Welding spot, welding head and welding equipment

Abstract

The utility model discloses a welding spot, a welding head and welding equipment, and relates to the technical field of ultrasonic welding. The welding spot comprises a base table and welding teeth, and the welding teeth are arranged on the base table. The number of the welding teeth is multiple, and the welding teeth are in a cylinder shape. The welding tooth of the welding spot adopts a cylindrical structure, and the size of the contact surface of the welding tooth and the tab is not changed by utilizing the characteristic that any two cross sections of the welding tooth are the same in size, so that the welding debugging times can be reduced, the same welding effect can be ensured, and the welding stability is remarkably improved; and meanwhile, the problem that the service life is short due to abrasion of the welding teeth can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic welding, in particular to a welding point, a welding head and welding equipment. Background Art

[0002] Ultrasonic welding, with its high quality, high efficiency, low consumption and clean characteristics, occupies an important position in the production of lithium batteries and has become the main technical means of connecting the tabs. Its working principle is to cleverly convert electrical energy into high-frequency vibration mechanical energy through the transducer, and then transmit it to the welding head. Under continuous pressure and high-frequency vibration, the welding head generates high-frequency friction between the tab and the foil, promoting mutual penetration and diffusion between molecules, thereby achieving solid-state bonding between molecules.

[0003] The welding head, as the core component of ultrasonic welding, has a decisive influence on the welding quality and service life due to its structure. At present, the welding teeth of the welding heads in the industry are generally designed in the shape of a regular tetrahedron. The upper tooth surface is a small regular surface, which is used to contact the pole ear; and the lower tooth surface is a large regular surface, which serves as a stable base for the welding teeth. However, with the repeated use of the welding head, the upper tooth surface will gradually wear under high-frequency vibration friction, so the upper teeth become wider and the tooth height decreases. This not only leads to an increase in the contact area between the pole ear and the welding head during welding, but also an increase in friction resistance, which seriously affects the welding effect. Therefore, the welding head needs to be replaced frequently. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a welding spot, a welding head and welding equipment.

[0005] The utility model discloses a welding spot, which comprises a base and welding teeth, wherein the welding teeth are arranged on the base; wherein the number of the welding teeth is multiple and the welding teeth are in a columnar shape.

[0006] According to one embodiment of the present invention, the welding tooth is cylindrical.

[0007] According to an embodiment of the present invention, the diameter D of the welding tooth is 0.05 to 0.5 mm.

[0008] According to one embodiment of the present invention, an arc surface is provided on the outer peripheral edge of the upper tooth end of the welding tooth.

[0009] According to one embodiment of the present invention, the radius R of the arc surface is 0.02 to 0.1 mm.

[0010] According to one embodiment of the present invention, the height H of the welding tooth is 0.1 to 0.5 mm.

[0011] According to one embodiment of the present invention, the welding teeth are distributed in a rectangular array, and the spacing P between two adjacent welding teeth is 0.5-1 mm.

[0012] The utility model discloses a welding head, comprising the welding spot as mentioned above, and the number of the welding spot is at least one.

[0013] The utility model discloses a welding device, which comprises the welding head as mentioned above.

[0014] Compared with the prior art, a welding mechanism of the utility model has the following advantages:

[0015] The welding point of the utility model adopts a columnar structure for its welding teeth, and utilizes the characteristic that any two cross sections thereof have the same size to keep the size of the contact surface between the welding teeth and the pole ear unchanged, which not only reduces the number of welding adjustments, but also ensures the same welding effect, and the stability of welding is significantly improved; at the same time, it can also effectively avoid the problem of short service life due to wear of the welding teeth.

[0016] In addition, the welding teeth of the welding point of the utility model are cylindrical in structure, which can avoid stress concentration at the corner and the tab foil during high-frequency vibration, thereby preventing welding failure.

[0017] In addition, in the welding point of the utility model, the outer peripheral edge of the upper tooth end of the welding tooth is provided with an arc surface, which can effectively improve the phenomenon of edge burrs generated during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 It is a structural schematic diagram of the welding point in Example 1;

[0020] Figure 2 is a structural cross-sectional view of a welding point in Embodiment 1;

[0021] Figure 3 It is a schematic diagram of the structure of the welding head in the second embodiment.

[0022] Description of reference numerals:

[0023] 01. Welding point; 1. Base; 2. Welding tooth; 21. Arc surface. DETAILED DESCRIPTION

[0024] The following will disclose multiple embodiments of the present invention with diagrams. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the diagram, some conventional structures and components will be depicted in a simple schematic manner in the diagram.

[0025] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0026] Embodiment 1

[0027] This embodiment provides a welding spot, which is used on a welding head of ultrasonic welding.

[0028] See also Figure 1 and 2 The welding point includes a base 1 and a welding tooth 2, one end of the welding tooth 2 is fixed on the base 1, and the other end of the welding tooth 2 is an upper tooth end, which is used to contact the pole ear during welding.

[0029] Specifically, there are multiple welding teeth 2. In this embodiment, the welding teeth 2 are distributed in a 3×4 rectangular array, and the spacing P between two adjacent welding teeth 2 is 0.5-1 mm, and the preferred value is 0.5 mm.

[0030] Furthermore, the welding tooth 2 is cylindrical. Since any two cross sections on the cylinder are the same in size, even if the welding tooth 2 is worn during use, the size of the contact surface between the welding tooth 2 and the pole lug remains unchanged, thereby ensuring the same welding effect.

[0031] In this embodiment, the welding tooth 2 is a cylindrical structure. Since the cylindrical structure has no corners, it can avoid stress concentration at the corners and the tab foil during high-frequency vibration, which may cause welding failure. The diameter D of the welding tooth 2 is 0.05-0.5 mm, and the preferred value is 0.5 mm; the height H of the welding tooth 2 is 0.1-0.5 mm, and the preferred value is 0.5 mm.

[0032] Furthermore, the outer peripheral edge of the upper tooth end of the welding tooth 2 is provided with an arc surface 21, that is, the outer peripheral edge of the upper tooth end of the welding tooth 2 is chamfered, which can effectively improve the phenomenon of edge burrs during welding. In this embodiment, the radius R of the arc surface 21 is 0.02-0.1 mm, and its preferred value is 0.05 mm.

[0033] The welding teeth of this welding spot adopt a cylindrical structure, and the characteristic that any two cross sections are the same size is used to keep the size of the contact surface between the welding teeth and the pole ear unchanged, which not only reduces the number of welding adjustments, but also ensures the same welding effect, and the stability of welding is significantly improved; at the same time, it can also effectively avoid the problem of short service life due to wear of the welding teeth.

[0034] In addition, the welding teeth are cylindrical in structure, which can avoid stress concentration and welding failure caused by high-frequency vibration of the corner and the tab foil. In addition, the outer edge of the upper tooth end of the welding teeth is provided with an arc surface, which can effectively improve the phenomenon of edge burrs during welding.

[0035] Embodiment 2

[0036] This embodiment provides a welding head, see Figure 3 The welding head includes the welding point 01 described in the first embodiment, wherein the number of the welding point 01 is at least one welding point.

[0037] In this embodiment, the number of the welding points 01 is three, and the three welding points 01 are arranged side by side.

[0038] Embodiment 3

[0039] This embodiment provides a welding device, which includes the welding head described in the second embodiment.

[0040] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A solder joint, characterized in that: It comprises a base (1) and a welding tooth (2), wherein the welding tooth (2) is arranged on the base (1); wherein the welding tooth (2) is multiple in number and each of the welding teeth (2) is cylindrical.

2. The solder joint according to claim 1, characterized in that The diameter D of the welding tooth (2) is 0.05-0.5 mm.

3. The solder joint according to claim 1, characterized in that An arc surface (21) is provided on the outer peripheral edge of the upper tooth end of the welding tooth (2).

4. The solder joint according to claim 3, characterized in that The radius R of the arc surface (21) is 0.02-0.1 mm.

5. The solder joint according to claim 1, characterized in that The height H of the welding tooth (2) is 0.1-0.5 mm.

6. The solder joint according to claim 1, characterized in that The welding teeth (2) are distributed in a rectangular array, and the spacing P between two adjacent welding teeth (2) is 0.5-1 mm.

7. A welding head, characterized in that: Comprising a welding point (01) as claimed in any one of claims 1 to 6, the number of the welding point (01) is at least one.

8. A welding device, characterized in that: Comprising the welding head as claimed in claim 7.

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