A small-angle CT detection device

Abstract

The present invention belongs to the technical field of lithium battery detection devices and provides a small-angle CT detection device. A driving mechanism is symmetrically arranged on a base, and the driving mechanism has an arc guide rail. A ray source and a detector are respectively arranged on the driving mechanism, and the ray source and the detector are respectively connected to a computer. A PLC control system controls the driving mechanism to drive the ray source and the detector to move synchronously on the arc guide rail to perform detection. The ray source and the detector transmit detection data to the computer, and the computer starts a preset calculation program to calculate the detection data and determine the detection result. The detection is controlled by an automated program, and no human intervention is required. The detection efficiency is high, the cost is low, the detection data is accurate and reliable, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery detection devices, and in particular relates to a small-angle CT detection device. Background Art

[0002] With the development of lithium battery technology, lithium batteries, as a form of new energy, are widely used in mobile phones, computers, vehicles and other fields. After assembly, lithium-ion batteries need to undergo product quality testing. Only products that meet various technical indicators can be put into use to ensure the safety of lithium batteries.

[0003] Lithium battery inspections include: positive and negative electrode sheet coverage detection, positive or negative electrode sheet alignment, distance between adjacent electrodes, total number of electrode count, and other required inspection items. Traditional inspection methods include manual visual inspection, surface inspection, and offline flaw detection. These methods have drawbacks such as low efficiency, high cost, and inaccurate test data.

[0004] Therefore, there is an urgent need for a small-angle CT detection device to solve the problems of low detection efficiency, high cost, inaccurate detection data, etc. in the above-mentioned traditional detection methods. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a small-angle CT detection device, comprising: a base, on which a drive mechanism is symmetrically arranged, and the drive mechanism has an arc guide rail; a radiation source and a detector are respectively provided on the drive mechanism, and the radiation source and the detector are respectively connected to a computer; a PLC control system controls the drive mechanism to drive the radiation source and the detector to move synchronously on the arc guide rail to perform detection, and the radiation source and the detector transmit detection data to the computer, and the computer activates a preset calculation program to calculate the detection data and determine the detection results.

[0006] Optionally, the PLC control system controls the driving mechanism to drive the ray source and the detector to swing back and forth 30 degrees synchronously on the circular arc guide rail.

[0007] Optionally, the centers of the two groups of circular arc guide rails of the symmetrically arranged driving mechanism coincide with each other.

[0008] Optionally, the driving mechanism includes a base, on which a driving device is installed, the driving device is connected to a screw device, the screw device is connected to a converter, the converter is installed with a bridge plate, and the radiation source or the detector is installed in front of the bridge plate; the converter is installed on a linear guide rail, the bridge plate is connected to the circular arc guide rail, the driving device drives the screw device to drive the converter to slide on the linear guide rail, and the converter can drive the bridge plate to slide on the circular arc guide rail in a telescopic and deformable manner.

[0009] Optionally, the converter includes a connecting block, a torque converter and a rotating disk, the torque converter is connected to the screw device via the connecting block, the rotating disk is rotatably mounted in front of the torque converter, and the bridge plate is mounted in front of the rotating disk.

[0010] Optionally, the torque converter includes a fixed seat, a cross roller bearing, a sliding seat and a transition plate, the sliding seat is slidably connected to the fixed seat through the cross roller bearing, the transition plate is installed in front of the sliding seat, and the transition plate is installed in cooperation with the rotating plate.

[0011] Optionally, the converter is mounted and connected to the linear guide rail via a first slider, and the bridge plate is mounted and connected to the circular arc guide rail via a second slider.

[0012] Optionally, the driving device is a motor, which is installed on the rear side of the base and is connected to the screw device via a belt.

[0013] Optionally, the screw device includes a screw and a threaded sleeve, the threaded sleeve is threadedly connected to the screw, the threaded sleeve is connected to the converter through a bolt, and both ends of the screw are respectively installed on a support seat, and the support seat is installed and connected to the base.

[0014] Optionally, an induction control device is installed on one side of the base, and the induction control device is connected to a PLC control system. The PLC control system controls the driving device to limit the movement range of the converter through the induction control device.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The small-angle CT detection device provided by the present invention has a driving mechanism symmetrically arranged on a base, the driving mechanism having an arc guide rail; a radiation source and a detector are respectively arranged on the driving mechanism, and the radiation source and the detector are respectively connected to a computer; a PLC control system controls the driving mechanism to drive the radiation source and the detector to move synchronously on the arc guide rail to perform detection, and the radiation source and the detector transmit detection data to the computer. The computer starts a preset calculation program to calculate the detection data and determine the detection result. The detection is controlled by the automated program, does not require human intervention, has high detection efficiency, low cost, accurate and reliable detection data, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of the small-angle CT detection device of the present invention;

[0018] Figure 2 Schematic diagram of the front view of the small-angle CT detection device of the present invention;

[0019] Figure 3 Schematic top view of the small-angle CT detection device of the present invention;

[0020] Figure 4 A schematic diagram of the structure of the drive mechanism of the present invention equipped with a radiation source;

[0021] Figure 5 A schematic diagram of the structure of the drive mechanism of the present invention equipped with a detector;

[0022] Figure 6 Schematic diagram of the overall structure of the driving mechanism of the present invention;

[0023] Figure 7 Schematic diagram of the explosion of the driving mechanism of the present invention;

[0024] Figure 8 is a front view schematic diagram of the driving mechanism of the present invention;

[0025] Figure 9 Schematic diagram of the overall structure of the converter of the present invention;

[0026] Figure 10 An exploded schematic diagram of the converter of the present invention;

[0027] Figure 11 Schematic diagram of the overall structure of the cross roller bearing of the present invention;

[0028] Figure 12 An exploded schematic diagram of the cross roller bearing of the present invention;

[0029] Figure 13 is a front schematic view of a cross roller bearing of the present invention;

[0030] Figure 14 AA is a cross-sectional schematic diagram of the cross roller bearing of the present invention;

[0031] Figure 15 It is a schematic diagram of the overall structure of the screw rod device of the present invention.

[0032] Illustration:

[0033] 100, base; 101, drive mechanism; 102, battery cell; 103, radiation source; 104, detector; 105, mounting plate; 106, mounting bracket; 200, base; 201, boss; 202, motor; 203, lead screw assembly; 204, motor base; 205, belt; 206, converter; 207, bridge plate; 208, linear guide rail; 209, first slider; 210, circular guide rail; 211, second slider; 212, connecting block;

[0034] 213, pitch converter; 214, rotating plate; 215, fixed seat; 216, cross roller bearing; 217, sliding seat; 218, transition plate; 219, bearing seat; 220, roller; 221, roller carrier; 222, groove;

[0035] 223. Support seat; 224. Screw rod; 225. Threaded sleeve; 226. Buffer; 227. Pulley; 228. Sensor; 229. Inductor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0038] Furthermore, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; internal communication between two components; and wireless or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described later can be combined with each other as long as they do not conflict with each other.

[0040] like Figure 1-15 An embodiment of the present invention provides a small-angle CT detection device, comprising a base 100 as a mounting body. Two drive mechanisms 101 are symmetrically arranged on the base 100. The drive mechanisms 101 are provided with arc guide rails 210. When the drive mechanisms 101 are mounted on the base 100, the arc guide rails 210 on the drive mechanisms 101 are arranged facing each other, and the centers of the two arc guide rails 210 coincide. The battery cell 102 is placed at the coincident center for detection. A battery cell 102 holder (not shown) for placing the battery cell 102 is provided on the base 100. The battery cell 102 can be placed at any angle or position on the battery cell 102 holder. That is, the small-angle CT detection device of the present invention accepts incoming battery cells 102 from any direction, and the battery cells finally land on the battery cell 102 holder for detection. The left and right drive mechanisms 101 are each equipped with a radiation source 103 and a detector 104. The radiation source 103 emits X-rays and is securely connected to the left drive mechanism 101 via a mounting plate 105. The detector 104 is a CT flat-panel detector and is securely connected to the right drive mechanism 101 via a mounting bracket 106. The synchronous movement of the drive mechanisms 101 causes the radiation source 103 and detector 104 to oscillate synchronously within a small angle, preferably 30 degrees. This 30-degree oscillation angle satisfies the testing device's requirements for performing various tests on the battery cells 102.

[0041] Furthermore, the radiation source 103 and the detector 104 are each connected to a computer (not shown). The radiation source 103 and the detector 104 can transmit detection data to the computer in real time. The computer has a preset calculation program for detecting various indicators of the battery cell 102 and determining whether the battery cell 102 is qualified, thereby realizing computer-programmed detection. A PLC control system (not shown) is connected to the drive mechanism 101, the radiation source 103, and the detector 104. The PLC control system controls the start and stop of the drive mechanism 101, the radiation source 103, and the detector 104 to realize automated detection. Specifically, the PLC control system controls the drive mechanism 101 to drive the radiation source 103 and the detector 104 to move synchronously on the circular arc guide rail 210. The PLC control system controls the radiation source 103 and the detector 104 to perform detection. The radiation source 103 and the detector 104 transmit the detection data to the computer, and the computer activates the preset calculation program to calculate the detection data and determine the detection results. The automatically controlled synchronously moving radiation source 103 and detector 104 perform item inspections on the battery cells 102, reducing inspection time and meeting the market's demand for online inspection. Item inspections can include inspections of the battery cell 102's appearance, inspections of the difference in coverage between the positive and negative electrodes, inspections of the alignment of the positive or negative electrodes, inspections of the distance between adjacent electrodes, and inspections of the total number of electrodes in the battery cell 102. The inspection items are extensive, effectively improving inspection efficiency, reducing inspection costs, and improving production efficiency. Different inspection parameters can be set on the computer and PLC control system for battery cells 102 of different specifications and models, including the swing angle, swing speed, synchronous uniform speed, or synchronous variable speed modes of the drive mechanism 101, for easy debugging and wide adaptability. Specific qualified judgment criteria need to be preset according to the specifications of different battery cells 102. Inspection data and judgment results are stored in the computer, and the data is archived and classified for easy query, thereby achieving control over the quality of the battery cells 102 and greatly improving the efficiency of product inspection and measurement.

[0042] Furthermore, the drive mechanism 101 includes a marble base 200 in a plate-like structure. A boss 201 is formed on the front of the base 200, and the back of the base 200 is a flat surface. A drive device is mounted on the back of the base 200, connected to a screw device 203. The drive device can be a motor 202, which is mounted on the back of the base 200 via a motor base 204. The motor 202 and the screw device 203 are connected by a belt 205. The screw device 203 is mounted on the left side of the front of the base 200 and is connected to a telescopic converter 206. The converter 206 is mounted on the right side of the screw device 203. A bridge plate 207, a plate structure, is installed in front of the converter 206. A set of linear guides 208 is installed in front of the base 200, to the right of the screw assembly 203. The converter 206 is slidably mounted on the linear guides 208 via a first slider 209. A set of arc guides 210 is mounted on the boss 201, and the bridge plate 207 is slidably mounted on the arc guides 210 via a second slider 211. The motor 202 drives the screw assembly 203 to drive the converter 206 to slide on the linear guides 208. The converter 206, in turn, can flexibly drive the bridge plate 207 to slide on the arc guides 210. The radiation source 103 and detector 104 move back and forth along the arc guides 210 with the bridge plate 207 to perform item testing on the battery cells 102, achieving rapid testing and improving testing efficiency. Furthermore, automated testing ensures accurate test data, reduces labor costs, and improves product efficiency.

[0043] Furthermore, converter 206 includes a block-shaped connecting block 212, a pitch converter 213, and a disc-shaped rotating disk 214. Pitch converter 213 is connected to screw assembly 203 via connecting block 212. Rotating disk 214 is rotatably mounted in front of pitch converter 213, and a bridge plate 207 is mounted in front of rotating disk 214. Pitch converter 213 is securely connected to first slider 209. Screw assembly 203 can drive connecting block 212 to move up and down, and connecting block 212 drives pitch converter 213 to slide on linear guide rail 208. The torque converter 213 includes a fixed seat 215, a cross roller bearing 216, a sliding seat 217 and a transition plate 218. The sliding seat 217 is slidably connected to the fixed seat 215 through the cross roller bearing 216. The transition plate 218 is fastened to the front of the sliding seat 217. The transition plate 218 is rotatably mounted on the rotating plate 214. The fixed seat 215 is fastened to the front of the first slider 209. Specifically, the cross roller bearing 216 includes two symmetrically arranged bearing seats 219, the two bearing seats 219 clamp the rollers 220, and the rollers 220 are held by roller racks 221. The rollers 220 are arranged crosswise on the roller racks 221, and a V-shaped groove 222 is formed on the bearing seat 219. When the two bearing seats 219 clamp the rollers 220, the rollers 220 are crosswise and orderly accommodated in the grooves 222 and do not fall out of the bearing seat 219. Among them, one bearing seat 219 is tightly connected to the fixed seat 215, and the other bearing seat 219 is tightly connected to the sliding seat 217. Under the action of the cross roller bearing 216, the sliding seat 217 can slide left and right relative to the fixed seat 215, thereby driving the transition plate 218 and the rotating plate 214 installed on the sliding seat 217 to slide left and right, and then the bridge plate 207 can slide up and down along the arc guide rail 210 under the action of the pitch converter 213 and the rotating plate 214.

[0044] Furthermore, the screw assembly 203 is mounted and connected to the base 200 via two block-shaped support bases 223. The screw assembly 203 includes a rod-shaped screw 224 and a threaded sleeve 225. The screw 224 is a precision threaded component. The threaded sleeve 225 is threadedly connected to the screw 224, and the threaded sleeve 225 is connected to the connecting block 212 via bolts. The ends of the screw 224 are rotatably mounted on the support bases 223, and the linear guide 208 is parallel to the screw assembly 203. Buffers 226 are mounted on both ends of the screw 224, and the buffers 226 are fixedly mounted on the inner side of the support bases 223. A pulley 227 can be provided at the upper end of the screw 224, which cooperates with the belt 205 to transmit the power to the motor 202. The motor 202 drives the screw rod 224, which pushes the connecting block 212 to move up and down. The connecting block 212 drives the pitch converter 213 to slide up and down on the linear guide rail 208. The pitch converter 213 can move and change its shape to drive the bridge plate 207 to slide up and down on the arc guide rail 210.

[0045] Furthermore, to facilitate the automation of the drive mechanism 101 and improve detection efficiency, an inductive control device (not shown) is installed on the left side of the base 200. The inductive control device is connected to a PLC control system, which controls the motor 202 through the inductive control device. Specifically, the inductive control device includes two sensors 228 and one sensor 229. The sensors 228 are symmetrically arranged on both sides of the sensor 229 along the axis of the screw rod 224. The sensor 229 is installed on the left side of the connecting block 212. The inductive control device limits the travel of the converter 206. When the sensor 229 moves to the position of the sensor 228, the sensor 228 instructs the PLC control system to stop the motor 202, which can protect the equipment and extend its service life.

[0046] The present invention provides a small-angle CT detection device: a motor drives a lead screw to drive the ray source and the detector to swing in a small-angle arc with the center of the circular arc guide rail as the center, so as to meet the subsequent projection angle and set the CT projection angle; the ray source emits X-rays, which penetrate the interior of the battery cell, and the receiving end receives the X-rays and forms an image and performs a rapid CT photo with the detector. The X-ray image and the CT photo are collected at the same location and at the same time. At the same time, the principle of compressed sensing is used to calculate the CT reconstructed image using a small-angle reconstruction algorithm that minimizes the total variation of the image for the CT photo; the X-ray image and the CT reconstructed image are processed and automatically analyzed by computer-related software. Determine whether the battery cell is qualified; realize the synchronous arc swing of the radiation source and the detector through the driving mechanism, meet the motion accuracy requirements of CT detection, reduce imaging time, avoid errors caused by object movement during imaging, improve image registration and fusion, and extract the actual measurement cross-section of the battery cell from the three-dimensional image; solve the following problems existing in the existing detection method: First, poor imaging quality, image overlap, and low density resolution; second, when the tab is close to the corner of the battery cell, the tab will interfere with the imaging and cannot be detected; third, it cannot truly detect the alignment of the stacked battery cells, and the measured value is not the actual value. When the battery cells are stacked irregularly, the misjudgment is greater.

[0047] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A small-angle CT detection device, characterized in that: include: A base, wherein a driving mechanism is symmetrically arranged on the base, and the driving mechanism has an arc guide rail; a radiation source and a detector are respectively arranged on the driving mechanism, and the radiation source and the detector are respectively connected to a computer; a PLC control system controls the driving mechanism to drive the radiation source and the detector to move synchronously on the arc guide rail to perform detection, and the radiation source and the detector transmit detection data to the computer, and the computer activates a preset calculation program to calculate the detection data and determine the detection result; The driving mechanism includes a base, on which a driving device is installed, the driving device is connected to a screw device, the screw device is connected to a converter, the converter is installed with a bridge plate, and the radiation source or the detector is installed in front of the bridge plate; the converter is installed on a linear guide rail, the bridge plate is connected to the circular guide rail, the driving device drives the screw device to drive the converter to slide on the linear guide rail, and the converter can drive the bridge plate to slide on the circular guide rail in a telescopic manner; The PLC control system controls the driving mechanism to drive the ray source and the detector to swing back and forth 30 degrees synchronously on the circular arc guide rail; The centers of the two groups of circular arc guide rails of the symmetrically arranged driving mechanism coincide with each other.

2. The small-angle CT detection device according to claim 1, wherein: The converter includes a connecting block, a pitch converter and a rotating disk. The pitch converter is connected to the screw device through the connecting block. The rotating disk is rotatably mounted in front of the pitch converter. The bridge plate is mounted in front of the rotating disk.

3. The small-angle CT detection device according to claim 2, wherein: The pitch converter includes a fixed seat, a cross roller bearing, a sliding seat and a transition plate. The sliding seat is slidably connected to the fixed seat through the cross roller bearing. The transition plate is installed in front of the sliding seat and is installed in cooperation with the rotating plate.

4. The small-angle CT detection device according to claim 3, wherein: The converter is installed and connected to the linear guide rail through a first slider, and the bridge plate is installed and connected to the circular arc guide rail through a second slider.

5. The small-angle CT detection device according to claim 4, characterized in that: The driving device is a motor, which is installed on the rear side of the base and is connected to the screw device via a belt.

6. The small-angle CT detection device according to claim 5, characterized in that: The screw device includes a screw and a threaded sleeve, the threaded sleeve is threadedly connected to the screw, and the threaded sleeve is connected to the converter through a bolt. The two ends of the screw are respectively installed on a support seat, and the support seat is installed and connected to the base.

7. The small-angle CT detection device according to claim 6, wherein: An induction control device is installed on one side of the base, and the induction control device is connected to the PLC control system. The PLC control system controls the driving device to limit the moving stroke of the converter through the induction control device.

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