Battery pack automatic spot welding apparatus

Abstract

This invention belongs to the technical field of welding equipment, and particularly relates to an automatic spot welding device for battery packs, comprising a body, a connecting piece feeding mechanism, a connecting piece processing mechanism, a first spot welding mechanism, a second spot welding mechanism, and a transfer mechanism; the body is provided with a first station, a second station, and a third station; the battery feeding mechanism transports batteries to the first and second stations; the connecting piece feeding mechanism transports connecting pieces to the connecting piece processing mechanism; the connecting piece processing mechanism processes the connecting pieces and transports them to the first station; the first spot welding mechanism welds the connecting pieces to the positive electrode of the first battery; the transfer mechanism transfers the first battery after the connecting pieces have been welded to the third station; the second spot welding mechanism welds the connecting pieces to the negative electrode of the second battery. The automatic spot welding device for battery packs according to embodiments of this invention features automated welding and high processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of welding equipment technology, and in particular relates to an automatic spot welding device for battery packs. Background Technology

[0002] Currently, in the production of linear series battery packs, connecting tabs are typically used to connect two adjacent batteries. The usual connection method is flat welding and folding, that is, the two ends of the connecting tab are welded to the negative terminal of one battery and the positive terminal of another battery, and then the connecting tab is bent so that the two batteries are in a straight line.

[0003] The latest welding method involves shortening the connecting pieces and welding them manually. Specifically, one battery is positioned first, then another battery is placed to form an angle with the first battery. The corresponding connecting pieces are then placed, and welding is performed on each piece separately.

[0004] However, the existing manual welding method for connecting pieces is inefficient and results in poor product consistency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is the problem of the existing manual welding method of connecting pieces, and provides an automatic spot welding device for battery packs.

[0006] To solve the above technical problems, embodiments of the present invention provide an automatic spot welding device for battery packs, including a body, a connecting piece feeding mechanism, a connecting piece processing mechanism, a first spot welding mechanism, a second spot welding mechanism, and a transfer mechanism, wherein the battery feeding mechanism, the connecting piece feeding mechanism, the connecting piece processing mechanism, the first spot welding mechanism, the second spot welding mechanism, and the transfer mechanism are disposed on the body;

[0007] The machine body is provided with a first station, a second station and a third station, the first station, the second station and the third station are used to place batteries, and the axis of the battery placed in the second station is perpendicular to the axis of the battery placed in the third station.

[0008] The connecting piece feeding mechanism is used to convey linear connecting pieces to the connecting piece processing mechanism;

[0009] The connecting piece processing mechanism is used to process the connecting piece and transport the processed connecting piece to the first workstation;

[0010] The first spot welding mechanism is used to weld one end of the processed connecting piece to the positive electrode of the first battery;

[0011] The transfer mechanism is used to transfer the first battery after welding the connecting piece from the first station to the third station, so that the positive electrode of the first battery placed at the third station is close to the negative electrode of the second battery placed at the second station, and the other end of the connecting piece welded to the first battery is attached to the negative electrode of the second battery.

[0012] The second spot welding mechanism is used to weld the other end of the connecting piece welded to the first battery to the negative terminal of the second battery so as to connect the first battery and the second battery in series.

[0013] Optionally, the connecting piece feeding mechanism includes a conveying track, a feeding roller, and multiple conveying rollers. The feeding roller is used to mount the connecting piece roll wound into a cylindrical shape. The conveying rollers are used to convey the connecting pieces on the feeding roller to the conveying track, and the conveying track is used to convey the connecting pieces to the connecting piece processing mechanism.

[0014] Optionally, the connecting piece feeding mechanism includes a fixed-length reciprocating component and an extrusion assembly. The extrusion assembly includes an extrusion power component and an extruder. The extruder includes a fixed component and a movable component. The fixed component is disposed at the outlet end of the connecting piece feeding mechanism. The extrusion power component can drive the movable component to move toward the fixed component to press the connecting piece. The fixed-length reciprocating component is connected to the extrusion assembly to drive the extrusion assembly to reciprocate. The reciprocating direction of the fixed-length reciprocating component is the conveying direction of the connecting piece.

[0015] Optionally, the connecting piece processing mechanism includes a reciprocating component, a fixed blade, and a movable shaft. The movable shaft is provided with the bending channel, which is used for the connecting pieces conveyed by the connecting piece processing mechanism to pass through.

[0016] The movable shaft is rotatably connected to the machine body, and the reciprocating component is connected to the movable shaft. The reciprocating component can drive the movable shaft to rotate around the axis of the movable shaft to bend the connecting piece so that the connecting piece is L-shaped. The fixing blade is fixed to the machine body. The fixing blade is arc-shaped and surrounds the outer wall of the movable shaft to cut the connecting piece that has passed through the bending channel when the movable shaft rotates.

[0017] Optionally, the outlet end of the connecting piece processing mechanism and the first station are located at different heights. The connecting piece processing mechanism also includes a displacement mechanism for conveying the cut connecting piece to the first station.

[0018] Optionally, the displacement mechanism includes a displacement power component and a fixture, the output shaft of the displacement power component is connected to the fixture, and the moving direction of the output shaft of the displacement power component is from the outlet end of the connecting piece processing mechanism to the first station;

[0019] The fixture is provided with an adsorption element, which is used to adsorb the end of the connecting piece that is away from the first battery.

[0020] Optionally, the automatic spot welding equipment for battery packs further includes a rotating mechanism for rotating the third station so that the first battery and the second battery are collinear. The rotating mechanism includes a rotating shaft and a rotating power component. The rotating shaft is rotatably connected to the machine body, and the rotating power component is connected to the rotating shaft. The rotation angle of the rotating power component is 90 degrees, so that the rotating power component can drive the third station to rotate so that the first battery placed in the third station and the second battery placed in the second station are collinear.

[0021] Optionally, the rotating mechanism further includes a folding auxiliary plate and an auxiliary power component. The folding auxiliary plate is parallel to the negative electrode of the second battery placed in the second work station. The plane on which one side of the folding auxiliary plate is located is spaced apart from the plane on which the negative electrode of the second battery placed in the second work station is located. The distance between the folding auxiliary plate and the negative electrode of the second battery placed in the second work station is the thickness of the connecting piece.

[0022] The auxiliary power component is connected to the folding auxiliary plate. The auxiliary power component can drive the folding auxiliary plate to be spaced apart along a plane parallel to the plane where the negative electrode of the second battery is located in the second work station. The folding auxiliary plate and the negative electrode of the second battery placed in the second work station are closer to or farther away from the second work station.

[0023] Optionally, the automatic spot welding equipment for battery packs further includes a pushing mechanism, which is used to push the collinear first and second batteries out of the third station; the pushing mechanism includes a push rod and a pushing power component, the axis of the push rod is parallel to the axis of the second battery placed in the second station, the pushing power component is connected to the push rod, and the pushing power component can drive the push rod to reciprocate along the axis of the push rod.

[0024] Optionally, both the first spot welding mechanism and the second spot welding mechanism are spot welding machines. The machine body includes a sliding mechanism. The second spot welding machine and the push rod are mounted on the sliding mechanism. The push rod and the second spot welding machine are slidably connected to the machine body through the sliding mechanism, such that at most one of the push rod and the second spot welding machine is positioned opposite to the second battery in the second workstation.

[0025] According to an embodiment of the present invention, the automatic spot welding equipment for battery packs realizes the feeding of batteries and connecting pieces through a battery feeding mechanism and a connecting piece feeding mechanism, processes the connecting pieces into an L-shape through a connecting piece processing mechanism, transfers the connecting pieces to a second station using a transfer mechanism, then welds the first battery and connecting piece through a first spot welding mechanism, welds the second battery and connecting piece through a second spot welding mechanism, and finally discharges the welded battery through a pushing mechanism. It has a high degree of automation and high production efficiency. Attached Figure Description

[0026] Figure 1 This is an overall schematic diagram of the automatic spot welding equipment for battery packs provided in an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Enlarged view of part A;

[0028] Figure 3 This is a top view schematic diagram of the automatic spot welding equipment for battery packs provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the overall structure of the automatic spot welding equipment for battery packs provided in this embodiment of the invention, without the main body.

[0030] Figure 5 yes Figure 4 Enlarged diagram of part B;

[0031] Figure 6 This is a schematic diagram of the connecting piece processing mechanism of the automatic spot welding equipment for battery packs provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the third station of the automatic spot welding equipment for battery packs provided in this embodiment of the invention before rotation;

[0033] Figure 8 This is a schematic diagram of the third station of the automatic spot welding equipment for battery packs provided in an embodiment of the present invention after rotation;

[0034] Figure 9 This is a structural diagram of the pushing mechanism of the automatic spot welding equipment for battery packs provided in an embodiment of the present invention.

[0035] The reference numerals in the accompanying drawings are as follows:

[0036] 100, First battery; 200, Second battery; 300, Connecting piece;

[0037] 1. Battery feeding mechanism; 11. Conveyor line; 2. Connecting piece feeding mechanism; 21. Feeding roller; 22. Conveying roller; 23. Conveying track; 24. Fixed-length reciprocating component; 25. Fixed component; 26. Moving component; 27. Extrusion power component; 3. Connecting piece processing mechanism; 31. Reciprocating component; 32. Fixed blade; 33. Moving shaft; 34. Bending channel; 35. Displacement power component; 36. Fixture; 4. First spot welding mechanism; 5. Second spot welding mechanism; 61. Rotating shaft; 62. Folding auxiliary plate; 63. Auxiliary power component; 64. Push rod; 65. Pushing power component; 7. Machine body; 71. First station; 72. Second station; 73. Third station; 74. Receiving tank; 8. Spot welding machine. Detailed Implementation

[0038] To make the technical problem solved by the present invention, the technical solution, and the beneficial effects clearer, the following description is provided in conjunction with the accompanying drawings.

[0039] The present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0040] like Figure 1 , Figure 2 and Figure 3As shown in the figure, an automatic spot welding device for battery packs provided in this embodiment of the invention includes a body 7, and further includes a battery feeding mechanism 1, a connecting piece feeding mechanism 2, a connecting piece processing mechanism 3, a first spot welding mechanism 4, a second spot welding mechanism 5, a transfer mechanism, a rotation mechanism, and a pushing mechanism, all respectively disposed on the body 7. The body 7 is provided with a first station 71, a second station 72, and a third station 73. The first station 71, the second station 72, and the third station 73 are used to place a single battery. The axis of the battery placed at the second station 72 is perpendicular to the axis of the battery placed at the third station 73. The battery feeding mechanism 1 transports multiple first batteries 100 to the first station 71 and multiple second batteries 200 to the second station 72. The connecting piece feeding mechanism 2 is used to transport linear connecting pieces 300 to the connecting piece processing mechanism 3. The connecting piece processing mechanism 3 is used to process the connecting piece 300 and transport the processed connecting piece 300 to the first station 71. In this embodiment, processing the connecting piece refers to bending and cutting the linear connecting piece 300 into an L-shape. The first spot welding mechanism 4 is used to weld one end of the connecting piece 300 to the positive electrode of the first battery 100. The transfer mechanism is used to transfer the first battery 100 with the welded connecting piece 300 from the first station 71 to the third station 73, such that the positive electrode of the first battery 100 in the third station 73 is close to the negative electrode of the second battery 200 in the second station 72, and the other end of the connecting piece 300 welded to the first battery 100 is attached to the negative electrode of the second battery 200. The second spot welding mechanism 5 is used to weld the other end of the connecting piece 300 to the negative electrode of the second battery 200, so that the first battery 100 and the second battery 200 are connected in series. The rotating mechanism is used to rotate the third station 73 so that the first battery 100 and the second battery 200 are collinear, and the pushing mechanism is used to push the collinear first battery 100 and the second battery 200 out of the third station.

[0041] Reference Figure 6 and Figure 7 In this invention, the negative electrode of the second battery 200 is welded to the connecting piece 300, and the positive electrode of the first battery 100 is connected to the connecting piece 300. The L-shaped connecting piece 300 is bent into a U-shape by a rotating mechanism, making the first battery 100 and the second battery 200 collinear, thus completing the series connection of the two collinear batteries. In this embodiment, the battery feeding mechanism 1 can be a conveyor line 11 or a robotic arm; preferably, the transfer mechanism in this embodiment is a robotic arm.

[0042] The embodiments of the present invention utilize the above-mentioned mechanism to automate the processing of batteries, enabling two or even multiple batteries to be connected in series. Compared with manual welding connections, this method has the advantages of high automation and increased work efficiency.

[0043] Reference Figure 9In this embodiment, the first station 71, the second station 72, and the third station 73 are all provided with receiving slots 74. The receiving slots 74 of the second station 72 and the third station 73 are open at both ends, meaning the middle part of the receiving slot 74 has the same shape as the battery. The open ends of the receiving slot 74 allow the two ends of the battery to slide in and out of the receiving slot 74 under external force. Furthermore, the length of the receiving slot 74 of the second station 72 in this embodiment can be further extended, allowing for the placement of at least four batteries connected end-to-end. The end of the second station 72 furthest from the third station 73 is the discharge end, from which personnel can remove the battery assembly.

[0044] Reference Figure 4 and Figure 5 Specifically, the connecting piece feeding mechanism 2 includes a conveying track 23, a feeding roller 21 and multiple conveying rollers 22. The feeding roller 21 is used to mount the connecting piece 300 wound into a cylinder, and the conveying rollers 22 are used to convey the connecting piece 300 on the feeding roller 21 to the conveying track 23. The conveying track 23 is used to convey the connecting piece 300 to the connecting piece processing mechanism 3.

[0045] In this embodiment, the connecting piece 300 is made of linear connecting piece 300 wound into a cylindrical shape. During discharge, the rotation of the feeding roller 21 drives the connecting piece 300 to be discharged from the cylinder. Then, through the transmission of the conveying roller 22, the connecting piece 300 is sent into the conveying track 23. The conveying track 23 is a strip groove. The width and depth of the strip groove correspond to the width and thickness of the connecting piece 300, so that the connecting piece 300 moves in the conveying track 23.

[0046] Reference Figure 2 and Figure 6 Furthermore, the connecting piece feeding mechanism 2 includes a fixed-length reciprocating component 24 and an extrusion assembly. The extrusion assembly includes an extrusion power component 27 and an extruder. The extruder includes a fixed component 25 and a movable component 26. The fixed component 25 is fixed to the outlet end of the conveying track 23 and extends along the conveying direction of the connecting piece 300. The movable component 26 is connected to the extrusion power component 27, enabling the extrusion power component 27 to drive the movable component 26 to reciprocate toward the fixed component 25. When the movable component 26 moves close to the fixed component 25, it is used to press the connecting piece. When the movable component 26 moves away from the fixed component 25, it no longer presses the connecting piece. The fixed-length reciprocating component 24 is connected to the extrusion assembly to drive the movable component 26 and the extrusion power component 27 to reciprocate. The reciprocating direction of the fixed-length reciprocating component 24 is the conveying direction of the connecting piece 300.

[0047] In this embodiment, the fixed-length reciprocating component 24 is a cylinder. The output shaft of the cylinder and the connecting piece 300 move in the same direction in the conveying track 23. The reciprocating motion of the fixed-length reciprocating component 24 drives the extrusion assembly to reciprocate. In this embodiment, the extrusion power component 27 is also a cylinder. The movable component 26 is a long strip of iron sheet. The movable component 26 is fixed at one end of the outlet of the conveying track 23. The fixed component 25 is a plate-shaped iron sheet. The reciprocating direction of the extrusion power component 27 is perpendicular to the reciprocating direction of the fixed-length reciprocating component 24, and the extrusion power component 27 moves one side toward the connecting piece 300. The working process is as follows: The fixed-length reciprocating component 24 is in a telescopic state. At this time, the extrusion power component 27 is located at one end near the conveyor track 23. The connecting piece 300 is fed out from the conveyor track 23 and continues to be conveyed towards the fixed component 25 until one side of the connecting piece 300 is in contact with the surface of the fixed component 25. Then, the extrusion power component 27 drives the movable component 26 to move towards the fixed component 25, clamping the connecting piece 300. Afterward, the fixed-length reciprocating component 24 drives the extrusion power component 27 and the movable component 26 towards the end away from the conveyor track 23, causing the connecting piece 300 to slide on the fixed component 25. This ensures that the conveying length of the connecting piece 300 is the extension length of the reciprocating power component, thus achieving the conveying of a certain length of connecting piece 300 to the next process, ensuring that each connecting piece 300 has the same length. After conveying a certain length of connecting piece 300, the extrusion power component 27 drives the movable component 26 away from the fixed component 25, and the reciprocating power component drives the extrusion power component 27 towards the outlet end near the conveyor track 23, preparing for the next conveying.

[0048] Reference Figure 6 In this embodiment, the connecting piece processing mechanism 3 includes a reciprocating component 31, a fixed blade 32, and a movable shaft 33. The movable shaft 33 is provided with a bending channel 34, which is used for the connecting pieces 300 conveyed by the connecting piece processing mechanism 3 to pass through. The connecting pieces 300 conveyed from the conveying track 23 and the extrusion assembly enter the bending channel 34. The bending channel 34 is straight, and the connecting pieces 300 are then output from the outlet of the bending channel 34 to the next process.

[0049] Before the connecting piece 300 is output to the next process, it needs to be bent and cut. The movable shaft 33 is rotatably connected to the machine body 7, and the reciprocating component 31 is connected to the movable shaft 33. The reciprocating component 31 can drive the movable shaft 33 to rotate around its axis, causing one end of the connecting piece 300 to bend. The fixed blade 32 is fixed to the machine body 7 and is arc-shaped, surrounding the outer wall of the movable shaft 33 to cut off the connecting piece that has entered the bending channel 34 when the movable shaft 33 rotates. In this embodiment, when the movable shaft 33 can be connected to a rotary cylinder or motor, when the movable shaft 33 rotates 90 degrees, the connecting piece 300 in the bending channel 34 will bend relative to other connecting pieces 300, forming an L-shaped connecting piece 300. Simultaneously, the movable shaft 33 and the fixed blade 32 shear the connecting piece 300, causing the L-shaped connecting piece 300 to break.

[0050] In this embodiment, the outlet end of the connecting piece processing mechanism 3 and the first station 71 are located at different heights, that is, the outlet end of the connecting piece processing mechanism 3 and the first station 71 are on planes at different heights. Therefore, the connecting piece processing mechanism 3 also includes a displacement mechanism, which is used to transport the cut connecting piece 300 to the first station 71. In this embodiment, the outlet end of the connecting piece processing mechanism 3 is located below the first station 71. Specifically, the displacement mechanism includes a displacement power member 35 and a fixture 36. The output shaft of the displacement power member 35 is connected to the fixture 36, and the direction of movement of the output shaft of the displacement power member 35 is from the outlet end of the connecting piece processing mechanism 3 to the first station 71. In this embodiment, the fixture 36 is provided with an adsorption member, which is used to adsorb the end of the connecting piece 300 away from the battery. In this embodiment, the adsorption member is a magnet, which uses magnetism to adsorb the connecting piece 300. In other embodiments, a suction cup or the like can also be used.

[0051] Reference Figure 7 , Figure 8 and Figure 9 In this embodiment, the rotating mechanism includes a rotating shaft 61 and a rotating power component. The rotating shaft 61 is rotatably connected to the machine body 7, and the rotating power component is connected to the rotating shaft 61. The rotating power component is a cylinder connected to the movable shaft 33 via a linkage mechanism. The rotating power component can drive the movable shaft 33 to rotate by 90 degrees, so that the rotating power component drives the third station 73 to rotate so that the batteries in the third station 73 and the batteries in the second station 72 are collinear. Before rotation, the axis of the receiving slot 74 for placing batteries in the third station 73 is perpendicular to the axis of the receiving slot 74 for placing batteries in the second station 72; after rotation, the receiving slots 74 of the second station 72 and the receiving slots 74 of the third station 73 are collinear.

[0052] In this embodiment, the rotating mechanism further includes a folding auxiliary plate 62 and an auxiliary power component 63. The folding auxiliary plate 62 is parallel to the negative electrode of the second battery 200. The plane on which one side of the folding auxiliary plate 62 is located is spaced apart from the plane on which the negative electrode of the second battery 200 is located. The distance between the folding auxiliary plate 62 and the negative electrode of the second battery 200 is the thickness of the connecting piece 300.

[0053] The auxiliary power component 63 is connected to the folding auxiliary plate 62. The auxiliary power component 63 can drive the folding auxiliary plate 62 to move closer to and away from the second station 72 in a direction parallel to the negative terminal of the second battery 200 placed on the second station 72. In this embodiment, the auxiliary power component 63 is a cylinder. The cylinder drives the folding auxiliary plate 62 to reciprocate. When preparing to rotate, the auxiliary power component 63 drives the folding auxiliary plate 62 to move toward the second battery 200 in the second station 72, so that one side surface of the folding auxiliary plate 62 presses against the connecting piece 300 welded to the negative terminal of the second battery 200. When the rotation begins, since the folding auxiliary plate 62 always presses against the connecting piece 300, although the second battery 200 and the connecting piece 300 in the second station 72 have just been welded, the connection strength will not be affected by the bending of the connecting piece 300.

[0054] In this embodiment, the pushing mechanism includes a push rod 64 and a pushing power component 65. The axis of the push rod 64 is parallel to the axis of the battery in the second station 72. The pushing power component 65 is connected to the push rod 64 and can drive the push rod 64 to reciprocate along the axis of the push rod 64. In this embodiment, when the push rod 64 rotates in the third station 73 until the third station 73 and the second station 72 are collinear, it pushes the third battery into the second station 72. The second battery 200 in the second station 72 moves towards the depth direction of the receiving groove 74 in the second station 72.

[0055] In this embodiment, the first spot welding mechanism 4 and the second spot welding mechanism 5 are both spot welding machines 8. The machine body 7 includes a sliding mechanism. The second spot welding mechanism 5 and the push rod 64 are mounted on the sliding mechanism. The push rod 64 and the second spot welding mechanism 5 are slidably connected to the machine body 7 through the sliding mechanism, so that at most one of the push rod 64 and the second spot welding mechanism 5 is arranged opposite to the battery in the second station 72.

[0056] In this embodiment, the first spot welding mechanism 4 can also be connected to the machine body 7 in a sliding manner, just like the second spot welding mechanism 5, and the sliding is also achieved through another sliding mechanism. In this embodiment, the sliding mechanism can be a slide table, wherein the push rod 64 and the second spot welding machine are set on the slide plate of the slide table, and the slide rail of the slide table is fixed to the machine body 7.

[0057] In other embodiments, the first spot welding mechanism 4 is directly fixed to the body 7, and its position is fixed and does not need to be changed.

[0058] This embodiment can be used to process two batteries connected in series, or to process two or more battery packs connected in series. Processing two batteries connected in series is relatively simple. After the first battery 100 is welded with the connecting piece 300 at the first station 71, it is transferred to the third station 73 by a robot. After the second battery 200 is welded with the connecting piece 300 at the second station 72, the first battery 100 in the third station 73 is rotated, and the push rod 64 pushes out the two collinear battery packs.

[0059] This embodiment can also use the following method to process multiple batteries connected in series. This embodiment takes a linear battery pack composed of a second battery 200 and three first batteries 100 as an example.

[0060] S1, the connecting piece feeding mechanism 2 conveys the connecting piece 300, which is wound into a roll shape, to the connecting piece processing mechanism 3;

[0061] Specifically, the feeding roller 21 is equipped with a connecting piece 300 roll, which is conveyed to the conveying track 23 via the conveying roller 22. The connecting piece 300 is then conveyed to the extrusion assembly via the conveying track 23. A certain length of connecting piece 300 is output to the connecting piece processing mechanism 3 via the fixed-length reciprocating power component and the extrusion assembly.

[0062] S2, the battery feeding mechanism 1 feeds the first battery 100 into the first station 71 and the second battery 200 into the second station 72 respectively;

[0063] S3, after the connecting piece 300 enters the connecting piece processing mechanism 3, the connecting piece 300 is bent, cut and conveyed to the first station 71 by the connecting piece processing mechanism 3;

[0064] Specifically, the connecting piece 300 is fed into the bending channel 34 inside the movable shaft 33. After the expected conveying length is reached, the reciprocating power component extends and retracts to drive the movable shaft 33 to rotate. At this time, the connecting piece 300 located in the bending channel 34 bends relative to other parts. Simultaneously, when the opening of the bending channel 34 rotates to the fixed blade 32, the fixed blade 32 and the movable shaft 33 shear the connecting piece 300, thereby forming an L-shaped connecting piece 300. The movable shaft 33 then returns to its initial position. The L-shaped connecting piece 300 approaches the fixture 36 under the action of subsequent connecting pieces 300 until the connecting piece 300 is attracted by the suction component of the fixture 36. The fixture 36 moves upward under the action of the displacement power component 35 to approach the first station 71 until one end of the connecting piece 300 is in contact with the positive electrode of the first battery 100.

[0065] S4, the first spot welding mechanism 4 welds the connecting piece 300 and the first battery 100 located in the first station 71;

[0066] Specifically, the connecting piece 300 moves to the first station 71 under the drive of the fixture 36 and is attached to the positive electrode of the first battery 100. At this time, the first spot welding mechanism 4 aligns with the connecting piece 300 and welds the connecting piece 300 and the positive electrode of the first battery 100.

[0067] S5, the first battery 100 and the connecting piece 300 after welding are transferred to the third station 73, and the positive electrode of the first battery 100 located in the third station 73 is close to the negative electrode in the second station 72.

[0068] Specifically, the first battery 100 is clamped by a robotic arm and transferred to the receiving groove 74 in the third station 73. At this time, the axis of the receiving groove 74 in the third station 73 is perpendicular to the axis of the receiving groove 74 in the second station 72, and at this time, the other end of the connecting piece 300 is in contact with the negative electrode of the second battery 200.

[0069] S6, the second spot welding mechanism 5 welds the negative electrode of the second battery 200 and the other end of the connecting piece 300;

[0070] Specifically, the second spot welding mechanism 5 moves to the negative electrode of the second battery 200 to begin welding.

[0071] S7, the third station 73 begins to rotate under the drive of the rotating mechanism until the axis of the receiving groove 74 of the third station 73 and the axis of the receiving groove 74 of the second station 72 are collinear.

[0072] Specifically, before the third station 73 starts to rotate, the folding auxiliary plate 62 moves toward the negative terminal of the second battery 200 until the folding auxiliary plate 62 presses the connecting piece 300 and the negative terminal of the second battery 200. The third station 73 starts to rotate until the first battery 100 and the second battery 200 are collinear. At this time, the folding auxiliary plate 62 is pulled out from between the first battery 100 and the second battery 200, that is, the folding auxiliary plate 62 moves toward the end away from the second battery 200.

[0073] S8, the push mechanism pushes the collinear first battery 100 and second battery 200 to the outside;

[0074] Specifically, after the folding auxiliary plate 62 exits between the first battery 100 and the second battery 200, the push rod 64 pushes the first battery 100 and the second battery 200 to move along the axis of the second station 72 in a direction away from the third station 73 until the first battery 100 is located in the second station 72. At this time, the negative terminal of the first battery 100 is located at the original negative terminal position of the second battery 200.

[0075] S9. Repeat steps S2 to S8 three times. At this point, the welding of the battery pack is completed. That is, after the first battery 100 forms two batteries in series with the second battery 200, the first battery 100 is transformed into a new "second battery 200". The first battery 100 that is fed in later is a new "first battery 100". This is repeated three times. The order of the battery pack from the direction away from the third station 73 is the last fed first battery 100, the second fed first battery 100, the first fed first battery 100, and the first fed second battery 200.

[0076] This embodiment only discloses a linear battery pack composed of a second battery 200 and three first batteries 100; in other embodiments, the combination can also be a combination of N second batteries 200 and N first batteries 100, where N is a positive integer.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic spot welding device for battery packs, characterized in that, The device includes a body, a battery feeding mechanism, a connecting piece feeding mechanism, a connecting piece processing mechanism, a first spot welding mechanism, a second spot welding mechanism, and a transfer mechanism. The battery feeding mechanism, the connecting piece feeding mechanism, the connecting piece processing mechanism, the first spot welding mechanism, the second spot welding mechanism, and the transfer mechanism are disposed on the body. The machine body is provided with a first station, a second station and a third station, the first station, the second station and the third station are used to place batteries, and the axis of the battery placed in the second station is perpendicular to the axis of the battery placed in the third station. The connecting piece feeding mechanism is used to convey linear connecting pieces to the connecting piece processing mechanism; The connecting piece processing mechanism is used to process the connecting piece and transport the processed connecting piece to the first workstation; The first spot welding mechanism is used to weld one end of the processed connecting piece to the positive electrode of the first battery; The transfer mechanism is used to transfer the first battery after welding the connecting piece from the first station to the third station, so that the positive electrode of the first battery placed at the third station is close to the negative electrode of the second battery placed at the second station, and the other end of the connecting piece welded to the first battery is attached to the negative electrode of the second battery. The second spot welding mechanism is used to weld the other end of the connecting piece welded to the first battery to the negative terminal of the second battery so as to connect the first battery and the second battery in series. The automatic spot welding equipment for battery packs also includes a rotating mechanism for rotating the third station so that the first battery and the second battery are collinear. The rotating mechanism includes a rotating shaft and a rotating power component. The rotating shaft is rotatably connected to the machine body, and the rotating power component is connected to the rotating shaft so that the rotating power component can drive the third station to rotate so that the first battery placed in the third station and the second battery placed in the second station are collinear.

2. The automatic spot welding equipment for battery packs according to claim 1, characterized in that, The connecting piece feeding mechanism includes a conveying track, a feeding roller, and multiple conveying rollers. The feeding roller is used to mount the connecting piece roll wound into a cylindrical shape. The conveying rollers are used to convey the connecting pieces on the feeding roller to the conveying track. The conveying track is used to convey the connecting pieces to the connecting piece processing mechanism.

3. The automatic spot welding equipment for battery packs according to claim 1, characterized in that, The connecting piece feeding mechanism includes a fixed-length reciprocating component and an extrusion assembly. The extrusion assembly includes an extrusion power component and an extrusion component. The extrusion component includes a fixed component and a movable component. The fixed component is located at the outlet end of the connecting piece feeding mechanism. The extrusion power component can drive the movable component to move towards the fixed component to press the connecting piece. The fixed-length reciprocating component is connected to the extrusion assembly to drive the extrusion assembly to reciprocate. The reciprocating direction of the fixed-length reciprocating component is the conveying direction of the connecting piece.

4. The automatic spot welding equipment for battery packs according to claim 1, characterized in that, The connecting piece processing mechanism includes a reciprocating component, a fixed blade, and a movable shaft. The movable shaft is provided with a bending channel, which is used for the connecting pieces conveyed by the connecting piece processing mechanism to pass through. The movable shaft is rotatably connected to the machine body, and the reciprocating component is connected to the movable shaft. The reciprocating component can drive the movable shaft to rotate around the axis of the movable shaft to bend the connecting piece so that the connecting piece is L-shaped. The fixing blade is fixed to the machine body. The fixing blade is arc-shaped and surrounds the outer wall of the movable shaft to cut the connecting piece that has passed through the bending channel when the movable shaft rotates.

5. The automatic spot welding equipment for battery packs according to claim 1, characterized in that, The outlet end of the connecting piece processing mechanism and the first station are located at different heights. The connecting piece processing mechanism also includes a displacement mechanism, which is used to transport the cut connecting piece to the first station.

6. The automatic spot welding equipment for battery packs according to claim 5, characterized in that, The displacement mechanism includes a displacement power component and a fixture. The output shaft of the displacement power component is connected to the fixture. The moving direction of the output shaft of the displacement power component is from the outlet end of the connecting piece processing mechanism to the first work station. The fixture is provided with an adsorption element, which is used to adsorb the end of the connecting piece that is away from the first battery.

7. The automatic spot welding equipment for battery packs according to claim 1, characterized in that, The rotation angle of the rotating power component is 90 degrees.

8. The automatic spot welding equipment for battery packs according to claim 7, characterized in that, The rotating mechanism also includes a folding auxiliary plate and an auxiliary power component. The folding auxiliary plate is parallel to the negative electrode of the second battery placed in the second work station. The plane on one side of the folding auxiliary plate is spaced apart from the plane on the negative electrode of the second battery placed in the second work station. The distance between the folding auxiliary plate and the negative electrode of the second battery placed in the second work station is the thickness of the connecting piece. The auxiliary power component is connected to the folding auxiliary plate, and the auxiliary power component can drive the folding auxiliary plate to move closer to and away from the second work station in a direction parallel to the negative terminal of the second battery placed on the second work station.

9. The automatic spot welding equipment for battery packs according to claim 1, characterized in that, The automatic spot welding equipment for battery packs also includes a pushing mechanism, which is used to push the collinear first and second batteries out of the third station. The pushing mechanism includes a push rod and a pushing power component. The axis of the push rod is parallel to the axis of the second battery placed in the second station. The pushing power component is connected to the push rod and can drive the push rod to reciprocate along the axis of the push rod.

10. The automatic spot welding equipment for battery packs according to claim 9, characterized in that, Both the first spot welding mechanism and the second spot welding mechanism are spot welding machines. The machine body includes a sliding mechanism. The second spot welding machine and the push rod are mounted on the sliding mechanism. The push rod and the second spot welding machine are slidably connected to the machine body through the sliding mechanism, such that at most one of the push rod and the second spot welding machine is positioned opposite to the second battery in the second workstation.

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