Film Insertion Method of Photovoltaic Module and Photovoltaic Module

Abstract

The embodiment of the present application relates to a film inserting method for a photovoltaic module and a photovoltaic module. The film inserting method for the photovoltaic module includes: providing a battery string, where the battery string includes N cell pieces arranged in sequence along the same direction. Among them, each of the N cell pieces has a stacking welding area. The end of the nth cell piece in the battery string is stacked on the end of the (n - 1)th cell piece to form a stacking welding area, where 2 ≤ n ≤ N; opening the end of a cell piece in the battery string and the end of an adjacent cell piece to form a film inserting opening between the end of a cell piece and the end of an adjacent cell piece; providing a film strip, inserting a part of the film strip into the film inserting opening, and leaving the remaining part of the film strip exposed on the cell piece outside the film inserting opening; moving the battery string relative to the film strip so that at least part of the film strip exposed outside the film inserting opening is inserted into the film inserting opening; closing the film inserting opening so that the film strip is inserted between two cell pieces corresponding to the stacking welding area.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of solar cells, and particularly to an interlayer film inserting method for a photovoltaic module and a photovoltaic module. Background Art

[0002] A photovoltaic module, also called a solar panel, generates electricity through the "photovoltaic effect". As a new type of assembly method, the overlapping soldering technology realizes high energy density and increases the module power by performing micro-spacing "overlapping" soldering on adjacent solar cells, greatly shortening the distance between solar cells in the traditional soldering process.

[0003] During the lamination process of a photovoltaic module, in order to reduce the extrusion stress between adjacent solar cells in the overlapping soldering, a film strip needs to be inserted into the overlapping soldering area between adjacent solar cells. The film strip is located between adjacent solar cells in the overlapping soldering area and can provide a buffering effect for the solar cells during the lamination process of the photovoltaic module, improving the problem that solar cells are prone to hidden cracks.

[0004] However, during the process of inserting the film strip between adjacent solar cells corresponding to the overlapping soldering area currently, the problem of hidden cracks is also likely to occur. Summary of the Invention

[0005] Embodiments of the present application provide an interlayer film inserting method for a photovoltaic module and a photovoltaic module, which are at least beneficial to improving the problem that solar cells are prone to hidden cracks during the process of inserting an interlayer film into the photovoltaic module.

[0006] Embodiments of the present application provide an interlayer film inserting method for a photovoltaic module, including: providing a battery string, where the battery string includes N solar cells arranged in sequence along the same direction, and each of the N solar cells has an overlapping soldering area. An end of one solar cell is stacked on an end of an adjacent another solar cell to form the overlapping soldering area, and N is greater than 1; opening an end of one solar cell in the battery string and an end of an adjacent another solar cell to form an interlayer film inserting opening between the ends of the adjacent two solar cells; providing a film strip, inserting a part of the film strip into the interlayer film inserting opening, and leaving the remaining part of the film strip exposed on the solar cell outside the interlayer film inserting opening; moving the battery string relative to the film strip so that at least part of the film strip exposed outside the interlayer film inserting opening is inserted into the interlayer film inserting opening; and closing the interlayer film inserting opening so that the film strip is inserted between the two solar cells corresponding to the overlapping soldering area.

[0007] In addition, providing a battery string includes: forming a plurality of battery strings arranged at intervals along a preset direction, and spreading an end of one cell of each of the plurality of battery strings and an end of another adjacent cell to form the film insertion opening; providing a film strip includes: providing a plurality of film strips, each of the plurality of film strips being inserted into different film insertion openings of each of the plurality of battery strings, each of the film strips extending along the preset direction, and one film strip being inserted into one film insertion opening of each of the plurality of battery strings; each of the film strips corresponds to one of the stacking and soldering areas in each of the plurality of battery strings.

[0008] In addition, the plurality of battery strings include a first sub-battery string and a second sub-battery string alternately arranged along the preset direction. In each of the first sub-battery strings, the first cell to the Nth cell are arranged in sequence along a first direction. In each of the second sub-battery strings, the first cell to the Nth cell are arranged in sequence along a second direction, and the first direction is opposite to the second direction; inserting one film strip into one film insertion opening of each of the plurality of battery strings includes: before the step of forming the film insertion opening, shifting each of the second sub-battery strings along the second direction relative to each of the first sub-battery strings; providing a plurality of film strips, each of the plurality of film strips including: a first part corresponding to each of the first sub-battery strings, and a second part corresponding to each of the second sub-battery strings, the first part including: a first section and a second section arranged along the first direction, the second part including: a third section and a fourth section arranged along the first direction; inserting each of the second sections into one of the film insertion openings of the corresponding first sub-battery string, and each of the first sections being exposed on the cell of the corresponding first sub-battery string outside the film insertion opening; inserting each of the third sections into one of the film insertion openings of the corresponding second sub-battery string, and each of the fourth sections being exposed on the cell of the corresponding second sub-battery string outside the film insertion opening; moving each of the first sub-battery strings along the second direction relative to each of the film strips so that at least a part of each of the first sections is inserted into the film insertion opening, and moving each of the second sub-battery strings along the first direction so that at least a part of each of the fourth sections is inserted into the film insertion opening, and each of the first sub-battery strings and each of the second sub-battery strings are aligned and arranged in the preset direction.

[0009] In addition, the offset amount of each of the second sub-battery strings along the second direction relative to each of the first sub-battery strings is a first offset amount, the moving amount of moving each of the first sub-battery strings along the second direction relative to each of the film strips is a first displacement amount, the moving amount of moving each of the second sub-battery strings along the first direction relative to each of the film strips is a second displacement amount, and the sum of the first displacement amount and the second displacement amount is equal to the first offset amount.

[0010] In addition, the first displacement amount is equal to the second displacement amount.

[0011] In addition, moving each of the first sub-battery strings along the second direction with respect to each of the film strips, and moving each of the second sub-battery strings along the first direction with respect to each of the film strips includes: fixing each of the film strips, moving each cell of the first sub-battery string in the second direction by the first displacement amount, and moving each cell of the second sub-battery string in the first direction by the second displacement amount.

[0012] In addition, the method of forming each of the second sub-battery strings to be offset along the second direction with respect to each of the first sub-battery strings includes: forming the first sub-battery strings and the second sub-battery strings alternately arranged along the preset direction, with the first sub-battery strings and the second sub-battery strings aligned in the preset direction; moving the second sub-battery strings along the second direction with respect to each of the first sub-battery strings, so that each of the second sub-battery strings is offset by the first offset amount along the second direction with respect to each of the first sub-battery strings; or moving the first sub-battery strings along the first direction with respect to each of the second sub-battery strings, so that each of the second sub-battery strings is offset by the first offset amount along the second direction with respect to each of the first sub-battery strings; or moving the second sub-battery strings along the second direction with respect to each of the first sub-battery strings by a first sub-offset amount, and moving the first sub-battery strings along the first direction with respect to each of the second sub-battery strings by a second sub-offset amount, where the sum of the first sub-offset amount and the second sub-offset amount is equal to the first offset amount.

[0013] In addition, among multiple battery strings, the first battery cell to the Nth battery cell in two adjacent battery strings are arranged in sequence along the first direction, and the two adjacent battery strings are aligned in the preset direction. Inserting each of the multiple film strips into an insertion film opening of each of the multiple battery strings includes: providing multiple film strips, each of the multiple film strips including a third part and a fourth part arranged along the first direction, with the third part and the fourth part both extending along the preset direction; inserting the fourth part of one of the film strips into an insertion film opening of each of the multiple battery strings, with the third part exposed on the battery cells outside the insertion film opening; moving each of the battery strings in the second direction with respect to each of the film strips, so that at least a part of the fourth part of the film strip is inserted into the insertion film opening.

[0014] In addition, inserting the film strip with at least a part thereof exposed outside the film insertion opening into the film insertion opening includes: inserting the entire film strip into the film insertion opening; or inserting the film strip with a part thereof exposed outside the film insertion opening into the film insertion opening.

[0015] In addition, after the step of moving the battery string relative to the film strip, the orthographic projection of the film strip on the battery cell coincides with the overlapping soldering area.

[0016] In addition, the step of inserting each of the multiple film strips into one film insertion opening of each of the multiple battery strings includes: placing each film strip above each battery string, the film strip extending along the preset direction, and each film strip being opposite to one film insertion opening in each battery string; stretching both ends of each film strip along the preset direction in a direction away from each other, and lowering each film strip to insert each film strip into the corresponding film insertion opening; moving the ends of one battery cell in each battery string and the ends of adjacent battery cells in a direction close to each other to close the film insertion opening, and each film strip inserted into the film insertion opening is located between two battery cells corresponding to the overlapping soldering area.

[0017] In addition, during the step of moving each battery string relative to each film strip, keep the film insertion opening open.

[0018] In addition, the opening angle of the film insertion opening is 15° to 30°.

[0019] In addition, in the step of partially inserting the film strip into the film insertion opening, the ratio of the width of the film strip inserted into the film insertion opening to the width of the film strip on the battery cell exposed outside the film insertion opening is 1:5 to 5:1.

[0020] Correspondingly, an embodiment of the present application further provides a photovoltaic module, including: a battery string including N battery cells arranged in sequence along the same direction, where each of the N battery cells has an overlapping soldering area, and the end of one battery cell is stacked on the end of an adjacent another battery cell to form the overlapping soldering area, and N is greater than 1; multiple film strips formed between two battery cells corresponding to different overlapping soldering areas of the battery string by the film insertion method of the photovoltaic module as described in any one of the above; a packaging layer for covering the surface of the battery string; and a cover plate for covering the surface of the packaging layer away from the battery string.

[0021] The technical solution provided by the embodiment of the present application has at least the following advantages:

[0022] In the technical solution of the film inserting method of the photovoltaic module provided by the embodiment of the present application, a part of the film strip is inserted into the film inserting opening. Compared with the case where the entire film strip is inserted into the film inserting opening, the opening of the film inserting opening can be smaller. In this way, in the actual step of opening the ends of adjacent solar cells, the degree of opening between the ends of adjacent solar cells is smaller, which is beneficial to reducing the risk of causing hidden cracks in the solar cells during the process of opening the solar cells. After inserting the film, by moving the battery string relative to the film strip, the exposed film strip can be inserted into the stacking welding area, increasing the width of the film strip inserted into the stacking welding area and improving the buffering ability of the film strip to the stacking welding area. At the same time, by adopting the method of moving the battery string, the remaining part of the film strip can be inserted into the film inserting opening without further increasing the opening between the solar cells in the stacking welding area, and no further problem of hidden cracks will be caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0024] Figure 1 It is a schematic cross-sectional structure diagram of a battery string provided in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0025] Figure 2 It is a schematic top view structure diagram of a battery string provided in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0026] Figure 3 It is a schematic cross-sectional structure diagram corresponding to the step of forming a film inserting opening in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0027] Figure 4 It is a schematic cross-sectional structure diagram corresponding to the step of partially inserting a film strip into a film inserting opening in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0028] Figure 5 It is a schematic top view structure diagram corresponding to the step of partially inserting a film strip into a film inserting opening in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0029] Figure 6 It is a schematic cross-sectional structure diagram corresponding to the step of moving a battery string relative to a film strip in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0030] Figure 7 It is a schematic top view structure diagram corresponding to the step of moving a battery string relative to a film strip in a film inserting method of a photovoltaic module according to an embodiment of the present application;

[0031] Figure 8 A top view structural schematic diagram corresponding to the step of providing a battery string in another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0032] Figure 9 A top view structural schematic diagram corresponding to the step of partially inserting a film strip into a film inserting opening in another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0033] Figure 10 A top view structural schematic diagram corresponding to the step of moving a battery string relative to a film strip in another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0034] Figure 11 A top view structural schematic diagram corresponding to the step of moving a battery string relative to a film strip in another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0035] Figure 12 A top view structural schematic diagram corresponding to the step of providing a battery string in yet another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0036] Figure 13 A top view structural schematic diagram corresponding to the step of partially inserting a film strip into a film inserting opening in yet another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0037] Figure 14 A top view structural schematic diagram corresponding to the step of moving a battery string relative to a film strip in yet another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0038] Figure 15 A top view structural schematic diagram corresponding to the step of moving a battery string relative to a film strip in yet another film inserting method for a photovoltaic module provided in an embodiment of the present application;

[0039] Figure 16 A cross-sectional structural schematic diagram of a photovoltaic module provided in another embodiment of the present application. Detailed implementation manners

[0040] As can be seen from the background art, in the current step of inserting a film into a photovoltaic module, the problem of hidden cracks is likely to occur.

[0041] Analysis reveals that in the step of inserting the film into the photovoltaic module, one of the reasons for the prone occurrence of hidden cracks is that before inserting the film, it is first necessary to open the end corresponding to the overlapping welding area of adjacent solar cells to form an insertion opening. In this step, usually one end of the solar cell needs to be lifted. If the insertion opening is relatively large, the end of the solar cell needs to be lifted higher, which may cause uneven stress between the non-lifted end and the lifted end of the solar cell, thereby leading to the problem of hidden cracks.

[0042] The embodiment of the present application provides a film insertion method for a photovoltaic module. The film strip is partially inserted into the insertion opening. Compared with the case where the film strip is completely inserted into the insertion opening, the insertion opening can be smaller. In this way, in the actual step of opening the ends of adjacent solar cells, the degree of opening between the ends of adjacent solar cells is smaller, which is beneficial to reducing the risk of causing hidden cracks to the solar cells during the process of opening the solar cells. After inserting the film, the battery string can be moved relative to the film strip, and the film strip exposed outside can be inserted into the overlapping welding area, increasing the width of the film strip inserted into the overlapping welding area and improving the buffering capacity of the film strip for the overlapping welding area. At the same time, by adopting the method of moving the battery string, the remaining part of the film strip can be inserted into the insertion opening without further increasing the opening between the solar cells in the overlapping welding area, and the problem of further causing hidden cracks to the solar cells will not occur.

[0043] The following will elaborate on each embodiment of the present application in conjunction with the drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present application, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0044] Figure 1 It is a schematic cross-sectional structure diagram of a battery string provided in a film insertion method for a photovoltaic module according to an embodiment of the present application. Figure 2 It is a schematic top view structure diagram of a battery string provided in a film insertion method for a photovoltaic module according to an embodiment of the present application.

[0045] Refer to Figure 1 and Figure 2 , the film insertion method for a photovoltaic module includes: providing a battery string, the battery string includes: N solar cells arranged in sequence along the same direction, where each of the N solar cells 101 has an overlapping welding area 10, and the end of one solar cell 101 is stacked on the end of an adjacent another solar cell 101 to form the overlapping welding area 10, and N is greater than 1.

[0046] The cell 101 is used to absorb photons in the incident light and generate electron-hole pairs. The electron-hole pairs are separated by the built-in electric field in the cell 101, generating an electric potential at both ends of the PN junction, thereby converting light energy into electrical energy. In some embodiments, one surface of the cell 101 serves as the light-receiving surface for absorbing the incident light. In other embodiments, both surfaces of the cell 101 serve as the light-receiving surfaces for absorbing the incident light. In some embodiments, the cell 101 can be a crystalline silicon solar cell, such as a monocrystalline silicon solar cell or a polycrystalline silicon solar cell. It can be understood that in some embodiments, the cells 101 can be electrically connected in the form of multiple sub-cells (e.g., 1 / 2 sub-cells, 1 / 3 sub-cells, 1 / 4 sub-cells, etc.) to form multiple cell strings, and the multiple cell strings are electrically connected in series and / or parallel. In a specific example, the cells 101 are electrically connected in the form of 1 / 2 sub-cells, i.e., half-cells, and the half-cells are obtained by cutting a cell into two halves.

[0047] Among two adjacent cells 101, the end of one cell 101 is stacked with the end of the other cell 101, so that the number of cells 101 in the photovoltaic module per unit area is relatively large, which can increase the assembly density of the photovoltaic module and is beneficial to improving the module power.

[0048] It can be understood that each of the N cells, i.e., the cell 101, can have opposite first ends 21 and second ends 22. Among them, the first end 21 of the nth cell in the sequentially arranged N cells is stacked on the second end 22 of the (n - 1)th cell 101, where 1 < n ≤ N. In other words, the first end 21 of the second cell 101 in the sequentially arranged N cells is stacked on the second end 22 of the first cell 101, the first end 21 of the third cell 101 is stacked on the second end 22 of the second cell 101, and the subsequent sequentially arranged cells 101 are stacked in the above manner until the first end 21 of the Nth cell is stacked on the second end 22 of the (N - 1)th cell 101.

[0049] In some embodiments, the side corresponding to the first end 21 of the cell 101 can be a non-cutting edge, i.e., it can have a chamfer, and the side corresponding to the second end 22 can be a cutting edge, i.e., it can have no chamfer. In some embodiments, the side corresponding to the first end 21 of the cell 101 can also be a cutting edge, and the side corresponding to the second end 22 can also be a non-cutting edge.

[0050] In some embodiments, during the lamination of a photovoltaic module, since the thickness of the solder bonding area 10 is relatively large and it is first subjected to the lamination effect, the lamination stress on the solar cell 101 in the solder bonding area 10 is relatively large. Under such a large lamination stress, the solar cell 101 corresponding to the solder bonding area 10 may develop hidden cracks. Inserting a film strip between the solar cells 101 corresponding to the solder bonding area 10 allows the film strip to act as a buffer, which can relieve the lamination stress and thus reduce the risk of hidden cracks in the solar cell 101.

[0051] Figure 3 FIG. is a schematic cross-sectional structure diagram corresponding to the step of forming an insertion film opening in an insertion film method of a photovoltaic module provided in an embodiment of the present application. The method of inserting the film strip includes:

[0052] Referring to Figure 3 , first, the end of a solar cell 101 in a battery string and the end of an adjacent solar cell 101 are opened to form an insertion film opening 20 between the ends of the two adjacent solar cells 101. In some embodiments, the first end 21 of the nth solar cell is stacked on top of the second end 22 of the (n - 1)th solar cell 101, and the first end 21 of each solar cell 101 can be lifted, forming an insertion film opening 20 between the first end 21 and the second end 22 of the two solar cells 101. In some embodiments, a vacuum adsorption device can be used to adsorb and fix the first end 21 of the solar cell 101, and then the first end 21 is lifted, creating a gap between the first end 21 of a solar cell 101 corresponding to the solder bonding area 10 and the second end 22 of another solar cell 101, constituting the insertion film opening 20.

[0053] In some embodiments, the opening angle of the insertion film opening 20 is 15° to 30°, for example, it can be 15° to 20°, 20° to 25°, or 25° to 30°. Within the above range, the angle of the insertion film opening 20 remains relatively small, and the first end 21 of the solar cell 101 does not need to be lifted too high, reducing the risk of hidden cracks in the solar cell 101 during the step of forming the insertion film opening 20 due to the excessive lifting of the first end 21 of the solar cell 101. The opening angle of the insertion film opening 20 referred to here means the included angle between the end of a solar cell 101 used to form the insertion film opening 20 and the end of the adjacent solar cell 101.

[0054] In some embodiments, the opening angle of the insertion film opening 20 can also be less than 15° or greater than 30°, for example, it can be 10°, 13°, 35°, 40°, or 45°. The insertion film opening cannot be set too small, otherwise it will increase the difficulty of inserting the film strip into the insertion film opening. The insertion film opening also cannot be set too large, reducing the risk of hidden cracks during the step of forming the insertion film opening. Within the above angle range, the risk of hidden cracks can also be reduced to a certain extent.

[0055] In some embodiments, a suction cup may be provided on the surface of the first end portion 21 of the cell 101. A cavity may be provided inside the suction cup. By using a communication device to communicate the cavity inside the suction cup with a vacuum pump, the cavity can be evacuated, and then the first end portion 21 of the cell 101 can be adsorbed and fixed. After that, the first end portion 21 of the cell 101 is lifted to form an interlayer insertion opening 20.

[0056] Figure 4 FIG. is a schematic cross-sectional structure diagram corresponding to the step of inserting a part of the film strip into the interlayer insertion opening 20 in an interlayer insertion method of a photovoltaic module provided in an embodiment of the present application. Figure 5 FIG. is a schematic top view structure diagram corresponding to the step of inserting a part of the film strip into the interlayer insertion opening 20 in an interlayer insertion method of a photovoltaic module provided in an embodiment of the present application.

[0057] Referring to Figure 4 and Figure 5 , a film strip 102 is provided. A part of the film strip 102 is inserted into the interlayer insertion opening 20, and the remaining part of the film strip 102 is exposed on the cell 101 outside the interlayer insertion opening 20. In some embodiments, the film strip 102 has a first side and a second side opposite to each other in the width direction. The arrangement direction of the first side and the second side is the same as the arrangement direction of the first end portion 21 and the second end portion 22 of the cell 101. The second side of the film strip 102 is inserted into the interlayer insertion opening 20, and the first side of the film strip 102 remains outside the interlayer insertion opening 20. That is, in the interlayer insertion step, the film strip 102 is not entirely inserted into the interlayer insertion opening 20, so that the width of the film strip 102 inserted into the interlayer insertion opening 20 is small. In this way, the formed interlayer insertion opening 20 does not need to be too large, thereby reducing the height of the lifted first end portion 21 and preventing the problem that the first end portion 21 and the second end portion 22 are unevenly stressed due to the first end portion 21 of the cell 101 being lifted too high compared to the second end portion 22, resulting in cracking of the cell 101 during the formation of the interlayer insertion opening 20.

[0058] Referring to Figure 5, in the step of inserting a part of the film strip 102 into the film insertion opening 20, the ratio of the width d2 of the film strip 102 inserted into the film insertion opening to the width d1 of the film strip on the solar cell exposed outside the film insertion opening 20 is 1:5 to 5:1. For example, it can be 1:5 to 1:4.5, 1:4.5 to 1:3.5, 1:3.5 to 1:1.3, 1:3 to 1:2, 1:2 to 1:1, 1:1 to 1.5:1, 1.5:1 to 2:1, 2:1 to 2.5:1, 2.5:1 to 3:1, 3:1 to 4:1, 4:1 to 4.5:1, or 4.5:1 to 5:1. Within the above range, on the one hand, it ensures that the width of the film strip 102 inserted into the film insertion opening 20 in the film insertion step is not too small. Subsequently, in order to insert the film strip 102 exposed outside the film insertion opening 20 into the film insertion opening, in the step of moving the battery string, the moving amount of the battery string is small, avoiding damage to the arrangement of the solar cells in the battery string due to excessive movement of the battery string in the step of moving the battery string. On the other hand, it ensures that the width of the film strip 102 inserted into the film insertion opening 20 in the film insertion step is not too large, which is conducive to maintaining a small opening angle of the formed film insertion opening 20 and reducing the risk of solar cell microcracks.

[0059] In some embodiments, the provided film strip 102 needs to be pre-cut. In some embodiments, the film strip 102 drawn from the film strip coil can be cut by a film cutting device to obtain the film strip 102 with the required length. Then, the two ends of the cut film strip 102 are clamped by a clamping device, the film strip 102 is moved above the solar cell 101 corresponding to the film insertion opening 20, and the two ends of the film strip 102 are stretched in a direction away from each other to straighten the film strip 102, and then the film strip 102 is inserted into the film insertion opening 20.

[0060] Figure 6 It is a schematic cross-sectional structure diagram corresponding to the step of moving the battery string relative to the film strip 102 in a film insertion method of a photovoltaic module provided in an embodiment of the present application. Figure 7 It is a schematic top view structure diagram corresponding to the step of moving the battery string relative to the film strip 102 in a film insertion method of a photovoltaic module provided in an embodiment of the present application.

[0061] Reference Figure 6 And Figure 7 , move the battery string relative to the film strip 102 so that at least a part of the film strip 102 exposed outside the film insertion opening 20 is inserted into the film insertion opening 20. That is to say, fix the film strip 102 and move the film insertion opening 20 so that at least a part of the film strip 102 exposed outside the film insertion opening 20 enters the film insertion opening 20. In the step of moving the battery string, the entire battery string is moved, and each solar cell 101 in the battery string moves towards the film strip 102 exposed outside the film insertion opening 20, so that the film strip 102 exposed outside the film insertion opening 20 enters the film insertion opening 20.

[0062] In some embodiments, during the step of moving the battery string relative to the film strip 102, the end of the (n - 1)-th cell 101 and the end of the n-th cell placed in a stacked manner are kept open to keep the film insertion opening 20 open. During the movement of the battery string, the film insertion opening 20 can be kept unchanged, that is, there is no need to increase the opening between the cells 101 in the stacking and soldering region 10. By adopting the method of moving the battery string, the film strip 102 can enter the film insertion opening 20, so that the first end 21 of the cell 101 does not need to be further lifted, avoiding further cracking problems of the cell 101 and improving the phenomenon of latent cracks in the cell 101.

[0063] In some embodiments, inserting the film strip 102 at least partially exposed outside the film insertion opening 20 into the film insertion opening 20 includes: inserting the entire film strip 102 into the film insertion opening 20, that is, inserting the entire film strip 102 in the width direction into the film insertion opening 20. After the film insertion opening 20 is closed subsequently, the width of the film strip 102 between the cells 101 in the stacking and soldering region 10 is relatively large, which can provide a better buffering effect for the stacking and soldering region 10. Alternatively, inserting the film strip 102 partially exposed outside the film insertion opening 20 into the film insertion opening 20, that is, inserting the partial film strip 102 in the width direction exposed outside the film insertion opening 20 into the film insertion opening 20, and the first side edge of the film strip 102 still remains outside the film insertion opening 20.

[0064] After film insertion is completed, the film insertion opening 20 is closed to insert the film strip 102 between two cells 101 corresponding to the stacking and soldering region 10. In some embodiments, after the step of moving the battery string relative to the film strip 102, the orthographic projection of the film strip 102 on the cell 101 coincides with the stacking and soldering region 10. In some embodiments, the orthographic projection of the film strip 102 on the cell 101 exactly coincides with the stacking and soldering region 10. In some embodiments, the stacking and soldering region 10 is located within the orthographic projection of the film strip 102 on the cell 101, that is, the width of the film strip 102 is greater than the width of the stacking and soldering region 10, so that a part of the film strip 102 is also located on the surface of the cell 101 in the non-stacking and soldering region, further avoiding the problem of latent cracks in the cell 101 during the lamination process. This is because, during the lamination process, there may be an offset problem between adjacent cells 101 corresponding to the stacking and soldering region 10, causing the stacked width of adjacent cells 101 to become larger or smaller. If the stacked width of adjacent cells 101 becomes larger, since the film strip 102 is also located on the surface of the cell 101 corresponding to the non-stacking and soldering region, even if the cells 101 are displaced, it can provide a better buffering effect for the stacked region of adjacent cells 101. In some embodiments, the non-stacking and soldering region is the region of the cell 101 other than the stacking and soldering region 10.

[0065] In some embodiments, closing the film insertion opening 20 includes: adsorbing and fixing the first end of the originally lifted cell 101 by a vacuum adsorption device, lowering the first end of the cell 101 until the first end of one cell 101 is stacked on top of the second end of an adjacent cell 101, and closing the film insertion opening 20. Since the film strip 102 is located within the film insertion opening 20 and the film insertion opening 20 corresponds to the stacking welding area 10, after the film insertion opening 20 is closed, the film strip 102 is inserted between two cells 101 corresponding to the stacking welding area 10.

[0066] In some embodiments, the battery string may include only one string, and the film strip 102 may be partially inserted into a film insertion opening 20 in one battery string.

[0067] In some embodiments, providing the battery strings includes: forming a plurality of battery strings arranged at intervals along a preset direction. That is to say, in some embodiments, the battery strings may also be multiple strings. Before the film insertion step, the multiple battery strings are arranged along the preset direction. That is, the battery strings are pre-typeset. Subsequently, after the film insertion, there is no need to typeset the battery strings again, preventing the problem that the arrangement of the battery strings is damaged during the transportation process after the film insertion and increasing the subsequent typesetting difficulty.

[0068] In some embodiments, if there are multiple battery strings, the ends of a cell 101 in each battery string among the multiple battery strings are opened and separated from the ends of an adjacent cell 101 to form a film insertion opening 20. In some embodiments, if there are N cells in a battery string and a film insertion opening 20 is formed between every two adjacent cells 101, then one battery string has N - 1 film insertion openings 20. The method of opening the end of a cell 101 in each battery string among the multiple battery strings and the end of an adjacent cell 101 can refer to the method described above for opening the first end 21 of a cell 101 in a battery string and the second end 22 of an adjacent cell 101.

[0069] In some embodiments, providing the film strip 102 includes: providing a plurality of film strips, and each film strip 102 among the plurality of film strips is inserted into different film insertion openings 20 of each battery string. Each film strip 102 extends along a preset direction, and one film strip 102 is inserted into a film insertion opening 20 of each battery string among the multiple battery strings. That is to say, in the embodiments of the present application, each film strip 102 inserted into the film insertion opening 20 extends along the arrangement direction of the cells 101, and one film strip 102 is simultaneously inserted into a film insertion opening 20 corresponding to each battery string among the multiple battery strings. In this way, it is possible to perform simultaneous film insertion on multiple battery strings in the same film insertion step. After the subsequent film strip 102 is closed, one film strip 102 is inserted into a stacking welding area 10 of each battery string in all the battery strings, greatly improving the film insertion efficiency.

[0070] In some embodiments, each film strip 102 corresponds to a stack soldering region 10 in each cell string. That is to say, each film strip 102 among multiple film strips is inserted into different stack soldering regions 10 in a cell string, and one film strip 102 corresponds to one stack soldering region 10, such that each stack soldering region 10 in a cell string has a film strip 102 inserted therein.

[0071] For example, if the number of cell strings is 5, the number of cells 101 in each cell string is 5, 4 film insertion openings 20 can be formed in a cell string, then the number of film strips 102 can be 4, and each film strip 102 is respectively inserted into 4 different film insertion openings 20 in a cell string. And the same film strip 102 is simultaneously inserted into one film insertion opening 20 of each of the 5 cell strings. In this way, each film insertion opening 20 in multiple cell strings has a film strip 102 inserted therein.

[0072] In some embodiments, the step of inserting each of multiple film strips into one film insertion opening 20 of each of multiple cell strings includes:

[0073] Place each film strip 102 above each cell string. The film strip 102 extends along a preset direction, and each film strip 102 is aligned with one film insertion opening 20 in each cell string. In some embodiments, a film cutting device is used to cut a film strip roll to obtain multiple film strips 102 with required lengths. Then a clamping device is used to clamp both ends of each film strip 102, and the film strip 102 is moved above multiple cell strings, and each film strip 102 extends along the preset direction.

[0074] Stretch both ends of each film strip 102 along the preset direction in a direction away from each other, and lower each film strip 102 to insert each film strip 102 into the corresponding film insertion opening 20. Tighten each film strip 102, and one film strip 102 corresponds to one film insertion opening 20 in each of all cell strings. Insert the film strip 102 into the corresponding film insertion opening 20, that is, the same film strip 102 is inserted into one film insertion opening 20 of each of all cell strings.

[0075] Move the end of one cell 101 in each cell string and the end of the adjacent cell 101 in a direction close to each other to close the film insertion opening 20, and each film strip 102 inserted into the film insertion opening 20 is located between two cells 101 corresponding to the stack soldering region 10. In some embodiments, a vacuum adsorption device can be used to lower the first end 21 of the originally lifted cell 101, so that the first end 21 of the cell 101 and the second end 22 of the adjacent cell 101 are re-stacked, and the film insertion opening 20 is closed.

[0076] Figure 8 This is a top - view structural schematic diagram corresponding to the step of providing a battery string in another film - inserting method for a photovoltaic module provided by an embodiment of the present application.

[0077] Reference Figure 8 , in some embodiments, multiple battery strings may include a first sub - battery string 111 and a second sub - battery string 112 arranged alternately along a preset direction Z. In each first sub - battery string 111, the first battery cell 101 to the Nth battery cell are arranged in sequence along a first direction X. In each second sub - battery string 112, the first battery cell 101 to the Nth battery cell are arranged in sequence along a second direction Y, and the first direction X is opposite to the second direction Y. Each first sub - battery string 111 and each second sub - battery string 112 include N battery cells arranged in sequence along the same direction. Among them, the first end 21 of the nth battery cell is placed on the second end 22 of the (n - 1)th battery cell 101, where 1 < n ≤ N. The arrangement direction of the first battery cell 101 to the Nth battery cell in the first sub - battery string 111 is opposite to the arrangement direction of the first battery cell 101 to the Nth battery cell in the second sub - battery string 112. That is, in the first sub - battery string 111, the direction in which the first end 21 of each battery cell 101 points to the second end 22 is the first direction X, and in the second sub - battery string 112, the direction in which the first end 21 of each battery cell 101 points to the second end 22 is the second direction Y.

[0078] Inserting a film strip 102 into each battery string of multiple battery strings through an insertion film opening 20 includes:

[0079] Before the step of forming the insertion film opening 20, each second sub - battery string 112 is offset along the second direction Y with respect to each first sub - battery string 111.

[0080] In some embodiments, the method of forming each second sub - battery string 112 to be offset along the second direction Y with respect to each first sub - battery string 111 includes:

[0081] Forming a first sub - battery string 111 and a second sub - battery string 112 arranged alternately along a preset direction Z, and the first sub - battery string 111 and the second sub - battery string 112 are aligned and arranged in the preset direction Z. In some embodiments, a stack welder can be used to perform vacuum adsorption on each first sub - battery string 111 and each second sub - battery string 112. For example, the vacuum suction cups on the surface of each battery cell 101 can be adsorbed, so as to adsorb and fix the entire battery string. After adsorption and fixation, each first sub - battery string 111 and each second sub - battery string 112 are moved so that the first sub - battery string 111 and the second sub - battery string 112 are arranged alternately along the preset direction Z, and the first sub - battery string 111 and the second sub - battery string 112 are aligned in the preset direction Z.

[0082] In some embodiments, the second sub-battery string 112 can be moved along the second direction Y relative to each first sub-battery string 111, so that each second sub-battery string 112 is offset by a first offset d along the second direction Y with respect to each first sub-battery string 111. In some embodiments, after the string laminator adsorbs and fixes each first sub-battery string 111, the first sub-battery string 111 can be moved relative to each second sub-battery string 112, such that the offset of each first sub-battery string 111 with respect to each second sub-battery string 112 is the first offset d.

[0083] In some embodiments, the first sub-battery string 111 can also be moved along the first direction X relative to each second sub-battery string 112, so that each second sub-battery string 112 is offset by a first offset d along the second direction Y with respect to each first sub-battery string 111. That is, after the string laminator adsorbs and fixes each second sub-battery string 112, the second sub-battery string 112 can be moved relative to each first sub-battery string 111, such that the offset of each second sub-battery string 112 with respect to each first sub-battery string 111 is the first offset d.

[0084] In some embodiments, the second sub-battery string 112 can further be moved along the second direction Y with a first sub-offset relative to each first sub-battery string 111, and the first sub-battery string 111 can be moved along the first direction X with a second sub-offset relative to each second sub-battery string 112, and the sum of the first sub-offset and the second sub-offset is equal to the first offset d. That is, after the string laminator adsorbs and fixes each second sub-battery string 112 and each first sub-battery string 111, the first sub-battery string 111 and the second sub-battery string 112 are simultaneously moved in opposite directions, such that the offset between the first sub-battery string 111 and the second sub-battery string 112 is the first offset d.

[0085] In some embodiments, the number of film insertion openings 20 in each first sub-battery string 111 is the same as the number of film insertion openings 20 in each second sub-battery string 112, and each film insertion opening 20 in the first sub-battery string 111 can correspond to each film insertion opening 20 in the second sub-battery string 112 one by one. The same film strip 102 is inserted into one film insertion opening 20 of each first sub-battery string 111 and the corresponding film insertion opening 20 of each second sub-battery string 112. However, since each second sub-battery string 112 is offset along the second direction Y with respect to each first sub-battery string 111, one film insertion opening 20 in the first sub-battery string 111 and the corresponding one film insertion opening 20 in the second sub-battery string 112 are not arranged directly opposite to each other along the preset direction Z.

[0086] To ensure that the same film strip 102 can extend along the preset direction Z and be inserted into the film insertion openings 20 of each first sub-battery string 111 and the corresponding film insertion openings 20 of each second sub-battery string 112, the offset of each second sub-battery string 112 relative to each first sub-battery string 111 is set not to exceed the width of the battery cells 101 in each first sub-battery string 111 in the first direction X, and the first offset d of the second sub-battery string 112 relative to each first sub-battery string 111 is controlled to be 5 mm to 50 mm. For example, it can be 5 mm to 8 mm, 8 mm to 10 mm, 10 mm to 15 mm, 15 mm to 20 mm, 20 mm to 25 mm, 25 mm to 30 mm, 30 mm to 35 mm, 35 mm to 40 mm, 40 mm to 45 mm, or 45 mm to 50 mm. Within the above range, it can be ensured that the same film strip 102 can extend along the preset direction Z and be inserted into the film insertion openings 20 of each first sub-battery string 111 and the corresponding film insertion openings 20 of each second sub-battery string 112.

[0087] Figure 9 It is a top view structural schematic diagram corresponding to the step of partially inserting a film strip into a film insertion opening in another film insertion method of a photovoltaic module provided by an embodiment of the present application.

[0088] Reference Figure 9 , a plurality of film strips are provided, and each film strip 102 in the plurality of film strips is inserted into the corresponding film insertion opening 20.

[0089] Since the arrangement direction of the first battery cell 101 to the Nth battery cell in the first sub-battery string 111 is opposite to the arrangement direction of the first battery cell 101 to the Nth battery cell in the second sub-battery string 112, in the first sub-battery string 111, the opening of the formed film insertion opening 20 is opened on the second direction Y side, and in the second sub-battery string 112, the opening of the formed film insertion opening 20 is opened on the first direction X side. That is, the directions of the film insertion openings 20 of the first sub-battery string 111 and the second sub-battery string 112 are not on the same side. Thus, if the same film strip 102 is simultaneously inserted into a film insertion opening 20 of the first sub-battery string 111 and a film insertion opening 20 of the second sub-battery string 112, then among the film strip 102 exposed outside the film insertion opening 20, the part corresponding to the first sub-battery string 111 and the part corresponding to the second sub-battery string 112 are not on the same side of the film strip 102. In the subsequent step of moving the first sub-battery string 111 and the second sub-battery string 112 in the direction of approaching each other to align the first sub-battery string 111 and the second sub-battery string 112, since the moving direction of the first sub-battery string 111 is inconsistent with the moving direction of the second sub-battery string 112, the film strip 102 exposed outside the film insertion opening 20 can be respectively inserted into the film insertion opening 20 of the first sub-battery string 111 and the film insertion opening 20 of the second sub-battery string 112.

[0090] Specifically, in some embodiments, each of the multiple film strips includes: a first part 1 corresponding to each first sub-battery string 111, and a second part 2 corresponding to each second sub-battery string 112. The first part 1 includes: a first section 11 and a second section 12 arranged along the first direction X, and the second part 2 includes: a third section 13 and a fourth section 14 arranged along the first direction X; each second section 12 is inserted into an insertion film opening 20 of the corresponding first sub-battery string 111, and each first section 11 is exposed on the cell 101 of the corresponding first sub-battery string 111 outside the insertion film opening 20; each third section 13 is inserted into an insertion film opening 20 of the corresponding second sub-battery string 112, and each fourth section 14 is exposed on the cell 101 of the corresponding second sub-battery string 112 outside the insertion film opening 20.

[0091] The first part 1 and the second part 2 in each film strip 102 are alternately arranged along the preset direction Z. The first section 11 in the first part 1 and the third section 13 in the second part 2 are both located on the same side of the film strip 102 along the second direction Y, and the second end in the first part 1 and the fourth section 14 in the second part 2 are both located on the same side of the film strip 102 along the first direction X. Since the arrangement directions of the cells 101 in the first sub-battery string 111 and the second sub-battery string 112 are opposite, the opening direction of the insertion film opening 20 in the first sub-battery string 111 opens on the second direction Y side, and the opening direction of the insertion film opening 20 in the second sub-battery string 112 opens on the first direction X side. Therefore, the parts of the first part 1 and the second part 2 located on different sides are respectively inserted into the corresponding insertion film openings 20.

[0092] Specifically, the second section 12 of the first part 1 is inserted into the insertion film opening 20, the first end is exposed on the cell 101 outside the insertion film opening 20, the third section 13 of the second part 2 is inserted into the insertion film opening 20, and the fourth section 14 is exposed on the cell 101 outside the insertion film opening 20.

[0093] Figure 10 It is a top view structural schematic diagram corresponding to a step of moving the battery string relative to the film strip 102 in another film insertion method provided by an embodiment of the present application. Figure 11 It is a top view structural schematic diagram corresponding to another step of moving the battery string relative to the film strip 102 in another film insertion method provided by an embodiment of the present application.

[0094] Reference Figure 10 And Figure 11, move each first sub - battery string 111 relative to each film strip 102 in the second direction Y, so that at least part of each first section 11 is inserted into the film - inserting opening 20. The film - inserting opening 20 of the first sub - battery string 111 is opened on one side in the second direction Y. Therefore, by moving the first sub - battery string 111 in the second direction Y, at least part of the first section 11 that is not inserted into the film - inserting opening 20 can enter the film - inserting opening 20. Move each second sub - battery string 112 in the first direction X, so that at least part of each fourth section 14 is inserted into the film - inserting opening 20. The film - inserting opening 20 of the second sub - battery string 112 is opened on one side in the first direction X. Therefore, by moving the second sub - battery string 112 in the first direction X, at least part of the fourth section 14 that is not inserted into the film - inserting opening 20 can enter the film - inserting opening 20. After moving each first sub - battery string 111 and each second sub - battery string 112, each first sub - battery string 111 and each second sub - battery string 112 can be aligned and arranged in the preset direction Z to complete the layout regularization of multiple battery strings.

[0095] In some embodiments, at least part of each first section 11 being inserted into the film - inserting opening 20 includes, referring to Figure 10 , part of the first section 11 enters the film - inserting opening 20, and the edge of the film strip 102 corresponding to the first section 11 still protrudes outside the film - inserting opening 20; referring to Figure 11 , or all of the first section 11 enters the film - inserting opening 20.

[0096] In some embodiments, at least part of each fourth section 14 being inserted into the film - inserting opening 20 includes, referring to Figure 10 , part of the fourth section 14 enters the film - inserting opening 20, and the edge of the film strip 102 corresponding to the fourth section 14 still protrudes outside the film - inserting opening 20; referring to Figure 11 , or all of the fourth section 14 enters the film - inserting opening 20.

[0097] It is not difficult to find that in the embodiments of the present application, by arranging the first sub - battery string 111 and the second sub - battery string 112 in a staggered manner, and inserting part of the same film strip 102 into a film - inserting opening 20 of each first sub - battery string 111 and a film - inserting opening 20 of each second sub - battery string 112, film - inserting for each battery string is realized when the film - inserting opening 20 is relatively small, improving the film - inserting efficiency. After the subsequent film - inserting is completed, the battery chip 101 is moved again so that the first sub - battery string 111 and the second sub - battery string 112 are aligned and arranged. This not only completes the layout regularization of the battery strings, but also enables the film strip 102 with the remaining part protruding outside the film - inserting opening 20 to enter the film - inserting opening 20, so that more film strips 102 enter the film - inserting opening 20. Subsequently, the width of the film strip 102 in the overlapping soldering area 10 increases, enhancing the buffering effect of the film strip 102 on the overlapping soldering area 10 and greatly saving efficiency.

[0098] In some embodiments, moving each first sub - battery string 111 relative to each film strip 102 in the second direction Y and moving each second sub - battery string 112 relative to each film strip 102 in the first direction X includes: fixing each film strip 102, moving each cell 101 of the first sub - battery string 111 in the second direction Y by a first displacement amount, and moving each cell 101 of the second sub - battery string 112 in the first direction X by a second displacement amount. That is to say, in the step of moving each first sub - battery string 111 and each second sub - battery string 112, the displacement amounts of each cell 101 in each first sub - battery string 111 are the same, and the displacement amounts of each cell 101 in each second sub - battery string 112 are the same. Furthermore, the relative position relationship between adjacent cells 101 can be maintained unchanged, improving the success rate of film insertion.

[0099] In some embodiments, the offset of each second sub - battery string 112 relative to each first sub - battery string 111 in the second direction Y is a first offset d. The moving amount of moving each first sub - battery string 111 relative to each film strip 102 in the second direction Y is a first displacement amount, and the moving amount of moving each second sub - battery string 112 relative to each film strip 102 in the first direction X is a second displacement amount. The sum of the first displacement amount and the second displacement amount is equal to the first offset d. After the film - insertion step, move each first sub - battery string 111 and each second sub - battery string 112 in the direction of approaching each other. The sum of the displacement amounts of each first sub - battery string 111 and each second sub - battery string 112 is equal to the offset between each second sub - battery string 112 and each first sub - battery string 111 before the film - insertion step, so that after moving each first sub - battery string 111 and each second sub - battery string 112 in the direction of approaching each other, the offset between each second sub - battery string 112 and each first sub - battery string 111 before the film - insertion step can be exactly eliminated, enabling each second sub - battery string 112 and each first sub - battery string 111 to be aligned and arranged in the preset direction Z, thereby regularizing the battery strings.

[0100] In some embodiments, the first displacement amount is equal to the second displacement amount. In some embodiments, in the step of moving each first sub - battery string 111 and each second sub - battery string 112 in the direction of approaching each other, the displacement amount of moving each first sub - battery string 111 in the second direction Y is the same as the displacement amount of moving each second sub - battery string 112 in the first direction X, which is beneficial to synchronously notify the movement of each first sub - battery string 111 and the movement of each second sub - battery string 112.

[0101] In some embodiments, the first displacement amount may also not be equal to the second displacement amount. For example, the first displacement amount may be greater than the second displacement amount, or the first displacement amount may be less than the second displacement amount. The embodiments of the present application do not limit the specific relationship between the first displacement amount and the second displacement amount, and only need to satisfy that the sum of the first displacement amount and the second displacement amount is equal to the first offset d.

[0102] Figure 12 FIG. 4 is a top view structural diagram corresponding to the step of providing a battery string in another film inserting method for a photovoltaic module provided by an embodiment of the present application. Figure 13 FIG. 5 is a top view structural diagram corresponding to the step of partially inserting the film strip 102 into the film inserting opening 20 in another film inserting method for a photovoltaic module provided by an embodiment of the present application.

[0103] Referring to Figure 12 , in some embodiments, among multiple battery strings, the first battery cell 101 to the Nth battery cell in two adjacent battery strings may also be arranged in sequence along the first direction X, and two adjacent battery strings are arranged in alignment along the preset direction Z. That is to say, in two adjacent battery strings, the arrangement directions of the battery cells 101 are the same, so that the openings of the film inserting openings 20 in each battery string are all opened in the second direction Y, that is, the film inserting openings 20 of adjacent battery strings are opened on the same side.

[0104] Referring to Figure 13 , inserting each of multiple film strips into one film inserting opening 20 of each of multiple battery strings includes:

[0105] Providing multiple film strips, each of the multiple film strips includes a third part 3 and a fourth part 4 arranged along the first direction X, and both the third part 3 and the fourth part 4 extend along the preset direction Z. Among them, the third part 3 of the same film strip 102 straddles multiple battery strings, and the fourth part 4 straddles multiple battery strings.

[0106] Inserting the fourth part 4 of a film strip 102 into one film inserting opening 20 of each of multiple battery strings, and the third part 3 is exposed on the battery cell 101 outside the film inserting opening 20. In some embodiments, multiple battery strings are arranged in alignment along the preset direction Z, then each film inserting opening 20 in one battery string is arranged in one-to-one correspondence with each film inserting opening 20 in an adjacent another battery string along the preset direction Z. Since the film inserting openings 20 of adjacent battery strings are opened on the same side, therefore, the fourth part 4 on one side of the same film strip 102 is simultaneously inserted into one film inserting opening 20 of each of multiple battery strings, and the third part 3 on the other side of the same film strip 102 is exposed on the battery cell 101 outside the film inserting opening 20.

[0107] Figure 14A top view structural schematic diagram corresponding to a step of moving a battery string relative to a film strip 102 in another film inserting method provided by an embodiment of the present application. Figure 15 A top view structural schematic diagram corresponding to another step of moving a battery string relative to a film strip 102 in another film inserting method provided by an embodiment of the present application.

[0108] Reference Figure 14 And Figure 15 With reference to

[0109] In some embodiments, at least a part of the third part 3 entering the film inserting opening 20 includes: with reference to Figure 14 , a part of the third part 3 enters the film inserting opening 20, so that the edge of the film strip 102 corresponding to the third part 3 still exposes outside the film inserting opening 20. Or, with reference to Figure 15 , all of the third part 3 enters the film inserting opening 20.

[0110] In the film inserting method of the photovoltaic module provided in the above embodiment, the film strip 102 is partially inserted into the film inserting opening 20. Compared with the case where the film strip 102 is completely inserted into the film inserting opening 20, the opening of the film inserting opening 20 can be smaller. In this way, in the actual step of opening the ends of adjacent battery wafers 101, the opening degree between the ends of adjacent battery wafers 101 is smaller, which is beneficial to reducing the risk of causing hidden cracks to the battery wafers 101 during the process of opening the battery wafers 101. After film inserting, moving the battery string relative to the film strip 102 can insert the exposed film strip 102 into the stacking welding area 10, increase the width of the film strip 102 inserted into the stacking welding area 10, and improve the buffering ability of the film strip 102 to the stacking welding area 10. At the same time, by adopting the method of moving the battery string, the remaining part of the film strip 102 can be inserted into the film inserting opening 20 without further increasing the opening between the battery wafers 101 in the stacking welding area 10, and no further hidden crack problem will be caused.

[0111] Correspondingly, another embodiment of the present application further provides a photovoltaic module. With reference to Figure 16, the photovoltaic module includes: a battery string, the battery string includes: N battery cells arranged in sequence in the same direction, where each of the N battery cells 101 has a stack welding area 10, and the end of one battery cell 101 is stacked on the end of an adjacent another battery cell 101 to form the stack welding area 10, and N is greater than 1. The photovoltaic module further includes: a plurality of film strips formed between two battery cells 101 corresponding to different stack welding areas 10 of each battery string in the way of inserting film as provided in the above embodiments, and each film strip 102 in the plurality of film strips corresponds to one stack welding area 10 in the battery string one by one. The photovoltaic module further includes: a packaging layer 202 for covering the surface of each battery string. The photovoltaic module further includes: a cover plate 203 for covering the surface of the packaging layer away from the battery string.

[0112] In some embodiments, the photovoltaic module may include a plurality of battery strings arranged along a preset direction Z. Each of the plurality of battery strings includes: N battery cells arranged in sequence in the same direction, where each of the N battery cells 101 has a stack welding area 10, and the end of one battery cell 101 is stacked on the end of an adjacent another battery cell 101 to form the stack welding area 10, and N is greater than 1. Each of the plurality of film strips 102 extends along the preset direction Z, and the same film strip 102 is inserted between the battery cells 101 corresponding to one stack welding area 10 of each of the plurality of battery strings at the same time. Each of the plurality of film strips 102 corresponds to one stack welding area 10 in each battery string one by one.

[0113] In some embodiments, the plurality of battery strings may include a first sub-battery string 111 and a second sub-battery string 112 arranged alternately along the preset direction Z. In each first sub-battery string 111, the first battery cell 101 to the Nth battery cell are arranged in sequence along a first direction X. In each second sub-battery string 112, the first battery cell 101 to the Nth battery cell are arranged in sequence along a second direction Y, and the first direction X is opposite to the second direction Y. The same film strip 102 is inserted into an insertion film opening 20 of each first sub-battery string 111 and an insertion film opening 20 of each second sub-battery string 112.

[0114] In some embodiments, among the plurality of battery strings, the first battery cell 101 to the Nth battery cell in two adjacent battery strings may also be arranged in sequence along the first direction X, and the same film strip 102 is inserted into an insertion film opening 20 of each battery string.

[0115] Specifically, in some embodiments, multiple battery strings can be electrically connected through conductive bands. In some embodiments, the conductive bands can be welding tapes, which are used to connect two adjacent solar cells 101 in series. The welding tapes can be located on the surface of the solar cells 101 for electrically connecting two adjacent solar cells 101. In some embodiments, the welding tapes can be formed before the step of forming multiple film bands.

[0116] The encapsulation layer 202 covers the front and back of the substrate of the solar cell 101. Specifically, the encapsulation layer 202 can be an ethylene-vinyl acetate copolymer (EVA) film, a polyethylene octene elastomer (POE) film, a polyethylene terephthalate (PET) film, a polyvinyl butyral (PVB) film, or other organic encapsulation films. In some embodiments, the cover plate 203 can be a glass cover plate, a plastic cover plate, or other cover plates 203 with a light-transmitting function. Specifically, the surface of the cover plate 203 facing the encapsulation layer 202 can be an uneven surface, thereby increasing the utilization rate of incident light.

[0117] Correspondingly, an embodiment of the present application also provides a method for manufacturing a photovoltaic module, which can be used to manufacture the photovoltaic module provided in the above embodiments. The method for manufacturing a photovoltaic module includes:

[0118] First, prepare the battery strings. In some embodiments, the battery strings can be made by a string welding machine. The solar cells 101 are stacked and arranged in series in sequence, and the welding tapes are laid on the surface of the solar cells 101, and the solar cells 101 are welded into a string by the welding tapes. The connected battery strings are arranged in sequence along the preset direction Z by a typesetting machine.

[0119] Next, adopt the film inserting method of the photovoltaic module provided in the above embodiments to form multiple film bands between two solar cells 101 corresponding to different overlapping welding areas 10 of each battery string. Each film band 102 in the multiple film bands corresponds to one overlapping welding area 10 in each battery string.

[0120] Next, prepare the encapsulation layer and the cover plate. In some embodiments, the encapsulation layer includes: an upper film and a lower film, and the cover plate includes: an upper cover plate and a lower cover plate.

[0121] In some embodiments, the lower film and the upper film with the required size can be obtained by cutting with a film cutting machine, and the lower film is laid on the lower cover plate.

[0122] Next, lay the typeset multiple battery strings on the lower film.

[0123] Next, lay the upper film on the surface of the battery strings, and lay the upper cover plate on the upper film.

[0124] Finally, laminating the adhesive film, the upper cover plate, the battery string, the lower adhesive film and the lower cover plate. During the lamination process, the lower cover plate melts through the lower adhesive film and the upper adhesive film and becomes integrated with the upper cover plate and the upper adhesive film to form an inseparable photovoltaic module.

[0125] Although this application is disclosed above with preferred embodiments, it is not used to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the protection scope of this application should be subject to the scope defined by the claims of this application.

[0126] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing this application. In actual applications, various changes can be made in form and details without departing from the spirit and scope of this application. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of this application. Therefore, the protection scope of this application should be subject to the scope defined by the claims.

Claims

1. A film insertion method for a photovoltaic module, characterized in that, Comprising: Providing a battery string, the battery string comprising: N battery cells arranged in sequence in the same direction, wherein each of the N battery cells has a stack soldering area, and an end portion of one battery cell is stacked on an end portion of an adjacent another battery cell to form the stack soldering area, N>1; Opening an end portion of one battery cell in the battery string and an end portion of an adjacent another battery cell to form an interlayer film insertion opening between the end portions of the adjacent two battery cells, and an opening angle of the interlayer film insertion opening being 15°-30°; Providing an interlayer film belt, inserting a part of the interlayer film belt into the interlayer film insertion opening, and the remaining part of the interlayer film belt being exposed on the battery cell outside the interlayer film insertion opening, and a ratio of a width of the interlayer film belt inserted into the interlayer film insertion opening to a width of the interlayer film belt exposed on the battery cell outside the interlayer film insertion opening being 1:5-5:1; Moving the battery string relative to the interlayer film belt so that at least a part of the interlayer film belt exposed outside the interlayer film insertion opening is inserted into the interlayer film insertion opening; Closing the interlayer film insertion opening so that the interlayer film belt is inserted between the two battery cells corresponding to the stack soldering area.

2. The film inserting method of the photovoltaic module according to claim 1, characterized in that, The providing the battery string comprises: forming a plurality of battery strings arranged at intervals in a preset direction, and opening an end portion of one battery cell in each of the plurality of battery strings and an end portion of an adjacent another battery cell to form the interlayer film insertion opening; the providing the interlayer film belt comprises: providing a plurality of interlayer film belts, each of the plurality of interlayer film belts being inserted into different interlayer film insertion openings of each of the plurality of battery strings, each of the interlayer film belts extending along the preset direction, and one interlayer film belt being inserted into an interlayer film insertion opening of each of the plurality of battery strings; each of the interlayer film belts corresponds to a stack soldering area in each of the plurality of battery strings.

3. The film inserting method of the photovoltaic module according to claim 2, wherein The plurality of battery strings comprise a first sub-battery string and a second sub-battery string arranged alternately in the preset direction. In each of the first sub-battery strings, the first battery cell to the Nth battery cell are arranged in sequence in a first direction. In each of the second sub-battery strings, the first battery cell to the Nth battery cell are arranged in sequence in a second direction, and the first direction is opposite to the second direction; the inserting one interlayer film belt into an interlayer film insertion opening of each of the plurality of battery strings comprises: Before the step of forming the interlayer film insertion opening, offsetting each of the second sub-battery strings along the second direction with respect to each of the first sub-battery strings; Providing a plurality of interlayer film belts, each of the plurality of interlayer film belts comprising: a first part corresponding to each of the first sub-battery strings, and a second part corresponding to each of the second sub-battery strings, the first part comprising: a first section and a second section arranged in the first direction, the second part comprising: a third section and a fourth section arranged in the first direction; Insert each of the second segments into a film-insertion opening of the corresponding first sub-battery string, and expose each of the first segments on the cell of the corresponding first sub-battery string outside the film-insertion opening; insert each of the third segments into a film-insertion opening of each of the corresponding second sub-battery strings, and expose each of the fourth segments on the cell of the corresponding second sub-battery string outside the film-insertion opening. Move each of the first sub-battery strings relative to each of the film tapes in the second direction so that at least a part of each of the first segments is inserted into the film-insertion opening, and move each of the second sub-battery strings in the first direction so that at least a part of each of the fourth segments is inserted into the film-insertion opening, and align each of the first sub-battery strings and each of the second sub-battery strings in the preset direction.

4. The film insertion method of the photovoltaic module according to claim 3, wherein, The offset amount of each of the second sub-battery strings relative to each of the first sub-battery strings in the second direction is a first offset amount, the movement amount of moving each of the first sub-battery strings relative to each of the film tapes in the second direction is a first displacement amount, the movement amount of moving each of the second sub-battery strings relative to each of the film tapes in the first direction is a second displacement amount, and the sum of the first displacement amount and the second displacement amount is equal to the first offset amount.

5. The film inserting method of the photovoltaic module according to claim 4, wherein The first displacement amount is equal to the second displacement amount.

6. The film insertion method of the photovoltaic module according to claim 4, characterized in that, Moving each of the first sub-battery strings relative to each of the film tapes in the second direction and moving each of the second sub-battery strings relative to each of the film tapes in the first direction includes: fixing each of the film tapes, moving each cell of the first sub-battery strings in the second direction by the first displacement amount, and moving each cell of the second sub-battery strings in the first direction by the second displacement amount.

7. The film inserting method of the photovoltaic module according to claim 4, characterized in that The method of forming that each of the second sub-battery strings is offset relative to each of the first sub-battery strings in the second direction includes: Forming the first sub-battery strings and the second sub-battery strings that are alternately arranged in the preset direction, and aligning the first sub-battery strings and the second sub-battery strings in the preset direction; Moving the second sub-battery strings relative to each of the first sub-battery strings in the second direction so that each of the second sub-battery strings is offset by the first offset amount relative to each of the first sub-battery strings in the second direction; or moving the first sub-battery strings relative to each of the second sub-battery strings in the first direction so that each of the second sub-battery strings is offset by the first offset amount relative to each of the first sub-battery strings in the second direction; or moving the second sub-battery strings relative to each of the first sub-battery strings by a first sub-offset amount in the second direction and moving the first sub-battery strings relative to each of the second sub-battery strings by a second sub-offset amount in the first direction, and the sum of the first sub-offset amount and the second sub-offset amount is equal to the first offset amount.

8. The film inserting method of the photovoltaic module according to claim 2, wherein Among the multiple battery strings, the first to the Nth battery cells in two adjacent battery strings are arranged in sequence along a first direction, and the two adjacent battery strings are arranged in alignment along the preset direction. The insertion of each of the multiple film strips into one of the insertion film openings of each of the multiple battery strings includes: Providing multiple film strips, each of the multiple film strips including a third part and a fourth part arranged along the first direction, both the third part and the fourth part extending along the preset direction; Inserting the fourth part of one of the film strips into one of the insertion film openings of each of the multiple battery strings, with the third part exposed on the battery cells outside the insertion film opening; Moving each of the battery strings in a second direction relative to each of the film strips, so that at least part of the fourth part of the film strip is inserted into the insertion film opening.

9. The film inserting method of the photovoltaic module according to claim 1, wherein, The insertion of at least part of the film strip exposed outside the insertion film opening into the insertion film opening includes: inserting the entire film strip into the insertion film opening; or inserting the part of the film strip exposed outside the insertion film opening into the insertion film opening.

10. The film inserting method of the photovoltaic module according to claim 9, characterized in that, After the step of moving the battery string relative to the film strip, the orthographic projection of the film strip on the battery cell coincides with the overlapping soldering area.

11. The film insertion method of the photovoltaic module according to claim 2, wherein, The step of inserting each of the multiple film strips into one of the insertion film openings of each of the multiple battery strings includes: Placing each of the film strips above each of the battery strings, the film strip extending along the preset direction, and each of the film strips being opposite to one of the insertion film openings in each of the battery strings; Stretching the two ends of each of the film strips along the preset direction in a direction away from each other, and lowering each of the film strips to insert each of the film strips into the corresponding insertion film opening; Moving the end of one of the battery cells in each of the battery strings and the end of the adjacent battery cell in a direction close to each other to close the insertion film opening, and each of the film strips inserted into the insertion film opening is located between two battery cells corresponding to the overlapping soldering area.

12. The film inserting method of the photovoltaic module according to claim 11, wherein, During the step of moving each of the battery strings relative to each of the film strips, keep the insertion film opening open.

13. A photovoltaic module, characterized in that, Including: Battery string, including: N battery cells arranged in sequence along the same direction, where each of the N battery cells has an overlapping soldering area, and the end of one battery cell is stacked on the end of an adjacent another battery cell to form the overlapping soldering area, N>1; Multiple film strips formed between two battery cells corresponding to different overlapping soldering areas of the battery string by the film strip insertion method of the photovoltaic module according to any one of claims 1-12, each of the multiple film strips corresponding to one overlapping soldering area in the battery string; Encapsulation layer, which is used to cover the surface of the battery string; Cover plate, which is used to cover the surface of the encapsulation layer away from the battery string.

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