XBC photovoltaic cell modules

Abstract

This invention discloses an XBC photovoltaic cell module, including a back glass, solar cells, and a back film. The back glass has a pre-fabricated circuit, which includes interconnecting strips and busbars. The interconnecting strips have conductive pads, and the busbars have lead-out contacts. The solar cells have conductive solder joints and are stacked with the back glass. The positions of the conductive solder joints and conductive pads are adapted to each other. The back film is stacked between the back glass and the solar cells, and the back film has openings adapted to the conductive pads. This invention utilizes a back glass with pre-fabricated circuitry to interconnect multiple solar cells, eliminating the need for solder strips and the soldering process. This avoids solar cell warping or breakage caused by solder strip welding, simplifies the manufacturing process, and improves processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to an XBC photovoltaic cell module. Background Technology

[0002] In photovoltaic cell technology, back contact (BC) technology improves conversion efficiency by removing the front grid lines of the cell and placing electrodes only on the back, thus reducing front shading. However, the encapsulation of back contact cell modules uses a solder ribbon welding process. When the back electrode of the cell is welded to the solder ribbon, the cell is heated as a whole. The localized high temperature at the solder ribbon connection point (e.g., 200~300℃) can cause thermal stress concentration in the cell, which can easily lead to warping after cooling, and in severe cases, even fragmentation. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an XBC photovoltaic cell module that enables interconnection between multiple cells through pre-fabricated circuits on the back glass, eliminating the need for solder strips and avoiding cell warping or breakage caused by solder strip welding.

[0004] On one hand, embodiments of the present invention provide an XBC photovoltaic cell module, comprising:

[0005] The back glass has a pre-fabricated circuit, which includes interconnecting strips and busbars. The interconnecting strips have conductive pads, and the busbars have lead-out contacts.

[0006] The battery cell is provided with conductive solder joints, and the battery cell is stacked with the back glass. The position of the conductive solder joints is adapted to the position of the conductive pads.

[0007] A back adhesive film is laminated between the back glass and the battery cell, and the back adhesive film has an opening adapted to the conductive pad.

[0008] According to some embodiments of the present invention, a through hole is provided on the back glass and adapted to the position of the lead-out contact, and the lead-out contact is located in the through hole.

[0009] According to some embodiments of the present invention, the conductive pad is melted after local alloying welding and then welded to the conductive solder joint.

[0010] According to some embodiments of the present invention, the XBC photovoltaic cell module further includes a front glass and a front encapsulating film, wherein the front glass is stacked with the cell and the front encapsulating film is stacked between the cell and the front encapsulating film.

[0011] According to some embodiments of the present invention, the gap between the back glass and the battery cell is filled with an elastic buffer pad or coated with a buffer adhesive.

[0012] According to some embodiments of the present invention, the XBC photovoltaic cell module further includes a junction box, the bottom of which is provided with an extended conductive contact, the conductive contact being conductively connected to the lead-out contact.

[0013] According to some embodiments of the present invention, the junction box and the battery are distributed on opposite sides of the back glass, and the junction box and the back glass are bonded together by sealant.

[0014] According to some embodiments of the present invention, the conductive pads and the conductive solder joints are mutually adapted concave-convex structures, or the conductive pads and the conductive solder joints are both mirror-symmetric structures.

[0015] According to some embodiments of the present invention, the surface of the conductive pad is coated with flux.

[0016] On the other hand, embodiments of the present invention provide an XBC photovoltaic cell module, comprising:

[0017] The back glass has a pre-fabricated circuit, which includes interconnecting strips and busbars. The interconnecting strips have conductive pads, and the busbars have lead-out contacts.

[0018] A battery cell is provided with conductive solder joints, and the battery cell is stacked with the back glass, wherein the conductive solder joints are connected to the conductive pads;

[0019] A back adhesive film is applied between the back glass and the battery cell;

[0020] The front glass is stacked with the battery cell;

[0021] A front adhesive film is applied between the front glass and the battery cell;

[0022] A junction box is attached to the back glass and distributed on opposite sides of the back glass along with the battery cells. The junction box is electrically connected to the lead-out contacts.

[0023] The embodiments of the present invention have at least the following beneficial effects:

[0024] By using a back glass with pre-fabricated circuitry to interconnect multiple solar cells, the solder strips and soldering process can be eliminated. This avoids solar cell warping or breakage caused by solder strip welding, simplifies the manufacturing process, and improves processing efficiency.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is one of the schematic diagrams of the stacked structure of the XBC photovoltaic cell module according to an embodiment of the present invention;

[0028] Figure 2 This is a second schematic diagram of the stacked structure of the XBC photovoltaic cell module according to an embodiment of the present invention;

[0029] Figure 3 This is the third schematic diagram of the stacked structure of the XBC photovoltaic cell module according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the planar structure of the back glass of the XBC photovoltaic cell module according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the planar structure of the XBC photovoltaic cell module according to an embodiment of the present invention.

[0032] Figure label:

[0033] Back glass 100, through hole 101, interconnecting strip 110, conductive pad 111, busbar 120, lead-out contact 121, battery cell 200, conductive solder joint 210, back adhesive film 300, window opening 301, front glass 400, front adhesive film 500, junction box 600, conductive contact 610. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0036] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, and "above," "below," "within," etc. are understood to include the stated number. If "first," "second," etc. are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0037] In the description of this invention, unless otherwise explicitly defined, terms such as "set", "install", and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0038] The traditional manufacturing process of photovoltaic cells includes material preparation, cell welding, layout, stacking, and lamination. Cell welding involves using welding ribbons to weld multiple cells 200 arranged on an assembly line, achieving series connection between them. Layout involves neatly stacking multiple sets of series-connected cells 200 onto the back glass 100 according to a preset arrangement. Stacking involves welding the busbar 120 to the welding ribbons of the multiple sets of cells 200 stacked on the back glass 100, achieving interconnection between them. Lamination refers to pressing the stacked back glass 100, back film 300, cells 200, front film 500, and front glass 400 together. During the cell welding process, when the back electrode of the cell 200 is welded to the welding ribbons, localized high temperatures (e.g., 200~300℃) can cause thermal stress concentration in the cell 200, leading to warping after cooling and, in severe cases, fragmentation. In addition, there is contact resistance at the welding interface between the welding ribbon and the electrode of the solar cell 200, which is usually ≥200mΩ, accounting for 300%~400% of the internal loss of the photovoltaic cell, resulting in low conversion efficiency of the photovoltaic cell. Furthermore, the tension of the welding ribbon during the welding process can easily cause microcracks in the solar cell 200, which will further increase the current transmission loss.

[0039] Therefore, this embodiment discloses an XBC photovoltaic cell module that can interconnect multiple cells 200 through prefabricated circuits on the back glass 100, eliminating the need for solder ribbons and avoiding the warping or fragmentation of the cells 200 caused by solder ribbon welding.

[0040] Please refer to Figure 1This embodiment discloses an XBC photovoltaic cell module, including a back glass 100, a cell 200, and a back film 300. The back glass 100 is provided with a pre-fabricated circuit, which includes interconnecting strips 110 and busbars 120. The interconnecting strips 110 are provided with conductive pads 111, and the busbars 120 are provided with lead-out contacts 121. The cell 200 is provided with conductive solder joints 210. The cell 200 and the back glass 100 are stacked together, and the positions of the conductive solder joints 210 are adapted to the positions of the conductive pads 111. The back film 300 is stacked between the back glass 100 and the cell 200, and the back film 300 is provided with an opening 301 adapted to the conductive pads 111.

[0041] To facilitate understanding of the inventive concept of the XBC photovoltaic cell module in this embodiment, the following description is provided in conjunction with the preparation method of the XBC photovoltaic cell module.

[0042] At the beginning of production, materials need to be prepared, including back glass 100, solar cells 200, and back adhesive film 300, etc., with multiple solar cells 200. In traditional processes, the back glass 100 is a flat and smooth glass structure. However, in this embodiment, a pre-fabricated circuit is set on the back glass 100. The pre-fabricated circuit includes interconnecting strips 110 and busbars 120. The interconnecting strips 110 can replace traditional solder ribbons to achieve series connection between different solar cells 200. The solar cells 200 in this embodiment are XBC cells. The metal contacts (such as conductive solder joints 210) of the solar cells 200 are all located on the same side to facilitate connection with the interconnecting strips 110. XBC cell technology is a back contact solar cell technology. "X" represents that it can be combined with various technologies, such as TOPCon (tunneling oxide passivated contact) and HJT (heterojunction technology). It can be combined with TOPCon technology to form TBC, or with HJT technology to form HBC. The XBC battery places both the PN junction and metal contacts on the back of the battery, while the front is covered with an anti-reflective passivation film. This avoids the metal electrodes blocking the front surface, maximizing the utilization of incident light, reducing optical losses, and increasing the effective power generation area, thereby achieving high conversion efficiency and making the battery module more aesthetically pleasing. The busbar 120 and interconnecting strip 110 are pre-connected, eliminating the need for the traditional lap welding process; that is, there is no need to weld the busbar 120 to the solder strip.

[0043] In some application examples, a through hole 101 is provided on the back glass 100 at a position adapted to the lead-out contact 121. The lead-out contact 121 is located in the through hole 101 and can be used to output the electrical energy generated by the battery cell 200 to the outside through the lead-out contact 121.

[0044] The back adhesive film 300 can be made of EVA film, EPE film, or POE film, etc. EVA film is a thermosetting and adhesive film. EVA is short for Polyethylene vinylacetate. EPE stands for Expandable Polyethylene, a non-crosslinked closed-cell material made of low-density polyethylene (LDPE) through a physical foaming process. POE stands for Polyolefin Elastomer, a synthetic biodegradable polymer material. The back adhesive film 300 needs to be pre-processed with openings 301 whose position and size are adapted to the conductive pads 111, so that the conductive pads 111 and conductive solder joints 210 can be connected to each other after lamination assembly.

[0045] After stacking and assembling the back glass 100, the back adhesive film 300, and the solar cell 200, the semi-finished structure of the XBC photovoltaic module described above can be obtained. The back adhesive film 300, after subsequent lamination, can act as an adhesive between the back glass 100 and the solar cell 200.

[0046] In some application examples, the stacking assembly process includes: placing the back glass 100 on a platform for fixation, stacking the back adhesive film 300 on the back glass 100, and then stacking the solar cell 200 on the back adhesive film 300 to complete the stacking assembly. It should be noted that the stacking assembly process is usually completed by automated equipment with high alignment accuracy, ensuring precise alignment of the back glass 100, the back adhesive film 300, and the solar cell 200. For example, the position of the window 301 on the back adhesive film 300 can be adapted to the position of the conductive pad 111 on the back glass 100, and the position of the conductive solder joint 210 on the solar cell 200 can be adapted to the position of the conductive pad 111 on the back glass 100.

[0047] After completing the stacked assembly, the conductive pads 111 of the back glass 100 and the conductive solder joints 210 of the battery cell 200 need to be welded. Since the back glass 100 and the battery cell 200 are stacked together, and the conductive pads 111 and conductive solder joints 210 are located on opposite inner sides of the back glass 100 and the battery cell 200, it is difficult to weld them using conventional welding methods. In this embodiment, the conductive pads 111 and conductive solder joints 210 are locally alloyed. After local alloying welding, the conductive pads 111 melt and are welded to the conductive solder joints 210, thus achieving welding between the two. Furthermore, the short duration of local alloying welding avoids thermal stress concentration and effectively prevents the battery cell 200 from warping or fragmenting after welding cooling. Local alloying welding can be achieved using pulsed thermocompression welding technology. Pulsed thermocompression welding involves applying a certain pulse voltage to the hot press head, heating the hot press head, and raising the temperature of the object connected to the hot press head, thereby achieving the purpose of fusion welding. Conventional cell 200 welding uses infrared heating to heat the entire cell 200, which in turn heats the solder ribbon on the cell 200 and connects it to the main grid line of the cell 200. This process is prone to uneven stress, which can cause the cell 200 to warp after welding. In this embodiment, the working temperature is controlled at 220~240℃, which can reduce the heat of welding to a certain extent. Moreover, the heating time is 8~10 seconds. While ensuring that the melting depth of the solder joint is ≥70%, the heating time is shortened, which can further reduce the concentration of thermal stress. Local heating is performed at the position where the back glass 100 and the conductive pad 111 are adapted, and the heat is radiated to the conductive solder joint 210 of the battery cell 200, so that the conductive pad 111 is in a hot melt state and connected to the conductive solder joint 210. There is no need to weld the battery cell 200, which can greatly reduce the stress problem of the battery cell 200. The pressure of the hot press head is 3~5N, and the applied pressure is small and evenly applied to the welding area. Since the solder strip is eliminated and the battery cell 200 is directly connected through the interconnecting strip 110, ultra-low stress is achieved, which can avoid local stress concentration and prevent the battery cell 200 from warping or breaking after cooling, thus ensuring the reliability of the battery cell 200.

[0048] In some application examples, the conductive pad 111 and the conductive solder joint 210 are mutually adaptable concave-convex structures. For example, the conductive pad 111 is an annular structure and the conductive solder joint 210 is a circular structure. The circular conductive solder joint 210 can be inserted into the middle of the annular conductive pad 111 to achieve a tight fit. Alternatively, in other application examples, the conductive pad 111 and the conductive solder joint 210 can both be mirror-symmetric structures, such as circular structures, and their surfaces are suitable for interconnection.

[0049] In some application examples, the surface of the conductive pad 111 is coated with flux. For example, the flux can be applied after the conductive pad 111 has been fabricated, or it can be applied as a separate process after the material preparation stage. Flux helps improve the soldering performance between the conductive pad 111 and the conductive solder joint 210.

[0050] Please refer to Figure 2 After the back glass 100 and the solar cell 200 are welded together, the front glass 400, the front encapsulant film 500, and the aforementioned semi-finished structure can be stacked and assembled. Therefore, the XBC photovoltaic module also includes the front glass 400 and the front encapsulant film 500. The front glass 400 is stacked with the solar cell 200, and the front encapsulant film 500 is stacked between the solar cell 200 and the front encapsulant film 500. It should be considered that the front glass 400 and the front encapsulant film 500 can be prepared in advance during the material preparation stage. The material of the front glass 400 can be the same as that of the back glass 100, and the material of the front encapsulant film 500 can be the same as that of the back encapsulant film 300. It is worth mentioning that in the traditional process, the welding strips need to be welded using busbars 120 in the stacking process, and then the front encapsulant film 500 and the front glass 400 are stacked and assembled. Since the prefabricated circuit of the back glass 100 in this embodiment has already completed the interconnection of the busbars 120 and the interconnecting strips 110, and the conductive connection of the conductive pads 111 and the conductive solder joints 210 has been completed in the aforementioned steps, the basic circuit of the photovoltaic cell has been connected, and it can be directly laminated. Compared with the conventional process, the method of this embodiment can eliminate the welding process between the busbars 120 and the solder strips, which is beneficial to save materials and shorten production time, thereby reducing production costs and improving production efficiency. It is worth mentioning that no circuit structure is provided on the front glass 400 in this embodiment, therefore, the alignment accuracy requirements between the front glass 400 and the solar cell 200 and the back glass 100 can be reduced.

[0051] After the lamination assembly is completed, an elastic buffer pad or a buffer adhesive can be applied to the gap between the back glass 100 and the solar cell 200. Therefore, in some application examples of XBC photovoltaic modules, the gap between the back glass 100 and the solar cell 200 is filled with an elastic buffer pad or coated with a buffer adhesive. Filling the gap between the solar cell 200 and the back glass 100 with an elastic buffer pad allows for the formation of a stress-relieving layer after lamination and curing, effectively preventing warping of the solar cell 200. The elastic buffer pad is made of silicone sheet with a thickness of 0.1~0.2mm and a hardness of 50~60 Shore A. Alternatively, a buffer adhesive can be pre-applied to the gap between the edge of the solar cell 200 and the pre-fabricated circuitry of the back glass 100, and then filled during lamination. After curing, a buffer layer with a hardness of 40~50 Shore A is formed to prevent mechanical stress concentration. The buffer adhesive can be silicone rubber with a viscosity of 500~800 cP (centipoise). By filling gaps and applying segmented pressure, the uniformity of lamination pressure distribution can be effectively improved, reducing internal residual stress to below 5MPa, which is far lower than the ≥15MPa of traditional processes. This helps to improve the resistance to mechanical loads and thus avoid cell warping.

[0052] After the stacked assembly is completed, the semi-finished structure of the photovoltaic module in the stacked assembly state is sent into the lamination equipment for pressing, so that the back film 300 and the front film 500 undergo a chemical cross-linking reaction, thereby achieving bonding between the back glass 100 and the cell 200 through the back film 300, and bonding between the cell 200 and the front glass 400 through the front film 500.

[0053] Please refer to Figure 3After the pressing is completed, the basic structure of the XBC photovoltaic module is obtained. The junction box 600 can be installed on the back glass 100 to facilitate the output of the electrical energy generated by the XBC photovoltaic module. Therefore, in some application examples, the XBC photovoltaic module also includes a junction box 600. The bottom of the junction box 600 is provided with an extended conductive contact 610, which is conductively connected to the lead-out contact 121. Since the busbar 120 in this embodiment is prefabricated on the back glass 100, unlike the traditional bendable structure, the busbar 120 in this embodiment is directly connected to the conductive contact 610 of the junction box 600 through the lead-out contact 121. For example, the conductive contact 610 at the bottom of the junction box 600 protrudes from the bottom surface of the junction box 600 and has a certain mechanical strength. When the back glass 100 has a through hole 101, during assembly, the conductive contact 610 of the junction box 600 is inserted into the through hole 101 of the back glass 100 until the conductive contact 610 abuts against the lead-out contact 121 of the busbar 120, thereby realizing the conductive connection between the junction box 600 and the busbar 120. The assembly method is simple and convenient.

[0054] Furthermore, the junction box 600 and the solar cell 200 are located on opposite sides of the back glass 100, and the junction box 600 and the back glass 100 are bonded together with sealant. The solar cell 200 is located between the back glass 100 and the front glass 400. In order to reduce the front shading of the XBC photovoltaic module, the junction box 600 is installed on the back of the back glass 100, and the junction box 600 is bonded to the back glass 100 with sealant, thereby sealing and protecting the conductive contact 610 and the lead contact 121, and ensuring the conductivity of the connection position.

[0055] This embodiment utilizes a back glass 100 with pre-fabricated circuitry to interconnect multiple battery cells 200, eliminating the need for solder strips and soldering processes. This avoids warping or fragmentation of the battery cells 200 caused by solder strip welding, simplifies the manufacturing process, and improves processing efficiency.

[0056] After processing using the above-described preparation method, XBC photovoltaic cell modules can be obtained. Therefore, please refer to [the above instructions]. Figures 1 to 5This embodiment also provides an XBC photovoltaic cell module, including a back glass 100, a cell 200, a back film 300, a front glass 400, a front film 500, and a junction box 600. The back glass 100 is provided with a pre-fabricated circuit, which includes interconnecting strips 110 and busbars 120. The interconnecting strips 110 are provided with conductive pads 111, and the busbars 120 are provided with lead-out contacts 121. The battery cell 200 is provided with conductive solder joints 210. The battery cell 200 and the back glass 100 are stacked together. The conductive solder joints 210 are connected to the conductive pads 111. The back adhesive film 300 is pasted between the back glass 100 and the battery cell 200. The front glass 400 is stacked with the battery cell 200. The front adhesive film 500 is pasted between the front glass 400 and the battery cell 200. The junction box 600 is attached to the back glass 100 and is distributed on opposite sides of the back glass 100 with the battery cell 200. The junction box 600 is conductively connected to the lead-out contact 121. Specifically, the bottom of the junction box 600 is provided with an extended conductive contact 610. The back glass 100 is provided with a through hole 101. The lead-out contact 121 is located in the through hole 101. The conductive contact 610 of the junction box 600 is inserted into the through hole 101 and is conductively connected to the lead-out contact 121.

[0057] Among them, the interconnecting strip 110 is divided into N-type interconnecting strips and P-type interconnecting strips. The N-type interconnecting strip is used to connect the negative electrode of the battery cell 200. The N-type interconnecting strip is provided with N-type conductive pads 111, such as... Figure 4 The square pads shown on the left, with P-type interconnects used to connect the positive electrode of the solar cell 200, have P-type conductive pads 111 on them. Figure 4 The circular pads are shown on the right. It should be noted that... Figure 4 The shape of the conductive pads 111 shown is for differentiation only and not the actual shape of the pads. Interconnect strips 110 of the same type are connected to corresponding bus strips 120 to output electrical energy through the bus strips 120.

[0058] The solar cell 200 has embedded grid lines, and conductive solder joints 210 are connected to the embedded grid lines, thereby transmitting the electrical energy generated by the solar cell 200 to the pre-fabricated circuit of the back glass through the conductive solder joints 210. The N-type interconnecting strip, the solar cell, and the P-type interconnecting strip form a current loop, thereby transmitting electrical energy to the lead-out contacts of the busbar, and then realizing the external output of electrical energy through the junction box.

[0059] This embodiment utilizes a back glass 100 with pre-fabricated circuitry to interconnect multiple battery cells 200, eliminating the need for solder strips and soldering processes. This avoids warping or fragmentation of the battery cells 200 caused by solder strip welding, simplifies the manufacturing process, and improves processing efficiency.

[0060] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An XBC photovoltaic cell module, characterized in that, include: The back glass (100) is provided with a pre-fabricated circuit, which includes a connected interconnect strip (110) and a bus strip (120). The interconnect strip (110) is provided with a conductive pad (111), and the bus strip (120) is provided with a lead-out contact (121). The battery cell (200) is provided with conductive solder joints (210). The battery cell (200) is stacked with the back glass (100). The position of the conductive solder joints (210) is adapted to the position of the conductive pads (111). The conductive pads (111) are melted after local alloying welding and welded to the conductive solder joints (210). The pressure of the hot press head for local alloying welding is 3~5N. A back adhesive film (300) is stacked between the back glass (100) and the battery cell (200), and the back adhesive film (300) is provided with an opening (301) adapted to the conductive pad (111).

2. The XBC photovoltaic cell module according to claim 1, characterized in that, A through hole (101) is provided on the back glass (100) at a position adapted to the lead-out contact (121), and the lead-out contact (121) is located inside the through hole (101).

3. The XBC photovoltaic cell module according to claim 1, characterized in that, The XBC photovoltaic cell module also includes a front glass (400) and a front encapsulant film (500), wherein the front glass (400) is stacked with the cell (200), and the front encapsulant film (500) is stacked between the cell (200) and the front encapsulant film (500).

4. The XBC photovoltaic cell module according to claim 1, characterized in that, The gap between the back glass (100) and the battery cell (200) is filled with an elastic cushioning pad or coated with a cushioning adhesive.

5. The XBC photovoltaic module according to any one of claims 1 to 4, characterized in that, The XBC photovoltaic cell module also includes a junction box (600), the bottom of which is provided with an extended conductive contact (610), which is conductively connected to the lead-out contact (121).

6. The XBC photovoltaic cell module according to claim 5, characterized in that, The junction box (600) and the battery (200) are distributed on opposite sides of the back glass (100), and the junction box (600) and the back glass (100) are connected by adhesive.

7. The XBC photovoltaic cell module according to claim 1, characterized in that, The conductive pad (111) and the conductive solder joint (210) are mutually compatible concave-convex structures, or the conductive pad (111) and the conductive solder joint (210) are both mirror-symmetric structures.

8. The XBC photovoltaic cell module according to claim 1, characterized in that, The surface of the conductive pad (111) is coated with flux.

9. An XBC photovoltaic cell module, characterized in that, include: The back glass (100) is provided with a pre-fabricated circuit, which includes a connected interconnect strip (110) and a bus strip (120). The interconnect strip (110) is provided with a conductive pad (111), and the bus strip (120) is provided with a lead-out contact (121). The battery cell (200) is provided with conductive solder joints (210). The battery cell (200) is stacked with the back glass (100). The conductive solder pad (111) is melted after local alloying welding and welded to the conductive solder joints (210). The pressure of the hot press head for local alloying welding is 3~5N. A back adhesive film (300) is pasted between the back glass (100) and the battery cell (200); The front glass (400) is stacked with the battery cell (200); A front adhesive film (500) is pasted between the front glass (400) and the battery cell (200); A junction box (600) is attached to the back glass (100) and distributed on opposite sides of the back glass (100) with the battery (200). The junction box (600) is electrically connected to the lead-out contact (121).

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