A high-efficiency ultrasonic metal welding device

Abstract

The present invention discloses a high-efficiency ultrasonic metal welding device, comprising: a bending welding mechanism, comprising a first welding head, a first amplitude transformer assembly and a first transducer; the first amplitude transformer assembly is connected to the side of the first welding head, and the axis of the first amplitude transformer assembly is perpendicular to the axis of the first welding head; one end of the first welding head has a first welding surface, and the first welding surface is perpendicular to the axis of the first welding head; a longitudinal vibration welding mechanism, comprising a second welding head, a second amplitude transformer assembly and a second transducer; the second amplitude transformer assembly is coaxially connected to the second welding head; the side of the second welding head has a second welding surface, and the second welding surface is parallel to the axis of the second welding head; the second welding surface is arranged opposite to the first welding surface; and a driving mechanism provides a coaxial driving force for the first welding head.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic welding devices, and in particular to a high-efficiency ultrasonic metal welding device. Background Art

[0002] In the field of welding, ultrasonic metal welding is a process between cold pressure welding and friction welding. During welding, the welding pressure acts vertically on the welding surface through the welding head weld point, and is superimposed with the shear force of high-frequency vibration. When the shear force exceeds the elastic limit of the material, part of the workpiece contact surface begins to slip. This shear force constantly changes direction at a frequency of tens of thousands of times per second during the welding process, breaking up and removing dirt from the workpiece surface, accepting the pure metal surface exposed between welding operations, and condensing it into place, causing gas discharge and the interpenetration of multiple micro-grains. As the high-frequency vibration continues, the metal contact area in this state continues to expand until it expands to the entire weld zone. The metal recrystallizes to form a fine-grained structure and presents the characteristics of metal cold solidification without oxidation.

[0003] With the development of new energy, the requirements for batteries are getting higher and higher, and the welding area of the tabs needs to be larger and larger by ultrasonic metal welding. For example, the tabs of the blade battery released by BYD need to be welded with dozens of stacked metal foils, and the welding area is as large as 80×8mm. Due to the large welding area, if a welding head with the same area as the welding area is used, the welding head will also have a welding zero point. Figure 1 , the welding area that is too long will be broken; the conventional ultrasonic metal welding structure currently uses a secondary welding of metal foil parts, which limits the length of each welding range and avoids welding zero; the welding ranges of the two weldings are superimposed to complete the processing; which has the following problems:

[0004] First, in conventional ultrasonic metal welding structures, the central axis of the welding pressure will deviate from the welding head welding point position. When welding the workpiece, the welding head welding point position will produce a welding reaction force. The welding reaction force will generate a welding reaction torque due to this deviation. When there are many metal foils, resulting in a long welding time, and the metal foil thickness is thin (such as 0.006-0.013mm), the long-term shearing of the metal foil by the welding head can easily damage the metal foil on the upper layer, resulting in a high scrap rate.

[0005] Second, since secondary welding is required, the processing period is long and the processing efficiency is low.

[0006] Third, secondary welding inevitably leads to repeated superposition, that is, the metal foil at the overlapping position is welded twice, resulting in the alternating hot and cold effect, which accelerates the aging of the metal foil and loosens it, causing interface phenomena, making the conductive effect worse and the lifespan shorter, etc., which overall reduces the quality of the battery. Summary of the Invention

[0007] In view of this, the present invention proposes a high-efficiency ultrasonic metal welding device to fundamentally solve the above-mentioned problems.

[0008] The technical solution of the present invention is achieved as follows:

[0009] A high-efficiency ultrasonic metal welding device, comprising:

[0010] A bending welding mechanism includes a first welding head, a first horn assembly, and a first transducer; the first transducer is coaxially connected to the first horn assembly, the first horn assembly is connected to a side of the first welding head, and the axis of the first horn assembly is perpendicular to the axis of the first welding head; one end of the first welding head has a first welding surface, and the first welding surface is perpendicular to the axis of the first welding head;

[0011] A longitudinal vibration welding mechanism includes a second welding head, a second horn assembly, and a second transducer; the second transducer is coaxially connected to the second horn assembly, and the second horn assembly is coaxially connected to the second welding head; the side of the second welding head has a second welding surface, the second welding surface is parallel to the axis of the second welding head; the second welding surface is arranged to face the first welding surface;

[0012] The driving mechanism provides a coaxial driving force for the first welding head.

[0013] As a further optional solution of the high-efficiency ultrasonic metal welding device, the axis of the first horn assembly is perpendicular to the axis of the second horn assembly.

[0014] As a further optional solution of the high-efficiency ultrasonic metal welding device, the second welding head is a full-wave welding head.

[0015] As a further optional solution for the high-efficiency ultrasonic metal welding device, the driving mechanism includes a driving cylinder, a cylindrical connecting head is provided at the end of the first welding head, and the piston rod of the driving cylinder is detachably connected to the connecting head through a fixing mechanism; the piston rod of the driving cylinder is coaxially arranged with the first welding head.

[0016] As a further optional solution for the high-efficiency ultrasonic metal welding device, the welding device also includes a base, on which a bracket is provided; the driving cylinder is arranged on the bracket, on which a vertically arranged slide rail is provided, and the fixing mechanism is connected to a slider, which slides in sliding engagement with the slide rail.

[0017] As a further optional solution for the high-efficiency ultrasonic metal welding device, an annular groove is provided on the outer peripheral wall of the connecting head; the fixing mechanism includes a base block, a buckle groove is provided on the base block, and both side walls of the buckle groove are provided with a first clamping strip for clamping into the annular groove; a base plate for blocking one end of the buckle groove is provided on the base block; a clamping block for blocking the other end of the buckle groove is provided on the base block, and a second clamping strip for clamping into the annular groove is provided on the clamping block; the base plate and the base block are fixedly connected as a whole or detachably connected; the clamping block and the base block are detachably connected.

[0018] As a further optional solution for the high-efficiency ultrasonic metal welding device, a support seat is provided on the base, and the longitudinal vibration welding mechanism is provided on the support seat; the longitudinal vibration welding mechanism is located below the bending welding mechanism; a mounting hole is provided on the base, and a slot hole is provided on the support seat, and a bolt is passed through the slot hole, and the bolt is threadedly connected to the mounting hole, thereby fixing the support seat to the base.

[0019] As a further optional solution of the high-efficiency ultrasonic metal welding device, the first horn assembly includes two first sub-horns, which are symmetrically arranged on both sides of the first welding head; the first transducer is connected to one of the first sub-horns.

[0020] As a further optional solution of the high-efficiency ultrasonic metal welding device, the first horn assembly includes a first sub-horn, one end of which is connected to the side of the first welding head and the other end is connected to the first transducer.

[0021] As a further optional solution of the high-efficiency ultrasonic metal welding device, the second horn assembly includes two second sub-horns, which are symmetrically arranged at both ends of the second welding head; the second transducer is connected to one of the second sub-horns.

[0022] The beneficial effects of the present invention are:

[0023] 1. The first welding head presses the metal foil onto the second welding head of the longitudinal vibration welding mechanism, and the driving mechanism provides a driving force to the bending welding mechanism coaxial with the first welding head. That is, the driving force of the driving mechanism is directly transmitted to the first welding head, eliminating the welding reaction torque and achieving forceless twisting welding. This reduces damage to the metal foil caused by the first welding head and improves the yield rate.

[0024] 2. The second welding head complements the first welding head, and the welding range of the second welding head covers the welding zero point of the first welding head, thereby completing the processing in one welding and effectively improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural diagram of a welding zero point when the welding range is too long;

[0027] Figure 2 This is a schematic structural diagram of a high-efficiency ultrasonic metal welding device according to the present invention;

[0028] Figure 3 It is a structural schematic diagram of the bending welding mechanism and the longitudinal vibration welding mechanism;

[0029] Figure 4 One of the exploded schematic diagrams of the fixing mechanism and the connector;

[0030] Figure 5 The second exploded schematic diagram of the fixing mechanism and the connector;

[0031] Figure 6 An exploded schematic diagram of the support seat and the base;

[0032] Figure 7 is a structural schematic diagram of a first horn assembly;

[0033] Figure 8 This is a schematic structural diagram of another first horn assembly.

[0034] In the figure: 1. Bending welding mechanism; 11. First welding head; 111. First welding surface; 12. First amplitude transformer assembly; 121. First sub-amplitude transformer; 13. First transducer; 2. Longitudinal vibration welding mechanism; 21. Second welding head; 211. Second welding surface; 22. Second amplitude transformer assembly; 221. Second sub-amplitude transformer; 23. Second transducer; 3. Driving mechanism; 31. Driving cylinder; 4. Base; 41. Mounting hole; 5. Bracket; 51. Slide rail; 52. Slider; 6. Support seat; 61. Slot hole; 7. Fixing mechanism; 71. Base block; 711. Buckle groove; 712. First clip strip; 72. Base plate; 73. Clamping block; 731. Second clip strip; 8. Connecting head; 81. Annular clip groove. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] refer to Figure 3, shows a high-efficiency ultrasonic metal welding device, including: a bending welding mechanism 1, a longitudinal vibration welding mechanism 2 and a driving mechanism 3; the bending welding mechanism 1 includes a first welding head 11, a first horn assembly 12 and a first transducer 13; the first transducer 13 is coaxially connected to the first horn assembly 12, the first horn assembly 12 is connected to the side of the first welding head 11, and the axis of the first horn assembly 12 is perpendicular to the axis of the first welding head 11; one end of the first welding head 11 has a first welding surface 111, and the first welding surface 111 is aligned with the first The axis of the welding head 11 is vertical; the longitudinal vibration welding mechanism 2 includes a second welding head 21, a second amplitude transformer assembly 22 and a second transducer 23; the second transducer 23 is coaxially connected to the second amplitude transformer assembly 22, and the second amplitude transformer assembly 22 is coaxially connected to the second welding head 21; the side of the second welding head 21 has a second welding surface 211, and the second welding surface 211 is parallel to the axis of the second welding head 21; the second welding surface 211 is arranged opposite to the first welding surface 111; the driving mechanism 3 provides a coaxial driving force for the first welding head 11.

[0040] Among them, the first welding head 11 presses the metal foil onto the second welding head 21 of the longitudinal vibration welding mechanism 2, and the driving mechanism 3 provides the bending welding mechanism 1 with a driving force coaxial with the first welding head 11, that is, the driving force of the driving mechanism 3 is directly transmitted to the first welding head 11, eliminating the welding reaction torque and realizing forceless torsion welding, so that the damage of the first welding head 11 to the metal foil is reduced and the yield rate is improved; the second welding head 21 complements the first welding head 11, and the welding range of the second welding head 21 covers the welding zero point of the first welding head 11, thereby completing the processing in one welding, effectively improving the processing efficiency.

[0041] The above solution is preferred. To improve the welding effect, refer to Figure 3 , the axis of the first horn assembly 12 is perpendicular to the axis of the second horn assembly 22. In this way, the directions in which the first horn assembly 12 and the second horn assembly 22 transmit ultrasonic vibrations are perpendicular, thereby improving the complementary effect. The second welding head 21 is a full-wave welding head. The first welding head 11 operates in a transverse vibration mode, with the vibration direction perpendicular to the axis of the first welding head 11 and a length of half a wavelength or an integer multiple of half a wavelength. The first welding head 11 receives ultrasonic vibration and welding force and applies the ultrasonic vibration and welding force to the workpiece.

[0042] Specifically, the drive mechanism 3 includes a drive cylinder 31, which drives the first welding head 11 to rise and fall. A cylindrical connector 8 is provided at the end of the first welding head 11, and the piston rod of the drive cylinder 31 is detachably connected to the connector 8 via a fixing mechanism 7. The piston rod of the drive cylinder 31 is coaxially arranged with the first welding head 11. In this way, the driving force of the drive cylinder 31 directly acts on the first welding head 11, so that the center axis of the welding pressure corresponds to the axis of the first welding head 11, eliminating the welding reaction torque and achieving force-free torsion welding.

[0043] In addition, in order to improve the installation convenience of the connector 8 and the fixing mechanism 7, refer to Figure 4 , an annular groove 81 is provided on the outer peripheral wall of the connecting head 8; the fixing mechanism 7 includes a base block 71, a buckle groove 711 is opened on the base block 71, and both side walls of the buckle groove 711 are provided with a first clamping strip 712 for clamping into the annular groove 81; a base plate 72 is provided on the base block 71 for blocking one end of the buckle groove 711; a clamping block 73 is provided on the base block 71 for blocking the other end of the buckle groove 711, and a second clamping strip 731 is provided on the clamping block 73 for clamping into the annular groove 81; the base plate 72 and the base block 71 are fixedly connected or detachably connected; the clamping block 73 and the base block 71 are detachably connected. In other words, the upper end of the connector 8 is buckled in the buckle groove 711, and the first clamping strip 712 and the second clamping strip 731 are clamped into the annular clamping groove 81 so that the connector 8 cannot be separated from the buckle groove 711; and the clamping block 73 is fixed to the base block 71 by bolts. When the bolts are tightened, the second clamping strip 731 on the clamping block 73 can squeeze the connector 8, thereby preventing the connector 8 from rotating; wherein, with reference to Figure 5 The base block 71 can be composed of two sub-components, with two first clips 712 located on each sub-component. The two sub-components are fixedly connected by bolts. When the bolts are tightened, one first clip 712 moves closer to the other first clip 712, causing the first clip 712 to squeeze the connector 8, further preventing the connector 8 from rotating. In actual applications, the cylindrical connector 8 can be easily adjusted to the installation direction, thereby facilitating installation. In this embodiment, the piston rod of the drive cylinder 31 is connected to the upper portion of the base block 71, while the buckle groove 711 is located at the bottom of the base block 71.

[0044] Specifically, in order to improve the stability of the first welding head 11 when moving and avoid the welding point from shifting, refer to Figure 2The welding device further includes a base 4, on which a bracket 5 is mounted. The driving cylinder 31 is mounted on the bracket 5, which is provided with a vertical slide rail 51. The fixing mechanism 7 is connected to a slider 52, which slidably engages with the slide rail 51. Thus, under the guidance of the slide rail 51, the first welding head 11 moves stably.

[0045] Specifically, in order to adjust the position of the second welding surface 211, refer to Figure 6 The base 4 is provided with a support base 6, and the longitudinal vibration welding mechanism 2 is provided on the support base 6; the longitudinal vibration welding mechanism 2 is located below the bending welding mechanism 1; the base 4 is provided with a mounting hole 41, and the support base 6 is provided with a slotted hole 61. A bolt is passed through the slotted hole 61 and threadedly connected to the mounting hole 41, thereby securing the support base 6 to the base 4. In this way, the slotted hole 61 has a certain length. When the bolt is loosened, the support base 6 can be moved on the base 4, thereby adjusting the position of the second welding surface 211; when the bolt is tightened, the nut of the bolt presses the support base 6 against the base 4, thereby preventing the support base 6 from moving. There are multiple mounting holes 41 and slotted holes 61. Optionally, the second horn assembly 22 includes two second sub-horns 221, which are symmetrically arranged at both ends of the second welding head 21; the second transducer 23 is connected to one of the second sub-horns 221.

[0046] In some specific embodiments, for different application scenarios, two structures of the first horn assembly 12 are improved, one of which can refer to Figure 7 The first horn assembly 12 includes two first sub-horns 121, which are symmetrically arranged on either side of the first welding head 11. The first transducer 13 is connected to one of the first sub-horns 121. The two first sub-horns 121 are evenly arranged on either side of the first welding head 11. The first sub-horns 121 farther from the first transducer 13 generate echoes, improving the balance of the first welding head 11 and the welding effect.

[0047] Another reference Figure 8 The first horn assembly 12 includes a first sub-horn 121, one end of which is connected to the side of the first welding head 11, and the other end is connected to the first transducer 13. In this way, the length of the bending welding mechanism 1 can be reduced to avoid interference with other equipment on the processing site.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-efficiency ultrasonic metal welding device, characterized in that: include: A bending welding mechanism comprising a first welding head, a first horn assembly and a first transducer; The first transducer is coaxially connected to the first horn assembly, the first horn assembly is connected to a side of the first welding head, and the axis of the first horn assembly is perpendicular to the axis of the first welding head; one end of the first welding head has a first welding surface, and the first welding surface is perpendicular to the axis of the first welding head; A longitudinal vibration welding mechanism includes a second welding head, a second horn assembly, and a second transducer; the second transducer is coaxially connected to the second horn assembly, and the second horn assembly is coaxially connected to the second welding head; the side of the second welding head has a second welding surface, the second welding surface is parallel to the axis of the second welding head; the second welding surface is arranged to face the first welding surface; a driving mechanism for providing a coaxial driving force to the first welding head; The axis of the first horn assembly is perpendicular to the axis of the second horn assembly; The second welding head is a full-wave welding head, the vibration direction of the first welding head is perpendicular to its own axis, and the wavelength length is half a wavelength or an integer multiple of half a wavelength; The driving mechanism includes a driving cylinder, a cylindrical connector is provided at the end of the first welding head, and a piston rod of the driving cylinder is detachably connected to the connector via a fixing mechanism; the piston rod of the driving cylinder is coaxially arranged with the first welding head; An annular groove is provided on the outer peripheral wall of the connecting head; the fixing mechanism includes a base block, a buckle groove is provided on the base block, and both side walls of the buckle groove are provided with a first clamping strip for clamping into the annular groove; a base plate is provided on the base block for blocking one end of the buckle groove; a clamping block is provided on the base block for blocking the other end of the buckle groove, and a second clamping strip is provided on the clamping block for clamping into the annular groove; the base plate and the base block are fixedly connected as a whole or detachably connected; the clamping block and the base block are detachably connected.

2. The high-efficiency ultrasonic metal welding device according to claim 1, characterized in that: The welding device also includes a base, on which a bracket is provided; the driving cylinder is arranged on the bracket, on which a vertically arranged slide rail is provided; the fixing mechanism is connected to a slider, and the slider is slidably matched with the slide rail.

3. The high-efficiency ultrasonic metal welding device according to claim 2, characterized in that: A support seat is provided on the base, and the longitudinal vibration welding mechanism is provided on the support seat; the longitudinal vibration welding mechanism is located below the bending welding mechanism; a mounting hole is provided on the base, and a slot hole is provided on the support seat, and a bolt is passed through the slot hole, and the bolt is threadedly connected to the mounting hole, thereby fixing the support seat on the base.

4. The high-efficiency ultrasonic metal welding device according to claim 1, characterized in that: The first horn assembly includes two first sub-horns, which are symmetrically arranged on both sides of the first welding head; the first transducer is connected to one of the first sub-horns.

5. The high-efficiency ultrasonic metal welding device according to claim 1, characterized in that: The first horn assembly includes a first sub-horn, one end of which is connected to the side of the first welding head, and the other end of which is connected to the first transducer.

6. The high-efficiency ultrasonic metal welding device according to claim 1, characterized in that: The second horn assembly includes two second sub-horns, which are symmetrically arranged at two ends of the second welding head; the second transducer is connected to one of the second sub-horns.

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