A laser welding device for the busbar of a battery module

Abstract

The present invention discloses a laser welding device for the busbar of a battery module, which relates to the technical field of busbar welding of a power module. It includes a table board, both sides of the table board are fixedly connected with side guard plates, the bottom ends of the side guard plates are fixedly connected with bottom plates, a battery pack is arranged above the table board, a laser welding mechanism is arranged below the table board, a busbar positioning mechanism is arranged above the battery pack, a protection and ventilation mechanism is arranged above the busbar positioning mechanism, a hydraulic rod is fixedly connected to the bottom surface of the table board, side cover plates are arranged on both sides of the protection and ventilation mechanism, the laser welding mechanism includes a lower push plate, and four vertical support rods are fixedly connected to both sides of the top surface of the lower push plate. In the present invention, the lower push plate drives the buffer plate to squeeze the elastic spring to continue moving down through the thin connecting rod, so as to play a role in positioning the battery pack while controlling the laser head to continue moving down close to the busbar line to achieve welding, and improve the welding processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of power module busbar welding, and specifically relates to a laser welding device for battery module busbars. Background Art

[0002] A laser welding device for battery module busbars is a device specifically used for high-precision welding between the busbars of a battery pack and battery cells. The busbars are usually made of metal conductive materials and are used to connect multiple battery cells to form a battery module. During the production process of the battery module, the welding quality of the busbars is crucial for the performance, reliability, and safety of the entire battery pack. The laser welding device for battery module busbars provides an efficient and reliable solution for the assembly of the battery pack through high-precision laser welding technology. It plays an important role in improving production efficiency, ensuring welding quality, and guaranteeing the performance of the battery pack. With the continuous development of battery technology and manufacturing processes, laser welding technology is also continuously improving and innovating to meet the increasing battery demand.

[0003] The patent with the publication number CN221158974U discloses a laser welding device for battery module busbars, which includes a battery module accommodating device. A busbar pressing plate is installed on the battery module accommodating device. The busbar pressing plate and the battery module accommodating device jointly enclose an accommodating cavity for accommodating the battery module. A plurality of pressing members are adjustably installed on the busbar pressing plate along the length direction of the battery module. A pressing structure for pressing the busbar against the battery pole column is provided on the pressing member. A through hole for the laser to pass through is opened on the pressing structure. An avoidance groove for avoiding the pressing structure is opened on the busbar pressing plate; a locking structure is provided between the battery module accommodating device and the busbar pressing plate. Through the locking structure, the pressing structure of the pressing member installed on the busbar pressing plate presses the busbar and the battery pole column, and the relative fixation of the busbar pressing plate and the battery module accommodating device is realized, solving the problem in the prior art that a single busbar pressing plate of the welding device can only adapt to one type of battery module. However, this patent still has the problem that the battery pack fixing steps are too complex, affecting the welding wire arrangement efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a laser welding device for battery module busbars, which solves the problems raised in the above background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A laser welding device for battery module busbars includes a table plate. Side guard plates are fixedly connected to both sides of the table plate. The bottom ends of the side guard plates are fixedly connected to a bottom plate. A battery pack is arranged above the table plate. A laser welding mechanism is arranged below the table plate. A busbar positioning mechanism is arranged above the battery pack. A protection and ventilation mechanism is arranged above the busbar positioning mechanism. A hydraulic rod is fixedly connected to the bottom surface of the table plate. Side cover plates are arranged on both sides of the protection and ventilation mechanism;

[0006] The laser welding mechanism includes a lower push plate. On both sides of the top surface of the lower push plate, four vertical support rods are fixedly connected. At the top ends of the four vertical support rods, a lifting frame is fixedly connected. In the middle of the top surface of the lower push plate, four thin connecting rods are fixedly connected. At the top ends of the four thin connecting rods, a buffer plate is fixedly connected. A side rod connecting plate is arranged between the buffer plate and the lower push plate. On the front and rear sides of the side rod connecting plate, turning arc arms are slidably connected. At the middle positions of two of the turning arc arms, a rotating shaft fixing seat is rotatably connected. At the top end of each turning arc arm, a positioning clamping plate is hingedly connected.

[0007] According to the above technical solution, a slide rail is fixedly connected to the top surface of the lifting frame. Above the slide rail, an electric drive frame is slidably connected. Inside the electric drive frame, a mobile end is slidably connected. At the bottom end of the mobile end, a laser head is fixedly connected. Inside the side surface of the mobile end, a screw rod is rotatably connected. Inside the side cover plate, an upper support frame is fixedly connected.

[0008] According to the above technical solution, the side rod connecting plate is slidably connected to the thin connecting rod. The vertical support rod slides upward from the bottom surface of the table plate and penetrates out of the top surface. Outside the thin connecting rod, a tension spring is arranged, and both ends of the tension spring are fixedly connected to the buffer plate and the lower push plate respectively. The screw rod is rotatably connected to the electric drive frame. The rotating shaft fixing seat is fixedly connected to the table plate. The turning arc arm is slidably connected to the table plate. During welding, the battery pack needs to be moved to a specified position on the table plate. By the hydraulic rod being in the extended state, the connected lower push plate is pushed downward. The movement of the lower push plate drives the connected vertical support rods and the lifting frame to move downward together, so that the electric drive frame on the lifting frame slides along the slide rail through the built-in motor wheel and adjusts the position, and the built-in motor of the electric drive frame is used to drive the connected screw rod to adjust the position of the mobile end on the electric drive frame. When the mobile end drives the laser head to adjust the position, in cooperation with the downward movement of the lifting frame, it approaches the integrated bus bar arranged on the battery pack. The high temperature generated by the laser head is used to weld the bus bar and the electrode contact piece on the battery pack. At the same time, the downward movement of the lower push plate drives the connected thin connecting rods to pull the buffer plate, so that the buffer plate drives the tension spring to be compressed downward and pushes the side rod connecting plate to move downward. The downward movement of the side rod connecting plate slides along the connection part of the turning arc arm, so that the two side turning arc arms rotate around the rotating shaft fixing seat after being stressed. The turned turning arc arms slide on the table plate and push the connected positioning clamping plates close to the side surface of the battery pack. While correcting the placement position by the positioning clamping plates close to the side surface of the battery pack, it can play a positioning role for the battery pack on the table plate, preventing the battery pack from being displaced from its original position due to the vibration interference of the mechanical structure and affecting the welding position accuracy. In addition, when the positioning clamping plates are attached to the battery pack, the hydraulic rod continues to extend, causing the lower push plate to continue to drive the vertical support rods to move downward, so that the lower push plate drives the buffer plate to further compress the tension spring through the thin connecting rods and move downward.

[0009] According to the above technical solution, the busbar positioning mechanism includes four turning and folding rods. At the top of each turning and folding rod, a push-pull rod is fixedly connected. The end of the push-pull rod away from the turning and folding rod is slidably connected to a vertical groove folding rod. On the top surface of the vertical groove folding rod, a displacement block is fixedly connected. Inside the displacement block, a downward pressure frame is slidably connected. On both the upper and lower sides of the downward pressure frame, convex strips are fixedly connected. On the side surface of the displacement block, a banding rod is fixedly connected. Outside the displacement block, an insulating tape is provided.

[0010] According to the above technical solution, the turning and folding rod is fixedly connected to the turning arc arm. The convex strip is slidably connected to the downward pressure frame. The downward pressure frame is slidably connected to the lifting frame. The insulating tape is located between the displacement blocks at the front and rear ends. By the turning of the turning arc arm around the rotating shaft seat, the connected turning and folding rods are driven to move together. The moving turning and folding rod pushes the vertical groove folding rod through the connected push-pull rod, so that the vertical groove folding rod drives the connected displacement block to slide along the convex strip on the downward pressure frame after being stressed. By the sliding of the displacement block, the position of the insulating tape connected to the banding rod is adjusted. While the displacement block moves, the downward pressure frame connected to the lifting frame moves downward and approaches the busbar on the battery pack. Subsequently, the downward pressure frame moves upward by contacting the busbar on the battery pack with the insulating tape, so that part of the downward pressure frame slides and contracts into the lifting frame. As the lifting frame continues to move downward, the downward pressure frame drives the insulating tape connected to the displacement block to exert pressure on the busbar through elastic deformation, so that the busbar tightly fits the upper electrode of the battery pack.

[0011] According to the above technical solution, the protection and ventilation mechanism includes eight connecting shaft seats. Between two of the connecting shaft seats, a roller shaft is rotatably connected. Outside four of the roller shafts, a heat-resistant film is provided. On the bottom surface of the electric drive frame, two film support rods are fixedly connected. Between the two film support rods, a blocking strip is provided. On the side wall of the side cover plate, a ventilation square pipe is fixedly connected.

[0012] According to the above technical solution, heat dissipation fans are installed at both the front and rear ends of the ventilation square pipe. On the side surface of the ventilation square pipe, a sealing strip is fixedly connected. Inside the sealing strip, a communicating slideway is slidably connected. On both the front and rear sides of the electric drive frame, cavity plates are fixedly connected.

[0013] According to the above technical solution, both the front and rear sides of the upper support frame and the lifting frame are fixedly connected to two coupling seats. The film supporting rod is fixedly connected to the heat-resistant film, and the baffle is fixedly connected to the heat-resistant film. A welding groove is formed inside the baffle. The communication slideway is slidably connected to the ventilation square pipe, and the cavity plate is communicated with the communication slideway. When the electric drive frame slides along the slide rail to adjust its position, the connected film supporting rod is driven to move together by the movement of the electric drive frame. The movement of the film supporting rod drives the connected heat-resistant film to move and move around four rollers, so that the welding groove inside the baffle is always below the laser head. The baffle blocks the sparks generated by the laser head welding the mother row line around the heat-resistant film connected to the baffle. At the same time, the movement of the electric drive frame drives the connected cavity plate to move, so that the cavity plate drives the connected communication slideway to slide along the side of the ventilation square pipe. When the communication slideway slides, it will push the sealing strip on the side of the ventilation square pipe, so that the gap of the sealing strip opens when the communication slideway passes by. When the cooling fan on the side cover starts to work, the cooling fan sucks the air around the baffle into the communication slideway through the cavity plate, then transports it into the ventilation square pipe through the communication slideway, and then discharges it by the cooling fan, and discharges the air around the baffle through the cavity plate.

[0014] The present invention provides a laser welding device for battery module mother rows, which has the following beneficial effects:

[0015] In the present invention, by providing a lower push plate, a vertical support rod, a lifting frame, a thin connecting rod, a buffer plate, a rotating shaft fixing seat, a flipping arc arm, a positioning clamping plate, a slide rail, an electric drive frame, a mobile end, a screw rod, a laser head, and a side rod connecting plate, while correcting the placement position of the battery pack by the positioning clamping plate close to the side of the battery pack, it can play a positioning role for the battery pack on the table board, preventing the battery pack from being displaced from its original position due to mechanical structure vibration interference, which affects the welding position accuracy. In addition, at the same time, the lower push plate drives the buffer plate to squeeze the elastic spring to continue to move down through the thin connecting rod, so as to control the laser head to continue to move down close to the mother row line to achieve welding while playing a positioning role for the battery pack, improving the welding processing efficiency;

[0016] In the present invention, by providing a flipping folding rod, a push-pull rod, a vertical groove folding rod, a displacement block, a pressing frame, a convex strip, a banding rod, and an insulating tape, the mother row line is tightly attached to the upper electrode of the battery pack, avoiding the deformation and warping of the metal mother row line, which affects the welding quality of the battery pack, and avoiding short circuits or virtual soldering caused by loose welding. At the same time, using the elastic insulating tape to bind the mother row line can better fit the overall shape of the mother row line, thereby increasing the friction force, avoiding imprint marks or scratches on the metal material of the mother row line caused by mechanical structure positioning, and playing a better protective role for the mother row line;

[0017] In the present invention, by providing a coupling seat, a roller shaft, a heat-resistant film, a film support rod, a retaining strip, a ventilation square pipe, a cooling fan, a sealing strip, a communication slideway, and a cavity plate, it is possible to prevent sparks from being generated and oxidizing the metal surface of the welding area of the busbar or the battery pack, thereby increasing the internal resistance of the battery pack. It can also avoid dust or sparks from directly falling on the busbar. At the same time, by exhausting the air around the retaining strip through the cavity plate, it is possible to reduce the excessive concentration of heat during laser welding of the busbar, and avoid potential safety hazards caused by the increase in the temperature of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front three-dimensional structural schematic diagram of the whole of the present invention;

[0019] Figure 2 is a bottom three-dimensional structural schematic diagram of the whole of the present invention;

[0020] Figure 3 is a structural schematic diagram of the overall mechanism position distribution of the present invention;

[0021] Figure 4 is a structural schematic diagram of the overall laser welding mechanism of the present invention;

[0022] Figure 5 is a structural schematic diagram of the overall busbar positioning mechanism of the present invention;

[0023] Figure 6 is the whole of the present invention Figure 5 a magnified structural schematic diagram of A therein;

[0024] Figure 7 is a structural schematic diagram of the overall protection and ventilation mechanism of the present invention;

[0025] Figure 8 is the whole of the present invention Figure 7 a magnified structural schematic diagram of B therein;

[0026] Figure 9 is a structural schematic diagram of the overall cavity plate connection structure of the present invention.

[0027] In the figure: 1. platen; 2. side guard plate; 3. bottom plate; 4. battery pack; 5. laser welding mechanism; 51. lower push plate; 52. vertical support rod; 53. lifting frame; 54. thin connecting rod; 55. buffer plate; 56. rotating shaft fixing seat; 57. flipping arc arm; 58. positioning clamping plate; 59. slide rail; 510. electric drive frame; 511. mobile end; 512. screw rod; 513. laser head; 514. side rod connecting plate; 6. busbar positioning mechanism; 61. flipping folding rod; 62. push-pull rod; 63. vertical groove folding rod; 64. displacement block; 65. lower pressing frame; 66. convex strip; 67. belt rod; 68. insulating tape; 7. protection and ventilation mechanism; 71. coupling seat; 72. roller shaft; 73. heat-resistant film; 74. film support rod; 75. stop bar; 76. ventilation square pipe; 77. cooling fan; 78. sealing strip; 79. connecting slideway; 710. cavity plate; 8. side cover plate; 9. hydraulic rod; 10. upper support frame. Detailed implementation manner

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] Please refer to Figures 1-9 , an embodiment of the present invention is: a laser welding device for battery module busbars, including a platen 1, side guard plates 2 are fixedly connected to both sides of the platen 1, a bottom plate 3 is fixedly connected to the bottom ends of the side guard plates 2, a battery pack 4 is arranged above the platen 1, a laser welding mechanism 5 is arranged below the platen 1, a busbar positioning mechanism 6 is arranged above the battery pack 4, a protection and ventilation mechanism 7 is arranged above the busbar positioning mechanism 6, a hydraulic rod 9 is fixedly connected to the bottom surface of the platen 1, and side cover plates 8 are arranged on both sides of the protection and ventilation mechanism 7;

[0030] The laser welding mechanism 5 includes a lower push plate 51. On both sides of the top surface of the lower push plate 51, four vertical support rods 52 are fixedly connected. The tops of the four vertical support rods 52 are fixedly connected to a lifting frame 53. In the middle of the top surface of the lower push plate 51, four thin connecting rods 54 are fixedly connected. The tops of the four thin connecting rods 54 are fixedly connected to a buffer plate 55. A side rod connecting plate 514 is arranged between the buffer plate 55 and the lower push plate 51. On the front and back sides of the side rod connecting plate 514, a flipping arc arm 57 is slidably connected. At the middle position between two of the flipping arc arms 57, a rotating shaft fixing seat 56 is rotatably connected. At the top end of each flipping arc arm 57, a positioning clamping plate 58 is hingedly connected. On the top surface of the lifting frame 53, a slide rail 59 is fixedly connected. Above the slide rail 59, an electric drive frame 510 is slidably connected. Inside the electric drive frame 510, a mobile end 511 is slidably connected. At the bottom end of the mobile end 511, a laser head 513 is fixedly connected. Inside the side of the mobile end 511, a screw rod 512 is rotatably connected. Inside the side cover plate 8, an upper support frame 10 is fixedly connected. The side rod connecting plate 514 is slidably connected to the thin connecting rod 54. The vertical support rod 52 slides upward through the top surface from the bottom surface of the table plate 1. On the outside of the thin connecting rod 54, a elastic spring is arranged, and the two ends of the elastic spring are respectively fixedly connected to the buffer plate 55 and the lower push plate 51. The screw rod 512 is rotatably connected to the electric drive frame 510. The rotating shaft fixing seat 56 is fixedly connected to the table plate 1. The flipping arc arm 57 is slidably connected to the table plate 1. By the hydraulic rod 9 being in the extended state, the connected lower push plate 51 is pushed downward. The movement of the lower push plate 51 drives the connected vertical support rods 52 and the lifting frame 53 to move downward together, so that the electric drive frame 510 on the lifting frame 53 slides along the slide rail 59 through the built-in motor wheel and adjusts the position, and the built-in motor of the electric drive frame 510 drives the connected screw rod 512 to adjust the position of the mobile end 511 on the electric drive frame 510. When the mobile end 511 drives the laser head 513 to adjust the position, it cooperates with the downward movement of the lifting frame 53 to approach the integrated bus bar arranged on the battery pack 4. The high temperature generated by the laser head 513 welds the bus bar and the electrode contact piece on the battery pack 4. At the same time, by the downward movement of the lower push plate 51, the connected thin connecting rod 54 is driven to pull the buffer plate 55, so that the buffer plate 55 drives the elastic spring to be compressed downward and pushes the side rod connecting plate 514 to move downward. By the downward movement of the side rod connecting plate 514, it slides along the connection part of the flipping arc arm 57, so that the two side flipping arc arms 57 are stressed and rotate around the rotating shaft fixing seat 56. The flipped flipping arc arm 57 slides on the table plate 1 and pushes the connected positioning clamping plate 58 to approach the side of the battery pack 4. While correcting the placement position by the positioning clamping plate 58 approaching the side of the battery pack 4, it can play a positioning role for the battery pack 4 on the table plate 1, preventing the battery pack 4 from being offset from its original position due to the vibration interference of the mechanical structure and affecting the welding position accuracy. In addition, when the positioning clamping plate 58 fits the battery pack 4, the hydraulic rod 9 continues to extend, causing the lower push plate 51 to continue to drive the vertical support rod 52 to move downward, so that the lower push plate 51 drives the buffer plate 55 to continue to move downward by squeezing the elastic spring through the thin connecting rod 54.Thus, while positioning the battery pack 4, the laser head 513 is controlled to continue moving downwards to approach the mother bus bar for welding, improving the welding processing efficiency.

[0031] The mother bus bar positioning mechanism 6 includes four turning folding rods 61. At the top of each turning folding rod 61, a push-pull rod 62 is fixedly connected. At the end of the push-pull rod 62 far from the turning folding rod 61, a vertical groove folding rod 63 is slidably connected. On the top surface of the vertical groove folding rod 63, a displacement block 64 is fixedly connected. Inside the displacement block 64, a downward pressure frame 65 is slidably connected. On both the upper and lower sides of the downward pressure frame 65, a convex strip 66 is fixedly connected. On the side surface of the displacement block 64, a banding rod 67 is fixedly connected. Outside the displacement block 64, an insulating tape 68 is arranged. The turning folding rod 61 is fixedly connected to the turning arc arm 57. The convex strip 66 is slidably connected to the downward pressure frame 65. The downward pressure frame 65 is slidably connected to the lifting frame 53. The insulating tape 68 is located between the displacement blocks 64 at the front and rear ends. By the turning of the turning arc arm 57 around the rotating shaft base 56, the connected turning folding rod 61 is driven to move together. The moving turning folding rod 61 pushes the vertical groove folding rod 63 through the connected push-pull rod 62. After the vertical groove folding rod 63 is stressed, it drives the connected displacement block 64 to slide along the convex strip 66 on the downward pressure frame 65. By the sliding of the displacement block 64, the position of the insulating tape 68 connected to the banding rod 67 is adjusted. While the displacement block 64 moves, the downward pressure frame 65 connected to the lifting frame 53 moves downwards closer to the mother bus bar on the battery pack 4. Subsequently, by the contact of the insulating tape 68 with the mother bus bar on the battery pack 4, the downward pressure frame 65 moves upwards, causing part of the downward pressure frame 65 to slide and contract into the lifting frame 53. As the lifting frame 53 continues to move downwards, the downward pressure frame 65 drives the insulating tape 68 connected to the displacement block 64 to apply pressure to the mother bus bar through elastic deformation, making the mother bus bar closely fit the upper electrode of the battery pack 4, preventing the mother bus bar made of metal material from deforming and warping, which affects the welding quality of the battery pack 4, and avoiding short circuits or virtual soldering caused by loose welding. At the same time, using the elastic insulating tape 68 to bind the mother bus bar can better fit the overall shape of the mother bus bar, thereby increasing the friction force, avoiding imprint marks or scratches on the metal material of the mother bus bar caused by mechanical structure positioning, and playing a better protective role for the mother bus bar.

[0032] The protective ventilation mechanism 7 includes eight shaft coupling seats 71. A roller shaft 72 is rotatably connected between two shaft coupling seats 71. Heat-resistant films 73 are arranged on the outer sides of four roller shafts 72. Two film support rods 74 are fixedly connected to the bottom surface of the electric drive frame 510. A retaining strip 75 is arranged between the two film support rods 74. A ventilation square pipe 76 is fixedly connected to the side wall of the side cover plate 8. Heat dissipation fans 77 are installed at both the front and rear ends of the ventilation square pipe 76. A sealing strip 78 is fixedly connected to the side surface of the ventilation square pipe 76. A communicating slideway 79 is slidably connected inside the sealing strip 78. Cavity plates 710 are fixedly connected to both the front and rear sides of the electric drive frame 510. Both the front and rear sides of the upper support frame 10 and the lifting frame 53 are fixedly connected to the two shaft coupling seats 71. The film support rods 74 are fixedly connected to the heat-resistant films 73. The retaining strip 75 is fixedly connected to the heat-resistant films 73. And a welding groove is formed inside the retaining strip 75. The communicating slideway 79 is slidably connected to the ventilation square pipe 76. The cavity plates 710 communicate with the communicating slideway 79. The movement of the electric drive frame 510 drives the connected film support rods 74 to move together. The movement of the film support rods 74 drives the connected heat-resistant films 73 to move and move around the four roller shafts 72, so that the welding groove inside the retaining strip 75 is always located below the laser head 513. And the sparks generated by the laser head 513 welding the mother busbar are blocked around the heat-resistant film 73 connected to the retaining strip 75, preventing the sparks from oxidizing the metal surface in the welding area of the mother busbar or the battery pack 4, increasing the internal resistance of the battery pack 4, and avoiding dust or sparks from directly falling on the mother busbar. At the same time, the movement of the electric drive frame 510 drives the connected cavity plates 710 to move simultaneously, so that the cavity plates 710 drive the connected communicating slideway 79 to slide along the side surface of the ventilation square pipe 76. When the communicating slideway 79 slides, it will push the sealing strip 78 on the side surface of the ventilation square pipe 76, causing the gap of the sealing strip 78 to open when the communicating slideway 79 passes. When the heat dissipation fans 77 on the side cover plate 8 start to work, the heat dissipation fans 77 suck the air around the retaining strip 75 into the communicating slideway 79 through the cavity plates 710, then transport it to the ventilation square pipe 76 through the communicating slideway 79, and then discharge it by the heat dissipation fans 77. The discharge of the air around the retaining strip 75 through the cavity plates 710 can reduce the excessive concentration of heat during laser welding of the busbar, and avoid potential safety hazards caused by the increase in the temperature of the battery pack 4.

[0033] Working principle: During welding, the battery pack 4 needs to be moved to a specified position on the platen 1. When the hydraulic rod 9 is in the extended state, it pushes the connected lower push plate 51 downward. The movement of the lower push plate 51 drives the connected vertical support rod 52 and the lifting frame 53 downward together, causing the electric drive frame 510 on the lifting frame 53 to slide along the slide rail 59 through the built-in motor wheel and adjust its position. The built-in motor of the electric drive frame 510 drives the connected screw rod 512 to adjust the position of the mobile end 511 on the electric drive frame 510. When the mobile end 511 drives the laser head 513 to adjust to the correct position, it cooperates with the downward movement of the lifting frame 53 to approach the integrated bus bar arranged on the battery pack 4. The high temperature generated by the laser head 513 is used to weld the bus bar to the electrode contact piece on the battery pack 4. At the same time, the downward movement of the lower push plate 51 drives the connected thin connecting rod 54 to pull the buffer plate 55, causing the buffer plate 55 to drive the elastic spring to be compressed downward and push the side rod connecting plate 514 downward. The downward movement of the side rod connecting plate 514 slides along the connection of the flipping arc arm 57, causing the two flipping arc arms 57 to rotate around the rotating shaft seat 56 under force. The flipped flipping arc arms 57 slide on the platen 1 and push the connected positioning clamping plate 58 closer to the side of the battery pack 4. While correcting the placement position of the battery pack 4 by approaching the side of the battery pack 4 with the positioning clamping plate 58, it can play a positioning role for the battery pack 4 on the platen 1, preventing the battery pack 4 from being displaced from its original position due to mechanical structure vibration interference, which affects the welding position accuracy. In addition, when the positioning clamping plate 58 fits the battery pack 4, the hydraulic rod 9 continues to extend, causing the lower push plate 51 to continue driving the vertical support rod 52 downward, and the lower push plate 51 drives the buffer plate 55 to further compress the elastic spring downward through the thin connecting rod 54, thereby playing a positioning role for the battery pack 4 while controlling the laser head 513 to continue moving downward to approach the bus bar for welding, improving the welding processing efficiency;

[0034] By flipping the arc arm 57 to rotate around the rotating shaft base 56, the connected folding lever 61 is driven to move together. The moving folding lever 61 pushes the vertical groove folding lever 63 through the connected push-pull rod 62, so that the vertical groove folding lever 63 drives the connected displacement block 64 to slide along the protrusion 66 on the lower pressing frame 65 after being stressed. By sliding the displacement block 64, the position of the insulating tape 68 connected to the strap rod 67 is adjusted. While the displacement block 64 moves, the lower pressing frame 65 connected to the lifting frame 53 moves downward close to the bus bar on the battery pack 4. Subsequently, the lower pressing frame 65 moves upward by contacting the bus bar on the battery pack 4 through the insulating tape 68, so that part of the lower pressing frame 65 slides and contracts into the interior of the lifting frame 53. As the lifting frame 53 continues to move downward, the lower pressing frame 65 drives the insulating tape 68 connected to the displacement block 64 to apply pressure to the bus bar through elastic deformation, so that the bus bar tightly fits the upper electrode of the battery pack 4, avoiding the deformation and warping of the bus bar made of metal material, which affects the welding quality of the battery pack 4 and avoiding short circuit or virtual soldering caused by loose welding. At the same time, using the elastic insulating tape 68 to bind the bus bar can better fit the overall shape of the bus bar, thereby increasing the friction force, avoiding the imprint or scratch on the metal material of the bus bar caused by mechanical structure positioning, and playing a better protective role for the bus bar;

[0035] When the electric drive frame 510 slides along the slide rail 59 to adjust the position, the connected film support rod 74 is driven to move together by the movement of the electric drive frame 510. The movement of the film support rod 74 drives the connected heat-resistant film 73 to move and move around the four rollers 72, so that the welding groove inside the stop bar 75 is always under the laser head 513, and the sparks generated by the laser head 513 welding the bus bar are blocked around the heat-resistant film 73 connected to the stop bar 75, preventing the sparks from oxidizing the metal surface of the welding area of the bus bar or the battery pack 4, increasing the internal resistance of the battery pack 4, and avoiding dust or sparks from directly falling on the bus bar. At the same time, by using the movement of the electric drive frame 510 to drive the connected cavity plate 710 to move at the same time, the cavity plate 710 drives the connected communication slideway 79 to slide along the side of the ventilation square pipe 76. When the communication slideway 79 slides, it will push the sealing strip 78 on the side of the ventilation square pipe 76, so that the gap of the sealing strip 78 opens when the communication slideway 79 passes by. When the cooling fan 77 on the side cover 8 starts to work, the cooling fan 77 sucks the air around the stop bar 75 into the communication slideway 79 through the cavity plate 710, then transports it to the ventilation square pipe 76 through the communication slideway 79, and then discharges it by the cooling fan 77. By discharging the air around the stop bar 75 through the cavity plate 710, the excessive concentration of heat during laser welding of the wire can be reduced, and the potential safety hazard caused by the increase in the temperature of the battery pack 4 can be avoided.

[0036] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A laser welding device for the busbar of a battery module, comprising a platen (1), characterized in that: On both sides of the platen (1), side guard plates (2) are fixedly connected. At the bottom end of the side guard plates (2), a bottom plate (3) is fixedly connected. Above the platen (1), a battery pack (4) is arranged. Below the platen (1), a laser welding mechanism (5) is arranged. Above the battery pack (4), a busbar positioning mechanism (6) is arranged. Above the busbar positioning mechanism (6), a protective ventilation mechanism (7) is arranged. At the bottom surface of the platen (1), a hydraulic rod (9) is fixedly connected. On both sides of the protective ventilation mechanism (7), side cover plates (8) are arranged; The laser welding mechanism (5) includes a lower push plate (51). On both sides of the top surface of the lower push plate (51), four vertical support rods (52) are fixedly connected. At the top ends of the four vertical support rods (52), a lifting frame (53) is fixedly connected. In the middle of the top surface of the lower push plate (51), four thin connecting rods (54) are fixedly connected. At the top ends of the four thin connecting rods (54), a buffer plate (55) is fixedly connected. Between the buffer plate (55) and the lower push plate (51), a side rod connecting plate (514) is arranged. On the front and rear sides of the side rod connecting plate (514), turning arc arms (57) are slidably connected. At the middle positions of two of the turning arc arms (57), a rotating shaft fixing seat (56) is rotatably connected. At the top end of each turning arc arm (57), a positioning clamping plate (58) is hingedly connected. On the top surface of the lifting frame (53), a slide rail (59) is fixedly connected. Above the slide rail (59), an electric drive frame (510) is slidably connected. Inside the electric drive frame (510), a mobile end (511) is slidably connected. Inside the side surface of the mobile end (511), a screw rod (512) is rotatably connected; The side rod connecting plate (514) is slidably connected with the thin connecting rod (54). The vertical support rod (52) slides upward through the top surface from the bottom surface of the platen (1). On the outer side of the thin connecting rod (54), a elastic spring is arranged, and the two ends of the elastic spring are respectively fixedly connected with the buffer plate (55) and the side rod connecting plate (514). The screw rod (512) is rotatably connected with the electric drive frame (510). The rotating shaft fixing seat (56) is fixedly connected with the platen (1). The turning arc arm (57) is slidably connected with the platen (1); The busbar positioning mechanism (6) includes four turning folding rods (61). At the top end of each turning folding rod (61), a push-pull rod (62) is fixedly connected. At the end of the push-pull rod (62) far from the turning folding rod (61), a vertical groove folding rod (63) is slidably connected. On the top surface of the vertical groove folding rod (63), a displacement block (64) is fixedly connected. Inside the displacement block (64), a downward pressing frame (65) is slidably connected. On the upper and lower sides of the downward pressing frame (65), convex strips (66) are fixedly connected. On the side surface of the displacement block (64), a banding rod (67) is fixedly connected. Outside the displacement block (64), an insulating tape (68) is arranged.

2. The laser welding device for the battery module busbar according to claim 1, characterized in that: At the bottom end of the mobile end (511), a laser head (513) is fixedly connected. Inside the side cover plate (8), an upper support frame (10) is fixedly connected.

3. The laser welding device for the battery module busbar according to claim 2, wherein: The flipping turning rod (61) is fixedly connected to the flipping arc arm (57), the displacement block (64) is slidably connected to the downward pressing frame (65), the downward pressing frame (65) is slidably connected to the lifting frame (53), and the insulating tape (68) is located between the displacement blocks (64) at the front and rear ends.

4. A laser welding device for the busbar of a battery module according to claim 3, characterized in that: The protective ventilation mechanism (7) includes eight shaft connecting seats (71), a roller shaft (72) is rotatably connected between two of the shaft connecting seats (71), a heat-resistant film (73) is arranged on the outer sides of four of the roller shafts (72), two film supporting rods (74) are fixedly connected to the bottom surface of the electric drive frame (510), a blocking strip (75) is arranged between the two film supporting rods (74), and a ventilation square pipe (76) is fixedly connected to the side wall of the side cover plate (8).

5. The laser welding device for the battery module busbar according to claim 4, characterized in that: Heat dissipation fans (77) are installed at both the front and rear ends of the ventilation square pipe (76), a sealing strip (78) is fixedly connected to the side surface of the ventilation square pipe (76), a communicating slideway (79) is slidably connected to the inner side of the sealing strip (78), and cavity plates (710) are fixedly connected to both the front and rear sides of the electric drive frame (510).

6. The laser welding device for the battery module busbar according to claim 5, wherein: Both the front and rear sides of the upper support frame (10) and the lifting frame (53) are fixedly connected to two shaft connecting seats (71), the film supporting rod (74) is fixedly connected to the heat-resistant film (73), the blocking strip (75) is fixedly connected to the heat-resistant film (73), and a welding groove is formed in the inner side of the blocking strip (75), the communicating slideway (79) is slidably connected to the ventilation square pipe (76), and the cavity plate (710) is communicated with the communicating slideway (79).

Images