Busbar providing module, busbar welding system and method thereof, photovoltaic module

Abstract

The present invention discloses a busbar providing module, a busbar welding system and method thereof, and a photovoltaic module. The busbar providing module includes: a busbar; a busbar positioning device, the busbar positioning device includes a first magnetic element, the first magnetic element is multiple and is arranged at intervals along the length direction of the busbar, and the multiple first magnetic elements are respectively matched with the busbar limiter; a first transportation device, the first transportation device is movable, and the first transportation device is provided with a second magnetic element, and the first magnetic element and the second magnetic element are magnetically matched to enable the first transportation device to operate the busbar and the busbar positioning device. Thereby, the precise control of the position of the busbar during placement and transportation is effectively achieved, and the welding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and in particular to a busbar providing module, a busbar welding system and method thereof, and a photovoltaic module. Background Art

[0002] In the existing photovoltaic module production process, the busbars are transported by rubber suction nozzles, and then transported to the head, tail and middle parts of the module by a robot, and then welded to the welding strips on the battery strings in the photovoltaic module by hot air blowing. The problem is that with the development of photovoltaic module technology, the current busbar width has gradually been reduced from the original 8mm to 4mm, and the size of the rubber suction nozzle has also been greatly reduced. The suction force is small because the suction nozzle is small, and the busbar will move or fall directly during the transportation process, resulting in deviation or failure of the busbar welding; during the hot air welding process, it is easy to blow the tin slag from the previous welding and the surrounding dust onto the battery string. After the photovoltaic module is produced, all foreign matter is made into the photovoltaic module, which seriously affects the quality of the photovoltaic module.

[0003] Therefore, how to improve the handling and welding of busbars during the production of photovoltaic modules is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention aims to provide a busbar providing module, a busbar welding system and method thereof, and a photovoltaic module.

[0005] A first aspect of the present invention discloses a busbar providing module, comprising:

[0006] Busbars;

[0007] A busbar positioning device, the busbar positioning device comprises a first magnetic element, the first magnetic elements are multiple and are arranged at intervals along the length direction of the busbar, and the multiple first magnetic elements are respectively matched with the busbar limit position;

[0008] The first transport device is movable and is provided with a second magnetic element. The first magnetic element and the second magnetic element cooperate with each other by magnetic attraction, so that the first transport device can operate the busbar and the busbar positioning device.

[0009] By arranging corresponding magnetic elements on the busbar positioning device and the busbar transporting device, accurate control of the position of the busbar during placement and operation can be effectively guaranteed, thereby effectively improving the welding quality.

[0010] Furthermore, a groove is provided on the first magnetic element, and in the length direction of the bus bar, two ends of the groove respectively penetrate the first magnetic element, and the bus bar is limitedly matched with the grooves of the plurality of first magnetic elements.

[0011] Further, the depth of the groove is greater than or equal to the thickness of the bus bar.

[0012] Furthermore, the second magnetic element is an electromagnet.

[0013] A second aspect of the present invention discloses a busbar welding system, comprising:

[0014] A first aspect of the present invention discloses a busbar providing module;

[0015] A battery string providing module; the battery string providing module comprises a battery string and a second transport device, a plurality of welding strips are arranged at one end of the battery string, the plurality of welding strips are arranged at intervals along the extension direction of the battery string, the welding strips are suitable for welding with the bus bar, and the second transport device is used for transporting the battery string;

[0016] Welding module; the welding module includes a welding assembly, which can be moved to a first set position for welding the bus bar and the welding ribbon located at the welding position, where the bus bar and the welding ribbon are in contact.

[0017] Furthermore, the welding module further comprises: a supporting device; the supporting device comprises a supporting plate, and the supporting plate can be moved to a welding position for supporting the bus bar and the welding strip.

[0018] Furthermore, a through hole is formed on the support plate, and the through hole penetrates the support plate along the thickness direction of the support plate, and each first magnetic element is respectively matched with a corresponding through hole, so that the support plate is supported at the bottom of the bus bar. Furthermore, the welding module also includes a collection device, and the collection device includes:

[0019] The collecting tray can be moved to a second setting position to collect the tin slag generated by the welding of the bus bar and the welding strip. In the second setting position, the collecting tray is located below the welding position.

[0020] Further, the welding assembly comprises:

[0021] substrate;

[0022] An electric soldering iron head, which is fixed to the base plate and used for soldering the bus bar and the soldering ribbon, and the base plate is located on the upper part of the electric soldering iron head;

[0023] A pressing device, which is disposed on the substrate and is used to press the busbar and the welding strip;

[0024] The pressing device is movably connected to the substrate. The pressing device is configured to abut against the bus bar when the welding assembly moves to the third setting position, and the pressing device always abuts against the bus bar when the welding assembly moves between the third setting position and the first setting position.

[0025] Furthermore, the pressing device comprises:

[0026] A sliding rod, the sliding rod and the base plate slide and cooperate along the length direction of the sliding rod;

[0027] A pressure head, which is arranged at one end of the length of the slide rod and is suitable for abutting against the bus bar;

[0028] The elastic element is sleeved outside the sliding rod and stops between the base plate and the pressing head. The elastic element often pushes the pressing head to move in a direction away from the base plate.

[0029] By adopting the above-mentioned busbar welding system, on the one hand, the busbar providing module can accurately control the position of the busbar during placement and operation, so that the busbar will not be offset; on the other hand, the welding device uses an electric soldering iron head to weld to avoid the risk of foreign matter or tin slag flying into the battery string due to hot air; and a pressing device is used to press the busbar and the welding strip throughout the process to ensure that the two will not shift; furthermore, a supporting device is provided to ensure that the busbar and the welding strip are flat during the welding process; in addition, a collecting device is provided to collect magnetic components, foreign matter and tin slag to ensure the environment within the factory.

[0030] The third aspect of the present invention discloses a busbar welding method, which adopts the busbar welding system disclosed in the second aspect of the present invention, and comprises the following steps:

[0031] (1) Pull and cut the busbar to a set length, and fit the busbar to the busbar positioning module, so that the second magnetic element and the first magnetic element are magnetically engaged so that the first transport device drives the engaged busbar and the busbar positioning device to move to a welding position;

[0032] (2) The second transport device drives the battery string to move to a welding position, where each first magnetic element is disposed between two adjacent welding strips;

[0033] (3) The welding assembly moves to a first set position and welds the bus bar and the welding ribbon.

[0034] Further, the welding assembly comprises: a substrate; an electric soldering iron head, the electric soldering iron head is fixedly arranged on the substrate and used for welding the bus bar and the welding strip, and the substrate is located on the upper part of the electric soldering iron head; a pressing device, the pressing device is arranged on the substrate and used for pressing the bus bar and the welding strip; the pressing device is movably connected to the substrate, the pressing device is configured to stop against the bus bar when the welding assembly moves to the third set position, and when the welding assembly moves between the third set position and the first set position, the pressing device always stops against the bus bar; the welding step in step (3) comprises:

[0035] The welding assembly moves to the third setting position so that the pressing device stops against the bus bar, and the welding assembly continues to move to the first setting position to weld the bus bar and the welding strip;

[0036] After welding is completed, the welding assembly moves to between the first set position and the third set position, so that the electric soldering iron tip is separated from the bus bar, and the pressing device is still stopped against the bus bar;

[0037] After a period of time, the welding assembly moves until the pressing device is separated from the bus bar.

[0038] Furthermore, the welding module also includes: a supporting device; the supporting device includes a supporting plate, and the supporting plate can be moved to a welding position for supporting the bus bar and the welding strip; in step (1): before the bus bar, the bus bar positioning device and the battery string are moved to the welding position, the supporting plate is moved to the welding position, and then the battery string is moved onto the supporting plate; the welding method also includes the step of: after the welding is completed, the supporting plate leaves the welding position.

[0039] Furthermore, the second magnetic element in the first transport device is an electromagnet. In step (1), the electromagnet is energized so that the electromagnet and the first magnetic element are magnetically attracted to each other. The welding method further includes:

[0040] Step: after welding is completed, the electromagnet is powered off, so that the electromagnet and the first magnetic element are disengaged.

[0041] Furthermore, the welding module also includes a collecting device, which includes: a collecting plate; the collecting plate can be moved to a second set position to collect tin slag generated by welding the bus bar and the welding strip, and in the second set position, the collecting plate is located below the welding position; in step (1), the collecting plate moves to the second set position; the welding method also includes the step of: after welding is completed, the collecting plate leaves the second set position.

[0042] The above-mentioned welding method can realize accurate welding of the bus bar and the welding strip, and can prevent foreign matter or tin slag from flying and falling onto the battery string, thereby effectively improving the welding quality.

[0043] The fourth aspect of the present invention discloses a photovoltaic module, including a battery string and a bus bar, wherein the battery string and the bus bar are prepared by the bus bar welding method disclosed in the third aspect of the present invention. The photovoltaic module prepared by the above welding method has good welding quality of the bus bar and the welding strip, no false welding, welding position deviation, and good welding quality.

[0044] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a structural schematic diagram of an embodiment of a busbar providing module;

[0046] Figure 2 is a schematic structural diagram of an embodiment of a first magnetic element;

[0047] Figure 3 is a schematic diagram of positioning of the bus bar and the first magnetic element;

[0048] Figure 4 It is a module schematic diagram of the busbar welding system;

[0049] Figure 5 is a structural schematic diagram of an embodiment of a battery string providing module;

[0050] Figure 6 is a schematic structural diagram of an embodiment of a welding assembly;

[0051] Figure 7 is a schematic diagram of an embodiment of a bus bar, a bus bar positioning device and a welding ribbon placement position;

[0052] Figure 8 is a structural schematic diagram of an embodiment of a support plate;

[0053] Fig. 9 is a schematic structural diagram of an embodiment of a collecting tray;

[0054] Fig.10 is a flow chart of one embodiment of a busbar welding method;

[0055] Fig.11 is a flow chart of one embodiment of a welding method;

[0056] Fig.12 is a flow chart of another embodiment of a busbar welding method;

[0057] Fig.13 is a flow chart of another embodiment of a busbar welding method;

[0058] Fig.14 is a flow chart of another embodiment of a busbar welding method;

[0059] Reference numerals:

[0060] The bus bar provides module 1;

[0061] Bus bar 11;

[0062] Busbar positioning device 12, first magnetic element 121; groove 1211;

[0063] A first transport device 13, a second magnetic element 131;

[0064] The battery string provides a module battery string 21; a welding strip 211;

[0065] Welding assembly 31;

[0066] Electric soldering iron head 311; Electric soldering iron head lower end surface 311a;

[0067] Pressing device 312; pressing head 3121, pressing head lower end surface 3121a;

[0068] Sliding rod 3122, nut 3122a;

[0069] Elastic element 3123;

[0070] substrate 313;

[0071] Support plate 32; body 321, through hole 322;

[0072] Collection device 33; collection tray 331. DETAILED DESCRIPTION

[0073] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0074] In the description of the present invention, it should be understood that the terms "length", "thickness", "upper", "lower", "horizontal", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] Please refer to the following Figure 1-3 A busbar providing module disclosed in a first aspect of the present invention is described.

[0077] like Figure 1 The busbar providing module 1 of the present invention comprises:

[0078] Bus bar 11;

[0079] The busbar positioning device 12 includes a first magnetic element 121. The first magnetic elements 121 are multiple and are arranged at intervals along the length direction of the busbar 11. The multiple first magnetic elements 121 are respectively limited and matched with the busbar 11;

[0080] The first transport device 13 is movable. The first transport device 13 is provided with a second magnetic element 131. The first magnetic element 121 and the second magnetic element 131 are magnetically coupled to each other so that the first transport device 13 can operate the bus bar 11 and the bus bar positioning device 12. That is, when the first magnetic element 121 and the second magnetic element 131 are magnetically coupled to each other, the first transport device 13 can drive the bus bar 11 and the bus bar positioning device 12 to move so as to realize the operation of the bus bar 11.

[0081] It should be noted that the "movable" involved in the function of the device in this application refers to the ability to move up and down, forward and backward, and / or to lift, lower and rotate. For example, it can be achieved by using a robot or directly connecting to a motor to complete any movement of an object from one place to another.

[0082] The busbar is generally a long thin strip with a regular shape and a width of about 4 mm. Due to its light weight and narrow width, the busbar will be moved or dropped when it is operated with a rubber suction nozzle. By providing a busbar positioning device and confining the busbar in the positioning device, it can be ensured that the busbar will not move relative to the busbar positioning device. By setting corresponding magnetic elements in the busbar positioning device and the first transport device, the first transport device can be a robotic arm with magnetic elements, and the magnetic elements can be fixed to the robotic arm by screws or welding. It can further ensure that the busbar positioning device is effectively adsorbed on the first transport device and accurately operated, thereby achieving precise control of the placement position and operating position of the busbar.

[0083] Among them, Figure 2-3 As shown, the first magnetic elements 121 are multiple and spaced apart along the length direction of the bus bar 11. The length of the bus bar 11 is generally greater than 80 mm. The use of multiple spaced magnetic elements can better support and position the bus bar 11, ensuring that the position of the bus bar 11 will not shift; the multiple first magnetic elements 121 are respectively limited and matched with the bus bar 11; the bus bar 11 can be placed more accurately in the first magnetic element 121; the limited matching method can be, for example, Figure 2-3As shown, a groove 1211 is provided on the first magnetic element 121. In the length direction of the busbar 11, both ends of the groove 1211 respectively penetrate the first magnetic element 121, and the busbar 11 is limitedly matched with the grooves 1211 of the plurality of first magnetic elements 121. The object of the first magnetic element 121 can be a cylinder, a cuboid, a cube, a quasi-cylindrical shape, etc. The groove 1211 penetrating through the first magnetic element 121 is provided, and the groove 1211 can be used to carry the busbar 11. The groove 1211 is limitedly matched with the busbar 11. For example, the width of the busbar 11 can be equal to the width of the groove 1211, so that the busbar 11 can be prevented from being offset in the groove 1211, and the precise positioning of the busbar 11 is further achieved.

[0084] Furthermore, if Figure 3 As shown, the depth of the groove 1211 is greater than or equal to the thickness of the busbar 11, and the thickness of the busbar 11 is less than or equal to the depth of the groove 1211. The busbar 11 can be completely placed in the groove 1211, avoiding the risk of the busbar 11 being too much higher than the groove 1211 and subsequently deviating from the groove 1211.

[0085] It should be noted that in the present application, positioning the bus bar by opening a groove in the first magnetic element is only one way to implement the bus bar positioning. Other implementations, such as providing a positioning pin on the top of the first magnetic element 121 and limiting the bus bar 11 within the positioning pin, all fall within the protection scope of the present technical solution.

[0086] In some specific embodiments, the second magnetic element 131 is an electromagnet; when the electromagnet is powered on, the electromagnet can magnetically attract and cooperate with the first magnetic element 121; when the electromagnet is powered off, the electromagnet and the first magnetic element 121 are disengaged. By setting the second magnetic element 131 as an electromagnet, after the bus bar 11 is transported to a suitable position, the first magnetic element 121 can be more conveniently and quickly separated from the bus bar 11 by utilizing the characteristics of the electromagnet.

[0087] Of course, the first magnetic element 121 can also be a permanent magnet. In this case, when the distance between the first magnetic element 121 and the second magnetic element 131 is relatively close, the first magnetic element 121 and / or the second magnetic element 131 will overcome the external force, so that the first magnetic element 121 and the second magnetic element 131 are magnetically attracted to each other; when the first magnetic element 121 and the second magnetic element 131 need to be separated, a force can be applied to the first magnetic element 121 and / or the second magnetic element 131 to overcome the magnetic attraction between the first magnetic element 121 and the second magnetic element 131, so as to separate the first magnetic element 121 and the second magnetic element 131.

[0088] In summary, by providing a busbar positioning device, and providing corresponding magnetic elements on the busbar positioning device and the first transport device, the precise control of the position of the busbar during placement and operation can be effectively guaranteed, laying the foundation for further controlling the welding quality of the busbar and the welding strip.

[0089] Please refer to the following Figure 4-8 A busbar welding system disclosed in a second aspect of the present invention is described.

[0090] like Figure 4-9 As shown, the busbar welding system of the present invention comprises:

[0091] A busbar providing module 1 disclosed in a first aspect of the present invention;

[0092] A battery string providing module; the battery string providing module comprises a battery string 21 and a second transport device, a plurality of welding strips 211 are provided at one end of the battery string 21, the plurality of welding strips 211 are arranged at intervals along the extension direction of the battery string 21, the welding strips 211 are suitable for welding with the bus bar 11, and the second transport device is used to transport the battery string 21;

[0093] Welding module; the welding module includes a welding assembly 31, which can be moved to a first set position for welding the bus bar 11 and the welding strip 211 located at the welding position, where the bus bar 11 and the welding strip 211 are in contact.

[0094] During the welding process, the battery string 21 is moved to the welding position by the second transport device. The second transport device can be a mechanical arm with a suction cup. The structure and principle of the second transport device are well known to those skilled in the art and will not be repeated here. A plurality of welding strips 211 are arranged at intervals along the extension direction of the battery string 21; the first transport device 13 moves the bus bar 11 and the bus bar positioning device 12 to the top of the welding strip 211 of the battery string 21, and the bus bar positioning device 12 is arranged between the two welding strips 211; the bus bar 11 contacts the welding strip 211; the welding module lowers the welding assembly 31 to the first set position, and the first set position is the welding assembly 3 1 is a position where the welding assembly is welded. At the first set position, the welding assembly 31 welds the bus bar 11 and the welding strip 211 that have been in contact with each other. During this process, on the one hand, the bus bar positioning device 12 accurately places the bus bar 11 without any deviation; on the other hand, the second magnetic element 131 on the first transport device 13 attracts the first magnetic element 121 on the bus bar positioning device 12 to position the bus bar 11, ensuring that the bus bar 11 will not deviate during the welding process; thereby ensuring that the welding position of the bus bar 11 and the welding strip 211 will not be deviated during the welding process, effectively ensuring the welding quality of the bus bar 11 and the welding strip 211.

[0095] In some specific embodiments, Figure 8As shown, the welding module further includes a support plate device, which includes a support plate 32, and the support plate 32 can be moved to a welding position to support the bus bar 11 and the welding strip 211. During the welding process, the welding strip 211 and the bus bar 11 are transferred to the support plate 32 for welding, and the bus bar 11 and the welding strip 211 are supported by the support plate 32, which further ensures the welding quality.

[0096] It can be understood that the "support plate" involved in the support plate 32 in the present application only needs to ensure that the upper end surface is flat, and its shape is not limited. It can be a regular or irregular rectangular, cube or polygonal plate, etc. Technical personnel in this field can arbitrarily set it according to the space of the device, which all fall within the scope of protection of the present application.

[0097] The support plate 32 includes a body 321, and a through hole 322 is formed on the body 321. The through hole 322 penetrates the support plate 32 along the thickness direction of the support plate 32. Each first magnetic element 121 is respectively matched with the corresponding through hole 322, so that the support plate 32 is supported on the bottom of the bus bar 11. When the first magnetic element 121 carries the bus bar 11 and is transported to the support plate 32, since the first magnetic element 121 has a certain thickness, if it is directly placed on the support plate 32, it may cause a certain gap between the bus bar 11 and the support plate 32, and it cannot contact with the welding strip 211. By providing a through hole 322 penetrating the support plate 32, the first magnetic element 121 can be placed in the through hole 322 of the support plate 32, thereby ensuring that the bus bar 11 can be in close contact with the welding strip 211. Each first magnetic element 121 is respectively matched with the corresponding through hole 322. When the welding is completed, the bus bar 11 is welded to the battery string 21, and the battery string 21 and the bus bar 11 are transported together, the first magnetic element 121 is separated from the bus bar 11. The first magnetic element can be directly separated from the bus bar 11 from the through hole 322 in the support plate 32 and fall from the through hole 322, thereby completing the recovery of the first magnetic element 121.

[0098] In some specific embodiments, Fig. 9As shown, the welding module also includes a collecting device 33, and the collecting device 33 includes: a collecting plate 331; the collecting plate 331 can be moved to a second set position to collect the tin slag and / or the first magnetic element 121 generated by the welding of the bus bar 11 and the welding strip 211. In the second set position, the collecting plate is located below the welding position. The upper end surface of the collecting plate 331 has an opening 332, which can be used to collect objects dropped during the welding process. By setting the collecting plate 331, on the one hand, during the welding process, there will be tin slag falling. The collecting plate 331 is used to collect the tin slag, which can maintain the environmental hygiene in the photovoltaic module and prevent foreign objects from being blown onto the photovoltaic module. On the other hand, when the first magnetic element 121 is separated from the bus bar 11, the collecting plate 331 is used to collect the first magnetic element 121 to achieve the recovery of the magnetic element.

[0099] In some specific embodiments, Figure 6 As shown, the welding assembly 31 includes:

[0100] substrate 313;

[0101] An electric soldering iron head 311, which is fixed to a substrate 313 and is used for soldering the bus bar 11 and the soldering ribbon 211, and the substrate 313 is located on the upper part of the electric soldering iron head 311;

[0102] A pressing device 312 , which is disposed on the substrate 313 and is used to press the bus bar 11 and the welding ribbon 211 ;

[0103] The pressing device 312 is movably connected to the base plate 313. The pressing device 312 is configured to abut against the bus bar 11 when the welding assembly 31 moves to the third set position, and the pressing device 312 always abuts against the bus bar 11 when the welding assembly 31 moves between the third set position and the first set position.

[0104] Generally, the soldering iron tip 311 is a long columnar structure, for example, it can be a cuboid, a polygon, a rectangle, a cylinder or a cone; the soldering iron tip 311 is fixed on the substrate 313, for example, it can be directly connected to the substrate 313 as a whole to form an inverted T structure. More preferably, the soldering iron tip 311 and the substrate 313 are detachably connected, and the soldering iron tip 311 and the substrate 313 can be detachably connected in various ways, for example, it can be a threaded connection, the upper end face of the soldering iron tip 311 is provided with an external thread, the center position of the lower end face of the substrate 313 is provided with a groove, the groove is provided with an internal thread, and the soldering iron tip 311 and the substrate 313 are connected by threads; or the soldering iron tip 311 and the substrate 313 are connected by a tenon, etc.

[0105] The bus bar 11 and the welding ribbon 211 are welded by using the electric soldering iron tip 311, which can avoid the use of hot air welding, which has the risk of foreign matter being blown onto the photovoltaic module and affecting the quality of the photovoltaic module.

[0106] The pressing device 312 is arranged on the substrate 313, and the pressing device 312 is arranged around the electric soldering iron head 311. The pressing device 312 is movably connected to the substrate 313. The pressing device 312 is configured to stop with the bus bar 11 when the welding assembly 31 moves to the third setting position. The third setting position is the position of the welding assembly when the pressing device contacts the bus bar; when the lower end surface 312a of the pressing device 312 is flush with the lower end surface 311a of the electric soldering iron head 311, the first setting position is the same as the third setting position; when the lower end surface 312a of the pressing device 312 is lower than the lower end surface 311a of the electric soldering iron head 311, the third setting position is higher than the first setting position. When the connecting assembly descends, the pressing device 312 first contacts the busbar and reaches the third set position, and then the welding assembly 31 is further descended, and the soldering iron head 311 contacts the busbar 11 and reaches the first set position. The soldering iron head 311 welds the busbar 11 and the welding strip 211. At this time, the pressing device always presses the busbar 11 to press and fix the busbar 11. When the soldering iron head 311 completes the welding, the soldering iron head 311 leaves the busbar 11 first, and the substrate 313 rises relative to the pressing device 312, while the pressing device 312 still presses the busbar 11. After the tin cools down, the substrate 313 rises again, so that the pressing device 312 leaves the busbar 11.

[0107] In a specific embodiment, the pressing device 312 includes a sliding rod 3122, which slides and cooperates with the substrate along the length direction of the sliding rod 3122; a pressing head 3121, which is arranged at one end of the length of the sliding rod 3122 and is suitable for abutting against the bus bar 11; and an elastic element 3123, which is sleeved outside the sliding rod 3122 and abuts between the substrate 313 and the pressing head 3121. The elastic element 3123 often pushes the pressing head 3121 to move in a direction away from the substrate 313, so that the elastic element 3123 can always be in a compressed state to apply an elastic force to the pressing head 3121, so that the pressing head 3121 has a tendency to move in a direction away from the substrate 313. In a specific embodiment, the pressure head 3121 is a long columnar body, which can be a cuboid, a polygon, a rectangle, a cylinder or a cone. The sliding rod 3122 is arranged above the pressure head 3121. The sliding rod 3122 is a cylinder. The sliding rod 3122 and the pressure head 3121 can be integrated or detachably connected, for example, they can be threaded. In a specific embodiment, a hole penetrating the sliding rod 3122 is provided on the base plate 313. The diameter of the sliding rod 3122 is smaller than the hole. The sliding rod 3122 can move relative to the base plate 313. The upper end of the sliding rod 3122 The surface is provided with an external thread, which is connected to the nut 3122a. The outer diameter of the nut 3122a is larger than the hole, so that the sliding rod 3122 will not fall out of the hole as the substrate 313 rises; the elastic element 3123, such as a spring sleeve, is arranged outside the sliding rod 3122, and the diameter of the lower end surface of the sliding rod 3122 is smaller than the diameter of the upper end surface of the pressure head 3121. The diameter of the elastic element 3123 is larger than the diameter of the sliding rod 3122 and smaller than the diameter of the pressure head 3121. The elastic element 3123 can be extended and compressed on the sliding rod, and stop between the substrate 313 and the pressure head 3121.Therefore, during the welding process, when the welding assembly 31 descends, since the lower end surface of the pressing head 3121 in the pressing device is lower than the lower end surface of the electric soldering iron head 311, the pressing head 3121 first contacts the bus bar 11, reaches the third set position, and presses the bus bar 11. When the welding assembly 31 is further lowered, the lower end surface of the pressing head 3121 is fixed at this time. If it continues to descend, the substrate 313 presses the elastic element 3123 to descend relative to the sliding rod 3122, and the electric soldering iron head 311 is lowered. The installation of the elastic element 3123 buffers the force applied by the substrate 313 on the pressing head 3121. The soldering iron tip 311 is evenly applied to each pressure head 3121 until the soldering iron tip 311 reaches the first set position and contacts the busbar 11 and the soldering strip 211. After soldering is completed, the soldering iron tip 311 rises and drives the substrate 313 to rise. At this time, there is a long distance between the nut 3122a and the substrate 313. The elastic element 3123 stretches, and the elastic force generated by it causes the substrate 313 to rise relative to the pressure head 3121, but the position of the pressure head 3121 does not change. The pressure head 3121 continues to press the busbar 11, and further lifts the substrate 313, so that the substrate 313 contacts the nut 3122a. If the elastic element 3123 does not stretch, the substrate 313 rises together with the pressure head 3121, and the pressure head 3121 is away from the busbar 11. Therefore, through the design of the sliding rod 3122, the pressure head 3121 and the elastic element 3123, the pressing device can always press the bus bar 11 when the soldering iron tip 311 contacts the bus bar 11 or after the soldering iron tip 311 moves away from the bus bar 11, so that the distance between the bus bar 11 and the soldering strip 211 will not shift, and it can be ensured that the tin is always between the bus bar 11 and the soldering strip 211 during the entire cooling process, thereby avoiding tin flow and causing cold solder joints.

[0108] Furthermore, there are multiple pressing devices 312 and they are symmetrically arranged around the electric soldering iron head 311; the multiple pressing devices 312 are two or more. By evenly and symmetrically arranging the pressing devices 312, the uniformity of the pressing force is ensured, and the welding quality is improved.

[0109] Further, the pressure head 3121 is a cone, and optionally, the diameter of the bottom of the pressure head 3121 is 0.5 mm to 4 mm, for example, it can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm. The pressure head 3121 is set to be a cone, and the diameter of the pressure head 3121 is less than or equal to the width of the bus bar 11. The pressure head 3121 can be completely placed on the bus bar 11, ensuring that the contact position of the pressure head 3121 is flat, further improving the quality of welding.

[0110] In summary, the above busbar welding system can provide the module with precise control over the placement and position of the busbar during operation, so that the busbar will not be offset. On the other hand, the welding device uses a soldering iron head to avoid the risk of foreign matter or tin slag flying into the battery string due to hot air. A pressing device is used to press the busbar and the soldering strip throughout the process to ensure that the two will not be offset, and there will be no gap between the busbar and the soldering strip before the tin cools down, resulting in cold solder joints or unwelded parts. A support plate is provided to ensure that the busbar and the soldering strip are flat during the welding process. In addition, a collection device is provided to collect magnetic components, foreign matter and tin slag to ensure the environment in the factory.

[0111] Please refer to the following Figure 10-14 A busbar welding method disclosed in the third aspect of the present invention is described, using any busbar welding system disclosed in the second aspect of the present invention, such as Fig.10 As shown, the busbar 11 welding method comprises the following steps:

[0112] (1) Pull and cut the busbar 11 to a set length, and fit the busbar 11 to the busbar positioning module 12. The second magnetic element 131 and the first magnetic element 121 are magnetically engaged so that the first transport device 13 drives the engaged busbar 11 and the busbar positioning device 12 to move to a welding position;

[0113] (2) The second transport device drives the battery string 21 to move to the welding position. At the welding position, each first magnetic element 121 is disposed between two adjacent welding strips 11;

[0114] (3) The welding assembly 31 moves to the first set position and welds the bus bar 11 and the welding ribbon 211 .

[0115] It is understandable that there is no particular order for steps (1) and (2). They can be performed simultaneously, or step (1) can be performed first, or step (2) can be performed first.

[0116] Before welding, the busbar 11 is first pulled and cut to the required length, and the busbar 11 is positioned on the busbar positioning module 12. Then the battery string 21 is moved to the welding position. Subsequently, the busbar 11 and the busbar positioning device 12 are moved to the top of the welding strip 211 and contact the welding strip 211. The first magnetic element 121 is also moved to the welding position. Since the first magnetic element 121 has a certain thickness, the first magnetic element 121 should avoid contacting the welding strip 211, resulting in the busbar 11 placed on or inside the first magnetic element 121 not being able to contact the welding strip 211. Therefore, if Figure 7 As shown, the first magnetic element 121 is disposed at intervals between the two welding strips 211. Finally, the welding assembly 31 is moved to the first set position for welding.

[0117] The above-mentioned busbar welding method can ensure that the busbar and the welding strip will not shift in position during the welding process, achieve precise welding, and prevent foreign matter or tin slag from flying and falling into the photovoltaic module, thereby effectively improving the welding quality.

[0118] In some specific embodiments, the welding assembly 31, as disclosed in the second aspect of the present invention, includes a substrate 313; an electric soldering iron head 311, the electric soldering iron head 311 is fixedly arranged on the substrate 313 and is used to weld the bus bar 11 and the welding strip 211, and the substrate 313 is located at the upper part of the electric soldering iron head 311; a pressing device 312, the pressing device 312 is arranged on the substrate 313, and is used to press the bus bar 11 and the welding strip 211; the pressing device 312 is movably connected to the substrate 313, and the pressing device 312 is configured to stop against the bus bar 11 when the welding assembly 31 moves to the third set position, and when the welding assembly 31 moves between the third set position and the first set position, the pressing device 312 always stops against the bus bar 11, such as Fig.11 As shown, the welding steps in step (3) are:

[0119] The welding assembly 31 moves to the third setting position so that the pressing device 312 stops against the bus bar 11 , and the welding assembly 31 continues to move to the first setting position to weld the bus bar 11 and the welding strip 211 ;

[0120] After welding is completed, the welding assembly 31 moves to between the first setting position and the third setting position, so that the electric soldering iron tip 311 is separated from the bus bar 11, and the pressing device 312 is still stopped against the bus bar;

[0121] After a period of time, the welding assembly 31 moves until the pressing device 312 is separated from the bus bar 11 .

[0122] Before welding, the busbar 11 is first pressed by the pressing device 312; then the welding assembly 31 is lowered for welding. During the entire welding process, the pressing device 312 always presses the busbar 11, effectively avoiding the displacement of the busbar 11 or the welding strip 211, ensuring the welding quality, and avoiding the occurrence of cold welding. After welding is completed, as the welding assembly 31 rises, the electric soldering iron tip 311 is separated from the busbar 11. At this time, the tin has not cooled down, and the electric soldering iron tip 311 is relatively hot and not suitable for pressing. At this time, the pressing device 312 is still pressing the busbar 11 for a period of time, for example, 1-10 seconds, 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, 10 seconds. After the tin cools down, the pressing device 312 leaves again, effectively ensuring the quality of welding.

[0123] Furthermore, there are multiple pressing devices 312 and they are symmetrically arranged around the electric soldering iron head 311; the multiple pressing devices 312 are two or more. The pressing devices 312 are symmetrically arranged around the electric soldering iron head 311, which ensures uniform pressing force and further ensures welding quality.

[0124] In some specific embodiments, the welding module, as disclosed in the second aspect of the present invention, comprises a support plate device, the support plate device comprises a support plate 32, the support plate 32 can be moved to a welding position for supporting the bus bar 11 and the welding strip 211, wherein Fig.12 As shown, in step (1): before the busbar 11, the busbar positioning device 12 and the battery string 21 are moved to the welding position, the support plate 32 is moved to the welding position, and then the battery string 21 is moved onto the support plate 31. The battery string 21 and the busbar 11 are welded using the support plate 32, so that during the welding process, the busbar 11 and the bottom of the welding strip 211 are stressed, and the welding force of the electric soldering iron tip during the welding process does not cause the busbar 11 and the welding strip 211 to deviate; in addition, the welding method also includes the step of: after the welding is completed, the support plate 32 is transported out of the welding position.

[0125] In some specific embodiments, the second magnetic element 131 in the first transport device 13 is an electromagnet. Fig.13 As shown, in step (1): the electromagnet is energized so that the electromagnet and the first magnetic element 121 are magnetically coupled;

[0126] In this step, the first transport device 13 for operating the busbar 11 and the busbar positioning device 12 is an electromagnet. When the busbar 11 and the busbar positioning device 12 need to be operated, the electromagnet is energized, and the electromagnet attracts the busbar positioning device 12 and the busbar 11 positioned on the busbar positioning device 12. The first transport device 13 operates the busbar 11 and the busbar positioning device 12 to above the welding strip 211 at the welding position, and contacts the welding strip 211. The first magnetic element 121 is spaced between the two welding strips 211.

[0127] In addition, if Fig.13 As shown, the step of: after welding is completed, the electromagnet is powered off so that the electromagnet is disengaged from the first magnetic element 121.

[0128] In this step, after welding is completed, the electromagnet is powered off, the electromagnet loses its magnetism, the first magnetic element 121 is no longer attracted, and is separated from the first transport device 13 and recovered.

[0129] In some specific embodiments, a through hole 322 is provided on the support plate. During the entire welding process, the first magnetic element 121 is placed in the through hole 322 of the support plate 32. When the first magnetic element 121 is no longer attracted by the electromagnet and is separated from the electromagnet, it will fall through the through hole 322, thereby realizing the simple and convenient recovery of the first magnetic element 121.

[0130] In some specific embodiments, the welding module, as disclosed in the second aspect of the present invention, includes a collecting device 33, and the collecting device 33 includes: a collecting plate 331; the collecting plate 331 can be moved to a second set position to collect the tin slag and / or the first magnetic element 121 generated by the welding of the bus bar 11 and the welding strip 211. In the second set position, the collecting plate is located below the welding position, wherein, Fig.14 As shown,

[0131] In step (1): the collecting tray 331 is moved to a second set position so that the collecting tray 331 is located below the welding position;

[0132] In addition, the method will also include the step of transporting the collecting tray 331 out of the second set position of the welding position to facilitate cleaning and maintenance of the collecting tray 331 .

[0133] As described above, by providing the collection tray 331 and arranging the collection tray 331 below the welding position, on the one hand, during the welding process, tin slag will fall, and the collection tray 331 can be used to collect the tin slag, so as to maintain the environmental hygiene in the photovoltaic module and prevent foreign matter from being blown onto the photovoltaic module. On the other hand, when the first magnetic element 121 is separated from the bus bar 11, the collection tray 331 can be used to collect the first magnetic element 121 to achieve the recovery of the magnetic element.

[0134] It is understandable that in this step (1), there is no particular order in which the battery string 21 or the collection tray 331 can be transported. They can be transported simultaneously, or the battery string 21 can be transported first, or the collection tray 331 can be transported first.

[0135] The fourth aspect of the present invention discloses a photovoltaic module, including a battery string and a bus bar, wherein the battery string and the bus bar are prepared by the bus bar welding method disclosed in the third aspect of the present invention. The photovoltaic module has good welding quality, and there is no possibility of bus bar and welding strip cold welding, and the overall quality of the photovoltaic module is high.

[0136] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0137] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A busbar welding system, characterized in that: include: A busbar providing module; the busbar providing module comprises a busbar, a busbar positioning device and a first transport device; The busbar positioning device comprises a first magnetic element, which is a plurality of first magnetic elements and is arranged at intervals along the length direction of the busbar, and the plurality of first magnetic elements are respectively matched with the busbar in a limiting manner; the first transport device is movable, and a second magnetic element is arranged on the first transport device, and the first magnetic element is magnetically matched with the second magnetic element, so that the first transport device operates the busbar and the busbar positioning device; the second magnetic element is an electromagnet; when the electromagnet is powered on, the electromagnet can magnetically match the first magnetic element; when the electromagnet is powered off, the electromagnet is disengaged from the first magnetic element; A battery string providing module; the battery string providing module comprises a battery string and a second transport device, a plurality of welding strips are provided at one end of the battery string, the plurality of welding strips are arranged at intervals along the extension direction of the battery string, the welding strips are suitable for welding with the bus bar, and the second transport device is used to transport the battery string; A welding module; the welding module includes a welding assembly, which can be moved to a first set position for welding the bus bar and the welding strip at the welding position, at which the bus bar and the welding strip are in contact; wherein the welding assembly includes: a substrate, an electric soldering iron head and a pressing device; the electric soldering iron head is fixed to the substrate and is used to weld the bus bar and the welding strip, and the substrate is located on the upper part of the electric soldering iron head; the pressing device is arranged on the substrate and is used to press the bus bar and the welding strip; the pressing device is movably connected to the substrate, and the pressing device is configured to stop against the bus bar when the welding assembly moves to a third set position, and when the welding assembly moves between the third set position and the first set position, the pressing device always stops against the bus bar, so that the bus bar and the welding rod will not deviate, thereby avoiding tin flow to cause cold solder joints.

2. The busbar welding system according to claim 1, characterized in that: The first magnetic element is provided with a groove, and in the length direction of the bus bar, two ends of the groove respectively penetrate the first magnetic element, and the bus bar is limitedly matched with the grooves of a plurality of the first magnetic elements.

3. The busbar welding system according to claim 2, characterized in that: The depth of the groove is greater than or equal to the thickness of the bus bar.

4. The busbar welding system according to claim 1, characterized in that: The welding module also includes: A supporting device; the supporting device comprises a supporting plate, and the supporting plate can be moved to a welding position to support the bus bar and the welding ribbon.

5. The busbar welding system according to claim 4, characterized in that: The support plate is formed with a through hole, and the through hole penetrates the support plate along the thickness direction of the support plate. Each of the first magnetic elements is respectively matched with the corresponding through hole, so that the support plate is supported on the bottom of the bus bar.

6. The busbar welding system according to claim 1, characterized in that: The welding module further comprises a collecting device, wherein the collecting device comprises: The collecting tray can be moved to a second setting position to collect the tin slag generated by the welding of the bus bar and the welding strip. In the second setting position, the collecting tray is located below the welding position.

7. The busbar welding system according to claim 1, characterized in that: The pressing device comprises: A sliding rod, wherein the sliding rod and the base plate slide and cooperate along the length direction of the sliding rod; A pressure head, which is arranged at one end of the length of the sliding rod and is suitable for abutting against the bus bar; An elastic element is sleeved outside the sliding rod and abuts between the base plate and the pressing head. The elastic element often pushes the pressing head to move in a direction away from the base plate.

8. A busbar welding method, characterized in that: The busbar welding method adopts the busbar welding system as described in any one of claims 1 to 7, comprising the following steps: (1) Pull and cut the busbar to a set length, and fit the busbar to the busbar positioning module. The second magnetic element is an electromagnet. The electromagnet is energized, and the second magnetic element and the first magnetic element are magnetically engaged so that the first transport device drives the engaged busbar and the busbar positioning device to move to the welding position. (2) The second transport device drives the battery string to move to the welding position, where each of the first magnetic elements is disposed between two adjacent welding strips; (3) The welding assembly moves to the third set position so that the pressing device stops against the bus bar, and the welding assembly continues to move to the first set position to weld the bus bar and the welding strip; After welding is completed, the welding assembly moves to between the first set position and the third set position, so that the electric soldering iron tip is separated from the bus bar, and the pressing device is still stopped against the bus bar; so that the bus bar and the welding rod will not be offset, and the tin flow is prevented from causing a cold solder joint; After a period of time, the welding assembly moves until the pressing device is separated from the bus bar; The electromagnet is then de-energized so that the electromagnet is disengaged from the first magnetic element.

9. The busbar welding method according to claim 8, characterized in that: The welding module further includes: a supporting device; the supporting device includes a supporting plate, and the supporting plate can be moved to a welding position for supporting the bus bar and the welding ribbon; in the step (1): before the bus bar, the bus bar positioning device and the battery string are moved to the welding position, the supporting plate is moved to the welding position, and then the battery string is moved onto the supporting plate; The welding method further comprises Step: After welding is completed, the support plate leaves the welding position.

10. The busbar welding method according to claim 8, characterized in that: The welding module further includes a collecting device, which includes: a collecting tray; the collecting tray can be moved to a second set position to collect tin slag generated by welding the bus bar and the welding strip, and in the second set position, the collecting tray is located below the welding position; in step (1), the collecting tray moves to the second set position; The welding method further comprises Step: After welding is completed, the collecting tray leaves the second set position.

11. A photovoltaic module, characterized in that: It comprises a battery string and a bus bar, and the battery string and the bus bar are prepared by the welding method as described in any one of claims 8-10.

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