Photovoltaic module connecting solder strip and fixing method thereof

Abstract

The invention provides a photovoltaic module connecting solder strip and a fixing method thereof. The photovoltaic module connecting solder strip comprises a solder strip body with the cross section of a protruding structure. The number of the protruding structures is N, and N ranges from 3 to 100. The distance difference between the concave part of the protruding structure and the highest point of the protruding structure and the center of the cross section of the welding strip is 0.1-400 [mu] m; and the distance between the highest points of the two adjacent bulges is 0.1-400 microns. The fixing method of the photovoltaic module connecting solder strip is simple to operate, the photovoltaic module connecting solder strip is coated with the conductive adhesive, pressure is applied to the battery piece side from the air side, irradiation crosslinking is carried out, the photovoltaic module connecting solder strip and the battery piece are fixed, the use amount of silver paste is greatly reduced, and the cost is reduced. The production cost is reduced, and the application prospect is wide.

Description

[0001] This application claims the priority of patent application No. 2024101441147 (the filing date of the prior application is February 1, 2024, and the name of the invention is A photovoltaic module connecting welding strip and its fixing method). Technical Field

[0002] The present invention relates to the technical field of photovoltaic modules, and in particular to a photovoltaic module connecting welding strip and a fixing method thereof. Background Art

[0003] At present, photovoltaic module cell series welding uses thermal welding. As the cell becomes thinner and thinner, stress will lead to a high cell fragmentation rate. Now we have entered the era of N-type batteries, especially HJT batteries, which require low-temperature processes and require saving silver paste. As a result, various companies have invented 0BB technology, which achieves the purpose of saving silver paste without a main grid by melting the welding ribbon at a low temperature of 139°C or using a carrier film or using a dispensing film with an integrated film or using a dispensing film + electric welding with an integrated film or using a skin film with a low-temperature welding ribbon + an ordinary packaging film. However, these solutions still have the defect that the welding ribbon itself has no pulling force with the battery, and the conductive glue is not used because of its high cost, and it is also necessary to produce a complex integrated film at a high price.

[0004] CN117038751A discloses a photovoltaic welding strip structure, a main grid-free photovoltaic module and a welding connection method. The welding strip structure includes a circular welding strip arranged on the front side of the battery cell in a direction perpendicular to the fine grid lines of the battery cell, and a flat welding strip located between adjacent circular welding strips for connecting the circular welding strips. The flat welding strip is clamped between adjacent battery cells, and the two sides of the flat welding strip are abutted against the adjacent circular welding strips. The battery cells are assembled and connected by using a single flat welding strip and circular welding, which can reduce the weight of the adhesive film on the back side of the battery cell and achieve assembly with close to zero spacing between the battery cells.

[0005] CN214411227U discloses a photovoltaic module cell sheet connection welding strip, the photovoltaic module cell sheet connection welding strip is composed of a plurality of continuously connected welding units, each welding unit includes a front connection area and a back connection area, wherein the cross section on the front connection area is a triangle, the back connection area is a flat structure with an isosceles trapezoidal cross section, and a transition area is provided between the front connection area and the back connection area. The above method can replace the circular welding strip commonly used on multi-main grid type photovoltaic modules, the contact area of ​​the welding position is large, it is not easy to produce hidden cracks when transitioning from the front to the back, and the reliability is better.

[0006] CN218975463U discloses a segmented photovoltaic welding strip for connecting battery components, including a frame, a side plate and a welding strip, the inner side of the frame is equipped with a side plate, the top and bottom ends of the first connecting block are equipped with connecting strips, and the inside of the welding strip is provided with a reinforcing structure. By installing a first connecting block on one side of the welding strip, the first connecting block and the second connecting block cooperate with each other, the first connection and the second connection are divided by a dividing line, the dividing line is a dotted line, and the connecting strip at the top of the first connecting rod is coated with a self-adhesive, the connecting strip can connect the first connecting block and the second connecting block together, and the first connecting block and the second connecting block can connect multiple welding strips together, because the dividing line is a dotted line, the first connecting block and the second connection can be torn apart, and multiple welding strips can be torn apart for use, so as to achieve a segmented photovoltaic welding strip for connecting battery components, which is convenient for connecting the welding strips.

[0007] However, the connection effect between the above-mentioned photovoltaic module connecting welding ribbon and the battery cell is still poor, and the problem of saving silver paste is not well solved. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides a photovoltaic module connecting welding ribbon and a fixing method thereof. By setting the cross-section of the photovoltaic module connecting welding ribbon to a protrusion structure and then fixing it with a conductive adhesive containing conductive particles, it can not only achieve a firm connection between the photovoltaic module connecting welding ribbon and the battery cell, but also greatly save the amount of silver paste, with low production cost and broad application prospects.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a photovoltaic module connecting welding strip, comprising a welding strip having a protruding structure in cross section; the protruding structures are N in number, N being 3 to 100; the difference in distance between a recessed portion of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 0.1 μm to 400 μm; and the distance between two adjacent highest points of the protrusions is 0.1 μm to 400 μm.

[0011] The photovoltaic module connecting welding strip described in the present invention is a welding strip with a protruding structure in cross section that is drawn from a welding strip with a circular cross section. The photovoltaic module connecting welding strip has multiple protruding structures, and the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 0.1μm to 400μm; the distance between the highest points of two adjacent protrusions is 0.1μm to 400μm, so that when a conductive adhesive is used to fix the photovoltaic module connecting welding strip and the battery cell, the protruding structure can fix the conductive particles in the conductive adhesive well, and then apply pressure from the air side to the battery cell side, the conductive particles deform between the battery cell and the welding strip to generate sufficient resistance, conduct current, and at the same time the conductive adhesive solidifies and fixes the small balls and the welding strip, thereby achieving a firm connection between the photovoltaic module connecting welding strip and the battery cell.

[0012] The protrusion structure described in the present invention has N numbers, where N is 3 to 100, for example, 3, 5, 10, 30, 50, 80, 90 or 100, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0013] The difference in distance between the recessed part of the protrusion structure and the highest point of the protrusion structure and the center of the cross section of the welding strip is 0.1μm to 400μm, for example: it can be 0.1μm, 0.5μm, 10μm, 15μm, 20μm, 50μm, 80μm, 100μm, 300μm or 400μm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0014] The distance between the highest points of two adjacent protrusions is 0.1μm to 400μm, for example, it can be 0.1μm, 0.55μm, 10μm, 60μm, 90μm, 100μm, 127μm, 200μm, 300μm or 400μm, etc., but it is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0015] Preferably, there are N protrusion structures, where N is 3 to 10, for example, 3, 4, 5, 6, 7, 8, 9 or 10, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] The difference in distance between the recessed part of the protrusion structure and the highest point of the protrusion structure and the center of the cross section of the welding strip is 10 to 200 μm, for example, it can be 10 μm, 20 μm, 50 μm, 100 μm, 150 μm or 200 μm, etc., but is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0017] The distance between the highest points of two adjacent protrusions is 10 to 200 μm, for example, it can be 10 μm, 20 μm, 50 μm, 100 μm, 150 μm or 200 μm, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] Preferably, the diameter of the welding ribbon for the photovoltaic module is 0.01-1 mm, for example, it can be 0.01 mm, 0.05 mm, 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm or 1 mm, but it is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, preferably 0.1-0.3 mm.

[0019] In a second aspect, the present invention further provides a method for fixing the photovoltaic module connecting ribbon as described in the first aspect, the fixing method comprising: applying a conductive adhesive to the photovoltaic module connecting ribbon, applying a certain pressure from the air side to the battery cell side, and the pressure range is 0.1 to 10 kg / cm 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0020] The pre-crosslinking includes any one of electron irradiation crosslinking, ion irradiation crosslinking, atomic irradiation crosslinking, neutron irradiation crosslinking, thermal irradiation crosslinking, thermal conduction crosslinking or electromagnetic irradiation crosslinking; the pre-crosslinking voltage is 250-400 kV; the pre-crosslinking dose is 10-60 KGY; the pre-crosslinking temperature is 100-180° C.; the pre-crosslinking time is 0.1-2 s.

[0021] The method for fixing the photovoltaic module connecting welding strip of the present invention uses a conductive adhesive including an adhesive and conductive particles with a metal coating to fix the photovoltaic module connecting welding strip and the battery cell. The obtained fixed component has good conductivity and high bonding strength, and the amount of silver paste used is greatly reduced, the production cost is low, and it has a prospect for large-scale promotion and application.

[0022] The pressure range of the present invention is 0.1-10 kg / cm 2 , for example, it can be 0.1kg / cm 2 , 0.3kg / cm 2 , 0.5kg / cm 2 , 1kg / cm 2 , 3kg / cm 2 , 5kg / cm 2 , 8kg / cm 2 or 10kg / cm 2 The above range is not limited to the listed values, and other values ​​not listed within the above range are also applicable.

[0023] The preferred pressure range of the present invention is 0.1 to 10 kg / cm 2 , which can make the small ball deform between the battery cell and the solder strip to produce enough resistance to conduct current. At the same time, the colloid solidifies and fixes the small ball and the solder strip, so that the deformed small ball has a certain internal resistance in the conductive channel and conducts electricity stably. When the pressure is low, the conductive particles cannot be attached to the battery cell, and the conductive efficiency is low; when the pressure is high, the conductive particles will break and the conductive efficiency will be low.

[0024] The pre-crosslinking voltage is 250-400 kV, for example, 250 kV, 260 kV, 300 kV, 320 kV, 350 kV, 370 kV or 400 kV, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0025] The pre-crosslinking dosage is 10-60 KGY, for example, 10 KGY, 15 KGY, 20 KGY, 30 KGY, 40 KGY, 45 KGY, 50 KGY or 60 KGY, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0026] The pre-crosslinking temperature is 100-180°C, for example, 100°C, 110°C, 120°C, 150°C, 160°C, 170°C or 180°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] The pre-crosslinking time is 0.1 to 2 seconds, for example, 0.1 seconds, 0.3 seconds, 0.5 seconds, 0.8 seconds, 1 seconds, 1.5 seconds, 1.7 seconds or 2 seconds, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0028] Preferably, the pre-crosslinking temperature is 120-150°C, for example, it can be 120°C, 125°C, 130°C, 135°C, 140°C, 145°C or 150°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] Preferably, the pre-crosslinking time is 0.5 to 0.8 s, for example, 0.5 s, 0.55 s, 0.6 s, 0.65 s, 0.7 s, 0.75 s, 0.78 s or 0.8 s, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0030] Preferably, the adhesive consists of a base resin and a curing agent.

[0031] Preferably, the curing agent accounts for 1 to 20% of the mass of the adhesive, for example, it can be 1%, 3%, 5%, 10%, 12%, 15%, 18% or 20%, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0032] Preferably, the matrix resin comprises liquid glue or hot melt glue.

[0033] Preferably, the liquid glue comprises any one of epoxy resin, unsaturated polyester resin, acrylic resin, silicone resin, polyurethane resin, phenoxy resin or alkyd resin, or a combination of at least two of them, wherein typical but non-limiting combinations include a combination of epoxy resin and unsaturated polyester resin, a combination of acrylic resin and silicone resin, a combination of polyurethane resin and phenoxy resin, or a combination of alkyd resin and epoxy resin.

[0034] Preferably, the hot melt temperature of the hot melt adhesive is 80-200° C., for example, 80° C., 100° C., 110° C., 120° C., 150° C., 160° C., 180° C. or 200° C., etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0035] The long-term operating temperature index is above 60°C, for example, it can be 60°C, 80°C, 105°C, 110°C, 120°C, 150°C, 160°C, 170°C or 180°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0036] Preferably, the curing agent includes any one of a latent curing agent, an isocyanate curing agent, a thermal alkaline curing agent, a thermal acidic curing agent or a photoinitiator, or a combination of at least two of them, wherein typical but non-limiting combinations include a combination of a latent curing agent and an isocyanate curing agent, a combination of a thermal alkaline curing agent and a thermal acidic curing agent, or a combination of a photoinitiator and a thermal alkaline curing agent.

[0037] Preferably, the latent curing agent includes any one of a latent anionic polymerization catalytic curing agent, a latent cationic polymerization catalytic curing agent or a latent addition polymerization curing agent, or a combination of at least two of them, wherein typical but non-limiting combinations include a combination of a latent anionic polymerization catalytic curing agent and a latent cationic polymerization catalytic curing agent, a combination of a latent addition polymerization curing agent and a latent anionic polymerization catalytic curing agent, or a combination of a latent cationic polymerization catalytic curing agent and a latent addition polymerization curing agent.

[0038] Preferably, the latent curing agent includes any one of a coated amine curing agent, a coated urea curing agent, an anhydride curing agent, a phenolic curing agent, a polythiol curing agent, an anionic polymerizing curing agent or a cationic polymerizing curing agent, or a combination of at least two of them, wherein typical but non-limiting combinations include a combination of a coated amine curing agent and a coated urea curing agent, a combination of an anhydride curing agent and a phenolic curing agent, a combination of a polythiol curing agent and an anionic polymerizing curing agent, or a combination of a cationic polymerizing curing agent and a coated amine curing agent.

[0039] Preferably, the latent cationic polymerization catalytic curing agent includes any one of boron trifluoride amine complex, polythiol aryl diazonium salt, diaryl iodonium salt, triaryl sulfonium salt, triaryl selenium salt and iron-arene complex or amine-blocked Lewis acid salt, or a combination of at least two thereof, wherein typical but non-limiting combinations include a combination of boron trifluoride amine complex and polythiol aryl diazonium salt, a combination of diaryl iodonium salt and triaryl sulfonium salt, a combination of triaryl selenium salt and iron-arene complex and amine-blocked Lewis acid salt, or a combination of polythiol aryl diazonium salt and triaryl sulfonium salt.

[0040] Preferably, the thermal initiation temperature of the latent cationic polymerization catalytic curing agent is 80-200°C, for example, it can be 80°C, 110°C, 120°C, 150°C, 160°C, 180°C or 200°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0041] Preferably, the photosensitizer has a photosensitivity wavelength of 250 nm to 500 nm, for example, 250 nm, 260 nm, 300 nm, 320 nm, 350 nm, 400 nm, 450 nm or 500 nm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0042] Preferably, the photoinitiator includes benzoin and its derivatives photoinitiator, benzil and its derivatives photoinitiator, acetophenone derivatives photoinitiator, α-hydroxyketone derivatives photoinitiator, α-aminoketone derivatives photoinitiator, acylphosphine oxide photoinitiator, sulfur-containing photoinitiator, benzophenone and its derivatives photoinitiator, thioxanthone and its derivatives photoinitiator, anthraquinone and its derivatives photoinitiator, aryldiazonium salt photoinitiator, diaryliodonium salt photoinitiator, triarylsulfonium salt photoinitiator, arylferrocenium salt photoinitiator, camphorquinone photoinitiator or titanocene photoinitiator. The photoinitiator may be a photoinitiator selected from the group consisting of any one or a combination of at least two of the photoinitiators, wherein typical but non-limiting combinations include a combination of benzoin and its derivatives photoinitiators and benzil and its derivatives photoinitiators, a combination of acetophenone derivatives photoinitiators and α-hydroxyketone derivatives photoinitiators, a combination of α-aminoketone derivatives photoinitiators and acylphosphine oxide photoinitiators, a combination of sulfur-containing photoinitiators and benzophenone and its derivatives photoinitiators, a combination of thioxanthone and its derivatives photoinitiators and anthraquinone and its derivatives photoinitiators, or a combination of aryldiazonium salt photoinitiators and diaryliodonium salt photoinitiators.

[0043] Preferably, the conductive particles account for 1 to 30% of the volume of the conductive adhesive, for example, 1%, 5%, 8%, 10%, 13%, 20%, 25%, 38% or 30%, etc., but are not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0044] Preferably, the conductive particles include small balls with a metal coating.

[0045] The small ball with metal coating described in the present invention can be a hollow small ball or a solid small ball.

[0046] Preferably, the metal plating layer includes any one of an iron layer, a nickel layer, a copper layer, a zinc layer, an aluminum layer, a silver layer or a gold layer, or a combination of at least two of them, wherein typical but non-limiting combinations include a combination of a nickel layer and a gold layer, a combination of a silver layer and a nickel layer, or a combination of a copper layer and a nickel layer. These plating layers have very low ductility and activity and will not chemically react with other materials.

[0047] Preferably, the total thickness of the metal coating is 0.001 to 0.1 μm, for example, it can be 0.001 μm, 0.01 μm, 0.03 μm, 0.05 μm, 0.07 μm, 0.09 μm or 0.1 μm, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable, preferably 0.03 to 0.06 μm.

[0048] Preferably, the thickness ratio of the nickel layer and the gold layer is (2-10):1, for example, it can be 2:1, 3:1, 5:1, 7:1, 7.5:1, 8:1, 9:1 or 10:1, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0049] Preferably, the diameter of the spheres is 1 to 200 μm, for example, 1 μm, 3 μm, 5 μm, 8 μm, 9 μm, 10 μm, 50 μm, 100 μm or 200 μm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable, preferably 5 to 150 μm.

[0050] Preferably, the material of the ball includes any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate, silicone, glass, nylon, polyimide, fluorine-containing resin, EVA, POE, ABS plastic or EBA plastic.

[0051] As a preferred technical solution of the present invention, the fixing method includes:

[0052] Apply conductive adhesive to the photovoltaic module connection ribbon and apply a certain pressure from the air side to the cell side. The pressure range is 0.1-10kg / cm 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0053] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 1 to 20% of the mass of the adhesive; the base resin includes liquid glue or hot melt glue; the liquid glue includes any one of epoxy resin, unsaturated polyester resin, acrylic resin, silicone resin, polyurethane resin, phenoxy resin or alkyd resin or a combination of at least two; the hot melt temperature of the hot melt glue is 80 to 200°C, and the long-term working temperature index is above 60°C;

[0054] The curing agent includes any one of a latent curing agent, an isocyanate curing agent, a thermal alkaline curing agent, a thermal acidic curing agent or a photoinitiator, or a combination of at least two thereof; the photosensitive wavelength of the photoinitiator is 250nm to 500nm;

[0055] The conductive particles account for 1 to 30% of the volume of the conductive adhesive; the conductive particles include small balls with metal coatings; the metal coatings include any one of an iron layer, a nickel layer, a copper layer, a zinc layer, an aluminum layer, a silver layer or a gold layer, or a combination of at least two of them; the total thickness of the metal coating is 0.001 to 0.1 μm; the thickness ratio of the nickel layer to the gold layer is (2 to 10): 1; the diameter of the small balls is 1 to 200 μm; the material of the small balls includes any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate, silicone, glass, nylon, polyimide, fluorine-containing resin, EVA, POE, ABS plastic or EBA plastic;

[0056] The pre-crosslinking includes any one of electron irradiation crosslinking, ion irradiation crosslinking, atomic irradiation crosslinking, neutron irradiation crosslinking, thermal irradiation crosslinking, thermal conduction crosslinking or electromagnetic irradiation crosslinking; the pre-crosslinking voltage is 250-400 kV; the pre-crosslinking dose is 10-60 KGY; the pre-crosslinking temperature is 100-180° C.; the pre-crosslinking time is 0.1-2 s.

[0057] In a third aspect, the present invention further provides a use of a fixing assembly of photovoltaic module connecting welding strips and battery cells obtained by the method for fixing photovoltaic module connecting welding strips as described in the second aspect, wherein the fixing assembly is used for BC modules, perovskite modules, HJT modules without main grid, or TOPCon modules without main grid.

[0058] Compared with the prior art, the present invention has at least the following beneficial effects:

[0059] (1) The cross-section of a photovoltaic module connecting welding strip provided by the present invention has a protrusion structure, which can fix the conductive particles in the conductive adhesive. When the photovoltaic module connecting welding strip is fixed by the conductive adhesive, the conductive particles are deformed between the battery cell and the welding strip to generate sufficient resistance to conduct current. At the same time, the conductive adhesive is cured to fix the small balls and the welding strip, so that the deformed conductive particles have a certain internal resistance in the conductive channel, thereby achieving stable conduction.

[0060] (2) The method for fixing the photovoltaic module connecting welding ribbon provided by the present invention not only realizes the effective fixation of the photovoltaic module connecting welding ribbon and the battery cell, but also greatly reduces the amount of silver paste used, and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the fixing structure of the photovoltaic module connecting the welding strip and the battery cell in Example 1 of the present invention.

[0062] In the figure: 1-adhesive; 2-conductive particles; 3-photovoltaic module connecting ribbon; 4-cell. DETAILED DESCRIPTION

[0063] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0064] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0065] Example 1

[0066] This embodiment provides a photovoltaic module connecting welding strip, and the fixing structure diagram of the photovoltaic module connecting welding strip and the battery sheet is as follows Figure 1 shown.

[0067] The photovoltaic module connecting welding strip 3 is a welding strip with a protruding structure in cross section; there are N protruding structures, N is 6; the difference in distance between the concave part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 10μm; the distance between the highest points of two adjacent protrusions is 20μm.

[0068] The diameter of the photovoltaic module welding ribbon 3 is 0.2 mm.

[0069] This embodiment also provides a method for fixing the photovoltaic module connecting welding strip 3, and the fixing method includes:

[0070] Apply conductive adhesive to the photovoltaic module connection welding strip 3 and apply a pressure of 3kg / cm from the air side to the battery side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection welding ribbon 3 and the battery cell 4; the conductive adhesive comprises an adhesive 1 and conductive particles 2;

[0071] The adhesive 1 is composed of a matrix resin epoxy resin Shinnippon Steel & Sumikin Chemical YP-50 and a curing agent; the curing agent accounts for 10% of the mass of the adhesive; the curing agent is a latent curing agent Ajinomoto PN50;

[0072] The conductive particles 2 account for 10% of the volume of the conductive adhesive; the conductive particles 2 include hollow spheres with a nickel layer; the total thickness of the nickel layer is 0.05 μm; the diameter of the hollow spheres is 5 μm; the material of the hollow spheres is polyethylene;

[0073] The pre-crosslinking is electron irradiation crosslinking; the pre-crosslinking voltage is 300 kV; the pre-crosslinking dose is 40 KGY; the pre-crosslinking temperature is 130° C.; and the pre-crosslinking time is 0.7 s.

[0074] Example 2

[0075] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 8; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 0.1 μm; the distance between the highest points of two adjacent protrusions is 10 μm.

[0076] The diameter of the photovoltaic module connecting welding strip is 0.3 mm.

[0077] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0078] Apply conductive adhesive to the photovoltaic module connection ribbon and apply a pressure of 1kg / cm2 from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0079] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 2% of the mass of the adhesive; the base resin is an unsaturated polyester resin, which is the unsaturated polyester resin described in Preparation Example 1 in CN202310080824.3; the curing agent is a thermal alkaline curing agent QNP1-4085;

[0080] The conductive particles account for 5% of the volume of the conductive adhesive; the conductive particles are solid spheres with a silver layer; the total thickness of the silver layer is 0.01 μm; the diameter of the solid spheres is 70 μm; the material of the solid spheres is polypropylene;

[0081] The pre-crosslinking is ion irradiation crosslinking; the pre-crosslinking voltage is 270 kV; the pre-crosslinking dose is 40 KGY; the pre-crosslinking temperature is 110° C.; and the pre-crosslinking time is 0.2 s.

[0082] Example 3

[0083] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 15; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 400μm; the distance between the highest points of two adjacent protrusions is 5μm.

[0084] The diameter of the photovoltaic module connecting welding strip is 0.01 mm.

[0085] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0086] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 0.1kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0087] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 1% of the mass of the adhesive; the base resin is acrylic resin 73332-S-60 (Changxing Chemical); the curing agent is the same as that in Example 1.

[0088] The conductive particles account for 5% of the volume of the conductive adhesive; the conductive particles are hollow spheres having a nickel layer and a gold layer arranged in sequence; the total thickness of the nickel layer and the gold layer arranged in sequence is 0.1 μm; the thickness ratio of the nickel layer to the gold layer is 2:1; the diameter of the hollow sphere is 150 μm; the material of the hollow sphere is polystyrene;

[0089] The pre-crosslinking is electromagnetic radiation crosslinking; the pre-crosslinking voltage is 400kV; the pre-crosslinking dose is 10KGY; the pre-crosslinking temperature is 180°C; and the pre-crosslinking time is 2s.

[0090] Example 4

[0091] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 10; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 30 μm; the distance between two adjacent protrusion highest points is 0.1 μm.

[0092] The diameter of the photovoltaic module connecting welding strip is 0.3 mm.

[0093] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0094] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 10kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0095] The adhesive is composed of a base resin and a curing agent; the base resin is the same as that in Example 1, and the curing agent accounts for 20% of the mass of the adhesive;

[0096] The curing agent is a triarylsulfonium salt;

[0097] The conductive particles account for 30% of the volume of the conductive adhesive; the conductive particles are hollow spheres with a nickel layer; the total thickness of the nickel layer is 0.001 μm; the diameter of the hollow spheres is 10 μm; the material of the hollow spheres is polyethylene terephthalate;

[0098] The pre-crosslinking is heat conduction radiation crosslinking; the pre-crosslinking voltage is 250 kV; the pre-crosslinking dose is 60 KGY; the pre-crosslinking temperature is 100° C.; and the pre-crosslinking time is 0.1 s.

[0099] Example 5

[0100] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 20; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the cross section of the welding strip is 6.6μm; the distance between the highest points of two adjacent protrusions is 400μm.

[0101] The diameter of the photovoltaic module connecting welding strip is 0.017 mm.

[0102] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0103] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 3.4kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0104] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 6.1% of the mass of the adhesive; the base resin is an alkyd resin;

[0105] The curing agent is a phenolic curing agent;

[0106] The conductive particles account for 11.5% of the volume of the conductive adhesive; the conductive particles are solid small balls with a nickel layer and a gold layer arranged in sequence; the total thickness of the nickel layer and the gold layer arranged in sequence is 0.03 μm; the thickness ratio of the nickel layer to the gold layer is 4.3:1; the diameter of the solid small ball is 200 μm; the material of the solid small ball is EBA plastic;

[0107] The pre-crosslinking is atomic irradiation crosslinking; the pre-crosslinking voltage is 276 kV; the pre-crosslinking dose is 41 KGY; the pre-crosslinking temperature is 136° C.; and the pre-crosslinking time is 1.7 s.

[0108] Example 6

[0109] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 35; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 23 μm; the distance between the highest points of two adjacent protrusions is 18 μm.

[0110] The diameter of the photovoltaic module connecting welding strip is 0.19 mm.

[0111] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0112] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 7.6kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0113] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 14% of the mass of the adhesive; the base resin is an organic silicon resin;

[0114] The curing agent is a photoinitiator; the photosensitivity wavelength of the photoinitiator is 500nm; the photoinitiator is an acylphosphine oxide photoinitiator;

[0115] The conductive particles account for 11% of the volume of the conductive adhesive; the conductive particles are hollow spheres with a nickel layer; the total thickness of the nickel layer is 0.1 μm; the diameter of the hollow spheres is 7 μm; the hollow spheres are made of silicone;

[0116] The pre-crosslinking is neutron irradiation crosslinking; the pre-crosslinking voltage is 330 kV; the pre-crosslinking dose is 49 KGY; the pre-crosslinking temperature is 113° C.; and the pre-crosslinking time is 1.7 s.

[0117] Example 7

[0118] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 40; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 13 μm; the distance between the highest points of two adjacent protrusions is 10 μm.

[0119] The diameter of the photovoltaic module connecting welding strip is 0.03 mm.

[0120] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0121] Apply conductive adhesive to the photovoltaic module connection ribbon and apply a pressure of 4kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0122] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 18% of the mass of the adhesive; the base resin is a hot melt adhesive; the hot melt temperature of the hot melt adhesive is 200°C, and the long-term working temperature index is above 60°C; the curing agent is a boron trifluoride amine complex;

[0123] The conductive particles account for 15% of the volume of the conductive adhesive; the conductive particles are hollow spheres with a silver layer; the total thickness of the silver layer is 0.06 μm; the diameter of the hollow spheres is 7 μm; the material of the hollow spheres is polyethylene terephthalate;

[0124] The pre-crosslinking is thermal radiation crosslinking; the pre-crosslinking voltage is 370 kV; the pre-crosslinking dose is 10 KGY; the pre-crosslinking temperature is 150° C.; and the pre-crosslinking time is 1.2 s.

[0125] Example 8

[0126] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, N is 50; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 17 μm; the distance between the highest points of two adjacent protrusions is 10 μm.

[0127] The diameter of the photovoltaic module connecting welding strip is 0.23 mm.

[0128] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0129] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 7kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0130] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 16% of the mass of the adhesive; the base resin is a polyurethane resin;

[0131] The curing agent is a coated urea curing agent;

[0132] The conductive particles account for 5.5% of the volume of the conductive adhesive; the conductive particles are solid spheres with a nickel layer; the total thickness of the nickel layer is 0.08 μm; the diameter of the solid spheres is 170 μm; the material of the solid spheres is EVA;

[0133] The pre-crosslinking is electromagnetic radiation crosslinking; the pre-crosslinking voltage is 280 kV; the pre-crosslinking dose is 60 KGY; the pre-crosslinking temperature is 50° C.; and the pre-crosslinking time is 2 s.

[0134] Example 9

[0135] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, N is 70; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 28μm; the distance between the highest points of two adjacent protrusions is 10μm.

[0136] The diameter of the photovoltaic module connecting welding strip is 0.53 mm.

[0137] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0138] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 5kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0139] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 12% of the mass of the adhesive; the base resin is an alkyd resin;

[0140] The curing agent is a photoinitiator; the photosensitivity wavelength of the photoinitiator is 300nm; the photoinitiator is a sulfur-containing photoinitiator;

[0141] The conductive particles account for 12.5% ​​of the volume of the conductive adhesive; the conductive particles are hollow spheres with a silver layer; the total thickness of the silver layer is 0.05 μm; the diameter of the hollow spheres is 1.7 μm; the material of the hollow spheres is POE;

[0142] The pre-crosslinking is atomic crosslinking; the pre-crosslinking voltage is 290 kV; the pre-crosslinking dosage is 20 KGY; the pre-crosslinking temperature is 130° C.; and the pre-crosslinking time is 0.6 s.

[0143] Example 10

[0144] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, where N is 100; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 11 μm; the distance between the highest points of two adjacent protrusions is 6 μm.

[0145] The diameter of the photovoltaic module connecting welding strip is 0.6 mm.

[0146] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0147] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 3kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0148] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 2.5% of the mass of the adhesive; the base resin is an unsaturated polyester resin, which is the unsaturated polyester resin described in Preparation Example 1 in CN202310080824.3; the curing agent is a boron trifluoride amine complex;

[0149] The conductive particles account for 11.5% of the volume of the conductive adhesive; the conductive particles are hollow spheres with a nickel layer; the total thickness of the nickel layer is 0.03 μm; the diameter of the hollow spheres is 3.7 μm; the material of the hollow spheres is ABS plastic;

[0150] The pre-crosslinking is electron irradiation crosslinking; the pre-crosslinking voltage is 310 kV; the pre-crosslinking dose is 30 KGY; the pre-crosslinking temperature is 180° C.; and the pre-crosslinking time is 0.29 s.

[0151] Embodiment 11

[0152] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 8; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 16 μm; the distance between two adjacent protrusion highest points is 8 μm.

[0153] The diameter of the photovoltaic module connecting welding strip is 0.8 mm.

[0154] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0155] Apply conductive adhesive to the photovoltaic module connection ribbon and apply a pressure of 1.1kg / cm2 from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0156] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 1.2% of the mass of the adhesive; the base resin is an organic silicon resin;

[0157] The curing agent is a triaryl selenium salt and an iron-arene complex;

[0158] The conductive particles account for 13.5% of the volume of the conductive adhesive; the conductive particles are solid small balls with a metal coating; the metal coating is an iron layer; the total thickness of the metal coating is 0.1 μm; the diameter of the solid small balls is 5.7 μm; the material of the solid small balls is EBA plastic;

[0159] The pre-crosslinking is neutron crosslinking; the pre-crosslinking voltage is 330 kV; the pre-crosslinking dosage is 48 KGY; the pre-crosslinking temperature is 160° C.; and the pre-crosslinking time is 0.26 s.

[0160] Example 12

[0161] The present embodiment provides a photovoltaic module connecting welding strip, which includes a welding strip with a protruding structure in cross section; there are N protruding structures, and N is 8; the difference in distance between the recessed part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 6μm; the distance between the highest points of two adjacent protrusions is 47μm.

[0162] The diameter of the photovoltaic module connecting welding strip is 1 mm.

[0163] This embodiment also provides a method for fixing the above-mentioned photovoltaic module connection welding strip, and the fixing method includes:

[0164] Apply conductive adhesive to the photovoltaic module connection ribbon and apply pressure of 10kg / cm from the air side to the cell side. 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles;

[0165] The adhesive is composed of a base resin and a curing agent; the curing agent accounts for 20% of the mass of the adhesive; the base resin is a phenoxy resin;

[0166] The curing agent is an anionic polymerizing curing agent;

[0167] The conductive particles account for 19% of the volume of the conductive adhesive; the conductive particles are hollow spheres with a metal coating; the metal coating is a zinc layer; the total thickness of the metal coating is 0.01 μm; the diameter of the hollow sphere is 7.7 μm; the material of the hollow sphere is polystyrene;

[0168] The pre-crosslinking is ion irradiation crosslinking; the pre-crosslinking voltage is 390 kV; the pre-crosslinking dose is 45 KGY; the pre-crosslinking temperature is 130° C.; and the pre-crosslinking time is 0.5 s.

[0169] Comparative Example 1

[0170] This comparative example provides a photovoltaic module connecting welding strip, the cross-section of the photovoltaic module connecting welding strip is circular, and has no protrusion structure. The rest is the same as Example 1.

[0171] This comparative example also provides a method for fixing the above photovoltaic module connection welding strip, and the fixing method includes:

[0172] After the connection is made by dispensing silver paste, heat curing is performed to complete the fixation.

[0173] Comparative Example 2

[0174] This comparative example provides a photovoltaic module connecting welding strip, which is the same as Example 1 except that the difference in distance between the concave part of the protrusion structure and the highest point of the protrusion structure and the center of the welding strip cross section is 0.01 μm.

[0175] Comparative Example 3

[0176] This comparative example provides a photovoltaic module connecting welding strip, which is the same as Example 1 except that the difference in distance between the concave part of the protrusion structure and the highest point of the protrusion structure and the center of the welding strip cross section is 433 μm.

[0177] Comparative Example 4

[0178] This comparative example provides a method for fixing a photovoltaic module connecting welding strip. In addition to applying a pressure of 0.01 kg / cm2 from the air side to the battery cell side, the fixing method 2 Except for this, the rest are the same as in Example 1.

[0179] Comparative Example 5

[0180] This comparative example provides a method for fixing a photovoltaic module connecting welding strip. In addition to applying a pressure of 13kg / cm2 from the air side to the battery cell side, the fixing method 2 Except for this, the rest are the same as in Example 1.

[0181] The amount of silver (nickel / gold), resistance, bonding strength, and post-DH2000 attenuation of the photovoltaic module connection ribbon and battery cell fixing products obtained in the above embodiments and comparative examples were tested. The results are shown in Table 1.

[0182] The test method is:

[0183] (1) Conductivity test

[0184] After curing is completed, use a microresistance meter to test the resistance value of two adjacent main grids.

[0185] (2) Bond strength measurement (N / 1.5mm):

[0186] Prepare a cell that has been hot-pressed at 180°C, 2MPa, and 10s, bend the end of the solder strip 180°, fix it on the fixture of the tensile machine, and stretch it 180° at a tensile speed of 30mm / s to measure the peel strength. At this time, if the peel force is ≥0.3N / 1.5mm, it means that the test has passed.

[0187] (3) Component end aging test

[0188] Component manufacturing method: Use automatic pressing equipment to make a 2*3 combination of 6 battery cells, and use EVA, glass, and backplane to encapsulate and laminate them into components; test the contact resistance of the 2*3 component, where DH1000, DH2000, and DH3000 refer to the test end resistance after being placed at 85°C and 85% relative humidity for 1000 hours, 2000 hours, and 3000 hours, respectively, and calculate the relative increase in resistance; refer to IEC61215 standard for details.

[0189] Table 1

[0190]

[0191]

[0192] "(X)" in Table 1 indicates that the effect is not good and does not meet customer requirements.

[0193] From Table 1 we can see that:

[0194] (1) Based on Examples 1 to 12, it can be seen that the amount of silver (nickel / gold) used in the photovoltaic module connection welding ribbon provided by the present invention is less than 2.2 mg / W, the resistance is less than 40 mΩ, the bonding strength is high, and the attenuation after DH2000 is small, and the application range is wide;

[0195] (2) It can be seen from the comprehensive comparison between Example 1 and Comparative Example 1 that the resistance difference between Example 1 and Comparative Example 1 is small, and Example 1 saves more than 70% of silver and can maintain similar conductivity and aging resistance as Comparative Example 1;

[0196] (3) It can be seen from Example 1 and Comparative Examples 2 to 5 that if the protrusion of the welding strip is too large or too small, it will obviously affect the conductive performance. In Comparative Example 4, the pressure is insufficient, and the conductive balls cannot fill the gaps, which affects the conductive performance. In Comparative Example 5, the pressure is too high, which causes the balls to rupture and seriously affects the conductive performance.

[0197] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A photovoltaic module connecting ribbon, characterized in that: The photovoltaic module connecting welding strip includes a welding strip with a protruding structure in cross section; there are N protruding structures, N is 3 to 100; the difference in distance between the concave part of the protruding structure and the highest point of the protruding structure and the center of the welding strip cross section is 0.1μm to 400μm; the distance between the highest points of two adjacent protrusions is 0.1μm to 400μm.

2. The photovoltaic module connecting ribbon according to claim 1, characterized in that: There are N protrusion structures, N is 3-10; the difference in distance between the concave part of the protrusion structure and the highest point of the protrusion structure and the center of the cross section of the welding strip is 10-200 μm; the distance between the highest points of two adjacent protrusions is 10-200 μm.

3. The photovoltaic module connecting welding strip according to claim 1 or 2, characterized in that: The diameter of the photovoltaic module connecting welding strip is 0.01-1 mm, preferably 0.1-0.3 mm.

4. A method for fixing a photovoltaic module connecting welding strip according to any one of claims 1 to 3, characterized in that: The fixing method comprises: coating and wrapping the conductive adhesive on the photovoltaic module connection welding strip, applying a certain pressure from the air side to the battery side, and the pressure range is 0.1-10kg / cm 2 , and pre-crosslinking is performed to achieve the fixation of the photovoltaic module connection ribbon and the battery sheet; the conductive adhesive comprises an adhesive and conductive particles; The pre-crosslinking includes any one of irradiation electron crosslinking, ion irradiation crosslinking, atomic irradiation crosslinking, neutron irradiation crosslinking, thermal irradiation crosslinking, thermal conduction crosslinking or electromagnetic irradiation crosslinking; the pre-crosslinking voltage is 250-400 kV; the pre-crosslinking dose is 10-60 KGY; the pre-crosslinking temperature is 50-180° C.; the pre-crosslinking time is 0.1-2 s.

5. The fixing method according to claim 4, characterized in that: The pre-crosslinking temperature is 120-150°C; Preferably, the pre-crosslinking time is 0.5 to 0.8 s; Preferably, the adhesive is composed of a base resin and a curing agent; Preferably, the curing agent accounts for 1 to 20% of the mass of the binder; Preferably, the matrix resin comprises liquid glue or hot melt glue; Preferably, the liquid glue comprises any one of epoxy resin, unsaturated polyester resin, acrylic resin, silicone resin, polyurethane resin, phenoxy resin or alkyd resin, or a combination of at least two thereof; Preferably, the hot melt temperature of the hot melt adhesive is 80-200° C., and the long-term working temperature index is above 60° C.

6. The fixing method according to claim 5, characterized in that: The curing agent includes any one of a latent curing agent, an isocyanate curing agent, a thermal alkaline curing agent, a thermal acidic curing agent or a photoinitiator, or a combination of at least two of them.

7. The fixing method according to claim 6, characterized in that: The latent curing agent includes any one of a latent anionic polymerization catalytic curing agent, a latent cationic polymerization catalytic curing agent or a latent addition polymerization curing agent, or a combination of at least two thereof; Preferably, the latent curing agent includes any one or a combination of at least two of a coated amine curing agent, a coated urea curing agent, an anhydride curing agent, a phenolic curing agent, a polythiol curing agent, an anionic polymerizing curing agent or a cationic polymerizing curing agent; Preferably, the latent cationic polymerization catalytic curing agent includes any one or a combination of at least two of boron trifluoride amine complex, polythiol aromatic diazonium salt, diaryl iodonium salt, triaryl sulfonium salt, triaryl selenium salt and iron-arene complex or amine-blocked Lewis acid salt; Preferably, the thermal initiation temperature of the latent cationic polymerization catalytic curing agent is 80-200°C.

8. The fixing method according to claim 6, characterized in that: The photosensitive wavelength of the photoinitiator is 250nm to 500nm; Preferably, the photoinitiator includes any one of benzoin and its derivatives photoinitiators, benzil and its derivatives photoinitiators, acetophenone derivatives photoinitiators, α-hydroxyketone derivatives photoinitiators, α-aminoketone derivatives photoinitiators, acylphosphine oxide photoinitiators, sulfur-containing photoinitiators, benzophenone and its derivatives photoinitiators, thioxanthone and its derivatives photoinitiators, anthraquinone and its derivatives photoinitiators, aromatic diazonium salt photoinitiators, diaryl iodonium salt photoinitiators, triaryl sulfonium salt photoinitiators, aromatic ferrocenium salt photoinitiators, camphorquinone photoinitiators or titanocenium photoinitiators, or a combination of at least two thereof.

9. The fixing method according to any one of claims 4 to 8, characterized in that: The conductive particles account for 1 to 30% of the volume of the conductive adhesive; Preferably, the conductive particles include small balls with metal coating; Preferably, the metal plating layer includes any one of an iron layer, a nickel layer, a copper layer, a zinc layer, an aluminum layer, a silver layer or a gold layer, or a combination of at least two thereof; Preferably, the total thickness of the metal coating is 0.001 to 0.1 μm, preferably 0.03 to 0.06 μm; Preferably, the thickness ratio of the nickel layer to the gold layer is (2-10):1; Preferably, the diameter of the sphere is 1 to 200 μm, preferably 5 to 150 μm; Preferably, the material of the ball includes any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate, silicone, glass, nylon, polyimide, fluorine-containing resin, EVA, POE, ABS plastic or EBA plastic.

10. Use of a fixing assembly for photovoltaic module connecting welding strips and solar cells obtained by the fixing method for photovoltaic module connecting welding strips as claimed in any one of claims 4 to 9, characterized in that: The fixing component is used for a BC component, a perovskite component, a HJT component without a main grid or a TOPCon component without a main grid.

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