Bus bar pressing mechanism and junction box welding machine

Abstract

The utility model provides a bus bar pressing mechanism and a junction box welding machine. The bus bar pressing mechanism comprises a lifting driving mechanism, a mounting support, a first air cylinder, a second air cylinder, a first pressing assembly and a second pressing assembly. The first cylinder and the second cylinder are arranged on the mounting bracket; the first pressing assembly is connected to the lower end of a telescopic rod of the first cylinder. The second pressing assembly is connected to the lower end of a telescopic rod of the second cylinder. The lifting driving mechanism drives the mounting support to descend to drive the first pressing assembly and the second pressing assembly to press one bus bar to the corresponding conducting strip, and the first air cylinder and the second air cylinder apply preset equal pressure to the second pressing assembly and the second pressing assembly. According to the bus bar pressing mechanism, the lower pressure exerted on the first pressing assembly and the second pressing assembly by the first air cylinder and the second air cylinder is equal, and the pressing force exerted on the two conducting strips is kept equal when the height difference exists between the two conducting strips, so that subfissure of battery pieces in the battery string assembly caused by overlarge local pressure is avoided.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cell assembly production, and specifically to a busbar pressing mechanism and a junction box welding machine. Background Art

[0002] After the battery string array and the glass plate are laminated and bonded together to form a battery string assembly, the junction box needs to be installed on the battery string assembly to make the final photovoltaic module. The junction box installation includes the following process: fix the junction box on the battery string assembly and allow the two bus bars on the battery string assembly to pass into the junction box; then, press the two bus bars onto the conductive sheet of the junction box; finally, weld the two bus bars to the corresponding conductive sheets. Before welding the bus bar to the junction box, the bus bar needs to be pressed onto the conductive sheet of the junction box.

[0003] The junction box installed on the battery string assembly sometimes has a height difference between the two conductive sheets on the junction box due to manufacturing problems or other installation problems. The existing busbar clamping mechanism usually includes a lifting drive and two clamping assemblies, and the two clamping assemblies are respectively installed on the driving end of the lifting drive mechanism so that they can float up and down through springs. When in use, the lifting drive mechanism drives the two clamping assemblies to descend together, and the two clamping assemblies respectively clamp the two busbars on the corresponding conductive sheets.

[0004] In order to ensure that both clamping assemblies can clamp the busbar, the lifting drive mechanism will drive the clamping assemblies to over-press, so that the clamping assemblies move upward to compress the spring after receiving the reaction force of the busbar. When there is a height difference between the two conductive sheets of the junction box, the clamping assembly corresponding to the conductive sheet in the higher position moves upward a lot, and accordingly, the spring corresponding to the clamping assembly is compressed a lot, resulting in the clamping force on the conductive sheet in the higher position being greater than the clamping force on the conductive sheet in the lower position. This large local pressure can easily cause hidden cracks in the battery cells in the battery string assembly. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a busbar pressing mechanism and a junction box welding machine, which adopt the following technical solutions:

[0006] A busbar pressing mechanism is used to press two busbars on a battery string assembly onto two conductive sheets in a junction box in a one-to-one correspondence. The busbar pressing mechanism includes a lifting drive mechanism, a mounting bracket, a first cylinder, a second cylinder, a first pressing assembly, and a second pressing assembly, wherein:

[0007] The mounting bracket is connected to the movable part of the lifting drive mechanism, and the lifting drive mechanism is used to drive the mounting bracket to rise and fall;

[0008] The first cylinder and the second cylinder are disposed on a mounting bracket;

[0009] The first clamping assembly is connected to the lower end of the telescopic rod of the first cylinder, and the second clamping assembly is connected to the lower end of the telescopic rod of the second cylinder;

[0010] The lifting drive mechanism drives the mounting bracket to descend, driving the first clamping assembly and the second clamping assembly to respectively clamp a bus bar to the corresponding conductive sheet. In the process, the first cylinder is configured to always apply a predetermined first downward pressure to the first clamping assembly; the second cylinder is configured to always apply a predetermined second downward pressure to the second clamping assembly, and the first downward pressure is equal to the second downward pressure.

[0011] The busbar clamping mechanism provided in the present application has a first clamping assembly and a second clamping assembly respectively connected to the telescopic rods of the first cylinder and the second cylinder. In the process of the first clamping assembly and the second clamping assembly pressing down the corresponding busbar, the first cylinder and the second cylinder can always give the first clamping assembly and the second clamping assembly a predetermined downward pressure, that is, no matter how much the telescopic rods of the first cylinder and the second cylinder are retracted, the downward pressure exerted by the first cylinder and the second cylinder on the first clamping assembly and the second clamping assembly is always a predetermined value and is equal. In this way, even if there is a height difference between the two conductive sheets, the clamping force exerted on the two conductive sheets can always remain equal, thereby avoiding hidden cracks in the battery cells inside the battery string assembly due to excessive local pressure.

[0012] In some embodiments, the busbar clamping mechanism also includes a compressed air source, a first pipeline and a second pipeline, wherein: one end of the first pipeline and the second pipeline are respectively connected to the compressed air source, the other end of the first pipeline is connected to the rodless chamber of the first cylinder, and the other end of the second pipeline is connected to the rodless chamber of the second cylinder; the rod chamber of the first cylinder and the rod chamber of the second cylinder are respectively connected to the atmosphere; the first pipeline and the second pipeline are respectively provided with pressure reducing valves, or the first pipeline and the second pipeline are connected to the compressed air source through the same pressure reducing valve; the compressed air source is used to always provide compressed air to the rodless chambers of the first cylinder and the second cylinder, and the pressure reducing valve is used to adjust the pressure of the compressed air entering the rodless chamber, so that the first cylinder always applies a predetermined first downward pressure to the first clamping assembly, and the second cylinder always applies a predetermined second downward pressure to the second clamping assembly.

[0013] By setting a pressure reducing valve, pressure regulation in the first pipeline and the second pipeline is achieved, so that the pressure in the rodless chamber of the first cylinder and the rodless chamber of the second cylinder always remain equal, and finally the telescopic rod of the first cylinder and the telescopic rod of the second cylinder respectively apply predetermined and equal forces to the first clamping assembly and the second clamping assembly.

[0014] In some embodiments, both the first pipeline and the second pipeline are provided with a speed regulating valve, and the speed regulating valve is used to adjust the flow rate of the compressed air entering the rodless chamber.

[0015] The speed regulating valve adjusts the flow rate of the compressed air entering the rodless cavity, thereby realizing flexible adjustment of the extension and retraction speed of the telescopic rod.

[0016] In some embodiments, the second clamping assembly has the same structure as the first clamping assembly, and the first clamping assembly includes an adapter plate and a pressure claw, wherein the adapter plate is connected to the lower end of the telescopic rod of the first cylinder, and the pressure claw is installed on the adapter plate.

[0017] By providing the adapter plate, a stable connection between the pressing claw and the telescopic rod of the first cylinder is achieved.

[0018] In some embodiments, the second pressing assembly and the first pressing assembly are respectively provided with a blowing block, and the blowing block is configured to blow air to the welding position of the busbar during the busbar welding process.

[0019] The air blowing block blows air to the welding position of the busbar during the busbar welding process, which helps to improve the welding quality.

[0020] In some embodiments, the pressing claw includes a main body, a first pressing foot and a second pressing foot, wherein the main body is fixedly connected to the adapter plate, the first pressing foot and the second pressing foot are spaced apart on the main body, and a welding avoidance channel is formed between the first pressing foot and the second pressing foot; the first pressing foot and the second pressing foot are configured to press the bus bar onto the corresponding conductive sheet from two different positions, and the position of the bus bar to be welded is located at the avoidance channel.

[0021] The first presser foot and the second presser foot press the busbar to the corresponding conductive sheet from two different positions, ensuring that the busbar can be closely attached to the conductive sheet, and preventing the busbar from arching or warping due to uneven force. In addition, the avoidance channel between the first presser foot and the second presser foot exposes the position of the busbar to be welded, and the busbar welding mechanism implements welding on the position of the busbar to be welded through the avoidance channel.

[0022] In some embodiments, the busbar clamping mechanism also includes a sensor arranged on the mounting bracket, and a sensor block matching the sensor is arranged on the adapter plate, and the sensor block is located below the sensor; the sensor is connected to the lifting drive mechanism signal; when the lifting drive mechanism drives the mounting bracket to descend, driving the pressing claw to press the busbar to the corresponding conductive sheet, the sensor block rises toward the sensor driven by the adapter plate, and when the rising stroke of the sensor block reaches a predetermined value, the sensor is triggered to generate a stop signal, and the lifting drive mechanism stops driving the mounting bracket to descend after receiving the stop signal.

[0023] By limiting the descending height of the mounting bracket, it can be achieved that when the pressing claws and

[0024] After the pressing claws of the second pressing assembly have completed over-pressing the corresponding busbar, the lifting drive mechanism immediately stops driving the mounting bracket to descend, thereby ensuring effective pressing of the busbar.

[0025] In some embodiments, the sensor is a contact displacement sensor or a laser displacement sensor.

[0026] Two optional displacement sensor types are provided, both of which can meet the measurement of the rising stroke of the sensing block.

[0027] In some embodiments, the busbar clamping mechanism also includes a wind knife disposed on the mounting bracket, the wind knife being disposed above the first clamping assembly and the second clamping assembly, and the wind knife being configured to blow air horizontally, obliquely upward, or obliquely downward during the busbar welding process.

[0028] The air knife forms an air curtain above the welding position during the busbar welding process, thereby preventing impurities generated during the welding process from rising and contaminating components such as the busbar welding mechanism above.

[0029] The present application also provides a junction box welding machine, which includes a conveying mechanism, a busbar clamping mechanism as described in any of the above items, and a laser welding mechanism, wherein: the conveying mechanism is configured to convey a battery string assembly to deliver the junction box on the battery string assembly to a welding station; the busbar clamping mechanism is configured to move above the welding station to clamp the two busbars on the battery string assembly onto two conductive sheets in the junction box in a one-to-one correspondence; the laser welding mechanism is configured to move above the welding station to weld the two clamped busbars to the corresponding conductive sheets by laser.

[0030] Through the cooperation of the conveying mechanism, the busbar pressing mechanism and the laser welding mechanism, the junction box welding machine in the embodiment of the present application realizes automatic welding of the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the busbar pressing mechanism in an embodiment of the present application at a first viewing angle;

[0032] Figure 2 is a schematic structural diagram of the busbar pressing mechanism in the embodiment of the present application at a second viewing angle;

[0033] Figure 3 is a schematic structural diagram of the busbar pressing mechanism in the embodiment of the present application at a third viewing angle;

[0034] Figure 4 is a schematic structural diagram of the busbar pressing mechanism in the embodiment of the present application at a fourth viewing angle;

[0035] Figure 5 Schematic diagram of the structure of the pressure claw in the embodiment of the present application;

[0036] Figure 6 This is a schematic diagram of the structure of a cylinder air supply circuit in one embodiment of the present application;

[0037] Figure 7 This is a schematic structural diagram of a cylinder air supply circuit in another embodiment of the present application.

[0038] Figures 1 to 7 Included:

[0039] Mounting bracket 1, first cylinder 2, second cylinder 3, first clamping assembly 4, second clamping assembly 5, compressed air source 6, first pipeline 7, second pipeline 8, pressure reducing valve 9, speed regulating valve 10, third pipeline 11, fourth pipeline 12, solenoid reversing valve 13, sensor 14, sensor block 15, air knife 16, air intake pipeline 17, adapter plate 41, pressure claw 42, blowing block 43, main body 421, first pressure foot 422, second pressure foot 423, avoidance channel 424, blowing port 431. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] The busbar is clamped by the existing busbar clamping mechanism. When there is a height difference between the two conductive sheets of the junction box, the clamping force on the conductive sheet at the higher position is greater than the clamping force on the conductive sheet at the lower position, which may eventually cause hidden cracks in the battery cells in the battery string assembly.

[0042] To this end, the present application provides a busbar pressing machine, which is used to press the two busbars on the battery string assembly onto the two conductive plates in the junction box in a one-to-one correspondence, and can ensure that the pressure on the two busbars always remains equal, thereby avoiding the battery string assembly from being subjected to excessive local pressure, causing hidden cracks in the battery cells therein.

[0043] like Figure 1 to Figure 2 As shown, the busbar clamping mechanism in the embodiment of the present application includes a lifting drive mechanism (not shown in the figure), a mounting bracket 1, a first cylinder 2, a second cylinder 3, a first clamping assembly 4 and a second clamping assembly 5, wherein:

[0044] The mounting bracket 1 is connected to a movable component of a lifting drive mechanism, and the lifting drive mechanism is used to drive the mounting bracket 1 to rise and fall.

[0045] The first cylinder 2 and the second cylinder 3 are arranged on the mounting bracket 1 .

[0046] The first pressing assembly 4 is connected to the lower end of the telescopic rod of the first cylinder 2 , and the second pressing assembly 5 is connected to the lower end of the telescopic rod of the second cylinder 3 .

[0047] When the lifting drive mechanism drives the mounting bracket 1 to descend, it drives the first pressing assembly 4 and the second pressing assembly 5 to press a bus bar onto the corresponding conductive sheet respectively. During the pressing process, the first cylinder 2 is configured to always apply a predetermined first downward pressure to the first pressing assembly 4, and the second cylinder 3 is configured to always apply a predetermined second downward pressure to the second pressing assembly 5, and the first downward pressure is equal to the second downward pressure.

[0048] The busbar clamping mechanism in the embodiment of the present application has a first clamping assembly 4 and a second clamping assembly 5 connected to the telescopic rods of the first cylinder 2 and the second cylinder 3, respectively. When the first clamping assembly 4 and the second clamping assembly 5 are pressing down the corresponding busbar, the first cylinder 2 and the second cylinder 3 can always give the first clamping assembly 4 and the second clamping assembly 5 a predetermined downward pressure. Regardless of the amount of retraction of the telescopic rods of the first cylinder 2 and the second cylinder 3, the downward pressure exerted by the first cylinder 2 and the second cylinder 3 on the first clamping assembly 4 and the second clamping assembly 5 is always a predetermined value and equal. Therefore, even if there is a height difference between the two conductive sheets on the junction box, the clamping force exerted on the two conductive sheets can always remain equal, thereby avoiding the occurrence of hidden cracks in the battery cells in the battery string assembly due to excessive local pressure.

[0049] The predetermined downward pressure exerted by the first cylinder 2 and the second cylinder 3 on the first pressing assembly 4 and the second pressing assembly 5 can be a preset downward pressure of a constant magnitude, or a preset downward pressure within a specific range.

[0050] In order to enable the first cylinder 2 and the second cylinder 3 to always provide a predetermined downward pressure to the first clamping assembly 4 and the second clamping assembly 5. The busbar clamping mechanism in the embodiment of the present application also includes a cylinder air supply system consisting of a compressed air source, a first pipeline and a second pipeline, and the cylinder air supply system is used to supply air to the first cylinder 2 and the second cylinder 3, so that the telescopic rods of the first cylinder 2 and the second cylinder 3 press down the first clamping assembly 4 and the second clamping assembly 5 with a predetermined downward pressure. The structure and working process of the cylinder air supply system will be described exemplarily through two embodiments below.

[0051] like Figure 6 As shown, in one embodiment, one end of the first pipeline 7 and the second pipeline 8 are respectively connected to the compressed air source 6, the other end of the first pipeline 7 is connected to the rodless chamber of the first cylinder 2, and the other end of the second pipeline 8 is connected to the rodless chamber of the second cylinder 3. The rod chamber of the first cylinder 2 and the rod chamber of the second cylinder 3 are respectively connected to the atmosphere, and the first pipeline 7 and the second pipeline 8 are also provided with pressure reducing valves 9, respectively.

[0052] The compressed gas in the compressed air source 6 enters into the rodless cavity of the first cylinder 2 and the rodless cavity of the second cylinder 3 through the first pipeline 7 and the second pipeline 8 respectively, and the telescopic rod of the first cylinder 2 and the telescopic rod of the second cylinder 3 remain extended under the pressure of the compressed air; when the lifting drive mechanism drives the mounting bracket 1 to descend, the first clamping assembly 4 and the second clamping assembly 5 clamp the corresponding bus bars. During this process, the telescopic rods of the first cylinder 2 and the second cylinder 3 retract upward after being compressed.

[0053] Since the first pipeline 7 and the second pipeline 8 are both provided with pressure reducing valves 9, the pressures in the first pipeline 7 and the second pipeline 8 are adjusted respectively by the two pressure reducing valves 9, so that the pressures in the rodless chamber of the first cylinder 2 and the rodless chamber of the second cylinder 3 are always kept equal. Finally, the telescopic rod of the first cylinder 2 and the telescopic rod of the second cylinder 3 press down the first clamping assembly 4 and the second clamping assembly 5 with a predetermined and equal downward pressure.

[0054] Optionally, both the first pipeline 7 and the second pipeline 8 are provided with a speed regulating valve 10, wherein the speed regulating valve 10 on the first pipeline 7 is used to regulate the flow rate of the compressed air entering the rodless chamber of the first cylinder 2, thereby realizing flexible regulation of the telescopic speed of the telescopic rod of the first cylinder 2. Similarly, the speed regulating valve 10 on the second pipeline 8 is used to regulate the flow rate of the compressed air entering the rodless chamber of the second cylinder 3, thereby realizing flexible regulation of the telescopic speed of the telescopic rod of the second cylinder 3.

[0055] Continue to refer Figure 6 As shown, optionally, the cylinder air supply system further includes a third pipeline 11 and a fourth pipeline 12 and an electromagnetic reversing valve 13, wherein the first valve port of the electromagnetic reversing valve 13 is connected to the compressed air source 6 via the air intake pipeline 17, and one end of the first pipeline 7 and the second pipeline 8 are respectively connected to the second valve port of the electromagnetic reversing valve 13. One end of the third pipeline 11 is connected to the rod chamber of the first cylinder 2, one end of the fourth pipeline 12 is connected to the rod chamber of the second cylinder 3, and the other ends of the third pipeline 11 and the fourth pipeline 12 are respectively connected to the third valve port of the electromagnetic reversing valve 13, and the third pipeline 11 and the fourth pipeline 12 are connected to the atmosphere through the muffler on the electromagnetic reversing valve 13.

[0056] like Figure 7 As shown, the cylinder air supply system in another embodiment of the present application is Figure 6 The structures of the cylinder air supply systems in the illustrated embodiments are basically the same. For the sake of simplicity, only the cylinder air supply systems are described. Figure 6 The differences between the cylinder gas supply systems in the illustrated embodiments are described in detail below. For the remaining identical parts, please refer to the previous description of Figure 6 Relevant description of the cylinder air supply system in the illustrated embodiment.

[0057] and Figure 6 The cylinder air supply system in the embodiment shown is different in that: Figure 7 In the cylinder air supply system of the illustrated embodiment, the first pipeline 7 and the second pipeline 8 are connected to the compressed air source 6 through the same pressure reducing valve 9.

[0058] The compressed gas in the compressed air source 6 enters into the rodless cavity of the first cylinder 2 and the rodless cavity of the second cylinder 3 through the first pipeline 7 and the second pipeline 8 respectively. The telescopic rod of the first cylinder 2 and the telescopic rod of the second cylinder 3 remain extended under the push of the compressed air; when the lifting drive mechanism drives the mounting bracket 1 to descend, the first clamping assembly 4 and the second clamping assembly 5 clamp the corresponding bus bars. During this process, the telescopic rods of the first cylinder 2 and the second cylinder 3 retract upward after being compressed.

[0059] Since the first pipeline 7 and the second pipeline 8 are connected to the compressed air source 6 through the same pressure reducing valve 9, the pressure reducing valve 9 can uniformly adjust the pressure in the first pipeline 7 and the second pipeline 8, so that the pressure in the rodless chamber of the first cylinder 2 and the rodless chamber of the second cylinder 3 are always kept equal. Finally, the telescopic rod of the first cylinder 2 and the telescopic rod of the second cylinder 3 press down the first clamping assembly 4 and the second clamping assembly 5 with a predetermined and equal downward pressure.

[0060] Continue to refer Figure 1 to Figure 2 As shown, optionally, the second clamping assembly 4 has the same structure as the first clamping assembly 5. Taking the first clamping assembly 4 as an example, it includes an adapter plate 41 and a pressure claw 42, wherein the adapter plate 41 is connected to the lower end of the telescopic rod of the first cylinder 2, and the pressure claw 42 is installed on the adapter plate 41. When the lifting drive mechanism drives the mounting bracket 1 to descend, the pressure claw 42 presses the bus bar onto the corresponding conductive sheet.

[0061] By providing the adapter plate 41 , a stable connection between the pressing claw 42 and the telescopic rod of the first cylinder 2 is achieved.

[0062] like Figure 5 As shown, optionally, the pressing claw 42 includes a body 421, a first pressing foot 422 and a second pressing foot 423, wherein the body 421 is fixedly connected to the adapter plate 41, the first pressing foot 422 and the second pressing foot 423 are arranged on the body 421 at intervals, and a welding avoidance channel 424 is formed between the first pressing foot 422 and the second pressing foot 423. When the lifting drive mechanism drives the mounting bracket 1 to descend, the first pressing foot 422 and the second pressing foot 423 press the busbar to the corresponding conductive sheet from two different positions, and the position of the busbar to be welded is located at the avoidance channel 424. In this way, it can be ensured that the busbar can be closely attached to the conductive sheet to prevent the busbar from being arched or tilted due to uneven force. The busbar welding mechanism can implement welding on the position of the busbar to be welded through the avoidance channel 424.

[0063] Optionally, a blowing block 43 is further provided on the adapter plate 41 of the second clamping assembly 5 and the first clamping assembly 4, and a blowing port 431 is provided at the bottom of the blowing block 43. The blowing block 43 is configured to blow air to the welding position of the busbar through the blowing port 431 during the busbar welding process, which helps to improve the welding quality.

[0064] like Figure 3 to Figure 4 As shown, optionally, the first clamping assembly 4 and the second clamping assembly 5 are both correspondingly provided with a sensor 14 and a sensor block 15. Still taking the first clamping assembly 4 as an example, the sensor 14 is provided on the mounting bracket 1, the sensor block 15 is provided on the adapter plate 41 and matches the sensor 14, the sensor block 15 is located below the sensor 14, and the sensor 14 is connected to the lifting drive mechanism signal.

[0065] The lifting drive mechanism drives the mounting bracket 1 to descend, driving the pressing claw 42 to press the busbar to the corresponding conductive sheet, and the pressing claw 42 moves upward after being pressed, and the induction block 15 rises toward the inductor 14 driven by the adapter plate 41. When the rising stroke of the induction block 15 reaches a predetermined value, the inductor 14 is triggered to generate a stop signal.

[0066] When the two conductive sheets on the junction box are at the same level, the induction block 15 corresponding to the first clamping assembly 4 and the induction block 15 corresponding to the second clamping assembly 5 are always kept at the same height during the rising process, and finally the corresponding two sensors 14 are triggered at the same time to generate a stop signal, and the lifting drive mechanism stops driving the mounting bracket 1 to descend after receiving the stop signal. When there is a height difference between the two conductive sheets on the junction box, there is a height difference between the induction block 15 corresponding to the first clamping assembly 4 and the induction block 15 corresponding to the second clamping assembly 5 during the rising process, which causes the corresponding two sensors 14 to be triggered successively to generate a stop signal, and the lifting drive mechanism stops driving the mounting bracket 1 to descend only after receiving the latter stop signal.

[0067] By limiting the descending height of the mounting bracket, it can be achieved that when the pressing claw 42 of the first clamping assembly 4 and the pressing claw 42 of the second clamping assembly 5 complete over-pressing the corresponding bus bar, the lifting drive mechanism immediately stops driving the mounting bracket to descend, thereby ensuring effective clamping of the bus bar.

[0068] The sensor 14 may be a contact displacement sensor or a laser displacement sensor, both of which can measure the rising stroke of the sensor block 15 .

[0069] Optionally, the busbar clamping mechanism in the embodiment of the present application also includes a wind knife 16 arranged on the mounting bracket 1, and the wind knife 16 is arranged above the first clamping assembly 4 and the second clamping assembly 5. The wind knife 16 is configured to blow air horizontally, obliquely upward or obliquely downward during the busbar welding process, thereby forming an air curtain located above the welding position, preventing impurities generated during the welding process from rising and contaminating the busbar welding mechanism, positioning camera and other components above.

[0070] A junction box welding machine is also provided in an embodiment of the present application, which includes a conveying mechanism, a busbar clamping mechanism provided in any of the above embodiments, and a laser welding mechanism, wherein: the conveying mechanism is configured to convey the battery string assembly to deliver the junction box on the battery string assembly to the welding station. The busbar clamping mechanism is configured to move above the welding station to clamp the two busbars on the battery string assembly onto the two conductive sheets in the junction box in a one-to-one correspondence. The laser welding mechanism is configured to move above the welding station to weld the two clamped busbars to the corresponding conductive sheets by laser. Through the cooperation of the conveying mechanism, the busbar clamping mechanism and the laser welding mechanism, the junction box welding machine in the embodiment of the present application realizes automatic welding of the junction box.

[0071] The above description of the present application is sufficiently detailed and has certain particularities. Those skilled in the art should understand that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present application should fall within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, not by the above description in the embodiments. Moreover, the embodiments mentioned in the present application are not limited to being implemented individually, and some embodiments can also be implemented in combination.

Claims

1. A busbar pressing mechanism, characterized in that: The busbar pressing mechanism is used to press two busbars on the battery string assembly onto two conductive sheets in the junction box in a one-to-one correspondence. The busbar pressing mechanism includes a lifting drive mechanism, a mounting bracket, a first cylinder, a second cylinder, a first pressing assembly and a second pressing assembly, wherein: The mounting bracket is connected to the movable part of the lifting drive mechanism, and the lifting drive mechanism is used to drive the mounting bracket to rise and fall; The first cylinder and the second cylinder are disposed on the mounting bracket; The first clamping assembly is connected to the lower end of the telescopic rod of the first cylinder, and the second clamping assembly is connected to the lower end of the telescopic rod of the second cylinder; The lifting drive mechanism drives the mounting bracket to descend, driving the first clamping assembly and the second clamping assembly to respectively clamp one of the bus bars to the corresponding conductive sheet. In the process, the first cylinder is configured to always apply a predetermined first downward force to the first clamping assembly; the second cylinder is configured to always apply a predetermined second downward force to the second clamping assembly, and the first downward force is equal to the second downward force.

2. The busbar pressing mechanism according to claim 1, characterized in that: The busbar pressing mechanism further includes a compressed air source, a first pipeline and a second pipeline, wherein: One end of the first pipeline and the second pipeline are respectively connected to the compressed air source, the other end of the first pipeline is connected to the rodless chamber of the first cylinder, and the other end of the second pipeline is connected to the rodless chamber of the second cylinder; The rod chamber of the first cylinder and the rod chamber of the second cylinder are respectively connected to the atmosphere; The first pipeline and the second pipeline are respectively provided with pressure reducing valves, or the first pipeline and the second pipeline are connected to the compressed air source through the same pressure reducing valve; The compressed air source is used to always provide compressed air to the rodless chambers of the first cylinder and the second cylinder, and the pressure reducing valve is used to adjust the pressure of the compressed air entering the rodless chamber, so that the first cylinder always applies a predetermined first downward pressure to the first clamping assembly, and the second cylinder always applies a predetermined second downward pressure to the second clamping assembly.

3. The busbar pressing mechanism according to claim 2, characterized in that: The first pipeline and the second pipeline are both provided with a speed regulating valve, and the speed regulating valve is used to adjust the flow rate of the compressed air entering the rodless cavity.

4. The busbar pressing mechanism according to claim 1, characterized in that: The second clamping assembly has the same structure as the first clamping assembly, and the first clamping assembly includes an adapter plate and a pressure claw, wherein the adapter plate is connected to the lower end of the telescopic rod of the first cylinder, and the pressure claw is installed on the adapter plate.

5. The busbar pressing mechanism according to claim 1, characterized in that: The second pressing assembly and the first pressing assembly are also provided with air blowing blocks respectively, and the air blowing blocks are configured to blow air to the welding position of the busbar during the busbar welding process.

6. The busbar pressing mechanism according to claim 4, characterized in that: The pressing claw comprises a body, a first pressing foot and a second pressing foot, wherein the body is fixedly connected to the adapter plate, the first pressing foot and the second pressing foot are arranged on the body at intervals, and a welding avoidance channel is formed between the first pressing foot and the second pressing foot; The first pressing foot and the second pressing foot are configured to press the bus bar onto the corresponding conductive sheet from two different positions, and the position of the bus bar to be welded is located at the avoidance channel.

7. The busbar pressing mechanism according to claim 4, characterized in that: The busbar pressing mechanism further comprises a sensor arranged on the mounting bracket, and a sensor block matching the sensor is arranged on the adapter plate, and the sensor block is located below the sensor; The sensor is connected to the lifting drive mechanism by signal; The lifting drive mechanism drives the mounting bracket to descend, and drives the pressing claw to press the busbar to the corresponding conductive sheet. The sensing block rises toward the sensor driven by the adapter plate. When the rising stroke of the sensing block reaches a predetermined value, the sensor is triggered to generate a stop signal. After receiving the stop signal, the lifting drive mechanism stops driving the mounting bracket to descend.

8. The busbar pressing mechanism according to claim 7, characterized in that: The sensor is a contact displacement sensor or a laser displacement sensor.

9. The busbar pressing mechanism according to claim 1, characterized in that: The busbar clamping mechanism also includes an air knife arranged on the mounting bracket, the air knife is arranged above the first clamping assembly and the second clamping assembly, and the air knife is configured to blow air horizontally, obliquely upward or obliquely downward during the busbar welding process.

10. A junction box welding machine, characterized in that: The junction box welding machine comprises a conveying mechanism, a busbar pressing mechanism according to any one of claims 1 to 9, and a laser welding mechanism, wherein: The conveying mechanism is configured to convey the battery string assembly to deliver the junction box on the battery string assembly to the welding station; The busbar pressing mechanism is configured to move above the welding station to press two busbars on the battery string assembly onto two conductive sheets in the junction box in a one-to-one correspondence; The laser welding mechanism is configured to move above the welding station and weld the two compressed bus bars to the corresponding conductive sheets by laser.

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