Battery detection method, device, production method, equipment and medium

Abstract

This application provides a battery testing method, apparatus, manufacturing method, equipment, and medium, belonging to the field of batteries. The method includes: acquiring a test image of the battery under test, wherein the test image is an image of the battery under test captured by the X-ray detector during at least two relative movements between the battery under test and the X-ray detector; in one relative movement between the battery under test and the X-ray detector, a first side extends along the movement direction; in another relative movement between the battery under test and the X-ray detector, a second side extends along the movement direction; determining defect information of the battery under test based on the test image; and determining a quality inspection result of the battery under test based on the defect information. By performing at least two movements, the influence of distortion at at least four sides can be reduced, thereby improving the overall testing accuracy of the battery under test.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method, apparatus, production method, equipment and medium for testing batteries. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Batteries may develop defects during production or use. Some of these defects may not be visible from the outside of the battery and require internal inspection.

[0004] In related technologies, when inspecting batteries, the images of the battery's sides are prone to distortion, resulting in low accuracy in defect detection. Summary of the Invention

[0005] This application aims to at least address one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery detection method, apparatus, manufacturing method, equipment, and medium to improve the accuracy of battery defect detection.

[0006] An embodiment of the first aspect of this application provides a method for testing a battery. The battery under test is a stacked battery, and the battery under test includes a first surface having adjacent first and second sides. The method includes: acquiring a test image of the battery under test, wherein the test image is an image of the battery under test captured by the X-ray detector during at least two relative movements between the battery under test and the X-ray detector, wherein in one relative movement between the battery under test and the X-ray detector, the first side extends along the movement direction, and in another relative movement between the battery under test and the X-ray detector, the second side extends along the movement direction; determining defect information of the battery under test based on the test image; and determining a quality inspection result of the battery under test based on the defect information of the battery under test.

[0007] In the technical solution of this application embodiment, since the detection image is the image of the battery under test acquired by the X-ray detector when there are at least two relative movements between the battery under test and the X-ray detector, and in one of the relative movements between the battery under test and the X-ray detector, the first side extends along the movement direction, and in the other relative movement between the battery under test and the X-ray detector, the second side extends along the movement direction, the influence of distortion at at least four sides can be reduced through at least two movements, thereby improving the detection accuracy of the entire battery under test.

[0008] In some embodiments, the battery under test is located on a support platform, and the X-ray detector includes a X-ray source and a detector opposite to the exit port of the X-ray source. Acquiring a detection image of the battery under test includes: controlling the movement of the support platform; responding to the battery under test being located between the X-ray source and its corresponding detector, controlling the X-ray source to emit X-rays that pass through the battery under test and are projected onto the detector; and determining the detection image of the battery under test based on the X-rays received by the detector. Controlling the movement of the support platform, thereby controlling the movement of the battery under test, is more convenient. When the battery under test is located between the X-ray source and the detector, during defect detection of the battery under test, the angle between the X-ray and the surface where the detection point of the battery under test is located can be made as close to 90° as possible, thereby reducing distortion in the detection image and making the detection image closer to the actual condition of the battery under test. By detecting defects in the corners of the battery under test through the detection image, the detection of internal defects of the battery under test is more comprehensive, improving detection accuracy.

[0009] In some embodiments, the support platform is connected to a ring-shaped guide rail, which includes a first part and a second part connected together. The extending direction of one of the first and second parts is parallel to the extending direction of a first side, and the extending direction of the other of the first and second parts is parallel to the extending direction of a second side. Controlling the movement of the support platform includes controlling the operation of the ring-shaped guide rail. By setting the ring-shaped guide rail and controlling the movement of the battery under test through the ring-shaped guide rail, it is possible to achieve different movement directions of the battery under test in two separate movements, which is more convenient.

[0010] In some embodiments, the radiation source includes a first radiation source and a second radiation source spaced apart, and the detector includes a first detector and a second detector. The first detector is opposite to the exit port of the first radiation source, and the second detector is opposite to the exit port of the second radiation source. A first portion is located between the first detector and the first radiation source, and a second portion is located between the second detector and the second radiation source. In response to the battery under test being located between the radiation source and its corresponding detector, the radiation source is controlled to emit radiation that passes through the battery under test and is projected onto the detector. This includes: in response to the battery under test being located between the first radiation source and the first detector, controlling the first radiation source to emit radiation that passes through the battery under test and is projected onto the first detector; and in response to the battery under test being located between the second radiation source and the second detector, controlling the second radiation source to emit radiation that passes through the battery under test and is projected onto the second detector. The first radiation source and the first detector are configured to detect the battery under test during its first movement, and the second radiation source and the second detector are configured to detect the battery under test during its second movement. That is, different radiation sources and detectors are used for detection during the two movements of the battery under test, which eliminates the need for the radiation source and detector to move with the battery under test, making it more convenient. Continuous detection can also be achieved, resulting in higher detection efficiency.

[0011] In some embodiments, determining a detection image of the battery under test based on the radiation received by the detector includes: determining a first detection image of the battery under test based on the radiation received by a first detector; determining a second detection image of the battery under test based on the radiation received by a second detector; and determining a detection image based on the first and second detection images. The first detector receives radiation emitted by a first radiation source during the first movement of the battery under test, and the second detector receives radiation emitted by a second radiation source during the second movement of the battery under test. The two radiations are imaged separately by two radiation sources and two detectors, without mutual interference.

[0012] In some embodiments, the support platform is rotatable, with its rotation center axis perpendicular to its surface. The rotation angle of the support platform is greater than or equal to the angle between the first and second sides. Controlling the movement of the support platform includes: controlling the first side of the battery under test to extend along a first direction; controlling the support platform to move along the first direction; controlling the support platform to rotate so that the second side of the battery under test extends along a second direction, wherein the first and second directions are parallel but opposite; and controlling the support platform to move along the second direction. By rotating the support platform, the movement direction of the battery under test can be the same in two movements, but the relative position between the X-ray detector and the battery under test changes, allowing the X-ray detector to obtain detection images of the battery under test during two different movement processes. That is, detection images of the battery under test during two different movement processes can be obtained by a single X-ray detector, and the movement trajectory of the support platform is short, resulting in a smaller overall size of the detection device.

[0013] In some embodiments, the radiation source includes an integrated radiation source. Integrated radiation sources have a low repair rate, high stability, small size, and simple maintenance. Setting the radiation source as an integrated radiation source improves the reliability of the detection device.

[0014] In some embodiments, the detector includes a TDI detector. TDI detectors offer better imaging, making the detected image closer to the real situation and further improving detection accuracy. Simultaneously, TDI detectors can output high-quality images even in darker environments, which also improves detection accuracy.

[0015] In some embodiments, acquiring a test image of the battery under test includes: controlling a X-ray detector to acquire a raw image including the battery under test; and processing the raw image to obtain a test image of the battery under test. The raw image is an unprocessed image, in which case the battery under test is not clear enough. After processing multiple raw images, the battery under test in the image becomes clearer and its defects are more easily identified.

[0016] In some embodiments, processing the original image to obtain a detection image includes: filtering the original image to obtain a filtered image; denoising the filtered image to obtain a denoised image; and cropping a detection region from the denoised image to obtain a detection image, wherein the detection region includes the region containing the battery under test. Filtering and denoising can improve the signal-to-noise ratio of the original image. The original image includes not only the battery under test but also images of other components. In the embodiments of this application, cropping the region containing the battery under test reduces subsequent calculations and minimizes the impact of errors in other components on the detection of defects in the battery under test.

[0017] In some embodiments, determining defect information of the battery under test based on the inspection image includes: determining the number and / or size of defects in the battery under test based on the inspection image; and determining defect information of the battery under test based on the number and / or size of defects. Both the number and size of defects are standards for measuring defects in the battery under test. The number of defects is the sum of the total number of all defects in the battery under test, and the size of a defect is the individual size of each defect.

[0018] In some embodiments, determining the quality inspection result of the battery under test based on defect information includes: determining that the battery under test is unqualified in response to the number of defects exceeding a preset number. When the number of defects exceeds the preset number, it indicates that there are many defects in the battery under test, and the battery under test is determined to be unqualified.

[0019] In some embodiments, determining the quality inspection result of the battery under test based on defect information includes: determining that the battery under test is unqualified in response to any defect size being larger than a preset size. When a defect size is larger than a preset size, it indicates that the defect size in the battery under test is large, and the battery under test is determined to be unqualified.

[0020] An embodiment of the second aspect of this application provides a battery testing apparatus. The battery under test is a stacked battery, and the battery under test includes a first surface having adjacent first and second sides. The apparatus includes: an acquisition module configured to acquire a test image of the battery under test, wherein the test image is an image of the battery under test captured by the X-ray detector during at least two relative movements between the battery under test and the X-ray detector, wherein the first side extends along the movement direction during one of the relative movements between the battery under test and the X-ray detector, and the second side extends along the movement direction during another relative movement between the battery under test and the X-ray detector; a first determination module configured to determine defect information of the battery under test based on the test image; and a second determination module configured to determine a quality inspection result of the battery under test based on the defect information of the battery under test.

[0021] An embodiment of the third aspect of this application provides a battery manufacturing method, the method comprising: testing the quality of a battery under test using any of the methods described in the above embodiments to determine the quality test result of the battery under test. The battery manufacturing method provided by the embodiments of this application can identify defects in the battery under test, and can determine the quality of the battery under test based on these defects.

[0022] In some embodiments, the method further includes: rejecting unqualified batteries in response to a quality inspection result indicating that the battery under test is unqualified. The quality of the battery under test can be determined based on the quality inspection result, and unqualified batteries can be rejected, thereby improving the stability of the device or equipment using the battery.

[0023] An embodiment of the fourth aspect of this application provides an electronic device, the electronic device including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform a battery detection method or a battery production method of any of the above embodiments.

[0024] An embodiment of the fifth aspect of this application provides a battery manufacturing apparatus, including the electronic equipment described in the above embodiments.

[0025] An embodiment of the sixth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a battery detection method or a battery production method according to any of the above embodiments.

[0026] An embodiment of the seventh aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements a battery detection method or a battery production method as described in any of the above embodiments.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0028] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0029] Figure 1This is a flowchart of a battery detection method according to some embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the structure of the detection device for detecting the battery under test according to some embodiments of this application;

[0031] Figure 3 This is a schematic diagram of the structure of the detection device for detecting the battery under test according to some embodiments of this application;

[0032] Figure 4 This is a flowchart of step S10 in some embodiments of this application;

[0033] Figure 5 This is a schematic diagram of the structure of the detection device for detecting the battery under test according to some embodiments of this application;

[0034] Figure 6 This is a schematic diagram of the structure of the detection device for detecting the battery under test according to some embodiments of this application;

[0035] Figure 7 This is a flowchart of step S12 in some embodiments of this application;

[0036] Figure 8 This is a flowchart of step S13 in some embodiments of this application;

[0037] Figure 9 This is a flowchart of step S11 in some embodiments of this application;

[0038] Figure 10 This is a flowchart of step S10 in some embodiments of this application;

[0039] Figure 11 This is a flowchart of step S15 in some embodiments of this application;

[0040] Figure 12 This is a flowchart of step S20 in some embodiments of this application;

[0041] Figure 13 This is a flowchart of step S30 in some embodiments of this application;

[0042] Figure 14 This is a flowchart of a battery detection method according to some embodiments of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Battery under test; 101. First surface; 1011. First side; 1012. Second side; 1013. Third side; 1014. Fourth side; 200. Support platform; 300. X-ray detector; 301. X-ray source; 3011. First X-ray source; 3012. Second X-ray source; 302. Detector; 3021. First detector; 3022. Second detector; 400. Circular guide rail; 401. First part; 402. Second part. Detailed Implementation

[0045] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0051] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0054] During the production and use of batteries, defects may occur. For example, during battery production, defects such as electrode wrinkles, folds, or breakage may occur; during battery use, the battery may be bumped or knocked, causing the electrodes to break. These defects are not visible from the outside of the battery and require internal inspection.

[0055] The rays emitted by the X-ray source pass through the battery and are detected by the detector, forming a corresponding detection image. When the rays emitted by the X-ray source are perpendicular to the surface of the battery being detected, the actual length of the rays passing through the battery is equal to the battery's thickness, resulting in a relatively accurate detection image. When the angle between the rays emitted by the X-ray source and the surface of the battery being detected is less than 90°, the actual length of the rays passing through the battery is greater than the battery's thickness, leading to some distortion in the detection image. The smaller the angle between the rays and the surface of the battery being detected, the greater the distortion.

[0056] In related technologies, when inspecting batteries, the X-ray source corresponds to the middle of the battery. Since the sides of the battery are relatively far out, the angle between the X-ray emitted by the X-ray source and the surface near the side of the battery is small, resulting in large distortion of the inspection image. When analyzing the inspection image, due to the certain difference between the inspection image and the actual situation of the battery, there are cases of missed detection and false detection, resulting in low accuracy of battery defect detection.

[0057] This application provides a battery testing method, comprising: acquiring a test image of the battery under test; determining defect information of the battery under test based on the test image; and determining a quality inspection result of the battery under test based on the defect information. The test image is an image of the battery under test acquired by the X-ray detector during at least two relative movements between the battery under test and the X-ray detector. In one relative movement between the battery under test and the X-ray detector, a first side extends along the movement direction; in another relative movement between the battery under test and the X-ray detector, a second side extends along the movement direction. By performing at least two movements, the influence of distortion at at least four sides can be reduced, thereby improving the overall testing accuracy of the battery under test.

[0058] The battery testing method disclosed in this application can test batteries that have just been manufactured, as well as batteries that have been used for a period of time, thereby improving the accuracy of internal battery testing and reducing the problems of missed detections and false detections.

[0059] This application provides a method for detecting batteries. Figure 1 This is a flowchart illustrating a battery detection method according to some embodiments of this application. See also... Figure 1 The methods include:

[0060] Step S10: Obtain the detection image of the battery to be tested.

[0061] Step S20: Determine the defect information of the battery under test based on the detected image.

[0062] Step S30: Determine the quality inspection result of the battery under test based on the defect information of the battery under test.

[0063] In the embodiments of this application, the battery under test 100 is a stacked battery. Figure 2 This is a schematic diagram of the structure of the detection device for detecting the battery under test according to some embodiments of this application. Figure 3 This is a schematic diagram illustrating the structure of a detection device for detecting a battery under test, as shown in some embodiments of this application. See also... Figure 2 and Figure 3 The battery under test 100 includes a first surface 101, which has adjacent first side 1011 and second side 1012. Exemplarily, the first surface 101 also has a third side 1013 and a fourth side 1014, where the third side 1013 is adjacent to the second side 1012 and opposite to the first side 1011, and the fourth side 1014 is adjacent to the first side 1011 and opposite to the second side 1012.

[0064] The stacked battery is shaped like a cuboid. The battery under test 100 has two large surfaces arranged opposite each other, and four side surfaces connecting the two large surfaces. In one implementation of this application, the first surface 101 can be one of the large surfaces of the battery under test 100.

[0065] In some embodiments of this application, the detection device includes a support platform 200 and a radiation detector 300. For example, when using the detection device to detect the battery 100 under test, the battery 100 can be placed on the support platform 200 such that the large surface (e.g., the first surface 101) of the battery 100 is in contact with the support surface of the support platform 200, that is, the thickness direction of the battery 100 is perpendicular to the support surface, and then the radiation detector 300 is used to detect the battery 100 under test.

[0066] In the embodiments of this application, the detected image is an image of the battery under test 100 acquired by the X-ray detector 300 when there are at least two relative movements between the battery under test 100 and the X-ray detector 300. In one of the relative movements between the battery under test 100 and the X-ray detector 300, the first side 1011 extends along the movement direction X; in the other relative movement between the battery under test 100 and the X-ray detector 300, the second side 1012 extends along the movement direction X. Figure 2 This can be understood as one of the relative movements between the battery under test 100 and the X-ray detector 300, wherein the first side 1011 extends along the movement direction X. Figure 3 This can be understood as another relative movement between the battery under test 100 and the X-ray detector 300, during which the second side 1012 extends along the movement direction X. Figure 2 and Figure 3 In the detection, the direction of movement X can be the same or different.

[0067] In the embodiments of this application, when the battery under test 100 and the X-ray detector 300 move relative to each other, the battery under test 100 can move while the X-ray detector 300 remains stationary, the X-ray detector 300 can move while the battery under test 100 remains stationary, or the battery under test 100 and the X-ray detector 300 can move simultaneously, but the moving speed of the battery under test 100 and the moving speed of the X-ray detector 300 are different. During the relative movement between the battery under test 100 and the X-ray detector 300, for the X-ray detector 300 to be able to detect the battery under test 100, that is, for the X-ray emitted by the X-ray source 301 of the X-ray detector 300 to pass through the battery under test 100 and be detected by the detector 302 of the X-ray detector 300, the battery under test 100 needs to pass between the X-ray source 301 and the detector 302. The stationary and moving states mentioned in the embodiments of this application are all relative to the ground.

[0068] In this embodiment, the moving direction X refers to the moving direction of the battery under test 100 relative to the X-ray detector 300. When the battery under test 100 moves and the X-ray detector 300 is stationary, the moving direction X is the moving direction of the battery under test 100. When the X-ray detector 300 moves and the battery under test 100 is stationary, the moving direction X is opposite to the moving direction of the X-ray detector 300. When the battery under test 100 moves and the X-ray detector 300 moves simultaneously, the moving direction X is determined according to the moving speed of the battery under test 100 and the moving speed of the X-ray detector 300.

[0069] In the embodiments of this application, Figure 2 and Figure 3 The X-ray detector 300 shown can be the same X-ray detector or different X-ray detectors. That is, during the two relative movements between the battery under test 100 and the X-ray detector 300, the same X-ray detector 300 can detect the battery under test 100, or two separate X-ray detectors 300 can detect the battery under test 100.

[0070] For example, in Figure 2In the process, the first side 1011 extends along the moving direction X, and the second side 1012 intersects the moving direction X. During the detection process, the distance between the second side 1012 and the X-ray detector 300 will change. When the distance between the second side 1012 and the X-ray detector 300 is the smallest, the second side 1012 moves between the X-ray source 301 and the detector 302 of the X-ray detector 300. At this time, the second side 1012 is detected. This allows the angle between the X-ray emitted by the X-ray source 301 and the first surface 101 where the second side 1012 is located to be as close as possible to 90° when the X-ray passes through the first surface 101 and the second side 1012. This minimizes the influence of distortion on the detection results and improves the accuracy of defect detection of the second side 1012. Similarly, when the fourth side 1014 is moved between the radiation source 301 and the detector 302 of the radiation detector 300, the fourth side 1014 is detected, which can improve the accuracy of defect detection of the fourth side 1014.

[0071] Figure 2 The detection method shown not only improves the accuracy of defect detection on the second side 1012 and the fourth side 1014, but also, since the battery under test 100 is movable, when any detection line parallel to the second side 1012 in the battery under test 100 moves between the X-ray source 301 and the detector 302 of the X-ray detector 300, that detection line can be detected, which also improves the detection accuracy of that detection line, and thus improves the detection accuracy of the entire battery under test 100. The detection line represents a line segment connecting multiple detection points on the first surface 101.

[0072] In the embodiments of this application, using Figure 2 For example, by adjusting the position, the center line of the rays emitted by the X-ray source 301 can pass through the midpoint of the second side 1012. When detecting the fourth side 1014, the center line of the rays emitted by the X-ray source 301 can also pass through the midpoint of the fourth side 1014.

[0073] In the embodiments of this application, using Figure 2 For example, during detection, the angle between the ray and the first surface 101 where the center of the second side 1012 is located is 90°, meaning the distortion at the center of the second side 1012 is minimal. However, the distortion at the endpoints on both sides of the second side 1012 is greater, meaning the distortion of the first side 1011 and the third side 1013 is larger. Therefore, in the embodiments of this application, at least two movements are set. Figure 3In this process, the distortion of the first side 1011 and the third side 1013 can be reduced, improving the accuracy of defect detection on the first side 1011 and the third side 1013, while also improving the detection accuracy of the detection line parallel to the first side 1011. At least these two detections can optimize the detection results of the battery under test 100, reducing the impact of distortion, thus improving the overall detection accuracy of the battery under test 100.

[0074] In the embodiments of this application, the description of the improved detection accuracy of the first side 1011 and the third side 1013 is the same as the description of the improved detection accuracy of the second side 1012 and the fourth side 1014 above. The embodiments of this application will not repeat the description.

[0075] In the embodiments of this application, by Figure 2 The detection scheme shown can improve the accuracy of defect detection on the second side 1012 and the fourth side 1014, as well as the detection accuracy of the detection line parallel to the second side 1012; through Figure 3 The detection scheme shown can improve the accuracy of defect detection on the first side 1011 and the third side 1013, as well as the detection accuracy of the detection line parallel to the first side 1011, thus achieving detection of the entire battery under test 100. By moving at least twice, the influence of distortion at the four sides can be reduced, thereby improving the detection accuracy of the entire battery under test 100.

[0076] In the embodiments of this application, the defect information of the battery under test 100 includes morphological defects such as wrinkles, breaks and overlaps of the electrode sheets.

[0077] In this embodiment of the application, the quality inspection result of the battery under test 100 is used to indicate whether the battery under test 100 is qualified.

[0078] In this embodiment of the application, if the electrode of the battery under test 100 has wrinkles or breaks, a grayscale change will appear in the detection image, and the defect information of the battery under test 100 can be determined based on the grayscale change of the detection image.

[0079] In the embodiments of this application, the detector 302 can be calibrated before detection begins to reduce errors in the detected image. For example, the detector 302 needs to be calibrated before formal operation. Before calibration, it must be ensured that there are no impurities at the exit port of the X-ray source 301 and on the surface of the detector 302, and that there are no obstructions between the X-ray source 301 and the detector 302. The X-rays must fully cover the receiving surface of the detector 302. The grayscale value of the image formed by the detection device at this time can be adjusted to the calibrated grayscale value.

[0080] In the embodiments of this application, since the detection image is the image of the battery under test 100 acquired by the X-ray detector 300 when there are at least two relative movements between the battery under test 100 and the X-ray detector 300, and in one of the relative movements between the battery under test 100 and the X-ray detector 300, the first side 1011 extends along the movement direction X, and in the other relative movement between the battery under test 100 and the X-ray detector 300, the second side 1012 extends along the movement direction X. Through at least two movements, the influence of distortion at at least four sides can be reduced, thereby improving the detection accuracy of the entire battery under test 100.

[0081] According to some embodiments of this application, see Figure 2 and Figure 3 The battery under test 100 is located on the support platform 200, and the radiation detector 300 includes a radiation source 301 and a detector 302 opposite to the emission port of the radiation source 301.

[0082] Figure 4 This is a flowchart of step S10 in some embodiments of this application. See also... Figure 4 Step S10 includes:

[0083] Step S11: Control the movement of the support platform.

[0084] Step S12: In response to the fact that the battery under test is located between the X-ray source and its corresponding detector, control the X-ray source to emit X-rays that pass through the battery under test and project onto the detector.

[0085] Step S13: Determine the detection image of the battery under test based on the rays received by the detector.

[0086] In the embodiments of this application, the rays emitted by the ray source 301 of the ray detector 300 are all penetrating. The attenuation of rays by materials of different thicknesses is different, resulting in different amounts of rays detected by the detector 302 of the ray detector 300. The detector 302 contains a layer of photoluminescent material. After receiving rays, the photosensitive material emits light, and the light signal is transmitted to the photoelectric converter to form an electrical signal. The digital signal is then output through the internal electrical signal transmission circuit, representing the contrast between light and dark areas in the image. Rays attenuate after passing through the detected object. The more rays pass through, the more light the photosensitive material emits, resulting in a brighter area in the final image; conversely, fewer rays pass through, resulting in a darker area in the image.

[0087] In the implementation of this application, the battery under test 100 is smaller in size, and controlling the movement of the battery under test 100 is more convenient than controlling the movement of the X-ray detector 300.

[0088] In the embodiments of this application, the support platform 200 is movable and is used to place the battery under test 100, which facilitates the movement of the battery under test 100. The movement trajectory of the support platform 200 passes between the radiation source 301 and the detector 302, so that the radiation emitted by the radiation source 301 can pass through the battery under test 100 on the support platform 200 and be received by the detector 302, thereby realizing the detection of the battery under test 100.

[0089] In the embodiments of this application, a robotic arm can be used to grasp the battery 100 under test onto a support platform 200, and the support platform 200 moves the battery 100 under test to the testing station. During the process of the robotic arm grasping the battery 100 under test, it is necessary to ensure the accuracy of the grasping position in order to ensure the imaging quality in the later stage and provide more accurate raw information for subsequent processing.

[0090] In the embodiments of this application, a soft device can be provided at the gripping point of the robotic arm to reduce damage to the battery 100 under test during the gripping process. A limiting block can be provided on the support platform 200 to enhance the stability of the battery 100 under test throughout the entire mechanical movement process.

[0091] In the embodiments of this application, the movement of the battery under test 100 is controlled by controlling the movement of the support platform 200, which is more convenient. When the battery under test 100 is located between the X-ray source 301 and the detector 302, during defect detection of the battery under test 100, the angle between the X-ray and the surface where the detection point of the battery under test 100 is located can be made as close as possible to 90°, thereby reducing distortion in the detection image and making the detection image closer to the actual condition of the battery under test 100. By detecting defects in the corners of the battery under test 100 through the detection image, the detection of internal defects of the battery under test 100 is more comprehensive, improving the detection accuracy.

[0092] According to some embodiments of this application, Figure 5 This is a schematic diagram of the structure of the detection device for detecting the battery under test according to some embodiments of this application. Figure 6 This is a schematic diagram illustrating the structure of a detection device for detecting a battery under test, as shown in some embodiments of this application. See also... Figure 5 and Figure 6 The detection device also includes an annular guide rail 400, and the support platform 200 is connected to the annular guide rail 400. The annular guide rail 400 includes a first part 401 and a second part 402 connected together. The extension direction of one of the first part 401 and the second part 402 is parallel to the extension direction of the first side 1011, and the extension direction of the other part of the first part 401 and the second part 402 is parallel to the extension direction of the second side 1012.

[0093] In an embodiment of this application, step S11 includes:

[0094] Step S111: Control the operation of the circular guide rail.

[0095] In the embodiments of this application, the annular guide rail 400 is shaped like a rounded rectangle. The annular guide rail 400 rotates cyclically during operation. The first part 401 and the second part 402 can correspond to two adjacent sides of the rounded rectangle; that is, the extending directions of the first part 401 and the second part 402 are different. Figure 5 and Figure 6 The rotation direction of the middle annular guide rail 400 is A.

[0096] In the embodiments of this application, the extending direction of one of the first portion 401 and the second portion 402 is parallel to the extending direction of the first side 1011, and the extending direction of the other of the first portion 401 and the second portion 402 is parallel to the extending direction of the second side 1012. This means that during the same movement of the battery under test 100, the extending directions of the first portion 401 and the second portion 402 are different. For example, with Figure 5 and Figure 6 For example, the direction of movement of the battery under test 100 is different in the two instances, for example in Figure 5 In the first movement of the battery under test 100 (e.g., the movement direction X of the battery under test 100 is parallel to the extension direction of the first part 401), the extension direction of the first part 401 is parallel to the extension direction of the first side 1011, and the extension direction of the second part 402 is parallel to the extension direction of the second side 1012; for example, in Figure 6 In the second movement of the battery under test 100 (for example, the movement direction X of the battery under test 100 is parallel to the extension direction of the second part 402), the extension direction of the first part 401 is parallel to the extension direction of the second side 1012, and the extension direction of the second part 402 is parallel to the extension direction of the first side 1011.

[0097] In the embodiments of this application, the extension direction of the first part 401 and the extension direction of the second part 402 can be adjusted according to the moving direction X of the battery under test 100, so that the extension direction of the first part 401 and the extension direction of the second part 402 match the moving direction X of the battery under test 100 twice.

[0098] In the embodiments of this application, by setting an annular guide rail 400, the movement of the battery under test 100 can be controlled by the annular guide rail 400, and the movement direction X of the battery under test 100 can be different in two movements, which is more convenient.

[0099] In embodiments of this application, the support platform 200 can also be a conveyor belt, on which the battery under test 100 can be placed. Alternatively, the support platform 200 can be connected to the circular guide rail 400, and the support platform 200 can move with the circular guide rail 400. When the conveyor belt or the circular guide rail 400 moves, it drives the battery under test 100 located on the conveyor belt or the circular guide rail 400 to move, which can realize continuous testing and improve testing efficiency.

[0100] According to some embodiments of this application, see Figure 5 and Figure 6 The radiation source 301 includes a first radiation source 3011 and a second radiation source 3012 arranged at intervals. The detector 302 includes a first detector 3021 and a second detector 3022. The first detector 3021 is opposite to the emission port of the first radiation source 3011, and the second detector 3022 is opposite to the emission port of the second radiation source 3012. The first part 401 is located between the first detector 3021 and the first radiation source 3011, and the second part 402 is located between the second detector 3022 and the second radiation source 3012. Figure 5 and Figure 6 The detection device shown is only an example, and only the annular guide rail 400, the support platform 200, the first radiation source 3011, the second radiation source 3012, the first detector 3021 and the second detector 3022 are shown. Other components are not shown, such as the fixing components.

[0101] Figure 7 This is a flowchart of step S12 in some embodiments of this application. See also... Figure 7 Step S12 includes:

[0102] Step S121: In response to the battery under test being located between the first X-ray source and the first detector, control the first X-ray source to emit X-rays that pass through the battery under test and project onto the first detector.

[0103] Step S122: In response to the fact that the battery under test is located between the second radiation source and the second detector, control the second radiation source to emit radiation that passes through the battery under test and is projected onto the second detector.

[0104] In the embodiments of this application, the first radiation source 3011 and the first detector 3021 are matched to detect the battery under test 100 during the first movement of the battery under test 100, and the second radiation source 3012 and the second detector 3022 are matched to detect the battery under test 100 during the second movement of the battery under test 100.

[0105] In the embodiments of this application, using Figure 5For example, by adjusting the position, when the first radiation source 3011 detects the second side 1012, the center line of the radiation emitted by the first radiation source 3011 passes through the midpoint of the second side 1012. Figure 6 For example, when the second radiation source 3012 detects the first side 1011, the center line of the radiation emitted by the second radiation source 3012 passes through the midpoint of the first side 1011.

[0106] In the embodiments of this application, the electron lens focuses the electron beam onto a point on the target as the ray focus.

[0107] In the embodiments of this application, the first radiation source 3011 and the second radiation source 3012 can be located on the same side of the support platform 200 as the battery under test 100.

[0108] In the embodiments of this application, a first radiation source 3011 and a first detector 3021 are used to detect the battery 100 under test during its first movement, and a second radiation source 3012 and a second detector 3022 are used to detect the battery 100 under test during its second movement. That is, different radiation sources 301 and detectors 302 are used for detection during the two movements of the battery 100 under test. This eliminates the need for the radiation sources 301 and detectors 302 to move with the battery 100 under test, making it more convenient. Simultaneously, continuous detection can be achieved, resulting in higher detection efficiency.

[0109] According to some embodiments of this application, Figure 8 This is a flowchart of step S13 in some embodiments of this application. See also... Figure 8 Step S13 includes:

[0110] Step S131: Determine the first detection image of the battery under test based on the rays received by the first detector.

[0111] Step S132: Determine the second detection image of the battery under test based on the rays received by the second detector.

[0112] Step S133: Determine the detection image based on the first detection image and the second detection image.

[0113] In the embodiments of this application, the rays emitted by the first X-ray source 3011 pass through the battery under test 100 moving along the first direction and are received by the first detector 3021. Based on the rays received by the first detector 3021, a first detection image of the battery under test 100 during its movement along the first direction can be determined. The rays emitted by the second X-ray source 3012 pass through the battery under test 100 moving along the second direction and are received by the second detector 3022. Based on the rays received by the second detector 3022, a second detection image of the battery under test 100 during its movement along the second direction can be determined.

[0114] In the embodiments of this application, the above steps S131 and S132 are not sequential. Step S132 can be performed simultaneously with step S131, or step S132 can be performed before step S131, or step S132 can be performed after step S131.

[0115] In the embodiments of this application, the first detector 3021 receives the rays emitted by the first X-ray source 3011 during the first movement of the battery under test 100, and the second detector 3022 receives the rays emitted by the second X-ray source 3012 during the second movement of the battery under test 100. The two rays are imaged by the two X-ray sources 301 and the two detectors 302 respectively, without interfering with each other.

[0116] In the above embodiment, the support platform 200 is connected to the annular guide rail 400, and the movement of the support platform 200 is controlled by the annular guide rail 400. That is, the movement direction X of the support platform 200 in two movements is intersecting. In other implementations, the movement direction X of the support platform 200 in two movements can be parallel.

[0117] According to some embodiments of this application, the support platform 200 is rotatable, the rotation center axis of the support platform 200 is perpendicular to the surface of the support platform 200, and the rotation angle of the support platform 200 is greater than or equal to the included angle between the first side 1011 and the second side 1012.

[0118] Figure 9 This is a flowchart of step S11 in some embodiments of this application. See also... Figure 9 Step S11 includes:

[0119] Step S112: By controlling the first side of the battery under test to extend along the first direction.

[0120] Step S113: Control the support platform to move along the first direction.

[0121] Step S114: Control the rotation of the support platform so that the second side of the battery under test extends along the second direction, wherein the first direction is parallel to the second direction but opposite in direction.

[0122] Step S115: Control the support platform to move along the second direction.

[0123] In the embodiments of this application, during the process of testing the battery 100 under test by the above method, the movement directions X of the two movements of the battery 100 under test are parallel but opposite, that is, the movement trajectory of the support platform 200 is only one.

[0124] In the embodiments of this application, by rotating the support platform 200, the direction of movement X of the battery under test 100 can be the same in two movements, but the relative position between the X-ray detector 300 and the battery under test 100 changes, so that the X-ray detector 300 can obtain detection images of the battery under test 100 in two different movement processes. That is, detection images of the battery under test 100 in two different movement processes can be obtained by one X-ray detector 300, and the movement trajectory of the support platform 200 is relatively short, resulting in a smaller overall volume of the detection device.

[0125] According to some embodiments of this application, the radiation source 301 includes an integral radiation source.

[0126] In some implementations of this application, the first radiation source 3011 and the second radiation source 3012 can be radiation sources of different types of radiation. For example, one of the first radiation source 3011 and the second radiation source 3012 can be an X-ray source, and the other of the first radiation source 3011 and the second radiation source 3012 can be an alpha radiation source; or one of the first radiation source 3011 and the second radiation source 3012 can be an alpha radiation source, and the other of the first radiation source 3011 and the second radiation source 3012 can be a beta radiation source, or other combinations thereof. The embodiments of this application do not limit this.

[0127] For example, one of the first radiation source 3011 and the second radiation source 3012 may be an integrated radiation source; or both the first radiation source 3011 and the second radiation source 3012 may be integrated radiation sources.

[0128] For example, the first X-ray source 3011 and the second X-ray source 3012 can both be closed-tube integrated X-ray tubes. The higher the voltage of the X-ray source, the better the penetration and the thicker the layers that can be detected; the smaller the focal diameter of the X-ray source, the greater the magnification, the higher the image resolution, and the clearer the detected image. The voltage and focal diameter of the X-ray source can be selected according to the detection requirements.

[0129] Integrated X-ray sources have a low repair rate, high stability, small size, and simple maintenance. Setting the X-ray source as an integrated X-ray source improves the reliability of the detection device.

[0130] According to some embodiments of this application, detector 302 includes a TDI (Time Delay Integration) detector.

[0131] In one implementation of this application, the first detector 3021 and the second detector 3022 can be the same detector. For example, one of the first detector 3021 and the second detector 3022 is a flat panel detector and the other is a TDI detector; or both the first detector 3021 and the second detector 3022 are TDI detectors.

[0132] The TDI detector is a linear image sensor that achieves high-speed, high-resolution image acquisition by aligning the pixel rows of the image sensor perpendicular to the direction of motion of the object being detected. The TDI detector converts received X-ray energy into a recordable electrical signal. By measuring the amount of X-ray received by the TDI detector, an electrical signal proportional to the amount of X-ray is generated, thereby forming a corresponding image. For example, the TDI detector may include three parts: a X-ray conversion module, a photoelectric conversion module, and a signal readout and transmission module. During the detection process of the battery 100 under test, the battery 100 is placed within the X-ray radiation area of ​​the X-ray source 301. The X-rays emitted by the X-ray source 301 exit through the X-ray irradiation window, pass through the battery 100, and are projected onto the TDI detector. The TDI detector receives the X-rays that have passed through the battery 100 and images the battery 100.

[0133] As the object to be detected moves, the TDI detector calculates the integration time for each row of pixels based on the object's speed and the number of pixel rows, thus dividing the image of the object into multiple rows. When the ray passes through each row of pixels, the relevant circuit adds the charge of that row's pixel to the charge of the previous row's pixel, obtaining the sum of the charge values ​​of the current pixel and the previous row's pixels. In this way, when the charge values ​​of all rows of pixels are added together, a detection image of the rapidly moving object can be obtained.

[0134] In related technologies, since the X-ray source 301 emits a conical beam, when the battery under test 100 is tested, it will cause severe distortion at the edge position of the battery under test 100. However, since the TDI detector has a narrow single-row pixel imaging width, the X-ray is almost perpendicular to the image during imaging. Therefore, for the part of the pixel row parallel to the TDI detector, the effect of improving edge distortion is more obvious.

[0135] TDI detectors offer superior imaging, resulting in images that more closely resemble reality and thus improving detection accuracy. Furthermore, TDI detectors can output high-quality images even in low-light conditions, further enhancing detection accuracy.

[0136] For example, a TDI detector includes N rows of pixels (which can be understood as N rows of sensing areas). Each time an object passes through a single row of sensing areas, an imaging signal is generated. Finally, the imaging signals from each row of sensing areas are superimposed and enhanced. The more rows of sensing areas in a TDI detector, the better the signal enhancement effect and the better the detected image.

[0137] The embodiments of this application can increase the number of integration operations and reduce the acquisition time by designing the number of sensing areas of the TDI detector. Simultaneously, combined with the continuous movement of the battery under test 100, continuous scanning of the battery under test 100 is achieved, improving detection efficiency.

[0138] In the embodiments of this application, since the TDI detector can output high-quality images even in darker environments, the scanning speed can be increased accordingly under the premise of limited radiation intensity, thereby improving efficiency; or the radiation intensity can be reduced under constant speed scanning to save resources and reduce costs.

[0139] According to some embodiments of this application, Figure 10 This is a flowchart of step S10 in some embodiments of this application. See also... Figure 10 Step S10 includes:

[0140] Step S14: Control the X-ray detector to acquire raw images including the battery under test.

[0141] Step S15: Process the original image to obtain the detection image of the battery to be tested.

[0142] In the embodiments of this application, the original image may be a fused image of two images acquired during two movements.

[0143] In the embodiments of this application, the original image is an unprocessed image. At this time, the battery under test 100 in the image is not clear enough. After processing multiple original images, the battery under test 100 in the image becomes clearer and the defects of the battery under test 100 are more easily identified.

[0144] According to some embodiments of this application, Figure 11 This is a flowchart of step S15 in some embodiments of this application. See also... Figure 11 Step S15 includes:

[0145] Step S151: Filter the original image to obtain a filtered image.

[0146] Step S152: Perform noise reduction processing on the filtered image to obtain a noise-reduced image.

[0147] Step S153: Extract the detection region from the denoised image to obtain the detection image. The detection region includes the area containing the battery to be tested.

[0148] In the embodiments of this application, the filtering process may include mean filtering, Gaussian filtering, etc. This can remove irrelevant information from multiple original images and improve the signal-to-noise ratio of the original images.

[0149] In this embodiment of the application, a denoised image is obtained by denoising the filtered image. By removing random noise such as quantum noise, aliasing noise, and electronic noise from the filtered image, the signal-to-noise ratio of the filtered image is greatly improved.

[0150] The original image includes not only the battery under test 100, but also images of other components. In the embodiments of this application, the area containing the battery under test 100 is extracted. This can reduce subsequent calculations and reduce the impact of errors in other components on the detection of defects in the battery under test 100.

[0151] According to some embodiments of this application, Figure 12 This is a flowchart of step S20 in some embodiments of this application. See also... Figure 12 Step S20 includes:

[0152] Step S21: Determine the number and / or size of defects in the battery under test based on the detection image.

[0153] Step S22: Determine the defect information of the battery under test based on the number of defects and / or the size of defects.

[0154] In the embodiments of this application, the number of defects and the size of defects are both standards for measuring the defects of the battery under test 100. The number of defects is the sum of the number of all defects in the battery under test 100, and the size of defects is the size of each individual defect.

[0155] According to some embodiments of this application, Figure 13 This is a flowchart of step S30 in some embodiments of this application. See also... Figure 13 Step S30 includes:

[0156] Step S31: In response to the number of defects exceeding the preset number, determine that the battery under test is unqualified.

[0157] In the embodiments of this application, when the number of defects is greater than a preset number, it indicates that there are many defects in the battery under test 100, and the battery under test 100 is determined to be unqualified.

[0158] According to some embodiments of this application, see Figure 13 Step S30 includes:

[0159] Step S32: In response to any defect size being larger than a preset size, determine that the battery under test is unqualified.

[0160] In the embodiments of this application, when the defect size is larger than the preset size, it indicates that the defect size in the battery under test 100 is large, and the battery under test 100 is determined to be unqualified.

[0161] According to some embodiments of this application, see Figure 13 Step S30 also includes:

[0162] Step S33: In response to the number of defects being less than or equal to a preset number and the defect size being less than or equal to a preset size, determine that the battery under test is qualified.

[0163] It should be noted that the above steps are an explanation of the defect detection for each battery under test 100. In practical applications, defect detection can be carried out on multiple batteries under test 100 throughout the entire process, that is, continuous detection can be achieved.

[0164] In the embodiments of this application, the effectiveness of the detection device is calibrated before detection. A test battery is made from various sizes and types of defect samples to be detected according to the detection requirements. The test battery is tested before the inspection begins. If the defects on the test battery can be judged by the algorithm and marked as NG products, the detection device is effective. Otherwise, the device detection needs to be suspended until the algorithm is debugged and all defects are judged as NG.

[0165] In the embodiments of this application, the defect detection image can be specifically calibrated and identified before detection, and the defect can be automatically identified and judged by artificial intelligence (AI) algorithms.

[0166] In the embodiments of this application, each detection process can be fed back to the AI ​​algorithm, which can continuously optimize the identification and judgment of defects based on each detection process, thereby improving the accuracy of defect identification.

[0167] For example, once a defect is identified, it can be marked to facilitate staff observation.

[0168] According to some embodiments of this application, the extension direction of the first side 1011 is perpendicular to the extension direction of the second side 1012, that is, the moving direction X is perpendicular to the extension direction of the sensing area of ​​the TDI detector, which facilitates the planning of the moving trajectory of the battery under test 100.

[0169] Some embodiments of this application provide a battery testing device. The battery under test is a stacked battery, and the battery under test includes a first surface having adjacent first and second sides. The device includes: an acquisition module, a first determination module, and a second determination module. The acquisition module is configured to acquire a test image of the battery under test. The test image is an image of the battery under test captured by the X-ray detector during at least two relative movements between the battery under test and the X-ray detector. In one relative movement between the battery under test and the X-ray detector, the first side extends along the movement direction, and in another relative movement between the battery under test and the X-ray detector, the second side extends along the movement direction. The first determination module is configured to determine defect information of the battery under test based on the test image. The second determination module is configured to determine the quality inspection result of the battery under test based on the defect information of the battery under test.

[0170] According to some embodiments of this application, the battery under test is located on a support platform, the X-ray detector includes a X-ray source and a detector opposite to the exit port of the X-ray source, and the acquisition module includes: a first control unit configured to control the movement of the support platform; a second control unit configured to control the X-ray source to emit X-rays through the battery under test and project them onto the detector in response to the battery under test being located between the X-ray source and its corresponding detector; and a first determination unit configured to determine a detection image of the battery under test based on the X-rays received by the detector.

[0171] According to some embodiments of this application, the support platform is connected to a ring guide rail, the ring guide rail including a connected first part and a second part, one of the first part and the second part extending in a direction parallel to the extension direction of a first side, and the other of the first part and the second part extending in a direction parallel to the extension direction of a second side, and a first control unit is further configured to control the operation of the ring guide rail.

[0172] According to some embodiments of this application, the radiation source includes a first radiation source and a second radiation source spaced apart, and the detector includes a first detector and a second detector. The first detector is opposite to the exit port of the first radiation source, and the second detector is opposite to the exit port of the second radiation source. A first portion is located between the first detector and the first radiation source, and a second portion is located between the second detector and the second radiation source. The second control unit includes: a first sub-control unit configured to control the first radiation source to emit radiation through the battery under test and project it onto the first detector in response to the battery under test being located between the first radiation source and the first detector; and a second sub-control unit configured to control the second radiation source to emit radiation through the battery under test and project it onto the second detector in response to the battery under test being located between the second radiation source and the second detector.

[0173] According to some embodiments of this application, a first determining unit includes: a first sub-determining unit configured to determine a first detection image of the battery under test based on the rays received by a first detector; a second sub-determining unit configured to determine a second detection image of the battery under test based on the rays received by a second detector; and a third sub-determining unit configured to determine a detection image based on the first detection image and the second detection image.

[0174] According to some embodiments of this application, the support platform is rotatable, the rotation center axis of the support platform is perpendicular to the surface of the support platform, and the rotation angle of the support platform is greater than or equal to the included angle between the first side and the second side. The first control unit includes: a fourth sub-determining unit configured to control the first side of the battery under test to extend along a first direction; a fifth sub-determining unit configured to control the support platform to move along the first direction; a sixth sub-determining unit configured to control the rotation of the support platform so that the second side of the battery under test extends along a second direction, wherein the first direction is parallel to the second direction but opposite in direction; and a seventh sub-determining unit configured to control the support platform to move along the second direction.

[0175] According to some embodiments of this application, the radiation source includes an integrated radiation source.

[0176] According to some embodiments of this application, the detector includes a TDI detector.

[0177] According to some embodiments of this application, the acquisition module includes: a third control unit configured to control the X-ray detector to acquire an original image including the battery under test; and a processing unit configured to process the original image to obtain a detection image of the battery under test.

[0178] According to some embodiments of this application, the processing unit includes: a filtering subunit configured to filter the original image to obtain a filtered image; a noise reduction subunit configured to perform noise reduction on the filtered image to obtain a noise-reduced image; and a cropping subunit configured to crop a detection region in the noise-reduced image to obtain a detection image, wherein the detection region includes a region containing the battery to be tested.

[0179] According to some embodiments of this application, the first determining module includes: a second determining unit configured to determine the number of defects and / or the size of defects in the battery under test based on a detection image; and a third determining unit configured to determine defect information of the battery under test based on the number of defects and / or the size of defects.

[0180] According to some embodiments of this application, the second determining module includes: a fourth determining unit, configured to determine that the battery under test is unqualified in response to the number of defects being greater than a preset number.

[0181] According to some embodiments of this application, the second determining module includes: a fifth determining unit, configured to determine that the battery under test is unqualified in response to any one of the defect sizes being larger than a preset size.

[0182] According to some embodiments of this application, the extension direction of the first side is perpendicular to the extension direction of the second side.

[0183] Specific limitations regarding the battery testing device can be found in the limitations of the battery testing method described above, and will not be repeated here. Each module in the aforementioned battery testing device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in the electronic device in hardware form, or stored in the memory of the electronic device in software form, so that the processor can call and execute the operations corresponding to each module.

[0184] Embodiments of this application also provide a method for manufacturing a battery, the method comprising:

[0185] Step S40: Use any of the methods described in the above embodiments to test the quality of the battery under test, so as to determine the quality test result of the battery under test.

[0186] The battery manufacturing method provided in this application embodiment can determine the defects of the battery under test 100, and the quality of the battery under test 100 can be determined based on the defects of the battery under test 100.

[0187] According to some embodiments of this application, the method further includes:

[0188] Step S50: In response to the quality inspection result of the battery under test being unqualified, the unqualified battery is removed.

[0189] In this embodiment of the application, the quality of the battery under test 100 can be determined based on the quality test results of the battery under test 100, and unqualified batteries can be eliminated to improve the stability of the device or equipment using the battery.

[0190] For example, batteries that pass the inspection can proceed to the next process.

[0191] This application provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the battery detection method or the battery production method described in the above embodiments.

[0192] According to some embodiments of this application, battery manufacturing equipment includes the electronic equipment described in the above embodiments.

[0193] This application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery detection method or the battery production method described in the above embodiments.

[0194] This application provides a computer program product, including a computer program that, when executed by a processor, implements the battery detection method or the battery production method described in the above embodiments.

[0195] Embodiments of this application also provide a battery testing method, wherein the battery under test 100 is a stacked battery, the battery under test 100 has a first surface 101, and the first surface 101 has adjacent first side edges 1011 and second side edges 1012. The testing device includes a support platform 200, an X-ray detector 300, and an annular guide rail 400. The support platform 200 is connected to the annular guide rail 400, and the annular guide rail 400 includes a connected first portion 401 and a second portion 402. The first portion 401 extends along a first direction, and the second portion 402 extends along a second direction. The radiation detector 300 includes a first radiation source 3011 and a second radiation source 3012 arranged at intervals, as well as a first detector 3021 and a second detector 3022. The first detector 3021 is opposite to the emission port of the first radiation source 3011, and the second detector 3022 is opposite to the emission port of the second radiation source 3012. A first part 401 is located between the first detector 3021 and the first radiation source 3011, and a second part 402 is located between the second detector 3022 and the second radiation source 3012.

[0196] Figure 14 This is a flowchart illustrating a battery detection method according to some embodiments of this application. See also... Figure 14 The method includes:

[0197] Step S61: Control the ring guide rail to work, so that the bearing platform moves along the first direction.

[0198] The battery under test 100 is placed on the support platform 200, with the first side 1011 extending along the first direction and the second side 1012 extending along the second direction.

[0199] Step S62: In response to the battery under test being located between the first X-ray source and the first detector, control the first X-ray source to emit X-rays that pass through the battery under test and project onto the first detector.

[0200] Step S63: Determine the first detection image of the battery under test based on the rays received by the first detector.

[0201] Step S64: Control the ring guide rail to work, so that the bearing platform moves along the second direction.

[0202] The battery under test 100 is placed on the support platform 200, with the first side 1011 extending along the second direction and the second side 1012 extending along the first direction.

[0203] Step S65: In response to the battery under test being located between the second X-ray source and the second detector, control the second X-ray source to emit X-rays that pass through the battery under test and project onto the second detector.

[0204] Step S66: Determine the second detection image of the battery under test based on the rays received by the second detector.

[0205] Step S67: Determine the detection image based on the first detection image and the second detection image.

[0206] Step S68: Determine the defect information of the battery under test based on the detected image.

[0207] Step S69: Determine the quality inspection result of the battery under test based on the defect information of the battery under test.

[0208] The embodiments of this application provide two sets of X-ray sources 301 and detectors 302 to detect the first surface 101 of the battery under test from two directions. It can continuously and automatically acquire detection images, and realize continuous and automated full detection of internal electrode defects of the battery under test through algorithm filtering and software automatic identification and judgment functions, thereby improving detection efficiency and detection accuracy.

[0209] In the embodiments of this application, imaging parameters, such as X-ray tube voltage and current, and the frame rate, number of frames, and gain of detector 302, can be adjusted according to detection requirements.

[0210] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing a battery, wherein the battery under test is a stacked battery, the battery under test includes a first surface, the first surface having adjacent first and second side edges, characterized in that, The method includes: Acquire detection images of the battery under test, wherein the detection images are images of the battery under test collected by the X-ray detector during at least two relative movements between the battery under test and the X-ray detector, the X-ray detector including two X-ray sources and two detectors, the detector including a time delay integral (TDI) detector, wherein in one relative movement between the battery under test and the X-ray detector including a first X-ray source and a first detector, the first side extends along the movement direction, and in another relative movement between the battery under test and the X-ray detector including a second X-ray source and a second detector, the second side extends along the movement direction; Defect information of the battery under test is determined based on the detected image; The quality inspection result of the battery under test is determined based on the defect information of the battery under test.

2. The method according to claim 1, characterized in that, The battery under test is located on a support platform. The exit port of the first X-ray source is opposite to the first detector, and the exit port of the second X-ray source is opposite to the second detector. Acquiring a detection image of the battery under test includes: Control the movement of the carrier platform; In response to the fact that the battery under test is located between the radiation source and its corresponding detector, the radiation source is controlled to emit radiation that passes through the battery under test and is projected onto the detector; The detector determines the detection image of the battery under test based on the rays received by the detector.

3. The method according to claim 2, characterized in that, The support platform is connected to an annular guide rail, which includes a connected first part and a second part. The extending direction of one of the first part and the second part is parallel to the extending direction of the first side, and the extending direction of the other of the first part and the second part is parallel to the extending direction of the second side. Controlling the movement of the support platform includes: Control the operation of the annular guide rail.

4. The method according to claim 3, characterized in that, The first radiation source and the second radiation source are spaced apart, with the first portion located between the first detector and the first radiation source, and the second portion located between the second detector and the second radiation source. In response to the battery under test being located between the radiation source and its corresponding detector, the radiation source is controlled to emit radiation that passes through the battery under test and is projected onto the detector, including: In response to the fact that the battery under test is located between the first radiation source and the first detector, the first radiation source is controlled to emit radiation that passes through the battery under test and is projected onto the first detector; In response to the fact that the battery under test is located between the second radiation source and the second detector, the second radiation source is controlled to emit radiation that passes through the battery under test and is projected onto the second detector.

5. The method according to claim 4, characterized in that, Determining a detection image of the battery under test based on the rays received by the detector includes: A first detection image of the battery under test is determined based on the rays received by the first detector; A second detection image of the battery under test is determined based on the rays received by the second detector; The detection image is determined based on the first detection image and the second detection image.

6. The method according to claim 2, characterized in that, The supporting platform is rotatable, the rotation center axis of the supporting platform is perpendicular to the surface of the supporting platform, and the rotation angle of the supporting platform is greater than or equal to the angle between the first side and the second side. Controlling the movement of the supporting platform includes: The first side edge of the battery under test is extended along a first direction by control. Control the support platform to move along the first direction; The carrier platform is controlled to rotate so that the second side of the battery under test extends along the second direction, wherein the first direction is parallel to the second direction but opposite in direction; Control the carrier platform to move along the second direction.

7. The method according to any one of claims 2 to 6, characterized in that, The radiation source includes an integrated radiation source.

8. The method according to any one of claims 1 to 6, characterized in that, Acquiring a detection image of the battery under test includes: The X-ray detector is controlled to acquire raw images including the battery under test; The original image is processed to obtain the detection image of the battery under test.

9. The method according to claim 8, characterized in that, The process of processing the original image to obtain the detected image includes: The original image is filtered to obtain a filtered image; The filtered image is then subjected to noise reduction processing to obtain a denoised image; The detection region is extracted from the denoised image to obtain the detection image, wherein the detection region includes the area containing the battery to be tested.

10. The method according to any one of claims 1 to 6, characterized in that, Determining defect information of the battery under test based on the detected image includes: The number and / or size of defects in the battery under test are determined based on the detected images. The defect information of the battery under test is determined based on the number of defects and / or the size of the defects.

11. The method according to claim 10, characterized in that, Determining the quality inspection result of the battery under test based on its defect information includes: If the number of defects exceeds a preset number, the battery under test is determined to be unqualified.

12. The method according to claim 10, characterized in that, Determining the quality inspection result of the battery under test based on its defect information includes: If any of the defect sizes is larger than a preset size, the battery under test is determined to be unqualified.

13. A battery testing device, wherein the battery under test is a stacked battery, the battery under test includes a first surface, the first surface having adjacent first and second side edges, characterized in that, The device includes: An acquisition module is configured to acquire detection images of the battery under test, wherein the detection images are images of the battery under test acquired by the radiation detector during at least two relative movements between the battery under test and the radiation detector, the radiation detector including two radiation sources and two detectors, the detector including a TDI detector, wherein in one relative movement between the battery under test and the radiation detector including a first radiation source and a first detector, the first side extends along the movement direction, and in another relative movement between the battery under test and the radiation detector including a second radiation source and a second detector, the second side extends along the movement direction; The first determining module is configured to determine the defect information of the battery under test based on the detected image; The second determining module is configured to determine the quality inspection result of the battery under test based on the defect information of the battery under test.

14. A method for producing a battery, characterized in that, The method includes: The quality of the battery under test is tested using the method described in any one of claims 1 to 12, so as to determine the quality test result of the battery under test.

15. The method according to claim 14, characterized in that, The method further includes: If the quality test result of the battery under test is unqualified, the unqualified battery is discarded.

16. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory that is communicatively connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor, which, when executed, enable the at least one processor to perform the battery detection method according to any one of claims 1 to 12 or the battery production method according to claim 14 or 15.

17. A battery manufacturing apparatus, characterized in that, Including the electronic device as described in claim 16.

18. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the battery detection method according to any one of claims 1 to 12 or the battery production method according to claim 14 or 15.

19. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method for detecting the battery according to any one of claims 1 to 12 or the method for producing the battery according to claim 14 or 15.

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