Ultrasonic welding head and welding equipment

Abstract

The utility model provides an ultrasonic welding head and welding equipment, and relates to the technical field of welding. The ultrasonic welding head comprises a rod part, a head part and a plurality of welding teeth; the head part is connected with one end of the rod part and is provided with a first surface in the first direction, and the first surface comprises a welding tooth area and a limiting area arranged around the welding tooth area; the welding teeth are arranged in the welding tooth area at intervals; in the direction away from the welding tooth area, the limiting area has the width size W, W is larger than or equal to 0.5 mm, and the first direction is perpendicular to the axial direction of the rod part. According to the scheme, when the welding head is used for welding the tabs, the tabs which are located around the welding teeth and are about to be warped and wrinkled are limited through the limiting area so that the tabs located around the welding teeth can be prevented from being cracked by ultrasonic vibration, and the ultrasonic welding head can have enough limiting area so that the tabs located around the welding teeth can be prevented from being warped and wrinkled. Therefore, the welding quality of the tabs can be improved.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to an ultrasonic welding head and welding equipment. Background Art

[0002] The tab is a crucial component in a power battery, connecting the battery core to the battery pole to facilitate current transfer between the core and the pole. Tabs are primarily made of metal foil, such as aluminum foil for the positive tab and copper foil for the negative tab. Tabs are multi-layered, stacked one on top of the other. To control the volume of the stacked tabs and ensure the stability of current transfer through the tabs, an ultrasonic welding head is used to weld the stacked tabs together and connect them to the pole.

[0003] During welding, the horn is aligned with the tab and appropriate pressure is applied so that the welding teeth of the ultrasonic horn squeeze the tab. Then the ultrasonic welding equipment is started to make the welding teeth generate high-frequency vibrations, thereby generating friction between the tab and the corresponding component to complete the welding.

[0004] During the welding process, the welding teeth squeeze the tab, causing the foil in the pressed part of the tab to sink. At the same time, the foil adjacent to the pressed part is pulled by the sinking foil, causing it to warp and wrinkle. This can cause the warped and wrinkled foil to be ultrasonically cracked, resulting in poor tab welding quality. Utility Model Content

[0005] The embodiments of the present application provide an ultrasonic welding head and welding equipment, which can improve the welding quality of the tab.

[0006] In a first aspect, an embodiment of the present application provides an ultrasonic welding head, which includes a rod, a head and a plurality of welding teeth; the head is connected to one end of the rod, and along a first direction, the head has a first surface, the first surface including a welding tooth area and a limiting area arranged around the welding tooth area; a plurality of welding teeth are arranged at intervals in the welding tooth area; wherein, along a direction away from the welding tooth area, the limiting area has a width dimension W, satisfying: W ≥ 0.5 mm, and the first direction is perpendicular to the axial direction of the rod.

[0007] In one embodiment, the width dimension W of the limiting area satisfies: 0.5 mm ≤ W ≤ 3 mm.

[0008] In one embodiment, the distance between the limiting area and the axis of the rod portion gradually decreases in a direction away from the welding tooth area.

[0009] In one embodiment, the angle formed between the limiting area and the welding tooth area is α, which satisfies: 160°≤α≤179°.

[0010] In one embodiment, the welding tooth area is rectangular, and the limiting area includes four sub-areas arranged around the welding tooth area. The four sub-areas correspond one-to-one to the four side lines of the welding tooth area. Each sub-area is connected to the corresponding side line, and the adjacent sides of two adjacent sub-areas are connected to each other.

[0011] In one embodiment, the head has a peripheral side wall parallel to the first direction, the side of the limiting area away from the welding tooth area is connected to the peripheral side wall, and a chamfer is provided at the connection between the peripheral side wall and the limiting area.

[0012] In one embodiment, in a cross section of the welding tooth, the welding tooth has a longest diameter and a shortest diameter, and the direction of the longest diameter is configured to be parallel to the vibration direction of the ultrasonic horn during operation.

[0013] In one embodiment, the welding tooth is an elliptical spherical segment structure, and the center of the elliptical spherical segment structure is located in the head.

[0014] In one embodiment, in the ellipsoidal spherical structure corresponding to the ellipsoidal spherical segment structure, the major semi-axis size of the largest elliptical cross section of the ellipsoidal spherical structure is R1, and the minor semi-axis size is R2, satisfying: 40% R1≤R2≤80%R1.

[0015] In one embodiment, the welding tooth includes two end blocks and an intermediate block. The end blocks are spherical segment structures, and the intermediate block is a semi-cylindrical structure. The axial direction of the semi-cylinder is parallel to the direction of the longest diameter. The two ends of the semi-cylinder are respectively connected to the two end blocks. The outer peripheral surface of the intermediate block smoothly transitions to the spherical surface of the end block. The two end blocks and the intermediate block are all connected to the welding tooth area. The center of the spherical segment structure is collinear with the axis of the semi-cylinder and is located inside the head.

[0016] In one embodiment, the distance between the axis of the semi-cylinder and the weld tooth area is H1, and the end block has a first spherical diameter SR1, which satisfies: 0

[0017] In one embodiment, the welding tooth includes a contact block having a spherical segment structure, and a flat side of the contact block is connected to the welding tooth area.

[0018] In one embodiment, the center of the contact block is located inside the head, and the welding tooth further includes an extension section, which is a cylindrical structure located between the contact block and the welding tooth area, and its two axial ends are respectively connected to the welding tooth area and the contact block.

[0019] In one embodiment, the height dimension of the extension section is H2, and the contact block has a second spherical diameter SR2, satisfying: 0<H2≤10%SR2.

[0020] In one embodiment, the center of the contact block is located outside the head.

[0021] ​In one embodiment, the distance between the spherical center of the contact block and the welding tooth area is H3, and the contact block has a third spherical diameter SR3, which satisfies: 0<H3≤10%SR3.

[0022] In one embodiment, a contact plane is provided on a side of the welding tooth facing away from the welding tooth area.

[0023] In the second aspect, an embodiment of the present application provides a welding device, which includes a welding seat, an ultrasonic generator, a driving platform and the aforementioned ultrasonic welding head; the welding seat and the welding teeth are opposite to each other and are arranged at intervals; the ultrasonic generator is connected to the ultrasonic welding head; the driving platform is connected to the rod to drive the ultrasonic welding head close to or away from the welding seat.

[0024] Beneficial effects of the embodiments of the present application:

[0025] In the embodiments of the present application, by providing a limiting area around the welding tooth area and limiting the width of the limiting area to no less than 0.5 mm, the limiting area can be used to limit the tabs around the welding tooth that are about to warp or wrinkle when the welding head is welding the tab, thereby preventing the tabs around the welding tooth from being ultrasonically cracked, and the ultrasonic welding head can also have a sufficient limiting area to prevent the tabs around the welding tooth from warping or wrinkling. In this way, the welding quality of the tabs can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 Schematic diagram of the structure of the ultrasonic welding head provided in the embodiment of the present application;

[0028] Figure 2 This is a partial structural diagram of a head with a first type of welding teeth provided in an embodiment of the present application;

[0029] Figure 3 is a top view of the first surface provided in an embodiment of the present application;

[0030] Figure 4 yes Figure 2 Top view of the middle AA;

[0031] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0032] Figure 6 is a partial side view of a head with a first type of welding teeth provided in an embodiment of the present application;

[0033] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0034] Figure 8 This is a partial structural diagram of a head with a second type of welding teeth provided in an embodiment of the present application;

[0035] Figure 9 is a partial side view of a head with a second type of welding teeth provided in an embodiment of the present application;

[0036] Figure 10 yes Figure 9 Enlarged view of point D in the middle;

[0037] Figure 11 This is a partial structural diagram of a head with a third type of welding teeth provided in an embodiment of the present application;

[0038] Figure 12 is a side view of a third welding tooth provided in an embodiment of the present application;

[0039] Figure 13 This is a partial structural diagram of a head with a fourth type of welding teeth provided in an embodiment of the present application;

[0040] Figure 14 This is a side view of the fourth welding tooth provided in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1-Ultrasonic welding head;

[0043] 11-rod;

[0044] 12-head; 122-first surface; 123-weld tooth area; 124-limiting area; 1241-sub-area; 125-side wall; 126-rounded corner;

[0045] 13-welding tooth; 131-end block; 132-middle block; 133-contact block; 134-extension section;

[0046] 14-Contact plane. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0048] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, the meaning of "multiple" is two or more, unless otherwise clearly defined.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0050] The terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0051] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate an example, illustration, or description. Any embodiment or design described as "for example" or "for example" in the embodiments of this application is not to be construed as being preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to clearly present relative concepts.

[0052] See also Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of an ultrasonic welding head 1 provided in an embodiment of the present application. Figure 2 This is a schematic diagram of the partial structure of a head 12 having a first type of welding teeth 13 provided in an embodiment of the present application. An embodiment of the present application provides an ultrasonic welding head 1. The ultrasonic welding head 1 includes a rod 11, a head 12 and a plurality of welding teeth 13. The head 12 is connected to one end of the rod 11. Along a first direction, the head 12 has a first surface 122. The first surface 122 includes a welding tooth area 123 and a limiting area 124 arranged around the welding tooth area 123. A plurality of welding teeth 13 are arranged at intervals in the welding tooth area 123. In the direction away from the welding tooth area 123, the limiting area 124 has a width dimension W, which satisfies: W ≥ 0.5 mm. The first direction is perpendicular to the axial direction of the rod 11.

[0053] It can be understood that, along the first direction, first surfaces 122 for connecting with the welding teeth 13 can be provided on both sides of the head 12 .

[0054] In addition, the welding teeth 13 can be integrally formed with the head 12 or welded to the head 12 .

[0055] In this embodiment, by providing a limiting area 124 around the welding tooth area 123 and limiting the width of the limiting area 124 to be no less than 0.5 mm, the limiting area 124 can be used to limit the tabs that are about to warp or wrinkle around the welding teeth 13 when the ultrasonic welding head 1 welds the tabs, thereby preventing the tabs around the welding teeth 13 from being cracked by ultrasonic vibration. At the same time, the ultrasonic welding head 1 can have a sufficient limiting area to prevent the tabs around the welding teeth 13 from warping or wrinkling. In this way, the welding quality of the tabs is improved.

[0056] In addition, by setting the limiting area 124, the warping and wrinkling of the part of the pole tab located around the welding tooth 13 can be alleviated, and the flatness of the pole tab can be improved, thereby reducing the welding stress of the pole tab to avoid cracks in the pole tab during the welding process or other welding quality problems caused by stress concentration, so as to ensure the reliable welding quality of the pole tab.

[0057] See also Figure 3 , Figure 3 FIG. 1 is a top view of the first surface 122 provided in an embodiment of the present application. In one embodiment, the width W of the limiting area 124 satisfies: 0.5 mm ≤ W ≤ 3 mm.

[0058] It can be understood that the width dimension W of the limiting area 124 includes but is not limited to: 0.5mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.6mm, 1.8mm, 1.9mm, 2mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, and 3mm.

[0059] In this embodiment, by limiting the maximum value of the width dimension W of the limiting area 124 , it is possible to avoid the width dimension of the limiting area 124 being too large, which would result in a larger size of the ultrasonic horn 1 , thereby controlling the material cost of the ultrasonic horn 1 .

[0060] Among them, the specific setting value of the width dimension W of the limiting area 124 can be adjusted according to the thickness of the tab layer to be welded. For example, when the thickness of the tab is larger, the width dimension W of the limiting area 124 can be set to be larger, otherwise, the width dimension W of the limiting area 124 can be set to be smaller.

[0061] In addition, the width W of the limiting area 124 in the vibration direction of the ultrasonic horn 1 can be set larger than the width W of the limiting areas 124 in other directions. For example, when the welding tooth area 123 is rectangular, it corresponds to four side lines, each side line corresponding to a limiting area 124. The width W of the limiting area 124 in the vibration direction of the ultrasonic horn 1 is not less than the width W of the limiting areas 124 in other directions. In this way, the ultrasonic horn 1 can increase its ability to limit the warping and wrinkling of the tab in its vibration direction, so that the layout of the limiting areas 124 matches the vibration direction of the ultrasonic horn 1. In this way, the welding quality of the tab can be improved.

[0062] See also Figure 4 , Figure 4 yes Figure 2 A top view taken along line AA in the figure. In one embodiment, the spacing between the limiting area 124 and the axis of the rod portion 11 gradually decreases as it moves away from the weld tooth area 123. This can mitigate deformation of the portion of the tab surrounding the weld tooth 13, thereby reducing stress in the tab during welding. This effectively prevents cracks from excessive deformation during welding, or other welding quality issues caused by stress concentration.

[0063] See also Figure 5 , Figure 5 yes Figure 4 In one embodiment, the angle formed between the limiting area 124 and the welding tooth area 123 is α, which satisfies the following: 160°≤α≤179°.

[0064] It can be understood that the angle α between the limiting area 124 and the welding tooth area 123 includes but is not limited to 160°, 161°, 162°, 163°, 164°, 165°, 166°, 167°, 168°, 170°, 173°, 175°, 176°, 177°, 178°, and 179°.

[0065] In this embodiment, by limiting the angle between the limiting area 124 and the welding tooth area 123 to α, on the one hand, it can avoid the angle being too large, which will cause the limiting surface to have an insignificant limiting effect on the tab around the welding tooth 13; on the other hand, it can avoid the angle being too small, which will cause it to exert greater pressure on the thicker tab layer, thereby improving the stress state of the tab around the welding tooth 13.

[0066] When the tab layer is thicker, the angle α between the limiting area 124 and the welding tooth area 123 is set to be smaller; otherwise, the angle α between the limiting area 124 and the welding tooth area 123 is set to be larger.

[0067] See also Figure 2In one embodiment, the weld tooth area 123 is rectangular. The limiting area 124 includes four sub-areas 1241 arranged around the weld tooth area 123. The four sub-areas 1241 correspond one-to-one with the four edges of the weld tooth area 123. Each sub-area 1241 is connected to its corresponding edge, and the adjacent sides of two adjacent sub-areas 1241 are connected to each other. This makes the limiting area 124 and the weld tooth area 123 simple in structure and convenient in layout, thereby improving the manufacturability of the ultrasonic horn 1.

[0068] See also Figure 2 In one embodiment, the head 12 has a peripheral side wall 125 parallel to the first direction, the limiting area 124 is connected to the peripheral side wall 125 on the side away from the welding tooth area 123, and a chamfer 126 is provided at the connection between the peripheral side wall 125 and the limiting area 124.

[0069] The radius of the fillet 126 ranges from 0.5 mm to 3 mm.

[0070] In this embodiment, the rounded surface formed by the chamfer 126 can smoothly transition and connect the limiting area 124 and the peripheral side wall 125. In this way, the appearance of sharp corners at the connection between the limiting area 124 and the peripheral side wall 125 can be avoided, thereby reducing the stress of the head 12 squeezing the tab, and further effectively avoiding stress concentration that causes cracks or other problems in the tab.

[0071] See also Figure 3 In one embodiment, the cross-section of the welding tooth 13 has a longest diameter and a shortest diameter. The direction of the longest diameter is arranged parallel to the vibration direction of the ultrasonic horn 1 during operation. This reduces the resistance of the horn in the vibration direction, thereby reducing the wear of the welding tooth 13 and extending the service life of the welding tooth 13. It also increases the contact area between the welding tooth 13 and the tab, which helps improve welding quality.

[0072] The orthographic projection of the welding tooth 13 in the welding tooth area 123 can be an ellipse, a waist circle, or a rectangle.

[0073] See also Figure 6 and Figure 7 , Figure 6 FIG. 1 is a partial side view of a head 12 having a first type of welding tooth 13 provided in an embodiment of the present application. Figure 7 yes Figure 6 In one embodiment, the welding tooth 13 is an elliptical spherical segment structure, the center of which is located inside the head 12.

[0074] It can be understood that an ellipsoidal segment refers to the portion of an ellipsoidal sphere obtained by cutting a plane. The cross section is called the base of the ellipsoidal segment, and the remaining surface is the ellipsoidal sphere. The ellipsoidal segment can be a hemisphere, or larger or smaller than a hemisphere. In this embodiment, the ellipsoidal segment is smaller than a hemisphere.

[0075] In this embodiment, by setting the welding tooth 13 to an elliptical spherical segment structure, not only the welding tooth 13 has the longest diameter and the shortest diameter to meet the requirement of reducing friction, but also the surface transition of the welding tooth 13 can be smooth without angular structures, thereby improving the stress state of the welding tooth 13.

[0076] Furthermore, by placing the center of the elliptical spherical segment within the head 12, the force from the tab reacting on the surface of the welding tines 13 is concentrated within the head 12, while the head 12 is much larger than the welding tines 13. This improves the stress on the welding tines 13 while allowing the head 12 to bear the majority of the load, thereby extending the life of the ultrasonic welding horn 1.

[0077] In one embodiment, in the ellipsoidal spherical structure corresponding to the ellipsoidal spherical segment structure, the major semi-axis size of the largest elliptical cross section of the ellipsoidal spherical structure is R1, and the minor semi-axis size is R2, satisfying: 40% R1≤R2≤80%R1.

[0078] It will be understood that the size R2 of the minor axis includes but is not limited to 40% R1, 42% R1, 43% R1, 45% R1, 47% R1, 49% R1, 50% R1, 53% R1, 58% R1, 60% R1, 64% R1, 66% R1, 67% R1, 68% R1, 70% R1, 72% R1, 75% R1, 77% R1, and 80% R1.

[0079] In addition, the range of R1 can be: 0.25-1.5 mm, so that the strength requirement of the welding teeth 13 can be met, and more welding teeth 13 can be arranged in a certain welding tooth area 123, so that the welding uniformity is better.

[0080] In this embodiment, the above-mentioned limitations minimize the difference between the major and minor diameters of the elliptical spherical segment structure, thereby improving the uniformity of force applied to the welding tooth 13, thereby better resisting external loads and reducing the possibility of localized stress concentration. This improves the service life of the welding tooth 13.

[0081] In addition to adopting the above-mentioned embodiment to realize that the welding tooth 13 has the longest diameter and the shortest diameter, the present application is also realized through the following embodiment.

[0082] See also Figure 8 and Figure 9 , Figure 81 is a partial structural diagram of a head 12 having a second type of welding teeth 13 provided in an embodiment of the present application. Figure 9 It is a partial side view of the head 12 with the second type of welding tooth 13 provided in an embodiment of the present application. Specifically, in one embodiment, the welding tooth 13 includes two end blocks 131 and an intermediate block 132. The end block 131 is a spherical segment structure. The intermediate block 132 is a semi-cylinder structure. The axial direction of the semi-cylinder is parallel to the direction of the longest diameter. The two ends of the semi-cylinder are respectively connected to the two end blocks 131, and the outer peripheral surface of the intermediate block 132 smoothly transitions to the spherical surface of the end block 131. The two end blocks 131 and the intermediate block 132 are all connected to the welding tooth area 123. The center of the spherical segment structure is collinear with the axis of the semi-cylinder and is located inside the head 12.

[0083] In this embodiment, through the above-mentioned setting, not only the welding tooth 13 has the longest diameter and the shortest diameter to meet the requirement of reducing friction, but also the welding tooth 13 in this embodiment can be made more regular than the welding tooth structure in the previous embodiment, thereby improving the machinability of the welding tooth 13 and reducing the processing cost.

[0084] In addition, the center of the spherical segment and the axis of the semi-cylinder are both located within the head 12, so that the force from the tab reacting on the surface of the welding tooth 13 is concentrated within the head 12. The head 12 is much larger than the welding tooth 13. This improves the stress state of the welding tooth 13 and allows the head 12 to bear the main load, thereby extending the life of the ultrasonic welding head 1.

[0085] The ball diameter of the end block 131 ranges from 0.25 to 1.5 mm, and the radius of the intermediate block 132 ranges from 0.25 to 1.5 mm. This ensures that the strength requirements of the welding teeth 13 are met while also allowing for a larger number of welding teeth 13 to be arranged within a given welding tooth area 123, resulting in better welding uniformity. Furthermore, the radius of the plane connecting the end block 131 and the intermediate block 132 is consistent with the radius of the intermediate block 132.

[0086] See also Figure 10 , Figure 10 yes Figure 9 In one embodiment, the distance between the axis of the semi-cylinder and the weld tooth area 123 is H1, and the end block 131 has a first spherical diameter SR1, which satisfies: 0

[0087] It can be understood that the distance H1 between the axis of the semi-cylinder and the weld tooth area 123 includes but is not limited to 1% SR1, 2% SR1, % SR1, 3% SR1, 4% SR1, 5% SR1, 6% SR1, 7% SR1, 8% SR1, 9% SR1, and 10% SR1.

[0088] ​It can be understood that since the size of the welding tooth 13 is small, the above-mentioned setting can not only make the center of the spherical segment structure and the axial direction of the semi-cylinder located inside the head 12, but also make the welding tooth 13 have a larger protrusion height than the welding tooth area 123, so that the welding tooth 13 has sufficient welding penetration force, thereby helping to improve the welding quality.

[0089] In addition to adopting the above-mentioned welding tooth structure with the longest diameter and the shortest diameter, the present application also provides a welding tooth structure with equal diameter through the following embodiments.

[0090] See also Figure 11 and Figure 12 , Figure 11 1 is a partial structural diagram of a head 12 having a third type of welding teeth 13 provided in an embodiment of the present application. Figure 12 FIG2 is a side view of a third welding tooth 13 provided in an embodiment of the present application. In one embodiment, the welding tooth 13 includes a contact block 133. The contact block 133 is a spherical segment structure. The flat side of the contact block 133 is connected to the welding tooth area 123.

[0091] As you can understand, a spherical segment is the portion of a sphere obtained by cutting it with a plane. The cross section is called the base of the segment, while the rest of the sphere is the surface. The segment can be a hemisphere, or larger or smaller than a hemisphere.

[0092] The ball diameter of the contact block 133 ranges from 0.25 to 1.5 mm.

[0093] In this embodiment, through the above-mentioned setting, the welding teeth 13 can be subjected to more uniform force, thereby improving the stress state of the welding teeth 13 and further increasing the service life of the welding teeth 13.

[0094] See also Figure 12 In one embodiment, the center of the contact block 133 is located within the head 12. The welding tooth 13 further includes an extension section 134. The extension section 134 is a cylindrical structure located between the contact block 133 and the welding tooth area 123, with its two axial ends connected to the welding tooth area 123 and the contact block 133 respectively.

[0095] In this embodiment, through the above-mentioned arrangement, on the one hand, the force of the tab reacting to the surface of the welding tooth 13 can be concentrated in the head 12, and the size of the head 12 is much larger than the size of the welding tooth 13; this can improve the stress state of the welding tooth 13, and make the head 12 bear the main load, so that the service life of the ultrasonic welding head 1 is improved; on the other hand, the welding tooth 13 can have a larger height protruding from the welding tooth area 123, so that the welding tooth 13 has sufficient welding penetration force, which is beneficial to improve the welding quality.

[0096] Furthermore, by providing the extension section 134 , the strength of the connection between the contact block 133 and the head 12 can be improved.

[0097] See also Figure 12 In one embodiment, the height dimension of the extension section 134 is H2, and the contact block 133 has a second ball diameter SR2, satisfying: 0<H2≤10%SR2.

[0098] It can be understood that the height dimension H2 of the extended section 134 includes but is not limited to 1%SR2, 2%SR2, %SR2, 3%SR2, 4%SR2, 5%SR2, 6%SR2, 7%SR2, 8%SR2, 9%SR2, and 10%SR2.

[0099] In addition, the distance between the spherical surface of the contact block 133 and the weld tooth area 123 is not less than 60% SR2.

[0100] In this embodiment, through the above arrangement, on the one hand, the center of the contact block 133 can be prevented from being located outside the head 12 , and on the other hand, the extension section 134 can have a sufficient size to ensure the connection strength between the contact block 133 and the head 12 .

[0101] In addition to adopting the above-mentioned equal-diameter welding tooth structure, the present application also provides another equal-diameter welding tooth structure through the following embodiments.

[0102] See also Figure 13 and Figure 14 , Figure 13 1 is a partial structural diagram of a head 12 having a fourth type of welding teeth 13 provided in an embodiment of the present application; Figure 14 This is a side view of the fourth welding tooth 13 provided in an embodiment of the present application. In one embodiment, the center of the contact block 133 is located outside the head 12. This simplifies the overall structure of the welding tooth 13 and provides a significant protrusion from the welding tooth area 123, ensuring sufficient penetration force for the welding tooth 13, thereby improving welding quality.

[0103] The ball diameter of the contact block 133 ranges from 0.25 to 1.5 mm.

[0104] In one embodiment, the distance between the center of the contact block 133 and the weld tooth area 123 is H3, and the contact block 133 has a third spherical diameter SR3, which satisfies: 0<H3≤10%SR3.

[0105] It can be understood that the distance H3 between the center of the contact block 133 and the weld tooth area 123 includes but is not limited to 1% SR3, 2% SR3, 3% SR3, 4% SR3, 5% SR3, 6% SR3, 7% SR3, 8% SR3, 9% SR3, and 10% SR3.

[0106] In this embodiment, through the above-mentioned limitation, on the one hand, the center of the contact block 133 can be located outside the head 12, and on the other hand, it can ensure that the welding tooth 13 and the welding tooth area 123 have sufficient connection area, thereby ensuring the reliability of the connection between the welding tooth 13 and the head 12.

[0107] See also Figure 2-14 In one embodiment, a contact plane 14 is provided on the side of the welding tooth 13 facing away from the welding tooth area 123. In this way, the contact area between the welding tooth 13 and the tab can be increased, thereby improving the welding quality.

[0108] It can be understood that the parts of the ultrasonic welding head 1 that will contact the tab are all rounded 126 to avoid cutting the foil.

[0109] Accordingly, embodiments of the present application also provide a welding device. The welding device includes a welding base, an ultrasonic generator, a drive platform, and the aforementioned ultrasonic horn 1. The welding base and welding teeth 13 are spaced apart and opposite each other. The ultrasonic generator is connected to the ultrasonic horn 1. The drive platform is connected to the rod 11 to drive the ultrasonic horn 1 toward or away from the welding base.

[0110] In this embodiment, by using the aforementioned ultrasonic horn 1, when the horn is welding the tab, the limiting area 124 can be used to limit the tab that is about to warp or wrinkle around the welding teeth 13, thereby preventing the tab around the welding teeth 13 from being cracked by ultrasonic vibration. At the same time, the ultrasonic horn 1 can have a sufficient limiting area to prevent the tab around the welding teeth 13 from warping or wrinkling. In this way, the welding quality of the tab can be improved.

[0111] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An ultrasonic welding head, characterized in that: include: Rod; A head connected to one end of the rod, wherein the head has a first surface along a first direction, the first surface including a welding tooth area and a limiting area arranged around the welding tooth area; A plurality of welding teeth are spaced apart in the welding tooth area; Wherein, along the direction away from the welding tooth area, the limiting area has a width dimension W, which satisfies: W≥0.5mm, and the first direction is perpendicular to the axial direction of the rod.

2. The ultrasonic horn according to claim 1, characterized in that: The width dimension W of the limiting area satisfies: 0.5mm≤W≤3mm.

3. The ultrasonic horn according to claim 1, characterized in that: In a direction away from the welding tooth area, the distance between the limiting area and the axis of the rod portion gradually decreases.

4. The ultrasonic horn according to claim 3, characterized in that: The angle formed between the limiting area and the welding tooth area is α, which satisfies the following: 160°≤α≤179°.

5. The ultrasonic welding head according to any one of claims 1 to 4, characterized in that: The welding tooth area is rectangular, and the limiting area includes four sub-areas arranged around the welding tooth area. The four sub-areas correspond one-to-one to the four side lines of the welding tooth area. Each sub-area is connected to the corresponding side line, and the adjacent sides of two adjacent sub-areas are connected to each other.

6. The ultrasonic welding head according to any one of claims 1 to 4, characterized in that: The head has a peripheral side wall parallel to the first direction, the side of the limiting area away from the welding tooth area is connected to the peripheral side wall, and a chamfer is provided at the connection between the peripheral side wall and the limiting area.

7. The ultrasonic welding head according to any one of claims 1 to 4, characterized in that: In the cross section of the welding tooth, the welding tooth has a longest diameter and a shortest diameter, and the direction of the longest diameter is configured to be parallel to the vibration direction of the ultrasonic horn when it is working.

8. The ultrasonic horn according to claim 7, characterized in that: The welding tooth is an elliptical spherical segment structure, and the center of the elliptical spherical segment structure is located in the head.

9. The ultrasonic horn according to claim 8, characterized in that: In the ellipsoidal structure corresponding to the ellipsoidal segment structure, the major semi-axis size of the largest elliptical cross-section of the ellipsoidal structure is R1, and the minor semi-axis size is R2, satisfying: 40% R1≤R2≤80% R1.

10. The ultrasonic horn according to claim 7, characterized in that: The welding tooth includes two end blocks and an intermediate block. The end blocks are spherical segment structures, and the intermediate block is a semi-cylindrical structure. The axial direction of the semi-cylinder is parallel to the direction of the longest diameter. The two ends of the semi-cylinder are respectively connected to the two end blocks. The outer peripheral surface of the intermediate block smoothly transitions to the spherical surface of the end block. The two end blocks and the intermediate block are all connected to the welding tooth area. The center of the spherical segment structure is collinear with the axis of the semi-cylinder and is located inside the head.

11. The ultrasonic horn according to claim 10, characterized in that: The distance between the axis of the semi-cylinder and the welding tooth area is H1, and the end block has a first spherical diameter SR1, which satisfies: 0<H1≤10%SR1.

12. The ultrasonic welding head according to any one of claims 1 to 4, characterized in that: The welding tooth includes a contact block, which is a spherical segment structure, and a plane side of the contact block is connected to the welding tooth area.

13. The ultrasonic horn according to claim 12, characterized in that: The center of the contact block is located in the head, and the welding tooth also includes an extension section, which is a cylindrical structure and is located between the contact block and the welding tooth area. Its two axial ends are respectively connected to the welding tooth area and the contact block.

14. The ultrasonic horn according to claim 13, characterized in that: The height dimension of the extension section is H2, and the contact block has a second spherical diameter SR2, which satisfies: 0<H2≤10%SR2.

15. The ultrasonic horn according to claim 12, characterized in that: The spherical center of the contact block is located outside the head.

16. The ultrasonic horn according to claim 15, characterized in that: The distance between the spherical center of the contact block and the welding tooth area is H3, and the contact block has a third spherical diameter SR3, which satisfies: 0<H3≤10%SR3.

17. The ultrasonic welding head according to any one of claims 1 to 4, characterized in that: A contact plane is provided on a side of the welding tooth facing away from the welding tooth area.

18. A welding device, characterized in that: include: The ultrasonic welding head according to any one of claims 1 to 17; a welding seat, opposite to the welding teeth and spaced apart; An ultrasonic generator connected to the ultrasonic welding head; The driving platform is connected to the rod portion to drive the ultrasonic welding head to approach or move away from the welding seat.

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