Ultrasonic torque welding alignment and welding detection device

Abstract

The utility model relates to an ultrasonic torque welding alignment and welding detection device which comprises a clamping air cylinder used for clamping a steel shell, ultrasonic torque welding equipment, an infrared distance measuring sensor and a moving part, the moving part is used for driving the steel shell to linearly move in the X direction and the Y direction, and a welding needle of the ultrasonic torque welding equipment and infrared rays emitted by the infrared distance measuring sensor are located on the Y-direction moving path of the steel shell. The moving part is further used for driving the steel shell to move in the X direction and the Y direction according to information of the infrared distance measuring sensor so that the center hole of the roll core can be coaxial with infrared rays emitted by the infrared distance measuring sensor. According to the utility model, the position of the central hole of the roll core is found and determined by using an infrared detection technology, the manufacturing cost of equipment can be reduced, the position of a steel shell is corrected to meet the welding positioning requirement, the rejection rate in the production process of the roll core is reduced, and the detection of the diaphragm state before welding and the detection of the welding effect after welding can be completed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and manufacturing, in particular to an ultrasonic torque welding alignment and welding detection device. Background Technique

[0002] Since cylindrical batteries have advantages such as high safety, simple production processes, and low production costs compared to traditional square aluminum shell batteries and soft-pack batteries, they have been regarded as a trend in the future development of the lithium battery industry. The production processes and production equipment for cylindrical batteries are also constantly evolving and updating.

[0003] During the production process of cylindrical batteries, it is necessary to weld the battery current collector plate and the steel shell pole column to form an electrical connection. This process can use an ultrasonic torque welding device to complete the welding of the positive current collector plate and the pole column. During the welding process, since ultrasonic torque welding requires inserting the welding needle through the central hole of the core after the core is inserted into the shell, the core diameter needs to be 1 mm smaller than the inner diameter of the steel shell to ensure normal insertion into the shell. After clamping the steel shell by the clamping cylinder, centering positioning is achieved. However, since the core diameter is smaller than the steel shell diameter, the core shakes inside the steel shell and is prone to positional displacement. In order to ensure the volumetric energy density of a single cell, the diameter R of the central hole of the core needs to be controlled to be less than 6 mm. In order to ensure the over-current capacity of the cell, the welding area needs to be as large as possible. The welding area is related to the diameter r of the welding needle, and the diameter r of the welding needle < R - 0.5 mm. During the needle insertion process, the allowable positioning error of the core is ±0.25 mm. If the positioning error between the welding needle and the central hole exceeds ±0.25 mm, it will cause damage to the surface of the electrode sheet during the pressing process of the welding needle, resulting in the scrapping of the cell. At the same time, if the diaphragm in the central hole of the core collapses, the needle insertion process will pull the diaphragm, resulting in the scrapping of the core; after welding, it is necessary to indirectly judge whether the welding is completed according to the pressing stroke of the welding needle, and the welding effect cannot be directly detected.

[0004] In the prior art, when detecting the insertion of the core into the shell, the steel shell is positioned and welded by the clamping cylinder, and then the position of the central hole of the core inside the steel shell is detected by the CCD detection technology. The positioning accuracy of the cylinder is ±0.5 mm. This process cannot ensure the positioning of the core in the steel shell and cannot meet the requirement of ±0.25 mm for welding positioning, easily resulting in welding failure and core scrapping. Moreover, the use of CCD detection technology has a high cost. At the same time, due to the relatively deep central hole of the core, the CCD detection technology cannot detect the state of the diaphragm inside the core, and it is necessary to visually inspect whether the diaphragm in the central hole of the core collapses manually, with low efficiency. Content of the Utility Model

[0005] Based on this, in view of the technical problems that the current detection of the position of the central hole of the core inside the steel shell by the CCD detection technology has a high cost and it is necessary to visually inspect whether the diaphragm in the central hole of the core collapses manually with low efficiency, the utility model provides an ultrasonic torque welding alignment and welding detection device.

[0006] An ultrasonic torque welding alignment and welding detection device proposed by the utility model includes a clamping cylinder for clamping a steel shell and an ultrasonic torque welding device. A winding core is provided inside the steel shell. The device further includes an infrared distance sensor and a moving member. The moving member is used to drive the steel shell to perform linear movement in the X direction and the Y direction. The welding needle of the ultrasonic torque welding device and the infrared ray emitted by the infrared distance sensor are both located on the Y-direction movement path of the steel shell. The moving member is further used to drive the steel shell to move in the X direction and the Y direction according to the information of the infrared distance sensor so that the central hole of the winding core is coaxial with the infrared ray emitted by the infrared distance sensor.

[0007] The ultrasonic torque welding alignment and welding detection device proposed by the utility model uses infrared detection technology to replace CCD detection technology to find and determine the position of the central hole of the winding core, which can reduce the manufacturing cost of the equipment. The infrared ray emitted by the infrared distance sensor and the welding needle of the ultrasonic torque welding device are both located on the movement path of the steel shell. First, the clamping cylinder is used to center and position the steel shell, and then the position of the steel shell is corrected under the action of the infrared distance sensor and the moving member to ensure that the winding core inside the steel shell is coaxial with the infrared ray of the infrared distance sensor. When the moving member drives the steel shell to move under the ultrasonic torque welding device, the winding core inside the steel shell can just be coaxial with the welding needle of the ultrasonic torque welding device, so as to meet the welding positioning requirements, and can meet the ±0.25mm requirements for the welding positioning of the welding needle and the central hole of the winding core, reducing the scrap rate in the production process of the winding core. At the same time, the state of the diaphragm can be detected before welding and the welding effect can be detected after welding through the infrared distance sensor, strengthening the quality monitoring of the production process.

[0008] As a further improvement of the above solution of the utility model, the moving member includes an X-direction moving slide and a Y-direction moving slide. The Y-direction moving slide is installed on the slider of the X-direction moving slide, and the clamping cylinder is installed on the slider of the Y-direction moving slide.

[0009] As a further improvement of the above solution of the utility model, the moving member further includes a base, the base is installed on the slider of the Y-direction moving slide, and the clamping cylinder is installed on the base.

[0010] As a further improvement of the above solution of the utility model, the ultrasonic torque welding alignment and welding detection device further includes a mounting table, and the X-direction moving slide is installed on the mounting table.

[0011] As a further improvement of the above solution of the utility model, the ultrasonic torque welding alignment and welding detection device further includes a mounting frame, the mounting frames are all installed on the mounting table, and the infrared distance sensor is installed on the mounting frame.

[0012] As a further improvement of the above solution of the utility model, the ultrasonic torque welding device is installed on the mounting table.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The ultrasonic torque welding alignment and welding detection device proposed by the utility model uses infrared detection technology to replace CCD detection technology to find and determine the position of the center hole of the core, which can reduce the manufacturing cost of the equipment; the infrared distance sensor and the welding needle of the ultrasonic torque welding equipment are both located on the moving path of the steel shell. First, the clamping cylinder is used to center the steel shell, and then the position of the steel shell is corrected under the action of the infrared distance sensor and the moving part to ensure that the core in the steel shell is coaxial with the infrared ray of the infrared distance sensor. When the moving part drives the steel shell to move under the ultrasonic torque welding equipment, the core in the steel shell can just be coaxial with the welding needle of the ultrasonic torque welding equipment, so as to meet the welding positioning requirements, and can meet the requirement of ±0.25mm for the welding positioning of the welding needle and the center hole of the core, reducing the scrap rate in the production process of the core; at the same time, the infrared distance sensor can complete the detection of the diaphragm state before welding and the detection of the welding effect after welding, strengthening the quality monitoring of the production process. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of an ultrasonic torque welding alignment and welding detection device proposed by an embodiment of the utility model;

[0016] Figure 2 It is a partial enlarged view of an ultrasonic torque welding alignment and welding detection device proposed by an embodiment of the utility model.

[0017] Reference numerals: 1, clamping cylinder; 2, ultrasonic torque welding equipment; 3, infrared distance sensor; 4, welding needle; 5, X-direction moving slide; 6, Y-direction moving slide; 7, base; 8, mounting table; 9, mounting frame; 10, steel shell; 11, core. Detailed Embodiment

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] In this embodiment, aiming at the technical problems that the current detection of the position of the center hole of the inner winding core of the steel shell by CCD detection technology has a large cost and requires manual visual inspection to determine whether the diaphragm of the center hole of the winding core collapses, with low efficiency, an ultrasonic torque welding alignment and welding detection device is provided. The infrared detection technology is used to replace the CCD detection technology to find and determine the position of the center hole of the winding core, which can reduce the manufacturing cost of the equipment and solve the positioning problem of the winding core and the welding needle.

[0020] Referring to Figure 1 、 Figure 2 , the ultrasonic torque welding alignment and welding detection device of this embodiment includes a clamping cylinder 1, an ultrasonic torque welding device 2, an infrared distance sensor 3 and a moving member, and may also include a mounting table 8 and a mounting frame 9.

[0021] The moving member includes an X-direction moving slide 5, a Y-direction moving slide 6 and a base 7. The X-direction moving slide 5 is installed on the mounting table 7 and arranged along the X direction. The Y-direction moving slide 6 is installed on the slider of the X-direction moving slide 5 and arranged along the Y direction. Driven by the X-direction moving slide 5, the Y-direction moving slide 6 can perform reciprocating movement in the X direction. It should be noted that the X direction and the Y direction in this embodiment are perpendicular to each other. The base is installed on the slider of the Y-direction moving slide 6. Driven by the Y-direction moving slide 6, the base 7 can perform reciprocating movement in the Y direction.

[0022] The clamping cylinder 1 is installed on the base 7. The clamping cylinder 1 is used to clamp the steel shell 10, and the winding core 11 is placed inside the steel shell 10. The steel shell 10 clamped by the clamping cylinder 1 can move in the X direction and the Y direction driven by the moving member. The clamping cylinder 1 of this embodiment adopts the existing technology, and the clamping jaw of the clamping cylinder 1 adopts a profiling design to ensure that the steel shell is clamped and centered.

[0023] The mounting bracket 9 is mounted on the mounting table 8, and the infrared ranging sensor 3 is mounted on the mounting bracket 9. The infrared rays emitted by the infrared ranging sensor 3 are located on the Y-direction movement path of the steel shell 10 clamped by the clamping cylinder 1. That is to say, under the action of the moving part, the steel shell 10 clamped by the clamping cylinder 1 can move below the infrared ranging sensor 3. The infrared ranging sensor 3 in this embodiment adopts the existing technology. The working principle of the infrared ranging sensor 3 is based on the emission and reception of infrared signals. It works through an infrared signal emitting diode and a receiving diode. The emitting tube emits infrared signals with a specific frequency. When these signals encounter an obstacle, they will be reflected back and captured again by the receiving diode. By processing the reflected signals, the infrared ranging sensor 3 can calculate the distance of the object. When the steel shell 10 moves below the infrared ranging sensor 3, since there is a core 11 with a central hole in the steel shell 10, if the central hole of the core 11 is not coaxial with the infrared rays emitted by the infrared ranging sensor 3, the distance measured by the infrared ranging sensor 3 is the distance between the infrared ranging sensor 3 and the end face of the core 11. At this time, the X-direction moving slide 5 drives the Y-direction moving slide 6 to move according to the distance signal fed back by the infrared ranging sensor 3 until the infrared rays emitted by the infrared ranging sensor 3 are coaxial with the central hole of the core 11. At this time, the infrared rays emitted by the infrared ranging sensor 3 pass through the central hole of the core 11 and reach the bottom steel shell 10 of the core 11. At this time, the distance measured by the infrared ranging sensor 3 is the distance between the bottom steel shell 10 of the core 11 and the infrared ranging sensor 3. At this time, the position of the steel shell 10 is adjusted, and the central hole of the core 11 in the steel shell 10 is coaxial with the infrared rays emitted by the infrared ranging sensor 3. At the same time, according to the data detected by the infrared ranging sensor 3, it is also possible to judge whether the internal diaphragm of the core 11 has collapsed. If the internal diaphragm has collapsed, the infrared rays will first reach the diaphragm and cannot reach the position of the bottom steel shell of the core 11, and the distance detected by the infrared ranging sensor 3 is less than the distance between the bottom steel shell 10 of the core 11 and the infrared ranging sensor 3.

[0024] The ultrasonic torque welding device 2 is mounted on the mounting table 8, and the welding needle 4 of the ultrasonic torque welding device 2 is located on the Y-direction movement path of the steel shell 10 clamped by the clamping cylinder 1. That is, it is necessary to ensure that the connection line between the welding needle 4 of the ultrasonic torque welding device 2 and the infrared rays emitted by the infrared ranging sensor 3 is in the Y-direction. In this way, under the action of the moving part, the steel shell 10 with the position adjusted can move below the welding needle 4 and the central hole of the core 11 is coaxial with the welding needle 4. At this time, the welding needle 4 passes through the central hole of the core 11 to weld the positive current collector and the pole column. The ultrasonic torque welding device 2 in this embodiment adopts the existing technology and is a device that uses ultrasonic technology for welding. By converting high-frequency electrical energy into mechanical energy, it generates high-frequency vibration, causing friction and heat on the contact surfaces of two or more metal or plastic parts, thereby achieving welding.

[0025] Through the above structural design, the following working principle is adopted in this embodiment:

[0026] Place the cylindrical steel shell 10 with the core 11 on the base 7. The clamping cylinder 1 clamps the steel shell 10 in the center. The Y-direction moving slide 6 operates to move the steel shell 10 under the infrared ranging sensor 3. The X-direction moving slide 5 adjusts the position of the steel shell 10 according to the information of the infrared ranging sensor 3 and judges whether the diaphragm collapses. If the distance measured by the infrared ranging sensor 3 is equal to the distance between the bottom of the steel shell of the core 11 and the infrared ranging sensor 3, it indicates that the diaphragm does not collapse and the central hole of the core 11 is coaxial with the infrared ranging sensor 3. The Y-direction moving slide 6 drives the X-direction moving slide 5 to move a predetermined distance, so that the steel shell 10 moves under the welding needle 4, and then the welding needle 4 presses down to complete the torque welding operation. After completing the ultrasonic torque welding, the Y-direction moving slide 6 drives the X-direction moving slide 5 to move in the reverse direction by a predetermined distance, and the steel shell 10 returns under the infrared ranging sensor 3. The distance between the bottom of the core and the infrared ranging sensor 3 is detected again by the infrared ranging sensor 3, and the distance difference before and after welding is compared to obtain the welding condition of the positive current collector plate and the pole column.

[0027] It should be noted that when a component is referred to as being "mounted on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there may be an intermediate component at the same time.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0029] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0030] The above-described embodiments only represent several implementation manners of this utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of this utility model, several modifications and improvements can still be made, and these all belong to the protection scope of this utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An ultrasonic torque welding alignment and welding detection device, comprising a clamping cylinder (1) for clamping a steel shell and an ultrasonic torque welding device (2), wherein the steel shell has a winding core, characterized in that: It also includes an infrared distance sensor (3) and a moving part; the moving part is used to drive the steel shell to move linearly in the X direction and the Y direction, the welding needle (4) of the ultrasonic torque welding device (2) and the infrared rays emitted by the infrared distance sensor (3) are both located on the Y-direction moving path of the steel shell, and the moving part is also used to drive the steel shell to move in the X direction and the Y direction according to the information of the infrared distance sensor (3) so that the central hole of the winding core is coaxial with the infrared rays emitted by the infrared distance sensor (3).

2. The ultrasonic torque welding alignment and welding detection device according to claim 1 is characterized in that: The moving part comprises an X-direction moving slide (5) and a Y-direction moving slide (6), wherein the Y-direction moving slide (6) is mounted on a slider of the X-direction moving slide (5), and the clamping cylinder (1) is mounted on the slider of the Y-direction moving slide (6).

3. The ultrasonic torque welding alignment and welding detection device according to claim 2 is characterized in that: The moving part also includes a base (7), the base (7) is installed on a slider of a Y-direction moving slide table (6), and the clamping cylinder (1) is installed on the base (7).

4. The ultrasonic torque welding alignment and welding detection device according to claim 2, characterized in that: The ultrasonic torque welding alignment and welding detection device also includes a mounting platform (8), and the X-direction movable slide (5) is mounted on the mounting platform (8).

5. The ultrasonic torque welding alignment and welding detection device according to claim 4 is characterized in that: The ultrasonic torque welding alignment and welding detection device also includes a mounting frame (9), the mounting frame (9) is mounted on the mounting platform (8), and the infrared distance measuring sensor (3) is mounted on the mounting frame (9).

6. The ultrasonic torque welding alignment and welding detection device according to claim 4, characterized in that: The ultrasonic torque welding device (2) is installed on a mounting platform (8).

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