Ultrasonic welding device

Abstract

The utility model discloses an ultrasonic welding device. The device comprises a welding head and a pressing mechanism. The pressing mechanism comprises a shell, a pressing piece and an elastic telescopic piece, the shell is fixedly connected with the welding head, one end of the elastic telescopic piece is in sliding connection with the shell, the other end of the elastic telescopic piece is fixedly connected with the pressing piece, the shell and the pressing piece are provided with through holes allowing the welding head to penetrate through, and the welding head is partially located in the through holes. The problem that the performance and the reliability of the battery are affected due to the fact that the tab foil on the surface layer is shattered to be broken when the tab foil is welded through ultrasonic waves in the prior art is solved, the performance and the reliability of the battery are improved, and the device has the advantages of being simple in structure and convenient to operate.

Description

Technical Field

[0001] The present application belongs to the field of battery processing technology, and in particular relates to an ultrasonic welding device. Background Art

[0002] During the lithium battery production process, multiple layers of tab foil are welded to flexible connectors using ultrasonic welding. During ultrasonic welding, the ultrasonic welding head presses directly onto the multiple layers of tab foil. Because the surface of the multiple layers of tab foil is loose, the downward pressure of the welding head causes the foil in the weld area to dent and the foil at the edge of the weld area to warp. The ultrasonic waves are transmitted to the surface of the foil, causing it to vibrate passively at high frequencies, which can easily shatter the outermost tab foil and generate metal shavings. Metal shavings increase the self-discharge of the battery, shortening the battery life, or cause local short circuits in the battery, seriously affecting the battery's performance and reliability. Utility Model Content

[0003] The embodiments of the present application provide an ultrasonic welding device to solve the problem that the surface tab foil is shattered to produce metal chips, which affects the performance and reliability of the battery.

[0004] In a first aspect, an embodiment of the present application provides an ultrasonic welding device, comprising:

[0005] Welding head;

[0006] The clamping mechanism includes a shell, a clamping part and an elastic telescopic part. The shell is fixedly connected to the welding head. One end of the elastic telescopic part is slidably connected to the shell, and the other end is fixedly connected to the clamping part. The shell and the clamping part are provided with a through hole for the welding head to pass through, and the welding head is partially located in the through hole.

[0007] Optionally, the elastic telescopic part includes a connecting rod and a spring, one end of the connecting rod is slidingly connected to the shell, and the other end is fixedly connected to the clamping part, the spring is sleeved on the connecting rod, one end of the spring abuts against the shell, and the other end abuts against the clamping part.

[0008] Optionally, a plurality of the elastic telescopic parts are provided, and the plurality of the elastic telescopic parts are arranged at intervals along the circumference of the welding head.

[0009] Optionally, the pressing member includes a connecting frame and a pressing block, one side of the connecting frame is fixedly connected to the elastic telescopic member, and the other side is fixedly connected to the pressing block.

[0010] Optionally, the pressing block comprises a silicone material.

[0011] Optionally, a baffle is provided at one end of the shell close to the clamping member, the baffle is located between the elastic telescopic member and the pressure block, the baffle is located outside the connecting frame, the edge of the pressure block away from the through hole protrudes from the connecting frame, and the projection of the edge of the pressure block falls on the baffle.

[0012] Optionally, the welding head includes a working part and a connecting handle, the working part is installed on the connecting handle, the working part is provided with a working end face, the shell is sleeved on the working part, and the clamping mechanism also includes a bracket, which connects the shell and the connecting handle.

[0013] Optionally, the bracket includes a connecting plate and a clamping member, one end of the connecting plate is connected to the shell, and the other end is connected to the clamping member, and the clamping member is clamped and fixed to the connecting handle.

[0014] Optionally, the clamping member includes a first clamping plate and a second clamping plate arranged opposite to each other, a clamping space is formed between the first clamping plate and the second clamping plate, the connecting handle is located in the clamping space, and the first clamping plate and the second clamping plate are detachably connected via a locking structure.

[0015] Optionally, a mounting hole is formed between the first clamping plate and the second clamping plate, the connecting plate is located in the mounting hole, and the connecting plate is connected and fixed to the first clamping plate and the second clamping plate via the locking structure.

[0016] The ultrasonic welding device provided in the embodiment of the present application includes a welding head and a clamping mechanism, the clamping mechanism includes a shell, a clamping member and an elastic telescopic member, the shell is fixedly connected to the welding head, when the welding head moves, the clamping mechanism moves with the welding head as a whole, the shell and the clamping member are provided with a through hole for the welding head to pass through, one end of the elastic telescopic member is slidably connected to the shell, and the other end is fixedly connected to the clamping member, when ultrasonic welding is performed, the welding head is moved, and the side of the clamping member facing away from the shell is first fitted with the tab foil to be welded, and the welding head is continued to be moved to the welding position, and welding is completed. The position refers to the position where the welding head fits with the tab foil to be welded, the pressing part moves toward the shell side, the elastic telescopic part is compressed, and the elastic restoring force of the elastic telescopic part acts on the pressing part, so that the pressing part can press the tab foil to be welded, and the pressing part is pressed on the tab foil around the welding mark area to suppress the vibration of the tab foil, overcoming the problem of existing ultrasonic welding of tab foil, in which the surface tab foil is shattered to produce metal chips, which affects the performance and reliability of the battery, thereby improving the performance and reliability of the battery, and having the advantages of simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0018] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0019] Figure 1 A three-dimensional diagram of an ultrasonic welding device provided in an embodiment of the present application.

[0020] Figure 2 A sectional perspective view of an ultrasonic welding device provided in an embodiment of the present application.

[0021] Figure 3 A sectional perspective view of the clamping mechanism of the ultrasonic welding device provided in an embodiment of the present application.

[0022] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0023] Figure 5 A schematic diagram of a clamping member provided in an embodiment of the present application. 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 embodiments described 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 making creative efforts are within the scope of protection of this application.

[0025] The ultrasonic welding device provided in the embodiments of the present application solves the problem that conventional ultrasonic welding of tab foils causes the surface tab foil to be shattered, generating metal chips that affect battery performance and reliability. The device will be described below with reference to the accompanying drawings.

[0026] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, Figure 1 A three-dimensional diagram of an ultrasonic welding device provided in an embodiment of the present application, Figure 2 This is a sectional perspective view of the ultrasonic welding device provided in an embodiment of the present application. Figure 3 A sectional perspective view of the clamping mechanism of the ultrasonic welding device provided in an embodiment of the present application, Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0027] The ultrasonic welding device implemented in this application includes a welding head 100 and a clamping mechanism 200. In addition, the ultrasonic welding device also includes a generator and a transducer system. The generator generates a high-voltage, high-frequency signal, which is converted into high-frequency mechanical vibration of the welding head 100 through the transducer system. The generator and the energy-circulating system are not described in detail.

[0028] In this embodiment, see Figure 1 and Figure 2 As shown, the welding head 100 includes a working part 120 and a connecting handle 130. The working part 120 is installed on the connecting handle 130. The working part 120 is provided with a working end face 110. The working part 120 extends along a first direction and the connecting handle 130 extends along a second direction. The first direction is arranged perpendicular to the second direction, such as the first direction is the Y-axis direction and the second direction is the X-axis direction. The working part 120 is located at the end of the connecting handle 130.

[0029] In this embodiment, see Figure 1 、 Figure 3 Figure 4 As shown, the pressing mechanism 200 includes a shell 210, a pressing member 220 and an elastic telescopic member 230. The shell 210 is fixedly connected to the welding head 100. One end of the elastic telescopic member 230 is slidably connected to the shell 210, and the other end is fixedly connected to the pressing member 220. The shell 210 and the pressing member 220 are provided with a through hole 240 for the welding head 100 to pass through. The welding head 100 is partially located in the through hole 240, that is, the shell 210 and the pressing member 220 are sleeved on the working part 120. The working part 120 0 portion is located in the through hole 240, and a certain distance is separated between the working portion 120 and the shell 210 and the pressing member 220. In the welding position, the elastic telescopic member 230 is compressed, and the elastic restoring force of the elastic telescopic member 230 acts on the pressing member 220. The welding position refers to the position where the working end surface 110 of the working portion 120 is in contact with the tab foil to be welded. At this time, the working end surface 110 of the working portion 120 and the side of the pressing member 220 facing away from the shell 210 are located in the same plane.

[0030] It can be understood that in the initial state, the working end face 110 of the working part 120 is closer to the shell 210 than the pressing surface of the pressing part 220. At this time, the elasticity of the elastic telescopic part 230 is in a natural state. In the welding position, the working end face 110 of the working part 120 is in contact with the tab foil to be welded. At this time, the elastic telescopic part 230 is in a compressed state. The elastic restoring force of the elastic telescopic part 230 acts on the pressing part 220. The pressing part 220 presses the tab foil for welding. The pressing part 220 presses on the tab foil around the weld print area to suppress the vibration of the tab foil, improves the depression of the tab foil in the weld print area and the warping of the tab foil around the weld print area, overcomes the problem of existing ultrasonic welding of tab foil, in which the surface tab foil is shattered to produce metal chips, which affects the performance and reliability of the battery, improves the performance and reliability of the battery, and has the advantages of simple structure and easy operation.

[0031] In some embodiments, see Figure 4 As shown, the elastic telescopic member 230 includes a connecting rod 231 and a spring 232. One end of the connecting rod 231 is slidably connected to the shell 210, such as, an ear plate 212 is provided on the inner wall of the shell 210, one end of the connecting rod 231 passes through the ear plate 212, and the end of the connecting rod 231 is connected to a nut, which is movably connected to the ear plate 212. The other end of the connecting rod 231 is fixedly connected to the clamping member 220, and the spring 232 is sleeved on the connecting rod 231. One end of the spring 232 abuts against the shell 210, such as one end of the spring 232 abuts against the ear plate, and the other end of the spring 232 abuts against the clamping member 220.

[0032] It can be understood that in the process of reaching the welding position, the connecting rod 231 moves toward the side of the ear plate 212, the connecting rod 231 drives the clamping piece 220 to move, the spring 232 is compressed, and the elastic restoring force of the spring 232 always acts on the clamping piece 220. During the welding process, the clamping piece 220 can always clamp the tab foil to be welded. The elastic telescopic piece 230 has a simple structure, and the clamping force of the clamping piece 220 can be automatically adjusted by the spring 232 to ensure that the clamping force is of appropriate size and to avoid overpressure damage to the tab foil.

[0033] In some embodiments, see Figure 3 and Figure 4 As shown, a plurality of elastic telescopic parts 230 are provided, and the plurality of elastic telescopic parts 230 are arranged at circumferential intervals along the welding head 100, that is, the elastic telescopic parts 230 are arranged at circumferential intervals along the working part 120, and the distances between adjacent elastic telescopic parts 230 may be the same or different, such as 6 elastic telescopic parts 230 are provided.

[0034] It can be understood that in this embodiment, multiple elastic telescopic parts 230 are provided. At the welding position, the multiple elastic telescopic parts 230 are all in a compressed state. The elastic restoring force of the multiple elastic telescopic parts 230 acts on the clamping part 220, so that the pressure of each part of the clamping part 220 is relatively uniform, and the force exerted by the clamping part 220 on the tab foil to be welded is uniform, which further improves the welding effect of the tab foil.

[0035] In some embodiments, see Figure 3 As shown, the pressing member 220 includes a connecting frame 221 and a pressing block 222 . The connecting frame 221 has a first end and a second end. The first end is fixedly connected to one end of the elastic member 230 , and the second end is fixedly connected to the pressing block 222 .

[0036] In this embodiment, the connecting frame 221 is a square frame structure. The first end of the connecting frame 221 is provided with a protruding flange connection plate. The end of the connecting rod 231 of the elastic expansion member 230 is fixedly connected to the flange connection plate. The pressing block 222 is also a square frame structure. The second end of the connecting frame 221 and a side surface of the pressing block 222 can be fixed by gluing. The connecting frame 221 connects the pressing block 222 and the elastic expansion member 230 to ensure the flatness of the side of the pressing block 222 that contacts the tab foil to be welded, thereby preventing the pressing block 222 from scratching the tab foil.

[0037] In the above embodiment, the pressing block 222 includes a silicone material.

[0038] As will be appreciated, the pressing block 222 is made of silicone material, or the side of the pressing block 222 that contacts the tab foil is coated with silicone material. During the ultrasonic vibration welding process, the pressing block 222 always adheres to the surface of the tab foil, pressing the multiple layers of tab foil, preventing vibration of the surface tab foil, and improving the welding effect. The second-phase silicone material is softer, preventing the pressing block 222 from scratching the tab foil.

[0039] In some embodiments, see Figure 3 As shown, a baffle 211 is provided at one end of the shell 210 close to the clamping member 220. The baffle 211 is located between the elastic telescopic member 230 and the pressure block 222. The baffle 211 is located on the outside of the connecting frame 221. The edge of the side of the pressure block 222 away from the through hole 240 protrudes from the connecting frame 221, and the projection of the edge of the pressure block 222 falls on the baffle 211.

[0040] It can be understood that in this embodiment, the baffle 211 is arranged between the elastic telescopic member 230 and the pressure block 222. When the pressure block 222 moves to the extreme position toward the side of the shell 210, the baffle 211 is in contact with the pressure block 222. The baffle 211 limits the maximum stroke of the pressure block 222, prevents the elastic telescopic member 230 from being over-pressurized, protects the elastic telescopic member 230, and improves the reliability of the elastic telescopic member 230.

[0041] On the basis of the above embodiment, the shape of the baffle 211 is adapted to the shape of the shell 210, such as the shell 210 is a shell 210 with a rectangular cross-section, and the corresponding baffle 211 is also a hollow square plate. The baffle 211 and the shell 210 are detachably connected by bolts, and along the circumference of the working part 120, the contact area between the baffle 211 and the pressure block 222 is large.

[0042] As a variation, the baffle 211 is an arc-shaped plate or a rectangular plate, etc., and at least one baffle 211 is provided at the end of the shell 210 , which can also achieve the purpose of blocking the pressing block 222 .

[0043] In some embodiments, see Figure 1 As shown, the pressing mechanism 200 further includes a bracket 250 , which connects the housing 210 and the connecting handle 130 .

[0044] The clamping mechanism 200 and the welding head 100 form a detachable structure through the bracket 250. The clamping mechanism 200 can be used with different welding heads 100 and has a wide range of applications.

[0045] Based on the above implementation, see Figure 1 As shown, the bracket 250 includes a connecting plate 251 and a clamping member 252. The connecting plate 251 is bent. One end of the connecting plate 251 is connected to the shell 210, and the connecting plate 251 is fixedly connected to the shell 210. The other end of the connecting plate 251 is connected to the clamping member 252, and the clamping member 252 is clamped and fixed to the connecting handle 130. The clamping member 252 and the connecting handle 130 are detachably connected.

[0046] It can be understood that in this embodiment, the pressing mechanism 200 is detachably connected to the connecting handle 130 via the clamping member 252 , and the square plate pressing mechanism 200 is assembled with the welding head 100 , which is easy to operate.

[0047] Based on the above implementation, see Figure 1 and Figure 5 As shown, Figure 5 A schematic diagram of the clamping member provided in an embodiment of the present application, the clamping member 252 includes a first clamping plate 2521 and a second clamping plate 2522 arranged opposite to each other, the first clamping plate 2521 and the second clamping plate 2522 are connected to form a clamping space 2523, the connecting handle 130 is located in the clamping space 2523, and the first clamping plate 2521 and the second clamping plate 2522 are detachably connected through a locking structure.

[0048] In this embodiment, see Figure 5As shown, the first clamping plate 2521 and the second clamping plate 2522 each include two connecting sections and a curved section located between the connecting sections. Pin holes are set on the connecting sections. When the first clamping plate 2521 and the second clamping plate 2522 are docked, the connecting section of the first clamping plate 2521 fits with the connecting section of the second clamping plate 2522 and is fixedly connected by pins. The curved section of the first clamping plate 2521 and the curved section of the second clamping plate 2522 form a clamping space 2523. The clamping member 252 adopts the first clamping plate 2521, the second clamping plate 2522 and the locking structure to facilitate installation operation. The clamping space 2523 has a certain adjustment space and can be suitable for welding heads 100 of different specifications.

[0049] Based on the above implementation, see Figure 1 and Figure 5 As shown, a mounting hole 2524 is formed between the first clamping plate 2521 and the second clamping plate 2522 , and the connecting plate 251 is located in the mounting hole 2524 . The connecting plate 251 is connected and fixed to the first clamping plate 2521 and the second clamping plate 2522 via a locking structure.

[0050] It can be understood that a U-shaped hole is provided on a connecting section of the first splint 2521 and the second splint 2522, and the connecting sections of the first splint 2521 and the second splint 2522 are butt-jointed to form a mounting hole 2524, and one end of the connecting plate 251 is located in the mounting hole 2524. The connecting plate 251, the first splint 2521 and the second splint 2522 are fixed together by a locking structure, and the structure is compact.

[0051] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0053] The ultrasonic welding device provided in the embodiment of the present application is introduced in detail above. 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, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. An ultrasonic welding device, characterized in that: include: Welding head (100); The clamping mechanism (200) comprises a shell (210), a clamping member (220) and an elastic member (230), wherein the shell (210) is fixedly connected to the welding head (100), one end of the elastic member (230) is slidably connected to the shell (210), and the other end is fixedly connected to the clamping member (220), and the shell (210) and the clamping member (220) are provided with a through hole (240) for the welding head (100) to pass through, and a portion of the welding head (100) is located in the through hole (240).

2. The ultrasonic welding device according to claim 1, characterized in that: The elastic telescopic member (230) comprises a connecting rod (231) and a spring (232); one end of the connecting rod (231) is slidably connected to the housing (210), and the other end is fixedly connected to the pressing member (220); the spring (232) is sleeved on the connecting rod (231); one end of the spring (232) is in contact with the housing (210), and the other end is in contact with the pressing member (220).

3. The ultrasonic welding device according to claim 1, characterized in that: A plurality of the elastic and retractable members (230) are provided, and the plurality of the elastic and retractable members (230) are arranged at intervals along the circumference of the welding head (100).

4. The ultrasonic welding device according to claim 1, characterized in that: The pressing member (220) comprises a connecting frame (221) and a pressing block (222); one side of the connecting frame (221) is fixedly connected to the elastic telescopic member (230), and the other side of the connecting frame (221) is fixedly connected to the pressing block (222).

5. The ultrasonic welding device according to claim 4, characterized in that: The pressing block (222) comprises a silicone material.

6. The ultrasonic welding device according to claim 4, characterized in that: A baffle (211) is provided at one end of the shell (210) close to the pressing member (220); the baffle (211) is located between the elastic telescopic member (230) and the pressing block (222); the baffle (211) is located outside the connecting frame (221); an edge of one side of the pressing block (222) away from the through hole (240) protrudes from the connecting frame (221), and a projection of the edge of the pressing block (222) falls on the baffle (211).

7. The ultrasonic welding device according to any one of claims 1 to 6, characterized in that: The welding head (100) comprises a working part (120) and a connecting handle (130), wherein the working part (120) is mounted on the connecting handle (130), the working part (120) is provided with a working end surface (110), the shell (210) is sleeved on the working part (120), and the clamping mechanism (200) further comprises a bracket (250), wherein the bracket (250) connects the shell (210) and the connecting handle (130).

8. The ultrasonic welding device according to claim 7, characterized in that: The bracket (250) comprises a connecting plate (251) and a clamping member (252); one end of the connecting plate (251) is connected to the housing (210), and the other end is connected to the clamping member (252); the clamping member (252) is clamped and fixed to the connecting handle (130).

9. The ultrasonic welding device according to claim 8, characterized in that: The clamping member (252) includes a first clamping plate (2521) and a second clamping plate (2522) that are arranged opposite to each other, a clamping space (2523) is formed between the first clamping plate (2521) and the second clamping plate (2522), the connecting handle (130) is located in the clamping space (2523), and the first clamping plate (2521) and the second clamping plate (2522) are detachably connected via a locking structure.

10. The ultrasonic welding device according to claim 9, characterized in that: A mounting hole (2524) is formed between the first clamping plate (2521) and the second clamping plate (2522), the connecting plate (251) is located in the mounting hole (2524), and the connecting plate (251) is connected and fixed to the first clamping plate (2521) and the second clamping plate (2522) via the locking structure.

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