Ultrasonic welding equipment

Abstract

The utility model discloses ultrasonic welding equipment which comprises a first support and a second support, a welding head and a first driving mechanism for driving the welding head to move are arranged on the first support, the second support and the first support are oppositely arranged, a welding seat is arranged on the second support, and the welding seat and the welding head are oppositely arranged. The ultrasonic welding equipment further comprises a pressure sensor, the pressure sensor is arranged between the welding head and the welding seat and electrically connected with the first driving mechanism, and the pressure sensor is used for monitoring the pressure value between the welding head and the welding seat and feeding back the pressure value to the first driving mechanism; the first driving mechanism is further used for controlling the welding head to move according to the pressure value monitored by the pressure sensor. Even if the welding head and the welding seat of the ultrasonic welding equipment are abraded, the pressure value between the welding head and the welding seat is monitored in real time through the pressure sensor, and the first driving mechanism is adjusted to move the welding head according to the change of the pressure value between the welding head and the welding seat; therefore, the pressure between the welding head and the welding seat is maintained in a stable numerical range.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to an ultrasonic welding device. Background Art

[0002] In the production process of lithium battery tab welding, the tab needs to be welded to the foil by ultrasonic welding. Ultrasonic welding uses the high-frequency oscillation of ultrasound to make two metal surfaces rub against each other under appropriate pressure to form a solid fusion between molecular layers.

[0003] The pressure between the welding head and the welding seat is a more important factor in the ultrasonic welding process. If the pressure between the welding head and the welding seat is insufficient, the pre-compression of the foil and the tab will not be sufficient, resulting in a cold weld between the foil and the tab, which seriously affects the quality of the battery cell. The ultrasonic welding equipment in the prior art usually uses a numerical control method to control the displacement of the welding head, that is, the welding head moves a fixed distance during each welding process according to the value input by the staff.

[0004] However, the high-frequency oscillation generated during the ultrasonic welding process may cause wear on the welding head and the welding seat, so that even if the welding head moves a preset distance under the control of the numerical control system, it is impossible to ensure sufficient pressure between the welding head and the welding seat. Utility Model Content

[0005] The main purpose of the utility model is to provide an ultrasonic welding device, aiming to solve the problem of poor welding effect caused by wear of the welding head and the welding seat.

[0006] To achieve the above-mentioned purpose, the utility model proposes an ultrasonic welding device, comprising a first bracket and a second bracket, the first bracket is provided with a welding head and a first driving mechanism for driving the welding head to move, the second bracket is arranged opposite to the first bracket, the second bracket is provided with a welding seat, and the welding seat and the welding head are arranged opposite to each other; wherein the ultrasonic welding device also includes:

[0007] A pressure sensor is disposed between the welding head and the welding base and is electrically connected to the first driving mechanism. The pressure sensor is used to monitor the pressure value between the welding head and the welding base and feed it back to the first driving mechanism.

[0008] The first driving mechanism is also used to control the movement of the welding head according to the pressure value monitored by the pressure sensor.

[0009] In some embodiments, the ultrasonic welding equipment also includes a displacement sensor, which is arranged between the welding head and the welding seat, and is used to monitor the movement distance of the welding head and transmit it to the first driving mechanism. The first driving mechanism is also used to control the movement of the welding head according to the distance value monitored by the displacement sensor.

[0010] In some embodiments, the ultrasonic welding equipment also includes an alarm, which is electrically connected to the pressure sensor and the displacement sensor, and is used to generate an alarm signal when the pressure value monitored by the pressure sensor is less than a first threshold or when the distance value monitored by the displacement sensor exceeds a second threshold.

[0011] In some embodiments, the ultrasonic welding equipment further includes a heating mechanism, which is disposed on the second bracket and adjacent to the welding seat, and is used to heat and increase the temperature of the welding seat.

[0012] In some embodiments, the ultrasonic welding device further comprises a roller mechanism, the roller mechanism comprising:

[0013] At least two guide rollers are located parallel to each other and at intervals on a side of the second bracket facing the first bracket, and the welding seat is located between two adjacent guide rollers;

[0014] A first mounting frame, for at least two guide rollers to be rotatably connected to the first mounting frame;

[0015] The second driving mechanism is arranged on the second bracket and is in driving connection with the first mounting frame. The second driving mechanism is used for driving the first mounting frame to lift and lower at least two guide rollers.

[0016] In some embodiments, the ultrasonic welding device further includes a rod lifting mechanism, and the rod lifting mechanism includes:

[0017] The rod body is located between two adjacent guide rollers and is parallel to the guide rollers;

[0018] A second mounting frame, for connecting the rod body to the second mounting frame;

[0019] The third driving mechanism is arranged on the second bracket and is in driving connection with the second mounting frame. The third driving mechanism is used to drive the second mounting frame to lift the rod body.

[0020] In some embodiments, a ventilation duct is formed in the rod body, and an air injection hole connected to the ventilation duct is opened on the side of the rod body. The rod lifting mechanism also includes an air supply device and an air pipe. One end of the air pipe is passed through the rod body to connect the official cavity of the air pipe and the ventilation duct, and the other end of the air pipe is connected to the air outlet of the air supply device.

[0021] In some embodiments, the second bracket includes a base and a first sliding seat slidably disposed on the base, and the first sliding seat can slide relative to the base in a horizontal direction;

[0022] The first sliding seat has a supporting surface facing the first bracket, and the heating mechanism and the welding seat are arranged on the supporting surface.

[0023] In some embodiments, a push handle is protruding from the first sliding seat, and the push handle is used to push the first sliding seat so that the first sliding seat slides relative to the base in a horizontal direction.

[0024] In some embodiments, the second bracket further includes a second sliding seat, which is slidably disposed on the base and arranged opposite to the first sliding seat in a horizontal direction, and the second driving mechanism and the third driving mechanism are installed on the second sliding seat.

[0025] Compared with the ultrasonic welding equipment in the prior art, even if the welding head and welding seat of the ultrasonic welding equipment of the utility model are worn, the ultrasonic welding equipment of the utility model monitors the pressure value between the welding head and the welding seat in real time through the pressure sensor, and adjusts the first driving mechanism to move the welding head according to the change of the pressure value between the welding head and the welding seat, so as to maintain the pressure between the welding head and the welding seat within a stable numerical range, thereby improving the welding effect of the ultrasonic welding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an ultrasonic welding device according to an embodiment of the utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the connection of the second bracket of the ultrasonic welding equipment and various mechanisms installed on the second bracket.

[0028] Description of Figure Numbers:

[0029] The first bracket 110, the second bracket 120, the base 121, the first sliding seat 122, the push handle 1221, the second sliding seat 123, the welding head 210, the welding seat 220, the first driving mechanism 300, the heating mechanism 400, the guide roller 510, the first mounting frame 520, the second driving mechanism 530, the rod body 610, the second mounting frame 620, and the third driving mechanism 630.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, bottom, side...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0034] In addition, the descriptions involving "first", "second", etc. in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0035] In view of the technical defects existing in the related art, this embodiment provides an ultrasonic welding device. Figure 1 As shown, the ultrasonic welding device of this embodiment includes a first bracket 110 and a second bracket 120. The first bracket 110 is provided with a welding head 210 and a first driving mechanism 300 for driving the welding head 210 to move, and the second bracket 120 is provided with a welding seat 220. The first bracket 110 and the second bracket 120 are arranged relative to each other, so that the welding seat 220 and the welding head 210 are arranged relative to each other.

[0036] The ultrasonic welding device of this embodiment further includes a pressure sensor. The pressure sensor is disposed between the welding head 210 and the welding seat 220 (not shown in the figure), and the pressure sensor is electrically connected to the first driving mechanism 300, that is, the pressure sensor and the first driving mechanism 300 can transmit signals, and this signal transmission mode can be wired transmission or wireless transmission.

[0037] In this embodiment, the pressure sensor is used to monitor the pressure value between the welding head 210 and the welding base 220, and feeds back the monitored pressure value data in real time to the first driving mechanism 300. The first driving mechanism 300 is also used to control the movement of the welding head 210 according to the pressure value monitored by the pressure sensor.

[0038] Exemplarily, the first driving mechanism 300 includes a servo motor and a first controller. The first controller is used to receive the real-time pressure value between the welding head 210 and the welding seat 220 transmitted by the pressure sensor.

[0039] In one case, the servo motor drives the welding head 210 to move to a preset distance under the control of the numerical control system, so as to pre-press the foil and the tab. When the welding head 210 completes the displacement, when the pressure value received by the first controller is 8kg, the first controller determines that the current pressure between the welding head 210 and the welding seat 220 meets the pre-pressing requirements of the foil and the tab, and thus controls the servo motor to stop driving the welding head 210 to move, so that the welding head 210 remains at the current position.

[0040] In another case, the servo motor drives the welding head 210 to move to a preset distance under the control of the numerical control system, so as to pre-press the foil and the tab. After the welding head 210 completes the displacement, due to the wear of the welding head 210 and the welding seat 220, when the pressure value received by the first controller is 7kg, the first controller determines that the current pressure between the welding head 210 and the welding seat 220 does not meet the pre-pressing requirements of the foil and the tab, and thus controls the servo motor to continue to drive the welding head 210 to move until the real-time pressure value between the welding head 210 and the welding seat 220 transmitted by the pressure sensor reaches 8kg.

[0041] In summary, even if the welding head 210 and the welding seat 220 of the ultrasonic welding equipment of the present embodiment are worn, the ultrasonic welding equipment of the present invention monitors the pressure value between the welding head 210 and the welding seat 220 in real time through the pressure sensor, and adjusts the first driving mechanism 300 to move the welding head 210 according to the change of the pressure value between the welding head 210 and the welding seat 220, so as to maintain the pressure between the welding head 210 and the welding seat 220 within a stable numerical range, thereby improving the welding effect of the ultrasonic welding equipment.

[0042] Furthermore, in the ultrasonic welding device, even if the numerical control system stores a preset value (such as 10 mm) of the displacement of the welding head 210, during the actual operation of the ultrasonic welding device, due to the error relationship in the structural dimensions, the actual movement distance of the welding head 210 is less than the preset value, resulting in the pressure value between the welding head 210 and the welding seat 220 not meeting the pre-pressure requirements of the foil and the tab. To address this problem, the ultrasonic welding device of this embodiment further includes a displacement sensor.

[0043] The displacement sensor is disposed between the welding head 210 and the welding base 220 (not shown in the figure), and is electrically connected to the first driving mechanism 300, that is, signal transmission can also be performed between the displacement sensor and the first driving mechanism 300. The displacement sensor is used to monitor the moving distance of the welding head 210 and transmit it to the first driving mechanism 300, and the first driving mechanism 300 is also used to control the movement of the welding head 210 according to the distance value monitored by the displacement sensor.

[0044] Exemplarily, the first driving mechanism 300 includes a servo motor and a first controller. The first controller is used to receive the moving distance of the welding head 210 transmitted by the displacement sensor.

[0045] In one case, the servo motor drives the welding head 210 to move to a preset distance under the control of the numerical control system, so as to pre-press the foil and the tab. When the welding head 210 completes the displacement, when the first controller receives the moving distance of the welding head 210 of 20 mm, the first controller determines that the current position of the welding head 210 is sufficient to make the pressure between the welding head 210 and the welding seat 220 meet the pre-pressing requirements of the foil and the tab, and thus controls the servo motor to stop driving the welding head 210 to move, so that the welding head 210 remains at the current position.

[0046] In another case, the servo motor drives the welding head 210 to move to a preset distance under the control of the numerical control system, so as to pre-press the foil and the tab. After the welding head 210 completes the displacement, due to the error in control or structural size, when the actual movement distance of the welding head 210 received by the first controller is 15 mm, the first controller determines that the current position of the welding head 210 is not enough to make the pressure between the welding head 210 and the welding seat 220 meet the pre-pressing requirements of the foil and the tab, and thus controls the servo motor to continue to drive the welding head 210 to move until the movement distance of the welding head 210 transmitted by the displacement sensor reaches 20 mm.

[0047] In summary, in the ultrasonic welding equipment of this embodiment, even if the moving distance of the welding head 210 is less than the preset value due to errors in control or structural dimensions, it does not affect the pre-pressing of the foil and the tab.

[0048] Furthermore, if the horn 210 or the welding seat 220 of the ultrasonic welding device is severely worn, even if the horn 210 is further driven to move, the pressure between the horn 210 and the welding seat 220 may be less than the pressure required for pre-pressing. In order to timely maintain the severely worn horn 210 or welding seat 220, the ultrasonic welding device of this embodiment also includes an alarm (not shown in the figure). The alarm is electrically connected to the pressure sensor and the displacement sensor, and the alarm is used to generate an alarm signal when the pressure value monitored by the pressure sensor is less than the first threshold value or when the distance value monitored by the displacement sensor exceeds the second threshold value.

[0049] Exemplarily, the alarm includes a speaker and a second controller for controlling the speaker, and the second controller is also electrically connected to the pressure sensor and the displacement sensor so as to be able to receive data transmitted by the pressure sensor and the displacement sensor.

[0050] In the ultrasonic welding device of this embodiment, when the data transmitted by the pressure sensor is less than the first threshold value (such as 8kg), the second controller activates the speaker to remind the staff to perform equipment maintenance and promptly replace the welding head 210 or the welding seat 220. Or when the data transmitted by the displacement sensor exceeds the second threshold value (such as 25mm), it means that the welding seat 220 is seriously worn, and the second controller will also activate the speaker to remind the staff to perform equipment maintenance, so that the ultrasonic welding device can maintain a relatively stable working state.

[0051] Furthermore, in order to improve the ultrasonic welding efficiency, as Figure 2 As shown, the ultrasonic welding device of this embodiment further includes a heating mechanism 400. The heating mechanism 400 is disposed on the second bracket 120 and includes a plurality of heating rods or heating wires adjacent to the welding seat 220. The heating mechanism 400 generates heat to increase the temperature of the welding seat 220 itself, thereby helping to improve the ultrasonic welding efficiency.

[0052] Further, in order to connect with the conveying mechanism of the foil, as Figure 2 As shown, the ultrasonic welding device of this embodiment further includes a roller mechanism, which includes two guide rollers 510 , a first mounting frame 520 and a second driving mechanism 530 .

[0053] The two guide rollers 510 are parallel to each other and spaced apart and are located on the side of the second bracket 120 facing the first bracket 110, and the welding seat 220 is located between the two guide rollers 510. Of course, more than two guide rollers 510 can be provided according to actual needs. When there are more than two guide rollers 510, the welding seat 220 is located between two adjacent guide rollers 510.

[0054] The first mounting frame 520 is provided for the two guide rollers 510 to be rotatably connected to the first mounting frame 520, and the second driving mechanism 530 is disposed on the second bracket 120 and is in transmission connection with the first mounting frame 520, and supports the first mounting frame 520 and the two guide rollers 510. The second driving mechanism 530 is used to drive the first mounting frame 520 to raise and lower the two guide rollers 510, so that the foil can be separated from the welding seat 220 after the foil and the tab are welded.

[0055] Furthermore, in order to reduce the risk of cracking of the foil due to heating after the ultrasonic welding equipment stops running, Figure 2 As shown, the ultrasonic welding device of this embodiment further includes a rod lifting mechanism, which includes a rod body 610 , a second mounting frame 620 and a third driving mechanism 630 .

[0056] The rod body 610 is located between the two guide rollers 510 and is parallel to the guide rollers 510. The second mounting frame 620 is connected to the rod body 610 and supports the rod body 610. The third driving mechanism 630 is disposed on the second bracket 120 and is in transmission connection with the second mounting frame 620. The third driving mechanism 630 is used to drive the second mounting frame 620 to lift the rod body 610, thereby lifting the foil through the rod body 610, so that the foil is away from the heating mechanism 400, thereby reducing the possibility of cracking of the foil due to heating.

[0057] Furthermore, in order to ensure that the foil can be separated from the welding seat 220 and reduce the dust adsorbed on the welding seat 220, a ventilation duct is formed in the rod body 610, and a gas injection hole connected to the ventilation duct is opened on the side of the rod body 610. The lifting rod mechanism also includes an air supply device and an air delivery pipe (not shown in the figure), one end of the air delivery pipe is passed through the rod body 610 to connect the official cavity of the air delivery pipe and the ventilation duct, and the other end of the air delivery pipe is connected to the air outlet of the air supply device, so that the airflow generated by the air supply device passes through the air delivery pipe and the ventilation duct in sequence, and is ejected from the gas injection hole on the side of the rod body 610, thereby blowing the foil to make it easy to separate from the welding seat 220, and also blowing away the dust on the welding seat 220, reducing the pollution of the foil or the pole ear, which is conducive to improving the welding effect of the subsequent welding process.

[0058] Furthermore, in order to flexibly adjust the relative position between the welding seat 220 and the welding head 210, as shown in FIG. Figure 2 As shown, in this embodiment, the second bracket 120 includes a base 121 and a first sliding seat 122 slidably disposed on the base 121. The first sliding seat 122 can slide relative to the base 121 in the horizontal direction. It should be noted that the horizontal direction refers to a direction parallel to the ground. The first sliding seat 122 has a support surface facing the first bracket 110, and the heating mechanism 400 and the welding seat 220 are disposed on the support surface.

[0059] In addition, in order to facilitate pushing the first sliding seat 122 , a push handle 1221 is protruded from the first sliding seat 122 , and the push handle 1221 is used to push the first sliding seat 122 so that the first sliding seat 122 slides relatively with the base 121 in a horizontal direction.

[0060] The second bracket 120 further includes a second sliding seat 123. The second sliding seat 123 is slidably disposed on the base 121 and arranged horizontally opposite to the first sliding seat 122. The second driving mechanism 530 and the third driving mechanism 630 are installed on the second sliding seat 123, so as to facilitate the assembly and subsequent disassembly of the ultrasonic welding equipment.

[0061] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. An ultrasonic welding device, comprising a first bracket and a second bracket, wherein the first bracket is provided with a welding head and a first driving mechanism for driving the welding head to move, the second bracket is arranged opposite to the first bracket, the second bracket is provided with a welding seat, and the welding seat is arranged opposite to the welding head; characterized in that: The ultrasonic welding equipment also includes: A pressure sensor is disposed between the welding head and the welding base and is electrically connected to the first driving mechanism, wherein the pressure sensor is used to monitor the pressure value between the welding head and the welding base and feed back the pressure value to the first driving mechanism; The first driving mechanism is also used to control the movement of the welding head according to the pressure value monitored by the pressure sensor.

2. The ultrasonic welding equipment according to claim 1, characterized in that: The ultrasonic welding equipment also includes a displacement sensor, which is arranged between the welding head and the welding seat and is electrically connected to the first driving mechanism. The displacement sensor is used to monitor the movement distance of the welding head and transmit it to the first driving mechanism. The first driving mechanism is also used to control the movement of the welding head according to the distance value monitored by the displacement sensor.

3. The ultrasonic welding equipment according to claim 2, characterized in that: It also includes an alarm, which is electrically connected to the pressure sensor and the displacement sensor, and is used to generate an alarm signal when the pressure value monitored by the pressure sensor is less than a first threshold or when the distance value monitored by the displacement sensor exceeds a second threshold.

4. The ultrasonic welding device according to any one of claims 1 to 3, characterized in that: The ultrasonic welding equipment further comprises a heating mechanism, which is disposed on the second bracket and adjacent to the welding seat, and is used to heat and increase the temperature of the welding seat.

5. The ultrasonic welding equipment according to claim 4, characterized in that: The ultrasonic welding equipment also includes a roller mechanism, and the roller mechanism includes: At least two guide rollers are located parallel to each other and at intervals on a side of the second bracket facing the first bracket, and the welding seat is located between two adjacent guide rollers; a first mounting frame, for the at least two guide rollers to be rotatably connected to the first mounting frame; The second driving mechanism is arranged on the second bracket and is in driving connection with the first mounting frame, and the second driving mechanism is used for driving the first mounting frame to lift and lower the at least two guide rollers.

6. The ultrasonic welding equipment according to claim 5, characterized in that: The ultrasonic welding device further includes a rod lifting mechanism, and the rod lifting mechanism includes: A rod body, located between two adjacent guide rollers and parallel to the guide rollers; A second mounting frame, for connecting the rod body with the second mounting frame; The third driving mechanism is arranged on the second bracket and is drivingly connected with the second mounting frame. The third driving mechanism is used to drive the second mounting frame to lift the rod body.

7. The ultrasonic welding equipment according to claim 6, characterized in that: A ventilation duct is formed in the rod body, and an air injection hole connected to the ventilation duct is opened on the side of the rod body. The lifting rod mechanism also includes an air supply device and an air pipe. One end of the air pipe is passed through the rod body to connect the official cavity of the air pipe and the ventilation duct, and the other end of the air pipe is connected to the air outlet of the air supply device.

8. The ultrasonic welding equipment according to claim 7, characterized in that: The second bracket includes a base and a first sliding seat slidably arranged on the base, and the first sliding seat can slide relative to the base in a horizontal direction; Wherein, the first sliding seat has a supporting surface facing the first bracket, and the heating mechanism and the welding seat are arranged on the supporting surface.

9. The ultrasonic welding device according to claim 8, characterized in that: A push handle is convexly provided on the first sliding seat, and the push handle is used to push the first sliding seat so that the first sliding seat slides relatively with the base in a horizontal direction.

10. The ultrasonic welding equipment according to claim 8, characterized in that: The second bracket further includes a second sliding seat, which is slidably disposed on the base and arranged opposite to the first sliding seat in a horizontal direction, and the second driving mechanism and the third driving mechanism are installed on the second sliding seat.

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