Node type wedge rod welding head and ultrasonic welding assembly

Abstract

The utility model belongs to the technical field of ultrasonic welding, and particularly relates to a node type wedge rod welding head and an ultrasonic welding assembly, the wedge rod welding head comprises an acoustic body, a vibration attenuation rod and a mass block, the acoustic body is in a half-wave vibration mode under resonant frequency, the vibration mode comprises at least one sound wave node, and the mass block is arranged on the acoustic body. The position of the sound wave node is connected with at least one vibration attenuation rod, and the vibration attenuation rod is connected with the mass block; a welding part is arranged at the end part of the acoustic body; the acoustic body, the vibration attenuation rod and the mass block are configured to be an integrally-formed piece. According to the welding fixture, stable and large welding pressure can be provided, vibration in the clamping direction can be attenuated, tilting of a welding part is avoided, welding stability is guaranteed, and production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic welding, and in particular relates to a node-type wedge rod welding head and an ultrasonic welding component. Background Art

[0002] The working principle of ultrasonic metal welding machine is to use transducer to convert electrical energy into high-frequency mechanical vibration energy. Under pressure, two metal sheets to be welded (ear tab foil) are clamped between the welding head and the bottom mold. After the high-frequency vibration wave is transmitted to the surface of the upper metal sheet along the welding head, the welding head drives the upper metal sheet to vibrate at high frequency, and the bottom mold fixes the lower metal sheet, thereby generating high-frequency friction between the two metal sheets. The molecules at the junction of the metal sheets penetrate each other and combine together to form a tight connection.

[0003] At present, the PACK battery module is welded by using a conventional welding head structure. For the welding of the PACK battery module tabs and connecting plates, if the welded material is thick or multiple tabs are welded together, a larger welding pressure and amplitude are required. On the one hand, the existing welding head structure uses a conventional spring sheet structure welding head. Please refer to the patent document with publication number CN109352166A. Because the welding head deforms greatly when subjected to high pressure, the welding head tilts more and the weld mark is irregularly deformed, which affects the stability of the welding and is prone to heat or battery explosion, posing a safety hazard. On the other hand, the existing wedge rod welding head structure cannot be welded in a special narrow space, and the application scenarios are limited.

[0004] Based on this, it is necessary to improve the defects of the prior art to overcome the shortcomings in practical applications. Utility Model Content

[0005] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the purposes of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the purposes of the present invention is to provide a node-type wedge rod welding head and ultrasonic welding assembly that meets one or more of the above-mentioned needs.

[0006] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a node-type wedge rod welding head, comprising an acoustic body, a vibration attenuation rod and a mass block, wherein the acoustic body is a half-wave vibration mode at a resonant frequency, and the vibration mode includes at least one acoustic wave node, the position of the acoustic wave node is connected to at least one vibration attenuation rod, and the vibration attenuation rod is connected to the mass block; a welding portion is provided at the end of the acoustic body; wherein the acoustic body, the vibration attenuation rod and the mass block are configured as an integrally formed part.

[0008] As a preferred solution, the acoustic body is connected to two vibration attenuation rods, and the two vibration attenuation rods are symmetrically arranged relative to the position of the same acoustic wave node of the acoustic body.

[0009] As a preferred solution, the two vibration attenuation rods are respectively connected to mass blocks, and the mass blocks are configured as clamping parts.

[0010] As a preferred solution, the welding portion is arranged at the antinode position in the vibration mode of the acoustic body.

[0011] As a preferred solution, two welding portions are provided, and the two welding portions are symmetrically arranged relative to the extension direction of the acoustic body.

[0012] As a preferred solution, the vibration direction of the acoustic body is along its extension direction, and the vibration direction of the vibration attenuation rod is perpendicular to the vibration direction of the acoustic body.

[0013] As a preferred solution, the length of the acoustic body is set to an integer multiple of a half wavelength and includes at least one acoustic wave node.

[0014] As a preferred solution, a wrench hole is provided on the acoustic body.

[0015] The utility model also provides an ultrasonic welding assembly, comprising a wedge rod welding head and an ultrasonic vibration source as described in any of the above schemes, wherein the wedge rod welding head is connected to the ultrasonic vibration source.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides a node-type wedge rod welding head, which arranges a vibration attenuation rod and a mass block at the acoustic node position of an acoustic body, and arranges a welding part at the end of the acoustic body, thereby providing a stable and large welding pressure, ensuring the ultrasonic vibration of the acoustic body along its extension direction, and attenuating the vibration in the clamping direction by clamping and fixing the mass block, thereby avoiding warping of the end of the acoustic body, ensuring stability during welding, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the node-type wedge rod welding head structure of an embodiment of the utility model;

[0020] Figure 2yes Figure 1 Schematic diagram of vibration modes in ;

[0021] Figure 3 It is another structural schematic diagram of the node-type wedge rod welding head of the embodiment of the utility model;

[0022] Figure 4 yes Figure 3 Schematic diagram of vibration modes in ;

[0023] Figure 5 It is a schematic diagram of a node-type wedge rod welding head, a bottom mold and a battery module according to an embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram of a node-type wedge rod welding head welding a battery module according to an embodiment of the utility model;

[0025] In the figure: 1, acoustic body, 11 wrench hole, 2 vibration attenuation rod, 3 mass block, 4 welding part, 5 bottom mold, 6 battery module, P sound wave node, S vibration mode. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present application, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0027] In the description of the embodiments of the present application, terms such as "upper", "lower", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply 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 application.

[0028] According to some embodiments of the present application, Figures 1 to 4 As shown, a node-type wedge rod welding head is provided, including an acoustic body 1, a vibration attenuation rod 2 and a mass block 3. The acoustic body 1 is a half-wave vibration mode at the resonant frequency, and the vibration mode includes at least one acoustic wave node P. The position of the acoustic wave node P is connected to at least one vibration attenuation rod 2, and the vibration attenuation rod 2 is connected to the mass block 3. A welding portion 4 is provided at the end of the acoustic body 1. Among them, the acoustic body 1, the vibration attenuation rod 2 and the mass block 3 are configured as an integrally formed part.

[0029] In some specific embodiments, the acoustic body 1, the vibration attenuation rod 2 and the mass block 3 are manufactured into an integrally formed part through an integrated molding process. The one-piece structure is formed from the same blank or raw material through an integrated molding process including but not limited to machining, casting or additive manufacturing. This can reduce the phenomenon of decreased welding quality due to assembly quality or damage to components during the assembly process that may occur in the later assembly process.

[0030] In some specific embodiments, the length of the acoustic body 1 is set to an integer multiple of a half wavelength and includes at least one acoustic node P, and the welding portion 4 is set at the antinode position in the vibration mode S of the acoustic body 1 .

[0031] Specifically, Figure 2 and Figure 4 As shown in the vibration mode S in the figure, the acoustic body 1 transmits the vibration of the ultrasonic vibration source to the welding part 4 along the length direction. When the length of the acoustic body 1 is an integer multiple of half the wavelength and contains an acoustic wave node P, the welding part 4 is located at the antinode position of the vibration mode S of the acoustic body 1, which can fully excite the vibration of the acoustic body 1, so that the end of the acoustic body 1, that is, the welding part 4 is the position with the largest amplitude, and the energy generated by the ultrasonic vibration can be effectively output to the workpiece to be welded.

[0032] Furthermore, two welding parts 4 are provided, and the two welding parts 4 are symmetrically arranged relative to the extension direction of the acoustic body 1, so as to realize double-sided welding. When one of the welding parts is worn, the welding part 4 can be replaced by simply rotating the acoustic body 1 180 degrees, which is convenient to operate and reduces the cost of use.

[0033] In some specific embodiments, Figure 1 to Figure 2 As shown, one side of the acoustic body 1 is connected to a vibration attenuation rod 2, and the vibration attenuation rod 2 is connected to a mass block 3. The vibration attenuation rod 2 is arranged at the position of the acoustic wave node P of the acoustic body 1, and can attenuate the ultrasonic vibration of the acoustic body 1 to ensure the structural rigidity.

[0034] In some specific embodiments, Figure 3 to Figure 4 As shown, the acoustic body 1 is connected to two vibration attenuation rods 2, and the two vibration attenuation rods 2 are symmetrically arranged relative to the position of the same acoustic wave node P of the acoustic body 1. The vibration attenuation rods 2 can attenuate the ultrasonic vibration of the acoustic body 1 to ensure structural rigidity.

[0035] Furthermore, the two vibration attenuation rods 2 are respectively connected to the mass block 3, and the mass block 3 is configured as a clamping part. The clamping force direction is perpendicular to the acoustic body 1 and passes through the acoustic wave node P, which can ensure the ultrasonic vibration of the acoustic body 1 along its extension direction. The vibration in the clamping direction is attenuated by clamping and fixing the mass block 3, which avoids warping of the end of the acoustic body 1, ensures stability during welding, and improves production efficiency.

[0036] Furthermore, if Figure 2 and Figure 4 As shown, the vibration direction of the acoustic body 1 is along its extension direction, as shown by Z in the up and down direction, and the vibration direction of the vibration attenuation rod 2 is along its extension direction, as shown by Z in the left and right direction. The vibration direction of the vibration attenuation rod 2 is perpendicular to the vibration direction of the acoustic body 1.

[0037] When one end of the acoustic body 1 is connected to the ultrasonic vibration source, the other end of the acoustic body 1 is provided with a welding portion and is at a position with maximum amplitude, so the welding portion 4 can be effectively excited to ensure the amplitude during welding and improve energy transfer efficiency.

[0038] Furthermore, a wrench hole 11 is provided on the acoustic body 1 , and a crescent wrench or other tools can be inserted into the wrench hole 11 to apply torque to the acoustic body 1 to achieve installation or removal of the acoustic body 1 .

[0039] According to some embodiments of the present application, an ultrasonic welding assembly is also provided, comprising the wedge rod welding head and an ultrasonic vibration source as described above, wherein the wedge rod welding head is connected to the ultrasonic vibration source (not shown in the figure). The ultrasonic vibration is transmitted to the acoustic body through the ultrasonic vibration source, and the high-frequency vibration of the acoustic body drives the welding part and the workpiece to be welded to achieve high-frequency friction to achieve welding.

[0040] Furthermore, if Figures 5 and 6 As shown, the bottom mold 5 and the welding part 4 are arranged opposite to each other, and the workpiece to be welded is installed between the bottom mold 5 and the welding part 4 to realize ultrasonic welding of the workpiece to be welded.

[0041] Specifically, the bottom mold 5 is configured as a special-shaped structure, the upper end of the bottom mold 5 abuts against the lower surface of the tab of the PACK battery module 6, and the welding portion 4 is crimped on the upper surface of the tab. Since the PACK battery module is arranged in 6 layers, the tabs of different layers can be welded by adjusting the position of the bottom mold 5 and the welding portion 4 to meet the application scenario of welding in a special narrow space.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] The above description is only a detailed description of the preferred embodiments and principles of the present application. For ordinary technicians in this field, there will be changes in the specific implementation methods based on the ideas provided by the present application, and these changes should also be regarded as the scope of protection of the present application.

Claims

1. A node-type wedge rod welding head, characterized in that: It includes an acoustic body, a vibration attenuation rod and a mass block, wherein the acoustic body is in a half-wave vibration mode at a resonant frequency, and the vibration mode includes at least one acoustic wave node, the position of the acoustic wave node is connected to at least one vibration attenuation rod, and the vibration attenuation rod is connected to the mass block; a welding portion is provided at the end of the acoustic body; wherein the acoustic body, the vibration attenuation rod and the mass block are configured as an integrally formed part.

2. A node-type wedge rod welding head according to claim 1, characterized in that: The acoustic body is connected to two vibration attenuation rods, and the two vibration attenuation rods are symmetrically arranged relative to the position of the same acoustic wave node of the acoustic body.

3. A node-type wedge rod welding head according to claim 2, characterized in that: The two vibration attenuation rods are respectively connected to mass blocks, and the mass blocks are configured as clamping parts.

4. A node-type wedge rod welding head according to claim 1, characterized in that: The welding portion is arranged at an antinode position in a vibration mode of the acoustic body.

5. A node-type wedge rod welding head according to claim 4, characterized in that: There are two welding parts, and the two welding parts are symmetrically arranged relative to the extension direction of the acoustic body.

6. A node-type wedge rod welding head according to claim 1, characterized in that: The vibration direction of the acoustic body is along its extension direction, and the vibration direction of the vibration attenuation rod is perpendicular to the vibration direction of the acoustic body.

7. A node-type wedge rod welding head according to claim 1, characterized in that: The length of the acoustic body is set to an integral multiple of a half wavelength and includes at least one acoustic wave node.

8. A node-type wedge rod welding head according to claim 1, characterized in that: The acoustic body is provided with a wrench hole.

9. An ultrasonic welding assembly, characterized in that: It comprises a wedge rod welding head as described in any one of claims 1 to 8 and an ultrasonic vibration source, wherein the wedge rod welding head is connected to the ultrasonic vibration source.

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