Battery defect detection device, detection method and storage medium

Abstract

The present application provides a battery defect detection device, a detection method and a storage medium. The battery defect detection device comprises a ray source, a detector, a bearing part, a moving mechanism and a defect detection unit; the moving mechanism is used for adjusting, in a direction parallel to a battery bearing surface, relative positions between the bearing part and the ray source as well as between the bearing part and the detector, such that optical axes of rays emitted by the ray source vertically project to a plurality of target positions on the surface of a battery, respectively; the detector receives the rays penetrating through the battery so as to obtain a plurality of initial images; the defect detection unit is connected to the detector, and the defect detection unit is used for splicing the plurality of initial images so as to obtain a detection image comprising the whole battery, and performing defect detection on the battery on the basis of the detection image.

Description

Battery defect detection equipment, detection method and storage medium

[0001] Cross-references

[0002] This application refers to Chinese patent application No. 202310797723.8 filed on June 30, 2023, entitled “Battery Defect Detection Equipment, Detection Method and Storage Medium”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery defect detection method and detection device, equipment, medium, and product. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] Battery safety and reliability are crucial, requiring strict and comprehensive control of potential defects during production. This includes detecting internal wrinkles, folds, broken electrodes, and other defects. While battery image-based defect detection is gaining increasing popularity, its effectiveness remains limited by image quality and needs improvement.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a battery defect detection device, a detection method, an electronic device, a storage medium, and a computer program product to improve the detection effect of battery defects.

[0008] An embodiment of the first aspect of the present application provides a battery defect detection device, including: a radiation source; a detector; a carrying component, including a carrying surface for carrying a battery; a moving mechanism, used to adjust the relative position between the carrying component and the radiation source and the detector in a direction parallel to the carrying surface, so that the optical axes of the rays emitted by the radiation source are projected vertically to multiple target positions on the battery surface, and the detector receives the rays penetrating the battery to obtain multiple initial images; a defect detection unit, connected to the detector, the defect detection unit is used to splice the multiple initial images to obtain a detection image including the entire battery, and perform defect detection on the battery based on the detection image.

[0009] In the technical solution of the embodiment of the present application, the relative position between the supporting component and the radiation source and the detector is adjusted in a direction parallel to the battery supporting surface by a moving mechanism, so that the optical axis of the rays emitted by the radiation source is projected vertically onto multiple positions on the battery surface, and the images taken at multiple positions are stitched together to obtain a detection image of the entire battery, thereby reducing the influence of battery edge image distortion, realizing effective detection of battery defects, and improving the detection effect of battery defects.

[0010] In some embodiments, the detector is a flat-panel detector with high spatial resolution, which can clearly display tiny structures and changes, and is conducive to improving the accuracy of battery defects.

[0011] In some embodiments, the radiation surface of the radiation source on the plane where the support surface is located is larger than a preset value. As a result, the radiation surface of the radiation source on the plane where the battery surface is located is sufficiently large, further reducing the problem of battery edge distortion in the captured image, improving the detection effect, reducing the number of shots, and improving detection efficiency.

[0012] In some embodiments, the plurality of target positions include a first preset point on each of two opposite sides of the battery. Since the plurality of target positions include the first preset point on each of two opposite sides of the battery, the problem of battery edge distortion can be more effectively solved.

[0013] In some embodiments, the multiple target positions also include at least one second preset point on the line between two first preset points on opposite sides of the battery. By obtaining the initial image at the two first preset points and at least one second preset point, it is possible to ensure that a detection image of the entire battery is obtained, thereby enabling comprehensive defect detection of the battery and improving the accuracy of battery defect detection.

[0014] In some embodiments, the first preset point is the midpoint of each side, so that the initial image obtained is symmetrical along the midpoint, avoiding the problem of battery distortion at one end of the side, improving the efficiency of battery defect detection, and at the same time, avoiding the first preset point deviating from the midpoint, which may require multiple shots on the side to obtain a detection image including the entire battery.

[0015] In some embodiments, the detector is a time-delayed integration detector. By acquiring a test image encompassing the entire battery, the problem of battery edge image distortion can be overcome, improving the quality of the battery test image and thus enhancing the effectiveness of battery defect detection.

[0016] In some embodiments, the radiation source emits radiation that scans the battery surface in a direction parallel to a side of the battery. The multiple target locations include multiple scanning locations on the battery surface where the optical axis of the radiation source is located. Scanning the battery surface with the radiation source effectively addresses the problem of battery edge distortion, improves the quality of the obtained battery inspection image, and thus facilitates more accurate detection of battery defects and enhances the accuracy of inspection results.

[0017] In some embodiments, a moving mechanism is used to drive the support member to move in a direction parallel to the support surface to adjust the relative position of the support member, the radiation source, and the detector. By driving the support member in a direction parallel to the battery surface, the relative positions of the support member, the radiation source, and the detector are adjusted so that the optical axis of the radiation emitted by the radiation source at each target position is projected perpendicularly onto the battery surface, thereby reducing battery edge distortion and improving battery defect detection.

[0018] In some embodiments, the moving mechanism is used to drive the radiation source and the detector to move in a direction parallel to the supporting surface to adjust the relative position between the supporting component and the radiation source and the detector, so that the optical axis of the radiation emitted by the radiation source at each target position is projected vertically onto the battery surface, thereby reducing the problem of battery edge image distortion and improving the battery defect detection effect.

[0019] An embodiment of the second aspect of the present application provides a battery defect detection method, including: obtaining, through a detector, multiple initial images captured by projecting the optical axes of rays emitted by a ray source perpendicularly onto multiple target positions on the battery surface; splicing the multiple initial images to obtain a detection image including the entire battery; and performing defect detection on the battery based on the detection image.

[0020] Since the initial image is obtained by capturing the optical axis of the rays emitted by the radiation source through the detector and projecting them perpendicularly onto multiple target positions on the battery surface, the problem of distortion in the battery edge image can be reduced, thereby improving the battery defect detection effect. At the same time, by splicing multiple initial images, a detection image including the entire battery is obtained, thereby enabling defect detection of the entire battery and improving the accuracy and comprehensiveness of battery defect detection.

[0021] In some embodiments, the detector is a flat-panel detector, and the radiation surface of the radiation source on the plane where the support surface is located is larger than a preset value. This ensures that the radiation surface of the radiation source on the plane where the battery surface is located is sufficiently large, further reducing the problem of battery edge distortion in the captured image, improving detection results, and reducing the number of images, thereby improving detection efficiency.

[0022] In some embodiments, the multiple target locations include a first preset point on each of two opposing sides of the battery, and the multiple initial images include a first initial image and a second initial image. The first initial image and the second initial image are captured by: projecting the optical axis of a ray emitted by a ray source perpendicularly onto the first preset point on one of the two opposing sides, and receiving the ray that penetrates the battery from the detector to obtain the first initial image; and projecting the optical axis of a ray emitted by the ray source perpendicularly onto the first preset point on the other of the two opposing sides, and receiving the ray that penetrates the battery from the detector to obtain the second initial image. Because the multiple target locations include the first preset point on each of the two opposing sides of the battery, the problem of battery edge distortion can be more effectively addressed.

[0023] In some embodiments, the multiple target locations include at least one second preset point on a line connecting two first preset points on opposite sides of the battery, and the multiple initial images include at least one third initial image. The at least one third initial image is captured by projecting the optical axis of radiation emitted by a radiation source perpendicularly onto the at least one second preset point, and receiving radiation that has penetrated the battery from a detector to obtain the third initial image. By obtaining initial images at the two first preset points and at least one second preset point, it is possible to obtain an inspection image encompassing the entire battery, thereby enabling comprehensive defect detection of the battery and improving the accuracy of battery defect detection.

[0024] In some embodiments, the detector is a time-delayed integration detector, and the multiple initial images are captured by the following method: a radiation source emits radiation that scans the battery surface in a direction parallel to a side of the battery, and the detector receives the radiation that penetrates the battery to obtain the multiple initial images, wherein the multiple target locations include multiple scanning positions of the optical axis of the radiation source on the battery surface. Acquiring a test image encompassing the entire battery using the time-delayed integration detector can better overcome the problem of distortion in battery edge images, improve the quality of battery test images, and thus enhance the effectiveness of battery defect detection.

[0025] In some embodiments, the battery defect detection method further includes: in response to the battery detection result being unqualified, rejecting or re-inspecting the battery to improve the accuracy and efficiency of battery defect detection.

[0026] An embodiment of the third aspect of the present application provides a battery defect detection device, which includes: an acquisition module for acquiring multiple initial images captured by projecting the optical axes of rays emitted by a ray source perpendicularly onto multiple target positions on the battery surface; a stitching module for stitching the multiple initial images to obtain a detection image including the entire battery; and a detection module for performing defect detection on the battery based on the detection image.

[0027] Since the detection image is obtained by taking multiple initial images based on the optical axis of the rays emitted by the ray source and projecting them vertically onto multiple target positions on the battery surface, it can reduce the problem of distortion in the battery edge image and improve the battery defect detection effect. At the same time, by splicing multiple initial images to obtain a detection image including the entire battery, it is possible to perform defect detection on the entire battery and improve the accuracy and comprehensiveness of battery defect detection.

[0028] An embodiment of the fourth aspect of the present application provides a battery production system, comprising any of the above-mentioned battery testing devices.

[0029] An embodiment of the fifth aspect of the present application provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute any one of the above-mentioned battery defect detection methods.

[0030] An embodiment of the sixth aspect of the present application provides a computer-readable storage medium storing a computer program, which implements any of the above-mentioned battery defect detection methods when executed by a processor.

[0031] An embodiment of the seventh aspect of the present application provides a computer program product, including a computer program, which implements any of the above-mentioned battery defect detection methods when executed by a processor.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0034] FIG1 is a schematic diagram of a battery defect detection device in the related art;

[0035] FIG2 is a schematic structural diagram of a battery defect detection device according to some embodiments of the present application;

[0036] FIG3 is a front view of the battery defect detection device in FIG2 ;

[0037] FIG4 is a top view of the battery defect detection device in FIG2 ;

[0038] FIG5 is a left side view of the battery defect detection device in FIG2 ;

[0039] FIG6 is a schematic structural diagram of another battery defect detection device according to some embodiments of the present application;

[0040] FIG7 is a top view of another battery defect detection device according to some embodiments of the present application;

[0041] FIG8 is a schematic structural diagram of another battery defect detection device according to some embodiments of the present application;

[0042] FIG9 is a schematic structural diagram of another battery defect detection device according to some embodiments of the present application;

[0043] FIG10 is a schematic structural diagram of another battery defect detection device according to some embodiments of the present application;

[0044] FIG11 is a flow chart of a battery defect detection method according to some embodiments of the present application;

[0045] FIG12 is a flow chart of another battery defect detection method according to some embodiments of the present application;

[0046] FIG13 is a block diagram of the composition of a battery defect detection device according to some embodiments of the present application.

[0047] Explanation of the accompanying drawings: 1000, defect detection equipment; 100, ray source; 101, optical axis; 102, radiation cross section; 103, ray; 200, detector; 300, bearing component; 400, moving mechanism; 410, fixing frame; 420, lead screw; 430, threaded sleeve; 500, defect detection unit; 600, battery; 601, first preset point; 602, second preset point; 603, battery surface; 61, distortion area; 2000, defect detection device; 2001, acquisition module; 2002, splicing module; 2003, detection module. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0057] The safety and reliability of batteries are of paramount importance, so strict and comprehensive control of defects that may occur during the battery production process is required, including the detection of defects such as internal wrinkles, folded corners, and broken pole pieces. The method of detecting defects based on battery images is becoming increasingly widely used, but due to the impact of imaging quality, the detection effect still needs to be improved. In related technologies, X-rays can be used to obtain test images of batteries, and defect detection of batteries can be performed based on the test images, thereby detecting defects such as internal wrinkles, folded corners, and broken pole pieces that may occur during the production process.

[0058] Figure 1 is a schematic diagram of a battery defect detection device in the related art, in which radiation 103 forms a distorted region 61 at the edge of the battery. As shown in Figure 1, when the battery defect detection device in the related art performs defect detection, the radiation 103 emitted by the radiation source 100 forms a conical beam, and the detector 200 receives the radiation 103 that penetrates the battery 600 to obtain a detection image of the battery 600. However, the transmission thickness of the radiation 103 at the edge of the battery 600 is inconsistent, resulting in a distorted detection image. Battery defect detection based on the detection image will result in poor detection of battery defects within the distorted region 61, thereby affecting the accuracy of defect detection at the battery edge and making it impossible to fully guarantee the quality of the battery.

[0059] The battery defect detection equipment and detection method disclosed in the embodiments of the present application can effectively detect defects such as wrinkles, folds, and electrode breakage inside the battery, reduce the risk of battery outflow, and improve the reliability and safety of the battery.

[0060] The embodiments of the present application provide a battery defect detection device and detection method, electronic equipment, storage medium and computer program product, which can be applicable to but not limited to cylindrical batteries, soft-pack batteries, square-shell batteries, wound batteries, etc.

[0061] Figure 2 is a schematic diagram of the structure of a battery defect detection device according to some embodiments of the present application, Figure 3 is a front view of the battery defect detection device in Figure 2, Figure 4 is a top view of the battery defect detection device in Figure 2, and Figure 5 is a left side view of the battery defect detection device in Figure 2. Figure 6 is a schematic diagram of the structure of another battery defect detection device according to some embodiments of the present application, and Figure 7 is a top view of another battery defect detection device according to some embodiments of the present application.

[0062] As shown in Figures 2 to 7, an embodiment of the present application provides a battery defect detection device 1000, comprising a radiation source 100, a detector 200, a supporting component 300, a moving mechanism 400, and a defect detection unit 500. The supporting component 300 includes a supporting surface for supporting a battery 600. The moving mechanism 400 is used to adjust the relative positions of the supporting component 300, the radiation source 100, and the detector 200 in a direction parallel to the supporting surface, so that the optical axis 101 of the radiation emitted by the radiation source 100 is projected perpendicularly onto multiple target positions on the battery surface 603. The detector 200 receives radiation that penetrates the battery 600 to obtain multiple initial images. The defect detection unit 500 is connected to the detector 200 and is used to stitch the multiple initial images together to obtain a detection image including the entire battery 600, and perform defect detection on the battery 600 based on the detection image.

[0063] The battery 600 can be placed on the supporting surface of the supporting component 300. According to some embodiments of the present application, the supporting component 300 and the battery 600 can be moved in a direction parallel to the supporting surface under the drive of the moving mechanism 400. When the optical axis 101 of the ray emitted by the ray source 100 is vertically projected onto the target position of the battery surface 603, the moving mechanism 400 pauses. At this time, the ray source 100 emits ray 103 to the battery 600, and the detector 200 receives the corresponding ray that penetrates the battery 600 at the target position, and obtains the corresponding initial image of the target position. After the detector 200 completes the acquisition of the corresponding initial image of the target position, the moving mechanism 400 moves again so that the optical axis 101 of the ray emitted by the ray source 100 is vertically projected onto another target position on the surface of the battery 600. At this time, the ray source 100 emits ray 103 to the battery 600, and the detector 200 again receives the corresponding ray that penetrates the battery 600 at the other target position. According to some embodiments of the present application, the defect detection unit 500 stitches the obtained multiple initial images to obtain a detection image including the entire battery 600, and the defect detection unit 500 performs defect detection on the battery 600 based on the detection image.

[0064] Among them, the number of multiple target positions is at least 2, and the number of target positions is related to the size and model of the detector 100 and the battery 600 and the size of the radiation surface of the radiation source on the battery surface 603. For example, when the size of the battery 600 is large, or when the detection radius of the detector 100 is small, three or more shots can be taken in sequence in a direction parallel to the battery surface 603 (from one side of the battery to the other side in sequence) to obtain a detection image including the entire battery 600.

[0065] For example, the moving mechanism 400 moves the battery 600 located on the supporting component 300 so that the optical axis 101 of the radiation emitted by the radiation source 100 faces one side of the battery 600 (see FIG3 ) and is projected perpendicularly onto the battery surface 603. The detector 200 obtains an initial image of the battery 600 on that side. The moving mechanism 400 then moves the supporting component 300 in a direction parallel to the battery surface 603, driving the battery 600 located on the supporting component 300 to move so that the optical axis 101 of the radiation emitted by the radiation source 100 faces the other side of the battery 600 and is projected perpendicularly onto the battery surface 603. The detector 200 obtains another initial image of the battery 600. The defect detection unit 500 connected to the detector 200 splices the multiple initial images to obtain a detection image including the entire battery 600, and performs defect detection on the battery 600 based on the detection image. In some embodiments, when the radiation surface of the radiation source 100 on the battery surface 603 is circular, the radius of the radiation surface can be greater than half the height of the battery 600. This allows both sides of the battery 600 to be imaged, and a detection image encompassing the entire battery 600 can be obtained based on the two captured initial images. In other embodiments, when the radiation surface of the radiation source 100 on the battery surface 603 is rectangular, the length or width of the radiation surface can be greater than half the height of the battery 600. This allows both sides of the battery 600 to be imaged, and a detection image encompassing the entire battery 600 can also be obtained based on the two captured initial images. The battery height can be the distance from one side of the battery to the other opposite side of the battery. The detection size can refer to the size of the radiation surface of the radiation emitted by the radiation source 100 on the plane of the battery surface 603. It should be noted that the radiation surface of the radiation source 100 on the battery surface 603 is not limited to circular or rectangular shapes and can also be elliptical, for example.

[0066] It should be understood that, referring to FIG1 , in the battery defect detection technology of the related art, when the battery 600 is moved to the inspection station, the ray 103 is aimed at the large surface (middle position) of the battery surface 603, and the ray 103 forms a conical beam. The projection thickness of the conical beam at the edge of the battery 600 is different, resulting in distortion. In the battery defect detection device 1000 of the embodiment of the present application, driven by the moving mechanism 400, the relative positions of the supporting component 300, the ray source 100, and the detector 200 are adjusted, so that the optical axis 101 of the ray emitted by the ray source 100 is projected perpendicularly to multiple positions on the battery surface 603. The multiple initial images obtained at the multiple positions are spliced ​​to obtain a detection image including the entire battery 600, thereby reducing the risk of distortion in the battery edge image and improving the battery defect detection effect.

[0067] The relative positions of the supporting component 300, the radiation source 100 and the detector 200 are adjusted in a direction parallel to the battery supporting surface by the moving mechanism 400, so that the optical axis 101 of the radiation emitted by the radiation source 100 is projected vertically onto multiple target positions on the battery surface 603, and the detection image of the entire battery is obtained by stitching the images taken at multiple positions, thereby reducing the influence of the battery edge image distortion, realizing effective detection of battery defects, and improving the detection effect of battery defects.

[0068] According to some embodiments of the present application, the detector 200 is a flat panel detector.

[0069] The optical axis 101 of the radiation emitted by the radiation source 100 is directed toward one side of the battery 600, and the optical axis 101 is parallel to one end face of the battery 600. At this point, only half of the conical beam formed by the radiation 103 emitted by the radiation source 100 is projected onto the battery 600 on the support component 300 (see FIG4 ). The flat-panel detector receives the radiation that has penetrated the battery 600 to obtain an initial image corresponding to that side, i.e., an initial image captured by projecting the optical axis of the radiation source 100 perpendicularly onto that side. Similarly, driven by the moving mechanism 400, the optical axis 101 of the radiation emitted by the radiation source 100 is directed toward the other side of the battery 600, and the flat-panel detector receives the radiation that has penetrated the battery 600 to obtain an initial image corresponding to the other side of the battery 600. It will be understood that the radiation cross-section of the radiation beam emitted by the radiation source 100, perpendicular to the optical axis, is not limited to a circular shape; for example, it may also be rectangular, elliptical, etc.

[0070] The detector 200 can be, for example, an amorphous silicon flat-panel detector, and the radiation source 100 can be, but is not limited to, an X-ray source. The moving mechanism 400 adjusts the relative position between the supporting component 300, the X-ray source, and the flat-panel detector in a direction parallel to the battery surface 603, so that the optical axis 101 of the X-ray emitted by the X-ray source is projected vertically onto multiple target positions on the battery surface 603. The defect detection unit 500 splices multiple initial images to obtain a detection image including the entire battery 600.

[0071] It should be noted that when the defect detection unit 500 does not yet obtain a detection image that includes the entire battery 600 after splicing the two initial images, it can obtain an initial image again for the target position between the two sides of the battery 600. The order in which the initial image corresponding to one side of the battery 600, the initial image corresponding to the target position between the two sides, and the initial image corresponding to the other side of the battery 600 are acquired is not limited and should not be construed as limiting the scope of the battery defect detection device 1000 of the embodiment of the present application. In some cases, the order can be adjusted, for example, by first acquiring the initial images corresponding to the two sides of the battery 600 and then acquiring the initial image corresponding to the target position between the two sides. Alternatively, the moving mechanism 400 can be driven by a stepper motor and move at a constant speed, starting from one side of the battery 600, and sequentially acquiring the initial image corresponding to the side, the initial image corresponding to the target position between the two sides, and the initial image corresponding to the other side of the battery 600.

[0072] Flat-panel detectors have high spatial resolution and can clearly display tiny structures and changes, which helps improve the accuracy of battery defects.

[0073] As shown in FIG. 4 , according to some embodiments of the present application, the size of the radiation surface of the ray source 100 on the plane where the bearing surface is located is greater than a preset value.

[0074] The radiation cross section 102 of the radiation source 100 perpendicular to its optical axis 101 can be circular, and the radius of the radiation surface of the radiation source 100 on the plane where the battery surface 603 lies can be greater than a preset value. The radiation cross section 102 of the radiation source 100 perpendicular to its optical axis 101 can also be rectangular, and the length and / or width of the radiation surface of the radiation source 100 on the plane where the battery surface 603 lies can be greater than a preset value. In other words, the size of the radiation surface can be set based on the shape of the radiation surface.

[0075] It should be noted that, for ease of description and understanding, in the embodiments of the present application, the surface of the battery placed on the carrying surface is represented by the carrying surface of the carrying component.

[0076] It should be understood that the radiation radius of the ray source 100 on the plane where the battery surface 603 is located is greater than a preset value. For different models of batteries 600, the preset value is related to the model of the battery 600 and the number of shots, as long as it can be ensured that the multiple initial images obtained based on the shooting can be spliced ​​to obtain a detection image including the entire battery 600. For example, when the target position of the shooting only includes two opposite sides of the battery, the preset value can be set to be greater than half of the height of the battery (the distance from one of the two opposite sides to the other side) to ensure that the two initial images taken on the two opposite sides can be spliced ​​to obtain a detection image including the entire battery 600. In the embodiment of the present application, the shooting position of the ray source and the detector can refer to the optical axis of the ray source being vertically projected to the shooting position, and the detector receives the rays that penetrate the battery at this time to obtain the initial image corresponding to the shooting position.

[0077] Therefore, the radiation surface of the ray source on the plane where the battery surface 603 is located is large enough, further reducing the problem of battery edge distortion in the captured image, improving the detection effect, reducing the number of shots, and improving detection efficiency.

[0078] 4 , according to some embodiments of the present application, the plurality of target locations include a first preset point 601 on each of two opposite sides of a battery 600 .

[0079] The moving mechanism 400 adjusts the relative positions of the supporting component 300, the radiation source 100, and the detector 200 in a direction parallel to the battery supporting surface, so that the optical axes 101 of the rays emitted by the radiation source 100 are projected perpendicularly onto the battery surface 603, and the optical axes 101 of the rays emitted by the radiation source 100 are aligned with the first preset points 601 on each of the two opposite sides of the battery. The multiple initial images obtained at the first preset points 601 on the two opposite sides of the battery are spliced ​​to obtain a detection image including the entire battery 600.

[0080] The first preset point 601 may be, for example, the center point of the side of the battery 600 , or may be a 1 / 3 or 1 / 4 point.

[0081] Since the multiple target positions include the first preset points 601 on each of the two opposite sides of the battery 600 , the moving mechanism 400 moves with reference to the multiple first preset points 601 , which can more effectively solve the problem of battery edge distortion.

[0082] 7 , according to some embodiments of the present application, the plurality of target positions further include at least one second preset point 602 located on a line connecting two first preset points 601 on opposite sides of the battery 600 .

[0083] When the size of the battery 600 is large and the size of the radiation surface of the ray source 100 on the plane where the battery supporting surface is located is smaller than the preset value, the two initial images obtained at the two first preset points 601 on the opposite sides of the battery 600 (that is, the optical axis of the ray source is projected vertically on the first preset point 601 for shooting) cannot obtain a detection image including the entire battery 600 after splicing. The initial image obtained at at least one second preset point 602 is spliced ​​with the initial images of the two first preset points 601 to obtain a detection image including the entire battery 600.

[0084] For example, the number of target positions is 3, and a first preset point 601 is provided on the two opposite sides of the battery 600, and a second preset point 602 is provided on the line connecting the two first preset points 601 on the two opposite sides of the battery 600. By obtaining multiple initial images at the two first preset points 601 and one second preset point 602, a detection image including the entire battery 600 is obtained after splicing.

[0085] The second preset point 602 may be, for example but not limited to, a midpoint on the line connecting the two first preset points 601. It is understood that the second preset point 602 may not be located on the line connecting the two first preset points 601, for example, located on one side of the midpoint on the line connecting the two first preset points 601.

[0086] Since the multiple target positions also include at least one second preset point 602 on the line connecting two first preset points 601 on opposite sides of the battery 600, by obtaining an initial image at the two first preset points 601 and at least one second preset point 602, it is possible to ensure that a detection image including the entire battery 600 is obtained, thereby enabling comprehensive defect detection of the battery 600 and improving the accuracy of battery defect detection.

[0087] 4 and 7 , according to some embodiments of the present application, the first preset point 601 is the midpoint of each side.

[0088] The moving mechanism 400 adjusts the relative positions between the supporting component 300 and the radiation source 100 and the detector 200, so that the optical axes 101 of the rays emitted by the radiation source 100 are projected vertically onto the battery surface 603, and the optical axes 101 of the rays emitted by the radiation source 100 are aligned with the midpoint of each of the two opposite sides of the battery, and two initial images are obtained at the midpoint of each of the two opposite sides of the battery.

[0089] When the size of the radiation surface of the ray source 100 on the plane where the battery supporting surface is located is greater than a preset value, two initial images obtained at the midpoint of each of the two opposite sides of the battery 600 can obtain a detection image including the entire battery 600.

[0090] Alternatively, when the size of the radiation surface of the ray source 100 on the plane where the supporting surface is located is smaller than a preset value, the two initial images obtained at the midpoint on each of the two opposite sides of the battery 600 cannot be spliced ​​together to form a detection image including the entire battery 600. It is still necessary to set at least one second preset point 602 on the line connecting the two midpoints. After splicing the two initial images obtained at the midpoint on each side and the initial image obtained at at least one second preset point 602, a detection image including the entire battery 600 is obtained.

[0091] In some embodiments, the second predetermined point 602 may be located on a line connecting two midpoints.

[0092] Since the first preset point 601 is the midpoint of each side, the obtained initial image is symmetrical along the midpoint, avoiding the problem of battery distortion at one end of the side, improving the efficiency of battery defect detection, and at the same time, avoiding the first preset point deviating from the midpoint, which may require multiple shots on the side to obtain a detection image including the entire battery.

[0093] FIG8 is a schematic diagram of the structure of another battery defect detection device according to some embodiments of the present application, wherein the detector 200 is a time-delayed integration detector. As shown in FIG8 , according to some embodiments of the present application, the detector 200 is a time-delayed integration detector.

[0094] The TDI detector (Time Delay Integration) is an imaging technology similar to linear scanning. It has high detection efficiency and can also avoid image distortion caused by illumination angle to a certain extent.

[0095] According to some embodiments of the present application, when the detector 200 is a delayed integration detector, the supporting component 300 and the battery 600 can be moved in a direction parallel to the battery supporting surface under the drive of the moving mechanism 400. The optical axis 101 of the ray emitted by the ray source 100 is projected perpendicularly to the battery surface 603. The battery 600 can be moved at a constant speed under the drive of a stepper motor, for example. The optical axis of the ray source 100 is projected perpendicularly to the surface of the battery 600, and the optical axis moves from one side of the cell surface (for example, the side perpendicular to the height direction of the battery 600) to the other opposite side in a linear array scanning manner. The delayed integration detector synchronously receives the rays that penetrate the battery 600 to obtain multiple initial images. After the multiple columns of initial images are spliced, a detection image including the entire battery 600 is obtained. Among them, during the process of detection and imaging by the delayed integration detector, the battery 600 moves at a constant speed. It can be understood that the ray source and the detector can also be driven to move synchronously by the moving mechanism 400, and the surface of the battery can also be scanned to obtain multiple initial images.

[0096] By acquiring a detection image including the entire battery 600 through a delayed integration detector, the problem of battery edge image distortion can be better overcome, the quality of the battery detection image can be improved, and thus the detection effect of battery defects can be enhanced.

[0097] According to some embodiments of the present application, the rays emitted by the ray source 100 scan the battery surface 603 along a direction parallel to a side of the battery 600 , and the multiple target positions include multiple scanning positions of the optical axis 101 of the ray source 100 on the battery surface 603 .

[0098] The delayed integration detector receives the ray 103 of the radiation cross section 102 , wherein the ray emitted by the ray source 100 scans the battery surface 603 along a direction parallel to a side of the battery 600 (eg, a side parallel to the height direction of the battery 600 ).

[0099] Starting from entering the scanning area (the area where the battery is located) from one side of the battery 600 until leaving the scanning area from the other side of the battery 600, the rays emitted by the ray source 100 continuously scan multiple scanning positions (i.e., target positions) on the battery surface 603 to obtain multiple initial images corresponding to the multiple target positions, i.e., multiple initial images captured with the optical axis of the ray source perpendicular to the multiple target positions.

[0100] Scanning the battery surface with a ray source can effectively solve the problem of battery edge distortion and improve the quality of the obtained battery inspection image, thereby facilitating more accurate detection of battery defects and improving the accuracy of inspection results.

[0101] Figure 9 is a schematic diagram of another battery defect detection device according to some embodiments of the present application. As shown in Figure 9 , according to some embodiments of the present application, the moving mechanism 400 is used to drive the supporting member 300 to move in a direction parallel to the battery surface 603 to adjust the relative position between the supporting member 300, the radiation source 100, and the detector 200.

[0102] In the battery defect detection equipment 1000, the number of the supporting parts 300, the radiation source 100 and the detector 200 can be multiple. For example, a set of battery defect detection equipment 1000 is provided with two supporting parts 300, two radiation sources 100 and two detectors 200, and the supporting parts 300, the radiation source 100 and the detector 200 are arranged in groups (see Figure 9).

[0103] The moving mechanism 400 drives the supporting component 300 to move in a direction parallel to the battery surface 603, driving the battery 600 to move to multiple target positions. For example, the moving mechanism 400 is a slide rail assembly, a part of which is fixed to the supporting component 300. Under power drive, it drives the supporting component 300 to move in a direction parallel to the battery surface 603 (refer to the moving direction in the figure), driving the battery 600 to adjust the relative position between the supporting component 300 and the radiation source 100 and the detector 200 through the moving mechanism 400, so that the optical axis 101 of the radiation emitted by the radiation source 100 is projected vertically to multiple target positions on the battery surface 603.

[0104] When inspecting the battery 600, since there can be multiple supporting components 300, radiation sources 100 and detectors 200, the battery defect inspection device 1000 can inspect multiple batteries 600 located at the inspection stations at the same time, thereby improving the inspection efficiency.

[0105] For example, the moving mechanism 400 is a pull wire for battery detection. The moving direction of the pull wire is parallel to the battery surface 603. When the pull wire runs, it drives the supporting component 300 to move, and drives the battery 600 located on the supporting component 300 to move, thereby adjusting the relative position between the battery 600 on the supporting component 300 and the radiation source 100 and the detector 200, so that the optical axis of the radiation source 100 is perpendicular to multiple target positions on the surface of the battery 600 in sequence.

[0106] The supporting component 300 is driven to move in a direction parallel to the battery support by the moving mechanism 400, and the relative positions of the supporting component 300, the radiation source 100 and the detector 200 are adjusted so that the optical axis 101 of the radiation emitted by the radiation source 100 at each target position is projected vertically onto the battery surface 603, thereby reducing the problem of battery edge image distortion and improving the battery defect detection effect.

[0107] Figure 10 is a structural schematic diagram of another battery defect detection device of some embodiments of the present application. As shown in Figure 10, according to some embodiments of the present application, the moving mechanism 400 is used to drive the ray source 100 and the detector 200 to move in a direction parallel to the carrying surface to adjust the relative position between the carrying component 300 and the ray source 100 and the detector 200.

[0108] According to some embodiments of the present application, the moving mechanism 400 may include a fixing frame 410, a lead screw 420 and a threaded sleeve 430. The radiation source 100 and the detector 200 are respectively fixed on the fixing frame 410. The threaded sleeve 430 is fixed below the fixing frame 410. The lead screw 420 cooperates with the threaded sleeve 430. Under power drive, the lead screw 420 rotates to drive the threaded sleeve 430 and the fixing frame 410 to move, thereby driving the radiation source 100 and the detector 200 to move in a direction parallel to the battery surface 603 (parallel to the bearing surface).

[0109] For example, when a battery 600, located on the supporting surface of the supporting member 300, is placed in the inspection station, the lead screw 420 is driven to rotate, thereby moving the radiation source 100 and the detector 200 to the left or right in a direction parallel to the battery surface 603. Radiation scans from one side of the battery 600 surface until the radiation source 100 and the detector 200 exit from the other side of the battery 600 surface. Thus, during the scanning process, the moving mechanism 400 drives the radiation source 100 and the detector 200 to move, thereby adjusting the relative positions of the supporting member 300, the radiation source 100, and the detector 200.

[0110] Taking the detector 200 as a flat-panel detector as an example, the moving mechanism 400 drives the radiation source 100 and the detector 200 to move in sequence in a direction parallel to the battery surface 603 to multiple target positions where the radiation source is projected vertically on the battery surface 603. The detector 200 receives the radiation that penetrates the battery 600 to obtain multiple initial images. The defect detection unit 500 splices the multiple initial images to obtain a detection image including the entire battery 600.

[0111] The moving mechanism 400 is used to drive the ray source 100 and the detector 200 to move in a direction parallel to the battery surface 603 to adjust the relative position between the supporting component 300 and the ray source 100 and the detector 200, so that the optical axis 101 of the ray emitted by the ray source 100 at each target position is projected vertically onto the battery surface 603, thereby reducing the problem of battery edge image distortion and improving the battery defect detection effect.

[0112] FIG11 is a flow chart of a battery defect detection method according to some embodiments of the present application. As shown in FIG11 , an embodiment of the present application provides a battery defect detection method, including:

[0113] S100, acquiring, through a detector, multiple initial images obtained by projecting the optical axes of the rays emitted by the ray source perpendicularly onto multiple target positions on the battery surface 603;

[0114] S200, stitching multiple initial images to obtain a detection image including the entire battery; and

[0115] S300: Perform defect detection on the battery based on the detection image.

[0116] As shown in Figures 2-5, the moving mechanism 400 adjusts the relative positions between the supporting component 300 and the radiation source 100 and the detector 200 in a direction parallel to the battery surface 603. When the optical axis 101 of the ray emitted by the ray source 100 is projected vertically to the target position on the battery surface 603, the ray 103 emitted by the ray source 100 is projected vertically to the target position on the surface of the battery 600, and the detector 200 receives the ray that penetrates the battery 600 to obtain an initial image corresponding to the target position.

[0117] The stitching module 2002 stitches multiple initial images to obtain a detection image including the entire battery 600, and performs defect detection on the battery 600 based on the detection image. For example, the detection image including the entire battery 600 is identified to obtain defects such as wrinkles, folded corners, and broken poles inside the battery.

[0118] It should be noted that in the battery defect detection method of the embodiment of the present application, the optical axis 101 of the ray emitted by the ray source 100 is projected vertically onto multiple target positions on the battery surface 603, and multiple initial images corresponding to the multiple target positions are obtained. The multiple initial images are spliced ​​to obtain a detection image including the entire battery 600, thereby reducing the risk of distortion of the battery edge image and improving the battery defect detection effect.

[0119] Since the initial image is obtained by the detector 200 by projecting the optical axis 101 of the rays emitted by the ray source 100 vertically onto multiple target positions on the battery surface 603, the problem of battery edge image distortion can be reduced and the battery defect detection effect can be improved. At the same time, by splicing multiple initial images to obtain a detection image including the entire battery 600, defect detection can be performed on the entire battery 600, thereby improving the accuracy and comprehensiveness of battery defect detection.

[0120] According to some embodiments of the present application, the detector 200 is a flat-panel detector, and the size of the radiation surface of the ray source 100 on the plane where the supporting surface is located is greater than a preset value.

[0121] The radiation cross section of the radiation source 100 perpendicular to its optical axis 101 can be, for example, circular, and the radius of the radiation surface of the radiation source 100 on the plane where the battery surface 603 lies can be greater than a preset value. The radiation cross section 102 of the radiation source 100 perpendicular to its optical axis 101 can also be rectangular, and the length and / or width of the radiation surface of the radiation source 100 on the plane where the battery surface 603 lies can be greater than a preset value. In other words, the size of the radiation surface can be set based on the shape of the radiation surface. The shape of the radiation cross section of the radiation source 100 is not limited to circular or rectangular and can also be, for example, elliptical.

[0122] It should be noted that, for ease of description and understanding, in the embodiments of the present application, the surface of the battery placed on the carrying surface is represented by the carrying surface of the carrying component.

[0123] It should be understood that the radiation radius of the radiation source 100 on the plane where the battery surface 603 lies is greater than a preset value. For different models of batteries 600, the preset value is related to the model of the battery 600 and the number of images captured. As long as the multiple initial images captured can be stitched together to form an inspection image that includes the entire battery 600, this is sufficient. For example, when the target location for imaging only includes two opposing sides of the battery, the preset value can be set to be greater than half the height of the battery to ensure that the two initial images captured on the opposing sides can be stitched together to form an inspection image that includes the entire battery 600.

[0124] Since the size of the radiation surface of the ray source 100 on the plane where the bearing surface is located is larger than the preset value, the problem of battery edge distortion in the captured image is further reduced, the detection effect is improved, and the number of shots can be reduced, thereby improving detection efficiency.

[0125] FIG12 is a flow chart of another battery defect detection method according to some embodiments of the present application. As shown in FIG12 , according to some embodiments of the present application, the multiple target locations include a first preset point on each of two opposite sides of the battery, and the multiple initial images include a first initial image and a second initial image. The first initial image and the second initial image are captured by the following method:

[0126] S110, vertically projecting the optical axis of the ray emitted by the ray source onto a first preset point on one of the two opposite sides, and receiving the ray that penetrates the battery from the detector to obtain a first initial image; and

[0127] S120 , vertically projecting the optical axis of the ray emitted by the ray source onto a first preset point on the other of the two opposite sides, and receiving the ray that penetrates the battery from the detector to obtain a second initial image.

[0128] As shown in Figures 2-5, the moving mechanism 400 adjusts the relative positions between the supporting component 300 and the radiation source 100 and the detector 200 in a direction parallel to the battery surface 603, so that the optical axis 101 of the radiation emitted by the radiation source 100 is projected vertically onto multiple target positions on the battery surface 603, and the multiple target positions include the first preset point 601 on each of the two opposite sides of the battery, where the optical axis 101 of the radiation emitted by the radiation source 100 is aligned.

[0129] For example, the optical axis 101 of the radiation emitted by the radiation source 100 is perpendicularly aligned with a first predetermined point 601 on one side of the battery 600, and the radiation 103 forms a circular radiation cross section 102 at the first predetermined point 601. The detector 200 receives the radiation that has penetrated the battery 600 to obtain a first initial image. The moving mechanism 400 adjusts the relative positions of the supporting component 300, the radiation source 100, and the detector 200 so that the optical axis 101 of the radiation emitted by the radiation source 100 is perpendicularly projected onto the first predetermined point 601 on the other of the two opposite sides, and the detector 200 receives the radiation that has penetrated the battery 600 to obtain a second initial image.

[0130] Since the multiple target positions include the first preset point 601 on each of two opposite sides of the battery 600 , the problem of battery edge distortion can be solved more effectively.

[0131] According to some embodiments of the present application, the multiple target locations include at least one second preset point 602 located on a line connecting two first preset points 601 on opposite sides of a battery 600, and the multiple initial images include at least one third initial image, which is captured by the following method:

[0132] The optical axis 101 of the ray emitted by the ray source 100 is vertically projected onto at least one second preset point, and the detector 200 receives the ray that penetrates the battery 600 to obtain a third initial image.

[0133] For example, when the battery size is large and the radiation radius of the ray source 100 on the plane where the battery surface 603 is located is smaller than the preset value, the optical axis of the ray source is perpendicular to the two first preset points 601 projected onto the opposite sides of the battery 600. The two initial images obtained after stitching cannot obtain a detection image including the entire battery 600. Therefore, at least one second preset point 602 can be added to the middle area of ​​the battery surface 603 to obtain a corresponding third initial image at the at least one second preset point 602, so that the detection image including the entire battery 600 can be obtained after stitching the multiple initial images obtained.

[0134] In some embodiments, the optical axis 101 of the ray emitted by the ray source 100 is projected vertically onto at least one second preset point 602, and the detector 200 receives the ray that penetrates the battery 600 to obtain a third initial image. The multiple initial images taken at multiple first preset points 601 and second preset points 602 are spliced ​​to obtain a detection image including the entire battery 600.

[0135] By obtaining an initial image at two first preset points 601 and at least one second preset point 602, it is possible to ensure that a detection image of the entire battery 600 is obtained, thereby enabling comprehensive defect detection of the battery 600 and improving the accuracy of battery defect detection.

[0136] According to some embodiments of the present application, the detector 200 is a time-delayed integration detector, and the multiple initial images are captured by the following method:

[0137] The rays emitted by the ray source 100 scan the battery surface 603 along a direction parallel to a side edge of the battery 600, and the detector 200 receives the rays penetrating the battery 600 to obtain multiple initial images, wherein the multiple target positions include multiple scanning positions of the optical axis 101 of the ray source 100 on the battery surface 603.

[0138] According to some embodiments of the present application, when the detector 200 is a delayed integration detector, the supporting component 300 and the battery 600 can be moved in a direction parallel to the battery supporting surface under the drive of the moving mechanism 400. The optical axis 101 of the ray emitted by the ray source 100 is projected perpendicularly to the battery surface 603. The battery 600 can be moved at a constant speed under the drive of a stepper motor, for example. The optical axis of the ray source 100 is projected perpendicularly to the surface of the battery 600, and the optical axis moves from one side of the cell surface (for example, the side perpendicular to the height direction of the battery 600) to the other opposite side in a linear array scanning manner. The delayed integration detector synchronously receives the rays that penetrate the battery 600 to obtain multiple initial images. After the multiple columns of initial images are spliced, a detection image including the entire battery 600 is obtained. Among them, during the process of detection and imaging by the delayed integration detector, the battery 600 moves at a constant speed. It can be understood that the ray source and the detector can also be driven to move synchronously by the moving mechanism 400, and the surface of the battery can also be scanned to obtain multiple initial images.

[0139] By acquiring a detection image including the entire battery through a delayed integration detector, the problem of distortion in the battery edge image can be better overcome, the quality of the battery detection image can be improved, and thus the detection effect of battery defects can be enhanced.

[0140] According to some embodiments of the present application, the battery defect detection method further includes:

[0141] In response to the test result of the battery being unqualified, the battery is rejected or retested.

[0142] During the battery defect detection process, improper operation or accidental equipment failure may affect the accuracy of the test results. In this case, the batteries with unqualified test results can be re-inspected to reduce the risk of misjudgment due to accidental factors (equipment failure, improper operation).

[0143] Alternatively, the batteries 600 with unqualified test results may be discarded to improve the reliability and test efficiency of the batteries 600 .

[0144] By rejecting or re-inspecting batteries 600 with unqualified test results, the accuracy of battery defect detection is improved.

[0145] Figure 13 is a block diagram of the composition of a battery defect detection device in some embodiments of the present application. As shown in Figure 13, an embodiment of the present application provides a battery defect detection device 2000, and the battery defect detection device 2000 includes an acquisition module 2001, a splicing module 2002 and a detection module 2003, wherein the acquisition module 2001 is used to acquire multiple initial images captured by projecting the optical axes of the rays emitted by the ray source perpendicularly onto multiple target positions on the battery surface 603, the splicing module 2002 is used to splice the multiple initial images to obtain a detection image including the entire battery, and the detection module 2003 is used to perform defect detection on the battery based on the detection image.

[0146] As shown in Figures 2-5 , when the optical axis 101 of the ray emitted by the ray source 100 is projected perpendicularly onto the target position on the battery surface 603, the ray source 100 emits the ray 103 and projects it onto the battery 600. The detector 200 receives the ray that has penetrated the battery 600. The acquisition module 2001 acquires multiple initial images captured by the optical axis 101 of the ray emitted by the ray source 100 being projected perpendicularly onto multiple target positions on the battery surface 603. The stitching module 2002 stitches the multiple initial images to obtain a detection image including the entire battery 600. The detection module 2003 is used to perform defect detection on the battery 600 based on the detection image. For example, the detection module 2003 identifies defects in the detection image including the entire battery 600, thereby detecting defects such as wrinkles, folded corners, and broken pole pieces within the battery.

[0147] Since the detection image is obtained by taking multiple initial images based on the optical axis of the rays emitted by the ray source and projecting them vertically onto multiple target positions on the battery surface, it can reduce the problem of distortion in the battery edge image and improve the battery defect detection effect. At the same time, by splicing multiple initial images to obtain a detection image including the entire battery, it is possible to perform defect detection on the entire battery and improve the accuracy and comprehensiveness of battery defect detection.

[0148] Some embodiments of the present application provide a battery production system, including the battery testing equipment in the above embodiments. It is understood that in addition to the battery testing equipment, the battery production system may also include winding equipment, liquid injection equipment, formation equipment, etc.

[0149] Some embodiments of the present application provide an electronic device, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery defect detection method of the above-mentioned embodiment.

[0150] Some embodiments of the present application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery defect detection method in the above-mentioned embodiment.

[0151] Some embodiments of the present application provide a computer program product, including a computer program, which implements the battery defect detection method in the above embodiment when executed by a processor.

[0152] In order to better understand the battery defect detection method and the detection device 1000 according to the embodiment of the present application, the detector 200 is specifically described below as a flat panel detector and a TDI detector.

[0153] (i) When the detector 200 is a flat-panel detector, as shown in FIG2 , the optical axis of the radiation source 100 is aligned with the midpoint of one side of the battery 600 to take the first picture. For example, the radiation source 10 and the detector 200 are moved along the height direction of the battery by a moving mechanism, or the supporting member 300 is moved along the height direction of the battery by a moving mechanism to drive the battery 600 to move, so that the optical axis 101 of the radiation emitted by the radiation source 100 can be vertically projected onto the target position on the battery surface 603.

[0154] Thereafter, the optical axis of the radiation source 100 is aligned with the midpoint of the other side opposite to the battery 600 to take a second picture. For example, after the first picture is completed, the mobile radiation source 10 and the detector are driven to move again along the height direction of the battery by the moving mechanism, or the supporting component 300 is driven to move along the height direction of the battery by the moving mechanism to drive the battery 600 to move, so that the optical axis of the radiation source 100 is aligned with the midpoint of the other side of the battery to take a second picture.

[0155] By configuring the radiation source 100 so that the radius of the radiation surface on the plane where the battery surface 603 is located is greater than half the battery height, the inspection image formed by stitching the initial images of the two shots can include the entire battery, thereby performing defect detection on the entire battery.

[0156] After completing two photos, the algorithm is used to identify whether the images have defects such as wrinkles, folds, or damage on the electrode. After the identification is completed, the result images are displayed separately or the repeated parts of the images are cropped and merged for display. Alternatively, the original images are cropped and spliced ​​before the algorithm identification is performed again, and then the result images are displayed. For example, the initial image of the first photo and the image of the second photo are first spliced ​​together, and the algorithm identification is performed on the spliced ​​image to detect battery defects. Alternatively, the algorithm identification is performed on the initial image of the first photo and the image of the second photo respectively to detect battery defects. After the detection is completed, the initial images are spliced ​​together to form a detection image, and the detection results are output.

[0157] It should be noted that, during the first and second photographs, the optical axes 101 of the rays emitted by the ray source 100 are respectively projected perpendicularly onto multiple target positions on the battery surface, thereby reducing the risk of battery edge distortion.

[0158] (ii) When the detector 200 is a TDI detector, as shown in FIG8 , the optical axis of the radiation source 100 is always perpendicular to the surface of the battery 600 for line scanning. During the line scanning process, multiple initial images are obtained by the TDI detector to reduce the problem of distortion of the battery edge image.

[0159] The battery's movement direction can be parallel to the battery's height direction. The moving mechanism drives the carrier to move linearly and at a uniform speed along the battery's height direction, thereby driving the battery 600 to move synchronously. When the battery 600 passes through the detection area of ​​the TDI detector, the TDI detector begins detection until the entire battery completely leaves the detection area.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery defect detection device, comprising: Radiation source; detector; A bearing component, including a bearing surface for bearing a battery; A moving mechanism, used for adjusting the relative positions between the bearing component, the radiation source and the detector in a direction parallel to the bearing surface, so that the optical axes of the radiation emitted by the radiation source are respectively projected vertically onto a plurality of target positions on the battery surface, and the detector receives the radiation penetrating the battery to obtain a plurality of initial images; A defect detection unit is connected to the detector, and is used for splicing the multiple initial images to obtain a detection image including the entire battery, and performing defect detection on the battery based on the detection image.

2. The battery defect detection device according to claim 1, wherein: The detector is a flat panel detector.

3. The battery defect detection device according to claim 2, wherein: The size of the radiation surface of the ray source on the plane where the bearing surface is located is greater than a preset value.

4. The battery defect detection device according to claim 2 or 3, wherein: The plurality of target locations include a first preset point on each of two opposite sides of the battery.

5. The battery defect detection device according to claim 4, wherein: The plurality of target positions further include at least one second preset point located on a line connecting two of the first preset points on two opposite sides of the battery.

6. The battery defect detection device according to claim 4, wherein: The first preset point is the midpoint of each side.

7. The battery defect detection device according to claim 1, wherein: The detector is a time-delay integration detector.

8. The battery defect detection device according to claim 7, wherein: The radiation source emits radiation that scans the battery surface along a direction parallel to a certain side of the battery, and the multiple target positions include multiple scanning positions of the optical axis of the radiation source on the battery surface.

9. The battery defect detection device according to any one of claims 1 to 8, wherein: The moving mechanism is used to drive the bearing component to move in a direction parallel to the bearing surface, so as to adjust the relative position between the bearing component, the radiation source and the detector.

10. The battery defect detection device according to any one of claims 1 to 8, wherein: The moving mechanism is used to drive the ray source and the detector to move in a direction parallel to the bearing surface, so as to adjust the relative positions between the bearing component and the ray source and the detector.

11. A battery defect detection method, comprising: Acquiring, through a detector, a plurality of initial images obtained by projecting the optical axes of the rays emitted by the ray source perpendicularly onto a plurality of target positions on the surface of the battery; splicing the multiple initial images to obtain a detection image including the entire battery; as well as Defect detection is performed on the battery based on the detection image.

12. The battery defect detection method according to claim 11, wherein: The detector is a flat panel detector, and the size of the radiation surface of the ray source on the plane where the bearing surface is located is greater than a preset value.

13. The battery defect detection method according to claim 12, wherein: The multiple target positions include a first preset point on each of two opposite sides of the battery, the multiple initial images include a first initial image and a second initial image, and the first initial image and the second initial image are obtained by taking the following method: The optical axis of the ray emitted by the ray source is vertically projected onto the first preset point on one of the two opposite sides, and the detector receives the ray penetrating the battery to obtain the first initial image; as well as The optical axis of the ray emitted by the ray source is vertically projected onto the first preset point on the other side of the two opposite sides, and the detector receives the ray penetrating the battery to obtain the second initial image.

14. The battery defect detection method according to claim 13, wherein: The multiple target positions include at least one second preset point on a line between two first preset points on two opposite sides of the battery, and the multiple initial images include at least one third initial image, which is captured by the following method: The optical axis of the ray emitted by the ray source is vertically projected onto at least one of the second preset points, and the detector receives the ray that penetrates the battery to obtain the third initial image.

15. The battery defect detection method according to claim 11, wherein: The detector is a time-delay integration detector, and the multiple initial images are obtained by taking the following methods: The radiation source emits radiation that scans the battery surface in a direction parallel to a side of the battery, and the detector receives radiation that penetrates the battery to obtain the multiple initial images, wherein the multiple target positions include multiple scanning positions of the optical axis of the radiation source on the battery surface.

16. The defect detection method according to any one of claims 11 to 15, wherein: The battery defect detection method further includes: In response to the test result of the battery being unqualified, the battery is rejected or re-tested.

17. A battery defect detection device, the device comprising: An acquisition module, used for acquiring a plurality of initial images captured by projecting the optical axes of the rays emitted by the ray source perpendicularly onto a plurality of target positions on the surface of the battery; A stitching module, used for stitching the multiple initial images to obtain a detection image including the entire battery; A detection module is used to perform defect detection on the battery based on the detection image.

18. A battery production system, comprising the battery testing device according to any one of claims 1 to 10.

19. An electronic device, comprising: at least one processor; as well as a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery defect detection method described in any one of claims 11 to 16.

20. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the battery defect detection method according to any one of claims 11 to 16.

21. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the battery defect detection method according to any one of claims 11 to 16 is implemented.

Images