Solder strip pressing device

Abstract

The utility model relates to a welding strip pressing device, and belongs to the technical field of photovoltaic modules. The welding strip pressing device comprises a base with a frame structure. The pressing tool is connected with the base and can move up and down relative to the base; the hold-down device comprises two edge hold-down devices and at least one middle hold-down device, and the middle hold-down device is located between the two edge hold-down devices; the edge pressing tool comprises at least two edge transverse pressing strips and edge longitudinal pressing strips located between the two edge transverse pressing strips and arranged corresponding to the welding strips. The middle hold-down tool comprises at least two middle transverse hold-down strips and middle longitudinal hold-down strips which are located between the two middle transverse hold-down strips and arranged corresponding to the welding strips. The length direction of the edge longitudinal pressing strip and the length direction of the middle longitudinal pressing strip are consistent with the length direction of the welding strip; and in the length direction of the welding strip, an interval with a preset size is formed between the adjacent hold-down tools. According to the device, the welding strip is pressed by the pressing strip, so that pressure can be applied to the welding strip more uniformly, and the stress of the welding strip is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic module technical field especially relates to a welding band pressure device. BACKGROUND

[0002] In the preparation process of photovoltaic module, the welding band needs to be welded with the grid line of solar cell piece, so as to connect multiple solar cell pieces into a cell string. Infrared welding becomes an important welding method for realizing solar cell piece string welding due to its high heating efficiency, low equipment maintenance cost and other advantages. In infrared welding, the welding band needs to be fixed by using a welding band pressure device, and pressure needs to be applied to the welding band during welding to ensure sufficient contact between the welding band and the surface of the solar cell piece, so as to achieve good welding effect. In particular, in 0BB (Zero Busbar, zero main grid) technology, the welding band has as many as thousands of welding contact points with the cell piece, which puts higher requirements on the pressure device.

[0003] The commonly used welding band pressure device currently presses the welding band through a thimble structure, which will cause uneven force on the welding band and affect the welding quality. SUMMARY

[0004] In view of the problems existing in the prior art welding band pressure device, the utility model aims to provide a welding band pressure device to solve the problem of uneven force on the welding band during welding.

[0005] The utility model specifically includes the following technical schemes:

[0006] A welding band pressure device for pressing the welding band during solar cell piece string welding, characterized in that it comprises a base with a frame structure; and a pressure tool connected with the base and capable of moving up and down relative to the base; the pressure tool comprises two edge pressure tools and at least one middle pressure tool, the middle pressure tool being located between the two edge pressure tools; the edge pressure tool comprises at least two edge horizontal pressure strips and an edge vertical pressure strip corresponding to each welding band and located between the two edge horizontal pressure strips; the middle pressure tool comprises at least two middle horizontal pressure strips and a middle vertical pressure strip corresponding to each welding band and located between the two middle horizontal pressure strips; the length direction of the edge vertical pressure strip and the length direction of the middle vertical pressure strip are consistent with the length direction of the welding band; along the length direction of the welding band, there is a gap with a preset size between adjacent pressure tools.

[0007] Further, the base comprises two base bodies and a crossbeam arranged between the two base bodies; the length direction of the crossbeam is consistent with the length direction of the edge horizontal pressure strip and the middle horizontal pressure strip, and each edge horizontal pressure strip and each middle horizontal pressure strip corresponds to a crossbeam; a support column is arranged between the edge horizontal pressure strip and the crossbeam and between the middle horizontal pressure strip and the crossbeam; a through hole is formed in the crossbeam, the first end of the support column passes through the through hole, and the second end is connected with the edge horizontal pressure strip or the middle horizontal pressure strip.

[0008] Further, a spring is sleeved on the support column, one end of the spring abuts against the cross beam, and the other end abuts against the middle transverse pressing strip or the edge transverse pressing strip.

[0009] Further, the spring abutting against the edge transverse pressing strip has a smaller elastic coefficient than the spring abutting against the middle transverse pressing strip.

[0010] Further, the width of the edge longitudinal pressing strip and the width of the middle longitudinal pressing strip are greater than the width of the solder strip.

[0011] Further, the surface of the edge longitudinal pressing strip and the middle longitudinal pressing strip, which is in contact with the solder strip, has a structure for increasing surface friction.

[0012] Further, the width of the edge pressing tool is smaller than the width of the middle pressing tool.

[0013] Further, the edge pressing tool and the middle pressing tool are both made of a light-transmitting material.

[0014] Further, the number of the middle pressing tools is N-1, wherein N is the number of pads corresponding to each solder strip.

[0015] Further, the distance between the edge pressing tool and the middle pressing tool and the distance between two adjacent middle pressing tools are both 2K, wherein K is the length of the pad parallel to the direction of the solder strip.

[0016] Further, the number of longitudinal pressing strips of the edge pressing tool and the middle pressing tool is equal.

[0017] Further, the structure for increasing surface friction is embossing or spots.

[0018] Further, the width of the edge pressing tool is smaller than the width of the middle pressing tool.

[0019] Further, the light-transmitting material is quartz glass.

[0020] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0021] In the solder strip pressing device provided by the embodiment of the present application, the transverse pressing strips and the longitudinal pressing strips are arranged, and the longitudinal pressing strips are arranged correspondingly to the solder strips. In the embodiment of the present application, the pressing strips are used to replace the pins to press the solder strips. Compared with the pin structure, the pressing strips can apply pressure to the solder strips more uniformly, so that the solder strips are stressed more uniformly. In addition, in the embodiment of the present application, the pressing tools have a preset interval between adjacent pressing tools, and the interval corresponds to the position of the pads on the solar cell piece in the welding process, so that the position of the pads can be directly heated, and the welding strength of the pads and the solder strips is improved.

[0022] The above technical solutions can be combined with each other to realize more optional combination solutions. Other features and advantages of the present application will be described in the following description, and some advantages can be apparent from the description or can be understood by implementing the present application. The purposes and other advantages of the present application can be realized and obtained from the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings are only for the purpose of illustrating specific embodiments and are not considered as limiting the present application, and in the whole drawings, the same reference signs represent the same parts.

[0024] Figure 1 Structure schematic view of the welding strip pressing device of the embodiment one of the present application;

[0025] Figure 2 Top view of the welding strip pressing device of the embodiment one of the present application;

[0026] Figure 3 Front view of the welding strip pressing device of the embodiment one of the present application;

[0027] Figure 4 Enlarged view of A part of the welding strip pressing device of the embodiment one of the present application;

[0028] Figure 5 Structure schematic view of the welding strip pressing device of the embodiment two of the present application;

[0029] Figure 6 Top view of the welding strip pressing device of the embodiment two of the present application;

[0030] Figure 7 Top view of the welding strip pressing device of the present application when pressing the welding strip and the battery piece;

[0031] Figure 8 Partial side view of the welding strip pressing device of the present application. Figure 7

[0032] Reference signs:

[0033] 1-base; 2-edge presser; 21-edge longitudinal pressing strip; 22-edge transverse pressing strip; 3-middle presser; 31-middle longitudinal pressing strip; 32-middle transverse pressing strip; 4-spring; 5-cross beam; 6-supporting column; 7-welding strip; 8-solar cell piece. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings form a part of the present application and are used to explain the principles of the present application together with the embodiments of the present application, and are not used to limit the scope of the present application.​

[0035] This utility model provides a solder strip clamping device for clamping the solder strip during the string welding of solar cells in the manufacturing process of photovoltaic modules. For example... Figures 1-4 As shown, the welding strip clamping device includes: a base with a frame structure; and a clamp connected to the base and capable of moving up and down relative to the base. Here, "up and down" refers to... Figure 3 The up and down directions in the middle.

[0036] The presser includes two edge pressers 2 and at least one central presser 3, with the central presser 3 located between the two edge pressers 2. The edge pressers 2 include at least two transverse edge pressers 22 and a longitudinal edge presser 21 located between the two transverse edge pressers 22 and corresponding to each weld strip.

[0037] The transverse edge strips 22 are parallel to each other, and the longitudinal edge strips 21 are also parallel to each other. Together, the longitudinal edge strips 21 and the transverse edge strips 22 form a trapezoidal structure. The longitudinal edge strips 21 are used to fix the two ends of the welding strip 7, while the transverse edge strips 22 are used to enhance the overall stability and rigidity of the edge clamp 2.

[0038] The central pressure fixture 3 includes at least two central transverse pressure strips 32 and a central longitudinal pressure strip 31 located between the two central transverse pressure strips 32 and corresponding to each welding strip.

[0039] The transverse pressure strips 32 are parallel to each other, and the longitudinal pressure strips 31 are also parallel to each other. Together, the longitudinal pressure strips 31 and the transverse pressure strips 32 form a trapezoidal structure. The longitudinal pressure strips 31 are used to fix the middle position of the welding strip 7, while the transverse pressure strips 32 are used to enhance the overall stability and rigidity of the central pressure fixture 3.

[0040] The number of central longitudinal strips 31 can be equal to the number of edge longitudinal strips 21.

[0041] The longitudinal direction of the edge longitudinal strip 21 and the longitudinal direction of the middle longitudinal strip 31 are consistent with the longitudinal direction of the welding strip. Here, "longitudinal" refers to... Figure 2 The vertical direction in the text, "horizontal" refers to Figure 2 The left and right directions in the middle.

[0042] During string welding, the welding strip clamping device provided in this embodiment is placed on the solar cell with the welding strip already laid on it, with the length direction of the longitudinal clamping bar aligned with the length direction of the welding strip, and the longitudinal clamping bar corresponding to the welding strip one-to-one. The clamping tool moves downward to press down on the welding strip, and then welding is performed. Compared with the existing clamping device with a pin structure, the clamping bar can apply pressure to the welding strip more evenly, making the force on the welding strip more uniform.

[0043] Meanwhile, in the length direction of the solder strip, the adjacent pressing tools have a preset interval. The interval between the pressing tools is set according to the position of the solder pad (PAD point) on the grid line of the solar cell, so that, during the string welding, the position corresponding to the PAD point is not covered by the pressing tool and can be directly heated, so that the welding strength of the PAD point position and the solder strip is improved. The number and distribution of the middle pressing tools 3 can be flexibly adjusted according to the design of the cell layout. The number of the middle pressing tools 3 is N-1, and N is the number of the Pad points. The interval between the edge pressing tool 2 and the middle pressing tool 3 and the interval between adjacent middle pressing tools 3 can be 2K, wherein K is the length of the Pad point in the direction parallel to the solder strip 8. Taking a circular Pad with a diameter of 0.8 mm as an example, the above interval is preferably 1.6 mm.

[0044] The width of the edge longitudinal pressing strip 21 and the width of the middle longitudinal pressing strip 31 can be slightly greater than the width of the solder strip 8, so that the solder strip 7 can be better fixed.

[0045] The width of the edge pressing tool 2 (i.e. the sum of the length of the edge longitudinal pressing strip 21 and the width of the edge transverse pressing strip 22) can be less than the width of the middle pressing tool 3 (i.e. the sum of the length of the middle longitudinal pressing strip 31 and the width of the middle transverse pressing strip 32). The width of the edge pressing tool 2 is determined according to the distance between the Pad point close to the edge of the solar cell on the solar cell and the edge of the solar cell. The width of the middle pressing tool 3 is determined according to the distance between the two adjacent Pad points.

[0046] Further, the base of the frame structure includes two base bodies 1 and a cross beam 5 arranged between the two base bodies. A plurality of parallel and spaced cross beams 5 are fixedly arranged between the two base bodies 1 to form a fixed frame body.

[0047] The base body 1 is the basic support structure of the entire solder strip pressing device, which can be designed as a rectangular plate and has sufficient rigidity and stability to withstand the pressure and temperature changes during welding. The size of the base body 1 is determined according to the size and number of photovoltaic cells required for welding, and is usually a standard size for easy installation and use on an automated production line. The base body 1 and the cross beam 5 are made of high-strength and high-temperature-resistant materials, such as aluminum alloy or stainless steel, to ensure their long-term stability and durability in a high-temperature welding environment. The frame body formed by the base body 1 and the cross beam 5 serves as the support platform of the entire solder strip pressing device, providing a stable foundation to ensure that the relative positions of the various components remain unchanged during welding, thereby ensuring the consistency and reliability of the welding.

[0048] The length direction of the cross beam 5 is consistent with the length direction of the edge transverse pressing strip 22 and the middle transverse pressing strip 32, and each edge transverse pressing strip 22 and each middle transverse pressing strip 32 corresponds to a cross beam 5.

[0049] Supporting columns 6 are arranged between the edge transverse pressing strips 22 and the cross beams 5 and between the middle transverse pressing strips 3 and the cross beams 5. The cross beams 5 are provided with through holes, the first ends of the supporting columns 6 pass through the through holes, and the second ends of the supporting columns 6 are connected with the edge transverse pressing strips 22 or the middle transverse pressing strips 32.

[0050] Referring to Figure 3 、 Figure 4 The cross beams 5 are uniformly provided with a plurality of supporting columns 6 along the length direction, the upper ends of the supporting columns 6 protrude from the upper surface of the cross beams 5, the middle portions of the supporting columns 6 are located in the through holes in the cross beams 5, and the lower ends of the supporting columns 6 protrude from the lower surface of the cross beams 5, the supporting columns 6 can move up and down relative to the cross beams 5 along the height direction. Limiting blocks can be arranged at the bottom of the supporting columns 6, and the size of the limiting blocks can be greater than the size of the through holes of the cross beams 5, so that the supporting columns 6 are prevented from being pulled out of the through holes of the cross beams 5 upward. The top portions of the supporting columns 6 are fixedly connected with the lower surfaces of the edge pressing tools 2 or the middle pressing tools 3.

[0051] A spring 4 is sleeved on each supporting column 6, one end of the spring 4 abuts against the upper surface of the cross beam 5, and the other end of the spring 4 abuts against the lower surface of the edge pressing tool 2 or the middle pressing tool 3. The spring 4 can be a coil spring. The spring 4 has sufficient elasticity and restoring force to provide appropriate pressure during welding.

[0052] The size and elastic coefficient of the spring 4 are determined according to the required pressure. The elastic coefficient of the spring 4 in the edge pressing tool 2 can be smaller than the elastic coefficient of the spring in the middle pressing tool 3, so that the solder strip 7 at the pulling belt hand is prevented from being deformed when the lower pressing tool applies pressure to the solder strip 7.

[0053] The edge pressing tool 2 and the middle pressing tool 3 can be made of a material with good light transmittance, such as quartz glass, so as to allow infrared rays to penetrate during welding and directly irradiate the solder strip 7 and the solar cell 8. The light transmittance design of the edge pressing tool 2 allows the infrared rays to directly irradiate the solar cell 8, increases the heating area of the solar cell 8, reduces the temperature difference, and thus reduces the risk of cell cracking.

[0054] The flexible layout and light transmittance design of the middle pressing tool 3 make the welding process more uniform and efficient. They can be flexibly adjusted in number and position according to the design of the cell layout to ensure that each solder strip 7 can be fully fixed and heated.

[0055] In the optional implementation of the embodiment of the utility model, the edge longitudinal pressing strip 21 and the middle longitudinal pressing strip 31 have structures such as embossing and spots on the surface in contact with the solder strip 7 to increase the surface friction force, so as to ensure that the solder strip 7 will not slide or deviate during welding.

[0056] The working principle of the utility model is as follows:

[0057] Referring to Figure 7 、Figure 8 During the welding process, the solder strip 7 is placed above the solar cell 8, the solder strip pressing device provided by the embodiment of the utility model provides stable support platform through the base body 1, the edge pressing tool 2 and the middle pressing tool 3 are pressed on the solder strip 7 through the edge longitudinal pressing strip 21 and the middle longitudinal pressing strip 31 to fix the solder strip 7, the length direction of the edge longitudinal pressing strip 21 and the middle longitudinal pressing strip 31 is consistent with the length direction of the solder strip 7 pressed; and the infrared ray is allowed to penetrate the pressing tool to directly heat the cell 8. The spring 4 provides appropriate pressure, ensures that the solder strip 7 is in close contact with the cell 8, and at the same time avoids the deformation of the solder strip 7 due to excessive extrusion. The design of the whole device fully considers the factors such as temperature, pressure and stress uniformity in the welding process, which is beneficial to improve the welding quality.

[0058] Specifically, the solder strip pressing device provided by the embodiment of the utility model has the following technical effects:

[0059] The solder strip is stressed uniformly: the solder strip is fixed by the longitudinal pressing strip with a width greater than the solder strip, and appropriate pressure provided by the spring, so that the solder strip is stressed more uniformly during the welding process, avoiding the problems of solder strip deformation and fracture caused by uneven stress.

[0060] The heating area of the cell is increased: the light-transmitting property of the longitudinal pressing strip and the transverse pressing strip allows the infrared ray to directly irradiate the cell, increasing the heating area of the cell and reducing the temperature difference, thereby reducing the risk of cell cracking.

[0061] The welding temperature control is accurate: the solder strip pressing device provided by the embodiment of the utility model makes the temperature control during the welding process more accurate. By adjusting the distance and number of the pressing tools and the elastic coefficient of the spring, the welding temperature can be flexibly controlled to ensure the consistency and reliability of the welding quality.

[0062] Strong applicability: the number and distance of the pressing tools can be flexibly adjusted according to the cell layout, so that the solder strip pressing device can be applied to photovoltaic cell assemblies of different sizes and layouts, improving the applicability and flexibility of the solder strip pressing device.

[0063] Embodiment 1: infrared welding of solar cell with 5 Pad points in each column

[0064] Referring to Figures 1-4 The solder strip pressing device of the embodiment 1 includes two base bodies 1, two edge pressing tools 2, four middle pressing tools 3, a plurality of cross beams 5, a plurality of support columns 6 and a plurality of matched springs 4. There is a 1.6mm gap between the edge pressing tool 2 and the middle pressing tool 3 and between adjacent middle pressing tools 3, for allowing the front and back Pad points of the solar cell 8 at this position to directly receive the irradiation of the infrared ray. The width of the edge pressing tool 2 is less than the width of the middle pressing tool 3, to adapt to the fixing requirements of the solder strip 7 at different positions.

[0065] The edge longitudinal pressing strip 21 and the middle longitudinal pressing strip 31 have structures such as embossing, spots and the like to increase the surface friction of the contact surface with the solder strip 7, so as to ensure that the solder strip 7 does not slide or deviate during the welding process.

[0066] Welding process:

[0067] During the welding process, the infrared heating light source directly radiates and heats the photovoltaic solder strip 7 and the cell sheet 8 through the edge pressing tool 2 and the middle pressing tool 3. The front and back pad points of the interval area directly receive the radiation heating of the infrared rays, and the welding is completed. Due to the light-transmitting property of the pressing strip, the heating area of the cell sheet 8 is increased, and the temperature difference is reduced, thereby reducing the risk of cell cracking.

[0068] Embodiment 2: Infrared welding of a solar cell sheet with 2 pad points per column

[0069] The difference between this embodiment and embodiment 1 is that the number of the middle pressing tool is one.

[0070] Referring to Figures 5-6 , the solder strip pressing device of this embodiment 2 includes two base bodies 1, 2 edge pressing tools 2 and 1 middle pressing tool 3, and further includes a plurality of cross beams 5, a plurality of supporting columns 6 and a matched spring 4. There is a 1.6mm interval between the edge pressing tool 2 and the middle pressing tool 3 to adapt to the infrared welding requirement of the photovoltaic cell with 2 pad points per column.

[0071] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A solder strip pressing device for pressing a solder strip when a solar cell string is welded, characterized in that, The base comprises a frame structure; and The pressing device is connected with the base and can move up and down relative to the base; The edge pressing device (2) comprises at least two edge transverse pressing strips (22) and an edge longitudinal pressing strip (21) arranged corresponding to each solder strip between the two edge transverse pressing strips (22); The middle pressing device comprises at least two middle transverse pressing strips (32) and a middle longitudinal pressing strip (31) arranged corresponding to each solder strip between the two middle transverse pressing strips (32); The length direction of the edge longitudinal pressing strip (21) and the length direction of the middle longitudinal pressing strip (31) are consistent with the length direction of the solder strip; In the length direction of the solder strip, the interval between adjacent pressing devices has a preset size. The base comprises two base bodies (1) and a cross beam (5) arranged between the two base bodies (1); The length direction of the cross beam (5) is consistent with the length direction of the edge transverse pressing strip (22) and the middle transverse pressing strip (32), and each edge transverse pressing strip (22) and each middle transverse pressing strip (32) corresponds to a cross beam (5); 2. The weld strip hold down device of claim 1, wherein, Support columns (6) are arranged between the edge transverse pressing strip (22) and the cross beam (5) and between the middle transverse pressing strip (32) and the cross beam (5); the cross beam (5) is provided with a through hole, the first end of the support column (6) passes through the through hole, and the second end is connected with the edge transverse pressing strip (22) or the middle transverse pressing strip (32). A spring (4) is sleeved on the support column (6), one end of the spring (4) abuts against the cross beam (5), and the other end abuts against the middle transverse pressing strip (32) or the edge transverse pressing strip (22). The elastic coefficient of the spring (4) abutting against the edge transverse pressing strip (22) is smaller than the elastic coefficient of the spring (4) abutting against the middle transverse pressing strip (32).

3. The weld strip hold down device of claim 2, wherein, The width of the edge longitudinal pressing strip (21) and the width of the middle longitudinal pressing strip (31) are greater than the width of the solder strip.

4. The weld strip hold down device of claim 3, wherein, The surface of the edge longitudinal pressing strip (21) and the middle longitudinal pressing strip (31) in contact with the solder strip has a structure for increasing the surface friction.

5. The weld strip hold down device of claim 1, wherein, The width of the edge pressing device (2) is smaller than the width of the middle pressing device (3).

6. The weld strip hold down device of claim 1, wherein, The edge pressing device (2) and the middle pressing device (3) are made of a light-transmitting material.

7. The weld strip hold down device of claim 1, wherein, The number of the middle pressing devices (3) is N-1, wherein N is the number of pads corresponding to each solder strip.

8. The weld strip hold down device of claim 1, wherein, The interval between the edge pressing device (2) and the middle pressing device (3) and the interval between two adjacent middle pressing devices (3) are both 2K, wherein K is the length of the pad parallel to the direction of the solder strip.

9. The weld strip hold down device of claim 1, wherein, ​ 10. The solder strip hold-down device of claim 9, wherein, ​

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