An automatic welding device for lithium battery electrode sheet

Abstract

The present application relates to welding, more particularly to the technical field of ultrasonic welding, and discloses an automatic welding device for lithium battery electrode sheets, which comprises an ultrasonic metal spot welding machine, a tool assembly is arranged on the ultrasonic metal spot welding machine, a tension part is connected to the tool assembly, a welding part is arranged on the amplitude bar of the ultrasonic metal spot welding machine, a feeding part is installed on the base of the ultrasonic metal spot welding machine, the tool assembly comprises a U-shaped tool plate, linkage cooperation between the toothed arm, the gear and the tension part is achieved, automatic clamping and tensioning operation of the electrode sheet tab is realized, and the operation mode of the prior art relies on manual holding of the battery core for positioning, the positioning randomness problem caused by manual operation is eliminated, the flexible electrode sheet tab can be straightened, the deformation conditions such as warping, wrinkling and deviation of the electrode sheet tab are inhibited, and the flat state of the electrode sheet tab before welding is ensured.

Description

Technical Field

[0001] This invention relates to welding, and more specifically to the field of ultrasonic welding technology, specifically to an automated welding device for lithium battery electrode sheets. Background Technology

[0002] With the rapid development of new energy storage equipment, portable electronic devices, and new energy vehicles, lithium-ion batteries have become a core component in the energy storage and power supply field due to their high energy density, long cycle life, and excellent charge / discharge performance. As the core structural component of a lithium-ion battery, the welding process between its internal electrode tabs and busbars is a crucial step in ensuring stable current transmission and reliable structural assembly, directly determining the conductivity, mechanical stability, and safety of the finished battery. In the mass production of lithium batteries, ultrasonic metal welding, with its advantages of no high-temperature thermal damage, minimal welding deformation, and compatibility with thin foil welding, is widely used in the connection and processing of multi-layer electrode tabs and busbars.

[0003] Currently, the mainstream ultrasonic welding process for electrodes and busbars in the industry is still mainly a semi-automated welding mode with manual positioning. In the conventional processing flow, the busbar is placed freely in the welding station area of ​​the ultrasonic welding equipment, relying on the equipment table for basic support. At the same time, there is no automated clamping and positioning mechanism for the battery cells and electrode assemblies to be welded. The entire process relies on the operator to hold the battery cells by hand for alignment and manually adjust the relative welding positions of the electrodes and busbars. During the welding operation, the electrode and busbar are bonded together solely by the extrusion force of the ultrasonic welding head. The entire alignment, bonding, and welding process relies entirely on manual operating experience and the equipment's pressure reference to complete the welding operation. This is a standardized processing technology commonly used by small and medium-sized lithium battery manufacturers and conventional mass production lines, suitable for traditional low-precision and low-capacity production modes.

[0004] In practical mass production applications, the existing ultrasonic welding process for battery tabs and busbars suffers from significant drawbacks. The overall positioning is highly random and lacks stability. The busbars lack a fixed limiting structure, making them prone to shifting, misalignment, and tilting during placement at the workstation. Manual cell positioning is highly susceptible to variations in operator skill, operating conditions, and techniques, making it impossible to guarantee consistent welding positions for each batch and hindering control over welding positioning accuracy. Furthermore, the battery tabs are made of thin, flexible foil material with extremely low rigidity and a soft texture. Without external tension, the tabs are prone to warping, wrinkling, misalignment, and springback, making it impossible to maintain a flat and fitted state before welding. This results in uneven gaps between the tabs and busbars during welding, easily leading to defects such as incomplete welds, false welds, partial leaks, and insufficient weld area. Therefore, an automated welding device for lithium battery electrodes is proposed to address these issues. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an automated welding device for lithium battery electrode sheets. It solves the problems of existing ultrasonic welding processes for electrode tabs and busbars that rely on manual hand-held positioning, which is highly random and unstable. Flexible electrode tabs are unrestrained and prone to warping, deviation, wrinkling, and deformation, resulting in uneven bonding and quality defects such as incomplete welding, false welding, and insufficient welding area. At the same time, manual operations have low automation and low production efficiency.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an automated welding device for lithium battery electrode sheets, comprising an ultrasonic metal spot welder, wherein the ultrasonic metal spot welder is provided with a tooling assembly, a tensioning part is connected to the tooling assembly, a welding part is provided on the amplitude transformer of the ultrasonic metal spot welder, and a feeding part is installed on the base of the ultrasonic metal spot welder. The tooling assembly includes a U-shaped tooling plate, which is fixedly connected to the base of the ultrasonic metal spot welder. A bidirectional stud is rotatably connected between the two lugs of the U-shaped tooling plate, and a limit rod is fixedly connected to each of the two lugs of the U-shaped tooling plate. The tensioning part includes a support arm, which is threadedly connected to one thread of the bidirectional stud. The support arm is simultaneously slidably connected to the limit rod. A guide arm is fixedly connected to the end of the support arm, and a clamping arm is rotatably connected to the guide arm. A torsion spring is elastically connected between the rotating end of the clamping arm and the guide arm.

[0007] Preferably, there are two tension sections, which are symmetrically arranged, and the arms of the two tension sections are threadedly connected to the positive and negative threads of the bidirectional stud.

[0008] Preferably, the sides of the clamping arms in the two tension sections that are close to each other are both arc-shaped structures, and the sides of the guide arms in the two tension sections that are close to each other are both arc-shaped structures.

[0009] Preferably, an L-shaped tooling plate is fixedly connected to the two ear ends of the U-shaped tooling plate on the side that is far apart from each other. A lithium battery pack is provided on both L-shaped tooling plates. An electrode tab is provided on each lithium battery pack. The electrode tab is clamped between the guide arm and the clamping arm in the two tension parts.

[0010] Preferably, the welding part includes a welding head seat, which is mounted on the amplitude transformer of the ultrasonic metal spot welding machine. A toothed arm is fixedly connected to one side of the welding head seat, and a gear that meshes with the toothed arm is fixedly sleeved in the middle of the bidirectional stud.

[0011] Preferably, an ultrasonic welding head is installed on the welding head holder, wedge-shaped blocks are symmetrically connected to both sides of the ultrasonic welding head, a groove is opened at the bottom of the ultrasonic welding head, a pressure block is slidably connected to the inner wall of the groove, the pressure block abuts against the clamping arm, and both sides of the pressure block are arc-shaped structures.

[0012] Preferably, a sliding rod is fixedly connected to the top of the pressure block, and a rod hole is opened at the top of the inner wall of the groove to slide with the sliding rod. A spring is elastically connected between the end of the sliding rod and the inner wall of the rod hole.

[0013] Preferably, the feeding part includes an anvil, which is installed on the base of the ultrasonic metal spot welding machine. The top of the anvil has a groove, and a positioning block is slidably connected to the inner wall of the groove. Both sides of the positioning block are arc-shaped structures, and a spring is elastically connected between the positioning block and the inner wall of the groove.

[0014] Preferably, the top of the anvil is provided with a manifold, the manifold has a notch, the manifold is inserted into the positioning block through the notch, and the guide arm abuts against the positioning block and the manifold.

[0015] Preferably, the ultrasonic welding head is pressed between the electrode tab and the busbar, and the ultrasonic welding head is abutted between the electrode tab, the busbar and the anvil.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides an automated welding device for lithium battery electrode sheets, which has the following advantages: 1. Through the linkage between the toothed arm, gear, bidirectional stud and tensioning unit, the automatic clamping and tensioning of the electrode tabs is achieved. Unlike the existing technology that relies on manual hand-held positioning of the battery cell, this eliminates the randomness of positioning caused by manual operation. It can straighten the flexible electrode tabs and suppress deformation such as warping, wrinkling and deviation of the electrode tabs, ensuring the flatness of the electrode tabs before welding.

[0017] 2. By cooperating with the clamping arm, guide arm and torsion spring, and combining the wedge block to constrain the position of the clamping arm, the clamping arm can automatically open and close with the movement of the equipment station. Unlike the welding process that lacks an automated clamping mechanism in the existing technology, it does not require manual intervention in the clamping operation of the electrode tabs. It can be adapted to the welding operation process of the whole machine, reduce manual intervention process and improve the automation level of the device operation process.

[0018] 3. By combining the pressure block, slide bar and spring, the pressure block can achieve elastic yielding function. During the ultrasonic welding head pressing down welding process, the guide arm and clamping arm can be released from the side of the electrode tab. Unlike rigid clamping structure, this avoids the clamping components from pulling hard on the electrode tab during the welding stage, reduces the probability of the electrode tab being torn and damaged, and ensures the integrity of the workpiece structure.

[0019] 4. Through the cooperation of the anvil, positioning block and spring 2, the busbar is limited and positioned. The guide arm can be pressed down to drive the positioning block to retract and eliminate structural interference. Unlike the existing processing mode where the busbar can be freely placed without limit, this method can constrain the position of the busbar, reduce the occurrence of busbar offset and misalignment, and ensure the relative position stability between the busbar and the tensioned electrode tab. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall back structure of the present invention; Figure 3 For the present invention Figure 1 Enlarged view of A in the middle; Figure 4 This is a schematic diagram of the tooling assembly of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of B in the middle; Figure 6 This is a schematic diagram of the welded part of the present invention; Figure 7 This is an exploded view of the welded part of the present invention; Figure 8 This is a schematic diagram of the feeding section of the present invention.

[0021] In the diagram: 1. Ultrasonic metal spot welding machine; 2. Tooling assembly; 21. U-shaped tooling plate; 22. L-shaped tooling plate; 23. Bidirectional stud; 24. Limiting rod; 25. Gear; 26. Gear arm; 3. Tension section; 31. Support arm; 32. Guide arm; 33. Clamping arm; 34. Torsion spring; 4. Welding section; 41. Welding head seat; 42. Ultrasonic welding head; 43. Wedge block; 44. Pressure block; 45. Slide rod; 46. Rod hole; 47. Spring 1; 5. Feeding section; 51. Anvil; 52. Positioning block; 6. Lithium battery pack; 7. Electrode tab; 8. Busbar. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 - Figure 8 The present invention provides an automated welding device for lithium battery electrode sheets, including an ultrasonic metal spot welder 1, a tooling assembly 2 on the ultrasonic metal spot welder 1, a tensioning part 3 connected to the tooling assembly 2, a welding part 4 on the amplitude transformer of the ultrasonic metal spot welder 1, and a feeding part 5 installed on the base of the ultrasonic metal spot welder 1.

[0024] In use, the ultrasonic metal spot welding machine 1 provides ultrasonic vibration output and lifting drive, the tooling assembly 2 provides the installation base and motion guide for the tension unit 3, the tension unit 3 is used to clamp and tension the electrode tabs 7, the welding unit 4 rises and falls with the ultrasonic metal spot welding machine 1, outputs ultrasonic vibration to complete the welding operation, and the loading unit 5 realizes the positioning and bearing of the busbar 8.

[0025] Furthermore, the tooling assembly 2 includes a U-shaped tooling plate 21, which is fixedly connected to the base of the ultrasonic metal spot welding machine 1. A bidirectional stud 23 is rotatably connected between the two lugs of the U-shaped tooling plate 21. A limit rod 24 is fixedly connected to each of the two lugs of the U-shaped tooling plate 21. The tension part 3 includes a support arm 31, which is threadedly connected to one side of the thread of the bidirectional stud 23. The support arm 31 is also slidably connected to the limit rod 24. A guide arm 32 is fixedly connected to the end of the support arm 31. A clamping arm 33 is rotatably connected to the guide arm 32. A torsion spring 34 is elastically connected between the rotating end of the clamping arm 33 and the guide arm 32.

[0026] In use, the U-shaped tooling plate 21 supports the bidirectional stud 23 and the limiting rod 24. When the bidirectional stud 23 rotates, it drives the support arm 31 to generate displacement through the threaded pair. The limiting rod 24 constrains the rotation of the support arm 31, so that the support arm 31 can only move in a straight line along the limiting rod 24. The guide arm 32 moves synchronously with the support arm 31. The clamping arm 33 can rotate relative to the guide arm 32. The torsion spring 34 continuously applies an elastic force away from the guide arm 32 to the clamping arm 33.

[0027] In this embodiment, there are two tension sections 3, which are symmetrically arranged. The support arms 31 in the two tension sections 3 are threaded to the positive and negative threads of the bidirectional stud 23, respectively. The clamping arms 33 in the two tension sections 3 have an arc-shaped structure on the side that is close to each other, and the guide arms 32 in the two tension sections 3 have an arc-shaped structure on the side that is close to each other. The two ears of the U-shaped tooling plate 21 are fixedly connected to the side that is far apart from each other, and the lithium battery pack 6 is provided on the two L-shaped tooling plates 22. The lithium battery pack 6 is provided with electrode tabs 7, which are clamped between the guide arms 32 and clamping arms 33 in the two tension sections 3, respectively.

[0028] In use, the bidirectional stud 23 rotates, and the two sets of support arms 31 are driven to move synchronously towards each other or away from each other by the positive and negative threads. The arc surfaces of the clamping arm 33 and the guide arm 32 are used to cooperate with the external components at an angle to realize the opening and closing action of the clamping arm 33. The L-shaped tooling plate 22 is used to place and position the lithium battery pack 6. After the lithium battery pack 6 is placed in place, the electrode tabs 7 extend into the space between the guide arm 32 and the clamping arm 33. The guide arm 32 and the clamping arm 33 cooperate to complete the clamping and fixing of the electrode tabs 7.

[0029] It is worth noting that the welding part 4 includes a welding head seat 41, which is mounted on the amplitude transformer of the ultrasonic metal spot welding machine 1. A toothed arm 26 is fixedly connected to one side of the welding head seat 41. A gear 25 that meshes with the toothed arm 26 is fixedly sleeved in the middle of the bidirectional stud 23. An ultrasonic welding head 42 is mounted on the welding head seat 41. Wedge blocks 43 are symmetrically connected to both sides of the ultrasonic welding head 42. A groove is opened at the bottom of the ultrasonic welding head 42. A pressure block 44 is slidably connected to the inner wall of the groove. The pressure block 44 abuts against the clamping arm 33. Both sides of the pressure block 44 are arc-shaped structures. A sliding rod 45 is fixedly connected to the top of the pressure block 44. A rod hole 46 that slides with the sliding rod 45 is opened at the top of the inner wall of the groove. A spring 47 is elastically connected between the end of the sliding rod 45 and the inner wall of the rod hole 46.

[0030] In use, the welding head seat 41 moves up and down synchronously with the amplitude transformer, while transmitting ultrasonic vibration. During the lifting and lowering process, the welding head seat 41 drives the toothed arm 26 to move synchronously. The toothed arm 26 meshes with the gear 25, converting the linear displacement of the welding head seat 41 into the rotational motion of the gear 25 and the bidirectional stud 23. The ultrasonic welding head 42 moves up and down and cooperates with the wedge block 43 to control the opening angle of the clamping arm 33. The pressure block 44 can slide vertically along the inside of the groove. The slide rod 45 cooperates with the rod hole 46 to limit the sliding trajectory of the pressure block 44. The spring 47 applies a downward elastic preload to the pressure block 44. When the pressure block 44 contacts the clamping arm 33, it can elastically retract.

[0031] It is worth noting that the feeding part 5 includes an anvil 51, which is installed on the base of the ultrasonic metal spot welding machine 1. The top of the anvil 51 is provided with a sliding groove, and a positioning block 52 is slidably connected to the inner wall of the sliding groove. Both sides of the positioning block 52 are arc-shaped structures. A spring is elastically connected between the positioning block 52 and the inner wall of the sliding groove. A busbar 8 is provided on the top of the anvil 51. A notch is provided on the busbar 8. The busbar 8 is inserted into the positioning block 52 through the notch. The guide arm 32 abuts against the positioning block 52 and the busbar 8. The ultrasonic welding head 42 is pressed between the electrode tab 7 and the busbar 8. The ultrasonic welding head 42 abuts against the anvil 51 through the electrode tab 7 and the busbar 8.

[0032] In use, the anvil 51 serves as the support base for welding, and the positioning block 52 can slide vertically along the inside of the groove. The second spring applies an upward elastic restoring force to the positioning block 52. The busbar 8 is fitted onto the outside of the positioning block 52 through a notch, thus limiting the positioning of the busbar 8. When the guide arm 32 moves to the position of the positioning block 52, the guide arm 32 presses down on the positioning block 52, and the positioning block 52 retracts into the groove against the elastic force of the second spring. During welding, the ultrasonic welding head 42 moves downward and presses the electrode tab 7 onto the busbar 8. The busbar 8 is pressed against the top surface of the anvil 51, thus realizing the force transmission under welding conditions.

[0033] Working principle: In the initial state, the amplitude rod of the ultrasonic metal spot welding machine 1 drives the welding part 4 to the upward position, the ultrasonic welding head 42 and the anvil 51 are separated from each other, and the two sets of tension parts 3 are kept far apart from each other under the drive of the bidirectional stud 23. The busbar 8 is inserted into the positioning block 52 of the feeding part 5 through its own notch. The positioning block 52 is in the upward extension state under the elastic force of the spring 2, thus completing the positioning constraint of the busbar 8 on the top surface of the anvil 51. The operator places two sets of lithium battery packs 6 on the L-shaped fixture plates 22 fixed on both sides of the U-shaped fixture plate 21. After the lithium battery packs 6 are assembled, the electrode tabs 7 led out from the lithium battery packs 6 are placed in the gap between the guide arm 32 and the clamping arm 33. The clamping arm 33 is kept open under the elastic force continuously applied by the torsion spring 34 away from the guide arm 32. The arc surface of the clamping arm 33 abuts against the inclined surface of the wedge block 43 set on both sides of the ultrasonic welding head 42. The wedge block 43 limits the position of the clamping arm 33, so that the clamping arm 33 is kept in the open position with the guide arm 32. At this time, the electrode tabs 7 are only placed inside the open position and have not yet been clamped by the guide arm 32 and the clamping arm 33, thus completing the pre-placement process of the workpiece before welding. When the equipment starts the welding process, the lifting slide of the ultrasonic metal spot welding machine 1 drives the transducer and the amplitude rod to move downward. The welding head seat 41 installed on the amplitude rod moves downward accordingly. The welding head seat 41 drives the toothed arm 26 fixed on the welding head seat 41 to move downward in a straight line in sync. On the other hand, it drives the ultrasonic welding head 42, wedge block 43 and pressure block 44 to move downward in sync. During the downward movement of the toothed arm 26, it meshes with the gear 25 fixedly sleeved in the middle of the bidirectional stud 23. The downward linear movement of the toothed arm 26 is converted into the rotational movement of the gear 25. The gear 25 drives the bidirectional stud 23 to rotate between the two lugs of the U-shaped tooling plate 21. The bidirectional stud 23 is provided with two sections of threads, one positive and one negative. The limiting rod 24 fixed on the U-shaped tooling plate 21 forms a rotation limit on the support arm 31, restricting the support arm 31 from circumferential rotation. The two sets of tension sections 3 and their corresponding support arms 31 respectively form a threaded pair with the two sections of the positive and negative threads of the bidirectional stud 23. The rotation of the bidirectional stud 23 drives the two support arms 31 to overcome external resistance and move synchronously in opposite directions along the guide direction of the limit rod 24. The support arms 31 drive the guide arms 32, which are fixedly connected at the end, to move together toward the center position of the welding station. The clamping arm 33 moves horizontally synchronously with the guide arm 32. The arc surface of the clamping arm 33 slides continuously relative to the inclined surface of the wedge block 43. The wedge block 43 applies a lateral pushing force to the clamping arm 33. This force overcomes the elastic force applied by the torsion spring 34 to the clamping arm 33 away from the guide arm 32, causing the clamping arm 33 to rotate relative to the guide arm 32. The opening angle between the clamping arm 33 and the guide arm 32 gradually decreases. The guide arm 32 and the clamping arm 33 move closer to each other, realizing the clamping of the electrode tab 7 placed between them. As the two support arms 31 continue to feed towards each other, the clamped electrode tabs 7 are straightened and tightened by the horizontal tension, eliminating the wrinkles, warping and bending deformation of the electrode tabs 7 themselves, keeping the electrode tabs 7 in a flat state. As the guide arm 32 continues to move towards the center, the arc surfaces of the guide arms 32 approach each other and contact the arc surfaces of the positioning block 52. The guide arm 32 applies downward pressure to the positioning block 52, and the positioning block 52 overcomes the upward elastic force of the spring and slides downward along the groove of the anvil 51 until the upper surface of the positioning block 52 is on the same plane as the upper surface of the busbar 8, eliminating the structural interference caused by the positioning block 52 being higher than the busbar 8, and reserving space for the subsequent guide arm 32 and clamping arm 33 to enter the groove at the bottom of the ultrasonic welding head 42. As the guide arm 32 and clamping arm 33 feed towards the center area of ​​the welding head, the clamping arm 33 contacts the side arc surface of the pressure block 44, and the clamping arm 33 exerts an upward squeezing force on the pressure block 44. The pressure block 44 forms a sliding pair with the rod hole 46 through the slide rod 45. After the pressure block 44 is subjected to the squeezing force, it slides upward along the bottom groove of the ultrasonic welding head 42. The slide rod 45 simultaneously retracts into the rod hole 46. The spring 47 connected between the end of the slide rod 45 and the inner wall of the rod hole 46 is compressed and produces elastic deformation. The spring 47 accumulates downward elastic potential energy. After the pressure block 44 retracts upward, it makes enough space in the groove for the guide arm 32 and clamping arm 33 holding the electrode tab 7 to enter the groove. When the guide arm 32 and clamping arm 33 enter the groove, the electrode tab 7, which is straightened and tensioned by the tension part 3, is exactly parallel to the upper surface of the busbar 8. At this time, the ultrasonic welding head 42 continues to feed downward with the amplitude transformer. The lower end face of the ultrasonic welding head 42 presses against the already tensioned and flattened electrode tab 7, pressing the electrode tab 7 tightly against the surface of the busbar 8. The busbar 8 is pressed against the supporting top surface of the anvil 51. The ultrasonic metal spot welding machine 1 outputs ultrasonic vibration. The vibration is transmitted to the ultrasonic welding head 42 through the amplitude transformer and the welding head seat 41. Ultrasonic solid phase welding is completed between the ultrasonic welding head 42, the electrode tab 7, the busbar 8 and the anvil 51. During the welding process, the clamping arm 33 remains in elastic contact with the pressure block 44. Under the action of the spring 47, the pressure block 44 can continue to move upward. The guide arm 32 and the clamping arm 33 can disengage from the side of the electrode tab 7 under the force generated by the downward pressure of the welding head, thereby releasing the clamping constraint of the tension part 3 on the electrode tab 7 and avoiding the rigid clamping and pulling that causes the electrode tab 7 to tear and break. After the welding process is completed, the ultrasonic metal spot welding machine 1 drives the amplitude transformer to reset upwards. The welding head seat 41, toothed arm 26, ultrasonic welding head 42, and wedge block 43 move upwards in a linear motion simultaneously. When the toothed arm 26 moves upwards, it meshes with the gear 25 again, driving the gear 25 and the bidirectional stud 23 to rotate in opposite directions. The bidirectional stud 23 drives the two side arms 31 to move in a linear motion away from each other along the limit rod 24 through the positive and negative thread pairs. The two sets of tension parts 3 retract away from the center of the welding station, and the clamping arm 33 moves outwards with the guide arm 32. As clamping arm 33 gradually disengages from the inclined surface constraint of wedge block 43, torsion spring 34 outputs elastic force to clamping arm 33 again, causing it to move away from guide arm 32. Clamping arm 33 rotates relative to guide arm 32 and reopens. At the same time, guide arm 32 releases downward pressure on positioning block 52. Spring 2 releases elastic potential energy to push positioning block 52 to reset and extend upward along the slide groove. Pressure block 44 is no longer squeezed upward by clamping arm 33. Spring 1 47 releases compression deformation to drive slide rod 45 and pressure block 44 to reset and slide downward. The entire equipment returns to the initial standby state. At this point, the electrode tabs 7 of the two sets of lithium battery packs 6 have been welded and fixed onto the busbar 8. The operator can then remove the welded lithium battery pack 6 along with the busbar 8 from the device and proceed to the next cycle of workpiece clamping and welding operations.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An automated welding device for lithium battery electrode sheets, comprising an ultrasonic metal spot welder (1), characterized in that: The ultrasonic metal spot welding machine (1) is provided with a tooling assembly (2), a tensioning part (3) is connected to the tooling assembly (2), a welding part (4) is provided on the amplitude transformer of the ultrasonic metal spot welding machine (1), and a feeding part (5) is installed on the base of the ultrasonic metal spot welding machine (1). The tooling assembly (2) includes a U-shaped tooling plate (21), which is fixedly connected to the base of the ultrasonic metal spot welding machine (1). A bidirectional stud (2) is rotatably connected between the two lugs of the U-shaped tooling plate (21). 3) Limit rods (24) are fixedly connected to both ears of the U-shaped tooling plate (21). The tension part (3) includes a support arm (31). The support arm (31) is threadedly connected to one side thread of the bidirectional stud (23). The support arm (31) is also slidably connected to the limit rod (24). A guide arm (32) is fixedly connected to the end of the support arm (31). A clamping arm (33) is rotatably connected to the guide arm (32). A torsion spring (34) is elastically connected between the rotating end of the clamping arm (33) and the guide arm (32).

2. The automated welding device for lithium battery electrode sheets according to claim 1, characterized in that: There are two tension sections (3), which are symmetrically arranged. The support arms (31) of the two tension sections (3) are respectively threaded onto the positive and negative threads of the bidirectional stud (23).

3. The automated welding device for lithium battery electrode sheets according to claim 2, characterized in that: The clamping arms (33) of the two tension parts (3) are both arc-shaped on the side that is close to each other, and the guide arms (32) of the two tension parts (3) are both arc-shaped on the side that is close to each other.

4. The automated welding device for lithium battery electrode sheets according to claim 2, characterized in that: The two ears of the U-shaped tooling plate (21) are fixedly connected to the L-shaped tooling plate (22) on the side that is far apart from each other. The two L-shaped tooling plates (22) are each provided with a lithium battery pack (6). The lithium battery pack (6) is provided with an electrode tab (7). The electrode tab (7) is clamped between the guide arm (32) and the clamping arm (33) in the two tension parts (3).

5. The automated welding device for lithium battery electrode sheets according to claim 4, characterized in that: The welding part (4) includes a welding head seat (41), which is mounted on the amplitude rod of the ultrasonic metal spot welding machine (1). A toothed arm (26) is fixedly connected to one side of the welding head seat (41), and a gear (25) that meshes with the toothed arm (26) is fixedly sleeved in the middle of the bidirectional stud (23).

6. The automated welding device for lithium battery electrode sheets according to claim 5, characterized in that: An ultrasonic welding head (42) is installed on the welding head seat (41). Wedge blocks (43) are symmetrically connected on both sides of the ultrasonic welding head (42). A groove is provided at the bottom of the ultrasonic welding head (42). A pressure block (44) is slidably connected to the inner wall of the groove. The pressure block (44) abuts against the clamping arm (33). Both sides of the pressure block (44) are arc-shaped structures.

7. The automated welding device for lithium battery electrode sheets according to claim 6, characterized in that: The top of the pressure block (44) is fixedly connected to a sliding rod (45), and the top of the inner wall of the groove is provided with a rod hole (46) that slides with the sliding rod (45). A spring (47) is elastically connected between the end of the sliding rod (45) and the inner wall of the rod hole (46).

8. The automated welding device for lithium battery electrode sheets according to claim 6, characterized in that: The feeding part (5) includes an anvil (51), which is installed on the base of the ultrasonic metal spot welding machine (1). The top of the anvil (51) is provided with a sliding groove, and a positioning block (52) is slidably connected to the inner wall of the sliding groove. Both sides of the positioning block (52) are arc-shaped structures, and a spring is elastically connected between the positioning block (52) and the inner wall of the sliding groove.

9. The automated welding device for lithium battery electrode sheets according to claim 8, characterized in that: The top of the anvil (51) is provided with a busbar (8), and the busbar (8) has a notch. The busbar (8) is inserted into the positioning block (52) through the notch. The guide arm (32) abuts against the positioning block (52) and the busbar (8).

10. An automated welding device for lithium battery electrode sheets according to claim 9, characterized in that: The ultrasonic welding head (42) is pressed between the electrode tab (7) and the busbar (8), and the ultrasonic welding head (42) is abutted between the electrode tab (7), the busbar (8) and the anvil (51).

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