between the center of the adhesive dot 40 and the side of the edge pad 21 closest to the adhesive dot 40 to be less than or equal to 7.0 mm helps to improve the photoelectric conversion efficiency of the photovoltaic module.

[0076] For example, in the second direction Y, the distance L2 between the center of the adhesive dot 40 and the side of the edge pad 21 near the adhesive dot 40 can be set to 0.6mm, 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, etc.

[0077] In a preferred embodiment, the following condition is met: 1.2mm ≤ L2 ≤ 4.5mm.

[0078] In a preferred embodiment of this application, the distance L2 between the center of the adhesive dot 40 and the side of the edge pad 21 closest to the adhesive dot 40 in the second direction Y is set to be greater than or equal to 1.2 mm. This further increases the distance between the center of the adhesive dot 40 and the side of the edge pad 21 closest to the adhesive dot 40 in the second direction Y, thereby preventing the adhesive dot 40 from overflowing onto the edge pad 21 and affecting the reliability of the electrical connection between the edge pad 21 and the connector 60, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0079] Furthermore, in this embodiment, in the second direction Y, the distance L2 between the center of the adhesive dot 40 and the side of the edge pad 21 near the adhesive dot 40 is set to be less than or equal to 4.5 mm to further ensure the carrier collection efficiency of the edge region of the solar cell 10. Moreover, the above setting can also prevent the connector 60 in the edge region of the solar cell 10 from shifting. If the connector 60 shifts, it is easy to contact and conduct with irregular grid lines or irregular connectors, leading to a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module. In other words, the above setting helps to further ensure the photoelectric conversion efficiency of the photovoltaic module.

[0080] For example, in the second direction Y, the distance L2 between the center of the adhesive dot 40 and the side of the edge pad 21 near the adhesive dot 40 can be set to 1.2mm, 1.5mm, 2.5mm, 3.5mm, 4.5mm, etc.

[0081] In some embodiments, along the thickness direction of the photovoltaic module, the thickness of the insulating block 50 is h1, satisfying 20μm≤h1≤60μm; and / or, the thickness of the adhesive dot 40 is h2, satisfying 90μm≤h2≤350μm.

[0082] In this embodiment, the thickness h1 of the insulating block 50 is set to be greater than or equal to 20 μm and less than or equal to 60 μm in the thickness direction of the photovoltaic module. This ensures that the insulating block 50 is sufficiently thick in the thickness direction of the photovoltaic module. Two adjacent insulating blocks 50 and the back side of the solar cell 10 located between the two adjacent insulating blocks 50 can form a deeper receiving groove. This receiving groove increases the difficulty of the adhesive dots 40 overflowing in the second direction Y, thereby preventing the adhesive dots 40 from overflowing onto the edge pads 21 and affecting the reliability of the electrical connection between the edge pads 21 and the connector 60. In other words, the above arrangement helps improve the reliability of the electrical connection between the edge pads 21 and the connector 60, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0083] Furthermore, the above-mentioned arrangement can also prevent the insulating block 50 from being too thick in the thickness direction of the photovoltaic module, thus avoiding excessive material consumption of the insulating block 50, which would lead to excessively high costs for the photovoltaic module and affect the product competitiveness of the photovoltaic module.

[0084] For example, in the thickness direction of the photovoltaic module, the thickness h1 of the insulating block 50 can be set to 20μm, 30μm, 40μm, 50μm, 60μm, etc.

[0085] In this embodiment, the thickness h2 of the adhesive dots 40 is set to be greater than or equal to 90 μm and less than or equal to 350 μm in the thickness direction of the photovoltaic module, so that the adhesive dots 40 are thick enough in the thickness direction of the photovoltaic module, thereby more reliably bonding the connector 60 to the back of the cell 10, and preventing the connector 60 from shifting near the edge of the cell 10 in the second direction Y, and from contacting and conducting with other non-standard grid lines or non-standard connectors, which would cause a local short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0086] Furthermore, it can also prevent the adhesive dots 40 from being too thick in the thickness direction of the photovoltaic module, which would lead to excessive material consumption of the adhesive dots 40, resulting in excessively high costs for the photovoltaic module and affecting the product competitiveness of the photovoltaic module.

[0087] For example, in the thickness direction of the photovoltaic module, the thickness h2 of the adhesive dot 40 can be set to 90μm, 120μm, 150μm, 180μm, 200μm, 230μm, 260μm, 300μm, 320μm, 350μm, etc.

[0088] In some embodiments, the thickness of the edge pad 21 along the thickness direction of the photovoltaic module is h3, satisfying 1μm≤h3≤8μm.

[0089] In this embodiment, the thickness h3 of the edge pad 21 is set to be greater than or equal to 1 μm and less than or equal to 8 μm in the thickness direction of the photovoltaic module. This ensures that the edge pad 21 is sufficiently thick in the thickness direction of the photovoltaic module to connect the connector 60 to the first collector grid line 11 or the second collector grid line 12, allowing the charge carriers collected by the first collector grid line 11 or the second collector grid line 12 to be transferred to the connector 60 through the edge pad 21. Furthermore, this setting can also reduce the sum of the resistance of the edge pad 21 and the resistance of the connector 60, improving the conductivity efficiency of the edge pad 21 and the connector 60, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0090] Furthermore, the above-mentioned configuration can also prevent the edge pads 21 from being too thick in the thickness direction of the photovoltaic module, thus avoiding excessive material consumption of the edge pads 21, which would lead to excessively high manufacturing costs of the photovoltaic module and affect the product competitiveness of the photovoltaic module.

[0091] For example, the thickness h3 of the edge pad 21 in the thickness direction of the photovoltaic module can be set to 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, etc.

[0092] In some embodiments, along the thickness direction of the photovoltaic module, an bonding layer is provided on the side of the edge pad 21 away from the cell 10, and the height of the bonding layer is h4, satisfying 60μm≤h4≤120μm.

[0093] In this embodiment, a bonding layer is provided on the side of the edge pad 21 away from the battery cell 10. The bonding layer connects the edge pad 21 to the connector 60, thereby improving the reliability of the electrical connection between the edge pad 21 and the connector 60. The bonding layer includes, but is not limited to, a tin layer, a silver layer, and a nickel layer.

[0094] In this embodiment, the thickness h4 of the bonding layer in the thickness direction of the photovoltaic module is set to be greater than or equal to 60 μm and less than or equal to 120 μm to ensure that the bonding layer is thick enough to conduct electricity between the edge pad 21 and the connector 60, thereby improving the reliability of the electrical connection between the edge pad 21 and the connector 60 and ensuring the photoelectric conversion efficiency of the photovoltaic module. Furthermore, reducing the contact resistance between the edge pad 21 and the connector 60 improves the conductivity of the edge pad 21 and the connector 60, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0095] Furthermore, the above-mentioned design can also prevent the bonding layer from being too thick, resulting in excessive material consumption and thus high manufacturing costs for photovoltaic modules, which would affect the competitiveness of photovoltaic modules.

[0096] For example, the thickness h4 of the bonding layer in the thickness direction of the photovoltaic module can be set to 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, etc.

[0097] In some embodiments, 50μm≤h1+h2-h3-h4≤300μm is satisfied.

[0098] In this embodiment, in the thickness direction of the photovoltaic module, the difference between the sum of the thickness h1 of the insulating block 50 and the thickness h2 of the adhesive dot 40, and the difference between the thickness h3 of the edge pad 21 and the thickness h4 of the bonding layer, is set to be greater than or equal to 50 μm and less than or equal to 300 μm. This is to prevent the adhesive dot 40 from overflowing onto the edge pad 21 in the second direction Y, which would affect the reliability of the electrical connection between the connector 60 and the edge pad 21, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0099] Furthermore, through the above settings, the thickness of the insulating block 50, the adhesive dot 40, the edge pad 21, and the bonding layer in the photovoltaic module can meet the process design requirements of the photovoltaic module, thereby improving the reliability of the photovoltaic module and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0100] For example, h1+h2-h3-h4=50μm; or h1+h2-h3-h4=100μm; or h1+h2-h3-h4=150μm; or h1+h2-h3-h4=200μm; or h1+h2-h3-h4=250μm; or h1+h2-h3-h4=300μm.

[0101] In a preferred embodiment, the following condition is met: 100μm≤h1+h2-h3-h4≤200μm.

[0102] As a preferred embodiment, in this application embodiment, in the thickness direction of the photovoltaic module, the difference between the sum of the thickness h1 of the insulating block 50 and the thickness h2 of the adhesive dot 40, and the difference between the thickness h3 of the edge pad 21 and the thickness h4 of the bonding layer, is set to be greater than or equal to 100 μm and less than or equal to 200 μm. This further prevents the adhesive dot 40 from overflowing onto the edge pad 21 in the second direction Y, affecting the reliability of the electrical connection between the connector 60 and the edge pad 21, thereby further improving the reliability of the electrical connection between the connector 60 and the edge pad 21, and further ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0103] Furthermore, through the above settings, the thickness of the insulating block 50, the adhesive dot 40, the edge pad 21, and the bonding layer in the photovoltaic module can further meet the process design requirements of the photovoltaic module, thereby further improving the reliability of the photovoltaic module and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0104] For example, h1+h2-h3-h4=100μm; or h1+h2-h3-h4=125μm; or h1+h2-h3-h4=150μm; or h1+h2-h3-h4=175μm; or h1+h2-h3-h4=200μm.

[0105] In some embodiments, along the first direction X, the size of the adhesive dot 40 is L3, satisfying 0.6mm≤L3≤3mm.

[0106] In this embodiment, the size L3 of the adhesive dot 40 in the first direction X is set to be greater than or equal to 0.6 mm and less than or equal to 3 mm. This makes the size L3 of the adhesive dot 40 in the first direction X more reasonable, allowing the adhesive dot 40 to bond the connector 60 to the surface of the solar cell 10, preventing the connector 60 from shifting and causing a partial short circuit in the photovoltaic module.

[0107] Furthermore, the above-mentioned configuration ensures that the size L3 of the adhesive dot 40 in the first direction X will not be too large. If the size L3 of the adhesive dot 40 in the first direction X is too large, the receiving groove formed by the two adjacent insulating blocks 50 and the back of the battery cell 10 located between the two adjacent insulating blocks 50 will be difficult to accommodate the adhesive dot 40. This will cause the adhesive dot 40 to easily overflow onto the edge pad 21 in the second direction Y, affecting the reliability of the electrical connection between the edge pad 21 and the connector 60, and thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0108] For example, the size L3 of the adhesive dot 40 in the first direction X can be set to 0.6mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc.

[0109] In some embodiments, along the thickness direction of the photovoltaic module, at the location of the adhesive dot 40, the height of the connector 60 is h5, satisfying 255μm≤h5≤355μm.

[0110] At the location of adhesive dot 40, the height h5 of connector 60 in the thickness direction of the photovoltaic module is set to be greater than or equal to 255μm and less than or equal to 355μm. It should be noted that the height h5 of connector 60 in the thickness direction of the photovoltaic module refers to the distance between the side of connector 60 away from the cell 10 and the back of the cell 10 in the thickness direction of the photovoltaic module.

[0111] In this embodiment, the connector 60 is fixed to the back of the solar cell 10 using adhesive dots 40. After the photovoltaic module is encapsulated, the connector 60 at the adhesive dots 40 is in a warped state. That is, the connector 60 has a certain height relative to the back of the solar cell 10. This height allows for the filling of a certain thickness of adhesive film beneath the connector 60. The adhesive film can alleviate the stress on the solar cell 10, reduce the contact area between the connector 60 and the solar cell 10, thereby improving the process yield of the photovoltaic module and reducing the risk of microcracks or fragmentation in the solar cell 10. Furthermore, this design can also reduce cracking caused by vibration during the transportation and installation of the photovoltaic module, improving the product quality of the photovoltaic module.

[0112] For example, at the location of the adhesive dot 40, the height h5 of the connector 60 in the thickness direction of the photovoltaic module can be set to 255μm, 275μm, 295μm, 300μm, 310μm, 320μm, 330μm, 340μm, 355μm, etc.

[0113] In a preferred embodiment, the following conditions are met: 270μm≤h5≤310μm.

[0114] In a preferred embodiment, at the location of the adhesive dot 40, the height h5 of the connector 60 in the thickness direction of the photovoltaic module can be set to be greater than or equal to 270 μm and less than or equal to 310 μm. This makes the height h5 of the connector 60 in the thickness direction of the photovoltaic module at the location of the adhesive dot 40 more reasonable, and the thickness of the adhesive film filling below the connector 60 and on the back of the cell 10 more reasonable. This helps to reduce the contact area between the connector 60 and the cell 10, improve the process yield of the photovoltaic module, and reduce the risk of microcracks and fragmentation of the cell 10. Furthermore, it further reduces cell cracking caused by vibration during the transportation and installation of the photovoltaic module, improving the product quality of the photovoltaic module.

[0115] Furthermore, the above settings can also control the amount of encapsulant material used, thereby controlling the manufacturing cost of photovoltaic modules and enhancing the product competitiveness of photovoltaic modules.

[0116] For example, at the location of the adhesive dot 40, the height h5 of the connector 60 in the thickness direction of the photovoltaic module can be set to 270μm, 280μm, 290μm, 300μm, 310μm, etc.

[0117] In some embodiments, along the thickness direction of the photovoltaic module, at the location of the edge pad 21, the height of the connector 60 is h6, satisfying 205μm≤h6≤305μm.

[0118] At the location of the edge pad 21, the height h6 of the connector 60 in the thickness direction of the photovoltaic module is set to be greater than or equal to 205μm and less than or equal to 305μm. It should be noted that the height of the connector 60 here refers to the distance between the side of the connector 60 away from the cell 10 and the back of the cell 10 in the thickness direction of the photovoltaic module.

[0119] In this embodiment, the connector 60 is fixed to the back of the solar cell 10 via edge pads 21 and adhesive dots 40. After the photovoltaic module is encapsulated, the connector 60 between the adhesive dots 60 and the edge pads 21 is in a warped state. The connector 60 between the adhesive dots 60 and the edge pads 21 forms a warping angle α with the plane where the solar cell 10 is located. By setting the height of the connector 60 at the positions of the edge pads 21 and the adhesive dots 40, the warping angle α of the connector 60 is made more reasonable, and the thickness of the adhesive film filling between the connector 60 and the back of the solar cell 10 is more reasonable. This helps to reduce the contact area between the connector 60 and the solar cell 10, improve the process yield of the photovoltaic module, and reduce the risk of microcracks and fragmentation of the solar cell 10. Furthermore, it also helps to reduce cracking caused by vibration during the transportation and installation of the photovoltaic module, improving the product quality of the photovoltaic module. In addition, the above settings can also control the amount of adhesive film used, thereby controlling the manufacturing cost of the photovoltaic module and improving the product competitiveness of the photovoltaic module.

[0120] For example, at the location of the edge pad 21, the height h6 of the connector 60 in the thickness direction of the photovoltaic module can be set to 205μm, 215μm, 225μm, 235μm, 245μm, 255μm, 265μm, 275μm, 285μm, 295μm, 305μm, etc.

[0121] In a preferred embodiment, the following conditions are met: 230μm≤h6≤270μm.

[0122] In a preferred embodiment of this application, the height h6 of the connector 60 in the thickness direction of the photovoltaic module can be set to be greater than or equal to 230μm and less than or equal to 270μm. This makes the thickness of the adhesive film between the connector 60 and the back of the solar cell 10 more reasonable, thereby controlling the cost of the photovoltaic module while ensuring its reliability, avoiding risks such as microcracks and fragmentation of the solar cell 10, and improving the process yield of the photovoltaic module.

[0123] For example, the height h6 of the connector 60 in the thickness direction of the photovoltaic module can be set to 230μm, 240μm, 250μm, 260μm, 270μm, etc.

[0124] In some embodiments, in the second direction Y, the length of the portion of the connector 60 located between the adhesive dot 40 and the side of the battery cell 10 is L4, satisfying 0mm≤L4≤1.0mm.

[0125] In this embodiment, to facilitate the fixing of the connector 60 by the adhesive dots 40 when the machine is positioned, the length L4 of the portion of the connector 60 located between the adhesive dots 40 and the corresponding side of the solar cell 10 in the second direction Y is set to be greater than or equal to 0 mm and less than or equal to 1.0 mm. It can be understood that having a length L4 greater than or equal to 0 mm ensures the fixing effect of the adhesive dots 40 on the connector 60 and prevents the connector 60 from shifting. Conversely, having a length L4 less than or equal to 1 mm prevents the connector 60 from extending too far in the second direction Y, potentially causing it to overlap with adjacent solar cells 10, with dissimilar connectors, or with dissimilar grid lines, leading to a partial short circuit in the photovoltaic module and affecting its photoelectric conversion efficiency. Furthermore, the above-mentioned configuration can reduce the extension length of the connector 60 in the second direction Y, reduce the material consumption of the connector 60, thereby reducing the manufacturing cost of the photovoltaic module and enhancing the product competitiveness of the photovoltaic module. In addition, the adhesive dots 40 will not be too close to the edge of the solar cell 10, to avoid local stress concentration in the solar cell 10, which could lead to defects such as microcracks or fragmentation.

[0126] For example, the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the battery sheet 10 in the second direction Y can be set to 0mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.0mm, etc.

[0127] In some embodiments, when L4 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm, the height of the end of the connector 60 along the thickness direction of the photovoltaic module is h7, satisfying 280 μm ≤ h7 ≤ 360 μm.

[0128] In the second direction Y, if the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the solar cell 10 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm, the height h7 of the end of the connector 60 in the photovoltaic module thickness direction is set to be greater than or equal to 280 μm and less than or equal to 360 μm. It should be noted that the height of the end of the connector 60 here refers to the distance between the side of the connector 60 away from the solar cell 10 and the back surface of the solar cell 10 in the photovoltaic module thickness direction.

[0129] In this embodiment, when the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the solar cell 10 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm, the height h7 of the end of the connector 60 in the thickness direction of the photovoltaic module is set to be greater than or equal to 280 μm and less than or equal to 360 μm. This makes the thickness of the adhesive film between the connector 60 and the back of the solar cell 10 more reasonable, thereby controlling the cost of the photovoltaic module while ensuring its reliability, avoiding risks such as microcracks and fragmentation of the solar cell 10, and improving the process yield of the photovoltaic module.

[0130] For example, when the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the cell 10 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm, the height h7 of the end of the connector 60 in the thickness direction of the photovoltaic module can be set to 280 μm, 290 μm, 300 μm, 310 μm, 320 μm, 330 μm, 340 μm, 350 μm, 360 μm, etc.

[0131] In some embodiments, when L4 is greater than or equal to 0.9 mm and less than or equal to 1.0 mm, the height of the end of the connector 60 along the thickness direction of the photovoltaic module is h7, satisfying 290 μm ≤ h7 ≤ 380 μm.

[0132] In the second direction Y, if the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the solar cell 10 is greater than or equal to 0.9 mm and less than or equal to 1.0 mm, the height h7 of the end of the connector 60 in the photovoltaic module thickness direction is set to be greater than or equal to 290 μm and less than or equal to 380 μm. It should be noted that the height of the end of the connector 60 here refers to the distance between the side of the connector 60 away from the solar cell 10 and the back surface of the solar cell 10 in the photovoltaic module thickness direction.

[0133] In this embodiment, when the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the solar cell 10 is greater than or equal to 0.9 mm and less than or equal to 1.0 mm, the height h7 of the end of the connector 60 in the thickness direction of the photovoltaic module is set to be greater than or equal to 290 μm and less than or equal to 380 μm. This makes the thickness of the adhesive film between the connector 60 and the back of the solar cell 10 more reasonable, thereby controlling the cost of the photovoltaic module while ensuring its reliability, avoiding risks such as microcracks and fragmentation of the solar cell 10, and improving the process yield of the photovoltaic module.

[0134] For example, when the length L4 of the portion of the connector 60 located between the adhesive dot 40 and the corresponding side of the cell 10 is greater than or equal to 0.9 mm and less than or equal to 1.0 mm, the height h7 of the end of the connector 60 in the thickness direction of the photovoltaic module can be set to 290 μm, 300 μm, 310 μm, 320 μm, 330 μm, 340 μm, 350 μm, 360 μm, 380 μm, etc.

[0135] In some embodiments, in the second direction Y, there is a first gap between two adjacent solar cells 10, and along the thickness direction of the photovoltaic module, the portion of the connector 60 opposite to the first gap has a recess.

[0136] In this embodiment of the application, in each battery string, two adjacent battery cells 10 are arranged at intervals in the second direction Y, and there is a first gap between the two adjacent battery cells 10. In the thickness direction of the photovoltaic module, the portion of the connector 60 opposite to the first gap has a recess. That is, the portion of the connector 60 opposite to the first gap is bent toward the direction closer to the first gap.

[0137] The design of this recess can reduce the height of the connector 60 in the thickness direction of the photovoltaic module between two close adhesive dots 40 in two adjacent solar cells 10, thereby reducing the thickness of the adhesive film between the connector 60 and the solar cell 10, thus reducing the amount of adhesive film used, reducing the manufacturing cost of the photovoltaic module, and improving the product competitiveness of the photovoltaic module.

[0138] In some embodiments, adhesive dots 40 are at least partially disposed between the back side of the battery cell 10 and the connector 60; and / or, the side of the connector 60 away from the battery cell 10 is at least partially exposed to the adhesive dots 40.

[0139] In this embodiment, the connector 60 is bonded to the back of the solar cell 10 using adhesive dots 40. It is understood that the adhesive dots 40 are at least partially located between the back of the solar cell 10 and the connector 60. Both the adhesive dots 40 and the insulating block 50 are organic materials, making them easier to adhere firmly, thus more securely bonding the connector 60 to the back of the solar cell 10. This improves the reliability of the connector 60's fixation to the back of the solar cell 10, preventing the connector 60 from shifting and coming into contact with other non-standard grid lines or connectors, which could lead to a partial short circuit in the photovoltaic module and affect its photoelectric conversion efficiency.

[0140] In this embodiment, in the thickness direction of the photovoltaic module, the side of the connector 60 away from the cell 10 is at least partially exposed to the adhesive dot 40, so as to avoid the adhesive dot 40 being too large and overflowing onto the edge pad 21, which would affect the reliability of the electrical connection between the connector 60 and the edge pad 21.

[0141] In some embodiments, in the second direction Y, the size of the adhesive dot 40 is L5, and there is a first distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10, satisfying 0.2≤L5 / L1≤0.8.

[0142] In this embodiment, the ratio of the dimension L5 of the adhesive dot 40 in the second direction Y to the distance L1 between the edge pad 21 and the corresponding edge of the cell 10 is set to be greater than or equal to 0.2 and less than or equal to 0.8. This ensures the effective collection of charge carriers in the edge region of the cell 10 by the edge pad 21, preventing the adhesive dot 40 from overflowing between the edge pad 21 and the connector 60, which would affect the reliability of the electrical connection between the edge pad 21 and the connector 60, and thus affect the photoelectric conversion efficiency of the photovoltaic module. Furthermore, it ensures that the adhesive dot 40 provides sufficient pull-out force to fix the connector 60 to the back of the cell 10, preventing the connector 60 from shifting and contacting and conducting with other non-standard grid lines or connectors, which could lead to a partial short circuit in the photovoltaic module and affect its photoelectric conversion efficiency.

[0143] For example, the ratio of the size L5 of the adhesive dot 40 in the second direction Y to the distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10 can be set to 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0144] In one embodiment, the size L5 of the adhesive dot 40 in the second direction Y can be set to 2 mm, and the distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10 can be set to 4 mm. Alternatively, the size L5 of the adhesive dot 40 in the second direction Y can be set to 3 mm, and the distance L1 between the edge pad 21 and the corresponding edge of the battery cell 10 can be set to 4 mm.

[0145] In some embodiments, in the first direction X, the size of the adhesive dot 40 is L3 and the length of the insulating block 50 is L6, satisfying 1≤L3 / L6≤15.

[0146] In this embodiment, the ratio of the size L3 of the adhesive dot 40 in the first direction X to the length L6 of the insulating block 50 in the first direction X is set to be greater than or equal to 1 and less than or equal to 15. This ensures the reliability of the connection between the connector 60 and the back of the cell 10 while controlling the cost of the photovoltaic module, thereby ensuring the reliability of the photovoltaic module.

[0147] It should be noted that the length of the insulating block 50 in the first direction X affects the spread of the adhesive dots 40 in the first direction X. A larger dimension L3 of the adhesive dots 40 in the first direction X can prevent the connector 60 from shifting off the adhesive dots 40, thus preventing the adhesive dots 40 from securing the connector 60 to the back of the solar cell 10. However, a larger length of the insulating block 50 in the first direction X leads to excessive material consumption of the insulating block 50, resulting in excessively high manufacturing costs for the photovoltaic module and hindering its competitiveness.

[0148] For example, the dimension L3 of the adhesive dot 40 in the first direction X can be set to be greater than or equal to 0.6 mm and less than or equal to 3 mm. For example, L3 = 0.6 mm; or, L3 = 1.0 mm; or, L3 = 2.0 mm; or, L3 = 3.0 mm, etc. The length L6 of the insulating block 50 in the first direction X can be set to be greater than or equal to 0.2 mm and less than or equal to 0.5 mm. For example, L6 = 0.2 mm; or, L6 = 0.3 mm; or, L6 = 0.4 mm; or, L7 = 0.5 mm, etc.

[0149] In some embodiments, the battery cell 10 includes a first battery cell, a first connector having a first projection on the plane of the first battery cell, an adhesive dot 40 having a second projection on the plane of the first battery cell, and the end of the first projection in the second direction Y falling into the second projection.

[0150] In this embodiment, the first projection of the first connector on the plane of the first solar cell is set to fall within the second projection of the adhesive dot 40 on the plane of the first solar cell. That is, the end of the first connector is inserted into the adhesive dot 40. Since the end of the first connector is cut and relatively sharp, it can easily pierce the insulating block 50, come into contact with other non-standard grid lines, and conduct electricity, leading to a partial short circuit in the photovoltaic module. If the end of the first connector is inserted into the adhesive dot 40, the adhesive dot 40 can cover the end of the first connector, preventing the end of the first connector from piercing the insulating block 50, thereby ensuring the reliability of the photovoltaic module.

[0151] It should be noted that the battery string in this embodiment includes a first battery cell and a second battery cell, which are arranged at intervals in the second direction Y, and a first gap exists between the first battery cell and the second battery cell. The first connector does not extend across the first battery cell to the second battery cell.

[0152] In some embodiments, the battery cell 10 further includes a second battery cell, which is arranged sequentially with the first battery cell in the second direction Y; one end of the second connector 62 is disposed on the back side of the first battery cell, and the other end extends along the second direction Y to the back side of the second battery cell; the distance between the adhesive dot 40 located between the second connector 62 and the first battery cell and the edge of the first battery cell near the second battery cell is L7, and the distance between the adhesive dot 40 located between the first connector 61 and the first battery cell and the edge of the first battery cell near the second battery cell is L8, satisfying L7 < L8.

[0153] The battery string in this embodiment includes a first battery cell and a second battery cell, which are spaced apart in a second direction Y, with a first gap between them. A first connector extends along the first direction Y and is disposed on the back side of the first battery cell, without extending across the first battery cell to the second battery cell. A second connector extends along the second direction Y, with one end disposed on the back side of the first battery cell and the other end crossing the first gap and disposed on the back side of the second battery cell, so that the first and second battery cells are connected in series via the second connector.

[0154] Specifically, the distance L7 between the adhesive dot 40 located between the second connector and the first solar cell and the edge of the first solar cell near the second solar cell is smaller than the distance L8 between the adhesive dot 40 located between the first connector and the first solar cell and the edge of the first solar cell near the second solar cell. In other words, the distance between the adhesive dot 40 between the second connector and the first solar cell and the corresponding side of the first solar cell is smaller, while the distance between the adhesive dot 40 between the first connector and the first solar cell and the corresponding side of the first solar cell is larger. This improves the reliability of the connection between the second connector and the area near the edge of the first solar cell, preventing the second connector from forming an automatic end between the first and second solar cells, which could contact and conduct with other non-standard grid lines or other non-standard connectors, leading to a partial short circuit in the photovoltaic module and affecting its photoelectric conversion efficiency.

[0155] Reference Figure 13 A flowchart of a photovoltaic module manufacturing method is disclosed.

[0156] This application discloses a method for preparing a photovoltaic module, the method comprising: 201, a battery cell 10 is provided, the back of the battery cell 10 is provided with a plurality of first current collector lines 11 extending along a first direction X and a plurality of second current collector lines 12 arranged alternately along a second direction Y, the second direction Y intersecting the first direction X; The photovoltaic module fabrication method disclosed in this application produces a back-contact photovoltaic module, which has advantages such as high photoelectric conversion efficiency and aesthetic appearance. The solar cell 10, as the core component of this photovoltaic module, converts solar energy into electrical energy. The solar cell 10 has a front and a back side arranged opposite to each other; the front side is the light-receiving surface facing the sunlight, and the back side is the light-receiving surface facing away from the sunlight.

[0157] On the plane containing the solar cell 10, the photovoltaic module has intersecting first direction X and second direction Y. Taking the solar cell 10 as a rectangular or near-rectangular solar cell as an example, the first direction X can be the length direction of the solar cell 10, and the second direction Y can be the width direction of the solar cell 10. Alternatively, the first direction X can be the width direction of the solar cell 10, and the second direction Y can be the length direction of the solar cell 10.

[0158] It should be noted that "rectangular-like solar cells" refers to rectangular solar cells with chamfered corners. These chamfers include, but are not limited to, rounded chamfers and square chamfers.

[0159] The back of the solar cell 10 is provided with multiple first collector grid lines 11 and multiple second collector grid lines 12 extending along a first direction X and arranged alternately along a second direction Y. The first collector grid lines 11 and the second collector grid lines 12 have opposite conductivity types. This allows the collection of charge carriers generated by the solar cell 10 through the multiple first collector grid lines 11 and the second collector grid lines 12.

[0160] For example, in this embodiment of the application, the first current collector line 11 and the second current collector line 12 can be formed on the back side of the battery cell 10 by screen printing. Of course, in this embodiment of the application, there is no limitation on the specific formation method of the first current collector line 11 and the second current collector line 12. In practical applications, those skilled in the art can choose according to their needs.

[0161] 202. Multiple sets of insulating blocks 50 are provided on the back of the battery cell 10. The multiple sets of insulating blocks 50 are arranged at intervals along the first direction X. For two adjacent sets of insulating blocks 50, one set covers the side of the first current collector line 11 away from the battery cell 10, and the other set covers the side of the second current collector line 12 away from the battery cell 10. In this embodiment, multiple sets of insulating blocks 50 are disposed on the back side of the solar cell 10. The multiple sets of insulating blocks 50 are arranged at intervals along a first direction X, and each set of insulating blocks 50 includes multiple insulating blocks 50 arranged at intervals along a second direction Y. In a set of insulating blocks 50, each insulating block 50 is disposed on the side of a first current collector line 11 away from the solar cell 10, so as to insulate and block the first current collector line 11 and the second connector 62 through each insulating block 50, so as to prevent the second connector 62 and the first current collector line 11 from contacting and conducting, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0162] In the adjacent set of insulating blocks 50, each insulating block 50 is disposed on the side of a second collector grid line 12 away from the solar cell 10, so as to insulate and block the second collector grid line 12 and the first connector 61 through each insulating block 50, so as to prevent the first connector 61 and the second collector grid line 12 from contacting and conducting, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0163] For example, in this embodiment of the application, multiple sets of insulating blocks 50 can be formed on the back side of the battery cell 10 by screen printing, and the multiple sets of insulating blocks 50 are arranged at intervals in the first direction X. Of course, the above are only individual examples of the specific formation method of the insulating blocks 50 and are not intended to limit the application.

[0164] 203, Adhesive dots 40 are provided on the back of the battery cell 10, and the adhesive dots 40 are located in the edge region of the battery cell 10 in the second direction Y. In this embodiment, adhesive dots 40 are provided on the back of the solar cell 10. The adhesive dots 40 are located in the edge area of ​​the solar cell 10 in the second direction Y, so as to bond the connector 60 to the back of the solar cell 10 through the adhesive dots 40, fix the connector 60, and prevent the connector 60 from shifting, contacting and conducting with other non-standard grid lines or connectors, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0165] It should be noted that in this embodiment, the adhesive dot 40 covers at least a portion of an insulating block 50 and a portion of the first current collector line 11 and / or the second current collector line 12 adjacent to the insulating block 50 along the second direction Y. This forms a receiving groove enclosed by the insulating block 50, the adjacent first current collector line 11 and / or the second current collector line 12, and the back surface of the solar cell 10. This receiving groove can accommodate the adhesive dot 40, increasing the difficulty of the adhesive dot 40 overflowing in the second direction Y, thereby preventing the adhesive dot 40 from overflowing onto the edge pad 21, improving the reliability of the electrical connection between the edge pad 21 and the connector 60, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0166] Furthermore, the insulating block 50 and the first current collector line 11 and / or the second current collector line 12 adjacent to the insulating block 50 in the second direction Y can also support the connector 60, reducing or avoiding direct contact between the connector 60 and the back of the cell 10, thereby improving the process yield of the photovoltaic module and avoiding defects such as microcracks and fragments in the cell 10.

[0167] 204. A connector 60 extending in the second direction Y is provided on the back side of the battery cell 10. The connector 60 is provided on the side of the adhesive dot 40 away from the battery cell 10 so as to fix the connector 60 to the surface of the battery cell 10 by means of the adhesive dot 40.

[0168] The connector 60 in this embodiment is conductive. The connector 60 includes, but is not limited to, solder strips, metal wires, etc. In this embodiment, no particular restrictions are placed on the specific type of connector 60. In practical applications, those skilled in the art can select according to their needs.

[0169] In this embodiment of the application, there are multiple connectors 60, each extending along the second direction Y and spaced apart along the first direction X on the back of the battery cell 10, so as to connect multiple battery cells 10 in series through the multiple connectors 60 to form a battery string.

[0170] It should be noted that in this embodiment of the application, the connector 60 connects at least two adjacent battery cells 10 in series. The connector 60 includes a first connector 61 and a second connector 62. The first connector 61 is electrically connected to the first current collector line 11 and is insulated from the second current collector line 12 through an insulating block 50. The second connector 62 is electrically connected to the second current collector line 21 and is insulated from the first current collector line 11 through an insulating block 50.

[0171] It is understood that the first connector 61 is electrically connected to multiple first collector grid lines 11 to collect the charge carriers gathered by the multiple first collector grid lines 11 and transmit the collected charge carriers to the external circuit. An insulating block 50 is provided at the intersection area of ​​the first connector 61 and each extension line of the second collector grid line 12 to insulate the first connector 61 and the corresponding second collector grid line 12, preventing the first connector 61 and the second collector grid line 12 from conducting, which could lead to a partial short circuit in the photovoltaic module and affect the photovoltaic conversion efficiency of the photovoltaic module.

[0172] The second connector 62 is electrically connected to multiple second collector grid lines 12 to collect the charge carriers gathered by the multiple second collector grid lines 12 and transmit the collected charge carriers to the external circuit. An insulating block 50 is provided at the intersection of the second connector 62 and each extension line of the first collector grid line 11 to insulate the second connector 62 and the corresponding first collector grid line 11, preventing the second connector 62 and the first collector grid line 11 from conducting and causing a partial short circuit in the photovoltaic module, thus affecting the photoelectric conversion efficiency of the photovoltaic module.

[0173] In some embodiments, before providing a connector 60 extending in the second direction Y on the back side of the battery cell 10, the method further includes: A pad 20 is provided on the back of the battery cell 10. The pad 20 includes multiple pads, which are arranged sequentially on the back of the battery cell 10 along the second direction Y. The pad 20 is electrically connected to one of the first current collector line 11 and the second current collector line 12, and is insulated from the other of the first current collector line 11 and the second current collector line 12. The pad 20 includes an edge pad 21 located on the outermost side of the battery cell 10 in the second direction Y. Adhesive dots 40 are disposed between the edge pad 21 and the edge of the battery cell 10.

[0174] For example, the back of the solar cell 10 is provided with a plurality of pads 20 arranged sequentially along the second direction Y. In the thickness direction of the photovoltaic module, one side of each pad 20 is electrically connected to a first collector grid line 11, and the other side is electrically connected to a first connector 61. Thus, the first connector 61 is connected to the corresponding first collector grid line 11 through the pads 20, so as to collect the charge carriers collected by the first collector grid line 11. The pads 20 are insulated from the second collector grid line 12 to prevent the second collector grid line 12 from being connected to the first connector 61, which could cause a partial short circuit in the photovoltaic module.

[0175] For example, the back of the solar cell 10 is provided with multiple pads 20 arranged sequentially along the second direction Y. In the thickness direction of the photovoltaic module, one side of each pad 20 is electrically connected to a second current collector line 12, and the other side is electrically connected to a second connector 62. Thus, the second connector 62 is made conductive with the corresponding second current collector line 12 through the pads 20, so as to collect the charge carriers collected by the second current collector line 12. The pads 20 are insulated from the first current collector line 11 to prevent the first current collector line 11 from being conductive with the second connector 62, which could cause a partial short circuit in the photovoltaic module.

[0176] It should be noted that, in the second direction Y, the outermost pad 20 of the solar cell 10 is the edge pad 21. That is, the edge pad 21 is the pad 20 closest to the edge of the solar cell 10 in the second direction Y. A connecting line 30 is provided in the area of ​​the edge pad 21 near the edge of the solar cell 10, and the connecting line 30 is electrically connected to the edge pad 21. Furthermore, the connecting line 30 is conductive to one of the first collector grid line 11 and the second collector grid line 12, and insulated from the other of the first collector grid line 11 and the second collector grid line 12, so as to collect the charge carriers generated by the first collector grid line 11 or the second collector grid line 12 in the edge region of the solar cell 10 through the connecting line 30, and transmit the collected charge carriers to the first connector 61 or the second connector 62 through the edge pad 21.

[0177] In this embodiment, adhesive dots 40 are disposed in the second direction Y between the edge pad 21 and the edge of the solar cell 10. Since the charge carriers in the edge region of the solar cell 10 can be collected through the connecting lines 30, the placement of adhesive dots 40 does not affect the width of the gap between the first collector grid line 11 and the second collector grid line 12 in the second direction Y. In other words, the placement of adhesive dots 40 does not affect the collection efficiency of the first collector grid line 11 and the second collector grid line 12 for the charge carriers in the edge region of the solar cell 10, thereby helping to ensure the photoelectric conversion efficiency of the solar cell.

[0178] In some embodiments, at least one insulating block 50 is provided between the edge pad 21 and the adhesive dot 40.

[0179] In this embodiment of the application, at least one insulating block 50 is disposed between the edge pad 21 and the adhesive dot 40 in the second direction Y. Exemplarily, two insulating blocks 50 are disposed between the edge pad 21 and the adhesive dot 40 in the second direction Y. The two insulating blocks 50 and the back side of the solar cell 10 located between the two insulating blocks 50 form a receiving groove. This receiving groove can accommodate the adhesive dot 40, increasing the difficulty of the adhesive dot 40 overflowing in the second direction Y, thereby preventing the adhesive dot 40 from overflowing onto the edge pad 21, thus improving the reliability of the electrical connection between the edge pad 21 and the connector 60, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0180] It should be noted that, in the second direction Y, one, two, three, or four insulating blocks 50 can be set between the edge pad 21 and the adhesive dot 40. Here, no specific restrictions are placed on the number of insulating blocks 50 between the edge pad 21 and the adhesive dot 40; in practical applications, technicians can set the number of insulating blocks 50 as needed.

[0181] The photovoltaic module manufacturing method disclosed in this application embodiment further includes: pressing the connector 60 with a pin to fix the connector 60 to the surface of the cell 10 with adhesive dots 40.

[0182] In the photovoltaic module manufacturing method disclosed in this application, the connector 60 is pressed towards the solar cell 10 by a pin, so that the adhesive dots 40 can fix the connector 60 to the surface of the solar cell 10, thereby improving the reliability of the connection between the connector 60 and the solar cell 10 and preventing the connector 60 from shifting and coming into contact with other non-standard grid lines or non-standard connectors, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0183] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0184] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0185] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0186] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A photovoltaic module, characterized in that, include: The battery string includes multiple battery strings arranged sequentially along a first direction (X). Each battery string includes multiple battery cells (10) arranged sequentially along a second direction (Y). Each battery cell (10) has multiple first collector grid lines (11) extending along the first direction (X) and multiple second collector grid lines (12) arranged alternately along the second direction (Y) on its back side. The second direction (Y) intersects the first direction (X). A connector (60) extends along the second direction (Y) and is spaced along the first direction (X) on the back side of the battery cell (10). The connector (60) is configured to connect multiple battery cells (10) in series. The connector (60) includes a first connector (61) and a second connector (62). The first connector (61) is electrically connected to the first collector grid line (11) and insulated from the second collector grid line (12). The second connector (62) is electrically connected to the second collector grid line (12) and insulated from the first collector grid line (11). Insulating blocks (50) are provided in the intersection areas of the extension line of the first collector grid line (11) and the second connector (62) and the intersection areas of the extension line of the second collector grid line (12) and the first connector (61). Adhesive dots (40) are disposed on the back side of the battery cell (10) and located in the edge region of the battery cell (10) in the second direction (Y). The adhesive dots (40) are used to fix the connector (60) to the back side of the battery cell (10). The adhesive dots (40) cover at least a portion of one of the insulating blocks (50) and a portion of the first current collector line (11) and / or the second current collector line (12) adjacent to the insulating block (50) in the second direction (Y).

2. The photovoltaic module according to claim 1, characterized in that, Also includes: The pads (20) include a plurality of pads (20), which are arranged sequentially on the back side of the cell (10) along the second direction (Y). The pads (20) are electrically connected to one of the first current collector line (11) and the second current collector line (12) and are insulated from the other of the first current collector line (11) and the second current collector line (12). The pads (20) include edge pads (21) located on the outermost side of the cell (10) in the second direction (Y). The adhesive dots (40) are disposed between the edge pads (21) and the edge of the battery cell (10).

3. The photovoltaic module according to claim 1, characterized in that... In the second direction (Y), the center of the adhesive dot (40) is located between two adjacent insulating blocks (50).

4. The photovoltaic module according to claim 1, characterized in that, In the second direction (Y), the center of the adhesive dot (40) is located between two adjacent first collector grid lines (11) and / or second collector grid lines (12).

5. The photovoltaic module according to claim 1, characterized in that, In the first direction (X), the size of the adhesive dot (40) is larger than the size of the insulating block (50).

6. The photovoltaic module according to claim 2, characterized in that, In the second direction (Y), there is a first distance L1 between the edge pad (21) and the corresponding edge of the battery cell (10), satisfying L1≥2mm.

7. The photovoltaic module according to claim 6, characterized in that, In the second direction (Y), the distance between the edge of the adhesive dot (40) near the edge pad (21) and the edge of the edge pad (21) near the adhesive dot (40) is greater than or equal to 0 mm; And / or, in the second direction (Y), the distance between the center of the adhesive dot (40) and the side of the edge pad (21) near the adhesive dot (40) is L2, satisfying 0.6mm≤L2≤7.0mm.

8. The photovoltaic module according to claim 7, characterized in that, It satisfies 1.2mm≤L2≤4.5mm.

9. The photovoltaic module according to claim 2, characterized in that, Along the thickness direction of the photovoltaic module, the thickness of the insulating block (50) is h1, which satisfies 20μm≤h1≤60μm; And / or, the thickness of the adhesive dot (40) is h2, satisfying 90μm≤h2≤350μm.

10. The photovoltaic module according to claim 9, characterized in that, Along the thickness direction of the photovoltaic module, the thickness of the edge pad (21) is h3, which satisfies 1μm≤h3≤8μm.

11. The photovoltaic module according to claim 10, characterized in that, Along the thickness direction of the photovoltaic module, a bonding layer is provided on the side of the edge pad (21) away from the cell (10), and the thickness of the bonding layer is h4, which satisfies 60μm≤h4≤120μm.

12. The photovoltaic module according to claim 11, characterized in that, It satisfies 50μm≤h1+h2-h3-h4≤300μm.

13. The photovoltaic module according to claim 12, characterized in that, It satisfies 100μm≤h1+h2-h3-h4≤200μm.

14. The photovoltaic module according to claim 1, characterized in that, Along the first direction (X), the size of the adhesive dot (40) is L3, which satisfies 0.6mm≤L3≤3mm.

15. The photovoltaic module according to claim 14, characterized in that, Along the thickness direction of the photovoltaic module, at the location of the adhesive dot (40), the height of the connector (60) is h5, which satisfies 255μm≤h5≤355μm.

16. The photovoltaic module according to claim 15, characterized in that, It satisfies 270μm≤h5≤310μm.

17. The photovoltaic module according to claim 13, characterized in that, Along the thickness direction of the photovoltaic module, at the location of the edge pad (21), the height of the connector (60) is h6, which satisfies 205μm≤h6≤305μm.

18. The photovoltaic module according to claim 17, characterized in that, It satisfies 230μm≤h6≤270μm.

19. The photovoltaic module according to claim 1, characterized in that, In the second direction (Y), the length of the portion of the connector (60) located between the adhesive dot (40) and the side of the battery cell (10) is L4, which satisfies 0mm≤L4≤1.0mm.

20. The photovoltaic module according to claim 19, characterized in that, When L4 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm, the height of the end of the connector (60) along the thickness direction of the photovoltaic module is h7, which satisfies 280 μm ≤ h7 ≤ 360 μm.

21. The photovoltaic module according to claim 19, characterized in that, When L4 is greater than or equal to 0.9 mm and less than or equal to 1.0 mm, the height of the end of the connector (60) along the thickness direction of the photovoltaic module is h7, which satisfies 290 μm ≤ h7 ≤ 380 μm.

22. The photovoltaic module according to claim 1, characterized in that, In the second direction (Y), there is a first gap between two adjacent battery cells (10). Along the thickness direction of the photovoltaic module, the portion of the connector (60) opposite to the first gap has a recess.

23. The photovoltaic module according to claim 1, characterized in that, The adhesive dots (40) are at least partially disposed between the back of the battery cell (10) and the connector (60); And / or, at least part of the side of the connector (60) away from the battery cell (10) is exposed outside the adhesive dot (40).

24. The photovoltaic module according to claim 2, characterized in that, In the second direction (Y), the size of the adhesive dot (40) is L5, and there is a first distance L1 between the edge pad (21) and the corresponding edge of the battery cell (10), satisfying 0.2≤L5 / L1≤0.

8.

25. The photovoltaic module according to claim 2, characterized in that, In the first direction (X), the size of the adhesive dot (40) is L3, and the length of the insulating block (50) is L6, satisfying 1≤L3 / L6≤15.

26. The photovoltaic module according to claim 1, characterized in that, The battery cell (10) includes a first battery cell, The first connector has a first projection on the plane where the first battery cell is located, and the adhesive dot (40) has a second projection on the plane where the first battery cell is located. The end of the first projection in the second direction (Y) is inserted into the second projection.

27. The photovoltaic module according to claim 26, characterized in that, The battery cell (10) further includes a second battery cell, which is arranged sequentially with the first battery cell in the second direction (Y); One end of the second connector (62) is disposed on the back side of the first battery cell, and the other end extends along the second direction (Y) to the back side of the second battery cell; The distance between the adhesive dot (40) located between the second connector (62) and the first battery cell and the edge of the first battery cell near the second battery cell is L7, and the distance between the adhesive dot (40) located between the first connector (61) and the first battery cell and the edge of the first battery cell near the second battery cell is L8, satisfying L7 < L8.

28. A method for preparing a photovoltaic module, characterized in that, The method includes: A battery cell (10) is provided, wherein the back side of the battery cell (10) is provided with a plurality of first collector grid lines (11) extending along a first direction (X) and a plurality of second collector grid lines (12) arranged alternately along a second direction (Y), wherein the second direction (Y) intersects the first direction (X). Multiple sets of insulating blocks (50) are provided on the back of the battery cell (10). The multiple sets of insulating blocks (50) are arranged at intervals along the first direction (X). For two adjacent sets of insulating blocks (50), one set covers the side of the first current collector line (11) away from the battery cell (10), and the other set covers the side of the second current collector line (12) away from the battery cell (10). Adhesive dots (40) are provided on the back of the battery cell (10), and the adhesive dots (40) are located in the edge region of the battery cell (10) in the second direction (Y); A connector (60) extending in the second direction (Y) is provided on the back side of the battery cell (10). The connector (60) is provided on the side of the adhesive dot (40) away from the battery cell (10) so as to fix the connector (60) to the surface of the battery cell (10) through the adhesive dot (40). The connector (60) is connected in series with at least two adjacent battery cells (10). The connector (60) includes a first connector (61) and a second connector (62). The first connector (61) is electrically connected to the first collector grid line (11) and is insulated from the second collector grid line (12) through the insulating block (50). The second connector (62) is electrically connected to the second collector grid line (21) and is insulated from the first collector grid line (11) through the insulating block (50). The adhesive dot (40) covers at least a portion of one of the insulating blocks (50) and a portion of the first collector grid line (11) and / or the second collector grid line (12) adjacent to the insulating block (50) along the second direction (Y).

29. The method for preparing a photovoltaic module according to claim 28, characterized in that, Before providing a connector (60) extending in the second direction (Y) on the back side of the battery cell (10), the method further includes: A pad (20) is provided on the back side of the battery cell (10). The pad (20) includes a plurality of pads, which are arranged sequentially on the back side of the battery cell (10) along the second direction (Y). The pad (20) is electrically connected to one of the first current collector line (11) and the second current collector line (12) and is insulated from the other of the first current collector line (11) and the second current collector line (12). The pad (20) includes an edge pad (21) located on the outermost side of the battery cell (10) in the second direction (Y). The adhesive dots (40) are disposed between the edge pads (21) and the edge of the battery cell (10).

30. The method for preparing a photovoltaic module according to claim 29, characterized in that, At least one insulating block (50) is provided between the edge pad (21) and the adhesive dot (40).

31. The method for preparing a photovoltaic module according to claim 28, characterized in that, The method further includes: By pressing the connector (60) with a pin, the adhesive dots (40) fix the connector (60) to the surface of the battery cell (10).

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