Battery tab weld mark nondestructive testing equipment

Abstract

The utility model belongs to battery detection technical field discloses a kind of battery tab welding mark nondestructive testing equipment, the battery tab welding mark nondestructive testing equipment includes object table, ultrasonic transmitter and ultrasonic receiver, the object table is used to place battery tab to be measured;The ultrasonic transmitter is movably arranged above the object table, the ultrasonic transmitter has the first position close to the object table and the second position away from the object table, in the first position, the ultrasonic transmitter is used to emit pulse wave to the battery tab on the object table;The ultrasonic receiver is used to receive the pulse wave that the ultrasonic transmitter emits to the battery tab.This detection equipment can realize the nondestructive testing of battery tab welding mark, and detection accuracy is high, reduce the circulation of battery false welding, welding leakage and other welding defective battery, improve the safety performance of battery.

Description

Technical Field

[0001] This utility model belongs to the field of battery testing technology, specifically relating to a non-destructive testing device for battery tab solder marks. Background Technology

[0002] Lithium-ion battery tabs frequently experience issues like incomplete or missed welds during the welding process. Furthermore, the lack of significant fluctuations in welding machine parameters such as energy and pressure makes it impossible to assess the welding condition of the battery tabs. This can easily lead to defective batteries being transferred to subsequent processes, causing batch-wide battery anomalies. Generally, manual visual inspection and image inspection methods are used to inspect battery tab weld marks. However, manual visual inspection relies heavily on the long-term experience and skill level of the inspectors, making it prone to missed inspections and visual fatigue. It can only detect external weld defects, not internal issues like incomplete or missed welds. Similarly, image inspection can only inspect the appearance of the weld marks, not the internal welding condition. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a non-destructive testing device for battery tab solder marks.

[0004] The first aspect of this utility model provides a non-destructive testing device for battery tab solder marks, comprising: A stage for placing the tabs of the battery to be tested; An ultrasonic transmitter is movably disposed above the platform. The ultrasonic transmitter has a first position close to the platform and a second position away from the platform. In the first position, the ultrasonic transmitter is used to emit pulse waves to the battery tabs on the platform. An ultrasonic receiver is used to receive pulse waves emitted by the ultrasonic transmitter toward the battery tab.

[0005] The battery tab solder joint non-destructive testing equipment provided by this utility model has a simple structure. It uses an ultrasonic transmitter and an ultrasonic receiver to perform non-destructive testing of battery tab solder joints. It can detect the internal and external welding conditions of battery tabs, with high accuracy. It reduces the circulation of batteries with poor solder joints, missing solder joints or other welding defects, and improves the safety performance of batteries.

[0006] In some embodiments, the ultrasonic transmitter moves linearly within a preset plane, which is parallel to the plane on which the stage is located.

[0007] In some embodiments, the ultrasonic transmitter is a transmissive ultrasonic transmitter, and the ultrasonic receiver is disposed on a stage. The pulse wave emitted by the transmissive ultrasonic transmitter toward the battery tab passes through the battery tab and is received by the ultrasonic receiver.

[0008] In some embodiments, the ultrasonic transmitter is a reflective ultrasonic transmitter, and the ultrasonic receiver is disposed above the stage. The pulse wave emitted by the reflective ultrasonic transmitter toward the battery tab is reflected by the battery tab and received by the ultrasonic receiver.

[0009] In some embodiments, there are multiple ultrasonic transmitters, which are spaced apart on the same plane, and the plane of each ultrasonic transmitter is parallel to the plane of the stage.

[0010] In some embodiments, a first support member is provided on the outer side of the stage, and a linear drive device is fixed on the first support member. The linear drive device is fixedly connected to the ultrasonic transmitter, and the linear drive device is used to drive the ultrasonic transmitter to move linearly in a direction parallel to the plane of the stage.

[0011] In some embodiments, a CCD detector is also provided above the stage, and the imaging range of the CCD at least covers the battery tabs on the stage.

[0012] In some embodiments, the stage is provided with second support members on both sides along the first direction, a third support member is fixed between the second support members, the CCD detector is disposed on the third support member, and at least one lighting lamp is disposed on the third support member.

[0013] In some embodiments, the bottom of the platform is provided with a slide rail extending along a second direction, the platform is slidably connected to the slide rail, and the second direction is arranged to intersect with the first direction.

[0014] In some embodiments, the nondestructive testing equipment further includes a controller, wherein the signal output terminal of the ultrasonic receiver is electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the signal input terminals of the linear drive device and the CCD detector, respectively.

[0015] In some embodiments, the nondestructive testing equipment further includes an alarm, and the signal output terminal of the controller is electrically connected to the signal input terminal of the alarm.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 An exemplary structural diagram of the non-destructive testing equipment for battery tab solder marks provided in this application embodiment; Figure 2 An exemplary structural diagram of a battery provided in an embodiment of this application; Figure 3 This is a control architecture diagram of a battery tab solder joint non-destructive testing device provided in an embodiment of this application.

[0018] In the above diagram: 10 Stage; 20 Ultrasonic transmitter; 30 Ultrasonic receiver; 40 First support; 50 Linear drive device; 60 CCD detector; 70 Lighting lamp; 80 Second support; 90 Third support; 100 Controller; 110 Alarm; 120 Battery tab; 121 Solder mark. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0022] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0023] In the description of this specification, the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0025] Tab welding refers to the ultrasonic welding of the internal electrode core (a foil coated with active material) to the external tabs (usually conductive leads made of metals such as nickel or aluminum) of the battery cell. Ultrasonic welding is an indispensable step in lithium battery production, and the post-weld inspection (121) of the weld mark is a point of great concern. Because incomplete or missing welds frequently occur during the welding process, and the energy and pressure parameters of the welding machine do not fluctuate significantly, it is impossible to determine the quality of the battery weld. This can easily lead to defective batteries being transferred to subsequent processes or causing batch anomalies. Incomplete or missing welds can cause increased internal resistance, capacity decay, and decreased charge / discharge performance, and in severe cases, may even lead to safety accidents such as short circuits, leakage, and fires.

[0026] Currently, manual visual inspection and image inspection are used to inspect the solder marks 121 on the battery tabs 120. Manual visual inspection relies heavily on the long-term experience and skill level of the inspectors; inexperienced personnel can easily miss subtle weld defects. Furthermore, prolonged manual inspection can lead to visual fatigue, affecting the inspection results. Moreover, manual visual inspection can only detect external welding defects and cannot identify internal issues such as incomplete or missing welds. While image inspection does not rely on manual inspection, it also only inspects the appearance of the solder marks 121 and cannot detect internal welding conditions.

[0027] To solve the above problems, the first aspect of this utility model refers to... Figure 1 and Figure 2 A non-destructive testing device for battery tab solder marks is provided, comprising: Stage 10, which is used to place the battery tabs 120 to be tested; An ultrasonic transmitter 20 is movably disposed above the stage 10. The ultrasonic transmitter 20 has a first position close to the stage 10 and a second position away from the stage 10. In the first position, the ultrasonic transmitter 20 is used to emit pulse waves to the battery tabs 120 on the stage 10. An ultrasonic receiver 30 is used to receive pulse waves emitted by the ultrasonic transmitter 20 to the battery tab 120.

[0028] Specifically, the ultrasonic transmitter 20 is positioned directly above or diagonally above the stage 10. When the ultrasonic transmitter 20 moves to the side closer to the stage 10 and reaches the first position, it emits pulse waves towards the battery tab 120 to be tested placed on the stage 10. The pulse wave refers to the ultrasonic transmitter 20 emitting ultrasonic waves in the form of pulses, which are received by the ultrasonic receiver 30. The ultrasonic transmitter 20 and the ultrasonic receiver 30 work together to complete the ultrasonic non-destructive testing of the solder mark 121 of the battery tab 120. The ultrasonic non-destructive testing does not directly contact the solder mark 121 area of ​​the battery tab 120, so it will not damage the battery tab 120. It can accurately and efficiently detect the battery tab 120 for defects such as poor soldering and missing soldering, reducing the risk of defective products such as unqualified soldering flowing out.

[0029] In this example, when the ultrasonic transmitter 20 moves to the side away from the stage 10 and moves to the second position, the subsequent use of the CCD detector 60 to inspect the solder mark 121 of the battery tab 120 can avoid interference from the ultrasonic transmitter 20 to the CCD detector 60.

[0030] The non-destructive testing equipment for battery tab solder marks provided in this application embodiment has a simple structure. It uses the cooperation of an ultrasonic transmitter 20 and an ultrasonic receiver 30 to complete the non-destructive testing of the solder marks 121 on the battery tab 120. It can detect the internal and external welding conditions of the battery tab 120, with high detection accuracy. It reduces the circulation of batteries with poor soldering, missing soldering or other welding defects, and improves the safety performance of the battery. It is suitable for the detection of solder marks 121 on the battery tab 120, such as the detection of solder marks 121 on the tab 120 of a soft-pack battery, and further, the tab 120 of a soft-pack lithium battery.

[0031] In some embodiments, the ultrasonic transmitter 20 moves linearly within a preset plane, which is parallel to the plane on which the stage 10 is located.

[0032] Specifically, the ultrasonic transmitter 20 can move linearly within a preset plane parallel to the plane of the stage 10. The distance between the preset plane and the plane of the stage 10 can be set according to the detection requirements of the ultrasonic transmitter 20 for the battery tab solder marks on the stage 10. The direction of linear movement of the ultrasonic transmitter 20 within the preset plane can be set according to actual needs. For example, the ultrasonic transmitter 20 can move linearly laterally, longitudinally, or in any direction between the lateral and longitudinal directions within the preset plane.

[0033] In some implementations, reference Figure 1 The ultrasonic transmitter 20 is a transmission type ultrasonic transmitter, and the ultrasonic receiver 30 is disposed on the stage 10. The pulse wave emitted by the transmission type ultrasonic transmitter to the battery tab 120 passes through the battery tab 120 and is received by the ultrasonic receiver 30.

[0034] Specifically, a transmission-type ultrasonic transmitter is located on the stage 10, and the battery tab 120 is placed on the transmission-type ultrasonic transmitter on the stage 10. The pulse wave emitted by the transmission-type ultrasonic transmitter can pass through the battery tab 120 and be received by the ultrasonic receiver 30. The ultrasonic receiver 30 determines the condition of the solder joint 121 of the battery tab 120 based on the received pulse wave signal, and determines whether the battery tab 120 is well soldered. For a high-quality battery tab 120 solder joint 121, the received ultrasonic pulse wave signal has low energy loss, strong signal, and low waveform distortion. The echo of the initial pulse sent by the ultrasonic transmitter 20 can be clearly seen, and the time from pulse wave transmission to reception is relatively consistent.

[0035] The ultrasonic receiver 30 extracts feature values ​​from the received pulse wave signal, such as calculating the amplitude (energy), penetration time, and frequency spectrum of the received signal. The calculated feature values ​​are compared with a standard threshold range, which can be established based on test data from known good battery tab 120 solder mark 121 samples. If the calculated signal amplitude is within the standard threshold range and the penetration time is within the acceptable range, it indicates that the battery tab 120 solder mark 121 under test is good; otherwise, the battery tab 120 under test has defects such as poor soldering, missing solder, or over-soldering. For example, if the waveform of the pulse wave signal received by the ultrasonic receiver 30 is consistent with the waveform of a normal battery tab 120 solder mark 121, it indicates that the battery tab 120 solder mark 121 is good.

[0036] In some embodiments, the ultrasonic transmitter 20 is a reflective ultrasonic transmitter, and the ultrasonic receiver 30 is disposed above the stage 10. The pulse wave emitted by the reflective ultrasonic transmitter toward the battery tab 120 is reflected by the battery tab 120 and received by the ultrasonic receiver 30.

[0037] Specifically, both the reflective ultrasonic transmitter and the ultrasonic receiver 30 are located above the stage 10, spaced apart. The pulse wave emitted by the reflective ultrasonic transmitter is reflected by the battery tab 120 and received by the ultrasonic receiver 30. The ultrasonic receiver 30 determines the welding condition of the solder mark 121 on the battery tab 120 based on the received pulse wave. For products with good solder mark 121 on the battery tab 120, most of the pulse signal emitted by the ultrasonic transmitter 20 will continue to propagate downwards after passing through the battery tab 120, and the signal strength received by the ultrasonic receiver 30 will be weak; conversely, if the received ultrasonic signal strength is strong, it indicates that the solder mark 121 on the battery tab 120 is unqualified.

[0038] In some implementations, reference Figure 1 There are multiple ultrasonic transmitters 20, and the multiple ultrasonic transmitters 20 are arranged at intervals on the same plane. The plane where each ultrasonic transmitter (20) is located is parallel to the plane where the stage (10) is located.

[0039] Specifically, multiple ultrasonic transmitters 20 are spaced apart on a plane parallel to the plane of the stage. For example, the multiple ultrasonic transmitters 20 can be arranged in a row or in an array on the same plane. The row arrangement can be horizontal or vertical, and the array arrangement can be circular, with an ultrasonic transmitter 20 at the center of the circle. The pulse wave emitted by the multiple ultrasonic transmitters 20 covers at least the area of ​​the battery tab 120 solder mark 121, achieving full coverage detection of the area of ​​the battery tab 120 solder mark 121, ensuring that all positions of the tab solder mark 121 can be detected, and improving the accuracy of the detection of the battery tab 120 solder mark 121.

[0040] In some implementations, reference Figure 1 A first support member 40 is also provided on the outer side of the platform 10. A linear drive device 50 is fixed on the first support member 40. The linear drive device 50 is fixedly connected to the ultrasonic transmitter 20. The linear drive device 50 is used to drive the ultrasonic transmitter 20 to move linearly in a direction parallel to the plane of the platform 10.

[0041] Specifically, the first support member 40 can be a support rod, and a linear drive device 50 is fixedly mounted on the upper part of the support rod. The linear drive device 50 includes an electric push rod, a lead screw motor, a pneumatic cylinder, etc. The output end of the linear drive device 50 is fixedly connected to each ultrasonic transmitter 20 to drive each ultrasonic transmitter 20 to move linearly in a direction perpendicular to the plane of the stage 10, thereby giving each ultrasonic transmitter 20 a first position close to or diagonally above the stage 10, and a second position away from the stage 10. For example, the output end of the linear drive device 50 is fixed to a support plate, and the ultrasonic transmitters 20 are arranged in a row at intervals or in an array and fixed to the support plate.

[0042] In some implementations, reference Figure 1 A CCD detector 60 is also provided above the stage 10, and the imaging range of the CCD covers at least the battery tabs 120 on the stage 10.

[0043] Specifically, using the image sensor of the CCD detector 60, the light signal of the battery tab 120 solder mark 121 area acquired through the optical lens is converted into an electrical signal. After computer image processing and analysis, quantitative measurement results of the appearance, size, position and other information of the battery tab 120 solder mark 121 are obtained. Based on the CCD detection results, non-destructive testing of the battery tab 120 solder mark 121 can be achieved.

[0044] In this example, the CCD detector 60 is positioned above the stage 10. When the ultrasonic transmitter 20 is in the first position, it is preferentially used in conjunction with the ultrasonic receiver 30 to perform non-destructive testing of the solder marks 121 on the battery tabs 120. When the ultrasonic transmitter 20 is in the second position, the CCD detector 60 is used to perform non-destructive testing of the solder marks 121 on the battery tabs 120. This example demonstrates how the combination of ultrasonic non-destructive testing and CCD detector 60 non-destructive testing forms a comprehensive quality inspection loop for the solder marks 121 on the battery tabs 120, from the inside out and from the macroscopic to the microscopic level. This achieves automated testing of the solder marks 121, significantly improving production quality and reliability. Furthermore, it identifies batteries with abnormal solder marks 121 and alerts operators, improving testing efficiency and reliability.

[0045] In some implementations, reference Figure 1 The stage 10 is provided with second support members 80 on both sides along the first direction, and a third support member 90 is fixed between the second support members 80. The CCD detector 60 is disposed on the third support member 90, and at least one lighting lamp 70 is also disposed on the third support member 90.

[0046] Specifically, the stage 10 has second support members 80 on both sides, one of which is on the same side as the first support member 40. Each second support member 80 can be a support column. A third support member 90 is provided between the two second support members 80. The third support member 90 can be an arched rod, and the CCD detector 60 is fixedly mounted on the arched rod. The cooperation of the second and third support members 80 provides support and fixation for the CCD detector 60. The second support member 80 can be a telescopic rod to adjust the height of the CCD detector 60 to meet the inspection requirements of different battery tab 120 solder marks 121. The CCD detector 60 can also slide on the third support member 90 so that its camera is directly facing the solder mark 121 area of ​​the battery tab 120. For example, the third support member 90 has a groove, and the CCD detector 60 has a slider that matches the groove for fine-tuning the position of the CCD detector 60.

[0047] The third support member 90 is also equipped with multiple lighting lamps 70. When the third support member 90 is an arched member, the multiple lighting lamps 70 are spaced apart on the arched member; or, when the third support member 90 is a support plate, the multiple lighting lamps 70 are arranged in an array on the support plate. The lighting lamps 70 are positioned away from the CCD detector 60. The lighting lamps 70 can assist the CCD detector 60 in capturing clear images of the battery tabs 120, thereby improving the accuracy of the detection of the solder marks 121 on the battery tabs 120.

[0048] In some embodiments, the bottom of the platform 10 is provided with a slide rail extending along a second direction, and the platform 10 is slidably connected to the slide rail, wherein the second direction intersects with the first direction.

[0049] Specifically, the bottom sides of the stage 10 are provided with pulleys that match the slide rail. The stage 10 can slide along the slide rail in the second direction, which facilitates the stage 10 to transport the battery tabs 120 to the bottom of the ultrasonic transmitter 20 for tab soldering 121 inspection. The second direction is intersecting the first direction, preferably perpendicular to it.

[0050] In some implementations, reference Figure 1 and Figure 3 The non-destructive testing equipment also includes a controller 100. The signal output terminal of the ultrasonic receiver 30 is electrically connected to the signal input terminal of the controller 100. The signal output terminal of the controller 100 is electrically connected to the signal input terminals of the linear drive device 50 and the CCD detector 60, respectively.

[0051] Specifically, the controller 100 can be a computer system with computing and data processing capabilities. The signal received by the ultrasonic receiver 30 is transmitted to the controller 100. The controller 100 can perform data analysis and processing on the signal received by the ultrasonic receiver 30, thereby determining the welding status of the solder mark 121 on the battery tab 120 under test, and realizing automated detection and result output of the solder mark 121 on the battery tab 120.

[0052] When the stage 10 transports the battery tab 120 to the preset detection position, the controller 100 can control the linear drive device 50 to start, so that the ultrasonic transmitter 20 moves to the first position to emit pulse signals to the solder mark 121 of the battery tab 120. The ultrasonic receiver 30 can receive the pulse signals transmitted or reflected by the battery tab 120 and send them to the controller 100. If the controller 100 determines that the battery tab 120 is welded normally according to the pulse signal received by the ultrasonic receiver 30, the controller 100 can continue to send a start signal to the CCD detector 60 so that the CCD detector 60 can further perform auxiliary detection on the solder mark 121 of the battery tab 120 to further determine whether the battery tab 120 is welded well. If the controller 100 determines that the battery tab 120 is welded abnormally according to the pulse signal received by the ultrasonic receiver 30, then there is no need to perform the detection by the CCD detector 60, and the abnormality of the battery tab 120 is directly determined.

[0053] It should be noted that a position sensor, such as an infrared sensor, can be installed at the bottom of the side wall of the second support member 80. The signal output terminal of the infrared sensor is electrically connected to the signal input terminal of the controller 100. The infrared sensor can be used to determine whether the stage 10 has moved to the preset detection position. If the stage 10 moves to the preset detection position, the controller 100 automatically controls the linear drive device 50 to start so that the ultrasonic transmitter 20 moves to the first position, thereby realizing the automated detection of the battery tab 120 solder mark 121.

[0054] In some implementations, reference Figure 3 The non-destructive testing equipment also includes an alarm 110, and the signal output terminal of the controller 100 is electrically connected to the signal input terminal of the alarm 110.

[0055] Specifically, if the controller 100 determines that the battery tab 120 is abnormally welded based on the pulse signal received by the ultrasonic receiver 30, the controller 100 directly controls the alarm 110 to issue an alarm message. The alarm message can be an audible alarm, a flashing light, etc., to remind the operator to promptly send the abnormal battery into the non-conforming product (NG) box.

[0056] The method of using the non-destructive testing equipment for battery tab solder marks provided in this application embodiment includes: The welded battery tabs 120 are transferred to the stage 10, and the stage 10 is moved to the preset detection position. The linear drive device 50 drives the ultrasonic transmitter 20 to move to the first position above the stage 10. The ultrasonic transmitter 20 emits pulse waves to the solder mark 121 area of ​​the battery tab 120 on the stage 10. The pulse waves are received by the ultrasonic receiver 30 after passing through the battery tab 120 or being reflected by the battery tab 120. The ultrasonic receiver 30 receives the pulse wave signal and sends it to the controller 100. The controller 100 compares the pulse wave signal received by the ultrasonic receiver 30 with the signal of a known defect-free sample to determine whether the welding effect of the battery tab 120 under test is within the standard threshold range. If it is, the welding of the battery tab 120 under test is deemed qualified; otherwise, the welding of the battery tab 120 under test is deemed abnormal, and the controller 100 controls the alarm 110 to issue an alarm message so that the operator can put the abnormal battery into the NG box, and the battery tab 120 with abnormal welding will not be inspected by the CCD detector 60.

[0057] After the ultrasonic test is completed, the linear drive device 50 drives the ultrasonic transmitter 20 to move to the second position away from the stage 10. If the ultrasonic test shows that the welding of the battery tab 120 is qualified, the controller 100 controls the CCD detector 60 to take pictures of the dimensions of the weld mark 121 of the battery tab 120 for online inspection, to further determine whether the battery tab 120 is well welded. The qualified battery tab 120 is transferred to the next work, and the unqualified battery is placed in the NG box.

[0058] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A non-destructive testing device for battery tab solder marks, characterized in that, include: Stage (10), which is used to place the battery tabs (120) to be tested. An ultrasonic transmitter (20) is movably disposed above the stage (10). The ultrasonic transmitter (20) has a first position close to the stage (10) and a second position away from the stage (10). In the first position, the ultrasonic transmitter (20) is used to emit pulse waves to the battery tabs (120) on the stage (10). An ultrasonic receiver (30) is used to receive pulse waves emitted by the ultrasonic transmitter (20) to the battery tab (120).

2. The non-destructive testing equipment for battery tab solder marks according to claim 1, characterized in that, The ultrasonic transmitter (20) moves linearly within a preset plane, which is parallel to the plane on which the stage (10) is located.

3. The non-destructive testing equipment for battery tab solder marks according to claim 1, characterized in that, The ultrasonic transmitter (20) is a transmissive ultrasonic transmitter, and the ultrasonic receiver (30) is disposed on the stage (10). The pulse wave emitted by the transmissive ultrasonic transmitter to the battery tab (120) passes through the battery tab (120) and is received by the ultrasonic receiver (30).

4. The non-destructive testing equipment for battery tab solder marks according to claim 1, characterized in that, The ultrasonic transmitter (20) is a reflective ultrasonic transmitter, and the ultrasonic receiver (30) is located above the stage (10). The pulse wave emitted by the reflective ultrasonic transmitter to the battery tab (120) is reflected by the battery tab (120) and received by the ultrasonic receiver (30).

5. The non-destructive testing equipment for battery tab solder marks according to claim 1, characterized in that, There are multiple ultrasonic transmitters (20), which are spaced apart on the same plane. The plane where each ultrasonic transmitter (20) is located is parallel to the plane where the stage (10) is located.

6. The non-destructive testing equipment for battery tab solder marks according to any one of claims 1-5, characterized in that, A first support member (40) is also provided on the outside of the stage (10). A linear drive device (50) is fixed on the first support member (40). The linear drive device (50) is fixedly connected to the ultrasonic transmitter (20). The linear drive device (50) is used to drive the ultrasonic transmitter (20) to move linearly in a direction parallel to the plane of the stage (10).

7. The non-destructive testing equipment for battery tab solder marks according to claim 6, characterized in that, A CCD detector (60) is also provided above the stage (10), and the imaging range of the CCD covers at least the battery tabs (120) on the stage (10).

8. The non-destructive testing equipment for battery tab solder marks according to claim 7, characterized in that, The stage (10) is provided with second support members (80) on both sides along the first direction, and a third support member (90) is fixed between the second support members (80). The CCD detector (60) is provided on the third support member (90), and at least one lighting lamp (70) is also provided on the third support member (90).

9. The non-destructive testing equipment for battery tab solder marks according to claim 8, characterized in that, The bottom of the platform (10) is provided with a slide rail extending along a second direction, and the platform (10) is slidably connected to the slide rail. The second direction is intersecting with the first direction.

10. The non-destructive testing equipment for battery tab solder marks according to claim 7, characterized in that, The non-destructive testing equipment also includes a controller (100), the signal output terminal of the ultrasonic receiver (30) is electrically connected to the signal input terminal of the controller (100), and the signal output terminal of the controller (100) is electrically connected to the signal input terminals of the linear drive device (50) and the CCD detector (60).

11. The non-destructive testing equipment for battery tab solder marks according to claim 10, characterized in that, The non-destructive testing equipment also includes an alarm (110), and the signal output terminal of the controller (100) is electrically connected to the signal input terminal of the alarm (110).

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