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

Abstract

The invention discloses a device for realizing nondestructive testing of a lithium ion battery by utilizing an ultrasonic phased array technology, and relates to the field of battery detection, the device comprises a fixed seat and a hydraulic cylinder mounted at the top of the fixed seat, the output end of the hydraulic cylinder is connected with an ultrasonic phased array mechanism, and one side of the fixed seat is movably provided with a group of placing seats; and a group of mounting frames are fixedly arranged on one side of the fixed seat. A to-be-detected battery is placed on the placing seat, the placing seat is pushed into the fixing seat for detection, the infusion control mechanism is driven to provide coupling liquid for the to-be-detected battery, when the placing seat is pulled out of the fixing seat, the rotating frame is turned over, and the coupling liquid is provided by the cleaning mechanism. The coupling liquid on the surface of the detected battery is cleaned, the process of ultrasonic phase control detection of the battery is effectively simplified, the coupling liquid is smeared when the battery enters a detection position, and the battery is cleaned when leaving the detection position.

Description

Technical Field

[0001] The present invention relates to the field of battery detection, and in particular to a device for realizing nondestructive detection of lithium-ion batteries by utilizing 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, smart phones, smart watches to 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 current common energy storage batteries, lithium batteries have the advantages of high energy density, long life, and stable operation, and have therefore become the mainstream choice for energy storage batteries.

[0003] The state of charge is a state quantity that characterizes the remaining capacity of the battery. Its accurate estimation is one of the most core technologies in the battery management system and is also the basis for controlling the energy balance of the battery energy storage system. Its accurate estimation can not only effectively prevent overcharging and over-discharging, but also is the main basis for the rational use and effective maintenance of the battery. However, the battery 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] Since ultrasonic phased array detection has the advantages of being non-destructive, fast response, wide detection range and low cost, and has high detection sensitivity and resolution, the ultrasonic phased array detection technology is used to estimate the SOC of lithium-ion power batteries, realizing non-contact 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 from the outside. The ultrasonic signal detected by the ultrasonic phased array can be used to extract the peak value and energy integration 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 the battery is detected by an ultrasonic probe. However, since the ultrasonic signal of the ultrasonic probe is easily interfered by air, it is necessary to apply coupling fluid on the surface of the battery to minimize the impact of gaps on the ultrasonic signal. At this time, a step of applying coupling fluid needs to be added before battery detection, and the coupling fluid needs to be cleaned after the battery detection is completed, which is time-consuming and labor-intensive, and affects the rate of battery detection. 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, so as to solve the technical problem that a step of applying coupling fluid is required before battery testing, and the coupling fluid needs to be cleaned after the battery testing is completed, which is time-consuming and labor-intensive and affects the rate of battery testing.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for realizing nondestructive 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 is connected to an ultrasonic phased array mechanism, a group of placement seats are movably arranged on one side of the fixed seat, a group of mounting frames are fixedly arranged on one side of the fixed seat, a driving motor is installed inside the mounting frame, a gear shaft is connected to the output end of the driving motor, a positioning rack is arranged at the bottom of each placement seat, and the gear of the gear shaft is meshed with the positioning rack, a rotation control mechanism is installed on the outer wall of one of the mounting frames, and an infusion control mechanism is installed on the outer wall of the other mounting frame, the rotation control mechanism is connected to the rotating frame inside the mounting frame, the infusion control mechanism is connected to the liquid storage tank outside the mounting frame, a cleaning mechanism is installed on the top of the rotating frame, and a liquid outlet plate is installed at 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 first gear and the second gear, one end of the rotating shaft of the first gear and the second gear is provided to pass 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 disposed 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 arranged 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 arranged on the inner side of the mounting frame via a spring, and a positioning groove matching the positioning ball in shape and size is opened on the outer wall of the rotating frame.

[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 is pushed into the fixed seat for 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 coupling liquid is switched to a cleaning mechanism to clean the coupling liquid on the surface of the battery after the test, thereby effectively simplifying the process of ultrasonic phase control testing of the battery, applying the coupling liquid when the battery enters the testing position, and cleaning the battery when it 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; Figure 2 This is a schematic diagram of the bottom structure of the placement seat of the present invention; Figure 3 This is a schematic structural diagram of a rotating frame of the present invention from a first viewing angle; Figure 4 It is a schematic structural diagram of the rotating frame of the present invention from a second viewing angle; Figure 5 It is a schematic structural diagram of the rotating frame of the present invention from a third viewing angle; Figure 6 is a cross-sectional view of the mounting frame of the present invention; Figure 7 This is a schematic diagram of the internal structure of the positioning shell of the present invention; Figure 8 This is a schematic diagram of the cleaning state of the cleaning mechanism of the present invention; Fig. 9 It is a schematic diagram of the inner side of the mounting frame of the present invention; Fig.10 It is a schematic diagram of the structure of the two-section rotating shaft of the present invention; Fig.11 For the present invention Figure 2A schematic diagram of the structure at A; Fig.12 For the present invention Figure 3 Schematic diagram of the structure at point B.

[0019] 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 tube; 25. liquid storage tank; 26. liquid outlet plate; 27. chain transmission mechanism; 28. liquid collecting tank; 29. ​​positioning ball. DETAILED DESCRIPTION

[0020] 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 cannot be understood as limiting the present invention.

[0021] The following describes an embodiment of the present invention based on its overall structure.

[0022] 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 an ultrasonic phased array mechanism 3. When the battery to be tested enters the testing position, that is, the bottom of the ultrasonic phased array mechanism 3 for charging and discharging, the hydraulic cylinder 2 drives the bottom of the ultrasonic phased array mechanism 3 to perform corresponding testing work.

[0023] A group of placement seats 5 are movably provided on one side of the fixed seat 1, and a group of mounting frames 4 are 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 the placement seat 5, and the gear of the gear shaft 8 is meshed 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 seat 1 under the meshing action of the gear shaft 8 and the positioning rack 7.

[0024] The mounting frame 4 is provided with a rotating shaft 11 on one side close to the placement seat 5, wherein 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 mounting frame 4 is provided with an infusion control mechanism on the outer wall, and the infusion control mechanism includes a first rack 9, which is mounted on 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, and 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, a liquid outlet pipe 16 and a connecting pipe 17 are rotationally sealed, and the connecting pipe 17 can also serve as a rotating shaft of the rotating frame 19. When the placement seat 5 moves toward the inside of the fixed seat 1, the rotating gear is in contact and meshing with the first rack 9, 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 in the liquid storage tank 25 is drawn into the liquid outlet pipe 16, and then enters the connecting pipe 17. The connecting pipe 17 is connected to the liquid outlet plate 26, and the coupling liquid is applied to the surface of the battery from the liquid outlet plate 26. The application action is performed when the battery on the top of the placement seat 5 enters the detection position, which effectively simplifies the coupling liquid application process.

[0025] 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.

[0026] 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.

[0027] Another mounting frame 4 is provided with a rotation control mechanism on its outer wall, the rotation control mechanism comprising a second rack 10, the second rack 10 and the third rack 14 are provided 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 meshed with the first gear 12 and the second gear 13, 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 a 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 from the liquid outlet plate 26 to the surface of the battery, until Until the placement seat 5 completely enters the internal detection position of the fixing seat 1 to perform charging and discharging, 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, and the liquid outlet plate 26 originally located below the rotating frame 19 is rotated to the top, and the cleaning mechanism installed on the top of the rotating frame 19 is rotated to the bottom. After the placement seat 5 exits the detection position, the cleaning mechanism cleans the coupling liquid applied on the surface of the battery; When the placement seat 5 enters the fixed seat 1 , the position of the rotating frame 19 is offset from the placement seat 5 , so the rotating frame 19 can rotate smoothly.

[0028] The cleaning mechanism includes a positioning shell 20, which is fixedly arranged on the top of the rotating frame 19, a rotating roller 21 is rotatably arranged inside the positioning shell 20, and a plurality of scrapers 22 are fixedly arranged 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 arranged on one side of the mounting frame 4. A positioning tube 24 is connected to the liquid inlet end of the liquid collecting tank 28. When the coupling liquid on the surface of the battery needs to be cleaned, the motor controls the rotating roller 21 to rotate, and the scraper 22 on the surface of the rotating roller 21 scrapes the coupling liquid to the inside of the positioning shell 20. Since the coupling liquid is in a gel state, it can be temporarily stored in the positioning shell 20; 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 is rotated 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.

[0029] 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 provided 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 rotates to the corresponding position, the positioning ball 29 is inserted into the positioning groove to position the rotating frame 19 to make it more stable.

[0030] 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.

[0031] 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.

[0032] One-way ratchet mechanisms are disposed 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 mechanisms of the first gear 12 and the second gear 13 can effectively reduce the number of rotations of the rotating frame 19 .

[0033] 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. The battery is first 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.

[0034] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A device for realizing nondestructive testing of lithium-ion batteries using ultrasonic phased array technology, comprising a fixing seat (1) and a hydraulic cylinder (2) mounted on the top of the fixing seat (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) are movably arranged on one side of the fixed seat (1), and a group of mounting frames (4) are fixedly arranged 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). The bottom of each of the placement seats (5) is provided with a positioning rack (7), 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 realizing 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 realizing 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; one end of a 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 a liquid storage tank (25); the liquid outlet end of the peristaltic pump body (15) is connected to the liquid outlet pipe (16); one end of the liquid outlet pipe (16) is connected to the connecting pipe (17).

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

5. The device for realizing nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 4, characterized in that: One-way ratchet mechanisms are 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 realizing 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 realizing 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 arranged on one side of the liquid outlet plate (26).

8. The device for realizing 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 a 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 realizing 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 realizing nondestructive testing of lithium-ion batteries using ultrasonic phased array technology according to claim 1, characterized in that: A positioning ball (29) is arranged 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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