A kind of sodium-ion battery production uses the ultrasonic welding equipment of cell tab

Abstract

This invention relates to the field of battery cell tab welding equipment technology. The invention provides an ultrasonic welding equipment for sodium-ion battery cell tabs, comprising an outer casing containing a processing table. Multiple mounting plates are symmetrically arranged on the processing table, each mounting plate having a transverse module and a lifting module. An ultrasonic welding unit is mounted on the lifting module, and a flattening mechanism is mounted on the ultrasonic welding unit. A clamping platform for placing the battery cell is mounted on the transverse module. After welding is completed, the ultrasonic welding unit moves upward and resets with the lifting module. The flattening wheel in the flattening mechanism rolls along the welding area under the elastic potential energy released by the L-shaped elastic sheet, performing a flattening and straightening operation on the welding area. This corrects warping caused by thermal effects or localized stress during welding, improving the flatness and fit of the welded tabs, thereby ensuring subsequent assembly quality and electrical performance stability.

Description

Technical Field

[0001] This invention belongs to the technical field of battery cell tab welding equipment, specifically relating to an ultrasonic welding equipment for battery cell tabs used in sodium-ion battery production. Background Technology

[0002] Sodium-ion batteries are a new type of rechargeable battery that uses sodium ions to be inserted and extracted between the positive and negative electrodes to achieve charging and discharging. They have the advantages of abundant raw material reserves, low cost and good safety. In recent years, they have shown good application prospects in energy storage, power tools and low-speed electric vehicles. In the production process of sodium-ion batteries, the cell tabs need to be reliably connected to the connecting pieces or busbar components. Ultrasonic welding has been widely used in the welding process of cell tabs because of its high welding efficiency, small heat-affected zone and good connection strength.

[0003] The existing method generally uses clamps to fix the battery cell and then uses an ultrasonic welding head to press-weld the tabs. However, after welding, the tabs are prone to warping and deformation due to local heat effects or stress concentration, which affects the subsequent assembly quality. Moreover, the cooling and shrinkage after welding may also cause large tensile stress at the tab connection, which may lead to the tabs cracking, breaking, or a decrease in the reliability of the welded connection in severe cases. Therefore, it is necessary to design an ultrasonic welding equipment for battery cell tabs for sodium-ion battery production. Summary of the Invention

[0004] The purpose of this invention is to provide an ultrasonic welding device for cell tabs in sodium-ion battery production that has a simple structure and a reasonable design in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: An ultrasonic welding device for battery cell tabs in sodium-ion battery production includes an outer casing. A processing table is housed inside the outer casing. Multiple mounting plates are symmetrically arranged on the processing table. Each mounting plate has a horizontal movement module and a lifting module. An ultrasonic welding unit is mounted on the lifting module, and a flattening mechanism is mounted on the ultrasonic welding unit. A clamping platform for placing battery cells is mounted on the horizontal movement module, and a shrinkage compensation mechanism and a fume capture mechanism are mounted on the clamping platform. A clamping cylinder is fixed to the bottom of the clamping platform, and a downward pressure mechanism is fixedly connected to the output end of the clamping cylinder. The frame includes a sliding rod fixed on the lower pressure frame, with a lower pressure shell slidably connected to both ends of the sliding rod. The shrinkage compensation mechanism includes a push frame fixed on the lifting module and a friction rod fixed on the lower pressure frame. A friction block is slidably connected to the friction rod, and the friction block is fixed on the lower pressure shell. The contact surface between the friction block and the friction rod is a frosted surface. A return spring is provided between the friction block and the lower pressure frame, and the return spring is sleeved on the friction rod. A side support is fixed on one side of the friction block, and an inclined surface is provided at the bottom of the side support. A wedge-shaped surface is provided on the push frame to abut against the inclined surface.

[0006] As a further optimization of the present invention, the flue gas capture mechanism includes a capture shell symmetrically fixed on the clamping platform, an adsorption cotton layer fixed on one side of the capture shell, a connecting shaft rotatably connected inside the capture shell, and an exhaust fan fixedly sleeved on one end of the connecting shaft.

[0007] As a further optimization of the present invention, an outer ring body is rotatably connected to the connecting shaft. The outer ring body is provided with a plurality of elastic abutment pieces arranged in a circular pattern. One end of each elastic abutment piece abuts against a groove opened on the connecting shaft. The outer ring body is provided with a plurality of support blocks that restrict the deformation state of the elastic abutment pieces. The outer ring body is connected to a transmission rack through the meshing of teeth on its outer wall. A support shaft is provided at the bottom of the transmission rack. The support shaft is slidably connected in the outer sleeve, and a support spring located inside the outer sleeve is fixed at the bottom end of the support shaft.

[0008] As a further optimization of the present invention, the flattening mechanism includes a connecting plate, with L-shaped elastic sheets symmetrically arranged at the bottom of the connecting plate, a side support rod rotatably connected to the bottom of the connecting plate, a flattening wheel rotatably connected to the side support rod, and a reset rod slidably connected in the elongated slot in the middle of the side support rod, the reset rod being fixed on the L-shaped elastic sheet.

[0009] As a further optimization of the present invention, a support roller is uniformly rotatably connected to the clamping platform, and guide columns that are symmetrically connected to the lower pressure frame are arranged on the top of the clamping platform. A welding lower mold for supporting the electrode tab is arranged at the center of the top of the clamping platform. The welding lower mold is located between two lower pressure shells. A lower pressure pad is slidably connected to the bottom of the lower pressure shell. The lower pressure shell and the lower pressure pad are connected by a spring. An anti-slip plate is arranged at the bottom of the lower pressure pad, and an electrode tab pressing plate to prevent electrode tab misalignment is arranged on one side of the lower pressure pad.

[0010] As a further optimization of the present invention, the transverse module includes a transverse housing fixed on a mounting plate, a transverse motor fixed on the transverse housing, a transverse lead screw fixedly connected to the output end of the transverse motor, and the transverse lead screw rotatably connected to the transverse housing.

[0011] As a further optimization of the present invention, a transverse frame that is slidably connected to the transverse shell and cooperates with the transverse screw is provided, the clamping platform is fixed on the transverse frame, and the bottom end of the outer sleeve is fixed on the transverse frame.

[0012] As a further optimization of the present invention, the lifting module includes a lifting shell fixed on the mounting plate, a lifting motor fixed on the top of the lifting shell, a lifting screw fixedly connected to the output end of the lifting motor, the lifting screw being rotatably connected to the lifting shell, and a lifting frame slidably connected to the lifting shell in cooperation with the lifting screw.

[0013] As a further optimization of the present invention, a mounting frame is fixed on one side of the lifting frame, and the pushing frame is fixed at the bottom of the mounting frame.

[0014] As a further optimization of the present invention, the ultrasonic welding unit includes an outer shell fixed on a mounting frame, a connecting flange at the bottom of the outer shell, an amplitude transformer fixed at the bottom of the connecting flange, an ultrasonic generator connected to the amplitude transformer inside the outer shell, an ultrasonic welding head fixed at the bottom of the amplitude transformer, and a connecting plate fixed on the connecting flange.

[0015] The beneficial effects of this invention are as follows: 1. Before welding begins, the clamping cylinder drives the lower pressure frame to move downward. While the lower pressure pad presses the battery cell, the electrode pressure plate provides additional restraint to the area adjacent to the electrode, making it less likely for the electrode to shift, warp, or misalign during the ultrasonic welding head pressing down and welding process. This ensures accurate welding position and stable weld formation. After welding is completed, the ultrasonic welding unit moves upward and resets with the lifting module. The flattening wheel in the flattening mechanism rolls along the welding area under the action of the elastic potential energy released by the L-shaped elastic sheet, performing a flattening and pressing operation on the welding area. This corrects warping caused by thermal effects or localized stress during welding, improving the flatness and fit of the electrode after welding, which in turn helps to ensure subsequent assembly quality and electrical performance stability.

[0016] 2. During the ultrasonic welding unit's downward welding process, the outer shell presses down on the transmission rack, compressing the support spring and accumulating elastic potential energy. However, since the elastic abutment plate does not form a stable transmission to the connecting shaft at this time, the outer ring body will not drive the connecting shaft and the exhaust fan to rotate when it rotates. After welding is completed, the ultrasonic welding unit moves upward and resets, the support spring releases its elastic potential energy and pushes the transmission rack to move in the opposite direction. The transmission rack drives the outer ring body to rotate, and the outer ring body forms an effective transmission with the connecting shaft through the elastic abutment plate, thereby driving the exhaust fan to rotate and forming a unidirectional airflow from the welding area toward the capture shell. This airflow can, on the one hand, play a certain auxiliary role in heat dissipation and cooling of the welded area, and on the other hand, it can attract and guide the fumes generated during the welding process to the adsorption cotton layer in a timely manner, realizing the capture of fumes and avoiding the fumes from lingering or falling back to contaminate the electrode surface, thereby improving the cleanliness of the welding area and the quality of the finished product.

[0017] 3. After welding is completed, the ultrasonic welding unit is reset upward with the lifting module. When the mounting frame moves to the set limit position, the push frame pushes the inclined surface of the bottom support through the wedge-shaped surface, thereby pushing the friction block and the lower pressure shell to move slightly towards the center. This causes the clamped battery cell to move slightly towards the center in sync, in order to compensate for the shrinkage caused by the local temperature rise and cooling contraction in the welding area. This can effectively reduce the tensile stress of the electrode tab after welding, prevent the electrode tab from breaking, cracking or stress concentration at the connection, thereby improving the durability of the welded connection and the overall welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the transverse movement module in this invention; Figure 3 This is a schematic diagram of the lifting module in this invention; Figure 4 This is a schematic diagram showing the location of the shrinkage compensation mechanism in this invention; Figure 5 This is an assembly diagram of the shrinkage compensation mechanism in this invention; Figure 6 This is a schematic diagram of the flue gas capture mechanism in this invention; Figure 7 This is an assembly diagram of the flattening mechanism in this invention; Figure 8 This is a schematic diagram of the flattening mechanism in this invention; Figure 9 yes Figure 8 A magnified view of a portion of region A in the middle.

[0019] In the diagram: 1. Outer casing; 2. Machining table; 3. Mounting plate; 4. Transverse module; 5. Lifting module; 6. Ultrasonic welding unit; 7. Flattening mechanism; 8. Shrinkage compensation mechanism; 9. Smoke capture mechanism; 10. Clamping table; 11. Clamping cylinder; 12. Lower pressure frame; 13. Sliding rod; 14. Lower pressure shell; 15. Support roller; 16. Guide column; 17. Welding lower mold; 18. Lower pressure pad; 19. Electrode pressure plate; 41. Transverse shell; 42. Transverse motor; 43. Transverse frame; 51. Lifting shell; 52. Lifting motor; 53. 54. Lifting frame; 65. Mounting frame; 66. Outer shell; 67. Amplitude bar; 68. Ultrasonic welding head; 79. Connecting plate; 70. L-shaped elastic sheet; 71. Side support rod; 72. Flattening wheel; 73. Reset rod; 84. Pushing frame; 85. Friction rod; 86. Friction block; 87. Reset spring; 98. Side support; 99. Support spring; 90. Capture shell; 91. Connecting shaft; 92. Exhaust fan; 93. Outer ring; 94. Elastic abutment piece; 95. Support block; 96. Transmission rack; 97. Support shaft; 98. Outer sleeve. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example: Please refer to Figures 1-9An ultrasonic welding device for battery cell tabs in sodium-ion battery production includes an outer casing 1, within which a processing table 2 is installed. Multiple mounting plates 3 are symmetrically arranged on the processing table 2. Each mounting plate 3 is equipped with a horizontal movement module 4 and a lifting module 5. An ultrasonic welding unit 6 is mounted on the lifting module 5. A clamping platform 10 for placing the battery cell is mounted on the horizontal movement module 4. The horizontal movement module 4 drives the clamping platform 10 to move horizontally, adjusting the relative position between the battery cell workpiece and the ultrasonic welding unit 6, thus precisely moving the battery cell tab to the welding position and improving welding positioning accuracy. The lifting module 5 drives the ultrasonic welding unit 6 to move vertically. When the lifting module 5 moves downward, it can drive the ultrasonic welding unit 6 to approach and press against the electrode tab for welding. When it moves upward, it can drive the ultrasonic welding unit 6 to leave the welding area and reset. The ultrasonic welding unit 6 is equipped with a flattening mechanism 7. Under the drive of the lifting module 5, the ultrasonic welding unit 6 can move up and down to perform electrode tab welding. After the welding operation, it is reset under the drive of the lifting module 5. During the reset process, the flattening mechanism 7 is used to flatten and shape the warping of the electrode tab after welding, so as to avoid the electrode tab from warping and deformation due to welding heat effect or local stress concentration, thereby improving the flatness and fit of the electrode tab after welding, and ensuring the stability of subsequent assembly and electrical performance.

[0022] Please see Figures 2-7The clamping table 10 is equipped with a shrinkage compensation mechanism 8 and a fume capture mechanism 9. After ultrasonic welding, as the ultrasonic welding unit 6 moves upward, the shrinkage compensation mechanism 8 pushes the battery cells on both sides to shift slightly towards the center. This compensates for the material shrinkage caused by local temperature rise and subsequent cooling shrinkage after welding, preventing the electrode tabs from being pulled apart, cracked, or experiencing stress concentration after welding due to excessive tensile stress. This effectively reduces abnormal stress on the electrode tabs after welding, improving the reliability and durability of the welded connection. At the same time, the fume capture mechanism 9 captures the fumes generated during welding, reducing the amount of fumes trapped in the clamping table. The fumes linger on the surface of the clamping platform 10 and near the electrode welding area, preventing them from falling and drifting onto the electrode surface, thus improving welding cleanliness and product quality. A clamping cylinder 11 is fixed to the bottom of the clamping platform 10. A lower pressure frame 12 is fixedly connected to the output end of the clamping cylinder 11. A sliding rod 13 is fixed to the lower pressure frame 12. Both ends of the sliding rod 13 are slidably connected to lower pressure shells 14. A lower pressure pad 18 is slidably connected to the bottom of the lower pressure shell 14. The lower pressure shell 14 and the lower pressure pad 18 are connected by a spring. An anti-slip plate is provided at the bottom of the lower pressure pad 18 to increase friction with the surface of the battery cell and prevent... During clamping, the battery cell slips, improving positioning reliability and preventing unstable clamping from affecting the electrode welding accuracy. A tab clamping plate 19 is provided on one side of the lower pressure pad 18 to prevent electrode misalignment. The tab clamping plate 19 is used to provide additional limiting and clamping to the area adjacent to the electrode during clamping, preventing the electrode from shifting, lifting, or misaligning before or after welding. A support roller 15 is uniformly rotatably connected to the clamping table 10. The support roller 15 can roll and support the battery cell placed at the bottom. During the shrinkage compensation mechanism 8 pushing the battery cell slightly towards the center, the battery cell is prevented from rubbing against the clamping table 10. The friction generated not only prevents the bottom surface of the battery cell from being scratched, but also improves the sensitivity and stability of the shrinkage compensation action, preventing inadequate compensation due to excessive friction. The top of the clamping platform 10 is symmetrically provided with guide posts 16, and the lower pressure frame 12 is slidably connected to the guide posts 16. The center of the top of the clamping platform 10 is provided with a welding lower mold 17 for supporting the electrode tab. The welding lower mold 17 is located between the two lower pressure shells 14. The welding lower mold 17 provides stable reverse support for the electrode tab welding area, preventing the electrode tab from being suspended and deformed or sinking under pressure, thereby improving the weld point forming quality and welding firmness.

[0023] During operation, the battery cell to be welded is first placed on top of the clamping platform 10. The bottom of the battery cell is supported by the support roller 15, which is uniformly rotated and connected to the clamping platform 10. The electrode area of ​​the battery cell is located above the welding lower mold 17. At this time, the welding lower mold 17 forms a bottom support for the electrode welding part, providing stable support for subsequent welding. The clamping cylinder 11 is activated, driving the lower pressure frame 12 to move downward along the guide column 16. When the lower pressure frame 12 moves downward, it drives the lower pressure shells 14 on both sides to press down synchronously through the sliding rod 13. The lower pressure pad 18 at the bottom of the lower pressure shell 14 contacts and presses the surface of the battery cell. At the same time, the electrode pressure plate 19 set on one side of the lower pressure pad 18 limits and presses the area adjacent to the electrode to prevent the electrode from shifting, lifting or misaligning before welding, so that the electrode is kept in the predetermined welding position. After the battery cell is clamped stably, the transverse module 4 is activated, driving the clamping platform 10 to move horizontally, so that the battery cell electrode gradually moves to the front of the ultrasonic welding unit 6. Below, precise positioning is completed before welding. After positioning, the lifting module 5 drives the ultrasonic welding unit 6 to move downward. The ultrasonic welding unit 6 gradually approaches the electrode tab and performs ultrasonic welding on the electrode tab after reaching the set position. After welding, the lifting module 5 drives the ultrasonic welding unit 6 to return to its original position. During the process, the fume capture mechanism 9 captures the fume generated during welding in a timely manner to reduce the stagnation of fume on the surface of the clamping table 10 and near the electrode tab welding area, and to prevent the fume from falling or drifting to the electrode tab surface, thereby improving the cleanliness of the welding area and the welding quality. The flattening mechanism 7 flattens and shapes the electrode tab after welding, thereby correcting the warping caused by thermal effects or local stress concentration during welding, and improving the flatness and fit of the electrode tab after welding. At the same time, the shrinkage compensation mechanism 8 pushes the two battery cells on both sides to move slightly towards the center to compensate for the material shrinkage caused by local temperature rise and subsequent cooling shrinkage after welding.

[0024] Please see Figures 2-5The transverse module 4 includes a transverse housing 41 fixed on the mounting plate 3, a transverse motor 42 fixed on the transverse housing 41, a transverse lead screw fixedly connected to the output end of the transverse motor 42, the transverse lead screw being rotatably connected to the transverse housing 41 via bearings, a transverse frame 43 slidably connected to the transverse housing 41, the transverse frame 43 being connected to the transverse lead screw via internally embedded ball nuts, and a clamping table 10 fixed on the transverse frame 43; the lifting module 5 includes a lifting housing 51 fixed on the mounting plate 3, a lifting motor 52 fixed to the top of the lifting housing 51, a lifting lead screw fixedly connected to the output end of the lifting motor 52, and the lifting lead screw being rotatably connected to the bearings. The lifting housing 51 has a lifting frame 53 slidably connected to it. The lifting frame 53 is connected to the lifting screw by ball nuts embedded inside. A mounting bracket 54 is fixed to one side of the lifting frame 53. The ultrasonic welding unit 6 includes an outer shell 61 fixed to the mounting bracket 54. A connecting flange is provided at the bottom of the outer shell 61. An amplitude transformer 62 is fixed at the bottom of the connecting flange. An ultrasonic generator connected to the amplitude transformer 62 is provided inside the outer shell 61. An ultrasonic welding head 63 is fixed at the bottom of the amplitude transformer 62 (the ultrasonic generator, amplitude transformer 62 and ultrasonic welding head 63 are all prior art and will not be described in detail here).

[0025] Please see Figures 6-8 The flattening mechanism 7 includes a connecting plate 71 fixed to the connecting flange. L-shaped elastic plates 72 are symmetrically arranged at the bottom of the connecting plate 71. A side support rod 73 is rotatably connected to the bottom of the connecting plate 71. Flattening wheels 74 are rotatably connected to the side support rod 73. A reset rod 75 is slidably connected to a long slot in the middle of the side support rod 73. The reset rod 75 is fixed to the L-shaped elastic plate 72. Under non-external force conditions, the L-shaped elastic plate 72 does not deform. At this time, supported by the reset rod 75 and the L-shaped elastic plate 72, the side support rod 73 keeps the flattening wheels 74 on both sides above the welding area. As the lifting frame 53 moves downward, the flattening wheels 74 first abut against the electrode lugs. The L-shaped elastic sheet 72 is placed on the welding connecting piece on the welding lower mold 17. As it continues to move downward, the L-shaped elastic sheet 72 gradually bends and deforms. The flattening wheel 74 rolls to both sides until the ultrasonic welding head 63 contacts the electrode tab and the welding connecting piece for welding. During the welding process, the flattening wheel 74 works with the electrode tab pressing plate 19 to limit the electrode tab and prevent the electrode tab from being misaligned during the pressing process. After the welding is completed, the lifting frame 53 moves upward under the drive of the lifting motor 52. During the process, the L-shaped elastic sheet 72 releases its elastic potential energy and returns to its original shape. The flattening wheel 74 will roll from both sides along the welding area towards the center during the L-shaped elastic sheet 72 reset process, rolling and flattening the welding area once.

[0026] Please see Figures 3-6The shrinkage compensation mechanism 8 includes a push frame 81 fixed to the bottom of the mounting frame 54 and a friction rod 82 fixed to the lower pressure frame 12. A friction block 83 is slidably connected to the friction rod 82. The friction block 83 is fixed to the lower pressure shell 14, and the contact surface between the friction block 83 and the friction rod 82 is a frosted surface. A return spring 84 is provided between the friction block 83 and the lower pressure frame 12. The return spring 84 is sleeved on the friction rod 82. A side support 85 is fixed to one side of the friction block 83. A limiting ring is sleeved at the end of the friction rod 82 to prevent the friction block 83 and the side support 85 from falling out of the friction rod 82. An inclined surface is provided at the bottom of the side support 85. A wedge-shaped surface is provided on the push frame 81 to abut against the inclined surface. When the push frame 81 and the side support 85 are not in contact, the elastic force of the return spring 84 exceeds the friction between the friction rod 82 and the friction block 83. At this time, the return spring 84 will press the side support 85 against the limit ring. During welding, the ultrasonic welding head 63 will abut against the welding lower mold 17. At this time, the push frame 81 is below the side support 85 and does not contact the side support 85. After welding, the lifting module 5 drives the mounting frame 54 to move up to the upper limit position. At this time, the push frame 81 will abut against the inclined surface at the bottom of the side support 85 through the wedge surface. Under the squeezing action of the inclined surface, the friction block 83 will drive the lower pressure shell 14 to move slightly towards the center to compensate for the shrinkage trend of the material after welding. After the compensation is completed, the clamping cylinder 11 will drive the lower pressure shell 14 to move up and release the fixation of the battery cell. Then the lifting module 5 will drive the mounting frame 54 to move down slightly, so that the push frame 81 is removed from the height position of the side support 85. At this time, the lower pressure shell 14 will be reset under the action of the return spring 84 and wait for the next welding.

[0027] Please see Figures 4-6The flue gas capture mechanism 9 includes a capture shell 91 symmetrically fixed on the clamping table 10. An absorbent cotton layer is fixed on one side of the capture shell 91, facing the welding lower mold 17. A connecting shaft 92 is rotatably connected inside the capture shell 91. An exhaust fan 93 is fixedly sleeved on one end of the connecting shaft 92. An outer ring body 94 is rotatably connected to the connecting shaft 92. A plurality of elastic abutment pieces 95 arranged in a circle are provided inside the outer ring body 94. One end of each elastic abutment piece 95 abuts against a recess on the connecting shaft 92. In the groove, the outer ring body 94 is provided with multiple support blocks 96 that limit the deformation state of the elastic abutment pieces 95. The outer ring body 94 is connected to the transmission rack 97 through the meshing of the teeth on its outer wall. The bottom of the transmission rack 97 is provided with a support shaft 98, which is slidably connected in the outer sleeve 99. The bottom end of the support shaft 98 is fixed with a support spring 90 located inside the outer sleeve 99. The bottom end of the outer sleeve 99 is fixed on the transverse frame 43. In the non-stressed state, under the support of the support spring 90, the support... The support shaft 98 slides on the upper part of the outer sleeve 99. During welding, as the outer shell 61 moves downward, it abuts against the top of the transmission rack 97 and continues to move downward. The support spring 90 is compressed. During this process, the support block 96 cannot effectively limit the elastic abutment piece 95. The groove on the connecting shaft 92 cannot abut against the elastic abutment piece 95 to form a stable transmission. The connecting shaft 92 does not rotate with the outer ring body 94. After welding, the outer shell 61 moves upward and returns to its original position. During this process, the support spring 90 returns to its original length. The transmission rack 97 meshes with the teeth on the outer ring body 94, causing the outer ring body 94 to rotate in the opposite direction. At this time, the support block 96 restricts the reverse bending of the elastic abutment piece 95. One end of the elastic abutment piece 95 abuts against the groove on the connecting shaft 92, driving the connecting shaft 92 and the exhaust fan 93 to rotate. The rotation of the exhaust fan 93 generates negative pressure at the position of the capture shell 91, causing airflow to pass through the adsorption cotton layer and enter the capture shell 91 in the welding area. Under the action of the airflow, the flue gas is adsorbed and captured by the adsorption cotton layer.

[0028] It should be noted that, in the use of this ultrasonic welding equipment for sodium-ion battery cell tabs, the cell to be welded is first placed on the clamping table 10. Then, the clamping cylinder 11 drives the lower pressure frame 12 to move down. The lower pressure frame 12 drives the lower pressure shells 14 on both sides to press down synchronously through the sliding rod 13, so that the lower pressure pad 18 presses the cell tightly. The anti-slip plate at the bottom prevents the cell from slipping. At the same time, the tab pressing plate 19 limits and presses the area adjacent to the tab to prevent the tab from shifting, lifting or misaligning before welding, thus completing the pre-welding clamping and positioning. After clamping is completed, the transverse module 4 is started. The transverse motor 42 drives the transverse screw to rotate. The transverse screw drives the transverse frame 43 to move through the ball nut, thereby driving the clamping table 10 and the cell to be fed laterally, thus completing the precise alignment before welding. After alignment, the lifting module 5 is activated, and the lifting motor 52 drives the lifting screw to rotate. The lifting screw drives the lifting frame 53 to move down through the ball nut, which in turn drives the mounting frame 54 and the ultrasonic welding unit 6 to move down as a whole. During the downward movement, the flattening wheel 74 in the flattening mechanism 7 first contacts the electrode tab and the welding connecting piece. Then, as the pressure continues to increase, the L-shaped elastic piece 72 gradually undergoes elastic deformation, and the flattening wheel 74 rolls and unfolds to both sides, allowing the ultrasonic welding head 63 to continue to move down and contact the electrode tab. During the welding process, the flattening wheel 74, together with the electrode tab pressing piece 19, plays an auxiliary limiting role for the electrode tab, preventing the electrode tab from being misaligned during welding. After the ultrasonic welding head 63 moves down and abuts against the electrode tab and the welding connecting piece, the ultrasonic generator starts to work and transmits ultrasonic vibration to the ultrasonic welding head 63 through the amplitude transformer 62. The electrode tab welding is completed under the combined action of pressure and high-frequency vibration. During the above process, as the ultrasonic welding unit 6 presses down, the transmission rack 97 moves down, but at this time the connecting shaft 92 is not effectively driven, and the exhaust fan 93 does not work. After welding is completed, the lifting module 5 reverses and drives the ultrasonic welding unit 6 to move upward and reset. During the upward movement, the L-shaped elastic sheet 72 in the flattening mechanism 7 releases its elastic potential energy and recovers, causing the flattening wheel 74 to roll from both sides along the welding area towards the center during the reset process. This rolls and flattens the welded electrode tabs, correcting the warping formed during welding and improving the flatness and fit of the welded electrode tabs. At the same time, as the outer shell 61 releases its pressure on the transmission rack 97, the support spring 90 recovers and pushes the transmission rack 97 to move. The transmission rack 97 meshes with the outer ring 94 to rotate. The outer ring 94 drives the connecting shaft 92 to rotate through the elastic abutment piece 95, thereby driving the exhaust fan 93 to rotate. After the exhaust fan 93 rotates, it creates a negative pressure airflow, causing the flue gas near the welding area to pass through the absorbent cotton layer and be absorbed and collected by the capture shell 91, thereby reducing flue gas retention and fall, and preventing contamination of the electrode tabs. On the surface; when the lifting module 5 moves the ultrasonic welding unit 6 to the limit position, the mounting frame 54 drives the wedge-shaped surface of the push frame 81 to press the inclined surface at the bottom of the side support 85, causing the friction block 83 to move along the friction rod 82, and causing the lower pressure shell 14 to move slightly towards the center, thereby pushing the clamped battery cell to move slightly towards the center to compensate for the material shrinkage caused by local temperature rise and cooling contraction after welding, reduce the tensile stress after electrode welding, and prevent the occurrence of breakage, cracking or stress concentration at the connection part; after the compensation is completed, the clamping cylinder 11 is reset, driving the lower pressure frame 12 to move upward, so that the lower pressure shell 14, lower pressure pad 18 and electrode pressure plate 19 release the pressure on the battery cell and electrode, completing the loosening. Then the lifting module 5 drives the push frame 81 to leave the range of action of the side support 85. At this time, the lower pressure shell 14 automatically returns to its position under the action of the return spring 84, and the shrinkage compensation mechanism 8 returns to its initial state.

[0029] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An ultrasonic welding device for cell tabs in sodium-ion battery production, comprising an outer casing (1), characterized in that: The outer casing (1) is equipped with a processing table (2), and multiple mounting plates (3) are symmetrically arranged on the processing table (2). Each mounting plate (3) is equipped with a transverse moving module (4) and a lifting module (5). The lifting module (5) is equipped with an ultrasonic welding unit (6), and the ultrasonic welding unit (6) is equipped with a flattening mechanism (7). The transverse moving module (4) is equipped with a clamping platform (10) for placing the battery cell. The clamping platform (10) is equipped with a shrinkage compensation mechanism (8) and a flue gas capture mechanism (9). A clamping cylinder (11) is fixed to the bottom of the clamping platform (10). A lower pressure frame (12) is fixedly connected to the output end of the clamping cylinder (11). A sliding rod (13) is fixed to the lower pressure frame (12). Both ends are slidably connected to a lower pressure shell (14). The shrinkage compensation mechanism (8) includes a push frame (81) fixed on the lifting module (5) and a friction rod (82) fixed on the lower pressure frame (12). A friction block (83) is slidably connected on the friction rod (82). The friction block (83) is fixed on the lower pressure shell (14), and the contact surface between the friction block (83) and the friction rod (82) is a frosted surface. A reset spring (84) is provided between the friction block (83) and the lower pressure frame (12). The reset spring (84) is sleeved on the friction rod (82). A side support (85) is fixed on one side of the friction block (83). An inclined surface is opened at the bottom of the side support (85). A wedge-shaped surface that abuts the inclined surface is provided on the push frame (81).

2. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 1, characterized in that: The flue gas capture mechanism (9) includes a capture shell (91) symmetrically fixed on the clamping platform (10). An absorbent cotton layer is fixed on one side of the capture shell (91). A connecting shaft (92) is rotatably connected inside the capture shell (91). An exhaust fan (93) is fixedly sleeved on one end of the connecting shaft (92).

3. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 2, characterized in that: An outer ring body (94) is rotatably connected to the connecting shaft (92). Multiple elastic abutment pieces (95) arranged in a circular pattern are provided inside the outer ring body (94). One end of the elastic abutment piece (95) abuts against a groove opened on the connecting shaft (92). Multiple support blocks (96) that restrict the deformation state of the elastic abutment piece (95) are provided on the outer ring body (94). The outer ring body (94) is connected to the transmission rack (97) through the meshing of the teeth on the outer wall. A support shaft (98) is provided at the bottom of the transmission rack (97). The support shaft (98) is slidably connected in the outer sleeve (99), and a support spring (90) located in the outer sleeve (99) is fixed at the bottom end of the support shaft (98).

4. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 1, characterized in that: The flattening mechanism (7) includes a connecting plate (71), with L-shaped elastic sheets (72) symmetrically arranged at the bottom of the connecting plate (71). A side support rod (73) is rotatably connected to the bottom of the connecting plate (71), and a flattening wheel (74) is rotatably connected to the side support rod (73). A reset rod (75) is slidably connected in the long slot in the middle of the side support rod (73), and the reset rod (75) is fixed on the L-shaped elastic sheet (72).

5. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 1, characterized in that: The clamping platform (10) is uniformly rotatably connected to the support roller (15). The top of the clamping platform (10) is symmetrically provided with guide columns (16) that are slidably connected to the lower pressure frame (12). The center of the top of the clamping platform (10) is provided with a welding lower mold (17) for supporting the electrode tab. The welding lower mold (17) is located between two lower pressure shells (14). The bottom of the lower pressure shell (14) is slidably connected with a lower pressure pad (18). The lower pressure shell (14) and the lower pressure pad (18) are connected by a spring. The bottom of the lower pressure pad (18) is provided with an anti-slip plate, and one side of the lower pressure pad (18) is provided with an electrode tab pressure plate (19) to prevent electrode tab misalignment.

6. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 3, characterized in that: The transverse module (4) includes a transverse housing (41) fixed on the mounting plate (3), a transverse motor (42) fixed on the transverse housing (41), and a transverse lead screw fixedly connected to the output end of the transverse motor (42), which is rotatably connected to the transverse housing (41).

7. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 6, characterized in that: The transverse shell (41) is slidably connected to a transverse frame (43) that is connected to the transverse screw. The clamping platform (10) is fixed on the transverse frame (43), and the bottom end of the outer sleeve (99) is fixed on the transverse frame (43).

8. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 4, characterized in that: The lifting module (5) includes a lifting shell (51) fixed on the mounting plate (3), a lifting motor (52) fixed on the top of the lifting shell (51), a lifting screw fixedly connected to the output end of the lifting motor (52), the lifting screw being rotatably connected to the lifting shell (51), and a lifting frame (53) slidably connected to the lifting shell (51) in cooperation with the lifting screw.

9. The ultrasonic welding equipment for cell tabs in sodium-ion battery production according to claim 8, characterized in that: The lifting frame (53) is fixed to one side of the mounting frame (54), and the push frame (81) is fixed to the bottom of the mounting frame (54).

10. An ultrasonic welding device for cell tabs in sodium-ion battery production according to claim 9, characterized in that: The ultrasonic welding unit (6) includes an outer shell (61) fixed on a mounting bracket (54), a connecting flange at the bottom of the outer shell (61), an amplitude transformer (62) fixed at the bottom of the connecting flange, an ultrasonic generator connected to the amplitude transformer (62) inside the outer shell (61), an ultrasonic welding head (63) fixed at the bottom of the amplitude transformer (62), and a connecting plate (71) fixed on the connecting flange.

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