Ultrasonic welding and punching anti-warping bonding pad

Abstract

The utility model discloses an ultrasonic welding and punching anti-warping bonding pad, which comprises a bonding pad body of which the spreading area is larger than the upper surface area of an FPC (Flexible Printed Circuit) board, the contact part of the bonding pad body and the FPC board is a welding part, the part of the bonding pad body extending out of the edge of the FPC board is a punching part, and a partition hole is arranged between the welding part and the punching part. Partition holes are formed in the bonding pad body and arranged along the outer edge of the FPC board to form a cutting line, the sides, close to the welding portion, of the partition holes are shrunk inwards towards the center of the welding portion, the cutting line is formed through the partition holes formed in the bonding pad body and correspondingly formed along the edge line of the FPC board, and a cutter can separate the punching portion from the bonding pad body along the cutting line. The contact area of the cutter and the edge of the welding part is reduced, the acting stress of stamping and cutting on the whole edge of the welding part is reduced, the warping probability of the edge of the bonding pad is reduced, the influence on the ultrasonic welding quality is avoided, the welding strength can be improved due to the large area of the bonding pad, and the product yield and the production efficiency are high.

Description

Technical Field

[0001] The utility model belongs to the field of ultrasonic welding pad punching, in particular to an ultrasonic welding punching anti-warping pad. Background Art

[0002] With the rapid development of the new energy market, the demand for power and energy storage batteries is increasing. In the fierce market competition, designing battery packs to be light, small, and high-energy is a powerful way to improve competitiveness, and the compression of battery pack space has become a trend. In the existing integrated busbar design, copper pads are ultrasonically welded to aluminum bars. Ultrasonic welding does not require nickel sheets, saving space, reducing battery pack weight, and eliminating the environmental pollution caused by welding nickel sheets. The size of ultrasonic welding horns for new energy power battery FPCs is getting smaller and smaller, and the corresponding pad size is also smaller. To improve welding strength, it is necessary to use pad raw materials larger than the FPC board size. After the pad raw materials are laid to the FPC outer edge, the excess pad raw materials outside the FPC outer edge are punched out to obtain pads of almost the same size as the FPC board to increase the welding area. However, when punching the pads at the FPC outer edge, the pad edges are easily warped due to the punching force, affecting the quality of ultrasonic welding. Therefore, there is an urgent need in this field for ultrasonic welding punching anti-warping pads. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an ultrasonic welding punched anti-warping pad, which aims to solve the technical problem that the edge of the pad punched out of the FPC outer edge in the existing technology is very easy to warp and affect the quality of ultrasonic welding.

[0005] (2) Technical solution

[0006] The utility model provides an ultrasonic welding punching anti-warping pad, comprising a pad body whose spreading area is larger than the surface area of ​​an FPC board, the contact portion of the pad body with the FPC board being a welding portion, the portion of the pad body extending beyond the edge of the FPC board being a punching portion, a partition hole being provided between the welding portion and the punching portion, the partition hole forming a cutting line along the outer edge of the FPC board, and the side of the partition hole close to the welding portion being retracted inward toward the center of the welding portion.

[0007] Preferably, the welding portion, the punching portion and the partition hole are integrally stamped.

[0008] Preferably, the cutting line is formed by a plurality of partition holes arranged at intervals.

[0009] Preferably, the solid filling portion of the cutting line is a plurality of connecting portions, and the length a of any one of the connecting portions is smaller than the length b of any one of the partition holes.

[0010] Preferably, the partition hole is an elongated through hole.

[0011] Preferably, the shape of the end edge of the partition hole is arc-shaped, and the cutting line passes through the midpoint of the arc.

[0012] Preferably, the partition holes at the ends of both sides of the cutting line completely separate the connection between the welding portion and the punching portion along the extending direction of the ends of the cutting line.

[0013] Preferably, the number of the partition holes on the cutting line corresponding to the arc-shaped corners of the FPC board is at least one, and the shape of the partition holes is an arc-shaped hole that fits the shape of the arc-shaped corners of the FPC board.

[0014] Preferably, the pad body is made of copper.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By setting a cutting line on the pad body corresponding to a partition hole opened along the edge line of the FPC board, the cutter can separate the punched part from the pad body along the cutting line. Since the partition hole is set inward on the side close to the welding part, the contact area of ​​the cutter with the edge of the welding part is reduced during the cutting operation. In other words, the cutter only generates stress on the solid part between the partition holes, so that the stress of stamping and cutting on the overall edge of the welding part is reduced, effectively reducing the probability of warping of the pad edge, avoiding affecting the quality of ultrasonic welding, and while setting a large pad area to increase the welding strength, the product yield and production efficiency are also guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the soldering pad body of the present invention when it is spread on an FPC board.

[0019] Figure 2 This is a structural diagram of the present invention in which the pad body and the FPC board are separated.

[0020] The markings of the components in the accompanying drawings are as follows:

[0021] 1. FPC board; 2. Pad body; 21. Soldering part; 22. Punching part; 23. Partition hole; 24. Connecting part; 3. Cutting line. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. For the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not essential. In addition, to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0023] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, in this application, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or ranking, nor are they used to limit this application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0026] See also Figure 1 and Figure 2 The utility model discloses an ultrasonic welding punching anti-warping pad, comprising a pad body 2 whose spreading area is larger than the upper surface area of ​​an FPC board 1, wherein the contact portion of the pad body 2 with the FPC board 1 is a welding portion 21, and the portion of the pad body 2 extending beyond the edge of the FPC board 1 is a punching portion 22, a partition hole 23 is provided between the welding portion 21 and the punching portion 22, and the partition hole 23 forms a cutting line 3 along the outer edge of the FPC board 1, and the side of the partition hole 23 close to the welding portion 21 is retracted inward toward the center of the welding portion 21.

[0027] The number of the partition holes in the present invention can be one or more. In this embodiment, the number of the partition holes is multiple, and the cutting line is formed by the multiple partition holes arranged at intervals.

[0028] The utility model forms a cutting line 3 by setting partition holes 23 on the pad body 2 corresponding to the partition holes 23 opened along the edge line of the FPC board 1. The cutter can separate the punching portion 22 from the pad body 2 along the cutting line 3. Since the partition holes 23 are set inward on the side close to the welding portion 21, the contact area between the cutter and the edge of the welding portion 21 is reduced during the cutting operation. That is to say, the cutter only generates stress on the solid part between the partition holes 23, so that the stress of stamping and cutting on the overall edge of the welding portion 21 is reduced, effectively reducing the probability of the pad edge warping, avoiding affecting the quality of ultrasonic welding, and while setting a large pad area to increase the welding strength, the product yield and production efficiency are also guaranteed.

[0029] The welding portion 21, the punching portion 22 and the partition hole 23 in the embodiment of the present invention are integrally stamped. Compared with the large solder pad in the prior art, the embodiment of the present invention only adds a partition hole 23 at the pre-cutting position of the large solder pad. The newly added structure is simple and has a high degree of overlap with the production operation of the original product. Therefore, compared with the production process of the large solder pad in the prior art, the solder pad production process in this embodiment only requires a slight adjustment to its mold. The structural design of the present invention is ingenious, the process is mature, and the operation is simple, which avoids a substantial increase in production costs and is conducive to large-scale production.

[0030] In order to further reduce the influence of the punching force on the edge of the pad, the solid filling part of the cutting line 3 in the embodiment of the utility model is a plurality of connecting parts 24, and the length a of any one of the connecting parts 24 is less than the length b of any one of the partition holes 23. Since the overall length of the cutting line 3 is adapted to the edge length of the FPC board 1 and remains unchanged, the shorter the length of the connecting part 24, the longer the length of the partition hole 23, and the more the edge of the welding part 21 is retracted, so that the contact area between the cutter and the edge of the welding part 21 during the cutting operation is smaller, and the stress of the cutter on the connecting part 24 between the partition holes 23 is also smaller, thereby further reducing the probability of the edge of the pad being warped, and further improving the yield rate of the product.

[0031] A further technical solution is that the partition hole 23 is a long strip through hole, so that the side shape of the partition hole 23 is easier to fit the edge shape of the FPC board 1. Of course, in some embodiments, the partition hole 23 can also be set to a trapezoidal, triangular or other shape, as long as at least one side can fit the edge shape of the FPC board 1.

[0032] The shape of the end edge of the partition hole 23 in the embodiment of the present invention is an arc, and the cutting line 3 passes through the midpoint of the arc. For the partition holes 23 on the same side of the FPC board 1 (excluding the adjacent partition holes 23 at the corners), the shortest distance between adjacent partition holes 23 is the distance between the midpoints of two adjacent arcs. That is to say, when punching, the landing point of the cutter is located at the midpoint of the arc, that is, on the cutting line 3. By setting the end edge of the partition hole 23 to be an arc, the influence of the cutter force on the welding part 21 is further reduced.

[0033] In the embodiment of the present invention, the partition holes 23 at the ends of the cutting line 3 completely separate the connection between the welding portion 21 and the punching portion 22 along the extension direction of the end of the cutting line 3, so as to facilitate the punching portion 22 to fall more completely after punching, and further reduce the effective area of ​​the cutter.

[0034] In the embodiment of the present invention, the number of the partition holes 23 corresponding to the arc-shaped corners of the FPC board 1 on the cutting line 3 is at least one, and the shape of the partition holes is an arc-shaped hole that fits the shape of the arc-shaped corners of the FPC board 1. By providing at least one arc-shaped hole, the shape of the welding portion 21 at the arc-shaped corner of the FPC board 1 after punching is more closely fitted.

[0035] The pad body 2 in the embodiment of the present invention is made of copper. Copper has excellent electrical conductivity. Using copper as the material for the busbar pad can enable efficient transmission of electrons in the circuit, reduce power loss, and ensure the stability and reliability of the circuit.

[0036] The above description is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application fall within the scope of the technical solution of the present application.

Claims

1. An ultrasonic welding punching anti-warping pad, characterized by: The invention comprises a pad body (2) having a spreading area larger than the upper surface area of ​​an FPC board (1); the contact portion of the pad body (2) and the FPC board (1) is a welding portion (21); the portion of the pad body (2) extending beyond the edge of the FPC board (1) is a punching portion (22); a partition hole (23) is provided between the welding portion (21) and the punching portion (22); the partition hole (23) forms a cutting line (3) along the outer edge of the FPC board (1); and the partition hole (23) is retracted inwardly toward the center of the welding portion (21) on a side close to the welding portion (21).

2. The ultrasonic welding punching anti-warping pad according to claim 1, characterized in that: The welding portion (21), the punching portion (22) and the partition hole (23) are integrally stamped and formed.

3. The ultrasonic welding punched anti-warping pad according to claim 1, characterized in that: The cutting line (3) is formed by a plurality of partition holes (23) arranged at intervals.

4. The ultrasonic welding punched anti-warping pad according to claim 3, characterized in that: The solid filling portion of the cutting line (3) is a plurality of connecting portions (24), and the length a of any one of the connecting portions (24) is smaller than the length b of any one of the partition holes (23).

5. The ultrasonic welding punched anti-warping pad according to claim 4, characterized in that: The partition hole (23) is a long strip through hole.

6. The ultrasonic welding punched anti-warping pad according to claim 5, characterized in that: The shape of the end edge of the partition hole (23) is an arc, and the cutting line (3) passes through the midpoint of the arc.

7. The ultrasonic welding punched anti-warping pad according to claim 6, characterized in that: The isolation holes (23) at the ends of both sides of the cutting line (3) completely isolate the connection between the welding portion (21) and the punching portion (22) along the extension direction of the end of the cutting line (3).

8. The ultrasonic welding punched anti-warping pad according to claim 7, characterized in that: The number of the partition holes (23) on the cutting line (3) corresponding to the arc-shaped corners of the FPC board (1) is at least one, and the shape of the partition holes is an arc-shaped hole that fits the shape of the arc-shaped corners of the FPC board (1).

9. The ultrasonic welding punched anti-warping pad according to claim 1, characterized in that: The pad body (2) is made of copper.

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