A tinning device for triangular segmented photovoltaic welding strip

Abstract

The present invention discloses a triangular segmented photovoltaic welding strip and a tinning device, comprising at least one period of welding strip segments, wherein a single period of welding strip segments comprises a reflection segment and a back welding segment, wherein the reflection segment is joined to the front grid line of a photovoltaic cell, and the back welding segment is joined to the back of an adjacent photovoltaic cell, wherein the reflection segment is in a triangular strip structure, wherein the reflection segment comprises a waist surface for reflection and a bottom surface connected to the photovoltaic cell, wherein at least one groove parallel to the bottom surface is concavely arranged on the waist surface, and the surfaces of the reflection segment and the back welding segment are covered with a tin layer. The triangular photovoltaic welding strip provided by the present invention has a V-shaped groove parallel to the bottom surface on the waist surface of the reflection segment, which can utilize light reflection and facilitate blowing away excess tin liquid along the groove through a wind knife after tinning. The tinning device provided by the present invention has a derailment detection mechanism arranged at the front and rear to perform alarm detection on the derailment of the substrate, thereby ensuring the quality of tinning of the substrate.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic technology, and in particular to a tinning device for a triangular segmented photovoltaic welding strip. Background Art

[0002] In recent years, the number of busbars in solar cells has become a hot topic. Cell manufacturers have increased the number of busbars from 3 to 4, 5 or even 6 to improve efficiency, while module manufacturers have continuously reduced the amount of silver paste used in cells to reduce costs. The busbars have become thinner and thinner, and the number of busbars has increased to more than a dozen or even dozens. These two technical routes to increase the number of busbars are called multi-busbar and busbar-free technologies, respectively. The two technologies have the same goal and have the advantages of high performance and low cost, or even more. The existing multi-busbar and busbar-free modules use welding strips that are mostly flat in shape, and the cross-section is large, which blocks the cell busbar, resulting in a large loss of light, which in turn leads to power loss. Summary of the invention

[0003] In view of the defects of the above-mentioned prior art, the main purpose of the present invention is to overcome the shortcomings of the prior art and discloses a triangular segmented photovoltaic welding strip, including at least one period of welding strip segments, wherein the welding strip segments of a single period include a reflection segment and a back welding segment, wherein the reflection segment is joined to the front grid line of the photovoltaic cell, and the back welding segment is joined to the back of the adjacent photovoltaic cell, and the reflection segment is in a triangular strip structure, wherein the reflection segment includes a waist surface for reflection and a bottom surface connected to the photovoltaic cell, wherein at least one groove parallel to the bottom surface is concavely arranged on the waist surface, and the surfaces of the reflection segment and the back welding segment are covered with a tin layer.

[0004] Furthermore, the back welding section is flat.

[0005] Furthermore, the groove is angular.

[0006] A tinning device for a triangular segmented photovoltaic welding strip comprises a tin pool, a liquid receiving pool, a triangular wind knife, a derailment detection mechanism and a cooling fan. A first guide wheel, a second guide wheel, a third guide wheel, a fourth guide wheel, a fifth guide wheel and a sixth guide wheel are sequentially arranged from right to left. The first guide wheel, the second guide wheel, the third guide wheel and the fourth guide wheel are in an inverted trapezoidal structure. The fifth guide wheel and the sixth guide wheel are higher than the fourth guide wheel. The derailment detection mechanism is arranged at an inlet end and an outlet end respectively. The cooling fan is arranged above the fifth guide wheel and the sixth guide wheel. The triangular wind knife is arranged between the fourth guide wheel and the fifth guide wheel. The triangular wind knife is used to blow away excess tin liquid on a waist surface and a bottom surface. The second guide wheel and the third guide wheel are immersed in the tin pool. A liquid receiving pool is arranged below the fourth guide wheel and the fifth guide wheel. The fourth guide wheel and the fifth guide wheel are connected to electrodes so that a short circuit is formed in the photovoltaic welding strip between the fourth guide wheel and the fifth guide wheel.

[0007] Furthermore, square guide grooves are arranged on the first guide wheel, the fourth guide wheel, the fifth guide wheel and the sixth guide wheel, and V-shaped guide grooves matching the top angles of the photovoltaic welding strips are arranged on the second guide wheel and the third guide wheel.

[0008] Furthermore, the derailment detection mechanism includes a detection mechanism and a supporting mechanism, the detection mechanism includes a bracket, an adjustment beam, a swing arm, a tension spring, a spring, a pressure wheel, an adjustment bolt, an adjustment block, a slider and a proximity switch, the adjustment beam is horizontally arranged on the bracket, an adjustment groove is arranged on the adjustment beam along its length direction, a guide rail parallel to the adjustment groove is arranged on the upper surface of the adjustment beam, pulleys are arranged on both sides of the slider, and an adjustment hole is arranged on the slider, the pulley is arranged on the guide rail, the adjustment block is upwardly protruded to provide a locking block and an adjustment rod, and the adjustment rod passes through the adjustment The groove is vertically slidably connected with the adjustment hole, the spring is sleeved on the adjustment rod and connected with the upper end of the adjustment rod and the slider respectively, the lower surface of the adjustment beam is evenly spaced to provide locking grooves that cooperate with the locking block, the adjustment block is vertically provided with screw holes that penetrate, the adjustment bolt cooperates with the screw holes, the swing arm is rotatably arranged at the lower end of the bracket, the pressure wheel is rotatably arranged at one end of the swing arm, and the other end is connected with the adjustment beam through a tension spring, and the proximity switch is adjustably arranged on the adjustment block; a V-shaped groove is arranged on the pressure wheel, and planes are arranged on both sides of the V-shaped groove;

[0009] The support mechanism comprises a support frame and a support wheel, the support frame is horizontally provided with a waist-shaped hole, and the support wheel is arranged on the support frame and is adjustably connected to the waist-shaped hole;

[0010] The pressing wheel is pressed on the supporting wheel and is tangent to the horizontal plane.

[0011] Furthermore, each side wind of the triangular wind knife forms an angle of 10°-30° with the waist surface or the bottom surface.

[0012] Furthermore, it also includes a first baffle and a second baffle, the first baffle is arranged above the fourth guide wheel and forms an angle of 30°-60° with the horizontal plane, and the second baffle is vertically arranged below the fourth guide wheel.

[0013] Beneficial effects achieved by the present invention:

[0014] The triangular photovoltaic welding strip provided by the present invention adopts a V-shaped groove parallel to the bottom surface on the waist surface of the reflective section, which not only utilizes light reflection but also facilitates blowing away excess tin liquid along the groove through a wind knife after tinning.

[0015] The tinning device provided by the present invention is provided with derailment detection mechanisms at the front and rear to alarm and detect derailment of the substrate, thereby ensuring the quality of tinning on the substrate; at the same time, a movable adjustment block is used to roughly adjust the upper limit position of the swing arm, and the adjustment bolt is finely adjusted to reduce the adjustment stroke of the adjustment bolt. By short-circuiting the substrate to generate heat, the wind knife is promoted to blow away the excess tin liquid on the surface of the substrate, thereby ensuring that the surface shape of the triangular photovoltaic welding strip is prominent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A diagram showing the use status of a triangular segmented photovoltaic welding ribbon of the present invention;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of a triangular segmented photovoltaic welding strip of the present invention;

[0018] Figure 3 Schematic diagram of the end face structure of the reflection section;

[0019] Figure 4 It is a structural schematic diagram of a tinning furnace for a triangular segmented photovoltaic welding ribbon of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the detection structure of the derailment detection mechanism;

[0021] Figure 6 The schematic diagram of the structure for adjusting the crossbeam;

[0022] Figure 7 A schematic diagram of the structure for adjusting the crossbeam from another perspective;

[0023] Figure 8 The figure is a schematic diagram of the coordination between the adjusting block and the swing arm;

[0024] The reference numerals are as follows:

[0025] 1. Reflection section, 2. Back welding section, 9. Photovoltaic cell, 11. Waist surface, 12. Bottom surface, 13. Groove, 14. First reflection surface, 15. Second reflection surface, 31. Tin pool, 32. Liquid receiving pool, 4. Triangular wind knife, 51. Bracket, 52. Adjustment beam, 53. Swing arm, 54. Tension spring, 55. Spring, 56. Pressure wheel, 57. Adjustment bolt, 58. Adjustment block, 59. Slider, 60. Proximity switch, 61. Support frame, 62. Support wheel, 71. First guide wheel, 72. Second guide wheel, 73. Third guide wheel, 74. Fourth guide wheel, 75. Fifth guide wheel, 76. Sixth guide wheel, 81. First baffle, 82. Second baffle, 521. Adjustment groove, 522. Guide rail, 523. Lock groove, 581. Lock block, 582. Adjustment rod, 591. Pulley, 611. Waist hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] A triangular segmented photovoltaic ribbon, such as Figure 1-3 As shown, it includes at least one period of welding strip segments, and a single period of welding strip segments includes a reflection segment 1 and a back welding segment 2. The reflection segment 1 is bonded to the front grid line of the photovoltaic cell 9, and the back welding segment 2 is bonded to the back of the adjacent photovoltaic cell 9. The reflection segment 1 is a triangular strip structure, and the reflection segment 1 includes a waist surface 11 for reflection and a bottom surface 12 connected to the photovoltaic cell 9. The waist surface 11 is concave with at least one groove 13 parallel to the bottom surface, and the surface of the reflection segment 1 and the back welding segment 2 is covered with a tin layer. The tin layer plays a role in reflecting light. The groove 13 parallel to the bottom surface 12 is used, and the inner wall of the groove 13 is used as a reflection surface to reflect sunlight, which can better promote the cell to absorb light; at the same time, due to the use of the groove 13 parallel to the bottom surface 12, it only needs to be stretched in the mold during production, which is convenient and efficient. At the same time, a triangular wind knife is used. After entering the tin liquid, it passes through the triangular wind knife and blows along the extension direction of the groove 13 to facilitate the blowing away of excess tin liquid, so that the shape of the groove 13 is revealed.

[0028] In one embodiment, if Figure 1-3 As shown, the back welding section 2 is flat.

[0029] In one embodiment, if Figure 1-3As shown, the groove 13 is angular. The angular groove has a first reflective surface 14 and a second reflective surface 15; since the reflective segment 1 is a triangular strip structure, one end of the first reflective surface 14 protrudes from the second reflective surface 15, so the light irradiated on the first reflective surface 14 will be reflected to the second reflective surface 15, and then reflected to the solar panel by the second reflective surface 15, so as to increase the light absorption of the solar panel.

[0030] The production steps of the triangular segmented photovoltaic welding strip of the present invention are as follows: first, the raw material is pulled through a mold to form a triangular strip structure (substrate) with grooves, and then the substrate is segmented and pressed into a flat shape by a pressing wheel, and then immersed in tin liquid to tin the surface, and finally air-dried and solidified.

[0031] The present invention also discloses a tinning device for a triangular segmented photovoltaic welding strip, such as Figure 4-8 As shown, it includes a tin pool 31, a liquid receiving pool 32, a triangular wind knife 4, a derailment detection mechanism 5, and a cooling fan 6. From right to left, the first guide wheel 71, the second guide wheel 72, the third guide wheel 73, the fourth guide wheel 74, the fifth guide wheel 75, and the sixth guide wheel 76 are arranged in sequence. The first guide wheel 71, the second guide wheel 72, the third guide wheel 73, and the fourth guide wheel 74 are in an inverted trapezoidal structure. The fifth guide wheel 75 and the sixth guide wheel 76 are higher than the fourth guide wheel 74, so that the substrate is in an inclined state, and the substrate is closely attached to the fifth guide wheel 75. Among them, the fourth guide wheel 74 and the fifth guide wheel 75 are connected to the electrode, and the substrate is short-circuited when passing through the fourth guide wheel 74 and the fifth guide wheel 75, so that the section of the substrate generates heat to avoid the solidification of the tin layer. The derailment detection mechanism 5 is divided into the inlet end and the outlet end, that is, the direction of the substrate is detected before the substrate enters the tin furnace, and the direction is detected again after the tin plating is completed, so as to ensure that the substrate is in an accurate position during the candidate treatment. The cooling fan 6 is arranged above the fifth guide wheel 75 and the sixth guide wheel 76 to cool and solidify the tin layer on the surface of the solder strip. The triangular wind knife 4 is arranged between the fourth guide wheel 74 and the fifth guide wheel 75, and the solder strip passes through the middle of the triangular wind knife 4; wherein, the triangular wind knife 4 blows out wind from three sides, blows out obliquely outward, and converges to the middle; the triangular wind knife 4 blows away the excess substrate on the surface of the solder strip. The second guide wheel 72 and the third guide wheel 73 are immersed in the tin pool 31, and a liquid receiving pool 32 is arranged below the fourth guide wheel 74 and the fifth guide wheel 75 to receive the excess tin liquid.

[0032] In the above embodiment, if Figure 4-8 As shown, in order to further prevent the substrate from derailing during movement, thereby affecting the subsequent tinning of the substrate, square guide grooves are provided on the first guide wheel 71, the fourth guide wheel 74, the fifth guide wheel 75 and the sixth guide wheel 76, and V-shaped guide grooves matching the top angles of the substrate are provided on the second guide wheel 72 and the third guide wheel 73.

[0033] In one embodiment, if Figure 4-8As shown, the derailment detection mechanism 5 includes a detection mechanism and a support mechanism, the detection mechanism includes a bracket 51, an adjustment beam 52, a swing arm 53, a tension spring 54, a spring 55, a pressure wheel 56, an adjustment bolt 57, an adjustment block 58, a slider 59 and a proximity switch 60, the adjustment beam 52 is horizontally arranged on the bracket 51, an adjustment groove 521 is arranged on the adjustment beam 52 along its length direction, and a guide rail 522 parallel to the adjustment groove is arranged on the upper surface of the adjustment beam 52. Pulleys 591 are arranged on both sides of the slider 59, and an adjustment hole is arranged on the slider, and the pulley 591 is arranged on the guide rail 522, so that there is rolling friction between the slider 59 and the adjustment beam 52, which is conducive to the horizontal movement of the slider 59 on the adjustment beam 52. The adjusting block 58 protrudes upwards and is provided with a locking block 581 and an adjusting rod 582. The adjusting rod 582 passes through the adjusting groove 521 and is vertically slidably connected with the adjusting hole. The spring 55 is sleeved on the adjusting rod 582. The two ends of the spring 55 are respectively connected with the groove 523 of the adjusting rod 582. The adjusting block 58 is vertically provided with a screw hole, and the adjusting bolt 57 cooperates with the screw hole. The swing arm 53 is rotatably provided at the lower end of the bracket 51. The pressure wheel 56 is rotatably provided at one end of the swing arm 53, and the other end is connected with the adjusting beam 52 through the tension spring 54. Through the tension of the tension spring 54, the other end of the swing arm 53 is close to the adjusting beam 52; that is, the swing arm 53 rotates counterclockwise; at the same time, the adjusting bolt 57 is rotated to adjust the distance of its lower end protruding from the lower surface of the adjusting block 58, and is close to the upper surface of the swing arm 53. The proximity switch 60 is adjustably provided on the adjusting block 58 to limit the upper limit position of the counterclockwise rotation of the swing arm 53; and the pressure wheel 56 is provided with a V-shaped groove. The above structure adjusts the upper limit position of the swing arm 53 in the following steps: rotate the adjusting bolt 57 so that its lower end is hidden in the adjusting block 58, and then press down the adjusting rod 582 so that the locking block 581 of the adjusting block 58 is separated from the locking groove 523, and the slider 59 is moved horizontally to adjust to the target position, and the adjusting rod 582 is released. The locking block 582 is inserted into the locking groove 523 by the elastic force of the spring 55 to fix the adjusting block 58. If the position is the upper limit position of the swing arm 53, there is no need to continue adjusting the adjusting bolt 57. If the upper limit position of the swing arm 53 is too high, rotate the adjusting bolt 57 so that its lower end protrudes from the adjusting block 58.

[0034] In the above embodiment, if Figure 4-8 As shown, two guide rails 522 are provided and are respectively arranged on both sides of the adjustment slot 521 .

[0035] In the above embodiment, if Figure 4-8 As shown, at least two pulleys 591 are spaced apart on each of the two opposite sides of the slider 59 .

[0036] In the above embodiment, if Figure 4-8As shown, at least two adjusting rods 582 are provided, and the positions and number of the adjusting holes correspond to the adjusting rods 582. This prevents the locking block 581 of the adjusting block 58 from rotating at an angle after it is separated from the locking groove 523.

[0037] The supporting mechanism includes a supporting frame 61 and a supporting wheel 62 . The supporting frame 61 is horizontally provided with a waist-shaped hole 611 . The supporting wheel 62 is arranged on the supporting frame 61 and is adjustably connected to the waist-shaped hole 611 .

[0038] The pressure wheel 56 is pressed on the support wheel 62 and is tangent to the horizontal plane. When the height of the substrate changes, the upper limit position of the swing arm 53 is changed by moving the adjustment block 58. Since the pressure wheel 56 changes its downward pressure position by rotating the swing arm 53, the horizontal position of the pressure wheel 56 also changes. The support wheel 62 with adjustable horizontal position is used to ensure that the pressure wheel 56 and the support wheel 62 are tangent to the horizontal plane at the same time. The specific method for the above structure to detect whether derailment occurs is that the top angle of the substrate is placed in the V-groove of the pressure wheel 56 to prevent the substrate from derailing; when the substrate is separated from the V-groove, the substrate lifts the pressure wheel 56, and the proximity switch 60 cannot sense the swing arm 53 at this time, and the equipment stops and alarms. To realize the alarm of substrate derailment. Among them, the pressure wheel 56 can be pressed on the substrate with a certain pressure, or it can be set at a distance from the substrate. In addition, since the welding ribbon is a triangular section with one end being flat, the pressure wheel 56 does not contact the substrate when it is flat, and when it reaches the emission section 1 again, it may not be able to smoothly enter the V-groove, and the welding ribbon derailment cannot be detected. The above structure does not cause the above situation. Specifically, both sides of the V-groove have flat surfaces. Therefore, even if derailment occurs, the top angle of the welding ribbon will be on the plane, and the pressure wheel 56 will be lifted in the same way, so that the proximity switch 60 sends a signal.

[0039] In one embodiment, if Figure 4-8 As shown, each side of the triangular wind knife 4 forms an angle of 10°-30° with the waist surface or bottom surface of the base.

[0040] In one embodiment, if Figure 4-8 As shown, it also includes a first baffle 81 and a second baffle 82 . The first baffle 81 is arranged above the fourth guide wheel 74 and forms an angle of 30°-60° with the horizontal plane. The second baffle 82 is vertically arranged below the fourth guide wheel 74 .

[0041] When the utility model is used, Figure 1-8As shown, according to the height of the substrate, the downward pressing position of the pressure wheel 56 is adjusted. When the solder strip cannot fall into the V-shaped groove during derailment, the pressure wheel 56 is lifted up to detect whether the substrate has derailed; the substrate is guided into the tin pool 31 by the first guide wheel 71, the second guide wheel 72 and the third guide wheel 73, and a tin layer is coated on its surface. Then, the substrate between them is short-circuited and heated by the fourth guide wheel 74 and the fifth guide wheel 75 to avoid premature solidification of the tin layer. At the same time, the excess tin liquid on the surface of the substrate is blown away by the triangular wind knife 4, and the first baffle 81 is used to drain part of the blown tin liquid into the tin pool 31, and the other part falls into the liquid receiving pool 32; the second baffle 82 is used to prevent the centrifugal force of the fourth guide wheel 74 from causing the tin liquid to be thrown to the front substrate when it rotates. Then it enters between the fifth guide wheel 75 and the sixth guide wheel 76 and is cooled and solidified by the heat dissipation fan 6. Finally, the derailment detection mechanism 5 is used to check whether derailment has occurred again.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, they should all be included in the protection scope of the claims of the present invention.

Claims

1. A tinning device for triangular segmented photovoltaic ribbons, It is characterized in that It includes a tin pool, a liquid receiving pool, a triangular wind knife, a derailment detection mechanism and a cooling fan. From right to left, a first guide wheel, a second guide wheel, a third guide wheel, a fourth guide wheel, a fifth guide wheel and a sixth guide wheel are sequentially arranged. The first guide wheel, the second guide wheel, the third guide wheel and the fourth guide wheel are in an inverted trapezoidal structure. The fifth guide wheel and the sixth guide wheel are higher than the fourth guide wheel. The derailment detection mechanism is arranged at the inlet end and the outlet end respectively. The cooling fan is arranged above the fifth guide wheel and the sixth guide wheel. The triangular wind knife is arranged between the fourth guide wheel and the fifth guide wheel. The triangular wind knife is used to blow away the excess tin liquid on the waist surface and the bottom surface. The second guide wheel and the third guide wheel are immersed in the tin pool. A liquid receiving pool is arranged below the fourth guide wheel and the fifth guide wheel. The fourth guide wheel and the fifth guide wheel are connected to electrodes so that the photovoltaic welding belt between the fourth guide wheel and the fifth guide wheel forms a short circuit. The derailment detection mechanism comprises a detection mechanism and a support mechanism, wherein the detection mechanism comprises a bracket, an adjustment beam, a swing arm, a tension spring, a spring, a pressure wheel, an adjustment bolt, an adjustment block, a slider and a proximity switch, wherein the adjustment beam is horizontally arranged on the bracket, an adjustment groove is arranged on the adjustment beam along its length direction, a guide rail parallel to the adjustment groove is arranged on the upper surface of the adjustment beam, pulleys are arranged on both sides of the slider, and an adjustment hole is arranged on the slider, the pulley is arranged on the guide rail, a locking block and an adjustment rod are arranged on the adjustment block protruding upward, and the adjustment rod passes through the adjustment groove and The adjusting hole is vertically slidably connected, the spring is sleeved on the adjusting rod and is respectively connected with the upper end of the adjusting rod and the sliding block, the lower surface of the adjusting beam is evenly spaced to provide locking grooves that cooperate with the locking block, the adjusting block is vertically provided with penetrating screw holes, the adjusting bolts cooperate with the screw holes, the swing arm is rotatably provided at the lower end of the bracket, the pressure wheel is rotatably provided at one end of the swing arm, and the other end is connected with the adjusting beam through a tension spring, and the proximity switch is adjustably provided on the adjusting block; a V-shaped groove is provided on the pressure wheel, and planes are provided on both sides of the V-shaped groove; The support mechanism comprises a support frame and a support wheel, the support frame is horizontally provided with a waist-shaped hole, and the support wheel is arranged on the support frame and is adjustably connected to the waist-shaped hole; The pressing wheel is pressed on the supporting wheel and is tangent to the horizontal plane.

2. A tinning device for a triangular segmented photovoltaic ribbon according to claim 1, It is characterized in that The first guide wheel, the fourth guide wheel, the fifth guide wheel and the sixth guide wheel are provided with square guide grooves, and the second guide wheel and the third guide wheel are provided with V-shaped guide grooves matching the top angles of the photovoltaic welding strips.

3. The tinning device for a triangular segmented photovoltaic ribbon according to claim 1, It is characterized in that Each side wind of the triangular wind knife forms an angle of 10°-30° with the waist surface or the bottom surface.

4. The tinning device for a triangular segmented photovoltaic ribbon according to claim 1, It is characterized in that It also includes a first baffle and a second baffle, wherein the first baffle is arranged above the fourth guide wheel and forms an angle of 30°-60° with the horizontal plane, and the second baffle is vertically arranged below the fourth guide wheel.

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