A welding press and apparatus, battery assembly and welding method, photovoltaic system

Abstract

This application relates to the field of solar cell technology, providing a welding press and apparatus, a cell module and welding method, and a photovoltaic system. The welding press is used to press a solder strip placed on a solar cell. The solar cell includes an insulating layer and multiple solder joints. The insulating layer has multiple openings, and the solder joints are located in the openings. The top of the solder joint is lower than the top of the insulating layer, forming a groove with the insulating layer. The welding press includes a pressure plate and a filler. When the welding press presses the solder strip and the solar cell, the filler presses the solder strip above the solder joint into the groove, causing the solder strip to contact the solder joint. Thus, because the filler presses the solder strip above the solder joint into the groove, making the solder strip contact the solder joint, it avoids the gap between the solder strip and the solder joint caused by the top of the solder joint being lower than the top of the insulating layer, thereby achieving contact between the solder strip and the solder joint and improving welding defects.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and particularly relates to a welding fixture and equipment, a battery module and welding method, and a photovoltaic system. Background Technology

[0002] Solar cell power generation is a sustainable and clean energy source that uses the photovoltaic effect of semiconductor pn junctions to convert sunlight into electrical energy.

[0003] Related technologies typically utilize solder ribbons to connect two adjacent solar cells, thus creating a cell string, which is then encapsulated into a solar module. This extends the lifespan of the solar cells and improves their reliability. However, the insulating layer of solar cells is usually higher than the solder joint, causing the solder ribbon to be suspended above the solder joint by the higher insulating layer when placed on the solar cell, preventing it from making contact with the solder joint. Current welding clamps also cannot effectively ensure contact between the solder ribbon and the solder joint.

[0004] Therefore, how to achieve contact between the solder strip and the solder joint when the insulation layer is higher than the solder joint has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a welding press and equipment, a battery module and welding method, and a photovoltaic system, aiming to solve the problem of how to achieve contact between the solder strip and the solder joint when the insulation layer is higher than the solder joint.

[0006] In a first aspect, the welding press provided in this application is used to press a solder strip placed on a solar cell. The solar cell includes an insulating layer and a plurality of solder joints. The insulating layer has a plurality of openings, and the solder joints are located in the openings. The top of the solder joint is lower than the top of the insulating layer, and the solder joints and the insulating layer form a groove. The welding press includes a pressure plate and a filler. When the welding press presses the solder strip and the solar cell, the filler presses the solder strip located above the solder joint into the groove, so that the solder strip contacts the solder joint.

[0007] Optionally, the pressure plate is a transparent pressure plate, and the filler is a transparent filler.

[0008] Optionally, the filler includes a protrusion extending to one side from the pressure plate. When the welding press presses the solder strip and the solar cell, the protrusion extends into the groove, pressing the solder strip located above the solder joint into the groove to contact the solder joint.

[0009] Optionally, the height of the protrusion is equal to the depth of the groove.

[0010] Optionally, the filler includes a flexible plate disposed on one side of the pressure plate. When the welding press presses down on the welding strip and the solar cell, the flexible plate deforms and extends into the groove, pressing the welding strip located above the welding point into the groove to contact the welding point.

[0011] Optionally, when the welding press presses down on the welding strip and the solar cell, the welding press and the solar cell form a closed space. The welding press has a vacuum fitting part, which works with a vacuuming device to perform vacuuming treatment on the closed space. After the vacuuming treatment of the closed space, the flexible plate deforms and presses the welding strip into the groove.

[0012] Optionally, the flexible sheet includes a silicone sheet.

[0013] Secondly, the welding equipment provided in this application includes welding fixtures as described above.

[0014] Thirdly, the battery module provided in this application uses any of the above-mentioned welding presses to press the solder strips placed on the solar cells during the welding process.

[0015] Fourthly, the welding method for the battery assembly provided in this application includes:

[0016] A plurality of solar cells are provided, each solar cell including an insulating layer and a plurality of solder joints, the insulating layer having a plurality of openings, the solder joints being disposed in the openings, the top of the solder joints being lower than the top of the insulating layer, and the solder joints and the insulating layer forming a groove;

[0017] A solder strip is placed on one or more of the solar cells, the solder strip being positioned above the solder joint;

[0018] The welding press is used to press the welding strip and the solar cell. The welding press includes a pressure plate and a filler. The filler presses the welding strip into the groove so that the welding strip contacts the solder joint.

[0019] The welding strip and the weld point are welded using a welding machine.

[0020] Optionally, the pressure plate is a transparent pressure plate, the filler is a transparent filler, and the welder includes a laser. The welding of the weld strip and the weld point using the welder includes:

[0021] Using a laser, the solder strip and the solder joint are welded through the transparent pressure plate and the transparent filler.

[0022] Optionally, the filler includes a protrusion extending to one side from the pressure plate, and a welding press is used to press the solder strip and the solar cell, comprising:

[0023] Place the pressure plate and the protrusion on the welding strip;

[0024] The protrusion is inserted into the groove, and the solder strip located above the solder joint is pressed into the groove to contact the solder joint.

[0025] Optionally, the filler includes a flexible plate disposed on one side of the pressure plate, and the welding strip and the solar cell are pressed together by a welding press, comprising:

[0026] The flexible plate and the pressure plate are placed sequentially on the welding strip;

[0027] The flexible plate is deformed and extends into the groove, pressing the welding strip located above the welding point into the groove to contact the welding point.

[0028] Optionally, the welding fixture and the solar cell form a closed space, deforming the flexible plate, including:

[0029] A vacuuming device is used to vacuum the enclosed space from the vacuuming mating part of the welding press, causing the flexible plate to deform.

[0030] Fifthly, the battery module provided in this application is welded using any of the above-mentioned battery module welding methods.

[0031] Sixthly, the photovoltaic system provided in this application includes the aforementioned battery modules.

[0032] The welding fixture and equipment, battery module and welding method, and photovoltaic system of the present application embodiments, since the filler of the welding fixture presses the welding strip located above the weld point into the groove so that the welding strip contacts the weld point, can avoid the gap between the welding strip and the weld point caused by the top of the weld point being lower than the top of the insulating layer, thus achieving contact between the welding strip and the weld point and improving welding defects. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a welding press according to an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of a welding method for a battery assembly according to an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a welding press according to an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of a welding method for a battery assembly according to an embodiment of this application;

[0037] Figure 5This is a schematic flowchart of a welding method for a battery assembly according to an embodiment of this application;

[0038] Figure 6 This is a schematic flowchart of a welding method for a battery assembly according to an embodiment of this application;

[0039] Figure 7 This is a schematic flowchart of a welding method for a battery assembly according to an embodiment of this application;

[0040] Figure 8 This is a schematic flowchart of a welding method for a battery assembly according to an embodiment of this application;

[0041] Explanation of key component symbols:

[0042] 30 welding strip, 20 solar cell, 21 insulating layer, 22 welding point, 23 groove, 10 welding press, 11 pressure plate, 12 filler, 121 protrusion, 122 flexible plate. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] In this application, since the filler of the welding fixture presses the welding strip located above the weld point into the groove so that the welding strip contacts the weld point, it can avoid the gap between the welding strip and the weld point caused by the top of the weld point being lower than the top of the insulation layer, thus achieving contact between the welding strip and the weld point and improving welding defects.

[0045] Example 1

[0046] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The welding press 10 of this application embodiment is used to press the solder strip 30 placed on the solar cell 20. The solar cell 20 includes an insulating layer 21 and a plurality of solder joints 22. The insulating layer 21 has a plurality of openings, and the solder joints 22 are located in the openings. The top of the solder joints 22 is lower than the top of the insulating layer 21, and the solder joints 22 and the insulating layer 21 form a groove 23. The welding press 10 includes a pressure plate 11 and a filler 12. When the welding press 10 presses the solder strip 30 and the solar cell 20, the filler 12 presses the solder strip 30 located above the solder joints 22 into the groove 23, so that the solder strip 30 contacts the solder joints 22.

[0047] In the welding press 10 of this application embodiment, since the filler 12 of the welding press 10 presses the welding strip 30 located above the welding point 22 into the groove 23 so that the welding strip 30 contacts the welding point 22, it can avoid the gap between the welding strip 30 and the welding point 22 caused by the top of the welding point 22 being lower than the top of the insulating layer 21, thus preventing them from making contact. In this way, the welding strip 30 and the welding point 22 can be made in contact, improving the welding defects.

[0048] Specifically, the solar cell 20 is an interdigitated back contact (IBC) cell. In this way, the front of the IBC cell is unobstructed, and the solder ribbons 30 are all located on the back, reducing optical loss and resulting in higher power generation efficiency and better aesthetics. It is understood that in other embodiments, the solar cell 20 may also be a bi-faced contact cell.

[0049] Specifically, the insulating layer 21 includes at least one of a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, and an aluminum oxide layer. The number of insulating layers 21 can be one, two, three, or other. No specific form or number of insulating layers 21 is limited herein.

[0050] Specifically, the pressure plate 11 can be a continuous plate. In other words, the pressure plate 11 has no open areas. In this way, the area covered by the pressure plate 11 on the solar cell 20 can be pressed more comprehensively, resulting in a better pressing effect. It is understood that in other embodiments, the pressure plate 11 may also have open areas.

[0051] Specifically, the pressure plate 11 can cover all the solder joints 22 and the corresponding solder strips 30 of the solar cell 20. In this way, all the solder strips 30 can be pressed tightly at the same time, which helps to improve the welding efficiency.

[0052] It is understood that in other embodiments, the pressure plate 11 may cover one or more solder joints 22 and a corresponding section of solder ribbon 30 in a row of solder joints 22 of the solar cell 20; the pressure plate 11 may cover a row of solder joints 22 and a corresponding section of solder ribbon 30 of the solar cell 20; or the pressure plate 11 may cover multiple rows of solder joints 22 and multiple corresponding sections of solder ribbon 30 of the solar cell 20. The specific extent of the solder joints 22 and solder ribbon 30 covered by the pressure plate 11 is not limited here.

[0053] Specifically, the filler 12 is detachably connected to the pressure plate 11. This allows the pressure plate 11 and filler 12 to be placed together when the welding press 10 is placed, and also facilitates the replacement and maintenance of the filler 12. Furthermore, the filler 12 and pressure plate 11 can be detachably connected via clips, screws, or the like.

[0054] Specifically, the filler 12 presses the solder ribbon 30 located above each solder joint 22 into the corresponding groove 23. This ensures that the solder ribbon 30 contacts all solder joints 22. It is understood that in other embodiments, the filler 12 may also press the solder ribbon 30 located above only a portion of the solder joints 22 into the corresponding groove 23. This ensures that the solder ribbon 30 contacts only a portion of the solder joints 22.

[0055] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0056] Example 2

[0057] In some alternative embodiments, the pressure plate 11 is a transparent pressure plate 11, and the filler 12 is a transparent filler 12.

[0058] Thus, since both the pressure plate 11 and the filler 12 are transparent, they will not obstruct the weld joint 22, making welding convenient. Moreover, when welding with a laser, the laser can pass through the transparent pressure plate 11 and the filler 12, thereby achieving welding.

[0059] Specifically, the pressure plate 11 is a transparent glass plate. This high transparency and readily available material improve welding quality and reduce costs.

[0060] Specifically, the light transmittance of the pressure plate 11 and the filler 12 can be greater than or equal to 90%. For example, 90%, 92%, 95%, 98%, or 100%. This results in high light transmittance of the pressure plate 11 and the filler 12, thus improving their transparency and facilitating welding.

[0061] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0062] Example 3

[0063] Please see Figure 1 and Figure 2 In some alternative embodiments, the filler 12 includes a protrusion 121 that protrudes to one side from the pressure plate 11. When the welding press 10 presses the solder strip 30 and the solar cell 20, the protrusion 121 extends into the groove 23 and presses the solder strip 30 located above the solder point 22 into the groove 23 to contact the solder point 22.

[0064] In this way, the protrusion 121 extending into the groove 23 presses the solder strip 30 located above the solder joint 22 into the groove 23 to contact the solder joint 22. The structure is simple, highly targeted, and the contact effect between the solder strip 30 and the solder joint 22 is good.

[0065] Specifically, there can be multiple protrusions 121. Each protrusion 121 can correspond to all the grooves 23. In this way, all the welding strips 30 and the welding points 22 can be pressed together at the same time, which helps to improve welding efficiency.

[0066] It is understood that in other embodiments, the plurality of protrusions 121 may correspond to one, more, or all of the grooves 23 in a row of grooves 23; the plurality of protrusions 121 may correspond to multiple rows of grooves 23. The specific correspondence between the protrusions 121 and the grooves 23 is not limited here.

[0067] Specifically, the protrusion direction of the protrusion 121 is perpendicular to the plane of the pressure plate 11. This allows the protrusion 121 to be inserted vertically into the groove 23, thereby improving the effect of pressing in the welding strip 30.

[0068] Specifically, protrusion 121 is cuboid. This makes the shape of protrusion 121 relatively regular and easier to manufacture. It is understood that in other embodiments, protrusion 121 may also be a cube, frustum, prism, frustum of a cone, cylinder, or other shapes.

[0069] Specifically, the protrusion 121 and the pressure plate 11 can be integrally formed. Furthermore, the protrusion 121 and the pressure plate 11 can be made of the same material. This facilitates manufacturing and improves production efficiency. It is also understood that the protrusion 121 and the pressure plate 11 can be separately formed and then connected as one piece.

[0070] Specifically, the ratio of the bottom area of ​​the protrusion 121 to the bottom area of ​​the groove 23 is 0.4-1. For example, it is 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1. This ensures that the bottom areas of the protrusion 121 and the groove 23 are within a suitable range, avoiding damage to the solder strip 30 due to excessive pressure during the pressing process if the ratio is too small, and also avoiding the inability to press into the groove 23 if the ratio is too large.

[0071] In some alternative embodiments, the protrusion 121 corresponds one-to-one with the groove 23.

[0072] This facilitates the alignment of the protrusion 121 and the groove 23, which helps improve welding efficiency. Furthermore, it ensures that each groove 23 has a corresponding protrusion 121, thereby guaranteeing that each weld point 22 is in contact with the weld strip 30, which improves the welding effect.

[0073] It is understood that the protrusions 121 and the grooves 23 are in one-to-one correspondence, meaning that the number of protrusions 121 and the number of grooves 23 are in one-to-one correspondence, that is, one protrusion 121 corresponds to one groove 23. It is also understood that in other embodiments, multiple protrusions 121 may correspond to one groove 23.

[0074] It can be understood that the protrusion 121 and the groove 23 correspond one-to-one, or it can refer to the one-to-one correspondence between the positions of the protrusion 121 and the groove 23. In this way, misalignment of the protrusion 121 and the groove 23 is avoided, which helps to improve welding efficiency.

[0075] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0076] Example 4

[0077] Please see Figure 1 and Figure 2 In some alternative embodiments, the height of the protrusion 121 is equal to the depth of the groove 23.

[0078] This avoids a gap between the pressure plate 11 and the solder strip 30 located on the insulating layer 21 caused by an excessively large height of the protrusion 121. After the protrusion 121 presses the solder strip 30 above the solder joint 22 into the groove 23, the pressure plate 11 and the solder strip 30 on the insulating layer 21 also come into close contact, further pressing the solder strip 30 and thus improving the welding effect. Furthermore, it avoids the problem of the protrusion 121 being too small, which would make it difficult to press the solder strip 30 to the solder joint 22, ensuring contact between the solder strip 30 and the solder joint 22.

[0079] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0080] Example 5

[0081] Please see Figure 3 and Figure 4 In some alternative embodiments, the filler 12 includes a flexible plate 122 disposed on one side of the pressure plate 11. When the welding press 10 presses down on the welding strip 30 and the solar cell 20, the flexible plate 122 deforms and extends into the groove 23, pressing the welding strip 30 located above the welding point 22 into the groove 23 to contact the welding point 22.

[0082] In this way, the filler 12 has a flexible shape and can adapt to various shapes and positions of the grooves 23. It is not necessary to design and manufacture the filler 12 specifically for each type of solar cell 20, nor is it necessary to precisely align each groove 23, which helps to reduce costs and improve efficiency.

[0083] Specifically, the projection of the flexible plate 122 onto the plane of the pressure plate 11 completely overlaps with the inner wall of the pressure plate 11. In this way, the flexible plate 122 fully covers the inner wall of the pressure plate 11, thereby avoiding the omission of the groove 23 in the area covered by the pressure plate 11 when the welding press 10 presses down on the welding strip 30 and the solar cell 20.

[0084] It is understood that in other embodiments, the projection of the flexible plate 122 onto the plane of the pressure plate 11 may partially overlap with the inner wall of the pressure plate 11; the projection of the flexible plate 122 onto the plane of the pressure plate 11 may be located within the inner wall of the pressure plate 11; or the projection of the flexible plate 122 onto the plane of the pressure plate 11 may cover and extend beyond the inner wall of the pressure plate 11. The relationship between the flexible plate 122 and the pressure plate 11 is not limited here.

[0085] Specifically, the flexible plate 122 can be a continuous plate shape. In other words, the flexible plate 122 has no open areas. In this way, the area covered by the pressure plate 11 on the solar cell 20 can be more comprehensively covered, avoiding omission of the groove 23 in the area covered by the pressure plate 11. It is understood that in other embodiments, the flexible plate 122 may also have open areas.

[0086] Specifically, the flexible plate 122 can cover all the solder joints 22 and the corresponding solder strips 30 of the solar cell 20. In this way, the solder strips 30 can be pressed into all the grooves 23 to contact all the solder joints 22 at the same time, which helps to improve the welding efficiency.

[0087] It is understood that in other embodiments, the flexible plate 122 may cover one or more solder joints 22 and a corresponding section of solder ribbon 30 in a row of solder joints 22 of the solar cell 20; the flexible plate 122 may cover a row of solder joints 22 and a corresponding section of solder ribbon 30 of the solar cell 20; or the flexible plate 122 may cover multiple rows of solder joints 22 and multiple corresponding sections of solder ribbon 30 of the solar cell 20. The specific extent of the solder joints 22 and solder ribbon 30 covered by the flexible plate 122 is not limited here.

[0088] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0089] Example 6

[0090] Please see Figure 3 and Figure 4 In some alternative embodiments, when the welding press 10 presses down the welding strip 30 and the solar cell 20, the welding press 10 and the solar cell 20 form a closed space. The welding press 10 has a vacuum fitting part, which works with a vacuuming device to vacuum the closed space. After the vacuuming of the closed space, the flexible plate 122 deforms and presses the welding strip 30 into the groove 23.

[0091] In this way, the flexible plate 122 can be deformed by vacuuming, which is simple and efficient and will not damage the solar cell 20 and the solder ribbon 30.

[0092] Specifically, the welding press 10 includes multiple sidewalls extending from the edge of the pressure plate 11 toward the flexible plate 122. The flexible plate 122 and the multiple sidewalls form a receiving space, and the flexible plate 122, the multiple sidewalls, and the solar cell 20 can form a closed space. In this way, while the welding press 10 presses down on the solar cell 20 and the solder strip 30, it forms a closed space, which facilitates vacuuming. Furthermore, the vacuuming mating part can be located on the sidewall of the welding press 10.

[0093] It is understandable that the solar cell 20 can be placed in the containment space and placed on the welding platform, with the flexible plate 122, multiple side walls, solar cell 20 and welding platform forming a closed space.

[0094] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0095] Example 7

[0096] In some alternative embodiments, the flexible plate 122 includes a silicone plate.

[0097] Thus, the silicone sheet has good flexibility and elasticity, and it easily recovers after deformation, which is beneficial for repeated use. Moreover, the silicone sheet is resistant to high temperatures, and laser welding causes less damage to the silicone sheet.

[0098] Example 8

[0099] The welding equipment of this application embodiment is characterized by including the welding press 10 of any one of embodiments one to seven.

[0100] In the welding equipment of this application embodiment, since the filler 12 of the welding press 10 presses the welding strip 30 located above the weld point 22 into the groove 23 so that the welding strip 30 contacts the weld point 22, it can avoid the gap between the welding strip 30 and the weld point 22 caused by the top of the weld point 22 being lower than the top of the insulating layer 21, thus preventing them from making contact. In this way, the welding strip 30 and the weld point 22 can be made in contact, improving the welding defects.

[0101] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0102] Example 9

[0103] In the battery assembly of this application embodiment, during the welding process, the welding press 10 of any one of embodiments one to seven is used to press the welding strip 30 placed on the solar cell 20.

[0104] In the battery assembly of this application embodiment, since the filler 12 of the welding press 10 presses the welding strip 30 located above the solder joint 22 into the groove 23 so that the welding strip 30 contacts the solder joint 22, it can avoid the formation of a gap between the welding strip 30 and the solder joint 22 and the inability to contact due to the top of the solder joint 22 being lower than the top of the insulating layer 21. Thus, the contact between the welding strip 30 and the solder joint 22 can be achieved, improving poor welding.

[0105] The battery module may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film can be filled between the front and back of the solar cell 20, the photovoltaic glass, and adjacent cells. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film can be EVA film or POE film. The specific choice can be made according to the actual situation and is not limited here.

[0106] Photovoltaic glass can be applied to the encapsulating film on the front side of the solar cell 20. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cell 20 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell 20 together, providing sealing, insulation, and waterproofing / moisture protection for the solar cell 20.

[0107] The backsheet can be attached to the encapsulant film on the back of the solar cell 20. The backsheet provides protection and support for the solar cell 20, offering reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite encapsulant film, etc. The specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell 20, encapsulant film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire battery module, providing stable support and installation. For example, the battery module can be installed at the desired location using the metal frame.

[0108] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0109] Example 10

[0110] Please see Figure 2 and Figure 5 The battery assembly welding method of this application embodiment includes:

[0111] Step S11: Provide a plurality of solar cells 20. Each solar cell 20 includes an insulating layer 21 and a plurality of solder joints 22. The insulating layer 21 has a plurality of openings. The solder joints 22 are located in the openings. The top of the solder joints 22 is lower than the top of the insulating layer 21. The solder joints 22 and the insulating layer 21 form a groove 23.

[0112] Step S12: Place solder ribbons 30 on the plurality of solar cells 20, with the solder ribbons 30 positioned above the solder joints 22;

[0113] Step S13: Press the welding strip 30 and the solar cell 20 with the welding press 10. The welding press 10 includes a pressure plate 11 and a filler 12. The filler 12 presses the welding strip 30 into the groove 23 so that the welding strip 30 contacts the welding point 22.

[0114] Step S14: Use a welding machine to weld the welding strip 30 and the welding point 22.

[0115] In the battery assembly welding method of this application embodiment, since the filler 12 of the welding press 10 presses the welding strip 30 located above the welding point 22 into the groove 23 so that the welding strip 30 contacts the welding point 22, it can avoid the gap between the welding strip 30 and the welding point 22 caused by the top of the welding point 22 being lower than the top of the insulating layer 21, thus achieving contact between the welding strip 30 and the welding point 22 and improving welding defects.

[0116] Specifically, in step S11, multiple solar cells 20 can be arranged and placed on a welding platform. The welding platform can be formed with adsorption holes to hold the solar cells 20 in place. This prevents the solar cells 20 from moving, facilitates welding, and helps improve welding accuracy.

[0117] Specifically, in step S12, one solder strip 30 can be placed at a time, multiple solder strips 30 can be placed at a time, or all solder strips 30 can be placed at a time. It can be understood that since the top of the solder joint 22 is lower than the top of the insulating layer 21, there is a gap between the solder strip 30 placed on the insulating layer 21 and the solder joint 22 at the opening.

[0118] Specifically, in step S13, the welding press 10 can be placed on the solar cell 20 on which the solder ribbon 30 is placed, thereby pressing down the solder ribbon 30 and the solar cell 20. Further, the welding press 10 can be placed vertically on the solar cell 20 on which the solder ribbon 30 is placed. Thus, because the placement direction is vertical, it is easier for the filler 12 to press the solder ribbon 30 into the groove 23, which helps to improve the efficiency of placing the welding press 10.

[0119] Specifically, in step S14, multiple welding strips 30 can be heated by at least one of infrared heating, electromagnetic heating, hot air heating, and laser heating to weld the welding strips 30 and the weld points 22. In other words, the welder can operate based on at least one of the principles of infrared heating, electromagnetic heating, hot air heating, and laser heating.

[0120] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0121] Example 11

[0122] Please see Figure 6 In some optional embodiments, the pressure plate 11 is a transparent pressure plate 11, the filler 12 is a transparent filler 12, the welder includes a laser, and step S14 includes:

[0123] Step S141: Using a laser, weld the solder strip 30 and the solder joint 22 through the transparent pressure plate 11 and the transparent filler 12.

[0124] Thus, since both the pressure plate 11 and the filler 12 are transparent, they will not obstruct the weld joint 22, making welding convenient. Moreover, when welding with a laser, the laser can pass through the transparent pressure plate 11 and the filler 12, thereby achieving welding.

[0125] Specifically, the pressure plate 11 is a transparent glass plate. This high transparency and readily available material improve welding quality and reduce costs.

[0126] Specifically, the light transmittance of the pressure plate 11 and the filler 12 can be greater than or equal to 90%. For example, 90%, 92%, 95%, 98%, or 100%. This results in high light transmittance of the pressure plate 11 and the filler 12, thus improving their transparency and facilitating welding.

[0127] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0128] Example 12

[0129] Please see Figure 2 and Figure 7 In some alternative embodiments, the filler 12 includes a protrusion 121 projecting from the pressure plate 11 to one side, and step S13 includes:

[0130] Step S131: Place the pressure plate 11 and the protrusion 121 on the welding strip 30;

[0131] Step S132: Insert the protrusion 121 into the groove 23 and press the solder strip 30 located above the solder joint 22 into the groove 23 to contact the solder joint 22.

[0132] In this way, the welding press 10 presses down the welding strip 30 and the solar cell 20, ensuring that the protrusion 121 extends into the groove 23, thereby ensuring that the welding strip 30 is pressed into the groove 23 and contacts the welding point 22.

[0133] Specifically, before step S131, the protrusion 121 and the groove 23 can be aligned. This way, after placing the pressure plate 11 and the protrusion 121 on the welding strip 30, the protrusion 121 can be directly inserted into the groove 23, resulting in higher efficiency. It is understood that the protrusion 121 and the groove 23 can also be aligned after step S131 and before step S132.

[0134] Specifically, in step S131, the pressure plate 11 and the protrusion 121 can be connected as a single unit, and the pressure plate 11 and the protrusion 121 can be placed together on the welding strip 30. In this way, they can be placed and aligned together, which helps to improve efficiency.

[0135] It is understood that in other embodiments, where the protrusion 121 and the pressure plate 11 are formed separately, the protrusion 121 may be placed on the solder strip 30 first, and then the pressure plate 11 may be placed on the solder strip 30 and the protrusion 121. Furthermore, when placing the protrusion 121 on the solder strip 30, multiple protrusions 121 may be placed on the solder strip 30 one by one, or they may be placed on the solder strip 30 in batches, or all the protrusions 121 corresponding to the pressure plate 11 may be placed on the solder strip 30 together.

[0136] Specifically, in step S132, the protrusion 121 can be inserted into the groove 23 by the weight of the pressure plate 11 and the protrusion 121 itself, or pressure can be applied to the pressure plate 11 to make the protrusion 121 insert into the groove 23. The specific method of inserting the protrusion 121 into the groove 23 is not limited here.

[0137] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0138] Example 13

[0139] Please see Figure 4 and Figure 8 In some alternative embodiments, the filler 12 includes a flexible plate 122 disposed on one side of the pressure plate 11, and step S13 includes:

[0140] Step S133: Place the flexible plate 122 and the pressure plate 11 onto the welding strip 30 in sequence;

[0141] Step S134: Deform the flexible plate 122 and extend it into the groove 23. Press the solder strip 30 located above the solder joint 22 into the groove 23 to contact the solder joint 22.

[0142] In this way, the welding press 10 can press the welding strip 30 and the solar cell 20. Since the shape of the filler 12 is flexible, it can adapt to various shapes of grooves 23 and various positions of grooves 23. It is not necessary to design and manufacture the filler 12 specifically for each type of solar cell 20, nor is it necessary to precisely align each groove 23, which helps to reduce costs and improve efficiency.

[0143] Specifically, before step S133, the pressure plate 11 and flexible plate 122 can be edge-aligned, and then the pressure plate 11 and flexible plate 122 can be placed together on the welding ribbon 30. This prevents the pressure plate 11 and flexible plate 122 from misaligning, thereby preventing damage to the solar cell 20, and also prevents the flexible plate 122 from missing the grooves 23 within the coverage area of ​​the welding fixture 10. Furthermore, placing them together and aligning their edges simultaneously improves efficiency. It is understood that in other embodiments, the flexible plate 122 can be placed on the welding ribbon 30 first, and then the pressure plate 11 can be placed on the welding ribbon 30 and aligned simultaneously.

[0144] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0145] Example 14

[0146] Please see Figure 4 In some alternative embodiments, the welding fixture 10 and the solar cell 20 form a closed space, and step S134 includes:

[0147] A vacuuming device is used to vacuum the enclosed space from the vacuum fitting part of the welding press 10, causing the flexible plate 122 to deform.

[0148] In this way, the flexible plate 122 can be deformed by vacuuming, which is simple and efficient and will not damage the solar cell 20 and the solder ribbon 30.

[0149] Specifically, the welding press 10 includes multiple sidewalls extending from the edge of the pressure plate 11 toward the flexible plate 122. The flexible plate 122 and the multiple sidewalls form a receiving space, and the flexible plate 122, the multiple sidewalls, and the solar cell 20 can form a closed space. In this way, while the welding press 10 presses down on the solar cell 20 and the solder strip 30, it forms a closed space, which facilitates vacuuming. Furthermore, the vacuuming mating part can be located on the sidewall of the welding press 10.

[0150] It is understandable that the solar cell 20 can be placed in the containment space and placed on the welding platform, with the flexible plate 122, multiple side walls, solar cell 20 and welding platform forming a closed space.

[0151] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0152] Example 15

[0153] The battery assembly of this application embodiment is welded using the welding method of any one of embodiments ten to fourteen.

[0154] In the battery assembly of this application embodiment, since the filler 12 of the welding press 10 presses the welding strip 30 located above the solder joint 22 into the groove 23 so that the welding strip 30 contacts the solder joint 22, it can avoid the formation of a gap between the welding strip 30 and the solder joint 22 and the inability to contact due to the top of the solder joint 22 being lower than the top of the insulating layer 21. Thus, the contact between the welding strip 30 and the solder joint 22 can be achieved, improving poor welding.

[0155] The battery module may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film can be filled between the front and back of the solar cell 20, the photovoltaic glass, and adjacent cells. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film can be EVA film or POE film. The specific choice can be made according to the actual situation and is not limited here.

[0156] Photovoltaic glass can be applied to the encapsulating film on the front side of the solar cell 20. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cell 20 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell 20 together, providing sealing, insulation, and waterproofing / moisture protection for the solar cell 20.

[0157] The backsheet can be attached to the encapsulant film on the back of the solar cell 20. The backsheet provides protection and support for the solar cell 20, offering reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite encapsulant film, etc. The specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell 20, encapsulant film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire battery module, providing stable support and installation. For example, the battery module can be installed at the desired location using the metal frame.

[0158] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0159] Example 16

[0160] The photovoltaic system of this application includes the battery module of embodiment nine or embodiment fifteen.

[0161] In the photovoltaic system of this application embodiment, since the filler 12 of the welding press 10 presses the welding strip 30 located above the solder joint 22 into the groove 23 so that the welding strip 30 contacts the solder joint 22, it can avoid the formation of a gap between the welding strip 30 and the solder joint 22 and the inability to contact due to the top of the solder joint 22 being lower than the top of the insulating layer 21. Thus, the contact between the welding strip 30 and the solder joint 22 can be achieved, improving poor welding.

[0162] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0163] Further explanations and descriptions of this embodiment can be found in other parts of this document, and will not be repeated here to avoid redundancy.

[0164] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application. Furthermore, the specific features, structures, materials, or characteristics described in the various embodiments or examples of this application can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A welding press, characterized in that, The welding fixture is used to press down the solder strip placed on a solar cell. The solar cell includes an insulating layer and multiple solder joints. The insulating layer has multiple openings, and the solder joints are located in the openings. The top of the solder joint is lower than the top of the insulating layer, and the solder joint and the insulating layer form a groove. The welding fixture includes a pressure plate and a filler. When the welding fixture presses down the solder strip and the solar cell, the filler presses the solder strip located above the solder joint into the groove, so that the solder strip contacts the solder joint. The filler includes a flexible plate disposed on one side of the pressure plate, the flexible plate being able to cover all the solder joints and corresponding solder strips of the solar cell; When the welding press presses down on the welding strip and the solar cell, the welding press and the solar cell form a closed space. The welding press has a vacuum fitting part, which works with a vacuum pump to perform a vacuuming process on the closed space. After the vacuuming process on the closed space, the flexible plate deforms and presses the welding strip into the groove. Multiple sidewalls extending from the edge of the press plate toward the side of the flexible plate form a receiving space. The flexible plate, the multiple sidewalls, and the solar cell can form the closed space.

2. The welding press according to claim 1, characterized in that, The pressure plate is a transparent pressure plate, and the filler is a transparent filler.

3. The welding press according to claim 1, characterized in that, The flexible plate includes a silicone plate.

4. A welding device, characterized in that, Includes the welding press as described in any one of claims 1-3.

5. A battery assembly, characterized in that, During the welding process, the welding press according to any one of claims 1-3 is used to press the solder strip placed on the solar cell.

6. A method for welding a battery assembly, using the welding fixture according to any one of claims 1-3, characterized in that, include: A plurality of solar cells are provided, each solar cell including an insulating layer and a plurality of solder joints, the insulating layer having a plurality of openings, the solder joints being disposed in the openings, the top of the solder joints being lower than the top of the insulating layer, and the solder joints and the insulating layer forming a groove; A solder strip is placed on one or more of the solar cells, the solder strip being positioned above the solder joint; The welding press is used to press the welding strip and the solar cell. The welding press includes a pressure plate and a filler. The filler presses the welding strip into the groove so that the welding strip contacts the solder joint. The welding strip and the weld point are welded using a welding machine.

7. The welding method for battery components according to claim 6, characterized in that, The pressure plate is a transparent pressure plate, the filler is a transparent filler, and the welder includes a laser. The welder is used to weld the weld strip and the weld point, including: Using a laser, the solder strip and the solder joint are welded through the transparent pressure plate and the transparent filler.

8. The welding method for a battery assembly according to claim 6, characterized in that, The filler includes a flexible plate disposed on one side of the pressure plate, and the welding strip and the solar cell are pressed together by a welding press, including: The flexible plate and the pressure plate are placed sequentially on the welding strip; The flexible plate is deformed and extends into the groove, pressing the welding strip located above the welding point into the groove to contact the welding point.

9. The welding method for a battery assembly according to claim 8, characterized in that, The welding fixture and the solar cell form a closed space, deforming the flexible plate, including: A vacuuming device is used to vacuum the enclosed space from the vacuuming mating part of the welding press, causing the flexible plate to deform.

10. A battery assembly, characterized in that, The battery assembly is welded using the welding method described in any one of claims 6-9.

11. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 5 or claim 10.

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