Welding head structure and ultrasonic welding system

Abstract

The utility model discloses a welding head structure and an ultrasonic welding system. The welding head structure comprises a welding head body, the welding head body is provided with a negative pressure face and a welding face suitable for making contact with a to-be-welded piece, the negative pressure face is sunken relative to the welding face so as to be away from the to-be-welded piece, a negative pressure channel is formed in the welding head body, one end of the negative pressure channel penetrates to the negative pressure face, and the other end of the negative pressure channel is connected with a negative pressure source. According to the welding head structure, the negative pressure channel is formed in the welding head body, so that particle dust and welding heat in the welding area can be absorbed, the welding area is clean, the temperature of the welding area is not too high, and therefore it is guaranteed that the welding effect is good.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic welding, and more particularly, to a welding head structure and an ultrasonic welding system. Background Art

[0002] Ultrasonic welding technology is a technique that uses high-frequency vibration to generate heat for welding workpieces to be welded. In traditional fusion welding, the workpieces to be welded are heated above the melting point, then melted and flow at the weld. Ultrasonic welding technology eliminates the oxide scale and dirt on the material surface through high-frequency vibration and directly welds the two workpieces to be welded together. Taking two metal workpieces to be welded as an example, during the ultrasonic welding process, particles such as carbides and oxides will separate from the metal surface due to the effect of high-frequency vibration and float in the welding area with the airflow, forming dust or flying small particles.

[0003] For example, in the welding process of the battery tab, the external tab (or called Tab tab) and the foil tab transfer high-frequency vibration waves to the tab surface through ultrasonic waves. Under the condition of applying pressure, the external tab and the foil tab rub against each other to form a fusion between the molecular layers. Fine particle dust (copper and aluminum powder) will be generated during the welding process. If not processed in time, it will affect the product quality (such as the battery is prone to short circuit) and pollute the workshop environment.

[0004] Therefore, there is room for improvement. Summary of the Utility Model

[0005] The present application aims to at least partly solve one of the above technical problems in the prior art. For this reason, the present application provides a welding head structure that can absorb the particulate dust in the welding area.

[0006] The present application also provides an ultrasonic welding system with the above welding head structure.

[0007] The welding head structure according to the embodiment of the present application includes a welding head body. The welding head body has a negative pressure surface and a welding surface adapted to contact the workpiece to be welded. The negative pressure surface is recessed relative to the welding surface to be away from the workpiece to be welded. A negative pressure channel is provided inside the welding head body. One end of the negative pressure channel penetrates to the negative pressure surface, and the other end of the negative pressure channel is connected to a negative pressure source.

[0008] According to the welding head structure of the embodiment of the present application, by providing a negative pressure channel inside the welding head body, it can absorb the particulate dust and welding heat in the welding area, making the welding area relatively clean and the temperature in the welding area not too high, so as to ensure better welding effect.

[0009] According to some embodiments of the present application, the negative pressure surface and the welding surface are located at the same end of the welding head body.

[0010] According to some embodiments of the present application, one end of the negative pressure channel penetrates to the negative pressure surface to form negative pressure holes on the negative pressure surface, and the negative pressure holes are one or more combinations of circular holes, oval holes, triangular holes, conical holes, and kidney-shaped holes.

[0011] According to some embodiments of the present application, the negative pressure surface is disposed on at least one side of the welding surface.

[0012] According to some embodiments of the present application, the negative pressure surface is disposed around the outer periphery of the welding surface.

[0013] According to some embodiments of the present application, the negative pressure surface is a flat surface.

[0014] According to some embodiments of the present application, the number of the negative pressure channels is one or more.

[0015] According to some embodiments of the present application, the negative pressure source includes a negative pressure pipe, and the negative pressure pipe is connected to the welding head body and communicated with the other end of the negative pressure channel.

[0016] According to some embodiments of the present application, welding teeth are provided on the welding surface, and the welding teeth are adapted to contact the workpiece to be welded.

[0017] According to another embodiment of the present application, an ultrasonic welding system includes a first base, a second base, a welding head driving device, and the above-mentioned welding head structure. The first base is used to fix a first workpiece to be welded, and the second base is used to fix a second workpiece to be welded. One of the first base and the second base can move closer to or away from the other. The welding head driving device is used to drive the welding head structure to move so that the welding surface contacts one of the first workpiece to be welded and the second workpiece to be welded, and the negative pressure surface is adapted to be disposed opposite to and separated from the contacted one.

[0018] According to the ultrasonic welding system of the embodiment of the present application, the welding head structure can absorb particulate dust and welding heat in the welding area by providing a negative pressure channel in the welding head body, so that the welding area is relatively clean and the temperature of the welding area does not become too high, thereby ensuring better welding effect.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0020] Figure 1 is a schematic diagram of a welding head structure according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of a welding head structure according to another embodiment of the present application;

[0022] Figure 3 Schematic diagram of the welding head structure according to another embodiment of the present application;

[0023] Figure 4 It includes Figure 1 Partial schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0024] Figure 5 It includes Figure 2 Partial schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0025] Figure 6 It includes Figure 2 Three-dimensional schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0026] Figure 7 It includes Figure 2 Another three-dimensional schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0027] Figure 8 It includes Figure 3 Partial schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0028] Figure 9 It includes Figure 3 Three-dimensional schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0029] Figure 10 It includes Figure 3 Another three-dimensional schematic diagram of the ultrasonic welding system of the welding head structure shown in the embodiment;

[0030] Figure 11 Schematic diagram of the position of the battery cell on the second base;

[0031] Figure 12 Schematic diagram of the position of the external tab on the tab shaping seat;

[0032] Figure 13 Schematic diagram of the tab clamp clamping the external tab.

[0033] Reference numerals:

[0034] Ultrasonic welding system 100, welding head structure 10, welding head body 1, negative pressure surface 11, negative pressure holes 111, welding surface 12, welding teeth 121, negative pressure tube 2, plug 21, welding head driving device 20, first base 30, second base 40, external tab 50, sealant 501, battery cell 60, foil tab 601, tab shaping seat 70, tab clamp 80. Detailed implementation manners

[0035] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0036] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] The following will be combined with Figures 1 - 13 Describe in detail the welding head structure 10 according to an embodiment of the present application and the ultrasonic welding system 100 having the welding head structure 10.

[0038] Refer to Figures 1 - 3 As shown, the welding head structure 10 according to an embodiment of the present application includes a welding head body 1. The welding head body 1 has a negative pressure surface 11 and a welding surface 12. The welding surface 12 is adapted to contact the workpiece to be welded. The negative pressure surface 11 is recessed relative to the welding surface 12 to be away from the workpiece to be welded, so that when the welding surface 12 contacts the workpiece to be welded, the negative pressure surface 11 is separated from the workpiece to be welded. A negative pressure channel is provided inside the welding head body 1. One end of the negative pressure channel penetrates to the negative pressure surface 11, and the other end of the negative pressure channel is connected to a negative pressure source.

[0039] When using the welding head structure 10 to weld the workpiece to be welded, the negative pressure surface 11 is separated from the workpiece to be welded, the welding surface 12 contacts the workpiece to be welded, and the negative pressure source generates a negative pressure at the position of the negative pressure surface 11 through the negative pressure channel. Under the action of the negative pressure, the particulate dust in the welding area where the welding surface 12 is located can be sucked into the negative pressure channel, making the welding area relatively clean.

[0040] Optionally, the negative pressure source can be arranged outside the welding head body 1. In this way, the particulate dust in the negative pressure channel can be further sucked outside the welding head body 1 by the negative pressure source, effectively removing the particulate dust generated during welding.

[0041] Alternatively, at least a part of the negative pressure source can be arranged inside the welding head body 1, making the overall structure of the welding head structure 10 compact.

[0042] The temperature at the position of the welding surface 12 is relatively high. While the negative pressure channel sucks in particulate dust, it can also carry away a part of the heat generated during the welding process, making the welding temperature moderate during the welding process, thus ensuring a better welding effect. The level of the welding temperature directly affects the quality and strength of the weld. If the welding temperature is too high or too low, the quality of the weld will decline. Specifically, during the welding process, too high a temperature will cause the weld to overheat, resulting in excessive growth of the material grains, thus significantly reducing the strength of the weld. While too low a temperature is likely to cause cold cracking of the weld, thereby reducing the strength and toughness of the weld.

[0043] When the workpiece to be welded is a metal part, the properties and structure of the metal material are also significantly affected by the welding temperature. If the welding temperature is too high, it will lead to changes in the microstructure such as the growth of metal material grains, grain boundary migration, and phase transformation, thus affecting the mechanical properties and corrosion resistance of the material. While too low a welding temperature is likely to result in cold brittleness, causing a decrease in the plasticity and toughness of the material. The negative pressure channel can absorb the welding heat in the welding area, so that the temperature of the welding area is not too high to ensure a better welding effect.

[0044] According to the soldering head structure 10 of the embodiment of the present application, by providing a negative pressure channel in the soldering head body 1, it is possible to absorb particulate dust and welding heat in the welding area, making the welding area relatively clean and the temperature of the welding area not too high, thus ensuring a better welding effect.

[0045] In some embodiments of the present application, referring to Figures 1 - 3 as shown, the negative pressure surface 11 and the welding surface 12 are located at the same end of the soldering head body 1. Specifically, both the negative pressure surface 11 and the welding surface 12 are located at the end of the soldering head body 1 facing the workpiece to be welded. In this way, the negative pressure surface 11 and the welding surface 12 are relatively close, and can absorb more particulate dust and welding heat in the welding area.

[0046] In some embodiments of the present application, referring to Figures 1 - 3 as shown, the negative pressure surface 11 and the welding surface 12 are adjacent. In this way, the negative pressure surface 11 and the welding surface 12 are relatively close, and can effectively absorb the particulate dust in the welding area where the welding surface 12 is located. The temperature at the position of the welding surface 12 is relatively high. The negative pressure surface 11 is arranged close to the welding surface 12, and can also effectively absorb the welding heat in the welding area.

[0047] In some embodiments of the present application, referring to Figures 1 - 3 as shown, one end of the negative pressure channel penetrates through to the negative pressure surface 11 to form a negative pressure hole 111 on the negative pressure surface 11.

[0048] In some embodiments of the present application, referring to Figure 1As shown, the negative pressure hole 111 is a circular hole, and the diameter of the negative pressure hole 111 is 0.8 mm to 1.2 mm. Optionally, the diameter of the negative pressure hole 111 can be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm. Of course, the diameter of the negative pressure hole 111 can also be other values between 0.8 mm and 1.2 mm, which will not be listed one by one here. When the diameter of the negative pressure hole 111 is too small, larger particles are difficult to enter the negative pressure hole 111; when the diameter of the negative pressure hole 111 is too large, the strength of the welding head body 1 is weakened greatly. Therefore, it is more appropriate to set the diameter of the negative pressure hole 111 to 0.8 mm to 1.2 mm.

[0049] In some embodiments of the present application, the negative pressure surface 11 is disposed on at least one side of the welding surface 12. When the welding surface 12 is rectangular, the negative pressure surface 11 can be disposed on one side, two sides, three sides, or four sides of the welding surface 12. Refer to Figures 1 - 3 As shown, the welding surface 12 is rectangular, and the negative pressure surface 11 is disposed on the transverse two sides of the welding surface 12. In other words, the negative pressure surface 11 is disposed on the two sides in the width direction of the welding surface 12. In some embodiments not shown in the figure, the negative pressure surface 11 can also be disposed on the longitudinal two sides of the welding surface 12, that is, the negative pressure surface 11 is disposed on the two sides in the length direction of the welding surface 12; or, the negative pressure surface 11 can be disposed on the longitudinal two sides and the transverse two sides of the welding surface 12; or, the negative pressure surface 11 can be disposed only on one longitudinal side of the welding surface 12; or, the negative pressure surface 11 can be disposed only on one transverse side of the welding surface 12.

[0050] In some embodiments of the present application, the negative pressure surface 11 is disposed around the outer periphery of the welding surface 12. For example, the welding surface 12 is circular, and the negative pressure surface 11 is disposed around the outer periphery of the welding surface 12 in a complete circle. Or, the welding surface 12 is rectangular, and the negative pressure surface 11 is disposed around the outer periphery of the welding surface 12 in a complete circle.

[0051] In some embodiments of the present application, refer to Figures 1 - 3 As shown, the negative pressure surface 11 is a flat surface. In this way, the structure of the negative pressure surface 11 is simple and it is convenient for processing and manufacturing.

[0052] In some embodiments of the present application, the negative pressure surface 11 is an arc surface. The negative pressure surface 11 can be recessed away from the workpiece to be welded, which is convenient for the negative pressure to decrease away from the welding area, so as to effectively clean the particulate dust in each area and save negative pressure resources. The negative pressure surface 11 can also be recessed towards the workpiece to be welded, which is convenient for the negative pressure to decrease near the welding area, so that the temperature near the welding area will not be too high and negative pressure resources are also saved.

[0053] In some embodiments of the present application, refer to Figure 1As shown, the width W1 of the negative pressure surface 11 ranges from 1.3 mm to 1.7 mm. For example, the width W1 of the negative pressure surface 11 can be 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, etc., or other values between 1.3 mm and 1.7 mm, which are not listed one by one here. The negative pressure holes 111 can be dispersedly arranged along the length direction of the negative pressure surface 11, or arranged in a matrix of multiple rows and multiple columns.

[0054] In some embodiments of the present application, the number of negative pressure channels is one or more, the negative pressure holes 111 correspond to the negative pressure channels one by one, and the number of negative pressure holes 111 is equal to the number of negative pressure channels.

[0055] In some embodiments of the present application, multiple negative pressure channels can be opened. Refer to Figure 2 As shown, unused negative pressure channels can be blocked with plugs 21.

[0056] In some embodiments of the present application, the number of negative pressure channels is multiple, the number of negative pressure holes 111 is multiple, and the negative pressure holes 111 are one or more combinations of circular holes, oval holes, triangular holes, and kidney-shaped holes. In Figure 1 the example shown, the negative pressure holes 111 are circular holes. In Figures 2 - 3 the example shown, the negative pressure holes 111 are kidney-shaped holes.

[0057] In some embodiments of the present application, the number of negative pressure channels is one, the number of negative pressure holes 111 is one, and the negative pressure holes 111 are one of circular holes, oval holes, triangular holes, and kidney-shaped holes.

[0058] In some embodiments of the present application, refer to Figures 1 - 3 As shown, the negative pressure source includes a negative pressure tube 2. The negative pressure tube 2 is connected to the welding head body 1, and the negative pressure tube 2 communicates with the other end of the negative pressure channel. By setting the negative pressure tube 2, a negative pressure is formed in the negative pressure channel through the negative pressure tube 2, and it is not necessary to directly connect a suction pump at the other end of the negative pressure channel, so that the spatial layout can be more reasonable.

[0059] Optionally, the negative pressure tube 2 is a flexible tube. In this way, the negative pressure tube 2 can be bent according to the actual space requirements, as Figure 3 shown.

[0060] Optionally, refer to Figures 1 - 3 As shown, the length of the negative pressure tube 2 is relatively long, so that it will not interfere with the stroke of the welding head body 1.

[0061] In some embodiments of the present application, refer to Figures 1 - 3 As shown, there can be multiple negative pressure tubes 2, and unused negative pressure tubes 2 can be blocked.

[0062] In some embodiments of the present application, the negative pressure source includes a suction pump. The suction pump is connected to the other end of the negative pressure channel through a negative pressure pipe 2. When the suction pump operates, a negative pressure is generated in the negative pressure channel.

[0063] In some embodiments of the present application, the negative pressure source includes a negative pressure pipe 2 and a suction pump. One end of the negative pressure pipe 2 is connected to the welding head body 1 and communicates with the other end of the negative pressure channel. The suction pump is connected to the other end of the negative pressure pipe 2. When the suction pump operates, a negative pressure is generated in the negative pressure pipe 2 and the negative pressure channel. The suction pump is far away from the welding head body 1, and the spatial layout is reasonable.

[0064] In some embodiments of the present application, referring to Figures 1 - 3 As shown, welding teeth 121 are provided on the welding surface 12. The welding teeth 121 are adapted to contact the workpiece to be welded. When the welding teeth 121 contact the workpiece to be welded, the welding teeth 121 evenly transfer ultrasonic vibration energy to the surface of the workpiece to be welded, ensuring the smooth transfer of energy and improving the welding accuracy.

[0065] Optionally, the welding teeth 121 can be triangular pyramid-shaped, quadrangular pyramid-shaped, pentagonal pyramid-shaped, etc., and their tips face the workpiece to be welded.

[0066] Optionally, referring to Figures 1 - 3 As shown, the number of the welding teeth 121 is multiple, and the multiple welding teeth 121 can improve the welding efficiency.

[0067] Or optionally, the number of the welding teeth 121 is one.

[0068] In some embodiments of the present application, referring to Figures 1 - 3 As shown, the welding head body 1 is of a cuboid structure. The welding head body 1 has a large surface 1a, a narrow surface, and an end surface 1b. The negative pressure surface 11 and the welding surface 12 are both located on the narrow surface. The negative pressure pipe 2 can be arranged on at least one of the large surface 1a and the end surface 1b. In Figures 1 - 2 the example shown, the negative pressure pipe 2 is arranged on the large surface 1a. In Figure 3 the example shown, the negative pressure pipe 2 is arranged on the end surface 1b.

[0069] Referring to Figures 4 - 11 As shown, according to another embodiment of the present application, the ultrasonic welding system 100 includes a first base 30, a second base 40, a welding head driving device 20, and the welding head structure 10 of the above embodiment. The first base 30 is used to fix the first workpiece to be welded, and the second base 40 is used to fix the second workpiece to be welded. One of the first base 30 and the second base 40 can move closer to or away from the other. For example, in Figures 4 - 11In the example, the second base 40 is movable relative to the first base 30 to approach or move away from the first base 30, or the first base 30 is movable relative to the second base 40 to approach or move away from the second base 40. The welding head driving device 20 is used to drive the welding head structure 10 to move so that the welding surface 12 contacts one of the first workpiece to be welded and the second workpiece to be welded, and the negative pressure surface 11 is adapted to be disposed opposite to and separated from the contacted one. For example, in Figures 4 - 11 the example, the welding head driving device 20 is used to drive the welding head structure 10 to move so that the welding surface 12 contacts the second workpiece to be welded, and the negative pressure surface 11 is adapted to be disposed opposite to the second workpiece to be welded, and the negative pressure surface 11 is adapted to be separated from the second workpiece to be welded. Alternatively, the welding head driving device 20 is used to drive the welding head structure 10 to move so that the welding surface 12 contacts the first workpiece to be welded, the negative pressure surface 11 is adapted to be disposed opposite to the first workpiece to be welded, and the negative pressure surface 11 is adapted to be separated from the first workpiece to be welded.

[0070] Optionally, the welding head driving device 20 can be a cylinder or a hydraulic cylinder or a motor.

[0071] The ultrasonic welding system 100 is a system that welds at least two workpieces to be welded together using ultrasonic welding technology. The ultrasonic welding system 100 may further include an ultrasonic generator, a transducer, and a horn device. Ultrasonic welding is to convert 50 / 60 Hz current into electrical energy of 15 KHz, 20 KHz, 30 KHz, or 40 KHz by an ultrasonic generator. The converted high-frequency electrical energy is converted again into mechanical motion of the same frequency by a transducer, and then the mechanical motion is transmitted to the welding head structure 10 through a horn device that can change the amplitude. The welding head structure 10 transmits the received vibration energy to the joint of the workpiece to be welded, and in this area, the vibration energy is converted into heat energy by friction to melt the workpiece to be welded.

[0072] The ultrasonic welding system 100 is widely used in the welding of various materials, such as plastics, metals, glasses, ceramics, etc. Ultrasonic welding technology has been widely used in the fields of automobiles, electronics, medical devices, household appliances, etc.

[0073] Taking the welding of the foil tab 601 of the battery cell 60 and the external tab 50 using the ultrasonic welding system 100 as an example, the first workpiece to be welded is the external tab 50, and the second workpiece to be welded is the foil tab 601 of the battery cell 60. In the welding process, high-frequency vibration waves are transmitted to the surfaces of the external tab 50 and the foil tab 601 through ultrasonic waves, and under pressure, the external tab 50 and the foil tab 601 are rubbed against each other to form a fusion between the molecular layers. Fine particle dust (such as copper and aluminum powder) is generated during the welding process and is sucked away through the negative pressure channel, thereby preventing the fine particle dust from affecting the product quality (such as the battery being prone to short circuit) and polluting the workshop environment.

[0074] Before ultrasonic welding, the external tab 50 and the foil tab 601 are placed on the first base 30 by the tab clamp 80. The battery cell 60 is fixed on the second base 40. The second base 40 is adjusted in position by a cylinder to approach the first base 30, so that the battery cell 60 descends, and the foil tab 601 is in parallel contact with the external tab 50. The welding head structure 10 presses down, the system emits ultrasonic waves, and the external tab 50 and the foil tab 601 are fusion-welded. During or after welding, a negative pressure source forms a negative pressure in the negative pressure channel, which can not only immediately take away particulate dust, but also take away part of the heat generated by welding, having the effect of cooling the welding area, so that the welding quality of the external tab 50 and the foil tab 601 reaches a better effect.

[0075] In some embodiments, the negative pressure adsorption function is turned on simultaneously after welding is completed, and the time difference is less than 100 ms.

[0076] A sealant 501 is provided on the external tab 50, and the negative pressure hole 111 corresponds to the junction of the sealant 501 and the foil tab 601, avoiding metal debris being electrostatically adsorbed on the sealant 501 of the external tab 50 and being unable to be effectively removed.

[0077] Figure 12 It is a schematic diagram of the external tab 50 on the tab shaping seat 70. On the tab shaping seat 70, the sealant 501 covers a part of the external tab 50, and a part of the exposed area is used for welding and fixing with the foil tab 601 at the welding mark position A. After the external tab 50 is shaped on the tab shaping seat 70, the external tab 50 on the tab shaping seat 70 is clamped away from the tab shaping seat 70 by the tab clamp 80. Through the control program, the external tab 50 is maintained in the shaped state, and the external tab 50 on the tab shaping seat 70 is clamped to the first base 30 by the tab clamp 80.

[0078] The battery cell 60 can be formed by stacking multiple electrode plates. The multiple electrode plates include a positive electrode plate and a negative electrode plate. The foil tabs 601 of all the positive electrode plates are stacked together to form a positive foil tab 601a, and the foil tabs 601 of all the negative electrode plates are stacked together to form a negative foil tab 601b. The external tab 50 includes a positive external tab 50a and a negative external tab 50b. The positive external tab 50a is welded and fixed to the positive foil tab 601a, and the negative external tab 50b is welded and fixed to the negative foil tab 601b.

[0079] According to the ultrasonic welding system 100 of the embodiment of the present application, the welding head structure 10 can absorb particulate dust and welding heat in the welding area by arranging a negative pressure channel in the welding head body 1, making the welding area relatively clean and the temperature of the welding area not too high, so as to ensure better welding effect, reduce the short-circuit rate of the battery cell 60, and improve the safety performance of the battery cell 60.

[0080] According to the ultrasonic welding system 100 of the embodiments of the present application, during ultrasonic welding, the welding head structure 10 performs negative pressure dust removal at the edge of the welding position, which can effectively prevent metal particles from adhering to the sealant 501 and being difficult to remove. It can also effectively prevent metal particles from floating into the surface of the battery cell 60 and adhering, avoiding entering the interior of the battery cell 60 with the electrolyte after being put into the shell, resulting in low voltage or short circuit and fire safety accidents of the battery cell 60. After welding is completed, the temperature at the welding mark position A is relatively high instantaneously, and the negative pressure environment at the negative pressure surface 11 can also play a cooling role, ensuring an appropriate welding temperature in the welding area, so that the intermolecular fusion effect is better, forming better welding quality. At the same time, it also prevents the sealant 501 from being scalded due to excessive temperature, resulting in poor encapsulation and sealing effect.

[0081] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0082] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the connection inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0083] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A welding head structure, characterized in that, It includes a welding head body (1), the welding head body (1) has a negative pressure surface (11) and a welding surface (12) adapted to contact the workpiece to be welded. The negative pressure surface (11) is recessed relative to the welding surface (12) to be away from the workpiece to be welded. A negative pressure channel is provided inside the welding head body (1). One end of the negative pressure channel penetrates to the negative pressure surface (11), and the other end of the negative pressure channel is connected to a negative pressure source.

2. The welding head structure according to claim 1, wherein, The negative pressure surface (11) and the welding surface (12) are located at the same end of the welding head body (1).

3. The soldering head structure according to claim 1, characterized in that One end of the negative pressure channel penetrates to the negative pressure surface (11) to form a negative pressure hole (111) on the negative pressure surface (11). The negative pressure hole (111) is one or a combination of a circular hole, an oval hole, a triangular hole, a conical hole, and a kidney-shaped hole.

4. The soldering head structure according to claim 1, characterized in that, The negative pressure surface (11) is provided on at least one side of the welding surface (12).

5. The soldering head structure according to claim 1, characterized in that, The negative pressure surface (11) is disposed around the outer periphery of the welding surface (12).

6. The soldering head structure according to claim 1, wherein The negative pressure surface (11) is a flat surface.

7. The welding head structure according to any one of claims 1-6, characterized in that, The number of the negative pressure channels is one or more.

8. The soldering head structure according to claim 7, wherein, The negative pressure source includes a negative pressure pipe (2), and the negative pressure pipe (2) is connected to the welding head body (1) and communicates with the other end of the negative pressure channel.

9. The soldering head structure according to claim 1, wherein Welding teeth (121) are provided on the welding surface (12), and the welding teeth (121) are adapted to contact the workpiece to be welded.

10. An ultrasonic welding system, characterized in that, It includes: The welding head structure according to any one of claims 1-9; A first base (30) for fixing a first workpiece to be welded; A second base (40) for fixing a second workpiece to be welded. One of the first base (30) and the second base (40) can move closer to or away from the other. A welding head driving device (20) for driving the welding head structure to move so that the welding surface (12) contacts one of the first workpiece to be welded and the second workpiece to be welded, and the negative pressure surface (11) is adapted to be disposed opposite to and separated from the contacted one.

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