Device for fixed laminated battery CT (Computed Tomography) detection

Abstract

The invention discloses a fixed laminated battery CT detection device, and particularly relates to the technical field of fixed laminated battery CT detection, and the fixed laminated battery CT detection device comprises a ray detection mechanism and a to-be-detected battery clamping mechanism; the ray detection mechanism comprises an X-ray source and a flat panel detector; the to-be-tested battery clamping mechanism comprises a clamping sleeve, a supporting rod, a guide plate, a spring and a rotating shaft; the clamping sleeve is provided with a groove for embedding a battery to be tested, the clamping sleeve is rotatably installed on the supporting rod through the rotating shaft, the spring is sleeved on the rotating shaft, one end of the spring is fixed with the supporting rod, and the other end of the spring is fixed with the rotating shaft. The device can detect one end of each pole piece, so that the stacking flatness and the spacing arrangement condition of the pole pieces can be observed, and the quality of a laminated battery can be obtained in an auxiliary manner.

Description

Technical Field

[0001] This application relates to the field of fixed-layer battery CT inspection technology, and in particular to a device for fixed-layer battery CT inspection. Background Technology

[0002] As new energy power batteries develop towards higher energy density and higher safety, stacking technology, due to its advantages such as uniform internal structure, high space utilization, and long cycle life, is gradually replacing winding technology as the mainstream technical route for square / pouch batteries. However, since a single cell contains dozens to hundreds of electrodes, each electrode needs to undergo processes such as slitting, stacking, and welding. The slitting process is prone to generating burrs and cross-sectional defects. Therefore, using computed tomography (CT) scans to control the internal quality of stacked batteries is currently one of the main and effective methods.

[0003] Existing industrial CT scanners typically fix stacked batteries inside the machine body for overall scanning and imaging. However, this application has the following drawbacks: 1. When the electrodes are stacked, quality problems mainly arise from uneven stacking (unevenness) or inconsistent spacing. Therefore, even after imaging the entire stacked battery, only the ends of the battery can be observed for judgment. The overall imaging process is not only time-consuming, but the large imaging area also results in poor image quality. Summary of the Invention

[0004] This invention provides a device for CT inspection of fixed stacked batteries. This device can inspect one end of the electrode to observe the flatness of the electrode stack and the spacing arrangement, thereby helping to determine the quality of the stacked battery.

[0005] The objective of this invention is achieved through the following technical solution: A device for CT inspection of fixed stacked batteries includes an X-ray inspection mechanism and a battery clamping mechanism; The radiation detection mechanism includes an X-ray source and a flat panel detector; the battery clamping mechanism includes a sleeve, a support rod, a guide plate, a spring, and a rotating shaft; the sleeve has a slot for embedding the battery under test, the sleeve is rotatably mounted on the support rod via the rotating shaft, the spring is sleeved on the rotating shaft, one end of the spring is fixed to the support rod, and the other end is fixed to the rotating shaft; The guide plate has a guide slope one and a guide slope two on the side where it fits with the ferrule. When the ferrule and guide slope one are fitted together, the right corner of the battery under test is located between the X-ray source and the flat panel detector. When the ferrule and guide slope two are fitted together, the left corner of the battery under test is located between the X-ray source and the flat panel detector.

[0006] Since the electrodes are manufactured using a standardized mold, their specifications will not differ. The device provided in this solution only needs to test one end of the battery under test during actual testing. However, each end of the battery under test has two corners, therefore, the battery needs to be rotated, and both corners need to be imaged and tested multiple times.

[0007] Preferably, the battery clamping mechanism further includes a drive assembly and a transmission assembly; the drive assembly includes a rotating motor and a rotating rod, the output ends of the rotating rod and the rotating motor are fixed, and guide blocks are provided at both ends of the rotating rod; the transmission assembly includes a transmission rod and a lever, the ends of the transmission rod and the lever are fixed; the lower end of the guide plate is provided with a left push block and a right push block, the left push block is located within the rotation range of the guide block, and the right push block is located within the rotation range of the lever, and when the guide block rotates, it intermittently transmits power to the transmission rod.

[0008] Preferably, the battery clamping mechanism also includes a slide rail, which has a groove adapted to the sliding of the support rod.

[0009] Preferably, the side end of the slide is provided with a limiting groove, and correspondingly, the side end of the support rod is provided with a protrusion that matches the limiting groove.

[0010] Preferably, the X-ray inspection mechanism also includes a mounting panel, a drive motor, and a rotating wheel. The output end of the drive motor is provided with a transmission screw, and the rotating wheel is provided with a gear assembly that meshes with the transmission screw. The rotating wheel and the mounting panel are synchronously connected for transmission.

[0011] Preferably, the gear assembly includes mounting posts and meshing rollers. The mounting posts are equidistantly arranged on the side end of the rotating wheel, and the meshing rollers are rotatably mounted on the mounting posts. A gap is formed between two adjacent meshing rollers to accommodate the embedded transmission screw teeth.

[0012] Preferably, the side end of the sleeve is provided with a groove, and a clamp is slidably fitted in the groove. The end of the clamp and the bottom of the groove are connected by a connecting spring.

[0013] Preferably, the device also includes an outer casing, and the free end of the slide rail is provided with a fixing rod, which is fixed to the inside of the outer casing.

[0014] Preferably, the outer casing is provided with a transparent observation window.

[0015] Compared with the prior art, the advantages or beneficial effects of the technical solution of this application include: 1. This solution, by setting up an X-ray inspection mechanism and a battery clamping mechanism, enables the inspection of both sides of the same end of the battery under test, thus obtaining the electrode arrangement and spacing of the stacked battery. The battery clamping mechanism allows switching between the two end corners of the stacked battery, which provides higher imaging accuracy and significantly reduces imaging time compared to traditional whole-cell imaging.

[0016] 2. After the X-ray source emits a cone-shaped beam of X-rays that penetrates the battery, the X-ray signal after penetration is received by a flat panel detector to generate a two-dimensional projection image. A high-resolution detector can capture micron-level defects (such as electrode wrinkles or metallic foreign objects), thus ensuring that the X-ray irradiation area surrounds the junction of the battery under test, resulting in better imaging. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a device for CT detection of fixed stacked batteries; Figure 2 A schematic diagram (front and side view) of the X-ray inspection mechanism and the battery clamping mechanism. Figure 3 This is a schematic diagram (back side) of the X-ray inspection mechanism and the battery clamping mechanism. Figure 4 A schematic diagram (top and side view) of the X-ray inspection mechanism and the battery clamping mechanism. Figure 5 This is a top view schematic diagram of the X-ray inspection mechanism and the battery clamping mechanism.

[0018] In the diagram: 1. Outer shell; 2. Transparent observation window; 3. Rotating wheel; 4. Meshing roller; 5. Transmission screw; 6. Drive motor; 7. Mounting panel; 8. X-ray source; 9. Battery under test; 10. Sleeve; 11. Support rod; 12. Limiting groove; 13. Slide groove; 14. Slide rail rod; 15. Fixing rod; 17. Right push block; 18. Transmission rod; 19. Toggle lever; 20. Rotating motor; 21. Rotating rod; 22. Guide block; 23. Left push block; 24. Guide plate; 25. Flat panel detector; 27. Clamp; 28. Spring. Detailed Implementation

[0019] The following detailed description of the embodiments of this application, in conjunction with the accompanying drawings, will provide a thorough understanding of how this application uses technical means to solve technical problems and achieve corresponding technical effects, enabling its implementation. The embodiments of this application and the various features within them can be combined with each other without conflict, and all resulting technical solutions are within the protection scope of this application.

[0020] It should be clearly stated that the embodiments described below are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] Example 1: This example provides a detailed explanation of the device scheme for CT detection of fixed stacked batteries: like Figures 1-5 As shown, a device for CT inspection of fixed stacked batteries includes an X-ray inspection mechanism and a battery clamping mechanism. The X-ray detection mechanism includes an X-ray source 8 and a flat panel detector 25; the battery clamping mechanism includes a sleeve 10, a support rod 11, a guide plate 24, a spring 28, and a rotating shaft; the sleeve 10 has a slot for embedding the battery 9 to be tested, the sleeve 10 is rotatably mounted on the support rod 11 via the rotating shaft, the spring 28 is sleeved on the rotating shaft, one end of the spring 28 is fixed to the support rod 11, and the other end is fixed to the rotating shaft; The guide plate 24 has a guide slope one and a guide slope two on the side that is in contact with the sleeve 10. When the sleeve 10 and the guide slope one are in contact, the right corner of the battery 9 to be tested is located between the X-ray source 8 and the flat panel detector 25. When the sleeve 10 and the guide slope two are in contact, the left corner of the battery 9 to be tested is located between the X-ray source 8 and the flat panel detector 25.

[0022] like Figure 2 As shown, the battery under test 9 is fixedly clamped by the sleeve 10, and one corner of the battery under test 9 is located between the X-ray source 8 and the flat panel detector 25. Figure 5 As shown, when the first guide slope on the upper side of the guide plate 24 is in contact with the side end of the sleeve 10, the right corner of the battery under test 9 is located within the scanning area between the X-ray source 8 and the flat panel detector 25. Similarly, when the guide plate 24 moves downward, causing the second guide slope to be in contact with the side end of the sleeve 10, the left corner of the battery under test 9 is located within the scanning area between the X-ray source 8 and the flat panel detector 25. Due to the action of the spring 28, the battery under test 9 on the sleeve 10 always tends to rotate to the left. Figure 5 The state is that after being guided by the second guide slope, the sleeve 10 rotates, and at this time the spring 28 twists and stores force.

[0023] like Figure 2As shown, the battery clamping mechanism under test also includes a drive assembly and a transmission assembly; the drive assembly includes a rotating motor 20 and a rotating rod 21, the output ends of the rotating rod 21 and the rotating motor 20 are fixed, and guide blocks 22 are provided at both ends of the rotating rod 21; the transmission assembly includes a transmission rod 18 and a lever 19, the ends of the transmission rod 18 and the lever 19 are fixed; the lower end of the guide plate 24 is provided with a left push block 23 and a right push block 17, the left push block 23 is located within the rotation range of the guide block 22, and the right push block 17 is located within the rotation range of the lever 19. When the guide block 22 rotates, it intermittently transmits power to the transmission rod 18.

[0024] During the rotation of the rotating rod 21, the guide block 22 fixed at its end contacts the left push block 23, thereby pushing the guide plate 24 to the left. When the guide block 22 and the left push block 23 are not in contact, the guide block 22 at the other end of the rotating rod 21 contacts the transmission rod 18, causing the transmission rod 18 to drive the lever 19 to rotate. During the rotation of the lever 19, it contacts the right push block 17 below the guide plate 24, thereby causing the guide plate 24 to move to the right. This process is repeated to achieve the left and right movement of the guide plate 24, thereby driving the two corner ends of the sleeve 10 to switch.

[0025] In this embodiment, the battery clamping mechanism also includes a slide rail 14, on which a groove 13 adapted to slide the support rod 11 is provided.

[0026] In this embodiment, a limiting groove 12 is provided on the side end of the slide groove 13, and correspondingly, a protrusion adapted to the limiting groove 12 is provided on the side end of the support rod 11.

[0027] like Figure 2 and Figure 3 As shown, the X-ray inspection mechanism also includes a mounting panel 7, a drive motor 6, and a rotating wheel 3. The output end 26 of the drive motor 6 is provided with a transmission screw 5, and the rotating wheel 3 is provided with a gear assembly that meshes with the transmission screw 5. The rotating wheel 3 and the mounting panel 7 are synchronously connected.

[0028] In this embodiment, the gear assembly includes mounting posts and meshing rollers 4. The mounting posts are equidistantly arranged on the side end of the rotating wheel 3, and the meshing rollers 4 are rolled on the mounting posts. A gap is formed between two adjacent meshing rollers 4 for the fitting transmission screw teeth 5 to be embedded in the transmission.

[0029] In this embodiment, the side end of the sleeve 10 is provided with a groove, and a clamp 27 is slidably disposed in the groove. The end of the clamp 27 and the bottom of the groove are connected by a connecting spring.

[0030] In this embodiment, the device also includes an outer shell 1, and a fixing rod 15 is provided at the free end of the slide rail rod 14. The fixing rod 15 is fixed inside the outer shell 1.

[0031] In this embodiment, the outer casing 1 is provided with a transparent observation window 2.

[0032] Example 2: Full Inspection System for Electrode Alignment in Power Battery Production Line Pain point: A leading battery manufacturer's square stacking production line (0.3 seconds / cell) needs to achieve online full inspection of electrode overhang (edge ​​alignment) within ±0.1mm. Traditional overall CT inspection takes 10 seconds per cell, with a missed detection rate as high as 18%, leading to a surge in short circuit risk after module assembly.

[0033] Device application process Automatic alignment installation: The battery to be tested 9 (size 150×100×25mm) is embedded in the slot of the sleeve 10. The position of the support rod 11 is adjusted by the sliding groove 13 (the protrusion engages with the limiting groove 12 to lock), so that the right corner of the battery is aligned with the X-ray source 8; the connecting spring drives the clamp 27 to press the four corners of the battery (pressure value 2.5N) to prevent electrode displacement. Figure 3 (Clamp structure); Dual-corner fast scan ( Figure 5 State Switching): Right Corner Scan (Guiding Surface - Fitting State). X-ray source 8 (160kV / 200μA) emits a cone-shaped beam of X-rays, and flat panel detector 25 acquires a 0.05mm resolution projection with a 2-second exposure. Figure 2 Position); AI algorithm calculates the maximum misalignment value of the electrode in real time (0.12mm > threshold 0.1mm, judged as NG); left corner scan (switching action), rotating motor 20 starts, guide block 22 pushes left push block 23 to drive Figure 5 The guide plate 24 moves to the left → releases the right-side positioning; the lever 19 simultaneously pushes the right push block 17, causing the guide plate 24 to move down to the guide slope and the two-sided drive sleeve 10 to rotate 30° (spring 28 stores energy), and the left corner enters the ray area (switching time 0.5 seconds); repeat the scan and compare the alignment difference on both sides (NG product marking audible and visual alarm); Dynamic adjustment and optimization: The drive motor 6 engages with the rollers 4 sets via the transmission screw 5 ( Figure 4 Adjust the tilt angle of the mounting panel 7 by ±5° to compensate for the deviation of the ray path caused by different battery thicknesses.

[0034] Quantitative results: The single cell inspection time has been reduced from the traditional 10 seconds to ≤5 seconds (2 seconds single-sided scan × 2 + 0.5 seconds switching), and the throughput of 12PPM supports 100% full inspection of the production line; GR&R repeatability is 8.3% (industry standard ≤10%), and the electrode misalignment missed detection rate has been reduced to 0.01%; more than 8 million yuan in losses due to thermal accidents caused by poor alignment are avoided annually.

[0035] Example 3: Analysis of Micro-wrinkle Defects in Solid-State Battery Development Research Needs: A laboratory developing sulfide solid-state stacked batteries needs to identify micron-level wrinkles (>50μm) on the electrodes after charge-discharge cycles, which can cause ion channel blockage. Traditional CT imaging methods suffer from differences in the imaging capabilities of copper and aluminum materials. Figure 3 Aluminum current collectors have only 30% of the grayscale value of copper, making it impossible to capture the depth of wrinkles.

[0036] Innovative Applications of Devices Local high-sensitivity scanning: After the battery is cycled (20 layers stacked), it is fixed in the sleeve 10. The support rod 11 is manually slidable to accurately position the target angle. The angle of the mounting panel 7 is adjusted by rotating the wheel 3 (drive motor 6 + meshing roller 4) so ​​that the X-ray source 8 and the flat panel detector 25 form a 15° angle, which enhances the imaging contrast of the wrinkled side. Dynamic energy compensation: When detecting aluminum current collectors, the system automatically increases the voltage of X-ray source 8 to 140kV (normal 80kV), the integration time of flat panel detector 25 increases by 50%, and the signal-to-noise ratio is improved by 40%; clamp 27, in conjunction with connecting spring, dynamically presses the tab area to suppress vibration displacement (displacement <1μm). 3D Reconstruction Algorithm: Based on dual-angle projection data (right corner + left corner), a local 3D model of the electrode is reconstructed through deep learning. Figure 5 (Red box area); Identify and label the wrinkle depth (62.5μm), length (1.2mm), and distribution density.

[0037] Technological breakthroughs: A linear relationship was discovered between the wrinkle depth and capacity decay of NCM electrode sheets after 100 charge-discharge cycles (R²=0.93); the local scanning range is only 15% of the overall CT scan, and a single detection takes 45 seconds (compared to 8 minutes in traditional methods); and direct data support is provided for the optimization of electrode sheet coating processes (toughening agent addition ratio).

Claims

1. A device for CT detection of fixed stacked batteries, characterized in that, Includes a radiation detection mechanism and a battery clamping mechanism; The radiation detection mechanism includes an X-ray source (8) and a flat panel detector (25). The battery clamping mechanism includes a sleeve (10), a support rod (11), a guide plate (24), a spring (28), and a rotating shaft; the sleeve (10) is provided with a groove for embedding the battery (9) under test, the sleeve (10) is rotatably mounted on the support rod (11) through the rotating shaft, the spring (28) is sleeved on the rotating shaft, one end of the spring (28) is fixed to the support rod (11), and the other end is fixed to the rotating shaft; The guide plate (24) is provided with guide slope one and guide slope two on the side that is in contact with the sleeve (10). When the sleeve (10) and guide slope one are in contact, the right corner of the battery (9) to be tested is located between the X-ray source (8) and the flat panel detector (25). When the sleeve (10) and guide slope two are in contact, the left corner of the battery (9) to be tested is located between the X-ray source (8) and the flat panel detector (25).

2. The device for CT detection of fixed stacked batteries according to claim 1, characterized in that, The battery clamping mechanism also includes a drive assembly and a transmission assembly; The drive assembly includes a rotary motor (20) and a rotating rod (21), the output ends of the rotating rod (21) and the rotary motor (20) are fixed, and guide blocks (22) are provided at both ends of the rotating rod (21); the transmission assembly includes a transmission rod (18) and a lever (19), the ends of the transmission rod (18) and the lever (19) are fixed; The lower end of the guide plate (24) is provided with a left push block (23) and a right push block (17). The left push block (23) is located within the rotation range of the guide block (22), and the right push block (17) is located within the rotation range of the lever (19). When the guide block (22) rotates, it intermittently transmits power to the transmission rod (18).

3. The device for CT detection of fixed stacked batteries according to claim 1, characterized in that, The battery clamping mechanism also includes a slide rail (14), on which a groove (13) is provided to accommodate the sliding of the support rod (11).

4. The device for CT detection of fixed stacked batteries according to claim 2, characterized in that, The side end of the slide groove (13) is provided with a limiting groove (12), and correspondingly, the side end of the support rod (11) is provided with a protrusion that matches the limiting groove (12).

5. The apparatus for CT detection of fixed stacked batteries according to claim 1, characterized in that, The X-ray inspection mechanism also includes a mounting panel (7), a drive motor (6) and a rotating wheel (3). The output end (26) of the drive motor (6) is provided with a transmission screw (5), and the rotating wheel (3) is provided with a gear assembly that meshes with the transmission screw (5). The rotating wheel (3) and the mounting panel (7) are synchronously connected.

6. The apparatus for CT detection of fixed stacked batteries according to claim 5, characterized in that, The gear assembly includes mounting posts and meshing rollers (4). The mounting posts are equidistantly arranged on the side of the rotating wheel (3). The meshing rollers (4) are rolled on the mounting posts. Adaptive transmission screws (5) are formed between two adjacent meshing rollers (4) to form a transmission gap.

7. The apparatus for CT detection of fixed stacked batteries according to claim 1, characterized in that, The sleeve (10) has a groove on its side, and a clamp (27) is slidably fitted in the groove. The end of the clamp (27) and the bottom of the groove are connected by a connecting spring.

8. The apparatus for CT detection of fixed stacked batteries according to claim 3, characterized in that, It also includes an outer shell (1), and the free end of the slide rail rod (14) is provided with a fixing rod (15), which is fixed inside the outer shell (1).

9. The apparatus for CT detection of fixed stacked batteries according to claim 1, characterized in that, A transparent observation window (2) is provided on the outer shell (1).

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