Ultrasonic welding device

Abstract

The utility model relates to an ultrasonic welding device which comprises a rack, a linear module, a driving frame, a driver, a fixing frame and a spot bottom welding ultrasonic tool head. The driving frame is installed on the linear module, the linear module is installed on the rack, the linear module is in transmission connection with the driving frame so as to drive the driving frame to move up and down along the rack and adjust the height of the working position of the spot bottom welding ultrasonic tool head, and the spot bottom welding ultrasonic tool head comprises a fixing base, a welding needle, an amplitude modulation rod and a connecting piece; the fixing seat is provided with a fixing hole and an open groove, the fixing hole is communicated with the open groove, and two opposite groove walls of the open groove are provided with connecting holes vertically penetrating through the two groove walls; the welding pin is provided with a fixed end and a welding end which are opposite, the fixed end is used for being embedded in the fixed hole, and the welding end is used for stretching into a welding workpiece to implement spot bottom welding; and the connecting piece is used for penetrating through the connecting hole and is locked with the amplitude modulation rod, so that the aperture of the fixing hole is reduced by reducing the width of the open slot, and the fixed end of the welding pin is locked with the fixed seat. The welding device is more uniform in welding, and the welding needle is convenient to replace.

Description

TECHNICAL FIELD

[0001] The utility model relates to ultrasonic welding technical field especially relates to a kind of point bottom welding ultrasonic tool head and ultrasonic welding device. BACKGROUND

[0002] At present, ultrasonic welding technology has been widely used in various industries. Among them, in the new energy manufacturing industry related to lithium batteries, various lithium batteries with different structures and different purposes need to be manufactured, so the welding of battery cells during the manufacturing of lithium batteries also needs to use ultrasonic tool heads with corresponding shapes and wavelengths to adapt to the welding needs of different battery cells.

[0003] For the welding of battery cells in lithium batteries, such as cylindrical cell point bottom welding, the ultrasonic tool head needs to be inserted into the bottom of the battery cell from the center hole of the battery cell for welding. The commonly used cylindrical cell point bottom welding on the market uses composite vibration ultrasonic torque welding, and its welding principle is that the center axis of the ultrasonic tool head is the rotation center axis, and the welding end face of the ultrasonic tool head reciprocally twists and rubs with the bottom of the battery cell to perform welding. Its disadvantage is that the closer to the center axis, the weaker the ultrasonic energy, and vice versa, the farther away from the center axis, the stronger the energy, resulting in uneven welding and not meeting the full welding requirements. SUMMARY

[0004] Compared with the prior art, the purpose of the utility model is at least to provide a point bottom welding ultrasonic tool head that welds more uniformly, and simultaneously to provide an ultrasonic welding device that welds more uniformly.

[0005] The point bottom welding ultrasonic tool head provided by the utility model comprises a fixing seat, a welding needle, an amplitude modulation rod and a connecting piece. The fixing seat has a fixing hole and a slot. The fixing hole is in communication with the slot. Opposite two slot walls of the slot are provided with a connecting hole that penetrates through the two slot walls vertically.

[0006] The welding needle has opposite fixed ends and welding ends. The fixed ends are used to be embedded in the fixing hole. The welding ends are used to extend into the inside of the welding workpiece to implement point bottom welding.

[0007] The connecting piece is used to pass through the connecting hole and lock with the amplitude modulation rod, so as to reduce the width of the slot, reduce the aperture of the fixing hole, and lock the fixed end of the welding needle with the fixing seat.

[0008] Compared with the composite vibration ultrasonic torque welding adopted in the prior art, the utility model adopts the structural design of the bending vibration welding, namely, the vibration mode is the axial vibration along the welding needle, and the welding end of the welding needle is away from the vibration source, makes the axial vibration evolve into the bending vibration, and the welding uneven problem caused by the fact that the closer to the central axis, the weaker the ultrasonic energy, and the farther from the central axis, the stronger the energy does not appear, so that the welding effect is more uniform, can satisfy full welding demand.

[0009] In addition, the utility model is easier to replace the welding needle. Specifically, different specifications of welding needles need to be replaced for different types of welding workpieces, and the welding needle also needs to be replaced in time as a kind of consumable for the same type of welding workpiece;The utility model only needs to detach the amplitude modulation rod from the connecting piece, the width of the slot and the aperture of the fixing hole can be restored, so that the connecting piece and the welding needle can be easily taken out from the fixed seat, and the utility model is convenient and fast to disassemble.

[0010] Preferably, the fixed end of the welding needle is provided with a boss, and the boss is nested with the fixing hole. By providing the boss, the fixed end of the welding needle is more convenient to nest with the fixing hole.

[0011] Preferably, the welding end of the welding needle is provided with a thread pattern matched with the welding workpiece. Therefore, the welding needle with the corresponding shape and size of the thread pattern can be selected for different welding workpieces.

[0012] Preferably, the length of the welding needle is greater than 1 / 4 of the wavelength of the ultrasonic wave matched with the welding needle. Thus, the bending vibration of welding can be more uniform.

[0013] Preferably, the utility model further comprises a transducer connected between the ultrasonic generator and the amplitude modulation rod. The transducer converts the ultrasonic energy from the ultrasonic generator into vibration energy, and then the amplitude modulation rod amplifies the amplitude, and finally the welding needle transmits the vibration energy to the welding workpiece to realize the welding of the welding workpiece.

[0014] Preferably, the welding workpiece is a cylindrical battery. The spot butt welding ultrasonic tool head of the utility model is applied to the welding of the cylindrical battery, and the effect is more prominent.

[0015] The utility model discloses a kind of ultrasonic welding devices, including rack, drive frame, driver, fixed frame and the spot butt welding ultrasonic tool head as any one of the above scheme;The drive frame is installed on the rack, and the driver and the fixed frame are installed on the drive frame;The fixed seat is installed on the fixed frame, and the driver is sequentially connected with the welding needle by the fixed frame, the fixed seat forms transmission.

[0016] Based on the advantages of the point bottom welding ultrasonic tool head, the ultrasonic welding device provided by the utility model is more uniform in welding and can meet the full welding requirement.

[0017] Preferably, the device further comprises a lifting frame and a buffer, the lifting frame is slidingly installed on the driving frame, the output end of the driver is in transmission connection with the lifting frame, the fixed frame is slidingly installed on the lifting frame, the buffer is installed on the lifting frame and the output end of the buffer is in transmission connection with the fixed frame, so as to slow down the transmission between the lifting frame and the fixed frame.

[0018] Preferably, the device further comprises a linear module, the linear module is installed on the rack, the driving frame is installed on the linear module, and the linear module is in transmission connection with the driving frame, so as to drive the driving frame to move along the rack. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 is a plane structure schematic view of the point bottom welding ultrasonic tool head provided by the embodiment.

[0021] Figure 2 is a three-dimensional structure schematic view of the point bottom welding ultrasonic tool head provided by the embodiment.

[0022] Figure 3 is a plane structure schematic view of the ultrasonic welding device provided by the embodiment. Figure 2 is a corresponding exploded structure schematic view.

[0023] Figure 4 is a plane structure schematic view of the ultrasonic welding device provided by the embodiment.

[0024] Figure 5 is a corresponding right view structure schematic view. Figure 4

[0025] Figure 6 is a three-dimensional structure schematic view of the ultrasonic welding device provided by the embodiment.

[0026] The drawings show that: 11 is a fixed seat, 12 is a welding needle, 13 is an amplitude modulation rod, 14 is a connecting piece, 15 is a slotted groove, 16 is a connecting hole, 17 is a boss, 18 is a transducer, 20 is a rack, 21 is a driving frame, 22 is a driver, 23 is a fixed frame, 24 is a buffer, 25 is a linear module, 26 is a lifting frame, and 30 is a cylindrical battery.​ Detailed Implementation

[0027] To make the invention's objectives, features, and advantages more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this application, it should be noted that the terms "upper", "lower", "front", "rear", "side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Unless otherwise expressly specified and limited, the terms "connection," "fixed," and "set" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Please refer to the following: Figures 1 to 3 The ultrasonic tool head for spot welding provided in this embodiment includes a fixed base 11, a welding needle 12, an amplitude adjustment rod 13, and a connector 14. The fixed base 11 has a fixing hole (not shown in the figure) and a slot 15. The fixing hole is connected to the slot 15. The two opposite slot walls of the slot 15 are provided with connecting holes 16 that penetrate the two slot walls vertically.

[0031] The welding pin 12 has a fixed end and a welding end, the fixed end being used to be embedded in a fixing hole, and the welding end being used to extend into the workpiece to be welded (e.g., Figures 4 to 6 The cylindrical battery cell 30 is subjected to spot welding inside.

[0032] The connector 14 is used to pass through the connecting hole 16 and lock with the amplitude adjustment rod 13 so as to reduce the diameter of the fixing hole by reducing the width of the slot 15, thereby locking the fixed end of the welding needle 12 with the fixing seat 11.

[0033] Compared to the composite vibration ultrasonic torque welding used in existing technologies, this embodiment employs a bending vibration welding structural design. Specifically, the vibration mode is axial vibration along the welding needle 12, and the welding end of the welding needle 12 is far from the vibration source, transforming the axial vibration into bending vibration. This avoids the problem of uneven welding caused by the ultrasonic energy decreasing closer to the central axis and increasing further away from the central axis. Therefore, the welding effect of this embodiment is more uniform and can meet the requirements for full welding.

[0034] Furthermore, this embodiment makes it easier to replace the welding needle 12. Specifically, different specifications of welding needles 12 are required for different types of welding workpieces; and for the same type of welding workpiece, the welding needle 12, as a consumable, also needs to be replaced promptly. In this embodiment, simply removing the amplitude adjustment rod 13 from the connector 14 restores the width of the slot 15 and the diameter of the fixing hole, thereby easily removing the connector 14 and the welding needle 12 from the fixing base 11. Disassembly is convenient and quick. Moreover, since only the welding needle 12 needs to be replaced, without replacing the entire tool head, materials can be greatly saved and production costs reduced.

[0035] As a preferred embodiment, the fixed end of the welding needle 12 is provided with a boss 17, which is adapted to and nested with the fixing hole. By providing this boss 17, it is easier to nest and fit the fixed end of the welding needle 12 with the fixing hole.

[0036] As a preferred embodiment, the welding end of the welding needle 12 is provided with teeth (not shown) that are adapted to the workpiece being welded. Therefore, welding needles with teeth of appropriate shape and size can be selected for different workpieces being welded.

[0037] Preferably, the length of the welding needle is greater than 1 / 4 of the wavelength of the ultrasonic wave it is adapted to. This allows for more uniform bending vibration during welding.

[0038] As a preferred embodiment, it also includes a transducer 18 (such as...) Figures 4 to 6 As shown in the figure, the transducer 18 is used to connect between the ultrasonic generator (not shown) and the amplitude modulator 13. The transducer 18 converts the ultrasonic energy from the ultrasonic generator into vibration energy, which is then amplified by the amplitude modulator 13. Finally, the welding needle 12 transmits the vibration energy to the workpiece to achieve welding.

[0039] The ultrasonic tool head for spot welding in this embodiment is applied to the welding of cylindrical battery cells, and its effect is even more outstanding.

[0040] Please refer to the following: Figures 4 to 6The embodiment correspondingly provides an ultrasonic welding device, which comprises a rack 20, a driving frame 21, a driver 22, a fixing frame 23 and the point bottom welding ultrasonic tool head according to any one of the above solutions; the driving frame 21 is installed on the rack 20, the driver 22 and the fixing frame 23 are installed on the driving frame 21; the fixing seat 11 is installed on the fixing frame 23, and the driver 22 is in driving connection with the welding needle 12 through the fixing frame 23 and the fixing seat 11 in sequence.

[0041] In the embodiment, the driver 22 can be a driving cylinder, the driving frame 21 can be provided with a guide rail, and the fixing frame 23 is installed on the guide rail of the driving frame 21, so that the driving cylinder can drive the fixing frame 23 to reciprocate up and down. That is, when the welding workpiece needs to be welded, the driving cylinder drives the fixing frame 23 to move downward, so that the fixing frame 23 drives the welding needle 12 to move downward and contact the welding workpiece through the fixing seat 11; after the welding is completed, the driving cylinder drives the fixing frame 23 to move upward, so that the fixing frame 23 drives the welding needle 12 to move upward and away from the welding workpiece through the fixing seat 11.

[0042] Based on the advantages of the point bottom welding ultrasonic tool head, the ultrasonic welding device provided by the embodiment can weld more uniformly and meet the full welding requirement.

[0043] As a preferred solution, the ultrasonic welding device further comprises a lifting frame 26 and a buffer 24, the lifting frame 26 is slidingly installed on the driving frame 21, the output end of the driver 22 is in driving connection with the lifting frame 26, the fixing frame 23 is slidingly installed on the lifting frame 26, and the buffer 24 is installed on the lifting frame 26 and the output end of the buffer 24 is in driving connection with the fixing frame 23, so as to slow down the transmission between the lifting frame 26 and the fixing frame 23. In this way, the output of the driver 22 drives the welding needle 12 through the lifting frame 26, the fixing frame 23 and the fixing seat 11 in sequence, and the buffer 24 can make the transmission to the welding needle 12 more stable. The buffer 24 can be a buffer cylinder

[0044] As a preferred solution, the ultrasonic welding device further comprises a linear module 25, the linear module 25 is installed on the rack 20, the driving frame 21 is installed on the linear module 25, and the linear module 25 is in driving connection with the driving frame 21, specifically, the driving frame 21 can be fixed on the slider of the linear module, so as to drive the driving frame 21 to move up and down along the rack 20. Therefore, before the welding workpiece is welded, the height of the working position of the point bottom welding ultrasonic tool head can be adjusted according to the height of different welding workpieces through the height of the driving frame 21, so that the point bottom welding ultrasonic tool head can adapt to welding workpieces with different heights.

[0045] The above-described above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An ultrasonic welding device characterized by comprising: The device comprises a rack, a linear module, a driving frame, a driver, a fixing frame and a spot bottom welding ultrasonic tool head; the driving frame is installed on the linear module, the linear module is installed on the rack, and the linear module is in transmission connection with the driving frame to drive the driving frame to move up and down along the rack to adjust the height of the working position of the spot bottom welding ultrasonic tool head; the driver and the fixing frame are installed on the driving frame; The spot bottom welding ultrasonic tool head comprises a fixing seat, a welding needle, an amplitude modulation rod and a connecting piece; the fixing seat is provided with a fixing hole and a slot, the fixing hole is in communication with the slot, and opposite two slot walls of the slot are provided with connecting holes vertically penetrating through the two slot walls; The welding needle is provided with opposite fixing ends and welding ends, the fixing ends are used for being embedded in the fixing hole, and the welding ends are used for extending into the inside of a welding workpiece to implement spot bottom welding; The connecting piece is used for penetrating through the connecting holes and locking with the amplitude modulation rod to reduce the width of the slot, reduce the aperture of the fixing hole, and lock the fixing ends of the welding needle with the fixing seat; The length of the welding needle is greater than 1 / 4 of the wavelength of the ultrasonic wave adapted to the welding needle; the fixing seat is installed on the fixing frame, and the driver is in transmission connection with the fixing seat and the welding needle through the fixing frame and the fixing seat in sequence.

2. The ultrasonic welding device of claim 1, wherein, The fixing end of the welding needle is provided with a boss which is nested with the fixing hole.

3. The ultrasonic welding device of claim 1, wherein, The welding end of the welding needle is provided with a thread which is adapted to the welding workpiece.

4. The ultrasonic welding device of claim 1, wherein, The spot bottom welding ultrasonic tool head further comprises a transducer which is used for being connected between an ultrasonic wave generator and the amplitude modulation rod.

5. The ultrasonic welding device of any one of claims 1-4, wherein, The welding workpiece is a cylindrical battery cell.

6. The ultrasonic welding device of claim 1, wherein, The device further comprises a lifting frame and a buffer; the lifting frame is slidingly installed on the driving frame, the output end of the driver is in transmission connection with the lifting frame, the fixing frame is slidingly installed on the lifting frame, and the buffer is installed on the lifting frame and the output end of the buffer is in transmission connection with the fixing frame to slow down the transmission between the lifting frame and the fixing frame.

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