A preparation device for a main grid-free photovoltaic cell string

Abstract

The present invention relates to the field of photovoltaic module technology, and discloses a busbar-less photovoltaic cell string preparation device. The device comprises a reeling mechanism, a shearing mechanism, and a conveyor mechanism, arranged from left to right. The conveyor mechanism holds two left and right cell sheets. The shearing mechanism cuts the welding wire from the reeling mechanism to supply the two cell sheets for serial connection. Above the conveyor mechanism, from left to right, are arranged a pressing block placement mechanism, a molten glue coating assembly, and a traction assembly. The traction assembly pulls the welding wire, placing the head of the welding wire on the adhesive film point on the front face of the right cell sheet and placing the tail of the welding wire on the conveyor mechanism. The molten glue coating assembly applies molten adhesive film particles to the front face of the right cell sheet and to the tail of the welding wire, with the left cell sheet placed at the adhesive film point at the tail of the welding wire. The adhesive film particles are EVA, POE, or EPE adhesive film particles. The pressing block placement mechanism places pressing blocks to pre-fix the welding wire and cell sheets bonded at the adhesive film point. An oven is installed to the right of the traction assembly. The preparation device has a simple structure, is easy to modify, reduces cracking, and improves reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic components, and in particular to a device for preparing a busbar-free photovoltaic cell string. Background Art

[0002] The development of crystalline silicon photovoltaic cells has been primarily constrained by production costs and power generation. Silicon material accounts for 60-70% of the production cost, while the silver paste required for the cell's busbars accounts for 20-30%. Therefore, the bold proposal of busbar-less technology reflects a pressing need to reduce production costs for crystalline silicon cells. This technology also helps increase the effective illuminated area of ​​crystalline silicon cells, boosting power generation.

[0003] However, the busbar-free technology developed by Schmid of Germany places very stringent requirements on welding machines, significantly increasing equipment costs. Suzhou Wotowei Automation Systems Co., Ltd., with publication number CN 216145631U, discloses a photovoltaic cell string manufacturing device and photovoltaic module production method. The device, which prepares a string of busbar-free cells, first applies adhesive film dots, then pre-fixes the cut welding wire using the adhesive film dots to the front of the busbar-free cells and the back of adjacent busbar-free cells, and then uses low-temperature welding to produce the photovoltaic cell string. However, the structure of this photovoltaic cell string manufacturing device is extremely complex, significantly increasing its investment costs. For example, this photovoltaic cell string manufacturing device requires first setting at least two adhesive film dots on the front of the busbar-free cells, then using a flipping device to set adhesive film dots on the back of the busbar-free cells. Furthermore, after bonding the welding wire on the front of the cells, the flipping device is also required to bond the back of the cells.

[0004] The structure of this photovoltaic cell string production device is quite different from that of the existing string welding machine, and it is difficult to transform it into the existing string welding machine used for high-temperature welding of main-grid cell panels into strings. The convertibility is poor, so this further increases the manufacturer's investment in equipment for stringing different types of photovoltaic cells (such as non-main-grid cell panels and main-grid cell panels).

[0005] In addition, the existing technology for stringing together main-grid-free solar cells (such as CN 216145631U) usually requires the introduction of new chemical substances (such as UV glue) to achieve pre-fixation of the film points. The UV glue is cured by UV and forms a hard, cured UV glue of a certain thickness at the local pre-fixation point between the welding wire and the solar cell. This will increase reliability issues such as solar cell cracking and increase the gap height of the local non-pre-fixed area between the welding wire and the solar cell. Therefore, under the subsequent heating and lamination of the photovoltaic module, the encapsulation film (such as the encapsulation film made of EVA, POE or EPE) is easy to overflow and fill into the gap after melting, thereby affecting the series connection quality and conductive effect. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device for preparing a busbar-less photovoltaic cell string.

[0007] Based on this, the present invention discloses a preparation device for a busbar-less photovoltaic cell string, including a winding mechanism for winding welding wire, a shearing mechanism, a conveying mechanism, a pressing block taking and placing mechanism, a melt-coating assembly for applying adhesive film, and a traction assembly;

[0008] Two battery cells adjacent to each other are placed on the conveying mechanism in sequence;

[0009] The shearing mechanism is installed between the winding mechanism and the traction assembly to cut the welding wire of the winding mechanism to connect two adjacent battery cells in series;

[0010] The pulling assembly is installed above the conveying mechanism to pull the welding wire so that the head of the welding wire is laid on the adhesive film point on the front of the right battery cell and the tail of the welding wire is placed on the conveying mechanism;

[0011] The molten glue coating assembly is installed above the conveying mechanism to apply molten glue film particles to the front surface of the right battery cell and the tail of the welding wire, and the left battery cell is placed at the glue film point at the tail of the welding wire;

[0012] The pressing block picking and placing mechanism is installed above the left end of the conveying mechanism to place the grabbed pressing block on the head of the welding wire and the left battery cell to pre-fix the welding wire and the battery cell that are point-bonded by the adhesive film;

[0013] An oven for curing the adhesive film applied between the welding wire and the battery sheet is installed on the right side of the traction component; the adhesive film particles are made of EVA, POE or EPE.

[0014] Preferably, the melt-gluing assembly is installed on the upper left of the traction assembly, and the melt-gluing assembly includes a melting device and a gluing device below the melting device;

[0015] The melting device is connected to a first telescopic cylinder for driving it to move up and down, and the first telescopic cylinder is connected to a first elastic part; the melting device includes a screw rod and a container, the first telescopic cylinder is connected to the upper end of the screw rod, the lower end of the screw rod extends into the container and is connected to the bottom of the container, and the lower end of the screw rod is also provided with a plurality of stirring rods extending obliquely downward; a feed port is opened at the upper part of the container, and a heating wire is provided in the side wall of the container.

[0016] Further preferably, the gluing device includes a gluing cylinder, a piston and a glue applicator filled with molten glue film particles, the piston is installed in the glue applicator, and the gluing cylinder is connected to the piston to drive the piston to squeeze the molten glue film particles in the glue applicator to make the glue applicator apply glue film points.

[0017] Further preferably, the bottom of the glue applicator is provided with several dispensing heads, the glue outlet of the dispensing head is provided with an inverted trapezoidal block, and a second elastic part connected to the inverted trapezoidal block is provided in the dispensing head, so that the inverted trapezoidal block can be driven to open and close the glue outlet of the dispensing head through the expansion and contraction of the second elastic part.

[0018] Preferably, the apparatus for preparing a busbar-less photovoltaic cell string further comprises a heat dissipation device installed on the right side of the oven for dissipating heat and cooling the cell string.

[0019] Further preferably, the device for preparing a main grid-less photovoltaic cell string further includes a pressure block removal mechanism installed on the right side of the heat dissipation device, and the pressure block removal mechanism is rotatably connected to the second telescopic cylinder so that the second telescopic cylinder drives the pressure block removal mechanism to move up and down to remove the pressure blocks on the cell string.

[0020] Preferably, a transmission device is installed on the upper left side of the conveying mechanism, and the transmission device is connected to the pressure block picking and placing mechanism and the suction cup device for placing the battery cell on the conveying mechanism; the suction cup device and the pressure block picking and placing mechanism are respectively connected to different sides of the transmission device, so that the transmission device drives the suction cup device and the pressure block picking and placing mechanism to rotate counterclockwise or clockwise.

[0021] Preferably, the shearing mechanism comprises at least two groups of cutters, which are respectively arranged above and below the welding wire, and each group of cutters is connected to a shearing cylinder, which drives the cutters to move up and down to cut the welding wire.

[0022] Preferably, the apparatus for preparing a busbar-less photovoltaic cell string further comprises a positioning guide post for positioning the welding wire, and the positioning guide post is installed on the left side of the shearing mechanism.

[0023] Further preferably, the outer surface of the welding wire is coated with a conductive alloy coating with a melting temperature of 140-160 degrees Celsius (referred to as low-temperature welding wire).

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] Compared with the existing photovoltaic cell string manufacturing device for producing busbar-free cell strings (CN 216145631 U), the busbar-free photovoltaic cell string manufacturing device of the present invention can not only perform glue film point connection on busbar-free PAD point cell sheets, meeting the needs of batch production of busbar-free PAD point photovoltaic cell strings (especially busbar-free PAD point photovoltaic cell strings connected in series using low-temperature welding wire) and mass production of photovoltaic modules, but also does not require additional equipment such as flipping devices, and has a simpler structure, which can reduce the investment cost of the device; the layout of the busbar-free photovoltaic cell string manufacturing device is more reasonable, and it can be easily converted into a welding device for high-temperature welding of busbar-with PAD point cell strings, thereby further reducing the manufacturer's equipment investment cost for stringing different types of photovoltaic cells (such as busbar-free cell sheets and busbar-with cell sheets).

[0026] Moreover, the preparation device of the busbarless photovoltaic cell string of the present invention has a small gap height between the welding wire and the cell sheet of the prepared cell string through the pre-fixation of the pressing block and the combination of the film particles of EVA, POE or EPE materials; therefore, in the subsequent heating and lamination process of the photovoltaic module, the risk of the cell string cracking can be greatly reduced, and the packaging film (such as the packaging film of EVA, POE or EPE material) can be effectively avoided from overflowing and filling into the gap after melting, thereby affecting the series connection quality and conductive effect; and the film particles used for the cell string are made of the same material as the packaging film used for the photovoltaic module. Compared with the existing technology of preparing busbarless photovoltaic cell strings with UV glue, no new adhesive material will be introduced, so the reliability of the entire photovoltaic module can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of a device for preparing a busbar-less photovoltaic cell string according to this embodiment.

[0028] Figure 2 This is a top view of the traction assembly with the welding wire clamped in this embodiment.

[0029] Figure 3 This is a front view of the transmission device of this embodiment after rotating 90 degrees counterclockwise.

[0030] Figure 4 Schematic diagram of the structure of the melt-coating component of this embodiment.

[0031] Figure 5 This is a partial enlarged view of the dispensing head of this embodiment.

[0032] Figure 6 This is a partial structural diagram of the dispensing head of this embodiment applying adhesive film dots on the right battery cell.

[0033] Figure 7 This is a schematic diagram of the local structure of the glue dispensing head of this embodiment applying glue film at the tail of the welding wire.

[0034] Figure 8 Schematic diagram of the partial structure of the photovoltaic cell string to be cured in this embodiment.

[0035] Figure 9 This is a schematic diagram of the partial structure of the photovoltaic cell string in the photovoltaic module after heating and lamination in this embodiment.

[0036] Explanation of the accompanying symbols: welding wire 1; battery cell 2; film point 3; winding mechanism 4; positioning guide 5; shearing mechanism 6; shearing cylinder 6-1; cutter 6-2; mounting frame 7; transmission device 8; suction cup device 9; block picking and placing mechanism 10; molten glue coating assembly 11; melting device 11-1; first elastic member 11-1-1; screw rod 11-1-2; stirring rod 11-1-3; container 11-1-4; feed port 11-1-5; heating wire 11-1-6; glue coating device 11-2; glue spraying Cylinder 11-2-1; piston 11-2-2; glue applicator 11-2-3; glue dispensing head 11-2-4; inverted trapezoidal block 11-2-5; second elastic member 11-2-6; first telescopic cylinder 12; traction assembly 13; traction cylinder 13-1; telescopic rod 13-1-1; slide rail 13-2; clamp 13-3; pressing block 14; heat dissipation device 15; pressing block removal mechanism 16; second telescopic cylinder 17; conveying mechanism 18; oven 19; alloy layer 20; molten film particles 21. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example

[0039] A manufacturing device for a busbar-free photovoltaic cell string in this embodiment is shown in FIG. Figure 1 , including a winding mechanism 4, a positioning guide column 5, a shearing mechanism 6, a conveying mechanism 18, a pressing block picking and placing mechanism 10, a melting glue coating component 11 of the glue film applying point 3, a traction component 13, an oven 19, a heat dissipation device 15 and a pressing block removing mechanism 16.

[0040] The winding mechanism 4 is used to wind up the welding wire 1. Specifically, the welding wire 1 is wound around the winding shaft of the winding mechanism 4, and the winding shaft of the winding mechanism 4 can rotate as the welding wire 1 is pulled, so as to realize the unwinding function of the welding wire 1.

[0041] Among them, the positioning guide post 5 is used to position the welding wire 1 to ensure that the position of the welding wire 1 corresponds to the position of the adhesive film point 3 on the battery cell 2 and does not deviate, and the position of the adhesive film point 3 on the battery cell 2 corresponds to the fine grid position of the battery cell 2, thereby improving the accuracy of the welding wire 1 in series with the battery cell 2, thereby reducing the series welding resistance, and effectively avoiding the defect of reducing the light receiving area of ​​the battery cell 2 due to the welding wire 1 blocking the battery cell 2. Specifically, the positioning guide post 5 is installed between the winding mechanism 4 and the shearing mechanism 6, and the positioning guide post 5 is installed on the left side of the shearing mechanism 6 (such as Figure 1 As shown), the welding wire 1 pulled from the winding shaft of the winding mechanism 4 is first positioned by the positioning guide column 5 and then sheared by the shearing mechanism 6.

[0042] In this embodiment, unless otherwise specified, the cell 2 is a photovoltaic cell without a busbar.

[0043] Among them, the shearing mechanism 6 is installed between the winding mechanism 4 and the traction assembly 13, and is used to cut the welding wire 1 pulled from the winding shaft of the winding mechanism 4, so that the cut welding wire 1 can be used to connect two adjacent battery cells 2 on the left and right (hereinafter referred to as the left battery cell 2 and the right battery cell 2 respectively) in series, thereby forming a battery string.

[0044] Specifically, the shearing mechanism 6 includes at least two sets of cutters 6-2, one set of cutters 6-2 being located above the welding wire 1 and the other set of cutters 6-2 being located below the welding wire 1. Each set of cutters 6-2 is connected to a shearing cylinder 6-1, with the cutters 6-2 positioned close to the welding wire 1 and the shearing cylinder 6-1 being positioned away from the welding wire 1. The shearing cylinder 6-1 has a telescopic shaft connected to the cutters 6-2, so that the shearing cylinder 6-1 drives the cutters 6-2 to move up and down to cut the welding wire 1.

[0045] In this embodiment, when the length of the pulled welding wire 1 meets the length requirement of the two adjacent battery cells 2 connected in series on the left and right, the shearing cylinder 6-1 located above the welding wire 1 drives the cutter 6-2 to move downward. At the same time, the shearing cylinder 6-1 located below the welding wire 1 drives the cutter 6-2 to move upward; in this way, the cutting of the welding wire 1 is achieved by the cooperation of the downward moving cutter 6-2 and the upward moving cutter 6-2.

[0046] Preferably, the cutting edges of the two groups of cutters 6-2 are symmetrically arranged up and down; that is, the cutting edges of the cutters 6-2 located above the welding wire 1 and the cutting edges of the cutters 6-2 located below the welding wire 1 are symmetrically arranged up and down to achieve fast and efficient cutting of the welding wire 1.

[0047] The traction assembly 13 is installed above the conveying mechanism 18 , and the traction assembly 13 pulls and pulls the welding wire 1 to move to the right side of the conveying mechanism 18 , thereby achieving the laying of the welding wire 1 .

[0048] Specifically, see Figure 1-2 The traction assembly 13 includes a slide rail 13-2, a traction cylinder 13-1 and a clamp 13-3 (such as a clamp) for clamping the welding wire 1. The slide rail 13-2 is installed above the conveying mechanism 18, and the clamp 13-3 is slidably connected to the left end of the slide rail 13-2, and the traction cylinder 13-1 is installed at the right end of the slide rail 13-2, and the telescopic rod 13-1-1 of the traction cylinder 13-1 is connected to the clamp 13-3, so that the traction cylinder 13-1 can drive the clamp 13-3 to slide left and right on the slide rail 13-2; in this way, under the drive of the traction cylinder 13-1, the clamp 13-3 holding the welding wire 1 can slide on the slide rail 13-2 toward the right side of the conveying mechanism 18 to realize automatic pulling of the welding wire 1, and then the clamp 13-3 can place the pulled welding wire 1 on the conveying mechanism 18.

[0049] Preferably, the slide rail 13-2 is provided with at least two tracks, and one of the tracks is located on the front side of the conveying mechanism 18, and the other track is located on the rear side of the conveying mechanism 18; in this way, the two tracks of the slide rail 13-2 are respectively arranged on the front and rear sides of the conveying mechanism 18, and the two tracks of the slide rail 13-2 will not form an obstruction to the upper space located in the middle of the conveying mechanism 18, so the molten glue coating assembly 11 can be installed in the upper space in the middle of the conveying mechanism 18, thereby saving installation space, making the layout of the entire main grid-free photovoltaic cell string preparation device more compact, and ensuring that the pulling of the welding wire 1 and the application of the glue film point 3 do not interfere with each other.

[0050] Among them, see Figure 1 、 3 A transmission device 8 is mounted on the upper left side of the conveyor mechanism 18, and is in driving connection with a suction cup device 9. The transmission device 8 can drive the suction cup device 9 to rotate counterclockwise or clockwise, so that the suction cup device 9 can place the right-side battery cell 2 on the conveyor mechanism 18. After the adhesive film point 3 is applied to the tail of the welding wire 1, the suction cup device 9 can also place the left-side battery cell 2 on the adhesive film point 3 at the tail of the welding wire 1.

[0051] For example, the conveying mechanism 18 drives the suction cup device 9 to rotate 90° counterclockwise, so that the suction cup device 9 places the sucked battery cell 2 onto the conveying mechanism 18. In practice, the conveying mechanism 18 can be controlled by an existing control system such as a PLC to rotate 90° counterclockwise or 90° clockwise.

[0052] Among them, see Figure 1 The melt coating assembly 11 is installed above the conveying mechanism 18 to apply the melted adhesive film particles 21 to the front of the right battery cell 2 (such as Figure 6 As shown) and the tail of the welding wire 1 (as shown Figure 7 As shown). Among them, the tail of the welding wire 1 is Figure 7The left side of the welding wire 1 is shown as being laid on the upper surface of the right battery cell 2 .

[0053] Specifically, see Figure 1 、 4 -5, the melt-coating assembly 11 is located to the upper left of the pulling assembly 13 and comprises a melting device 11-1 and a coating device 11-2 connected below the melting device 11-1. Melting device 11-1 heats and melts the film particles, which then flow rapidly, thanks to gravity, into the coating device 11-2 below. The coating device 11-2 then rapidly applies the film dots 3.

[0054] Specifically, the melting device 11-1 is connected to the first telescopic cylinder 12, which can drive the melting device 11-1 to move up and down, and then the melting device 11-1 moving up and down drives the glue coating device 11-2 to move up and down together, so that the glue coating device 11-2 can move away from or close to the right battery cell 2 and the tail of the welding wire 1 on the conveying mechanism 18, and then complete the application of the glue film point 3 on the right battery cell 2 and the tail of the welding wire 1.

[0055] The melting device 11-1 includes a screw rod 11-1-2 and a container 11-1-4. The first telescopic cylinder 12 is connected to the upper end of the screw rod 11-1-2, and the first telescopic cylinder 12 is connected to a first elastic member 11-1-1 (such as a spring).

[0056] When the first telescopic cylinder 12 drives the screw rod 11-1-2 to move downward, the first elastic member 11-1-1 is stretched due to the downward movement of the telescopic rod of the first telescopic cylinder 12; and when the first telescopic cylinder 12 drives the screw rod 11-1-2 to move upward, the first elastic member 11-1-1 can use its own elastic recovery effect to prompt the first telescopic cylinder 12 to drive the screw rod 11-1-2 to move upward quickly through the telescopic rod, so as to prevent the risk of downtime caused by the first telescopic cylinder 12 failing to recover after descending.

[0057] The lower end of the screw 11-1-2 extends into the container 11-1-4 and is connected to the bottom of the container 11-1-4. The upward and downward movement of the screw 11-1-2 drives the container 11-1-4 to move upward and downward synchronously. A feed port 11-1-5 is provided at the top of the container 11-1-4, allowing the film particles to be quickly fed into the container 11-1-4 through the feed port 11-1-5. A heating wire 11-1-6 is provided within the sidewall of the container 11-1-4 to heat and melt the film particles. Furthermore, the lower end of the screw 11-1-2 is provided with several stirring rods 11-1-3 extending obliquely downward. The rotation of the screw 11-1-2 drives the stirring rods 11-1-3 to rotate with it, thereby stirring the film particles within the container 11-1-4. In an example of this embodiment, the number of the stirring rods 11-1-3 is preferably three, and the three stirring rods 11-1-3 are distributed at intervals on the spiral rod 11-1-2.

[0058] By cooperating with the stirring rod 11-1-3 and the heating wire 11-1-6, the film particles in the container 11-1-4 are stirred and heated to melt, thereby accelerating the heating and melting process of the film particles and avoiding local overheating of the film particles that affects the quality of the melted film particles 21.

[0059] The glue coating device 11-2 includes a glue cylinder 11-2-1 (such as a telescopic cylinder), a piston 11-2-2, and a glue applicator 11-2-3 filled with molten glue film particles 21. The piston 11-2-2 is installed in the glue applicator 11-2-3. The glue cylinder 11-2-1 is connected to the piston 11-2-2 to drive the piston 11-2-2 to squeeze the molten glue film particles 21 in the glue applicator 11-2-3, providing downward squeezing force for the molten glue film particles 21 in the glue applicator 11-2-3, thereby enabling the glue applicator 11-2-3 to apply the glue film dots 3. The piston 11-2-2 is preferably a single-way piston.

[0060] More specifically, see Figure 4-5 A number of dispensing heads 11-2-4 are arranged in sequence at the bottom of the glue applicator 11-2-3, and the glue outlet of each dispensing head 11-2-4 is provided with an inverted trapezoidal block 11-2-5, and a second elastic member 11-2-6 (such as a spring) connected to the top of the inverted trapezoidal block 11-2-5 is provided in the dispensing head 11-2-4. The inverted trapezoidal block 11-2-5 is driven by the up and down telescopic movement of the second elastic member 11-2-6 to open or close the glue outlet of the dispensing head 11-2-4.

[0061] See also Figure 1 、 4-5, taking the application of glue film dots 3 on the front of the right battery cell 2 as an example, the working process of the molten glue coating component 11 is: the glue film particles are poured into the container 11-1-4 from the feed port 11-1-5, and the spiral rod 11-1-2 starts to rotate to drive the stirring rod 11-1-3 to stir the glue film particles. At the same time, the heating wire 11-1-6 heats and melts the stirred glue film particles. The molten glue film particles 21 flow quickly to the piston 11-2-2 of the glue applicator 11-2-3 under the action of gravity, and flow to fill each glue dispensing head 11-2-4; therefore, when it is necessary to apply the molten glue film particles 21, the glue cylinder 11-2-1 drives the piston 11-2-2 to squeeze the molten glue film particles 21 in the glue applicator 11-2-3, so that the lower part of the glue applicator 11-2-3 The dispensing head 11-2-4 at the bottom is filled with molten adhesive film particles 21, and then when the dispensing head 11-2-4 is lowered to the front of the right battery cell 2 along with the glue coating device 11-2, the inverted trapezoidal block 11-2-5 gently touches the front of the right battery cell 2, so that the second elastic member 11-2-6 contracts to drive the inverted trapezoidal block 11-2-5 to move upward, so as to open the glue outlet of the dispensing head 11-2-4, so that the molten adhesive film particles 21 in the dispensing head 11-2-4 are applied to the local position of the front of the right battery cell 2 to complete the application of the adhesive film point 3, and then obtain the right battery cell 2 with the adhesive film point 3 applied on the front, so that the head of the welding wire 1 to be pulled out later can be laid at the adhesive film point 3 on the front of the right battery cell 2, so that the head of the welding wire 1 can be bonded to the front of the right battery cell 2 through the adhesive film point 3. Among them, the head of the welding wire 1 is Figure 7 The right side of the welding wire 1 is shown being coated with adhesive film point 3.

[0062] In this embodiment, see Figure 4-5 The container 11-1-4, the channel connecting the container 11-1-4 and the glue applicator 11-2-3, and the glue applicator 11-2-3 are preferably an integrated connection structure, and the integrated connection structure is provided with an outer wall and an inner wall, both of which are made of a high-temperature resistant alloy material; the heating wire 11-1-6 is located between the outer wall and the inner wall of the integrated connection structure. In one example of this embodiment, the outer wall and the inner wall of the integrated connection structure are sealed to protect the heating wire 11-1-6 and effectively prevent the heat of the heating wire 11-1-6 from quickly dissipating into the external air, thereby reducing the heating and melting process of the film particles by the heating wire 11-1-6 and avoiding heat waste. The integrated connection structure has a simple structure, and in addition to the heating wire 11-1-6 provided in the container 11-1-4, the heating wire 11-1-6 is also provided in the channel and the glue applicator 11-2-3, so as to effectively keep the molten film particles 21 warm.

[0063] See also Figure 1 、 3The compacting mechanism 10 is mounted above the left end of the conveyor mechanism 18, and the transmission device 8 is also connected to the compacting mechanism 10 (e.g., a clamp). The transmission device 8 can drive the compacting mechanism 10 to rotate counterclockwise or clockwise, allowing the compacting mechanism 10 to place the compacting mechanism 10 onto the head of the welding wire 1 and the left battery cell 2, thereby pre-fixing the welding wire 1 and battery cell 2 bonded together at the adhesive film point 3. The weight of the compacting mechanism 14 allows the welding wire 1 and battery cell 2 to be bonded more tightly together at the adhesive film point 3, thereby reducing the gap height between the welding wire 1 and battery cell 2.

[0064] In an example of this embodiment, the conveying mechanism 18 drives the pressing block taking and placing mechanism 10 to rotate 90° clockwise, so that the pressing block taking and placing mechanism 10 places the clamped pressing block 14 on the head of the welding wire 1 or the left battery cell 2.

[0065] Furthermore, the suction cup device 9 and the briquette picking and placing mechanism 10 are respectively connected to different sides of the transmission device 8 to prevent the suction cup device 9 and the briquette picking and placing mechanism 10 from interfering with each other, and to make the structure of the entire device more compact, save installation space, simplify the structure of the entire preparation device, and improve work efficiency.

[0066] See also Figure 1 、 7 -8, after the head of the welding wire 1 is bonded to the front surface of the right battery cell 2 via the adhesive film point 3 and pre-fixed with the pressing block 14, the tail of the welding wire 1 is directly placed on the conveyor mechanism 18 under the pulling and traction of the traction assembly 13. The adhesive film point 3 is applied to the tail of the welding wire 1 using the molten glue coating assembly 11. The left battery cell 2 is then placed at the adhesive film point 3 of the tail of the welding wire 1, so that the back of the left battery cell 2 and the tail of the welding wire 1 are bonded via the adhesive film point 3. The pressing block placement mechanism 10 then places the taken pressing block 14 on the front surface of the left battery cell 2, so that the tail of the welding wire 1 can be better bonded and pre-fixed to the adhesive film point 3 on the back of the left battery cell 2. In this way, the welding wire 1 can achieve a preliminary connection between the front surface of the right battery cell 2 and the back surface of the left battery cell 2, preparing for the subsequent fixing of the adhesive film point 3 in the oven 19.

[0067] Among them, see Figure 1 The oven 19 is installed on the right side of the traction assembly 13 to cure the adhesive film point 3 applied between the welding wire 1 and the battery cell 2 to form a battery string.

[0068] Among them, see Figure 1 The heat dissipation device 15 is installed on the right side of the oven 19 to dissipate heat and cool the battery string to prevent the temperature from being too high and affecting the subsequent manual repair and subsequent preparation of photovoltaic modules.

[0069] Among them, see Figure 1The pressing block removing mechanism 16 (such as a clamp) is installed on the right side of the heat dissipation device 15, and the pressing block removing mechanism 16 is rotatably connected to the second telescopic cylinder 17, so that the second telescopic cylinder 17 drives the pressing block removing mechanism 16 to move up and down to remove the pressing block 14 on the battery string.

[0070] See also Figure 1 Taking the compact removal mechanism 16 removing the compact 14 on the front of the right solar cell 2 of the battery string as an example, the working process of the compact removal mechanism 16 is as follows: the second telescopic cylinder 17 drives the compact removal mechanism 16 to descend, so that the compact removal mechanism 16 takes the compact 14 on the front of the right solar cell 2, and then rotates to another conveying mechanism 18 to move the compact 14 to another conveying mechanism 18 of the preparation device of the busbarless photovoltaic battery string. Then, the other conveying mechanism 18 returns the compact 14 to the side of the transmission device 8 for the compact picking and placing mechanism 10 to clamp the compact 14.

[0071] See also Figure 1 A mounting frame 7 is provided above the conveying mechanism 18 , and the first telescopic cylinder 12 , the heat dissipation device 15 and the second telescopic cylinder 17 can all be installed on the mounting frame 7 .

[0072] When working, see Figure 1 、 4 , 6-8, place the right battery cell 2 on the conveying mechanism 18, so that the right battery cell 2 moves to the right along with the conveying mechanism 18; then the first telescopic cylinder 12 drives the molten glue coating assembly 11 to move downward, so that the molten glue coating assembly 11 applies the molten glue film particles 21 to the glue film point 3 position on the front of the right battery cell 2 through the glue coating device 11-2 (such as Figure 6 As shown); then, under the pulling and traction of the traction component 13, the head of the welding wire 1 is laid on the adhesive film point 3 on the front of the right battery cell 2, so as to achieve the bonding of the head of the welding wire 1 and the front of the right battery cell 2 through the adhesive film point 3; at the same time, the transmission device 8 drives the pressing block picking and placing mechanism 10 to rotate, so that the pressing block picking and placing mechanism 10 places the clamped pressing block 14 on the head of the welding wire 1, so that the head of the welding wire 1 and the adhesive film point 3 on the front of the right battery cell 2 are better bonded and pre-fixed, and the gap height between the head of the welding wire 1 and the right battery cell 2 is reduced (as shown). Figure 7 As shown). Afterwards, the shearing assembly shears the tail of the welding wire 1; the conveyor belt of the conveying mechanism 18 rotates so that the tail of the welding wire 1 is directly placed on the conveying mechanism 18 and the tail of the welding wire 1 reaches directly below the molten glue coating assembly 11; then the first telescopic cylinder 12 drives the molten glue coating assembly 11 to move downward, so that the molten glue coating assembly 11 applies the molten glue film particles 21 to the tail of the welding wire 1 through the glue coating device 11-2 (as shown). Figure 7As shown); then, place the left battery cell 2 at the adhesive film point 3 at the tail of the welding wire 1. Repeat the above operation to apply the molten adhesive film particles 21 to the adhesive film point 3 on the front of the left battery cell 2 through the adhesive coating device 11-2, and lay the head of the second section of the welding wire 1 at the adhesive film point 3 on the front of the left battery cell 2; then make the pressing block picking and placing mechanism 10 work repeatedly to place the pressing block 14 at the head of the second section of the welding wire 1, so as to achieve better bonding and pre-fixation at the adhesive film point 3 between the head of the second section of the welding wire 1, the tail of the welding wire 1 and the left battery cell 2, and reduce the gap height between the left battery cell 2 and the welding wire 1, forming a battery string to be solidified (as shown). Figure 8 As shown. Then, a conveyor mechanism 18 transports the cell string to be cured into an oven 19, where the temperature is set to 130-150 degrees Celsius (preferably 140 degrees Celsius) to cure the adhesive film points 3 of the cell string. The conveyor mechanism 18 then transports the connected and cured cell string out of the oven 19, where the heat sink 15 cools the cell string. The compacting block removal mechanism 16 then removes the compacting blocks 14 from the cell string, resulting in a securely connected and structurally stable cell string. This busbar-less photovoltaic cell string preparation device repeats the above process to achieve mass production of photovoltaic cell strings.

[0073] If the preparation device for the busbar-free photovoltaic cell string of this embodiment is to be used for string welding of busbar-equipped cell sheets 2, it is only necessary to replace the molten glue coating component 11 of the preparation device for the busbar-free photovoltaic cell string with a welding device, replace the glue film particles with welding material, remove the oven 19, and add a bottom heating platform. The overall changes are relatively small and it is easy to transform into an existing string welding machine to perform high-temperature welding of busbar-equipped cell sheets into strings.

[0074] Compared with the existing photovoltaic cell string manufacturing device for producing busbar-free cell strings (CN 216145631 U), the busbar-free photovoltaic cell string manufacturing device of this embodiment can connect the busbar-free PAD point cell slices 2 with glue film points 3 in series, meeting the needs of mass production of busbar-free PAD point photovoltaic cell strings and mass production of photovoltaic modules, and does not require additional equipment such as flipping devices. The structure is simpler and the investment cost of the device can be reduced. Moreover, the layout of the busbar-free photovoltaic cell string manufacturing device is more reasonable and can be easily converted into a welding device for high-temperature welding of busbar-with PAD point cell strings. Therefore, it can further reduce the manufacturer's equipment investment cost for stringing together different types of photovoltaic cell slices 2 (such as busbar-free cell slices 2 and busbar-with cell slices 2).

[0075] In this embodiment, the adhesive film particles are EVA adhesive film particles, POE adhesive film particles, or EPE adhesive film particles. Compared with UV adhesive, these adhesive film particles are softer in nature. Therefore, during the pre-fixation of the pressing block 14 and the subsequent heating and lamination of the photovoltaic module, the gap height between the welding wire 1 and the battery cell 2 can be further reduced.

[0076] Moreover, in this embodiment, the outer surface of the welding wire 1 is also coated with a conductive alloy coating having a melting temperature of 140-160 degrees Celsius. Therefore, during the subsequent heating and lamination process of the photovoltaic module, the alloy coating on the outer surface of the welding wire 1 will melt rapidly and fill the only small gap between the welding wire 1 and the battery cell 2 to form an alloy layer 20 (such as Figure 9 As shown), a better conductive connection is achieved between the welding wire 1 and the surface of the battery cell 2.

[0077] Therefore, the preparation device of the busbar-free photovoltaic cell string of this embodiment, through the pre-fixation of the pressing block 14, the film particles of EVA or POE or EPE material, and the alloy coating on the outer surface of the welding wire 1, the gap height between the welding wire 1 and the battery cell 2 of the prepared battery string is small; therefore, in the subsequent heating and lamination process of the photovoltaic module, the risk of the battery string cracking can be greatly reduced, and the alloy coating will melt quickly and fill into the only small gap between the welding wire 1 and the battery cell 2, so it can effectively avoid the packaging film (such as the packaging film of EVA or POE or EPE material) from overflowing and filling into the gap after melting, affecting the series connection quality and conductive effect; in addition, the film particles used for the battery string are made of the same material as the packaging film used for the photovoltaic module. Compared with the existing technology of preparing busbar-free photovoltaic cell strings with UV glue, no new adhesive material will be introduced, so the reliability of the entire photovoltaic module can also be improved.

[0078] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0079] The technical solution provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for preparing a busbar-less photovoltaic cell string, characterized in that: It includes a winding mechanism for winding the welding wire, a shearing mechanism, a conveying mechanism, a pressing block taking and placing mechanism, a melt-coating component for applying the adhesive film, and a traction component; Two battery cells adjacent to each other are placed on the conveying mechanism in sequence; The shearing mechanism is installed between the winding mechanism and the traction assembly to cut the welding wire of the winding mechanism to connect two adjacent battery cells in series; The pulling assembly is installed above the conveying mechanism to pull the welding wire so that the head of the welding wire is laid on the adhesive film point on the front of the right battery cell and the tail of the welding wire is placed on the conveying mechanism; The molten glue coating assembly is installed above the conveying mechanism to apply molten glue film particles to the front surface of the right battery cell and the tail of the welding wire, and the left battery cell is placed at the glue film point at the tail of the welding wire; The pressing block picking and placing mechanism is installed above the left end of the conveying mechanism to place the grabbed pressing block on the welding wire and the battery cell to pre-fix the welding wire and the battery cell that are point-bonded by the adhesive film; An oven for curing the adhesive film applied between the welding wire and the battery cell is installed on the right side of the traction component; the adhesive film particles are made of EVA, POE or EPE; The melt-coating assembly is installed on the upper left of the traction assembly, and the melt-coating assembly includes a melting device and a coating device connected to the bottom of the melting device; The melting device is connected to a first telescopic cylinder for driving the melting device to move up and down, and the first telescopic cylinder is connected to a first elastic member; the melting device includes a screw rod and a container, the first telescopic cylinder is connected to the upper end of the screw rod, the lower end of the screw rod extends into the container and is connected to the bottom of the container, and the lower end of the screw rod is also provided with a plurality of stirring rods extending obliquely downward; the upper portion of the container is provided with a feed port, and the side wall of the container is provided with a heating wire; The glue coating device includes a glue cylinder, a piston and a glue applicator filled with melted glue film particles. The piston is installed in the glue applicator. The glue cylinder is connected to the piston to drive the piston to squeeze the melted glue film particles in the glue applicator to make the glue applicator apply glue film dots. The bottom of the glue applicator is provided with several dispensing heads, the glue outlet of the dispensing head is provided with an inverted trapezoidal block, and a second elastic member connected to the inverted trapezoidal block is provided in the dispensing head, so that the inverted trapezoidal block can be driven to open and close the glue outlet of the dispensing head through the expansion and contraction of the second elastic member.

2. The manufacturing device of a busbar-less photovoltaic cell string according to claim 1, characterized in that: It also includes a heat dissipation device installed on the right side of the oven to dissipate heat and cool the battery string.

3. The device for preparing a busbar-less photovoltaic cell string according to claim 2, characterized in that: It also includes a compression block removal mechanism installed on the right side of the heat dissipation device, which is rotatably connected to the second telescopic cylinder so that the second telescopic cylinder drives the compression block removal mechanism to move up and down to remove the compression blocks on the battery string.

4. The device for preparing a busbar-less photovoltaic cell string according to claim 1, wherein: A transmission device is installed on the upper left side of the conveying mechanism, and the transmission device connects the briquetting mechanism and the suction cup device for placing the battery cell on the conveying mechanism; the suction cup device and the briquetting mechanism are respectively connected to different sides of the transmission device, so that the transmission device drives the suction cup device and the briquetting mechanism to rotate counterclockwise or clockwise.

5. The device for preparing a busbar-less photovoltaic cell string according to claim 1, characterized in that: The shearing mechanism includes at least two groups of cutters, which are respectively arranged above and below the welding wire. Each group of cutters is connected to a shearing cylinder, which drives the cutters to move up and down to cut the welding wire.

6. The device for preparing a busbar-less photovoltaic cell string according to claim 1, characterized in that: It also includes a positioning guide column for positioning the welding wire, and the positioning guide column is installed on the left side of the shearing mechanism.

7. The device for preparing a busbar-less photovoltaic cell string according to any one of claims 1 to 6, characterized in that: The outer surface of the welding wire is coated with a conductive alloy coating with a melting temperature of 140-160 degrees Celsius.

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