Welding method and welding device

Abstract

The invention discloses a welding method and a welding device. The welding method comprises the steps that a conductive back plate is placed on a welding table, and a bus bar is placed on the conductive back plate; pressing the end part of the bus bar on the conductive back plate by using a welding pinch roller mechanism in a movable welding assembly, and enabling the welding assembly to move along the welding advancing direction; in the moving process of the welding assembly, a welding pressing wheel in the welding pressing wheel mechanism and an auxiliary pressing wheel mechanism in the welding assembly are used for pressing the bus bar on the conductive back plate, and at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism is used for flattening the welded section of the bus bar. In the embodiment of the invention, through the cooperation of the auxiliary pressing wheel and the welding pressing wheel, the pressing effect of the bus bar can be improved, and the auxiliary pressing wheel can flatten the unsolidified tin material or tin slag on the welded section so as to ensure the flatness of the surface of the welded bus bar.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a welding method and a welding device. Background Art

[0002] A back-contact cell is a cell with electrodes on the back of the cell. In one interconnection method, multiple back-contact cells are interconnected via a conductive backplane.

[0003] When multiple back-contact cells are interconnected through a conductive back plate, a bus bar needs to be welded to the conductive back plate using a welding device.

[0004] However, existing welding devices have poor pressing effects on busbars during welding, and uneven tin slag will remain on the busbars after welding, posing a risk of puncturing the packaging film and battery cells. Summary of the Invention

[0005] The present invention provides a welding method and a welding device, which aim to at least solve the technical problems in the prior art of poor pressing effect on busbars during welding and uneven tin slag remaining on the busbars after welding.

[0006] In a first aspect, an embodiment of the present invention provides a welding method, comprising:

[0007] Placing a conductive back plate on a welding table, and placing a bus bar on the conductive back plate;

[0008] Using a welding pressing wheel mechanism in a movable welding assembly to press the end of the busbar onto the conductive back plate, and moving the welding assembly along a welding direction;

[0009] During the movement of the welding assembly, the busbar is pressed onto the conductive backplate using the welding pressing wheel in the welding pressing wheel mechanism and the auxiliary pressing wheel mechanism in the welding assembly, and the welded section of the busbar is flattened using at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism;

[0010] Wherein, the auxiliary pressing wheel mechanism is located on one side of the welding pressing wheel mechanism along a direction opposite to the welding direction of the welding assembly; the auxiliary pressing wheel has a pressing surface without a groove.

[0011] Optionally, the step of pressing the busbar onto the conductive backplane using the welding pressing wheel in the welding pressing wheel mechanism and the auxiliary pressing wheel mechanism in the welding assembly, and flattening a welded section of the busbar using at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism, comprises:

[0012] First, a welding pressing wheel mechanism providing a first downward force is used to press at least one side of a first section being welded in the busbar, and an auxiliary pressing wheel mechanism providing a second downward force is used to press a side of the first section in a direction opposite to the welding direction of the welding assembly, and then the auxiliary pressing wheel mechanism providing the second downward force is used to flatten the welded first section;

[0013] The first downward force is smaller than the second downward force, the first downward force is provided by a first elastic member connected to the welding pressure wheel mechanism, and the second downward force is provided by a second elastic member connected to the auxiliary pressure wheel mechanism.

[0014] Optionally, the step of first pressing at least one side of the first section being welded in the busbar by using a welding pressing wheel mechanism that provides a first downward force comprises:

[0015] First, the front welding pressure wheel in the welding pressure wheel mechanism providing a first downward force is used to press the first section of the busbar being welded on one side along the welding travel direction, and the rear welding pressure wheel in the welding pressure wheel mechanism providing a first downward force is used to press the first section on one side along the direction opposite to the welding travel direction of the welding assembly.

[0016] Optionally, before placing the conductive back plate on the welding table and placing the busbar on the conductive back plate, the process further includes:

[0017] Cutting the long busbar to obtain a busbar group, wherein the busbar group includes a plurality of busbars arranged at intervals;

[0018] Placing the conductive back plate on the welding table and placing the busbar on the conductive back plate includes:

[0019] Placing at least one conductive back plate on a welding table, and placing at least one bus bar group on at least one of the conductive back plates;

[0020] The method of using a welding pressing wheel mechanism in a movable welding assembly to press the end of the busbar onto the conductive back plate and moving the welding assembly along a welding direction includes:

[0021] Using a welding pressing wheel mechanism in a movable welding assembly to press the first end of the first busbar onto the conductive backplate, and moving the welding assembly along the welding direction;

[0022] During the movement of the welding assembly, at least one rotatable welding pressing wheel in the welding pressing wheel mechanism and at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism are used to press the busbar onto the conductive backplate, and after the welded busbar is flattened by the auxiliary pressing wheel, the method further includes:

[0023] When the welding of the last bus bar is completed, the welding assembly stops moving along the welding travel direction.

[0024] Optionally, the welding assembly further comprises a welding source mechanism;

[0025] The moving of the welding assembly along the welding direction comprises:

[0026] Starting the welding source mechanism and moving the welding assembly along the welding travel direction;

[0027] After moving the welding assembly along the welding direction, the method further comprises:

[0028] During the movement of the welding assembly, when the welding assembly moves to the gap between two adjacent bus bars, the welding source mechanism is closed.

[0029] Optionally, the step of pressing the first end of the first busbar onto the conductive backplane using a welding pressing wheel mechanism in a movable welding assembly includes:

[0030] The end of the first busbar is pressed onto the conductive backplate using a movable pressing belt assembly, and the head end of the first busbar is pressed onto the conductive backplate using a welding pressing wheel mechanism in a movable welding assembly, wherein the pressing belt assembly is located on one side of the welding assembly along the welding direction of the welding assembly; the pressing belt assembly includes a pressing block, a mounting block, and a third elastic member, and the pressing block is connected to the mounting block via the third elastic member;

[0031] After moving the welding assembly along the welding direction and before stopping the welding assembly from moving along the welding direction when the welding of the last bus bar is completed, the method further includes:

[0032] During the movement of the welding assembly, when the distance between the welding assembly and the pressing belt assembly is less than a preset distance, the pressing belt assembly is moved to the next bus bar at a preset speed and the end of the next bus bar is pressed onto the conductive backplane, wherein the preset speed is greater than the movement speed of the welding assembly.

[0033] In a second aspect, an embodiment of the present invention provides a welding device, comprising a movable welding assembly, wherein the welding assembly comprises a welding pressure wheel mechanism and an auxiliary pressure wheel mechanism, wherein the welding pressure wheel mechanism comprises a rotatable welding pressure wheel, and the auxiliary pressure wheel mechanism comprises at least one rotatable auxiliary pressure wheel;

[0034] The auxiliary pressing wheel has a pressing surface without a groove, and the auxiliary pressing wheel mechanism is located on a side of the welding pressing wheel mechanism in a direction opposite to the welding direction of the welding assembly;

[0035] The welding pressing wheel and the auxiliary pressing wheel are both used to press the busbar onto the conductive back plate, and the auxiliary pressing wheel is also used to flatten a section of the busbar after welding.

[0036] Optionally, the welding assembly further comprises a main mounting member, and the welding pressure wheel mechanism and the auxiliary pressure wheel mechanism are connected to the main mounting member via a first elastic member and a second elastic member respectively;

[0037] When the welding pressing wheel and the auxiliary pressing wheel press the busbar onto the conductive back plate, the downward elastic force provided by the first elastic member is smaller than the downward elastic force provided by the second elastic member.

[0038] Optionally, the welding assembly further comprises a welding source mechanism, wherein one end of the welding source mechanism close to the welding pressure wheel mechanism has a welding head;

[0039] The number of the welding pressure wheels is at least two, and the at least two welding pressure wheels include a rear welding pressure wheel, which is located on the side of the welding head in the opposite direction to the welding direction of the welding assembly, and the surface of the rear welding pressure wheel is provided with an anti-stick coating.

[0040] Optionally, the welding pressure wheel mechanism also includes a first mounting seat, and the welding rear pressure wheel is rotatably connected to the first mounting seat. The welding assembly also includes a light shielding plate, which is connected to the first mounting seat, and the light shielding plate is located on the side of the welding rear pressure wheel close to the welding head.

[0041] Optionally, at least two of the welding pressure wheels further include a front welding pressure wheel, and the front welding pressure wheel is located on one side of the welding head along the welding direction of the welding assembly;

[0042] Along the welding direction of the welding assembly, the distance between the welding front pressure wheel and the welding rear pressure wheel is greater than or equal to 5 cm and less than or equal to 13 cm.

[0043] Optionally, the welding pressure wheel mechanism also includes a first adjustment mechanism and a first connecting seat, the first mounting seat is connected to the first adjustment mechanism, the first adjustment mechanism is connected to the first connecting seat, and the first adjustment mechanism is used to adjust the position of the first mounting seat along the spacing direction of the front welding pressure wheel and the rear welding pressure wheel.

[0044] Optionally, the welding device further comprises a movable pressing belt assembly, wherein the pressing belt assembly is located on one side of the welding assembly along the welding travel direction of the welding assembly;

[0045] The pressing belt assembly includes a pressing block, a mounting block and a third elastic member. The pressing block is connected to the mounting block via the third elastic member. The pressing block is used to press the busbar onto the conductive backplane.

[0046] Optionally, the welding assembly further includes a smoke exhaust structure, which is located above the welding pressure wheel and the auxiliary pressure wheel. The smoke exhaust structure has a smoke exhaust port, and the smoke exhaust port is connected to a smoke exhaust machine.

[0047] In an embodiment of the present invention, when welding a section of a busbar, the welding pressure wheel and the auxiliary pressure wheel provide downward pressure to press the busbar against the conductive backsheet. After the section is welded, the auxiliary pressure wheel provides downward pressure to press the welded section against the conductive backsheet. The cooperation between the auxiliary pressure wheel and the welding pressure wheel can improve the pressing effect of the busbar, avoiding the impact of poor solder joints on the yield of the photovoltaic module including the busbar and the conductive backsheet. In addition, the auxiliary pressure wheel also smoothes out unsolidified tin or tin slag on the welded section to ensure the flatness of the busbar surface after welding, reduce the uneven tin slag remaining after welding, and thus avoid the risk of tin slag piercing the encapsulation film or solar cells.

[0048] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A flowchart of a welding method according to an embodiment of the present invention;

[0050] Figure 2 A flowchart of another welding method provided by an embodiment of the present invention;

[0051] Figure 3 Schematic diagram of the structure of the welding device provided in the embodiment of the present invention Figure 1 ;

[0052] Figure 4 Schematic diagram of the structure of the welding device provided in the embodiment of the present invention Figure 2 ;

[0053] Figure 5 Schematic diagram of the structure of the welding assembly in the welding device provided in the embodiment of the present invention Figure 1 ;

[0054] Figure 6 Schematic diagram of the structure of the welding assembly in the welding device provided in the embodiment of the present invention Figure 2 ;

[0055] Figure 7 Schematic diagram of the structure of the welding assembly and the pressing belt assembly in the welding device provided in the embodiment of the present invention Figure 1 ;

[0056] Figure 8 Schematic diagram of the structure of the welding assembly and the pressing belt assembly in the welding device provided in the embodiment of the present invention Figure 2 ;

[0057] Figure 9 Schematic diagram of the structure of the welding assembly and the pressing belt assembly in the welding device provided in the embodiment of the present invention Figure 3 ;

[0058] Figure 10 This is a schematic structural diagram of a pressure belt assembly in a welding device provided in an embodiment of the present invention.

[0059] Reference numerals:

[0060] 1-welding assembly, 11-welding pressure wheel mechanism, 111-welding pressure wheel, 1111-welding front pressure wheel, 1112-welding rear pressure wheel, 112-first mounting seat, 113-first adjustment mechanism, 114-second mounting seat, 115-first connecting seat, 12-auxiliary pressure wheel mechanism, 121-auxiliary pressure wheel, 1211-pressing surface, 122-third mounting seat, 123-second adjustment mechanism, 124-second connecting seat, 13-welding Source connection mechanism, 131-welding head, 14-main mounting part, 15-light shield, 16-light shield, 17-smoke exhaust structure, 18-first bracket, 2-belt pressing assembly, 21-pressing block, 22-mounting block, 23-second lifting mechanism, 24-second bracket, 3-welding table, 4-transmission assembly, 5-busbar unwinding assembly, 6-pull belt cutting assembly, 7-busbar placement table, 8-first grabbing assembly, 9-busbar, 10-conductive backplane. DETAILED DESCRIPTION

[0061] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0062] First, refer to Figure 1 The embodiment of the present invention also discloses a welding method, which is applied to Figures 3 to 10The welding device shown includes a movable welding assembly 1, the welding assembly 1 includes a welding pressure wheel mechanism 11 and an auxiliary pressure wheel mechanism 12, the welding pressure wheel mechanism 11 includes a rotatable welding pressure wheel 111, and the auxiliary pressure wheel mechanism 12 includes at least one rotatable auxiliary pressure wheel 121; the auxiliary pressure wheel 121 has a pressing surface 1211 without a groove, and the auxiliary pressure wheel mechanism 12 is located on the side of the welding pressure wheel mechanism 11 in the opposite direction to the welding travel direction of the welding assembly 1; the welding pressure wheel 111 and the auxiliary pressure wheel 121 are both used to press the bus bar 9 onto the conductive backplane 10, and the auxiliary pressure wheel 121 is also used to flatten a section of the bus bar 9 after welding.

[0063] Reference Figure 1 , the welding method comprises:

[0064] Step 101, placing a conductive back plate on a welding table, and placing a bus bar on the conductive back plate;

[0065] Step 102: Using a welding pressing wheel mechanism in a movable welding assembly to press the end of the busbar onto the conductive back plate, and moving the welding assembly along a welding direction;

[0066] Step 103, during the movement of the welding assembly, the busbar is pressed onto the conductive backplane using the welding pressure wheel in the welding pressure wheel mechanism and the auxiliary pressure wheel mechanism in the welding assembly, and at least one rotatable auxiliary pressure wheel in the auxiliary pressure wheel mechanism is used to flatten the welded section of the busbar.

[0067] Among them, the busbar 9 itself has a tin layer. The conductive backplane 10 is used for the interconnection of multiple back contact cells. The front of the back contact cell is not blocked by grid lines, which can effectively reduce optical losses and improve power generation efficiency. The back contact cell can specifically be an IBC (interdigitated back contact cell), a TBC (tunneling oxide passivation contact and interdigitated back contact cell), an HBC (heterojunction back contact cell), etc. The back contact cell can be a multi-main grid cell or a main grid-free cell. The conductive backplane 10 has a metal foil, and the busbar 9 is specifically welded to the metal foil of the conductive backplane 10. The metal foil in the conductive backplane 10 can be a copper foil. In this case, the conductive backplane 10 is a copper foil backplane.

[0068] The number of welding pressure wheels 111 can be at least two, and the number of welding pressure wheels 111 can be two, three, etc. The number of welding pressure wheels 111 is preferably two. The welding pressure wheel 111 is provided with a plurality of grooves, and the plurality of grooves are arranged at intervals along the axial direction of the welding pressure wheel 111. The grooves provided on the welding pressure wheel 111 are used to allow the tin material on the busbar 9 to flow out during the welding process. By providing grooves on the welding pressure wheel 111, the contact area between the welding pressure wheel 111 and the molten tin can also be reduced, thereby preventing the tin material from sticking to the pressure wheel. The number of auxiliary pressure wheels 121 can be one, two, three, etc., and the number of auxiliary pressure wheels 121 is preferably two.

[0069] The welding direction of the welding assembly 1 is also the moving direction of the welding assembly 1 during the welding process. Figures 5 to 9 The direction opposite to the welding direction of the welding assembly 1 can be referred to as Figure 5 and Figure 6 The direction indicated by the arrow D. The welding pressure wheel 111 is used to press the busbar 9 onto the conductive backboard 10 at the beginning of welding, that is, the welding pressure wheel 111 is used to provide downward pressure at the beginning of welding to press the busbar 9 onto the conductive backboard 10. In the subsequent welding process, the auxiliary pressure wheel 121 will also provide downward pressure to press the busbar 9 onto the conductive backboard 10. After welding, the auxiliary pressure wheel 121 will also smooth out the unsolidified tin or tin slag on the welded section of the busbar 9. When there are two auxiliary pressure wheels 121, one auxiliary pressure wheel 121 close to the welding pressure wheel mechanism 11 is used to smooth out the unsolidified tin or tin slag on the welded section, and the other auxiliary pressure wheel 121 is used to smooth out the unsolidified tin or tin slag on the welded section again.

[0070] Reference Figure 3 and Figure 4 The welding apparatus further includes a welding table 3, at least one conveyor assembly 4, at least one first gripping assembly 8, a second gripping assembly, a first lifting slide, and a second lifting slide. The welding table 3 serves as a support surface for welding the busbar 9 to the conductive backing plate 10. The conveyor assembly 4 may include a conveyor belt, and is used to convey the conductive backing plate 10. The second gripping assembly is used to grip the conductive backing plate 10 conveyed by the conveyor assembly 4 onto the welding table 3. The first gripping assembly 8 is used to grip the busbar 9 onto the conductive backing plate 10 on the welding table 3.

[0071] The welding assembly 1 is connected to a first lifting slide, to which the first bracket 18 of the welding assembly 1 is slidably connected. The first lifting slide is connected to a first moving mechanism, which is connected to the first bracket 18 and is used to move the welding assembly 1. The first grabbing assembly 8 is connected to the second lifting slide.

[0072] The number of the conveying components 4 can be 1 to 10. The length direction of the welding table 3 can refer to Figure 4 The direction indicated by the arrow A in FIG. When there are multiple conveying assemblies 4, the multiple conveying assemblies 4 are arranged at intervals along the length direction of the welding table 3. In the direction perpendicular to the length direction of the welding table 3, the welding table 3 is located between the conveying assembly 4 and the busbar placement table 7. The direction perpendicular to the length direction of the welding table 3 can be referred to Figure 4 The arrow in B shows the direction.

[0073] The conductive back plate can be placed on the welding table 3 by the second grabbing assembly, and the bus bar 9 can be placed on the conductive back plate 10 by the first grabbing assembly 8. Before welding, the welding pressure wheel mechanism 11 and the auxiliary pressure wheel mechanism 12 are located above the bus bar 9. By lowering the first lifting slide, the welding pressure wheel mechanism 11 can be pressed on the end of the bus bar 9. The welding assembly 1 can be moved along the welding direction by controlling the first moving mechanism connected to the first lifting slide. After the welding assembly 1 moves along the welding direction, the welding pressure wheel mechanism 11 and the auxiliary pressure wheel mechanism 12 jointly press the bus bar 9 onto the conductive back plate 10, and the auxiliary pressure wheel 121 in the auxiliary pressure wheel mechanism 12 will also smooth out the unsolidified tin material or tin slag on the section after welding.

[0074] In an embodiment of the present invention, when a section of the busbar 9 is welded, the welding pressure wheel 111 and the auxiliary pressure wheel 121 provide downward pressure to press the busbar 9 against the conductive backplane 10. After the section is welded, the auxiliary pressure wheel 121 provides downward pressure to press the welded section against the conductive backplane 10. The cooperation between the auxiliary pressure wheel 121 and the welding pressure wheel 111 can improve the pressing effect of the busbar 9 and avoid the yield of the photovoltaic module including the busbar 9 and the conductive backplane 10 being affected by the cold solder joint. In addition, the auxiliary pressure wheel 121 will also smooth out the unsolidified tin material or tin slag on the welded section to ensure the flatness of the surface of the welded section of the busbar 9, reduce the uneven tin slag remaining after welding, and thus avoid the risk of the tin slag piercing the packaging film or the battery cell. There is a groove on the welding pressure wheel 111, which can allow the tin on the busbar 9 to flow out during the welding process, and can effectively avoid the accumulation of solder at the end of the busbar 9; there is no groove on the pressing surface of the auxiliary pressure wheel 121, which can ensure the flattening effect of the welded section of the busbar 9.

[0075] In an optional embodiment of the present invention, a busbar is pressed onto a conductive backplane using a welding pressure wheel in a welding pressure wheel mechanism and an auxiliary pressure wheel mechanism in a welding assembly, and a welded section of the busbar is flattened using at least one rotatable auxiliary pressure wheel in the auxiliary pressure wheel mechanism, comprising: firstly pressing at least one side of a first section of the busbar being welded using the welding pressure wheel mechanism providing a first downward force, and pressing one side of the first section in a direction opposite to a welding direction of the welding assembly using the auxiliary pressure wheel mechanism providing a second downward force, and then flattening the welded first section using the auxiliary pressure wheel mechanism providing the second downward force;

[0076] The first downward force is smaller than the second downward force, the first downward force is provided by the first elastic member connected to the welding pressure wheel mechanism 11, and the second downward force is provided by the second elastic member connected to the auxiliary pressure wheel mechanism 12. Figure 5 and Figure 8 The welding assembly 1 further includes a main mounting member 14, to which the welding pressure wheel mechanism 11 and the auxiliary pressure wheel mechanism 12 are connected via a first elastic member and a second elastic member, respectively. When the welding pressure wheel 111 and the auxiliary pressure wheel 121 press the busbar 9 onto the conductive backplane 10, the downward elastic force provided by the first elastic member is less than the downward elastic force provided by the second elastic member.

[0077] Both the first and second elastic members can be springs. They are used to provide a vertical elastic force during the welding process, perpendicular to the surface of the conductive backplate 10 that is welded to the busbar 9. By selecting different springs, the elastic force provided by the first elastic member can be different from the elastic force provided by the second elastic member. The main mounting member 14 can be directly connected to the first bracket 18 in the welding assembly 1, or it can be connected to the first bracket 18 via a first lifting mechanism.

[0078] The downward elastic force provided by the first elastic member acts on the welding pressure wheel 111, so that the welding pressure wheel 111 presses the bus bar 9 onto the conductive back plate 10 with a first downward force. The downward elastic force provided by the second elastic member acts on the auxiliary pressure wheel 121, so that the auxiliary pressure wheel 121 flattens the tin slag after welding with a second downward force. When the welding pressure wheel 111 and the auxiliary pressure wheel 121 press the bus bar 9 onto the conductive back plate 10, the downward elastic force provided by the first elastic member can be 1N-5N, and the downward elastic force provided by the second elastic member can be 6N-30N. At this time, the first downward force is 1N-5N, and the second downward force is 6N-30N. The first section of the bus bar 9 being welded can be referred to Figure 8 and Figure 9The first section, indicated by the arrow E, can be located between the head and tail ends of the busbar 9. During the welding process of the first section, the welding pressure roller 111 and the auxiliary pressure roller 121 first apply appropriate pressure to the busbar 9 to press the busbar 9 onto the conductive backplane 10. After the first section is welded, the auxiliary pressure roller 121 flattens the tin slag on the first section under the action of a greater elastic force to ensure that the tin slag is flattened.

[0079] The number of welding pressure rollers 111 in the welding pressure roller mechanism 11 is at least two, and the at least two welding pressure rollers 111 include a front welding pressure roller 1111 and a rear welding pressure roller 1112. The welding pressure roller mechanism that provides a first downward force is first used to press at least one side of the first section of the busbar being welded, including: first using the front welding pressure roller of the welding pressure roller mechanism that provides the first downward force to press on one side of the first section of the busbar being welded along the welding direction, and using the rear welding pressure roller of the welding pressure roller mechanism that provides the first downward force to press on one side of the first section of the busbar being welded in the direction opposite to the welding direction of the welding assembly. In this embodiment, the front welding pressure roller 1111 and the rear welding pressure roller 1112 of the welding pressure roller mechanism that provides the first downward force are respectively pressed on both sides of the first section of the busbar being welded along the length direction of the busbar 9 to ensure the pressing effect of the welding pressure roller mechanism 11 on the busbar 9.

[0080] In an alternative embodiment of the present invention, referring to Figure 2 , welding methods include:

[0081] Step 201, cutting the long busbar to obtain a busbar group;

[0082] Step 202 , placing at least one conductive back plate on a welding table, and placing at least one bus bar on the at least one conductive back plate;

[0083] Step 203: Using a welding pressing wheel mechanism in a movable welding assembly to press the first end of the first busbar onto the conductive backplane, and moving the welding assembly along the welding direction;

[0084] Step 204: During the movement of the welding assembly, the busbar is pressed onto the conductive backplane using the welding pressing wheel in the welding pressing wheel mechanism and the auxiliary pressing wheel mechanism in the welding assembly, and the welded section of the busbar is flattened using at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism.

[0085] Step 205 : When the welding of the last bus bar is completed, the welding assembly stops moving along the welding direction.

[0086] Among them, the welding device also includes a busbar unwinding component 5, a pull tape cutting component 6, at least one busbar placement table 7 and a third gripping component. The busbar unwinding component 5 is used to unwind the busbar roll, and the unwinding can be performed by a servo motor. The pull tape cutting component 6 is used to pull the long busbar from the busbar roll and cut the long busbar. The third gripping component is used to grab the cut busbar 9 onto the busbar placement table 7. The busbar placement table 7 is used to place the cut busbar 9, and the first gripping component 8 is used to grab the busbar 9 placed on the busbar placement table 7 onto the conductive backplane 10 on the welding table 3. The number of busbar placement tables 7, the number of first gripping components 8 and the number of conveying components 4 are equal.

[0087] The long busbar is cut by the pull-belt cutting assembly 6. Each busbar group may include three busbars 9. After the long busbar is cut, the busbar group is grabbed onto the busbar placement table 7 by the third grabbing assembly, and the busbar group placed on the busbar placement table 7 is grabbed onto the conductive backplate 10 on the welding table 3 by the first grabbing assembly 8. Multiple busbar groups can be placed on multiple conductive backplates 10 at the same time through multiple first grabbing assemblies 8. In this embodiment, after the long busbar is cut, multiple busbar groups can be placed on multiple conductive backplates 10 at the same time. During welding, the welding assembly 1 moves along the welding direction to achieve welding of multiple busbars 9 located on the same straight line, which is beneficial to improving welding efficiency.

[0088] In an optional embodiment of the present invention, the welding assembly 1 further includes a welding source mechanism 13; moving the welding assembly along the welding direction includes: activating the welding source mechanism and moving the welding assembly along the welding direction; after moving the welding assembly along the welding direction, further including: during the movement of the welding assembly, when the welding assembly moves to the gap between two adjacent bus bars, shutting off the welding source mechanism. In this embodiment, when the welding assembly 1 moves to the gap between two adjacent bus bars 9, the welding source mechanism 13 can be shut off to prevent the conductive back plate 10 from being welded through in the gap between the two adjacent bus bars 9 due to the welding source mechanism 13 not being shut off.

[0089] In an optional embodiment of the present invention, the welding device also includes a movable pressure belt assembly 2, which is located on one side of the welding assembly 1 along the welding travel direction of the welding assembly 1; the pressure belt assembly 2 includes a pressure block 21, a mounting block 22 and a third elastic member, and the pressure block 21 is connected to the mounting block 22 through the third elastic member.

[0090] The welding pressure roller mechanism in the welding assembly is used to press the leading end of the first busbar onto the conductive backing plate, including: using a movable pressure belt assembly to press the trailing end of the first busbar onto the conductive backing plate, and using the welding pressure roller mechanism in the welding assembly to press the leading end of the first busbar onto the conductive backing plate. After the welding assembly is moved in the welding direction, upon completion of welding the last busbar, and before the welding assembly stops moving in the welding direction, the method further includes: during the movement of the welding assembly, when the distance between the welding assembly and the pressure belt assembly is less than a preset distance, causing the pressure belt assembly to move to the next busbar at a preset speed and press the trailing end of the next busbar onto the conductive backing plate, wherein the preset speed is greater than the movement speed of the welding assembly.

[0091] The belt press assembly 2 further includes a second bracket 24 and a second lifting mechanism 23, with the mounting block 22 connected to the second bracket 24 via the second lifting mechanism 23. The belt press assembly 2 is connected to a first lifting slide, and the second bracket 24 in the belt press assembly 2 is slidably connected to the second lifting slide. The first lifting slide is connected to a second moving mechanism, which is connected to the second bracket 24 and is used to drive the belt press assembly 2 to move. The preset distance is greater than zero and can be set according to actual needs, for example, to one-third or one-quarter the length of the busbar 9.

[0092] When the press belt assembly 2 moves to the next busbar at a preset speed, the second lifting mechanism 23 first raises the pressing block 21 to lift it. Then, by controlling the second moving mechanism connected to the first lifting slide, the press belt assembly 2 moves along to the next busbar. When the press belt assembly 2 moves to the end of the next busbar, the second lifting mechanism 23 lowers the pressing block 21 so that the pressing block 21 presses the end of the next busbar 9 onto the conductive backplane 10. In this embodiment, the above arrangement can prevent the welding assembly 1 from colliding with the press belt assembly 2 during movement.

[0093] Secondly, refer to Figures 3 to 10 An embodiment of the present invention discloses a welding device, including a movable welding assembly 1, the welding assembly 1 including a welding pressure wheel mechanism 11 and an auxiliary pressure wheel mechanism 12, the welding pressure wheel mechanism 11 including a welding pressure wheel 111, the auxiliary pressure wheel mechanism 12 including at least one rotatable auxiliary pressure wheel 121; the auxiliary pressure wheel 121 has a pressing surface 1211 without a groove, and the auxiliary pressure wheel mechanism 12 is located on one side of the welding pressure wheel mechanism 11 in a direction opposite to the welding travel direction of the welding assembly 1; the welding pressure wheel 111 and the auxiliary pressure wheel 121 are both used to press the bus bar 9 onto the conductive backplane 10, and the auxiliary pressure wheel 121 is also used to flatten a section of the bus bar 9 after welding.

[0094] In an embodiment of the present invention, when a section of the busbar 9 is welded, the welding pressure wheel 111 and the auxiliary pressure wheel 121 provide downward pressure to press the busbar 9 against the conductive backplane 10. After the section is welded, the auxiliary pressure wheel 121 provides downward pressure to press the welded section against the conductive backplane 10. The cooperation between the auxiliary pressure wheel 121 and the welding pressure wheel 111 can improve the pressing effect of the busbar 9 and avoid the yield of the photovoltaic module including the busbar 9 and the conductive backplane 10 caused by the poor solder joint. In addition, the auxiliary pressure wheel 121 will also smooth out the unsolidified tin material or tin slag on the welded section to ensure the flatness of the surface of the busbar 9 after welding, reduce the uneven tin slag remaining after welding, and thus avoid the risk of the tin slag piercing the packaging film or the solar cell. There is a groove on the welding pressure wheel 111, which can allow the tin on the busbar 9 to flow out during the welding process, and can effectively avoid the accumulation of solder at the end of the busbar 9; there is no groove on the pressing surface of the auxiliary pressure wheel 121, which can ensure the flattening effect of the welded section of the busbar 9.

[0095] In an alternative embodiment of the present invention, referring to Figure 5 and Figure 8 The welding assembly 1 also includes a main mounting part 14, and the welding pressure wheel mechanism 11 and the auxiliary pressure wheel mechanism 12 are connected to the main mounting part 14 through a first elastic part and a second elastic part respectively; when the welding pressure wheel 111 and the auxiliary pressure wheel 121 press the bus bar 9 onto the conductive backplane 10, the downward elastic force provided by the first elastic part is less than the downward elastic force provided by the second elastic part.

[0096] The first elastic member and the second elastic member can both be springs. Both the first elastic member and the second elastic member are used to provide an elastic force in a vertical direction during the welding process, with the vertical direction being perpendicular to the surface of the conductive backplate 10 used for welding to the busbar 9. By selecting different springs, the elastic force provided by the first elastic member can be different from the elastic force provided by the second elastic member. The welding assembly 1 also includes a first bracket 18, to which the main mounting member 14 can be directly connected, or the main mounting member 14 can be connected to the first bracket 18 via a first lifting mechanism.

[0097] The downward elastic force provided by the first elastic member acts on the welding pressure wheel 111, so that the welding pressure wheel 111 presses the busbar 9 onto the conductive backplate 10. The downward elastic force provided by the second elastic member acts on the auxiliary pressure wheel 121, so that the auxiliary pressure wheel 121 flattens the tin slag after welding. When the welding pressure wheel 111 and the auxiliary pressure wheel 121 press the busbar 9 onto the conductive backplate 10, the downward elastic force provided by the first elastic member can be 1N-5N, and the downward elastic force provided by the second elastic member can be 6N-30N. During the welding process, first, appropriate pressure is applied to the busbar 9 by the welding pressure wheel 111 to press the busbar 9 onto the conductive backplate 10. After welding, the auxiliary pressure wheel 121 flattens the tin slag under the action of a larger elastic force to ensure that the tin slag can be flattened.

[0098] In an alternative embodiment of the present invention, referring to Figure 5 The welding assembly 1 also includes a welding source mechanism 13, and the welding source mechanism 13 has a welding head 131 at one end close to the welding pressure wheel mechanism 11; the number of welding pressure wheels 111 is at least two, and the at least two welding pressure wheels 111 include a rear welding pressure wheel 1112, which is located on one side of the welding head 131 in the opposite direction to the welding travel direction of the welding assembly 1, and the surface of the rear welding pressure wheel 1112 is provided with an anti-stick coating.

[0099] The welding source mechanism 13 is used to provide energy during the welding process, thereby welding the busbar 9 pressed onto the conductive backing plate 10 to the conductive backing plate 10. The welding method of the busbar 9 and the conductive backing plate 10 can be laser welding. In this case, the welding source mechanism 13 is a laser emitter, and the welding head 131 is a laser emitter. The material of the anti-stick coating can be set according to actual needs, for example, polytetrafluoroethylene, polyethylene, etc.

[0100] After welding one section of busbar 9, post-weld pressure roller 1112 moves over the melted tin layer of the post-weld section, providing downward pressure and pressing the post-weld section against conductive backsheet 10. If post-weld pressure roller 1112 is not provided with an anti-stick coating, tin residue will adhere to post-weld pressure roller 1112. During subsequent welding, the tin residue will fall onto busbar 9 or conductive backsheet 10, affecting the yield of the photovoltaic module. In this embodiment, the provision of an anti-stick coating prevents tin residue from adhering to the surface of post-weld pressure roller 1112, thereby preventing tin residue from falling onto busbar 9 or conductive backsheet 10 during subsequent welding.

[0101] In an alternative embodiment of the present invention, referring to Figure 5The welding pressure roller mechanism 11 further includes a first mounting base 112, to which the post-weld pressure roller 1112 is rotatably connected. The welding assembly 1 further includes a light shielding plate 15, which is connected to the first mounting base 112 and is located on a side of the post-weld pressure roller 1112 that is closer to the welding head 131. During laser welding, the light shielding plate 15 can block the laser, thereby preventing the anti-stick coating on the post-weld pressure roller 1112 from being damaged by the laser.

[0102] In an alternative embodiment of the present invention, referring to Figure 6 , at least two welding pressure wheels 111 also include a front welding pressure wheel 1111, which is located on one side of the welding head 131 along the welding travel direction of the welding component 1; along the welding travel direction of the welding component 1, the distance between the front welding pressure wheel 1111 and the rear welding pressure wheel 1112 is greater than or equal to 5 cm and less than or equal to 13 cm.

[0103] Among them, the welding pressure wheel mechanism 11 also includes a second mounting base 114, and the welding front pressure wheel 1111 is rotatably connected to the second mounting base 114. The welding front pressure wheel 1111 is used to press the head position of the busbar 9 at the beginning of welding to prevent the busbar 9 from tilting at the beginning of welding. Along the welding direction of the welding assembly 1, the distance between the welding front pressure wheel 1111 and the welding rear pressure wheel 1112 can be 5cm, 6cm, 8cm, 10cm, 11cm, 13cm, etc. In this embodiment, when the distance between the welding front pressure wheel 1111 and the welding rear pressure wheel 1112 is within the above range, the time for tin solidification can be extended without affecting the laser, thereby reducing the possibility of tin sticking to the welding rear pressure wheel 1112 and avoiding light blocking caused by too small a spacing.

[0104] In an alternative embodiment of the present invention, referring to Figures 5 to 7 The welding pressure wheel mechanism 11 also includes a first adjusting mechanism 113 and a first connecting seat 115. The first mounting seat 112 is connected to the first adjusting mechanism 113. The first adjusting mechanism 113 is connected to the first connecting seat 115. The first adjusting mechanism 113 is used to adjust the position of the first mounting seat 112 along the spacing direction of the front welding pressure wheel 1111 and the rear welding pressure wheel 1112.

[0105] Among them, the two ends of the first elastic member are respectively connected to the first connecting seat 115 and the main mounting member 14. The spacing direction of the pre-welding pressure wheel 1111 and the post-welding pressure wheel 1112 is parallel to the welding travel direction of the welding assembly 1. The first adjustment mechanism 113 can be an electric adjustment mechanism or a manual adjustment mechanism. When the first adjustment mechanism 113 is a manual adjustment mechanism, the first adjustment mechanism 113 includes a first adjustment seat and a first fastener group. The first fastening group may include a first bolt, a first nut, etc. A waist-shaped hole is provided on the first adjustment seat, and the first fastening group connects the first adjustment seat to the first connecting seat 115 through the waist-shaped hole on the first adjustment seat. By loosening the first nut, the position of the first adjustment seat relative to the first connecting seat 115 can be adjusted. After the position of the first adjustment seat is adjusted, the position of the first mounting seat 112 is adjusted accordingly. After the position of the first mounting seat 112 is adjusted, the position of the post-welding pressure wheel 1112 is adjusted accordingly. In this embodiment, the position of the rear welding pressure wheel 1112 can be adjusted, so that the distance between the front welding pressure wheel 1111 and the rear welding pressure wheel 1112 can be adjusted according to the size of different laser spots to adapt to different sizes of laser spots.

[0106] In an alternative embodiment of the present invention, referring to Figure 6 and Figure 7 The auxiliary pressing wheel mechanism 12 also includes a third mounting seat 122, and the auxiliary pressing wheel 121 is rotatably connected to the third mounting seat 122. The auxiliary pressing wheel mechanism 12 also includes a second adjusting mechanism 123 and a second connecting seat 124. The third mounting seat 122 is connected to the second adjusting mechanism 123, and the second adjusting mechanism 123 is connected to the second connecting seat 124. The second adjusting mechanism 123 is used to adjust the position of the auxiliary pressing wheel 121 along the spacing direction between the front welding pressing wheel 1111 and the rear welding pressing wheel 1112.

[0107] Among them, the two ends of the second elastic member are respectively connected to the second connecting seat 124 and the main mounting member 14. The second adjusting mechanism 123 can be an electric adjusting mechanism or a manual adjusting mechanism. When the second adjusting mechanism 123 is a manual adjusting mechanism, the second adjusting mechanism 123 includes a second adjusting seat and a second fastener group. The second fastening group may include a second bolt, a second nut, etc. A waist-shaped hole is provided on the second adjusting seat, and the second fastening group connects the second adjusting seat to the second connecting seat 124 through the waist-shaped hole on the second adjusting seat. By loosening the second nut, the position of the second adjusting seat relative to the second connecting seat 124 can be adjusted. After the position of the second adjusting seat is adjusted, the position of the third mounting seat 122 is adjusted accordingly. In this embodiment, the position of the auxiliary pressure wheel 121 can be adjusted, so that the distance between the auxiliary pressure wheel 121 and the welding pressure wheel 1112 can be adjusted according to different needs.

[0108] In an alternative embodiment of the present invention, referring to Figures 7 to 10The welding device also includes a movable pressing belt assembly 2, which is located on one side of the welding assembly 1 along the welding travel direction of the welding assembly 1; the pressing belt assembly 2 includes a pressing block 21, a mounting block 22 and a third elastic member, and the pressing block 21 is connected to the mounting block 22 through the third elastic member. The pressing block 21 is used to press the bus bar 9 onto the conductive backplane 10.

[0109] Among them, the third elastic member can be a spring. The pressing block 21 has a pressing surface away from the mounting block 22, and the pressing surface has embossing. The pressing belt assembly 2 also includes a second bracket 24 and a second lifting mechanism 23, and the mounting block 22 is connected to the second bracket 24 through the second lifting mechanism 23. The second lifting mechanism 23 can be an electric push rod, a cylinder, etc. During welding, the length of the busbar 9 is uncertain. When the length of the busbar 9 is small, the friction between the busbar 9 and the conductive backplate 10 is small. When welding just starts, that is, when the head position of the busbar 9 is welded, the busbar 9 is easily squeezed away by the welding pressure wheel 111. In this embodiment, when welding just starts, the pressing block 21 will press the busbar 9 onto the conductive backplate 10, which can prevent the busbar 9 from shifting and avoid the busbar 9 being squeezed away by the welding pressure wheel 111.

[0110] In an alternative embodiment of the present invention, referring to Figure 5 The welding assembly 1 further includes a smoke exhaust structure 17, which is located above the welding pressure wheel 111 and the auxiliary pressure wheel 121. The smoke exhaust structure 17 has a smoke exhaust port, which is connected to a smoke exhaust machine.

[0111] The welding assembly 1 further includes a light shield 16, which can be connected to the welding source mechanism 13 and is located directly above the welding pressure wheel 111 and the auxiliary pressure wheel 121. The light shield 16 can prevent the laser from being continuously reflected and burning the springs, circuits, pipes, etc. above during the laser welding process.

[0112] The smoke exhaust structure 17 is specifically a smoke exhaust pipe, which is connected to the interior of the light shield 16, and the smoke exhaust port is located at the end of the smoke exhaust pipe away from the light shield 16. The smoke exhaust fan can be a fan. During welding, flux is used at the contact point between the conductive backplane 10 and the busbar 9, which will cause smoke to be generated during the welding process. If the smoke cannot be sucked away in time, it will contaminate the conductive backplane 10. In this embodiment, during the welding process, the smoke exhaust fan is started to provide suction, and the smoke generated during welding is sucked away through the smoke exhaust pipe, which can prevent the smoke from contaminating the copper foil backplane, thereby preventing the power and yield of the photovoltaic module including the copper foil backplane and the busbar from being affected.

[0113] The process of welding the busbar 9 to the conductive back plate 10 by the above-mentioned welding device may include:

[0114] The conductive back plate 10 is transported by the conveying assembly 4 and is grabbed onto the welding table 3 by the second grabbing assembly; at the same time, the busbar unwinding assembly 5 starts unwinding, and the strip cutting assembly 6 pulls the long busbar of the specified length for cutting. After cutting, the busbar unwinding assembly 5 stops unwinding; the cut busbar 9 is grabbed onto the busbar placement table 7 by the third grabbing assembly, and the busbar 9 placed on the busbar placement table 7 is grabbed onto the conductive back plate 10 on the welding table 3 by the first grabbing assembly 8; then, the welding assembly 1 moves to the head of the busbar 9 Before welding, the front pressure wheel 1111 presses the head end of the busbar 9, and the section of the busbar 9 to be welded is located directly below the welding head 131. The pressure block 21 presses the end of the busbar 9 to ensure that the busbar 9 will not be squeezed away when welding starts; thereafter, the welding source mechanism 13 is started, and the entire welding assembly 1 moves along the welding direction to weld the entire busbar 9; when the entire welding assembly 1 moves close to the pressure belt assembly 2, the pressure block 21 will be lifted and moved quickly along the welding direction to move to the next section of the busbar 9.

[0115] In other embodiments, after a portion of the busbar 9 is welded, the pressing block 21 may be lifted and moved to the next section of the busbar 9 .

[0116] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0117] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A welding method, characterized in that: include: Placing a conductive back plate on a welding table, and placing a bus bar on the conductive back plate; Using a welding pressing wheel mechanism in a movable welding assembly to press the end of the busbar onto the conductive back plate, and moving the welding assembly along a welding advancing direction; During the movement of the welding assembly, the busbar is pressed onto the conductive back plate by using the welding pressing wheel in the welding pressing wheel mechanism and the auxiliary pressing wheel mechanism in the welding assembly, and a section of the busbar after welding is flattened by using at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism; Wherein, the auxiliary pressing wheel mechanism is located on one side of the welding pressing wheel mechanism along a direction opposite to the welding travel direction of the welding assembly; and the auxiliary pressing wheel has a pressing surface without a groove.

2. The welding method according to claim 1, characterized in that: The method of pressing the busbar onto the conductive back plate by using the welding pressing wheel in the welding pressing wheel mechanism and the auxiliary pressing wheel mechanism in the welding assembly, and flattening a welded section of the busbar by using at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism, comprises: First, a welding pressing wheel mechanism providing a first downward force is used to press at least one side of a first section being welded in the busbar, and an auxiliary pressing wheel mechanism providing a second downward force is used to press on one side of the first section in a direction opposite to a welding direction of the welding assembly, and then, the auxiliary pressing wheel mechanism providing the second downward force is used to flatten the welded first section; The first downward force is smaller than the second downward force, the first downward force is provided by a first elastic member connected to the welding pressing wheel mechanism, and the second downward force is provided by a second elastic member connected to the auxiliary pressing wheel mechanism.

3. The welding method according to claim 2, characterized in that: The method of first pressing at least one side of the first section being welded in the busbar by using a welding pressing wheel mechanism providing a first downward force comprises: First, a front welding pressure wheel in a welding pressure wheel mechanism providing a first downward force is used to press the first section of the busbar being welded on one side along the welding travel direction, and a rear welding pressure wheel in a welding pressure wheel mechanism providing a first downward force is used to press the first section on one side along the direction opposite to the welding travel direction of the welding assembly.

4. The welding method according to claim 1, characterized in that: Before placing the conductive back plate on the welding table and placing the bus bar on the conductive back plate, the method further includes: Cutting the long bus bar to obtain a bus bar group, wherein the bus bar group includes a plurality of bus bars arranged at intervals; Placing the conductive back plate on the welding table and placing the bus bar on the conductive back plate comprises: Placing at least one conductive back plate on a welding table, and placing at least one bus bar group on at least one of the conductive back plates; The method of using a welding pressing wheel mechanism in a movable welding assembly to press the end of the busbar onto the conductive back plate and moving the welding assembly along a welding direction includes: Using a welding pressing wheel mechanism in a movable welding assembly to press the first end of the first bus bar onto the conductive back plate, and moving the welding assembly along the welding direction; During the movement of the welding assembly, at least one rotatable welding pressing wheel in the welding pressing wheel mechanism and at least one rotatable auxiliary pressing wheel in the auxiliary pressing wheel mechanism are used to press the bus bar onto the conductive back plate, and after the auxiliary pressing wheel is used to flatten the welded bus bar, the method further includes: When the welding of the last bus bar is completed, the welding assembly stops moving along the welding travel direction.

5. The welding method according to any one of claims 1 to 4, characterized in that: The welding assembly also includes a welding source mechanism; The moving of the welding assembly along the welding direction comprises: Start the welding source mechanism and move the welding assembly along the welding travel direction; After moving the welding assembly along the welding direction, the method further comprises: During the movement of the welding assembly, when the welding assembly moves to the gap between two adjacent bus bars, the welding source mechanism is closed.

6. The welding method according to claim 4, characterized in that: The method of using a welding pressing wheel mechanism in a movable welding assembly to press the first end of the first bus bar onto the conductive backplane comprises: The end of the first busbar is pressed onto the conductive back plate by using a movable pressing belt assembly, and the head end of the first busbar is pressed onto the conductive back plate by using a welding pressing wheel mechanism in a movable welding assembly, wherein the pressing belt assembly is located on one side of the welding assembly along the welding direction of the welding assembly; the pressing belt assembly comprises a pressing block, a mounting block and a third elastic member, and the pressing block is connected to the mounting block via the third elastic member; After moving the welding assembly along the welding direction and before stopping the welding assembly from moving along the welding direction when the last busbar is welded, the method further includes: During the movement of the welding assembly, when the distance between the welding assembly and the pressing belt assembly is less than a preset distance, the pressing belt assembly is moved to the next bus bar at a preset speed and the end of the next bus bar is pressed onto the conductive backplane, wherein the preset speed is greater than the moving speed of the welding assembly.

7. A welding device, characterized in that: The invention comprises a movable welding assembly, wherein the welding assembly comprises a welding pressing wheel mechanism and an auxiliary pressing wheel mechanism, wherein the welding pressing wheel mechanism comprises a rotatable welding pressing wheel, and the auxiliary pressing wheel mechanism comprises at least one rotatable auxiliary pressing wheel; The auxiliary pressing wheel has a pressing surface without a groove, and the auxiliary pressing wheel mechanism is located on one side of the welding pressing wheel mechanism in a direction opposite to the welding travel direction of the welding assembly; The welding pressing wheel and the auxiliary pressing wheel are both used to press the busbar onto the conductive back plate, and the auxiliary pressing wheel is also used to flatten a section of the busbar after welding.

8. The welding device according to claim 7, characterized in that: The welding assembly further comprises a main mounting member, and the welding pressing wheel mechanism and the auxiliary pressing wheel mechanism are respectively connected to the main mounting member through a first elastic member and a second elastic member; When the welding pressing wheel and the auxiliary pressing wheel press the busbar onto the conductive back plate, the downward elastic force provided by the first elastic member is smaller than the downward elastic force provided by the second elastic member.

9. The welding device according to claim 7 or 8, characterized in that: The welding assembly further comprises a welding source mechanism, wherein one end of the welding source mechanism close to the welding pressure wheel mechanism has a welding head; The number of the welding pressure wheels is at least two, and the at least two welding pressure wheels include a welding rear pressure wheel, which is located on one side of the welding head in a direction opposite to the welding travel direction of the welding assembly, and the surface of the welding rear pressure wheel is provided with an anti-stick coating.

10. The welding device according to claim 9, characterized in that: The welding pressure wheel mechanism also includes a first mounting seat, and the welding rear pressure wheel is rotatably connected to the first mounting seat. The welding assembly also includes a shading plate, which is connected to the first mounting seat and is located on the side of the welding rear pressure wheel close to the welding head.

11. The welding device according to claim 10, characterized in that: At least two of the welding pressure wheels further include a welding front pressure wheel, and the welding front pressure wheel is located on one side of the welding head along the welding travel direction of the welding assembly; Along the welding direction of the welding assembly, the distance between the welding front pressure wheel and the welding rear pressure wheel is greater than or equal to 5 cm and less than or equal to 13 cm.

12. The welding device according to claim 11, characterized in that The welding pressure wheel mechanism also includes a first adjustment mechanism and a first connecting seat. The first mounting seat is connected to the first adjustment mechanism. The first adjustment mechanism is connected to the first connecting seat. The first adjustment mechanism is used to adjust the position of the first mounting seat along the spacing direction between the front welding pressure wheel and the rear welding pressure wheel.

13. The welding device according to claim 7 or 8, characterized in that: The welding device further comprises a movable belt pressing assembly, wherein the belt pressing assembly is located at one side of the welding assembly along the welding travel direction of the welding assembly; The pressing belt assembly includes a pressing block, a mounting block and a third elastic member. The pressing block is connected to the mounting block via the third elastic member. The pressing block is used to press the busbar onto the conductive backplane.

14. The welding device according to claim 7 or 8, characterized in that: The welding assembly further comprises a smoke exhaust structure, wherein the smoke exhaust structure is located above the welding pressure wheel and the auxiliary pressure wheel, and the smoke exhaust structure has a smoke exhaust port, and the smoke exhaust port is connected to a smoke exhaust machine.

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