A pressing mechanism for laser welding head

Abstract

The utility model relates to a pressing mechanism for a laser welding head, including a welding head fixing part, a sliding assembly, a power part, and an elastic fixing part; the welding head fixing part is fixedly connected to the upper part of the sliding assembly; the telescopic part of the power part is fixed to the side of the sliding assembly away from the laser welding head, so as to push the sliding assembly away from the laser welding head, or to be located directly below the laser welding head; the elastic fixing part is fixedly connected to the lower part of the sliding assembly to press the welding pad so that the laser welding head moves to the upper end of the elastic fixing part to heat the welding pad. Its beneficial effect is that the flexible connecting piece to be welded can be positioned and heated to perform the initial welding. At this time, the welding agent between the two layers of flexible connecting pieces is in a semi-melted state under the high temperature of the laser, and then the welding agent is positioned and heated for a second time using the laser welding head in combination with a focusing lens, thereby reducing the welding defect rate and effectively extending the service life of the flexible connecting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pressing mechanism for a laser welding head. Background Art

[0002] FPC is a soft circuit board, also known as a flexible circuit board or flexible circuit board, or soft board for short. It is flexible, light, thin and reliable. It can adapt to the complex structure and size limitations of automotive batteries and provide stable electrical connections.

[0003] Most FPCs are connected boards, and the yield rate of FPCs is relatively low. The welding process is crucial in the preparation of FPCs. Multiple flexible connecting sheets are stacked and welded to make FPCs. In the existing process, lasers are used to weld flexible connecting sheets without pre-pressing and positioning the connecting sheets, and the welding temperature is relatively high, which is a one-time welding finalization. During the welding process, the high laser temperature can easily melt all the tin powder at the solder joints, leading to flow, resulting in empty solder joints, continuous solder joints, and tin beads, with a high defect rate; for example, the flowing tin will flow into the holes of the flexible connecting sheet near the solder joints, resulting in tin on both sides of the flexible connecting sheet, which can easily burn the FPC in subsequent use, affecting safety and product life. Utility Model Content

[0004] The utility model aims at the technical problems existing in the prior art and provides a pressing mechanism for a laser welding head. The welding agent is located at the spot welding position and the defect rate is reduced.

[0005] The utility model provides a technical solution to the above-mentioned technical problems as follows: a pressing mechanism for a laser welding head, comprising a welding head fixing part, a sliding assembly, a power part, and an elastic fixing part; the welding head fixing part is fixedly connected to the upper part of the sliding assembly; the telescopic part of the power part is fixed to a side of the sliding assembly away from the welding head to push the sliding assembly away from the laser welding head, or to be located directly below the laser welding head; the elastic fixing part is fixedly connected to the lower part of the sliding assembly to press the welding pad so that the laser welding head moves to the upper end of the elastic fixing part to heat the welding pad.

[0006] As a further technical solution, the welding head fixing part includes a base and two "7"-shaped first fixing plates; the base is provided with a through hole through which the laser welding head passes, and the two first fixing plates are mirror-imaged on the upper end surface of the base and are located on both sides of the through hole; wherein the sliding assembly is fixed on both sides of the lower part of the base; the upper end surface of the power part is fixed to the lower end surface of the base.

[0007] As a further technical solution, the sliding assembly includes two baffles, two slide rails, and two sliders; the two baffles are symmetrically arranged on both sides of the base, the slide rails are adapted to be slidably connected to the sliders, and one side of the slide rails is fixedly connected to the inner wall of the baffles, and the other side is slidably connected to the sliders; wherein the side of the slider facing away from the slide rails is fixed to the elastic fixing member.

[0008] As a further technical solution, the elastic fixing member includes two first connecting plates, a second connecting plate, a third connecting plate, at least two elastic compression members, a fourth connecting plate, a mounting plate, and a pressed lens; the two first connecting plates are symmetrically arranged on the upper end surfaces on both sides of the second connecting plate, and the two first connecting plates are fixedly connected by the third connecting plate, so that the first connecting plate, the second connecting plate, and the third connecting plate are enclosed as a frame structure with the opening upward, and the first connecting plate is fixedly connected to the slider in parallel; the second connecting plate, the elastic compression member, the fourth connecting plate, the mounting plate The plates are connected in sequence from top to bottom, and the elastic compression member is vertically arranged between the second connecting plate and the fourth connecting plate, and the degree of compression of the pressing plate on the welding pad is controlled by adjusting the elastic compression member; the pressing lens is arranged on the mounting hole in the middle of the mounting plate; wherein the side of the third connecting plate facing away from the first connecting plate is fixedly connected to the telescopic part of the power member; the first connecting plate and the fourth connecting plate are both frame-shaped structures in cross-section, and share the longitudinal center line with the mounting plate, so that the laser welding head passes through the first connecting plate, the fourth connecting plate and the mounting plate in sequence and corresponds to the mounting hole.

[0009] As a further technical solution, the elastic compression part includes an elastic telescopic part, a connecting shaft, and a sleeve; the elastic telescopic part is sleeved outside the connecting shaft; a sleeve is provided at the upper and lower ends of the connecting shaft; wherein, the lower end of the connecting shaft extends out of the lower end surface of the fourth connecting plate and is locked and fixed by the sleeve, and the elastic telescopic part is located between the second connecting plate and the fourth connecting plate.

[0010] As a further technical solution, the elastic telescopic member is a telescopic spring.

[0011] As a further technical solution, the power part also includes a cylinder body, and the cylinder body is fixed to the side of the lower end surface of the base away from the first fixed plate; wherein, the piston rod on the cylinder body is fixedly connected to the telescopic part to push the telescopic part to drive the sliding assembly away from the laser welding head, or to be located directly below the laser welding head.

[0012] The beneficial effect of the utility model is that the flexible connecting sheet to be welded can be positioned and heated to perform the initial welding. At this time, the welding agent between the two layers of flexible connecting sheets is semi-melted under the high temperature of the laser. After that, the welding agent is positioned and a laser welding head is used in conjunction with a focusing lens to perform secondary heating on the welding agent to prevent the welding agent from flowing everywhere at high temperature or flowing into the holes on the flexible connecting sheet, thereby reducing the welding defect rate and effectively extending the service life of the flexible connecting sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a partial structural schematic diagram of the utility model, in which the base and the first fixing plate are removed;

[0015] Figure 3 It is a partial structural schematic diagram of the utility model, in which the base, the first fixing plate and the baffle on one side are removed;

[0016] Figure 4 It is a partial structural diagram of the utility model, in which the base, the first fixing plate, the baffle plate on one side and the slide rail are removed;

[0017] Figure 5 It is a partial structural schematic diagram of the utility model equipped with a laser welding head.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] Welding head fixing part 1, base 11, first fixing plate 12, through hole 13;

[0020] Sliding assembly 2, baffle 21, first protruding strip 211, slide rail 22, first concave slide groove 221, slider 23, second concave slide groove 231, second protruding strip 232;

[0021] Power member 3, telescopic part 31, cylinder body 32, piston rod 33;

[0022] Elastic fixing member 4, first connecting plate 41, second connecting plate 42, third connecting plate 43, elastic compression member 44, elastic telescopic member 441, connecting shaft 442, shaft sleeve 443, fourth connecting plate 45, mounting plate 46, mounting hole 461, fixing head 462, lens 47;

[0023] Laser welding head5. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0025] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. In order to enable any technician in the field to implement and use the utility model, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the utility model obscure. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0027] In order to increase the yield and service life of FPC during preparation, this embodiment provides a pressing mechanism for a laser welding head. Figure 1-Figure 5 , including a welding head fixing part 1, a sliding component 2, a power part 3, and an elastic fixing part 4; the welding head fixing part 1 is used to fix the laser welding head 5, so that the laser welding head 5 passes through the pressing mechanism, and the laser welding head 5 heats the solder on the pad after the pad is pressed by the pressing mechanism; in actual operation, the laser welding head 5 can be a single-focus coaxial temperature measurement imaging welding head produced by Yiweixin Optoelectronics, or it can be a coaxial laser soldering system coaxial welding head with model LWH-IMPY-FDL-k-F80 produced by Wuhan Songsheng Optoelectronics Technology Co., Ltd.; the characteristics are: the coaxial CCD camera and the monitoring device are coaxial for high-definition positioning of precision welded parts, temperature, CCD imaging, laser light source and other optical paths.

[0028] The welding head fixing member 1 is fixedly connected to the upper part of the sliding assembly 2; see Figure 1-Figure 3The telescopic part 31 of the power part 3 is fixed on the side of the sliding component 2 away from the welding head to push the sliding component 2 away from the laser welding head 5, or directly below the laser welding head 5. After the two pads with FPC soft tapes are spliced ​​and extruded, they are placed at the lower part of the pressing mechanism and aligned with the laser welding head 5; the elastic fixing part 4 is fixedly connected to the lower part of the sliding component 2 to press the pad so that the laser welding head 5 moves to the upper end of the elastic fixing part 4 to heat the pad; at this time, the sliding component 2 is pushed so that the elastic fixing part 4 fixes the pad, and the laser welding head 5 is turned on to perform laser heating on the pad twice, so that the solder between the pads melts to connect the pads together, and the solder does not flow into the holes near the soldering points, thereby reducing the defective rate and being safe and reliable.

[0029] In the specific implementation process, see Figure 1 , Figure 5 The welding head fixing part 1 includes a base 11 and two "7"-shaped first fixing plates 12; the base 11 is provided with a through hole 13 through which the laser welding head 5 passes; the two first fixing plates 12 are mirror-imaged on the upper end surface of the base 11 and are located on both sides of the through hole 13; the laser welding head 5 is fixed to the upper end of the base 11 and fixed through the first fixing plate 12; at this time, one end of the laser sheet provided on the laser welding head 5 passes through the through hole 13 for aligning the welding pad. Among them, the sliding component 2 is fixed to both sides of the lower part of the base 11; the upper end surface of the power member 3 is fixed to the lower end surface of the base 11.

[0030] In the specific implementation process, see Figure 1-Figure 5 The sliding assembly 2 includes two baffles 21, two slide rails 22, and two sliders 23; the two baffles 21 are symmetrically arranged on both sides of the base 11, the slide rails 22 are adapted to be slidably connected with the sliders 23, and one side of the slide rail 22 is fixedly connected to the inner side wall of the baffle 21, and the other side is slidably connected to the slider 23; wherein, the side of the slider 23 away from the slide rail 22 is fixed to the elastic fixing member 4, so that the elastic fixing member 4 slides along the slide rail 22 under the sliding of the slider 23.

[0031] For more details, see Figure 3 , Figure 4The baffle 21 is provided with a first protruding strip 211 along its length direction, and the base 11 and the slide rail 22 are respectively fixed to the upper and lower ends of the first protruding strip 211 on the same side of the baffle 21. Preferably, the base 11, the slide rail 22 and the baffle 21 are all screwed; the slide rail 22 is provided with a first concave groove 221 at the upper and lower ends along its length direction, and the slider 23 is provided with a second concave groove 231, and the upper and lower end surfaces of the second concave groove 231 are provided with a second protruding strip 232 slidably adapted to be connected with the first concave groove 221, the longitudinal section of the second protruding strip 232 is arc-shaped, and is arranged along the length direction of the slider 23. During the sliding process of the slider 23 and the slide rail 22, the second concave groove 231 partially wraps the slide rail 22, and at the same time, the second protruding strip 232 is located in the first concave groove 221 and slides.

[0032] In the specific implementation process, see Figure 1 , Figure 3 , Figure 4 The elastic fixing member 4 includes two first connecting plates 41, a second connecting plate 42, a third connecting plate 43, at least two elastic compression members 44, a fourth connecting plate 45, a mounting plate 46, and a pressed lens 47; the side of the slider 23 away from the slide rail 22 is fixedly connected to the first connecting plate 41, and one slider 23 corresponds to one first connecting plate 41. Preferably, the slider 23 is screwed to the first connecting plate 41.

[0033] The two first connecting plates 41 are symmetrically arranged on the upper end surfaces of both sides of the second connecting plate 42, and the two first connecting plates 41 are fixedly connected by the third connecting plate 43, so that the first connecting plate 41, the second connecting plate 42, and the third connecting plate 43 are enclosed into a frame structure with an opening upward, and the left side of the frame structure is also open. When the laser welding head 5 passes through the frame structure, it is convenient to observe through the left opening; and the first connecting plate 41 is fixedly connected to the slider 23 in parallel;

[0034] The second connecting plate 42, the elastic compression member 44, the fourth connecting plate 45, and the mounting plate 46 are connected in sequence from top to bottom, and the elastic compression member 44 is vertically arranged between the second connecting plate 42 and the fourth connecting plate 45, and the degree of compression of the mounting plate 46 on the pad is controlled by adjusting the elastic compression member 44; the pressing lens 47 is arranged on the mounting hole 461 in the middle of the mounting plate 46, and in the implementation process, a hole is opened in the middle of the pressing lens 47, so that the high-temperature laser emitted by the laser welding head 5 is irradiated onto the pad through the hole to control the heated area on the pad; further, in order to strengthen the focused laser fixed-point heating, the pressing lens 47 is a downward funnel shape. Among them, the side of the third connecting plate 43 away from the first connecting plate 41 is fixedly connected to the telescopic part 31 of the power member 3, and the third connecting plate 43 is pushed to move by the power member 3, thereby driving the slider 23 to slide along the slide rail 22. The first connecting plate 41 and the fourth connecting plate 45 are both frame-shaped structures in cross-section and share a longitudinal center line with the mounting plate 46, so that the welding head passes through the first connecting plate 41, the fourth connecting plate 45, and the mounting plate 46 in sequence and corresponds to the mounting hole 461, so that the welding head is aligned with the pressed lens 47 to control the heating range.

[0035] In the specific implementation process, see Figure 1-Figure 3 The power member 3 further includes a cylinder body 32, and the cylinder body 32 is fixed to the side of the lower end surface of the base 11 away from the first fixed plate 12; wherein the piston rod 33 on the cylinder body 32 is fixedly connected to the telescopic part 31, so as to push the telescopic part 31 to drive the sliding assembly 2 away from the laser welding head 5, or to be located directly below the laser welding head 5. The cylinder body 32, the piston rod 33, etc. here are prior arts, and their movement principle is not described in detail.

[0036] In the specific implementation process, see Figure 3 , Figure 4The elastic compression member 44 includes an elastic expansion member 441, a connecting shaft 442, and a sleeve 443; the elastic expansion member 441 is sleeved outside the connecting shaft 442; preferably, the elastic expansion member 441 is a telescopic spring. The upper and lower ends of the connecting shaft 442 are each provided with a sleeve 443, and by adjusting the fourth connecting plate 45 to move upward or downward along the connecting shaft 442, the elastic expansion member 441 is compressed or stretched to control the compression of the mounting plate 46 to the welding pad; and in order to further facilitate the adjustment of the compression, the lower end of the connecting shaft 442 extends out of the lower end surface of the fourth connecting plate 45 and is locked and fixed by the sleeve 443, and the elastic expansion member 441 is located between the second connecting plate 42 and the fourth connecting plate 45, that is, after adjusting the distance between the fourth connecting plate 45 and the second connecting plate 42, it is locked and fixed by the sleeve 443.

[0037] Further, see Figure 4 A fixing head 462 is provided at each of the four corners along the lower end surface of the mounting plate 46, which is used to press the welding pad and make the welding point on the welding pad located in the middle of the mounting plate 46 for easy welding; and the bottom of the shaft sleeve 443 provided at the lower part of the fourth connecting plate 45 is located above the bottom of the fixing head 462.

[0038] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0039] Although the preferred embodiments of the utility model have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pressing mechanism for a laser welding head, characterized in that: It comprises a welding head fixing part (1), a sliding component (2), a power part (3), and an elastic fixing part (4); The welding head fixing member (1) is fixedly connected to the upper part of the sliding assembly (2); The telescopic portion (31) of the power member (3) is fixed to a side of the sliding component (2) away from the laser welding head (5) so as to push the sliding component (2) away from the laser welding head (5) or to be located directly below the laser welding head (5); The elastic fixing member (4) is fixedly connected to the lower part of the sliding assembly (2) to press the welding pad so that the laser welding head (5) moves to the upper end of the elastic fixing member (4) to heat the welding pad.

2. A pressing mechanism for a laser welding head according to claim 1, characterized in that: The welding head fixing member (1) comprises a base (11) and two "7"-shaped first fixing plates (12); The base (11) is provided with a through hole (13) through which the laser welding head (5) passes, and the two first fixing plates (12) are arranged in a mirror-image manner on the upper end surface of the base (11) and are located on both sides of the through hole (13); The sliding assembly (2) is fixed to two sides of the lower part of the base (11); and the upper end surface of the power component (3) is fixed to the lower end surface of the base (11).

3. A pressing mechanism for a laser welding head according to claim 2, characterized in that: The sliding assembly (2) comprises two baffles (21), two slide rails (22), and two slide blocks (23); Two baffles (21) are symmetrically arranged on both sides of the base (11); the slide rail (22) is adapted to be slidably connected to the slider (23); one side of the slide rail (22) is fixedly connected to the inner side wall of the baffle (21) and the other side is slidably connected to the slider (23); Wherein, the side of the sliding block (23) facing away from the sliding rail (22) is fixed to the elastic fixing member (4).

4. A pressing mechanism for a laser welding head according to claim 3, characterized in that: The elastic fixing member (4) comprises two first connecting plates (41), a second connecting plate (42), a third connecting plate (43), at least two elastic compression members (44), a fourth connecting plate (45), a mounting plate (46), and a pressed lens (47); Two first connecting plates (41) are symmetrically arranged on upper end surfaces on both sides of the second connecting plate (42), and the two first connecting plates (41) are fixedly connected via the third connecting plate (43), so that the first connecting plate (41), the second connecting plate (42), and the third connecting plate (43) are enclosed to form a frame structure with an opening facing upward, and the first connecting plate (41) is fixedly connected to the sliding block (23) in parallel; The second connecting plate (42), the elastic compression member (44), the fourth connecting plate (45), and the mounting plate (46) are connected in sequence from top to bottom, and the elastic compression member (44) is vertically arranged between the second connecting plate (42) and the fourth connecting plate (45), and the degree of compression of the mounting plate (46) against the welding pad is controlled by adjusting the elastic compression member (44); The pressed lens (47) is arranged on a mounting hole (461) in the middle of the mounting plate (46); Wherein, a side of the third connecting plate (43) facing away from the first connecting plate (41) is fixedly connected to the telescopic portion (31) of the power member (3); The first connecting plate (41) and the fourth connecting plate (45) are both frame-shaped structures in cross section and share a longitudinal centerline with the mounting plate (46), so that the laser welding head (5) passes through the first connecting plate (41), the fourth connecting plate (45), and the mounting plate (46) in sequence and then corresponds to the mounting hole (461).

5. A pressing mechanism for a laser welding head according to claim 4, characterized in that: The elastic compression member (44) comprises an elastic telescopic member (441), a connecting shaft (442), and a shaft sleeve (443); The elastic telescopic member (441) is sleeved outside the connecting shaft (442); the upper and lower ends of the connecting shaft (442) are each provided with a shaft sleeve (443); The lower end of the connecting shaft (442) extends out of the lower end surface of the fourth connecting plate (45) and is locked and fixed by the shaft sleeve (443), and the elastic telescopic member (441) is located between the second connecting plate (42) and the fourth connecting plate (45).

6. A pressing mechanism for a laser welding head according to claim 5, characterized in that: The elastic telescopic member (441) is a telescopic spring.

7. The pressing mechanism for a laser welding head according to claim 2, characterized in that: The power component (3) further comprises a cylinder body (32), and the cylinder body (32) is fixed to a side of the lower end surface of the base (11) away from the first fixing plate (12); The piston rod (33) on the cylinder body (32) is fixedly connected to the telescopic portion (31) so as to push the telescopic portion (31) to drive the sliding component (2) away from the laser welding head (5) or to be located directly below the laser welding head (5).

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