Welding platform, stitch welding machine, welding method and program product

Abstract

The invention relates to the field of photovoltaic module manufacturing, in particular to a welding platform, a stitch welding machine, a welding method and a program product. According to the welding platform, the bracket extending in the preset direction is arranged to form the welding station, the whole to-be-welded bus bar can be placed on the bracket, then all the welding strips on one side of a battery piece can make contact with the bus bar, and the welding strips can be rapidly placed in place; the welding mechanism is adjacently arranged on the first side of the bracket and heats the surface of one side of the bus bar in a non-contact welding mode, the pressure applying mechanism moves from one side of the bracket (the position where the pressure applying mechanism does not interfere with the bus bar) to the bracket, and the pressure applying mechanism presses down to tightly press a battery piece welding strip and the bus bar in a non-contact heating area. And the welding strip is welded with the bus bar. According to the welding platform, rapid, accurate and efficient welding of the battery piece welding strip is achieved, and the production efficiency of battery pieces is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic module manufacturing, and relates to a welding platform, a stitch welding machine, a welding method and a program product. Background Art

[0002] In the manufacturing process of photovoltaic cell modules, cell ribbon welding is a core process link that determines the electrical conductivity and reliability of the module. This technology uses metal ribbons (usually tinned copper ribbons) to electrically connect the main grid lines of adjacent cells, forming a series or parallel circuit. Traditional welding processes mainly rely on infrared welding or hot air welding technology. Its principle is to heat the ribbon and cell grid lines and use the solder to melt to achieve mechanical fixation and electrical conduction. However, as the photovoltaic industry's requirements for module power density and production efficiency increase, traditional welding technology has gradually exposed efficiency bottlenecks and process defects.

[0003] Traditional welding equipment is limited by its single-point heating mode and insufficient mechanical positioning accuracy. This results in generally slow welding speeds and requires frequent downtime to adjust parameters to accommodate varying cell sizes. For example, welding a cell of a certain size requires four stages: pressurization, preheating, insulation, and cooling. Each weld takes approximately 4-6 seconds, resulting in overall low production line efficiency. Furthermore, manual intervention (such as ribbon tension calibration and post-weld quality checks) further extends production cycles.

[0004] The welding device of traditional battery cells also has the risk of thermal stress damage. The traditional welding device uses non-contact welding, and high-temperature concentrated heating can easily lead to local thermal expansion coefficient mismatch of the battery cell, causing hidden cracks or micro cracks, resulting in an increase in power attenuation rate; the traditional welding device lacks a matching structure with the battery cell welding ribbon, and there are problems of welding ribbon offset and cold solder joints. Due to insufficient alignment accuracy between the welding ribbon and the grid line (the error often exceeds ±0.2mm), welding offset or cold solder joints are prone to occur, and additional EL detection equipment is required for full inspection, which increases production costs.

[0005] Therefore, there is an urgent need for a new type of battery cell welding ribbon welding device or stack welding to achieve fast, accurate and efficient welding of battery cell welding ribbons and improve the production efficiency of battery cells. Summary of the Invention

[0006] In order to solve or at least partially solve the above technical problems, the present application provides a welding platform for welding battery cell ribbons and busbars, comprising:

[0007] A bracket extending along a preset direction and used to support the bus bar;

[0008] a welding mechanism disposed adjacent to the first side of the bracket and capable of heating the bus bar located on the second side of the bracket;

[0009] The pressing mechanism is at least partially disposed on the second side of the bracket and can be manipulated to move toward the bracket to press the battery cell welding ribbon to the heating area of the busbar.

[0010] Optionally, the welding mechanism includes:

[0011] a welding circuit, arranged along an extension direction of the bracket, for generating welding heat;

[0012] The magnetic concentrating component is arranged on one side of the welding circuit and is used to concentrate the welding heat on a partial area of the bus bar.

[0013] Optionally, the magnetic focusing component includes:

[0014] Multiple groups of magnetic blocks are arranged at intervals along the extension direction of the welding circuit, each group of magnetic blocks forms a heating sub-region located on the surface of the bus bar, and multiple heating sub-regions are arranged at intervals along the extension direction of the bus bar to correspond to each of the battery cell welding strips.

[0015] Optionally, the welding circuit includes a first circuit and a second circuit that are spaced apart;

[0016] Each group of magnetic focusing blocks includes at least a first magnetic focusing block located between the first circuit and the second circuit, a second magnetic focusing block located at the outer edge of the first circuit, and a third magnetic focusing block located at the outer edge of the second circuit.

[0017] Optionally, the bracket is provided with a guide structure corresponding to each group of the magnetic concentrating blocks;

[0018] The guiding structure is used to guide the battery cell welding ribbon close to the bus bar to the heating sub-region.

[0019] Optionally, the guide structure includes two guide side walls spaced apart along the extension direction of the bracket, and the spacing between the two guide side walls gradually increases from the bracket toward the second side of the bracket, so as to guide the battery cell welding strip to approach the heating sub-area.

[0020] Optionally, the surface of the guide structure has a first conductor capable of contacting the battery cell welding ribbon, and the surface of the bracket has a second conductor capable of contacting the bus bar;

[0021] The first conductor and the second conductor are insulated from each other and form a loop when the battery cell welding ribbon contacts the bus bar to generate a feedback signal for feedback that the battery cell welding ribbon and the bus bar are in position.

[0022] Optionally, the guide structure is slidably arranged relative to the magnetic block along the extension direction of the bracket, or the magnetic block is slidably arranged relative to the guide structure along the extension direction of the welding circuit, so that the relative position of the magnetic block and the guide structure is adjustable.

[0023] Optionally, the bracket has an air suction hole extending from the first side to the second side, and the air suction hole is located at a portion of the bracket supporting the bus bar so as to be covered by the bus bar;

[0024] A negative pressure device is provided on the first side of the bracket, and the negative pressure device is connected to the suction hole and is used to generate negative pressure to suck the bus bar tightly.

[0025] Optionally, the second side surface of the bracket has a guide groove, which extends to the edge of the bracket and is used to receive and guide the melt flowing out after the busbar is heated;

[0026] The guide groove is arranged perpendicular to the extension direction of the bracket, and a plurality of the guide grooves are arranged at intervals along the extension direction of the bracket and correspond to the area where the welding mechanism heats the bus bar.

[0027] Optionally, the welding platform further includes:

[0028] A platform body, the welding mechanism and the bracket are respectively arranged on the platform body along a straight line, the bracket at least partially covers the welding mechanism and forms a gap between the bracket and the welding mechanism;

[0029] The first moving modules are respectively arranged at both ends of the platform body and are used to drive the platform body to move.

[0030] Optionally, the bracket includes legs located on both sides of the welding mechanism, and a support plate connecting the two legs; the support plate is used to support the bus bar, and the legs are fixed to the surface of the welding platform through connecting pieces.

[0031] Optionally, the first mobile module includes:

[0032] a first frame, arranged at an angle to the extension direction of the platform body, and provided with a guide rail;

[0033] A connecting frame is provided at the end of the platform body and is slidably connected to the guide rail;

[0034] A driving mechanism is connected to the connecting frame and is used to drive the connecting frame to slide along the guide rail.

[0035] Optionally, the pressure applying mechanism includes:

[0036] A plurality of extrusion blocks are arranged at intervals along the extension direction of the bracket,

[0037] The second moving module is connected to the plurality of extrusion blocks and is used for driving the extrusion blocks to move toward the bracket.

[0038] The present application also provides a stitch welding machine, comprising a frame and:

[0039] a welding platform as described above;

[0040] a first transport mechanism, for transporting the busbar to the bracket of the welding platform;

[0041] The second transport mechanism is used to transport the battery cell close to the welding platform so that the battery cell welding ribbon contacts the bus bar.

[0042] The present application also provides a welding method, comprising:

[0043] The busbars are arranged on brackets arranged along a straight line;

[0044] Moving the battery cell welding ribbon until it contacts the busbar surface;

[0045] Extruding the battery cell welding ribbon and the bus bar;

[0046] Electromagnetic induction heating is performed on the surface of the bus bar to weld the battery cell welding strip to the bus bar.

[0047] Optionally, the step of performing electromagnetic induction heating on the busbar surface includes:

[0048] A heating area is formed on the surface of the bus bar by electromagnetic induction generated by high-frequency current;

[0049] The heating area is divided into a plurality of heating sub-areas arranged at intervals along an extending direction of the busbar.

[0050] Optionally, the step of dividing the heating area into a plurality of heating sub-areas spaced apart along the extending direction of the busbar includes:

[0051] Magnetic field collecting components are arranged at intervals along the extending direction of the bus bar on both sides of the high-frequency current, and the electromagnetic eddy current is collected on the surface of the bus bar by the magnetic field collecting components.

[0052] Optionally, before the step of performing electromagnetic induction heating on the busbar surface, the method further includes:

[0053] In response to a feedback signal generated by the two conductors on the bracket being in conduction with the bus bar through the contact of the battery cell welding ribbon, heating of the bus bar is initiated.

[0054] The present application also provides a computer program product, which is provided with a computer program, and when the computer program is executed, it can implement the steps of the method described above.

[0055] The welding platform provided by this application forms a welding station by providing a bracket extending along a preset direction. The entire busbar to be welded can be placed on the bracket, allowing the entire soldering ribbon on one side of the cell to contact the busbar, quickly placing the ribbon in place. A welding mechanism is provided adjacent to a first side of the bracket and heats the surface of one side of the busbar through non-contact welding. A pressure mechanism moves from one side of the bracket toward the bracket to press the cell solder ribbon against the heated area of the busbar, thereby welding the ribbon to the busbar. The welding platform provided by this application enables fast, precise, and efficient soldering of cell solder ribbons, effectively improving cell production efficiency.

[0056] The stitch welding machine, welding method and computer program product provided in this application also have all the advantages described above because they include the welding platform or step method described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] To more clearly illustrate the embodiments of the present application, the following briefly introduces the relevant drawings. It should be understood that the drawings described below are only used to illustrate some embodiments of the present application, and those skilled in the art can also obtain many other technical features and connection relationships not mentioned herein based on these drawings.

[0058] Figure 1 This is a schematic diagram of the structure of the welding platform for this application;

[0059] Figure 2 for Figure 1 A magnified schematic diagram of part A in FIG;

[0060] Figure 3 A schematic transverse cross-sectional view of the welding mechanism of the welding platform of this application;

[0061] Figure 4 A schematic diagram of the guide structure of the welding platform of this application;

[0062] Figure 5 for Figure 4 Schematic diagram of the cross section in the B direction;

[0063] Figure 6 This is a schematic structural diagram of the first movable module of the welding platform of this application;

[0064] Figure 7 This is a schematic diagram of the structure of the pressure mechanism of the welding platform in this application;

[0065] Figure 8 for Figure 7 A magnified schematic diagram of part C in FIG;

[0066] Figure 9 This is a flow chart of the steps of the welding method of this application.

[0067] Description of reference numerals:

[0068] 100, bracket; 110, leg; 120, support plate; 121, air intake hole; 122, guide groove; 130, connector;

[0069] 200, welding mechanism; 210, welding circuit; 211, first circuit; 212, second circuit; 220, magnetic focusing assembly; 221, first magnetic focusing block; 222, second magnetic focusing block; 223, third magnetic focusing block; 230, high-frequency power supply;

[0070] 300, pressure mechanism; 310, extrusion block; 320, second movable module; 321, second frame; 322, crossbeam; 323, first mounting frame; 324, second mounting frame; 325, mounting plate;

[0071] 400, platform body;

[0072] 500, first moving module; 510, first frame; 520, connecting frame; 530, driving mechanism;

[0073] 600, guide structure; 601, guide side wall;

[0074] 700, bus bar;

[0075] 800, welding strip;

[0076] 901, first conductor; 902, second conductor. DETAILED DESCRIPTION

[0077] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0078] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0079] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0080] The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings in the embodiments of the present application.

[0081] Example 1

[0082] like Figure 1 As shown, this embodiment provides a welding platform for automated welding of battery cell welding strips 800 and bus bars 700. The welding platform has a platform body 400, on which a bracket 100 and a welding mechanism 200 are provided. The welding of the battery cell welding strips 800 and the bus bars 700 is achieved through the mutual cooperation of the bracket 100 and the welding mechanism 200.

[0083] like Figure 1 and Figure 2 As shown, the bracket 100 is mounted on the platform body 400 and extends along a preset direction, which is the extension direction of the busbar 700. The design of the bracket 100 is to allow the busbar 700 to be directly placed on the bracket 100 to provide support for the busbar 700.

[0084] In this embodiment, the bracket 100 is mounted on the platform body 400 and forms a gap with the platform body 400. The side where the gap is located is positioned as the first side of the bracket 100, that is, the lower side after the bracket 100 is fixed and installed. The side of the bracket 100 away from the platform body 400 is positioned as the second side of the bracket 100, that is, the upper side after the bracket 100 is fixed and installed. The bus bar 700 is placed on the second side surface of the bracket 100.

[0085] See Figure 2 The welding mechanism 200 of this embodiment is disposed adjacent to the first side of the bracket 100 and is capable of heating the bus bar 700 located on the second side of the bracket 100 .

[0086] It should be noted that the welding mechanism 200 of this embodiment is a high-frequency welding device, a process that uses the resistive heat generated by high-frequency current (typically at a frequency of 100 to 500 kHz) to connect metal materials. Its core advantages are fast heating speed, high efficiency, and the ability to achieve localized precise heating, making it particularly suitable for welding thin-walled materials. The welding mechanism 200 of this embodiment utilizes the proximity effect in high-frequency welding to achieve contactless welding from one side of the bracket 100 to the other, overcoming the layout obstacles of the equipment structure and directly heating the surface of the busbar 700. The specific explanation of the proximity effect is common knowledge in the field and will not be repeated in this embodiment.

[0087] This embodiment also includes a pressure mechanism 300, which is at least partially disposed on the second side of the bracket 100. The pressure mechanism 300 is connected to the control mechanism and moves toward the bracket 100 in response to the control mechanism to press the cell welding ribbon 800 against the heated area of the busbar 700. As the welding mechanism 200 heats the surface of the busbar 700, the cell welding ribbon 800 always maintains contact with the busbar 700, thereby achieving welding of the cell welding ribbon 800 to the busbar 700.

[0088] The welding platform of this embodiment forms a welding station by providing a bracket 100 extending along a preset direction. The entire busbar 700 to be welded can be placed on the bracket 100, and the welding ribbon 800 on one side of the cell can then be completely brought into contact with the busbar 700, quickly placing the welding ribbon 800 in place. The welding mechanism 200 is positioned adjacent to a first side of the bracket 100 and heats one side of the busbar 700 using high-frequency non-contact welding. The pressure mechanism 300 moves from one side of the bracket 100 toward the bracket 100 to press the cell welding ribbon 800 against the heated area of the busbar 700, thereby welding the welding ribbon 800 to the busbar 700. The welding platform of this embodiment achieves rapid, precise, and efficient welding of the cell welding ribbon 800, effectively improving the production efficiency of the cell.

[0089] like Figure 2 As shown, in this embodiment, the welding mechanism 200 includes a welding circuit 210 and a magnetic focusing component 220 .

[0090] The welding circuit 210 is arranged along the extension direction of the bracket 100 so that the welding circuit 210 corresponds to the placed bus bar 700. The welding circuit 210 is connected to the high-frequency power supply 230, and generates a magnetic field through high-frequency current, thereby generating welding heat to heat the bus bar 700.

[0091] In this embodiment, the magnetic concentrator assembly 220 is primarily composed of a material with high magnetic permeability that can effectively guide and concentrate magnetic fields, such as ferrite, silicon steel, amorphous alloy, neodymium iron boron, aluminum nickel cobalt, etc. The magnetic concentrator assembly 220 is disposed on one side of the welding circuit 210. Using its magnetic permeability, the magnetic concentrator assembly 220 can guide the eddy currents in the magnetic field generated by the welding circuit 210, thereby concentrating the magnetic field generated by the welding circuit 210 and focusing the welding heat on a portion of the busbar 700. This achieves directional welding heat conduction, which is beneficial for improving welding efficiency and reducing energy consumption. This can appropriately reduce the high-frequency current demand of the welding circuit 210. Alternatively, the same high-frequency current can be used to weld more welding ribbons 800, increasing the length of the battery cell welds and improving welding efficiency.

[0092] like Figure 2 As shown, in this embodiment, the magnetic concentrator assembly 220 includes multiple groups of magnetic concentrators. Each group of magnetic concentrators can be made of a magnetically conductive material such as ferrite, silicon steel, amorphous alloy, neodymium iron boron, or aluminum nickel cobalt. The magnetic concentrators are spaced apart along the extension direction of the welding circuit 210. Each group of magnetic concentrators forms a heating sub-region located on the surface of the busbar 700. The multiple heating sub-regions are spaced apart along the extension direction of the busbar 700 to correspond to each cell welding ribbon 800.

[0093] In this embodiment, the magnetic focusing assembly 220 is divided into multiple groups of magnetic blocks along the extension direction of the welding circuit 210. Each group of magnetic blocks independently forms a heating sub-area on the surface of the bus bar 700. In this way, the heating area on the surface of the bus bar 700 is also segmented, so that only the surface of the bus bar 700 in the contact area with the welding strip 800 can be heated, avoiding heating of the entire surface of the bus bar 700, effectively reducing energy consumption, and the saved energy can be used to weld more welding strips 800, thereby improving welding efficiency; and the heating temperature is reduced to a certain extent to prevent excessive temperature from affecting the battery cells.

[0094] See Figure 3In one embodiment, the welding circuit 210 includes a first circuit 211 and a second circuit 212 spaced apart from each other. Each set of magnetic focusing blocks includes at least a first magnetic focusing block 221 located between the first circuit 211 and the second circuit 212, a second magnetic focusing block 222 located at the outer edge of the first circuit 211, and a third magnetic focusing block 223 located at the outer edge of the second circuit 212. The three magnetic focusing blocks are located in the middle and on both sides of the first circuit 211 and the second circuit 212, respectively, thereby effectively guiding the magnetic field lines generated by the first circuit 211 and the second circuit 212, concentrating the magnetic field eddy currents on the surface of the busbar 700 to form a heating sub-region.

[0095] The arrangement of the magnetic blocks in this embodiment is not limited thereto. In some embodiments, the magnetic blocks may be arranged in other different ways as long as the welding heat can be concentrated on the surface of the busbar 700 .

[0096] like Figure 4 As shown, in one embodiment, a guide structure 600 is provided on the bracket 100, each guide structure 600 corresponds to each group of magnetic blocks, and the guide structure 600 is provided on one side of the bracket 100. The guide structure 600 is used to guide the battery cell welding ribbon 800 close to the bus bar 700 to the heating sub-area. In this way, when the battery cell welding ribbon 800 approaches the bus bar 700, it will first contact the guide structure 600, and enter the heating sub-area and contact the bus bar 700 under the guidance of the guide structure 600. This ensures that the battery cell welding ribbon 800 is in the welding station when it moves to contact the bus bar 700, avoiding the phenomenon of missing welding or cold welding caused by the deviation of the battery cell welding ribbon 800.

[0097] Furthermore, if Figure 4 As shown, the guide structure 600 in this embodiment includes a plurality of guide blocks spaced apart along the extension direction of the bracket 100, and two surfaces opposite to each other between adjacent guide blocks form two guide side walls 601 spaced apart along the extension direction of the bracket 100, that is, inner walls of grooves are formed between adjacent guide blocks, and the middle or bottom of each guide block groove corresponds to each heating sub-area.

[0098] Furthermore, the spacing between the two guide sidewalls 601 gradually increases from the bracket 100 toward the second side of the bracket 100. As a result, when the solder ribbon 800 moves from the second side of the bracket 100 into the groove of the guide block and contacts the guide sidewall 601, the guide sidewall 601 guides the cell solder ribbon 800 toward the heating sub-region and ultimately contacts the busbar 700 within the heating sub-region. The guide sidewall 601 effectively guides the solder ribbon 800 into position, improving the alignment efficiency between the solder ribbon 800 and the busbar 700, preventing the solder ribbon 800 from shifting, and ensuring subsequent welding quality.

[0099] Preferably, in one embodiment, Figure 4As shown, the guide structures 600 are arranged in pairs on both sides of the bracket 100, so that the bracket 100 can perform welding operations on the battery cells on both sides at the same time.

[0100] As a further improvement, in one embodiment, Figure 5 As shown, the surface of the guide structure 600 has a first conductor 901 that can contact the battery cell welding ribbon 800 , and the surface of the bracket 100 has a second conductor 902 that can contact the bus bar 700 .

[0101] See Figure 5 The first conductor 901 is embedded in the guide sidewall 601 of the guide structure 600, or is disposed at the bottom of a groove in the guide structure 600, ensuring that the welding ribbon 800 contacts the first conductor 901 when it contacts the busbar 700. The second conductor 902 is embedded in the upper surface of the bracket 100. When the busbar 700 is placed on the upper surface of the bracket 100, the busbar 700 contacts the second conductor 902.

[0102] In this embodiment, the first conductor 901 and the second conductor 902 are insulated from each other, that is, when the welding ribbon 800 does not contact the bus bar 700, the first conductor 901 and the second conductor 902 are insulated from each other. The first conductor 901 and the second conductor 902 are respectively connected to corresponding detection circuits. When the welding ribbon 800 moves to contact the bus bar 700, the first conductor 901 and the second conductor 902 contact the bus bar 700 through the welding ribbon 800, so that the detection circuit forms a loop, and the detection circuit generates a feedback signal for feedback that the battery cell welding ribbon 800 and the bus bar 700 are in contact.

[0103] The feedback signal is sent to the processor of the welding platform. When the processor receives the feedback signal, it indicates that the welding ribbon 800 is at the welding position. At this time, the processor can control the welding mechanism 200 to start and realize welding heating of the welding ribbon 800 and the bus bar 700.

[0104] This embodiment realizes rapid feedback of the movement of the welding ribbon 800 into position by providing the first conductor 901 and the second conductor 902. It can not only determine or verify the placement of the welding ribbon 800, but also automatically start the welding process, saving manpower detection and time costs, realizing the automation of welding, and further improving the welding efficiency of the battery cell.

[0105] In one embodiment, the guide structure 600 is slidably arranged relative to the magnetic block along the extension direction of the bracket 100, or the magnetic block has a slot, and the magnetic block can be slidably arranged relative to the guide structure 600 along the extension direction of the welding circuit 210 in the slot, so that the relative position of the magnetic block and the guide structure 600 can be adjusted, thereby controlling the position of the heating sub-area so as to adjust it according to the position of the bus bar 700 or the welding strip 800 to determine the optimal welding point.

[0106] In one embodiment, Figure 3 As shown, the bracket 100 includes legs 110 located on either side of the welding mechanism 200 and a support plate 120 connecting the two legs 110. The support plate 120 is used to support the busbar 700. The legs 110 are supported on the surface of the platform body 400, creating a gap between the support plate 120 and the surface of the platform body 400. The legs 110 are fixed to the surface of the platform body 400 by connectors 130. By adjusting the connectors 130, the legs 110 can slide on the surface of the platform body 400 to adjust the position of the bracket 100.

[0107] like Figure 2 As shown, in one embodiment, the surface of the bracket 100 has an air intake hole 121 extending from the first side to the second side. The air intake hole 121 is located at the portion where the bracket 100 supports the bus bar 700, and is specifically arranged on the support plate 120. When the bus bar 700 is placed on the bracket 100, the air intake hole 121 can be covered.

[0108] A certain gap is left between the first side of the bracket 100 and the welding mechanism 200. A negative pressure device is provided in the gap. The negative pressure device is connected to the suction hole 121 and is used to generate negative pressure to suck the busbar 700 tightly, so that the busbar 700 is fixed on the bracket 100 to prevent the busbar 700 from shifting.

[0109] Specifically, the negative pressure device can be an air pipe, one end of which is connected to the suction hole 121, and the other end extends out of the welding platform to connect to the corresponding air pressure source. The air pressure source generates negative pressure in response to the control of an external controller to tighten the bus bar 700.

[0110] Furthermore, the air pressure source can be connected to the second conductor 902 mentioned above. When the busbar 700 is placed on the bracket 100, the air pressure source forms a loop with the busbar 700 and the second conductor 902, and the air pressure source automatically generates negative pressure to suck the busbar 700 tightly.

[0111] like Figure 2As shown, in one embodiment, the second side surface of the bracket 100 has a guide groove 122, that is, the surface of the support plate 120 is provided with a guide groove 122, and the guide groove 122 extends to the edge of the support plate 120 of the bracket 100, and is used to receive and guide the melt flowing out after the bus bar 700 is heated, to prevent the melt from accumulating on the surface of the bracket 100 and affecting the flatness of the bus bar 700.

[0112] The guide groove 122 is arranged perpendicular to the extension direction of the bracket 100. Multiple guide grooves 122 are arranged at intervals along the extension direction of the bracket 100 and correspond to the area where the welding mechanism 200 heats the bus bar 700, ensuring that the molten material after welding in each heating sub-area can be smoothly discharged.

[0113] like Figure 1 As shown, in this embodiment, the welding mechanism 200 and the bracket 100 are respectively arranged in a straight line on the platform body 400. The bracket 100 at least partially covers the welding mechanism 200 and forms a gap between the welding mechanism 200. The first movable module 500 is respectively provided at both ends of the platform body 400. The first movable module 500 is used to drive the platform body 400 to move, thereby adjusting the position of the welding platform within the entire stitch welding machine.

[0114] like Figure 6 As shown, in one embodiment, the first movable module 500 includes a first frame 510, a connecting frame 520, and a driving mechanism 530. The first frame 510 is arranged at an angle to the extension direction of the platform body 400, which is a right angle in the figure. The first frame 510 is provided with a guide rail; the connecting frame 520 is provided at the end of the platform body 400 and is slidably connected to the guide rail; the driving mechanism 530 is connected to the connecting frame 520 and is used to drive the connecting frame 520 to slide along the guide rail to adjust the position of the welding platform.

[0115] like Figure 7 As shown, the pressure mechanism 300 of this embodiment includes a plurality of extrusion blocks 310 and a second movable module 320. The plurality of extrusion blocks 310 are arranged at intervals along the extension direction of the bracket 100 so as to correspond to the busbar 700. The second movable module 320 is connected to the plurality of extrusion blocks 310 and is used to drive the extrusion blocks 310 to move toward the bracket 100 so that each extrusion block 310 corresponds to the welding ribbon 800 of each heating sub-region, thereby squeezing the welding ribbon 800 and the busbar 700 to ensure that the welding ribbon 800 and the busbar 700 are fully welded.

[0116] Specifically, the second movable module 320 includes two parallel second frames 321, with a crossbeam 322 positioned between the two second frames 321. The crossbeam 322 is suspended from the second frames 321 via a sling. The second frames 321 are provided with guide rails, along which the crossbeam 322 slides via the sling. A drive motor is provided at one end of the second frames 321 to drive the crossbeam 322 along the guide rails.

[0117] A first mounting bracket 323 is provided on the crossbeam 322 , and a guide rail is also provided on the crossbeam 322 along its extension direction. The first mounting bracket 323 is slidably provided along the guide rail of the crossbeam 322 through another driving mechanism.

[0118] The second mounting frame 324 is provided on the first mounting frame 323 . The first mounting frame 323 is also provided with a corresponding guide rail. The second mounting frame 324 is slidably provided along the guide rail via another driving mechanism.

[0119] like Figure 8 As shown, a mounting plate 325 is mounted on the second mounting frame 324 , and the mounting plate 325 is aligned with the extension direction of the bracket 100 . A plurality of extrusion blocks 310 are sequentially arranged and spaced apart on the mounting plate 325 for extruding the welding ribbon 800 .

[0120] In this embodiment, the guide rails on the second frame 321, the crossbeam 322, and the first mounting frame 323 are perpendicular to each other to enable adjustment of the extrusion block 310 in multiple degrees of freedom. The guide rails on the first mounting frame 323 are preferably arranged vertically to facilitate the downward movement of the extrusion block 310 to extrude the welding ribbon 800. Of course, in one embodiment, the first mounting frame 323 or the second mounting frame 324 may be a telescopic mechanism to achieve the downward movement of the extrusion block 310.

[0121] Example 2

[0122] This embodiment provides a stitch welding machine, comprising a frame on which the welding platform described in the above embodiment is mounted. The frame is also provided with a first transport mechanism for transporting a busbar 700 to a bracket 100 on the welding platform; and a second transport mechanism for transporting a cell close to the welding platform so that the cell welding ribbon 800 contacts the busbar 700.

[0123] The stitch welding machine of this embodiment realizes automatic conveying of the battery cell welding strips 800 and the bus bar 700 and realizes automatic welding through the cooperation of the first conveying mechanism, the second conveying mechanism and the welding platform. While having the welding advantages mentioned in the above embodiments, it further improves the battery cell processing efficiency.

[0124] Regarding the specific structures of the first transport mechanism and the second transport mechanism of this embodiment, they can be a multi-axis mobile platform or a robot arm, which will not be described in detail in this embodiment.

[0125] Example 3

[0126] This embodiment provides a welding method, such as Figure 9 As shown, the method includes the following steps:

[0127] Step 1: Place the busbar 700 on the brackets 100 arranged along a straight line;

[0128] In this step, by setting up a welding platform as mentioned in the above embodiment 1 or 2, the busbar 700 is placed as a whole on the bracket 100 of the welding platform by a moving mechanism or a manipulator. At this time, the busbar 700 is in place.

[0129] Step 2: Move the cell welding ribbon 800 until it contacts the surface of the bus bar 700;

[0130] In this step, the battery cell is transported by a moving mechanism or a manipulator, and the welding ribbon 800 to be welded on one side of the battery cell is facing the welding platform. The moving mechanism or the manipulator brings the battery cell welding ribbon 800 close to the welding platform. Specifically, the battery cell welding ribbon 800 is brought close to the guide structure 600 next to the bracket 100. Through the guidance of the guide structure 600, each battery cell welding ribbon 800 enters each heating area accordingly and contacts the surface of the bus bar 700.

[0131] Step 3: Extruding the cell ribbon 800 and the bus bar 700;

[0132] In this step, the pressing mechanism 300 mentioned in the above embodiment is lowered, so that the pressing block 310 is lowered to press the solder ribbon 800, pressing the solder ribbon 800 against the surface of the bus bar 700. While pressing, step 4 is started.

[0133] Step 4: Electromagnetic induction heating is performed on the surface of the bus bar 700 to weld the battery cell welding ribbon 800 to the bus bar 700 .

[0134] In this step, a heating area is formed on the surface of the bus bar 700 by electromagnetic induction generated by high-frequency current, and the welding ribbon 800 and the bus bar 700 are simultaneously in the heating area and are heated and welded.

[0135] In this step, the heating area may be divided into a plurality of heating sub-areas spaced apart along the extending direction of the busbar 700 , and each heating sub-area heats one welding ribbon 800 .

[0136] Specifically, the step of dividing the heating area into a plurality of heating sub-areas spaced apart along the extension direction of the busbar 700 includes: providing magnetic concentrators 220 spaced apart along the extension direction of the busbar 700 on both sides of the high-frequency current, and concentrating the electromagnetic eddy currents on the surface of the busbar 700 through the magnetic concentrators 220. In this way, the heating area on the surface of the busbar 700 is also segmented, so that only the surface of the busbar 700 in contact with the welding ribbon 800 is heated, avoiding heating the entire surface of the busbar 700, effectively reducing energy consumption. The saved energy can be used to weld more welding ribbons 800, thereby improving welding efficiency. The heating temperature is also reduced to a certain extent, preventing excessive temperature from affecting the battery cells.

[0137] Furthermore, before step 4, the controller may start heating the bus bar 700 in response to a feedback signal generated by the two conductors on the bracket 100 being in contact with the bus bar 700 through the cell ribbons 800 to form conduction.

[0138] In this step, the first conductor 901 and the second conductor 902 described above are provided. When the cell ribbon 800 contacts the busbar 700, the first conductor 901 and the second conductor 902 form a loop, thereby generating a feedback signal. Upon receiving the signal, the controller initiates heating of the busbar 700. For details regarding this portion, please refer to the description of Example 1 above and will not be repeated here.

[0139] This embodiment realizes rapid feedback of the movement of the welding ribbon 800 into position by providing the first conductor 901 and the second conductor 902. It can not only determine or verify the placement of the welding ribbon 800, but also automatically start the welding process, saving manpower detection and time costs, realizing the automation of welding, and further improving the welding efficiency of the battery cell.

[0140] Example 4

[0141] This embodiment provides a computer program product, which includes a computer program that, when executed, can implement the steps of the method described in the above embodiment. Therefore, this embodiment also has all the advantages described above, which will not be repeated here.

[0142] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0143] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 embodiment 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A welding platform for welding a battery cell welding ribbon (800) and a bus bar (700), characterized in that: include: a bracket (100) extending along a preset direction and used to support the busbar (700); a welding mechanism (200) disposed adjacent to a first side of the bracket (100) and capable of heating the bus bar (700) located on a second side of the bracket (100); A pressure mechanism (300) is at least partially disposed on the second side of the bracket (100) and can be manipulated to move toward the bracket (100) to press the battery cell welding strip (800) to the heating area of the busbar (700).

2. The welding platform according to claim 1, characterized in that: The welding mechanism (200) comprises: a welding circuit (210), arranged along the extension direction of the bracket (100), for generating welding heat; A magnetic concentrating component (220) is provided on one side of the welding circuit (210) and is used to concentrate the welding heat on a partial area of the busbar (700).

3. The welding platform according to claim 2, characterized in that: The magnetic focusing component (220) includes: A plurality of groups of magnetic blocks are arranged at intervals along the extension direction of the welding circuit (210), and each group of magnetic blocks forms a heating sub-region located on the surface of the bus bar (700). The plurality of heating sub-regions are arranged at intervals along the extension direction of the bus bar (700) to correspond to each of the battery cell welding strips (800).

4. The welding platform according to claim 3, characterized in that: The welding circuit (210) includes a first circuit (211) and a second circuit (212) that are spaced apart. Each group of magnetic focusing blocks at least includes a first magnetic focusing block (221) located between the first circuit (211) and the second circuit (212), a second magnetic focusing block (222) located at the outer edge of the first circuit (211), and a third magnetic focusing block (223) located at the outer edge of the second circuit (212).

5. The welding platform according to claim 3, characterized in that: The bracket (100) is provided with a guide structure (600) corresponding to each group of the magnetic concentrating blocks; The guiding structure (600) is used to guide the battery cell welding ribbon (800) close to the bus bar (700) to the heating sub-region.

6. The welding platform according to claim 5, characterized in that: The guide structure (600) comprises two guide side walls (601) spaced apart along an extension direction of the bracket (100), wherein the spacing between the two guide side walls (601) gradually increases from the bracket (100) toward a second side of the bracket (100), so as to guide the battery cell welding strip (800) to approach the heating sub-region.

7. The welding platform according to claim 6, characterized in that: The surface of the guide structure (600) has a first conductor (901) capable of contacting the battery cell welding ribbon (800), and the surface of the bracket (100) has a second conductor (902) capable of contacting the bus bar (700); The first conductor (901) and the second conductor (902) are insulated and form a loop when the cell welding ribbon (800) contacts the bus bar (700) to generate a feedback signal for feedback that the cell welding ribbon (800) and the bus bar (700) are in position.

8. The welding platform according to claim 5, characterized in that: The guide structure (600) is slidably arranged relative to the magnetic block along the extension direction of the bracket (100), or the magnetic block is slidably arranged relative to the guide structure (600) along the extension direction of the welding circuit (210), so that the relative position of the magnetic block and the guide structure (600) is adjustable.

9. The welding platform according to any one of claims 1 to 8, characterized in that: The bracket (100) has an air intake hole (121) extending from the first side to the second side, and the air intake hole (121) is located at a portion of the bracket (100) supporting the bus bar (700) so as to be covered by the bus bar (700); A negative pressure device is provided on the first side of the bracket (100), and the negative pressure device is connected to the suction hole (121) and is used to generate negative pressure to suck the busbar (700) tightly.

10. The welding platform according to any one of claims 1 to 8, characterized in that: The second side surface of the bracket (100) has a guide groove (122), and the guide groove (122) extends to the edge of the bracket (100) and is used to receive and guide the melt flowing out of the bus bar (700) after heating; The guide groove (122) is arranged perpendicular to the extension direction of the bracket (100), and a plurality of the guide grooves (122) are arranged at intervals along the extension direction of the bracket (100) and correspond to the area where the welding mechanism (200) heats the bus bar (700).

11. The welding platform according to any one of claims 1 to 8, characterized in that: The welding platform also includes: A platform body (400), the welding mechanism (200) and the bracket (100) are respectively arranged on the platform body (400) along a straight line, the bracket (100) at least partially covers the welding mechanism (200) and forms a gap between the bracket (100) and the welding mechanism (200); The first moving modules (500) are respectively arranged at both ends of the platform body (400) and are used to drive the platform body (400) to move.

12. The welding platform according to claim 11, characterized in that: The bracket (100) comprises legs (110) located on both sides of the welding mechanism (200), and a support plate (120) connecting the two legs (110); the support plate (120) is used to support the busbar (700), and the legs (110) are fixed to the surface of the welding platform (400) through a connector (130).

13. The welding platform according to claim 11, characterized in that The first mobile module (500) comprises: A first frame (510) is arranged at an angle with respect to the extension direction of the platform body (400), and a guide rail is provided on the first frame (510); A connecting frame (520) is provided at the end of the platform body (400) and is slidably connected to the guide rail; A driving mechanism (530) is connected to the connecting frame (520) and is used to drive the connecting frame (520) to slide along the guide rail.

14. The welding platform according to any one of claims 1 to 8, characterized in that The pressure applying mechanism (300) comprises: A plurality of extrusion blocks (310) are arranged at intervals along the extension direction of the bracket (100), The second moving module (320) is connected to the plurality of extrusion blocks (310) and is used to drive the extrusion blocks (310) to move toward the bracket (100).

15. A stitch welding machine, characterized in that: The invention comprises a rack and the following components respectively installed on the rack: A welding platform as claimed in any one of claims 1 to 14; a first transport mechanism, used for transporting the busbar (700) to the bracket (100) of the welding platform; The second transport mechanism is used to transport the battery cell close to the welding platform so that the battery cell welding strip (800) contacts the bus bar (700).

16. A welding method, characterized in that: include: The busbars (700) are arranged on brackets (100) arranged along a straight line; Moving the battery cell welding ribbon (800) until it contacts the surface of the bus bar (700); Extruding the battery cell welding ribbon (800) and the bus bar (700); Electromagnetic induction heating is performed on the surface of the busbar (700) to weld the battery cell welding strip (800) to the busbar (700).

17. The welding method according to claim 16, characterized in that: The step of performing electromagnetic induction heating on the surface of the busbar (700) comprises: A heating area is formed on the surface of the bus bar (700) through electromagnetic induction generated by high-frequency current; The heating area is divided into a plurality of heating sub-areas arranged at intervals along the extending direction of the busbar (700).

18. The welding method according to claim 17, characterized in that: The step of dividing the heating area into a plurality of heating sub-areas spaced apart along the extending direction of the busbar (700) comprises: Magnetic field collecting components (220) are arranged at intervals along the extension direction of the bus bar (700) on both sides of the high-frequency current, and the electromagnetic eddy current is collected on the surface of the bus bar (700) by the magnetic field collecting components (220).

19. The welding method according to claim 16, wherein: Before the step of performing electromagnetic induction heating on the surface of the busbar (700), the method further comprises: In response to a feedback signal generated by the two conductors on the bracket (100) being in contact with the bus bar (700) through the battery cell welding ribbon (800) to form conduction, heating of the bus bar (700) is started.

20. A computer program product, provided with a computer program, characterized in that When the computer program is executed, the computer program can implement the steps of the method according to any one of claims 16 to 19.

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