Welding head structure and welding equipment

Abstract

The utility model discloses a welding head structure and welding equipment, and belongs to the technical field of battery manufacturing, the welding head structure comprises a welding head body, the welding surface of the welding head body is provided with a plurality of first welding teeth and second welding teeth, and the first welding teeth and the second welding teeth are used for being in contact with a protection sheet when a tab and a connecting sheet are welded; the first welding tooth and the second welding tooth are both of a polygonal structure and each comprise at least three interior angles, and every two adjacent or opposite interior angles are acute angles. The first welding teeth and the second welding teeth are arranged at intervals in a staggered mode, the edges of the first welding teeth are parallel to the long edges of the protection piece, and the vertex angle positions of the first welding teeth correspond to the middle area of the protection piece. According to the utility model, the contact area between the welding teeth and the tabs can be increased, the welding strength is improved, the insufficient welding of the tabs and the abnormal welding head bonding are reduced, and the process yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and manufacturing, and specifically, to a welding head structure and a welding device. Background Art

[0002] A lithium battery is a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high requirements for the environment.

[0003] When producing lithium batteries, the electrode tabs of the positive and negative electrodes of two core rolls need to be welded to the connecting piece with the same polarity. During the welding process, a copper material protection sheet is added between the electrode plate and the welding head to play a role in protecting the welding and protecting the electrode tabs. The welding teeth of the traditional welding head are of a square structure, with a relatively large single contact area and a small number, resulting in the non-maximized utilization area of the protection sheet; the number of grooves between the welding teeth is insufficient, and the welding strength can still be improved.

[0004] There are also technologies in the prior art that change the shape of the welding teeth. For example, the Chinese patent document with the publication number CN219541990U discloses a welding head structure and a welding device for ultrasonic welding. The welding head structure for ultrasonic welding includes: a welding head having a working surface; at least one welding tooth fixed to the working surface; wherein each welding tooth includes a first welding piece and a second welding piece connected to each other. The outer peripheral surface of the first welding piece is a curved surface, and the end surface of the second welding piece away from the welding head is a flat surface. Among them, the second welding piece is one or more of a triangle, a cone, and a polygon.

[0005] Although the second welding piece of the above welding teeth adopts shapes such as a triangle, a cone, and a polygon, the arrangement of the welding teeth still results in an insufficient utilization area of the protection sheet, reducing the welding quality. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a welding head structure and a welding device to solve the problem that the arrangement of the welding teeth in the prior art leads to an insufficient utilization area of the protection sheet, resulting in a reduction in welding quality.

[0007] To achieve the above purpose, the utility model provides a welding head structure, including a welding head body. A plurality of first welding teeth and second welding teeth are installed on the welding surface of the welding head body. The first welding teeth and the second welding teeth are used to contact the protection sheet or the electrode tab when welding the electrode tab and the connecting piece; both the first welding teeth and the second welding teeth are of a polygon structure, and both the first welding teeth and the second welding teeth include at least three interior angles, and two adjacent or opposite interior angles are acute angles; the first welding teeth and the second welding teeth are arranged in a staggered and spaced manner. The side of the first welding tooth is parallel to the long side of the protection sheet, and the vertex position of the first welding tooth corresponds to the middle area of the protection sheet.

[0008] In the prior art, the welding teeth of the welding head for welding the tabs of lithium batteries are usually square structures. The contact area of a single square welding tooth is relatively large and the number is small, resulting in the non-maximization of the utilization area of the protection sheet and affecting the welding quality. In the present utility model, both the first welding tooth and the second welding tooth are polygon structures and two adjacent or opposite inner angles are acute angles. Therefore, the first welding tooth and the second welding tooth are non-square structures. On the premise of the same perimeter, the area of a single welding tooth with a non-square structure is smaller, and more welding teeth can be arranged on a welding head of the same size. Therefore, the contact area with the protection sheet during welding is smaller, and more welding teeth can be contacted on a protection sheet of the same area. Thus, the area of the protection sheet can be utilized more fully, improving the welding quality. Moreover, the arrangement of the welding teeth is changed from side-by-side to a three-row arrangement, increasing the contact area between the welding teeth and the tab, increasing the welding strength, thereby reducing abnormal situations such as false soldering of the tab and sticking of the welding head, and improving the process yield.

[0009] Further, the number of inner angles of the first welding tooth is less than the number of inner angles of the second welding tooth.

[0010] Through the above technical solution, the number of sides of the first welding tooth is correspondingly less than the number of sides of the second welding tooth. In the limited welding surface of the welding head, as many welding teeth as possible can be installed, thereby increasing the contact of the welding teeth with the protection sheet and further improving the welding strength.

[0011] Further, the first welding tooth is a triangular structure, the second welding tooth is a rhombic structure, and the side of the triangular structure is parallel to the side of the adjacent rhombic structure and forms a groove.

[0012] The areas of the triangle and the rhombus are smaller than the square area under the same perimeter, which is beneficial to increasing the number of welding teeth; the parallelism of the side of the triangle and the side of the rhombus is conducive to the closer arrangement of the welding teeth, and the existence of the groove can improve the welding strength.

[0013] Further, the welding head body includes two rows of first welding teeth and one row of second welding teeth, and the second welding teeth are located between the two rows of first welding teeth.

[0014] The arrangement of the first welding teeth and the second welding teeth is more reasonable, which can make full use of the limited welding area of the welding head and increase the number of welding teeth.

[0015] Further, both the first welding teeth and the second welding teeth are evenly distributed along the length direction of the welding head body.

[0016] The uniform distribution of the first welding teeth and the second welding teeth makes the grooves between the first welding teeth and the second welding teeth more uniform, thereby improving the welding quality.

[0017] Further, the two rows of the first welding teeth are symmetrically arranged with respect to the midline in the length direction of the welding head body.

[0018] The edges of the first welding teeth in two rows are respectively parallel to the long sides of the protection sheet. Correspondingly, the two rows of first welding teeth can be distributed at the edges of the two long sides of the welding head body, and the welding space of the welding head body can be reasonably utilized.

[0019] Furthermore, the first welding teeth are of an equilateral triangle structure, and the second welding teeth are of a rhombus structure with two acute angles of 60° for the two diagonals of the rhombus.

[0020] The first welding teeth and the second welding teeth are more easily arranged through specific shapes, and at the same time, the welding space of the welding head body can be more reasonably utilized, increasing the contact between the welding teeth and the protection sheet and improving the welding quality.

[0021] Furthermore, both the first welding teeth and the second welding teeth are detachably connected to the welding head body.

[0022] Through the above technical solution, the first welding teeth and the second welding teeth can be detached from the welding head body. On the one hand, it is convenient to replace the first welding teeth and the second welding teeth. On the other hand, it is convenient to arrange the first welding teeth and the second welding teeth, and different arrangement schemes of the first welding teeth and the second welding teeth can be determined according to different welding requirements.

[0023] A welding device adopts the above-mentioned welding head structure.

[0024] This welding device can improve the welding quality of the lithium battery tab.

[0025] Adopting the technical solution provided by the present utility model, compared with the existing well-known technologies, it has the following beneficial effects:

[0026] In the welding head structure of the present utility model, both the first welding teeth and the second welding teeth are of a polygonal structure and two adjacent or opposite interior angles are acute angles, so the first welding teeth and the second welding teeth are non-square structures. On the premise of the same perimeter, the area of a single non-square welding tooth is smaller, and more welding teeth can be arranged on a welding head of the same size. Therefore, the contact area with the protection sheet during welding is smaller, and more welding teeth can be contacted on a protection sheet of the same area. Thus, the area of the protection sheet can be more fully utilized to improve the welding quality. The edges of the first welding teeth are parallel to the long sides of the protection sheet, and the vertex angle positions of the first welding teeth correspond to the middle area of the protection sheet. The first welding teeth and the second welding teeth can form at least three rows of arrangements, increasing the contact area between the welding teeth and the tab, increasing the welding strength, and further reducing the abnormal conditions of tab virtual welding and sticking to the welding head, improving the process yield.

[0027] Obviously, the elements or features described in the above single embodiments can be used alone or in combination in other embodiments. Description of the Drawings

[0028] In the drawings, the dimensions and proportions do not represent the dimensions and proportions of the actual product. The drawings are merely illustrative and, for clarity, certain non-essential elements or features are omitted.

[0029] Figure 1 is a schematic structural diagram of the welding head in an embodiment of the present utility model;

[0030] Figure 2 is a schematic structural diagram of the welding head when welding the tab.

[0031] Description of Reference Numerals

[0032] 100, welding head body; 110, first welding teeth; 120, second welding teeth; 130, groove. Detailed Embodiment

[0033] Next, the present utility model will be described in detail with reference to the drawings. What is described here is only the preferred embodiment of the present utility model, and those skilled in the art can think of other ways to implement the present utility model based on the preferred embodiment, and these other ways also fall within the scope of the present utility model.

[0034] Embodiment

[0035] When producing lithium batteries, the tabs of the positive and negative electrodes of two winding cores need to be welded to the connecting piece with the same polarity. During the welding process, a copper material protection sheet is added between the electrode sheet and the welding head to play a role in protecting the welding and protecting the tab. The welding teeth of the traditional welding head are of a square structure, with a relatively large single contact area and a small number, resulting in the non-maximized utilization area of the protection sheet.

[0036] For this reason, referring to Figure 1 and Figure 2 , this embodiment provides a welding head structure, including a welding head body 100. A plurality of first welding teeth 110 and second welding teeth 120 are installed on the welding surface of the welding head body 100. The first welding teeth 110 and the second welding teeth 120 are used to contact the protection sheet or the tab when welding the tab and the connecting piece; both the first welding teeth 110 and the second welding teeth 120 are of a polygonal structure, and both the first welding teeth 110 and the second welding teeth 120 include at least three interior angles, and two adjacent or opposite interior angles are acute angles; the first welding teeth 110 and the second welding teeth 120 are arranged in a staggered and spaced manner, the side of the first welding teeth 110 is parallel to the long side of the protection sheet, and the vertex position of the first welding teeth 110 corresponds to the middle area of the protection sheet.

[0037] It can be seen from this that both the first welding tooth 110 and the second welding tooth 120 are polygonal structures, and two adjacent or opposite interior angles are acute angles. Therefore, the first welding tooth 110 and the second welding tooth 120 are non-square structures. On the premise of the same perimeter, the area of a single welding tooth with a non-square structure is smaller, and more welding teeth can be arranged on a welding head of the same size. Therefore, when welding, the contact area with the protection piece is smaller, and more welding teeth can be contacted on a protection piece of the same area. Thus, the area of the protection piece can be utilized more fully, and the welding quality can be improved. The side of the first welding tooth 110 is parallel to the long side of the protection piece, and the vertex angle position of the first welding tooth 110 corresponds to the middle area of the protection piece. The first welding tooth 110 and the second welding tooth 120 can form a three-row arrangement. Compared with the traditional double-row arrangement structure of square welding teeth, the contact area between the welding teeth and the tab is increased, the welding strength is increased, and thus the virtual welding of the tab and the abnormal sticking of the welding head are reduced, and the process yield is improved.

[0038] Furthermore, the number of interior angles of the first welding tooth 110 is less than that of the second welding tooth 120. Correspondingly, the number of sides of the first welding tooth 110 is less than that of the second welding tooth 120. In the welding surface of the limited welding head body 100, welding teeth can be installed as many as possible, so as to increase the contact of the welding teeth with the protection piece and further improve the welding strength.

[0039] In some embodiments of the present application, as Figure 1 shown, the first welding tooth 110 is a triangular structure, and the second welding tooth 120 is a rhombic structure. The side of the triangular structure is parallel to the side of the adjacent rhombic structure and forms a groove 130. Under the same perimeter, the areas of the triangle and the rhombus are smaller than that of the square, which is beneficial to increasing the number of welding teeth; the parallelism between the side of the triangle and the side of the rhombus is conducive to the closer arrangement of the welding teeth, and the existence of the groove 130 can improve the welding strength. Moreover, since the first welding tooth 110 is a triangular structure and the second welding tooth 120 is a rhombic structure, the number of grooves 130 can be increased.

[0040] It can be understood that on the premise of ensuring the welding strength, the first welding tooth 110 is an equilateral triangular structure, the second welding tooth 120 is a rhombic structure, and two opposite angles of the rhombus are acute angles of 60°. The first welding tooth 110 and the second welding tooth 120 are more easily arranged through specific shapes, and at the same time, the welding space of the welding head body 100 can be utilized more reasonably, the contact between the welding teeth and the protection piece is increased, and the welding quality is improved.

[0041] In some embodiments of the present application, the welding head body 100 includes two rows of first welding teeth 110 and one row of second welding teeth 120, and the second welding teeth 120 are located between the two rows of first welding teeth 110. The arrangement of the first welding teeth 110 and the second welding teeth 120 is more reasonable. The staggered arrangement of the first welding teeth 110 and the second welding teeth 120 can make full use of the limited welding area of the welding head and increase the number of welding teeth. Moreover, both the first welding teeth 110 and the second welding teeth 120 are evenly distributed along the length direction of the welding head body 100, making the grooves 130 between the first welding teeth 110 and the second welding teeth 120 more uniform, thereby improving the welding quality. Further, the two rows of first welding teeth 110 are symmetrically arranged with respect to the midline in the length direction of the welding head body 100. The edges of the two rows of first welding teeth 110 are respectively parallel to the long sides of the protective sheet. Correspondingly, the two rows of first welding teeth 110 can be distributed at the edges of the two long sides of the welding head body 100, and the welding space of the welding head body 100 can be reasonably utilized.

[0042] In addition, for the convenience of maintaining the welding teeth and the welding head, in some embodiments of the present application, both the first welding teeth 110 and the second welding teeth 120 are detachably connected to the welding head body 100. The first welding teeth 110 and the second welding teeth 120 can be detached from the welding head body 100. On the one hand, it is convenient to replace the first welding teeth 110 and the second welding teeth 120. On the other hand, it is convenient to arrange the first welding teeth 110 and the second welding teeth 120, and determine different arrangement schemes of the first welding teeth 110 and the second welding teeth 120 according to different welding requirements.

[0043] On the other hand, the present application also provides a welding device that adopts the above welding head structure, and the welding device can improve the welding quality of the lithium battery tab.

[0044] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "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 utility model 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 therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] The protection scope of the present utility model is only defined by the claims. Benefiting from the teachings of the present utility model, those skilled in the art can easily recognize that alternative structures of the structures disclosed in the present utility model can be used as feasible alternative embodiments, and the embodiments disclosed in the present utility model can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A welding head structure, comprising a welding head body (100), wherein a plurality of first welding teeth (110) and second welding teeth (120) are installed on the welding surface of the welding head body (100), and the first welding teeth (110) and the second welding teeth (120) are used to contact a protection sheet or an electrode tab when welding the electrode tab and the connecting piece; characterized in that, The first welding teeth (110) and the second welding teeth (120) are both polygonal structures. The first welding teeth (110) and the second welding teeth (120) each include at least three interior angles, and two adjacent or opposite interior angles are acute angles. The first welding teeth (110) and the second welding teeth (120) are arranged in a staggered and spaced manner. The sides of the first welding teeth (110) are parallel to the long sides of the protection sheet, and the apex positions of the first welding teeth (110) correspond to the middle region of the protection sheet.

2. The welding head structure according to claim 1, wherein The number of interior angles of the first welding teeth (110) is less than that of the second welding teeth (120).

3. The welding head structure according to claim 2, wherein, The first welding teeth (110) are triangular structures, and the second welding teeth (120) are diamond-shaped structures. The sides of the triangular structures are parallel to the sides of the adjacent diamond-shaped structures and form grooves (130).

4. A welding head structure according to claim 3, characterized in that, The welding head body (100) includes two rows of first welding teeth (110) and one row of second welding teeth (120). The second welding teeth (120) are located between the two rows of first welding teeth (110).

5. A welding head structure according to claim 4, characterized in that The first welding teeth (110) and the second welding teeth (120) are both evenly distributed along the length direction of the welding head body (100).

6. The welding head structure according to claim 4, characterized in that, The two rows of first welding teeth (110) are symmetrically arranged with respect to the midline in the length direction of the welding head body (100).

7. A welding head structure according to claim 3, characterized in that, The first welding teeth (110) are equilateral triangular structures, and the second welding teeth (120) are diamond-shaped structures, and two opposite angles of the diamond are acute angles of 60°.

8. A welding head structure according to claim 1, characterized in that, The first welding teeth (110) and the second welding teeth (120) are both detachably connected to the welding head body (100).

9. A welding device, characterized in that, The welding head structure according to any one of claims 1-8 is adopted.

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