Ultrasonic detection equipment for negative pole of automobile power battery

Abstract

The utility model discloses an automobile power battery cathode column ultrasonic detection device, which comprises a rack, a probe frame, a plurality of ultrasonic probes, a tray, a display screen, a controller and a position adjusting mechanism capable of driving the probe frame to translate and lift, the position adjusting mechanism is arranged on the rack, the probe frame is arranged on the power output end of the position adjusting mechanism, and the tray is arranged on the support. The ultrasonic probes are installed on the probe frame at equal intervals in the length direction of the probe frame, the tray is detachably installed at the bottom of the rack and located below the ultrasonic probes, a plurality of containing grooves capable of containing the negative pole columns are formed in the tray, and groove openings of the containing grooves face upwards; the display screen is mounted at the top of the rack; the signal output end of each ultrasonic probe is electrically connected with the corresponding signal input end of the controller, and the position adjusting mechanism and the display screen are electrically connected with the corresponding signal output end of the controller. According to the utility model, a plurality of workpieces to be detected can be scanned at the same time, the detection efficiency is improved, and the quality problem of the negative terminal junction surface is effectively detected.

Description

Technical Field

[0001] This utility model relates to an ultrasonic testing device, and more particularly to an ultrasonic testing device for the negative terminal of an automotive power battery. Background Technology

[0002] As the core power source of electric vehicles, the performance and safety of automotive power battery packs directly determine the vehicle's range, operational stability, and driving safety. The negative terminal on the cover of the power battery structure is a key interface component for realizing battery power output. Due to the stringent requirements of power batteries for conductivity, structural strength, and stability, the negative terminal generally adopts a copper-aluminum composite structure. Copper ensures excellent conductivity, while aluminum balances lightweight and structural adaptability. However, controlling the quality of the bonding surface of this heterogeneous metal composite structure is extremely difficult.

[0003] During the manufacturing process, the copper-aluminum bonding surface is prone to defects such as voids, impurities, hollow areas, and weak adhesion due to process fluctuations (e.g., deviations in welding parameters, incomplete surface treatment). If these defects are not detected in time, they will directly lead to poor battery pack contact or insufficient conductivity: minor defects will cause the battery's internal resistance to increase and energy loss to accelerate, resulting in a significant reduction in the vehicle's driving range; serious defects will cause an abnormal increase in local resistance at the bonding surface, generating a large amount of Joule heat during charging or discharging, and causing the temperature to rise sharply. This may not only damage the battery module but also cause thermal runaway, becoming a major hidden danger that endangers driving safety. Utility Model Content

[0004] The problem to be solved by this utility model is to provide an ultrasonic testing device for the negative terminal of an automotive power battery. This ultrasonic testing device for the negative terminal of an automotive power battery can scan multiple workpieces to be tested at the same time, improve testing efficiency, and effectively detect quality problems of the negative terminal joint surface.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An ultrasonic testing device for the negative terminal of an automotive power battery is characterized by comprising a frame, a probe holder, multiple ultrasonic probes, a tray, a display screen, a controller, and a position adjustment mechanism capable of driving the probe holder to move horizontally and vertically. The position adjustment mechanism is mounted on the frame, the probe holder is mounted on the power output end of the position adjustment mechanism, and each ultrasonic probe is mounted at equal intervals along the length of the probe holder. The tray is detachably mounted at the bottom of the frame and below each ultrasonic probe. The tray has multiple storage slots capable of accommodating the negative terminal, with the slot openings facing upwards. The display screen is mounted on the top of the frame. The signal output terminals of each ultrasonic probe are electrically connected to the corresponding signal input terminals of the controller, and the position adjustment mechanism and the display screen are electrically connected to the corresponding signal output terminals of the controller.

[0007] Typically, each ultrasonic probe is connected to an external ultrasonic flaw detector.

[0008] During testing, multiple negative terminals to be tested are first placed in their respective slots on the tray, ensuring they are neatly arranged with the copper-aluminum interface facing upwards. Then, the tray containing the negative terminals is placed at the bottom of the frame, and the ultrasonic flaw detector is activated. The detector generates high-voltage pulses, exciting the crystals of each ultrasonic probe to vibrate (ultrasonic waves). These waves are then incident perpendicularly on the copper-aluminum interface of the negative terminals for testing. When the ultrasonic waves strike the interface, if defects (such as holes, impurities, voids, weak adhesion, etc.) are encountered, strong reflections occur at the interface due to the difference in acoustic impedance between the defect and the substrate material. The reflected echo is then absorbed by the ultrasonic waves. After receiving the signal, the probe converts it into an electrical signal, which is amplified, sampled, and processed by the ultrasonic flaw detector. By analyzing the amplitude, position, and shape of the echo, the size, location, and nature of the defect can be determined, thus achieving non-destructive testing of the copper-aluminum interface of the negative electrode post. Next, the position adjustment mechanism drives the probe holder and each ultrasonic probe to scan line by line above the negative electrode post. Each ultrasonic probe simultaneously covers multiple negative electrode posts and performs multi-channel ultrasonic scanning. Each step forward transmits and acquires an ultrasonic wave, detecting internal defects in the negative electrode post. The ultrasonic probe sends the detection signal to the controller, which processes it and sends a signal to the display screen. The display screen shows the detection result for each negative electrode post in color. When the ultrasonic probe completes a scan of the entire top-view surface of the negative electrode posts in the tray, a visual C-scan image is formed. By comparing the C-scan images of normal and defective workpieces, the bonding quality of the copper-aluminum interface of the negative electrode post can be determined. Finally, the defective workpiece is removed from the tray, completing the entire scanning process. Generally, the echo amplitude of a poorly bonded copper-aluminum interface will be higher.

[0009] After moving one step and completing the scan, the controller sends a command to the position adjustment mechanism. Upon receiving the signal, the position adjustment mechanism drives the probe holder and each ultrasonic probe to continue moving above the negative electrode post.

[0010] In a preferred embodiment, the position adjustment mechanism includes an X-direction translation mechanism, a Y-direction translation mechanism, and a lifting mechanism. The X-direction translation mechanism is mounted on the frame and positioned above the tray. The Y-direction translation mechanism is mounted on the power output end of the X-direction translation mechanism, the lifting mechanism is mounted on the power output end of the Y-direction translation mechanism, and the probe holder is mounted on the power output end of the lifting mechanism. The position adjustment mechanism begins operation as follows: First, the lifting mechanism drives the probe holder and each ultrasonic probe upwards, creating space for the tray, which is then placed at the corresponding position at the bottom of the frame. Next, the lifting mechanism drives the probe holder and each ultrasonic probe downwards, aligning each ultrasonic probe with the negative electrode post to be tested in the tray. Finally, the X-direction and Y-direction translation mechanisms work together to drive the lifting mechanism, probe holder, and each ultrasonic probe to move horizontally, allowing each ultrasonic probe to simultaneously perform ultrasonic scanning on multiple negative electrodes. This position adjustment mechanism enables precise positioning of each ultrasonic probe, effectively avoiding adverse effects caused by vibration. It can not only flexibly adapt to different process requirements, but also be compatible with various specifications of poles, providing stable and highly adaptable support for related operations.

[0011] In a further preferred embodiment, the X-direction translation mechanism includes a first servo motor, a first sprocket, a first chain, two first slide rails, two first sliders, and a first translation seat. Both first slide rails are mounted on the frame and arranged horizontally. The two first sliders are respectively positioned on their respective first slide rails. The two ends of the first translation seat are respectively mounted on the two first sliders. The Y-direction translation mechanism is mounted on the first translation seat. The first servo motor is mounted on the frame, the first sprocket is mounted on the power output shaft of the first servo motor, one end of the first chain meshes with the first sprocket, and the other end of the first chain is connected to the first translation seat. The first servo motor drives the first translation seat to move horizontally along the two first slide rails.

[0012] In a further preferred embodiment, the Y-direction translation mechanism includes a second servo motor, a second sprocket, a second chain, a second slide rail, a second slider, and a second translation seat. The second slide rail is mounted on the frame and is arranged horizontally. The second slider is located on the second slide rail, and the second translation seat is mounted on the second slider. The lifting mechanism is mounted on the second translation seat. The second servo motor is mounted on the frame, the second sprocket is mounted on the power output shaft of the second servo motor, one end of the second chain meshes with the second sprocket, and the other end of the second chain is connected to the second translation seat. The second servo motor drives the second translation seat to move horizontally on the second slide rail.

[0013] The first and second translation mechanisms mentioned above can also employ a structure that combines a motor and a synchronous belt, or a structure that combines a motor and a screw / nut, to drive the corresponding translation seats to move horizontally.

[0014] In a further preferred embodiment, the lifting mechanism includes a lifting screw, two guide rods, and a lifting seat. The lifting screw is rotatably mounted on the second translation seat and runs vertically. The two guide rods are parallel to the lifting screw. The second translation seat has two guide sleeves through which the guide rods pass. The lifting seat is connected to the lower ends of the two guide rods and also to the lower end of the lifting screw. The probe holder is mounted on the lifting seat. Typically, a handwheel is provided at the upper end of the lifting screw. Rotating the handwheel drives the lifting screw to rotate, thereby causing the lifting seat to move vertically under the guidance of the two guide rods.

[0015] In a further preferred embodiment, the lifting base is equipped with a tilting base, the upper end of which is hinged to the lifting base, and the probe frame is mounted on the lower end of the tilting base. By tilting the tilting base, the probe frame can be adjusted for pitch angle.

[0016] In the preferred embodiment, the ultrasonic probe is a water immersion probe. The water immersion probe is a core device in water immersion flaw detection technology, using ultrasonic waves to detect internal defects in materials. The surface of the water immersion probe employs a waterproof encapsulation process to ensure stability under long-term immersion conditions, making it suitable for testing in harsh environments such as high temperature and high humidity.

[0017] In a preferred embodiment, the top of the frame has an operating surface, and the bottom edge of the display screen is hinged to the edge of the operating surface, allowing the display screen to fold towards the operating surface. When not in use, the display screen can be folded towards the operating surface, transforming it from a vertical position to a flat, stored state, significantly reducing the overall space occupied by the equipment. This is particularly suitable for confined spaces such as workshops and laboratories, avoiding space congestion caused by a protruding display screen and preventing collisions with the display screen when personnel move around or handle materials. Furthermore, operators can flexibly adjust the folding angle of the display screen according to their height and operating posture, ensuring the screen is always at the optimal viewing angle.

[0018] In a preferred embodiment, the bottom of the frame is provided with a positioning groove for positioning the pallet, and the pallet is positioned within the positioning groove. The dimensions of the positioning groove precisely match the edge of the pallet, ensuring accurate fixation of the pallet and preventing pallet displacement.

[0019] In the preferred embodiment, each of the storage slots is arranged at equal intervals on the tray. These equally spaced storage slots have uniform size and spacing, allowing for one-to-one storage of materials, and enabling operators to quickly count the quantity of materials directly from the number of storage slots.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] This invention improves detection efficiency by using multiple ultrasonic probes to scan multiple workpieces simultaneously, effectively detecting quality problems at the negative electrode terminal joint. In actual testing, the number of ultrasonic probes can be increased or decreased according to testing requirements. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of an embodiment of the present invention (with the frame portion hidden).

[0024] Figure 3 yes Figure 2 The left view. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-3 As shown, the ultrasonic testing equipment for the negative terminal of a car power battery in this embodiment includes a frame 1, a probe holder 2, multiple ultrasonic probes 3, a tray 4, a display screen 7, a controller, and a position adjustment mechanism 5 capable of driving the probe holder 2 to move horizontally and vertically. The position adjustment mechanism 5 is mounted on the frame 1, and the probe holder 2 is mounted on the power output end of the position adjustment mechanism 5. Each ultrasonic probe 3 is mounted at equal intervals along the length of the probe holder 2. The tray 4 is detachably mounted at the bottom of the frame 1 and below each ultrasonic probe 3. The tray 4 is provided with multiple storage slots 41 that can accommodate the negative terminal 6, with the slot openings of the storage slots 41 facing upwards. The display screen 7 is mounted on the top of the frame 1. The signal output ends of each ultrasonic probe 3 are electrically connected to the corresponding signal input ends of the controller, and the position adjustment mechanism 5 and the display screen 7 are electrically connected to the corresponding signal output ends of the controller.

[0027] Typically, each ultrasonic probe 3 is connected to an external ultrasonic flaw detector.

[0028] During testing, multiple negative electrode posts 6 to be tested are first placed in the corresponding storage slots 41 of the tray 4, so that the negative electrode posts 6 are neatly arranged in the tray 4 with the copper-aluminum bonding surface of the negative electrode posts 6 facing upwards. Then, the tray 4 containing the negative electrode posts 6 is placed at the bottom of the frame 1, and the ultrasonic flaw detector is started. The ultrasonic flaw detector generates a high-voltage electrical pulse, which excites the crystal of each ultrasonic probe 3 to vibrate (ultrasonic waves). The longitudinal waves are perpendicularly incident on the copper-aluminum bonding surface of the negative electrode post 6 for testing. When the ultrasonic waves are incident on the copper-aluminum bonding surface of the negative electrode post 6, if defects (such as holes, impurities, voids, weak adhesion, etc.) are encountered, due to the difference in acoustic impedance between the defects and the substrate material, the ultrasonic waves will undergo strong reflection at the interface; the reflected echo is absorbed by the ultrasonic waves. After receiving the signal, probe 3 converts it into an electrical signal, which is amplified, sampled, and processed by the ultrasonic flaw detector. By analyzing the amplitude, position, and shape of the echo, the size, location, and nature of the defect can be determined, thus achieving non-destructive testing of the copper-aluminum bonding surface of the negative electrode post 6. Next, the position adjustment mechanism 5 drives the probe holder 2 and each ultrasonic probe 3 to scan line by line above the negative electrode post 6. Each ultrasonic probe 3 simultaneously covers multiple negative electrode posts 6 and performs multi-channel ultrasonic scanning. Each step of movement involves emitting and acquiring an ultrasonic wave to detect internal defects in the negative electrode post 6. The ultrasonic probe 3 sends the detection signal to the controller, which processes it and sends a signal to the display screen 7. The display screen 7 displays the detection result of each negative electrode post 6 in color. When the ultrasonic probe 3 completes the scanning of the entire top view of the negative electrode post 6 in the tray 4, a direct C-scan image is formed. By comparing the differences between the C-scan images of normal and defective workpieces, the bonding quality of the copper-aluminum bonding surface of the negative electrode post 6 can be determined. Finally, the defective workpiece is picked out from the tray 4 and then removed from the tray 4, completing the entire scanning process. Generally speaking, the echo amplitude will be higher at poorly bonded copper-aluminum interfaces.

[0029] After moving one step and completing the scan, the controller sends a command to the position adjustment mechanism 5. Upon receiving the signal, the position adjustment mechanism 5 drives the probe holder 2 and each ultrasonic probe 3 to continue moving above the negative electrode post 6.

[0030] The position adjustment mechanism 5 includes an X-direction translation mechanism 51, a Y-direction translation mechanism 52, and a lifting mechanism 53. The X-direction translation mechanism 51 is mounted on the frame 1 and is positioned above the tray 4. The Y-direction translation mechanism 52 is mounted on the power output end of the X-direction translation mechanism 51, and the lifting mechanism 53 is mounted on the power output end of the Y-direction translation mechanism 52. The probe holder 2 is mounted on the power output end of the lifting mechanism 53. The position adjustment mechanism 5 begins operation as follows: First, the lifting mechanism 53 drives the probe holder 2 and each ultrasonic probe 3 upwards, creating space for the tray 4, which is then placed at the corresponding position at the bottom of the frame 1. Then, the lifting mechanism 53 drives the probe holder 2 and each ultrasonic probe 3 downwards, aligning each ultrasonic probe 3 with the negative electrode post 6 to be tested in the tray 4. Finally, the X-direction translation mechanism 51 and the Y-direction translation mechanism 52 work together to drive the lifting mechanism 53, the probe holder 2, and each ultrasonic probe 3 to move horizontally, allowing each ultrasonic probe 3 to simultaneously perform ultrasonic scanning on multiple negative electrode posts 6. This position adjustment mechanism 5 enables precise positioning of each ultrasonic probe 3, effectively avoiding adverse effects caused by vibration. It can not only flexibly adapt to different process requirements, but also be compatible with various specifications of poles, providing stable and highly adaptable support for related operations.

[0031] The X-direction translation mechanism 51 includes a first servo motor 511, a first sprocket (not shown in the figure), a first chain 512, two first slide rails 513, two first sliders 514, and a first translation seat 515. Both first slide rails 513 are mounted on the frame 1 and are arranged horizontally. The two first sliders 514 are respectively located on their respective first slide rails 513. Both ends of the first translation seat 515 are respectively mounted on the two first sliders 514. The Y-direction translation mechanism 52 is mounted on the first translation seat 515. The first servo motor 511 is mounted on the frame 1, the first sprocket is mounted on the power output shaft of the first servo motor 511, one end of the first chain 512 meshes with the first sprocket, and the other end of the first chain 512 is connected to the first translation seat 515. The first servo motor 511 drives the first translation seat 515 to move horizontally along the two first slide rails 513.

[0032] The Y-direction translation mechanism 52 includes a second servo motor 521, a second sprocket (not shown in the figure), a second chain 522, a second slide rail 523, a second slider 524, and a second translation seat 525. The second slide rail 523 is mounted on the frame 1 and is arranged horizontally. The second slider 524 is located on the second slide rail 523, and the second translation seat 525 is mounted on the second slider 524. The lifting mechanism 53 is mounted on the second translation seat 525. The second servo motor 521 is mounted on the frame 1, the second sprocket is mounted on the power output shaft of the second servo motor 521, one end of the second chain 522 meshes with the second sprocket, and the other end of the second chain 522 is connected to the second translation seat 525. The second servo motor 521 drives the second translation seat 525 to move horizontally on the second slide rail 523.

[0033] The lifting mechanism 53 includes a lifting screw 531, two guide rods 532, and a lifting seat 533. The lifting screw 531 is rotatably mounted on the second translation seat 525 and runs vertically. The two guide rods 532 are parallel to the lifting screw 531. The second translation seat 525 is provided with two guide sleeves 534, through which the guide rods 532 pass. The lifting seat 533 is connected to the lower ends of the two guide rods 532 and also to the lower end of the lifting screw 531. The probe holder 2 is mounted on the lifting seat 533. Typically, a handwheel is provided at the upper end of the lifting screw 531. Rotating the handwheel drives the lifting screw 531 to rotate, thereby causing the lifting seat 533 to move vertically under the guidance of the two guide rods 532.

[0034] The lifting base 533 is equipped with a flip base 535, the upper end of which is hinged to the lifting base 533. The probe frame 2 is mounted on the lower end of the flip base 535. By flipping the flip base 535, the probe frame 2 can achieve the function of adjusting the pitch angle.

[0035] Ultrasonic probe 3 is a water immersion probe. The water immersion probe is a core device in water immersion flaw detection technology, using ultrasonic waves to detect internal defects in materials. The surface of the water immersion probe employs a waterproof encapsulation process to ensure stability under long-term immersion conditions, making it suitable for harsh environments such as high temperature and high humidity testing scenarios.

[0036] The top of the frame 1 is provided with an operating surface 11. The bottom edge of the display screen 7 is hinged to the edge of the operating surface 11, allowing the display screen 7 to fold towards the operating surface 11. When not in use, the display screen 7 can be folded towards the operating surface 11, changing its vertical position to a flat, stored state, significantly reducing the overall space occupied by the equipment. This is especially suitable for compact spaces such as workshops and laboratories, avoiding space congestion caused by the protruding display screen 7 and preventing collisions with the display screen 7 when personnel move around or handle materials. Furthermore, operators can flexibly adjust the folding angle of the display screen 7 according to their height and operating posture, ensuring the screen is always at the optimal viewing angle.

[0037] The bottom of the frame 1 is provided with a positioning groove 12 for positioning the tray 4, and the tray 4 is located in the positioning groove 12. The size of the positioning groove 12 is precisely matched with the edge of the tray 4, which accurately fixes the tray 4 and prevents the tray 4 from shifting.

[0038] Each of the aforementioned storage slots 41 is equally spaced on the tray 4. The equally spaced storage slots 41 have a uniform size and spacing, which allows for one-to-one storage of materials, and operators can quickly count the quantity of materials by directly counting the number of storage slots 41.

[0039] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, they should all fall within the protection scope of this utility model.

Claims

1. An automobile power battery negative pole post ultrasonic detection device, characterized in that: The position adjusting mechanism is installed on the rack, the probe holder is installed on the power output end of the position adjusting mechanism, each ultrasonic probe is installed on the probe holder along the length direction of the probe holder at equal intervals, the tray is detachably installed on the bottom of the rack and below each ultrasonic probe, the tray is provided with a plurality of storage grooves capable of accommodating the negative pole, and the groove opening of the storage groove faces upward. The display screen is installed on the top of the rack, the signal output ends of each ultrasonic probe are electrically connected with the corresponding signal input ends of the controller, and the position adjusting mechanism and the display screen are electrically connected with the corresponding signal output ends of the controller.

2. The automobile power battery negative pole post ultrasonic detection device according to claim 1, characterized in that: The position adjusting mechanism comprises an X-direction translation mechanism, a Y-direction translation mechanism and a lifting mechanism, the X-direction translation mechanism is installed on the rack and above the tray, the Y-direction translation mechanism is installed on the power output end of the X-direction translation mechanism, and the lifting mechanism is installed on the power output end of the Y-direction translation mechanism.

3. The automobile power battery negative pole post ultrasonic detection device according to claim 2, characterized in that: The X-direction translation mechanism comprises a first servo motor, a first chain wheel, a first chain, two first sliding rails, two first sliding blocks and a first translation seat, the two first sliding rails are installed on the rack and arranged in the horizontal direction, the two first sliding blocks are respectively on the corresponding first sliding rails, the two ends of the first translation seat are respectively installed on the two first sliding blocks, and the Y-direction translation mechanism is installed on the first translation seat.

4. The automobile power battery negative pole post ultrasonic detection device according to claim 3, characterized in that: The Y-direction translation mechanism comprises a second servo motor, a second chain wheel, a second chain, a second sliding rail, a second sliding block and a second translation seat, the second sliding rail is installed on the rack and arranged in the horizontal direction, the second sliding block is on the second sliding rail, the second translation seat is installed on the second sliding block, and the lifting mechanism is installed on the second translation seat.

5. The automobile power battery negative pole post ultrasonic detection device according to claim 4, characterized in that: The lifting mechanism comprises a lifting screw, two guide rods and a lifting seat, the lifting screw is rotatably installed on the second translation seat and extends upward and downward, the two guide rods are parallel to the lifting screw, the second translation seat is provided with two guide sleeves, the guide rods pass through the corresponding guide sleeves, the lifting seat is connected with the lower ends of the two guide rods and connected with the lower end of the lifting screw, and the probe holder is installed on the lifting seat.

6. The automobile power battery negative pole post ultrasonic detection device according to claim 5, characterized in that: The lifting seat is provided with a turnover seat, the upper end of the turnover seat is hinged to the lifting seat, and the probe holder is installed on the lower end of the turnover seat.

7. The automobile power battery negative pole post ultrasonic detection device according to claim 1, characterized in that: The ultrasonic probe is a water immersion probe.

8. The automobile power battery negative pole post ultrasonic detection device according to claim 1, characterized in that: The top of the rack is provided with an operation plane, the bottom edge of the display screen is hinged to the edge of the operation plane, and the display screen can be folded toward the operation plane.

9. The automobile power battery negative pole post ultrasonic detection device according to claim 1, characterized in that: The bottom of the rack is provided with a positioning groove capable of positioning the tray, and the tray is in the positioning groove.

10. The apparatus for ultrasonic testing of negative pole post of automobile power battery according to claim 1, characterized in that: The plurality of storage grooves are arranged at equal intervals on the tray.

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