A device for realizing nondestructive testing of lithium ion battery by using ultrasonic phased array technology

Abstract

The application discloses a device for realizing nondestructive detection of lithium ion batteries by using ultrasonic phased array technology, and relates to the field of battery detection.The device comprises a fixing base, a hydraulic cylinder arranged on the top of the fixing base, an ultrasonic phased array mechanism connected to the output end of the hydraulic cylinder, a group of placing seats movably arranged on one side of the fixing base, and a group of mounting racks fixedly arranged on one side of the fixing base.The application drives the infusion control mechanism to provide coupling liquid for the battery to be detected by placing the battery to be detected on the placing seat and moving the placing seat into the fixing base for detection, and makes the rotating frame overturn from providing the coupling liquid to the cleaning mechanism when the placing seat is pulled out of the fixing base, so that the coupling liquid on the surface of the battery after detection is cleaned, and the process of ultrasonic phased array detection of the battery is effectively simplified.Coupling liquid is applied when the battery enters the detection position, and cleaning is performed when the battery leaves the detection position.

Description

Technical Field

[0001] The present invention relates to the field of battery testing, and in particular to a device for realizing nondestructive testing of lithium-ion batteries using ultrasonic phased array technology. Background Art

[0002] The development of energy storage technology plays a significant role in applications ranging from terminal consumer products such as electric vehicles, drones, smartphones, and smart watches to large applications such as communication base stations, distributed microgrids, and renewable energy power generation systems. The smallest energy storage unit of energy storage technology is the battery. Among the currently common energy storage batteries, lithium batteries have the advantages of high energy density, long life, and stable operation, making them the mainstream choice of energy storage batteries.

[0003] As a state quantity that characterizes the remaining capacity of a battery, its accurate estimation is one of the core technologies in battery management systems and the basis for controlling the energy balance of battery energy storage systems. Its accurate estimation can not only effectively prevent overcharging and over-discharging, but is also the main basis for the rational use and effective maintenance of batteries. However, the battery's state of charge is not a physical quantity that can be directly measured by instruments and can only be estimated indirectly by measuring other physical quantities.

[0004] Ultrasonic phased array testing has the advantages of being non-destructive, fast-response, with a wide detection range and low cost, as well as having high detection sensitivity and resolution. Ultrasonic phased array testing technology is used to estimate the SOC of lithium-ion power batteries, enabling contactless internal bubble detection of lithium-ion soft-pack batteries. It can also accurately detect the distribution of bubbles and bubble defects of varying depths that cannot be distinguished externally. The ultrasonic signal detected by the ultrasonic phased array is used to extract the peak value and energy integral characteristics of the signal.

[0005] Therefore, when using ultrasonic phased array technology to detect the state of charge of a battery, the battery is generally charged and discharged, and then the battery is tested by an ultrasonic probe. However, because the ultrasonic signal of the ultrasonic probe is easily interfered by air, a coupling fluid needs to be applied to the battery surface to minimize the impact of gaps on the ultrasonic signal. In this case, a step of applying coupling fluid before the battery test is required, and the coupling fluid needs to be cleaned after the battery test is completed. This is time-consuming and labor-intensive, and affects the battery test rate. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a device for non-destructive testing of lithium-ion batteries using ultrasonic phased array technology to solve the technical problem that a step of applying coupling fluid before battery testing is required and cleaning the coupling fluid after the battery testing is completed is time-consuming and labor-intensive, which affects the battery testing rate.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for realizing non-destructive testing of lithium-ion batteries using ultrasonic phased array technology, comprising a fixed seat and a hydraulic cylinder installed on the top of the fixed seat, the output end of the hydraulic cylinder being connected to an ultrasonic phased array mechanism, a group of placement seats being movably provided on one side of the fixed seat, a group of mounting frames being fixedly provided on one side of the fixed seat, a driving motor being installed inside the mounting frame, the output end of the driving motor being connected to a gear shaft, a positioning rack being provided at the bottom of each placement seat, and the gear of the gear shaft being meshed with the positioning rack, a rotation control mechanism being installed on the outer wall of one of the mounting frames, and an infusion control mechanism being installed on the outer wall of the other mounting frame, the rotation control mechanism being connected to the rotating frame inside the mounting frame, the infusion control mechanism being connected to the liquid storage tank outside the mounting frame, a cleaning mechanism being installed on the top of the rotating frame, and a liquid outlet plate being installed on the bottom of the rotating frame.

[0008] The present invention is further configured such that a rotating shaft is rotatably provided on one side of the mounting frame close to the placement seat, wherein an outer wall of one of the rotating shafts is provided with a rotating gear, and an outer wall of the other rotating shaft is provided with a first gear and a second gear.

[0009] The present invention is further configured as follows: the infusion control mechanism includes a first rack, a peristaltic pump body, a liquid outlet tube and a connecting tube; the first rack is installed at the bottom of the placement seat and meshes with the rotating gear, and one end of the rotating shaft provided with the rotating gear passes through the mounting frame and is connected to the peristaltic pump body; the liquid inlet end of the peristaltic pump body is connected to the liquid storage tank; the liquid outlet end of the peristaltic pump body is connected to the liquid outlet tube, and one end of the liquid outlet tube is connected to the connecting tube.

[0010] The present invention is further configured such that the rotation control mechanism includes a second rack, a third rack, and a chain transmission mechanism; the second rack and the third rack are arranged at the bottom of the placement seat of the liquid storage tank, and the second rack and the third rack are respectively meshed with the second gear and the first gear; one end of the rotating shaft provided with the first gear and the second gear passes through the mounting frame and is connected to the chain transmission mechanism on one side of the mounting frame; and the chain transmission mechanism is connected to the rotating frame.

[0011] The present invention is further configured such that a one-way ratchet mechanism is provided between the first gear, the second gear and the rotating shaft, and the one-way ratchet mechanisms of the first gear and the second gear are in opposite directions.

[0012] The present invention is further configured such that the rotating shaft provided with the rotating gear is a two-section structure, and the two sections of the rotating shaft are connected via a ratchet pawl.

[0013] The present invention is further configured such that a liquid storage tank is installed inside the liquid outlet plate, a plurality of liquid outlet holes are opened on the outer wall of the liquid outlet plate, and the liquid outlet holes are connected to the liquid storage tank, and a liquid infusion tube is provided on one side of the liquid outlet plate.

[0014] The present invention is further configured as follows: the cleaning mechanism includes a positioning shell, a rotating roller, a scraper, a liquid outlet, a positioning tube and a liquid collecting tank; the positioning shell is fixedly arranged on the top of the rotating frame; a rotating roller is rotatably arranged inside the positioning shell; a plurality of scrapers are fixedly arranged on the outer wall of the rotating roller; one side of the positioning shell is connected to the liquid outlet; one side of the mounting frame is provided with a liquid collecting tank; and the liquid inlet end of the liquid collecting tank is connected to the positioning tube.

[0015] The present invention is further configured such that a positioning plate is provided at one end of the placement seat.

[0016] The present invention is further configured such that a positioning ball is provided on the inner side of the mounting frame via a spring, and a positioning groove is provided on the outer wall of the rotating frame, the shape and size of which match those of the positioning ball.

[0017] In summary, the present invention mainly has the following beneficial effects: the present invention places the battery to be tested on the placement seat, and the placement seat pushes the fixed seat to perform testing, thereby driving the infusion control mechanism to provide coupling liquid for the battery to be tested, and when the placement seat is pulled out of the fixed seat, the rotating frame is flipped, and the mechanism changes from providing coupling liquid to cleaning, so as to clean the coupling liquid on the surface of the battery after testing, thereby effectively simplifying the process of ultrasonic phased control testing of the battery, and performing coupling liquid smearing when the battery enters the testing position, and performing cleaning when the battery leaves the testing position. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the bottom structure of the placement seat of the present invention;

[0020] Figure 3 This is a schematic structural diagram of the rotating frame of the present invention from a first perspective;

[0021] Figure 4 This is a schematic structural diagram of the rotating frame of the present invention from a second viewing angle;

[0022] Figure 5 3. It is a schematic structural diagram of the rotating frame of the present invention from a third viewing angle;

[0023] Figure 6 is a cross-sectional view of the mounting bracket of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the positioning shell of the present invention;

[0025] Figure 8 This is a schematic diagram of the cleaning state of the cleaning mechanism of the present invention;

[0026] Figure 9 This is a schematic diagram of the inner side of the mounting bracket of the present invention;

[0027] Figure 10 This is a schematic structural diagram of the two-section rotating shaft of the present invention;

[0028] Figure 11 For the present invention Figure 2 Schematic diagram of the structure at A;

[0029] Figure 12 For the present invention Figure 3 Schematic diagram of the structure at point B.

[0030] In the figure: 1. Fixed seat; 2. Hydraulic cylinder; 3. Ultrasonic phased array mechanism; 4. Mounting frame; 5. Placement seat; 6. Positioning plate; 7. Positioning rack; 8. Gear shaft; 9. First rack; 10. Second rack; 11. Rotating shaft; 12. First gear; 13. Second gear; 14. Third rack; 15. Peristaltic pump body; 16. Liquid outlet pipe; 17. Connecting pipe; 18. Infusion pipe; 19. Rotating frame; 20. Positioning shell; 21. Rotating roller; 22. Scraper; 23. Liquid outlet; 24. Positioning pipe; 25. Liquid storage tank; 26. Liquid outlet plate; 27. Chain transmission mechanism; 28. Liquid collecting tank; 29. ​​Positioning ball. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0032] The following describes an embodiment of the present invention based on its overall structure.

[0033] A device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology, such as Figure 1-12 As shown, it includes a fixing base 1 and a hydraulic cylinder 2 installed on the top of the fixing base 1. The output end of the hydraulic cylinder 2 is connected to the ultrasonic phased array mechanism 3. When the battery to be tested enters the testing position, that is, under the ultrasonic phased array mechanism 3 for charging and discharging, the hydraulic cylinder 2 drives the ultrasonic phased array mechanism 3 to perform corresponding testing work.

[0034] A group of placement seats 5 are movably provided on one side of the fixed base 1, and a group of mounting frames 4 are fixedly provided on one side of the fixed base 1. A driving motor is installed inside the mounting frame 4, and the output end of the driving motor is connected to the gear shaft 8. The bottom of the placement seat 5 is provided with a positioning rack 7, and the gear of the gear shaft 8 is engaged with the positioning rack 7. After the battery to be tested is placed on the top of the placement seat 5, the driving motor is started to drive the gear shaft 8 to rotate. At this time, the placement seat 5 moves toward the inside of the fixed base 1 under the meshing action of the gear shaft 8 and the positioning rack 7.

[0035] The mounting frame 4 is provided with a rotating shaft 11 on one side close to the placement seat 5, and a rotating gear is provided on the outer wall of one rotating shaft 11, and a first gear 12 and a second gear 13 are provided on the outer wall of the other rotating shaft 11. The outer wall of the mounting frame 4 is provided with an infusion control mechanism, and the infusion control mechanism includes a first rack 9, which is installed at the bottom of the placement seat 5 and meshes with the rotating gear. One end of the rotating shaft 11 provided with the rotating gear passes through the mounting frame 4 and is connected to the peristaltic pump body 15. The liquid inlet end of the peristaltic pump body 15 is connected to the liquid storage tank 25, and the liquid outlet end of the peristaltic pump body 15 is connected to the liquid outlet pipe 16, and one end of the liquid outlet pipe 16 is connected to the connecting pipe 1 7 is connected, the liquid outlet pipe 16 and the connecting pipe 17 are rotationally sealed, and the connecting pipe 17 can also serve as the rotating shaft of the rotating frame 19. When the placement seat 5 moves toward the inside of the fixed seat 1, the rotating gear and the first rack 9 are in contact and engaged, and the rotating shaft 11 rotates. At this time, the rotating rotating shaft 11 drives the peristaltic pump body 15 to operate, and the coupling liquid filled with the inside of the liquid storage tank 25 is drawn into the liquid outlet pipe 16, and then into the connecting pipe 17. The connecting pipe 17 is connected to the liquid outlet plate 26, and the coupling liquid is applied from the liquid outlet plate 26 to the surface of the battery. The smearing action is carried out at the same time that the battery on the top of the placement seat 5 enters the detection position, which effectively simplifies the coupling liquid smearing process.

[0036] A liquid storage tank is installed inside the liquid outlet plate 26, and a plurality of liquid outlet holes are opened on the outer wall of the liquid outlet plate 26, and the liquid outlet holes are connected to the liquid storage tank. A liquid infusion tube 18 is provided on one side of the liquid outlet plate 26. After the coupling liquid enters the liquid outlet plate 26, it is temporarily stored in the liquid storage tank and discharged through the liquid outlet hole to be applied to the battery surface.

[0037] Furthermore, the action of the placement seat 5 entering the interior of the fixed seat 1 will provide power for the rotation of the rotating shaft 11, but when the placement seat 5 leaves the detection position inside the fixed seat 1, the rotating shaft 11 will rotate in the opposite direction to draw back the coupling liquid that originally entered the liquid outlet plate 26. In order to prevent the coupling liquid from flowing back, the rotating shaft 11 with a rotating gear is a two-section structure, and the two sections of the rotating shaft 11 are connected by a ratchet pawl. When the placement seat 5 leaves the detection position inside the fixed seat 1, under the action of the ratchet pawl, the rotating shaft 11 does not move synchronously, that is, it will not drive the peristaltic pump body 15 to reversely extract the coupling liquid.

[0038] A rotation control mechanism is installed on the outer wall of another mounting frame 4. The rotation control mechanism includes a second rack 10. The second rack 10 and the third rack 14 are arranged at the bottom of the placement seat 5 of the liquid storage tank 25, and the second rack 10 and the third rack 14 are respectively engaged with the second gear 13 and the first gear 12. One end of the rotating shaft 11 provided with the first gear 12 and the second gear 13 passes through the mounting frame 4 and is connected to the chain transmission mechanism 27 on one side of the mounting frame 4. The chain transmission mechanism 27 is connected to the rotating frame 19. When the placement seat 5 moves toward the inside of the fixed seat 1, the coupling liquid is applied to the surface of the battery from the liquid outlet plate 26. Until the placement seat 5 completely enters the internal detection position of the fixing seat 1 to perform charging and discharging operations, and the ultrasonic phased array mechanism 3 detects the battery, at this time, the second gear 13 and the second rack 10 have completed the meshing work, and the rotation shaft 11 is provided with rotational power by the movement of the placement seat 5, driving the chain transmission mechanism 27 to rotate, and then driving the rotating frame 19 to rotate, turning the liquid outlet plate 26 originally located below the rotating frame 19 to the top, and turning the cleaning mechanism installed on the top of the rotating frame 19 to the bottom. After the placement seat 5 exits the detection position, the cleaning mechanism cleans the coupling liquid applied to the surface of the battery;

[0039] When the placement seat 5 enters the fixed seat 1 , the position of the rotating frame 19 is staggered with the placement seat 5 , so the rotating frame 19 can rotate smoothly.

[0040] The cleaning mechanism includes a positioning shell 20, which is fixedly mounted on the top of the rotating frame 19. A rotating roller 21 is rotatably mounted inside the positioning shell 20, and a plurality of scrapers 22 are fixedly mounted on the outer wall of the rotating roller 21. A liquid outlet 23 is connected to one side of the positioning shell 20, and a liquid collecting tank 28 is provided on one side of the mounting frame 4. The liquid inlet end of the liquid collecting tank 28 is connected to a positioning tube 24. When the coupling liquid on the battery surface needs to be cleaned, the motor controls the rotation of the rotating roller 21, and the scrapers 22 on the surface of the rotating roller 21 scrape the coupling liquid into the interior of the positioning shell 20. Since the coupling liquid is in a gel state, it can be temporarily stored in the positioning shell 20.

[0041] Subsequently, when the placement seat 5 is completely withdrawn from the fixing seat 1, the first gear 12 is in contact and meshed with the first rack 9, and the rotating shaft 11 rotates in the opposite direction. At this time, the chain transmission mechanism 27 rotates in the opposite direction and drives the rotating frame 19 to rotate back to its original position.

[0042] A positioning ball 29 is provided on the inner side of the mounting frame 4 through a spring, and a positioning groove whose shape and size match those of the positioning ball 29 is opened on the outer wall of the rotating frame 19. The positioning ball 29 is used to position the rotation of the rotating frame 19. When the rotating frame 19 is rotated to the corresponding position, the positioning ball 29 is inserted into the positioning groove to position the rotating frame 19 and make it more stable.

[0043] At this time, the gel in the positioning shell 20 flows downward along the liquid outlet 23 until it enters the positioning tube 24 and is collected by the liquid collecting tank 28. When the cleaning mechanism cleans the battery surface, the liquid outlet 23 is in an upward state and the coupling liquid does not flow out. When the cleaning mechanism completes the cleaning and the rotating frame 19 returns to its original position, the liquid outlet direction of the liquid outlet 23 is downward and aligned with the positioning tube 24. Only then can the coupling liquid flow out of the positioning shell 20.

[0044] Furthermore, electromagnetic valves are provided at the contact positions of the liquid outlet 23 and the positioning tube 24 , which are opened only when the liquid outlet 23 and the positioning tube 24 are in contact, thereby effectively preventing the coupling liquid from flowing out and polluting the environment.

[0045] A one-way ratchet mechanism is provided between the first gear 12 , the second gear 13 and the rotating shaft 11 , and the one-way ratchet mechanisms of the first gear 12 and the second gear 13 are in opposite directions. The one-way ratchet mechanism of the first gear 12 and the second gear 13 can effectively reduce the number of rotations of the rotating frame 19 .

[0046] A positioning plate 6 is provided at one end of the placement seat 5 for positioning the battery on the top of the placement seat 5. First, the battery is placed close to the positioning plate 6, and then the battery is moved horizontally until it is close to the liquid storage tank 25. At this time, the battery positioning is completed.

Claims

1. A device for realizing nondestructive testing of lithium-ion batteries using ultrasonic phased array technology, comprising a fixed base (1) and a hydraulic cylinder (2) mounted on the top of the fixed base (1), wherein the output end of the hydraulic cylinder (2) is connected to an ultrasonic phased array mechanism (3), and is characterized in that: A group of placement seats (5) is movably provided on one side of the fixed seat (1), and a group of mounting frames (4) is fixedly provided on one side of the fixed seat (1). A driving motor is installed inside the mounting frame (4), and the output end of the driving motor is connected to a gear shaft (8). A positioning rack (7) is provided at the bottom of each of the placement seats (5), and the gear of the gear shaft (8) and the positioning rack (7) are meshed with each other. A rotation control mechanism is installed on the outer wall of one of the mounting frames (4), and an infusion control mechanism is installed on the outer wall of the other mounting frame (4). The rotation control mechanism is connected to a rotating frame (19) on the inner side of the mounting frame (4), and the infusion control mechanism is connected to a liquid storage tank (25) on the outer side of the mounting frame (4). A cleaning mechanism is installed on the top of the rotating frame (19), and a liquid outlet plate (26) is installed on the bottom of the rotating frame (19).

2. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 1, characterized in that: A rotating shaft (11) is rotatably provided on one side of the mounting frame (4) close to the placement seat (5), wherein an outer wall of one of the rotating shafts (11) is provided with a rotating gear, and an outer wall of the other rotating shaft (11) is provided with a first gear (12) and a second gear (13).

3. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 2, characterized in that: The infusion control mechanism comprises a first rack (9), a peristaltic pump body (15), a liquid outlet pipe (16) and a connecting pipe (17); the first rack (9) is mounted on the bottom of the placement seat (5) and meshes with the rotating gear, and one end of the rotating shaft (11) provided with the rotating gear passes through the mounting frame (4) and is connected to the peristaltic pump body (15); the liquid inlet end of the peristaltic pump body (15) is connected to the liquid storage tank (25); the liquid outlet end of the peristaltic pump body (15) is connected to the liquid outlet pipe (16), and one end of the liquid outlet pipe (16) is connected to the connecting pipe (17).

4. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 2, characterized in that: The rotation control mechanism includes a second rack (10), a third rack (14), and a chain transmission mechanism (27). The second rack (10) and the third rack (14) are arranged at the bottom of the placement seat (5) of the liquid storage tank (25), and the second rack (10) and the third rack (14) are respectively engaged with the second gear (13) and the first gear (12). One end of the rotating shaft (11) provided with the first gear (12) and the second gear (13) passes through the mounting frame (4) and is connected to the chain transmission mechanism (27) on one side of the mounting frame (4). The chain transmission mechanism (27) is connected to the rotating frame (19).

5. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 4, characterized in that: A one-way ratchet mechanism is provided between the first gear (12), the second gear (13) and the rotating shaft (11), and the one-way ratchet mechanisms of the first gear (12) and the second gear (13) are in opposite directions.

6. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 2, characterized in that: The rotating shaft (11) provided with the rotating gear is a two-section structure, and the two sections of the rotating shaft (11) are connected via a ratchet pawl.

7. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 1, characterized in that: A liquid storage tank is installed inside the liquid outlet plate (26), a plurality of liquid outlet holes are opened on the outer wall of the liquid outlet plate (26), and the liquid outlet holes are connected to the liquid storage tank, and a liquid infusion tube (18) is provided on one side of the liquid outlet plate (26).

8. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 1, characterized in that: The cleaning mechanism comprises a positioning shell (20), a rotating roller (21), a scraper (22), a liquid outlet (23), a positioning tube (24) and a liquid collecting tank (28); the positioning shell (20) is fixedly arranged on the top of the rotating frame (19); a rotating roller (21) is rotatably arranged inside the positioning shell (20); a plurality of scrapers (22) are fixedly arranged on the outer wall of the rotating roller (21); one side of the positioning shell (20) is connected to the liquid outlet (23); one side of the mounting frame (4) is provided with a liquid collecting tank (28); and the liquid inlet end of the liquid collecting tank (28) is connected to the positioning tube (24).

9. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 1, characterized in that: A positioning plate (6) is provided at one end of the placement seat (5).

10. The device for nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 1, characterized in that: A positioning ball (29) is provided on the inner side of the mounting frame (4) via a spring, and a positioning groove having a shape and size matching that of the positioning ball (29) is provided on the outer wall of the rotating frame (19).

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