Battery monomer tab detection device and battery monomer production equipment

Abstract

The invention provides a battery monomer tab detection device and battery monomer production equipment, and belongs to the technical field of batteries. The detection device comprises an X-ray source, a flat panel detector, a bearing platform and a controller. The flat panel detector is opposite to an exit port of the X-ray source, the bearing platform is located between the X-ray source and the flat panel detector, and the controller is in electric connection and / or communication connection with the flat panel detector. The controller is configured to acquire a detection image of a tab of the battery cell. Wherein the detection image is a detection image, which is obtained by the flat panel detector on the basis of the received rays, of the tabs by projecting rays emitted by the X-ray source to the flat panel detector through the tabs of the single batteries placed on the bearing platform. And determining defect information of the tab based on the detection image. According to the detection device provided by the embodiment of the invention, comprehensive detection on the tab can be realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell tab detection device and a battery cell production device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery cell technology is an important factor in their development.

[0003] Tabs are metal conductors that lead the positive and negative electrodes from the battery cells. During the production of battery cells, due to process errors, the tabs may have defects such as folding and breaking, affecting the reliability of the battery cells. In related technologies, it is impossible to detect the tabs of battery cells and identify the defects of the tabs, which affects the reliability of the battery cells. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one object of the present application is to provide a battery cell tab detection device and a battery cell production device to detect the tab of the battery cell.

[0005] The embodiment of the first aspect of the present application provides a detection device for a battery cell tab. The device comprises: an X-ray source; a flat panel detector, which is opposite to the emission port of the X-ray source; a carrier platform, which is located between the X-ray source and the flat panel detector; and a controller, which is electrically and / or communicatively connected to the flat panel detector; wherein the controller is configured to: obtain a detection image of the tab of the battery cell, the detection image being a detection image of the tab obtained by the flat panel detector based on the rays received when the rays emitted by the X-ray source pass through the tab of the battery cell placed on the carrier platform and projected onto the flat panel detector; and determine defect information of the tab based on the detection image.

[0006] In the technical solution of the embodiment of the present application, the tabs of the battery cell can be detected by an X-ray source, a flat panel detector and a carrying platform, and the detection image of the tabs can be analyzed by a controller to obtain the defect information of the tabs, thereby completing the detection of the tabs. The detection device provided in the embodiment of the present application can realize the detection of the tabs, and at the same time, the X-ray source and the flat panel detector cooperate to have a high detection coverage rate for the process defects of the tabs of the battery cell, and can observe defects that cannot be reliably detected by other testing methods, thereby realizing comprehensive detection of the tabs.

[0007] In some embodiments, the controller is also electrically and / or communicatively connected to the X-ray source, and the controller is also electrically and / or communicatively connected to the carrying platform, the pole ear includes a first pole ear and a second pole ear, and the first pole ear and the second pole ear are arranged along a first direction; wherein, obtaining a detection image of the pole ear of the battery cell includes configuring the controller to: control the movement of the carrying platform so that the first pole ear is located between the X-ray source and the flat-panel detector; control the X-ray source to emit rays through the first pole ear and project them onto the flat-panel detector; determine a first detection image of the first pole ear based on the rays received by the flat-panel detector; control the carrying platform to move along the first direction so that the second pole ear is located between the X-ray source and the flat-panel detector; control the X-ray source to emit rays through the second pole ear and project them onto the flat-panel detector; determine a second detection image of the second pole ear based on the rays received by the flat-panel detector; determine the detection image of the pole ear based on the first detection image and the second detection image. The two tabs (the first tab and the second tab) of the battery cell are inspected separately. On the one hand, when the image is subsequently inspected, less information needs to be processed for each inspection, which is faster. On the other hand, the distance between the X-ray source and the boundary of the tabs in the two inspections will be smaller, which can reduce the influence of edge distortion on the inspection results to a certain extent.

[0008] In some embodiments, determining the first detection image of the first pole lug based on the rays received by the flat-panel detector includes configuring the controller to: collect multiple original images including the first pole lug based on the rays received by the flat-panel detector; and process the multiple original images to obtain the first detection image of the first pole lug. If only one original image is collected, if this image has an error, the first detection image processed subsequently will also have an error, affecting the accuracy of the detection. In an embodiment of the present application, multiple original images are collected and processed. If one of the original images has an error, the other original images are still correct, and the impact of the error on the detection result can also be reduced.

[0009] In some embodiments, processing multiple original images to obtain a first detection image of the first pole lug includes configuring a controller to: perform noise reduction processing on the multiple original images to obtain a first image; intercept an area including the first pole lug in the first image to obtain a second image; and perform image enhancement processing on the second image to obtain a first detection image of the first pole lug. Through the processing of the above steps, the first pole lug in the first detection image can be made clearer, the defective area can be more prominent, and the defect in the first pole lug can be more easily identified.

[0010] In some embodiments, the size of the first pole lug is stored in the controller, and the area including the first pole lug in the first image is intercepted to obtain the second image, including configuring the controller to: identify the position of the first pole lug in the first image based on the grayscale value in the first image; intercept the area including the first pole lug in the first image based on the position of the first pole lug and the size of the first pole lug to obtain the second image. According to the position of the first pole lug and the size of the first pole lug, the area including the first pole lug in the first image is intercepted, so that the second image can include the first pole lug, while at the same time, to a certain extent, avoiding the second image being too large and including too many other areas, which affects the first pole lug defect detection.

[0011] In some embodiments, a defect detection model is stored in the controller, and the defect information of the tab is determined based on the detection image, including configuring the controller to: input the detection image into the defect detection model to obtain the defect information of the tab output by the defect detection model. The defect detection model stores a variety of defect types, and after the detection image is input into the defect detection model, the defect information of the tab in the detection image can be quickly identified according to the stored defect types.

[0012] In some embodiments, the training process of the defect detection model includes: obtaining a sample detection image including the tab of a sample battery cell taken under the irradiation of an X-ray source; marking the real defect information in the sample detection image; inputting the sample detection image into the defect detection model at the same time to obtain the predicted defect information of the sample battery cell output by the defect detection model; calculating the loss value based on the real defect information and the predicted defect information; and adjusting the parameters of the defect detection model based on the loss value. Before the detection, the defect samples of various sizes and types to be detected can be defined according to the detection requirements to make a sample battery cell, and the real defect information in the sample battery cell can be marked at the same time. Then, the sample battery cell is detected, and the predicted defect information of the sample battery cell output by the defect detection model is compared with the real defect information, and the parameters of the defect detection model are continuously improved to make the defect detection more accurate.

[0013] In some embodiments, the defect information includes tab folding and / or tab breakage. Tab folding and tab breakage are both tab defects. By setting tab folding and / or tab breakage as defect information, the tab defect detection can be realized.

[0014] In some embodiments, the X-ray source includes an integrated X-ray source. The integrated X-ray source has a low rework rate, high stability, small size, and simple later maintenance. The X-ray source is set as an integrated X-ray source to improve the reliability of the detection device.

[0015] In some embodiments, the distance L1 between the X-ray source and the carrying platform and the distance L2 between the flat panel detector and the carrying platform satisfy: L2>L1, so that the magnification during detection is greater than 2, making it easier to observe the tab defect from the detection image.

[0016] In some embodiments, the distance L1 between the X-ray source and the carrying platform, and the distance L2 between the flat panel detector and the carrying platform satisfy: According to the principle of similar triangles, the magnification of the detection device If the magnification factor N is too small, the magnification effect cannot be achieved well. If the magnification factor N is too large, the detection image may not be clear enough, affecting the detection effect. Limiting the magnification factor within the above range can enable the detection image to be magnified while avoiding affecting the detection effect to a certain extent.

[0017] In some embodiments, the distance L1 between the X-ray source and the carrying platform satisfies: 30mm≤L1≤50mm. If the distance L1 between the X-ray source and the carrying platform is too small, the radiation surface formed by the X-rays on the carrying surface of the carrying platform will be smaller, and part of the tab of the battery cell may not be irradiated by the X-rays, resulting in missed detection; if the distance L1 between the X-ray source and the carrying platform is too large, the size of the entire detection device will be larger. Limiting the distance L1 between the X-ray source and the carrying platform to 30mm≤L1≤50mm can avoid missed detection to a certain extent, and can also avoid the entire detection device being too large to a certain extent.

[0018] In some embodiments, the distance L2 between the flat panel detector and the carrying platform satisfies: 50mm≤L2≤200mm. If the distance L2 between the flat panel detector and the carrying platform is too small, the magnification will be too small, and the effect of magnifying the detection image cannot be well achieved. If the distance L2 between the flat panel detector and the carrying platform is too large, the size of the entire detection device will be large. Limiting the distance L2 between the flat panel detector and the carrying platform to 50mm≤L2≤200mm can both increase the magnification to a certain extent and avoid the entire detection device from being too large to a certain extent.

[0019] In some embodiments, the voltage U of the X-ray source satisfies: 70KV≤U≤90KV, and / or the current I of the X-ray source satisfies: 80μA≤I≤120μA. This allows the X-rays emitted by the X-ray source to penetrate the tabs for detection without overexposure, which would affect the accuracy of the detection.

[0020] In some embodiments, the frame rate F of the flat panel detector satisfies: 5fps≤F≤20fps. This allows the flat panel detector to capture multiple original images at one time, which reduces the impact of accidental errors on the detection results and, to a certain extent, avoids capturing too many original images at one time, which would take a long time for subsequent image processing.

[0021] An embodiment of the second aspect of the present application provides a battery monomer production device, which includes the detection device of any one of the above embodiments.

[0022] 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

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0024] Figure 1 This is a schematic diagram of the structure of a detection device according to some embodiments of the present application;

[0025] Figure 2 A block diagram of a detection device according to some embodiments of the present application;

[0026] Figure 3 A control flow chart of a controller in some embodiments of the present application;

[0027] Figure 4 A control flow chart of a controller in some embodiments of the present application;

[0028] Figure 5 A control flow chart of a controller in some embodiments of the present application;

[0029] Figure 6 A control flow chart of a controller in some embodiments of the present application;

[0030] Figure 7 A control flow chart of a controller in some embodiments of the present application;

[0031] Figure 8 A control flow chart of a controller in some embodiments of the present application;

[0032] Fig. 9 This is a front view of the detection device of some embodiments of the present application.

[0033] Description of reference numerals:

[0034] 100, X-ray source; 200, flat panel detector; 300, carrying platform; 400, controller; 500, battery cell; 501, pole ear; 5011, first pole ear; 5012, second pole ear. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] 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).

[0041] 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, which 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, and therefore should not be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0044] During the production and use of battery cells, defects may occur in the battery cells. For example, during the production of battery cells, defects such as tab folding or tab breakage may occur. It is necessary to remove the defective battery cells to avoid affecting the reliability of the battery cells to a certain extent. However, these defects cannot be observed from the outside of the battery cells, and the inside of the battery cells must be inspected. In the related art, the tabs of the battery cells cannot be inspected, which affects the reliability of the battery cells.

[0045] The embodiment of the present application provides a detection device for a battery cell tab, comprising: an X-ray source, a flat-panel detector, a carrying platform and a controller, wherein the flat-panel detector is opposite to the exit port of the X-ray source, the carrying platform is located between the X-ray source and the flat-panel detector, and the controller is electrically and / or communicatively connected to the flat-panel detector. The controller is configured to: obtain a detection image of the tab of the battery cell, the detection image being the radiation emitted by the X-ray source projected onto the flat-panel detector through the tab of the battery cell placed on the carrying platform, the flat-panel detector obtaining the detection image of the tab based on the received radiation; and determine the defect information of the tab based on the detection image. The tab of the battery cell is detected by the X-ray source and the flat-panel detector to obtain a detection image, and then the defects of the tab of the battery cell are identified by the detection image, thereby realizing the detection of the tab of the battery cell.

[0046] The battery cell tab detection device disclosed in the embodiment of the present application can detect the battery cells that have just been produced, and determine whether the battery cells are qualified based on the detection results, so as to eliminate unqualified battery cells, which can improve the reliability of the battery cells to a certain extent. At the same time, it can also detect the battery cells that have been used for a period of time to detect the reliability of the battery cells.

[0047] The present application provides a battery cell terminal lug detection device. Figure 1 Schematic diagram of the structure of the detection device of some embodiments of the present application. Figure 1 The detection device includes an X-ray source 100, a flat panel detector 200 and a carrying platform 300. The flat panel detector 200 is opposite to the exit port of the X-ray source 100, and the carrying platform 300 is located between the X-ray source 100 and the flat panel detector 200. The figure also shows a battery cell 500.

[0048] Figure 2 This is a block diagram of a detection device according to some embodiments of the present application. Figure 2 The detection device also includes a controller 400 , which is electrically and / or communicatively connected to the flat panel detector 200 .

[0049] Figure 3 This is a control flow chart of the controller of some embodiments of the present application. Figure 3 , the controller 400 is configured as:

[0050] Step S10: Acquire a detection image of the tab of the battery cell.

[0051] The detection image is the radiation emitted by the X-ray source 100 projected onto the flat panel detector 200 through the tab 501 of the battery cell 500 placed on the carrying platform 300 , and the flat panel detector 200 acquires the detection image of the tab 501 based on the received radiation.

[0052] Step S20: Determine defect information of the tab based on the detection image.

[0053] In an embodiment of the present application, the battery cell 500 can be a laminated battery cell or a wound battery cell. The shape of the battery cell is similar to a rectangular parallelepiped, and the battery cell 500 has two large faces arranged opposite to each other, and four side faces connecting the two large faces. In one implementation of the present application, one of the large faces of the battery cell 500 is placed on the bearing surface of the bearing platform 300, that is, the thickness direction Z of the battery cell 500 is perpendicular to the bearing surface of the bearing platform 300.

[0054] Exemplarily, when using the detection device to detect the battery cell 500, the battery cell 500 can be placed on the carrying platform 300 so that the large surface of the battery cell 500 is in contact with the carrying surface of the carrying platform 300, that is, the thickness direction Z of the battery cell 500 is perpendicular to the carrying surface, and then the X-ray source 100 is used to project X-rays to the pole ear 501 of the battery cell 500 and project them to the flat-panel detector 200. The flat-panel detector 200 obtains a detection image of the pole ear 501 based on the received rays.

[0055] The rays emitted by the X-ray source 100 have good transmittance, so thick battery cells can be inspected. At the same time, the X-ray inspection technology has a high coverage rate for process defects of battery cell tabs, and can observe defects that other testing methods cannot reliably detect.

[0056] The flat panel detector 200 can convert the radiation emitted by the X-ray source 100 into an electrical signal. The flat panel detector 200 can increase the image readout speed, reduce the exposure time, and thus improve efficiency.

[0057] The X-rays emitted by the X-ray source 100 are all penetrating, and the attenuation degree of the X-rays is different in materials of different thicknesses, so that the amount of X-rays detected by the flat panel detector 200 is different. There is a layer of X-ray luminescent material inside the flat panel detector 200, which can emit visible light signals under the excitation of X-rays. The visible light signals are transmitted to the photoelectric converter to form electrical signals, and then the digital signals are output through the internal electrical signal transmission circuit to represent the image formed by the light and dark contrast on the image. After the X-rays pass through the detected object, there will be a certain attenuation. The more X-rays that pass through, the more luminescent signals of the photosensitive material will be generated, and the brighter the area will be on the final image. On the contrary, the fewer X-rays that pass through, the darker the area will be on the image.

[0058] In an embodiment of the present application, the tab 501 of the battery cell 500 can be located between the flat-panel detector 200 and the X-ray source 100 by controlling the movement of the flat-panel detector 200 and the X-ray source 100, or by controlling the movement of the carrying platform 300, or by controlling the movement of the flat-panel detector 200 and the X-ray source 100 as well as the movement of the carrying platform 300 at the same time, so that during detection, the rays emitted by the X-ray source 100 can pass through the tab 501 and be projected onto the flat-panel detector 200.

[0059] In an embodiment of the present application, the X-ray source 100 may be mounted on a mobile platform, which may be movable in three mutually perpendicular directions. The movement of the X-ray source 100 may be achieved by controlling the movement of the mobile platform.

[0060] Similarly, the flat panel detector 200 and the carrying platform 300 may also be installed in the same manner as the X-ray source 100 to achieve movement of the flat panel detector 200 and the carrying platform 300 .

[0061] In other implementations of the present application, the carrying platform 300 may be a conveyor belt, or the carrying platform 300 may be a circular guide rail, etc., to achieve the mobility of the carrying platform 300.

[0062] In the embodiment of the present application, the controller 400 is electrically connected and / or communicatively connected to the flat panel detector 200 , so that the controller 400 can receive the detection image of the tab 501 .

[0063] In the embodiment of the present application, the load-bearing capacity of the carrying platform 300 is greater than the weight of the placed battery cells 500 .

[0064] In some embodiments of the present application, the controller 400 is electrically connected to the flat panel detector 200. In other embodiments of the present application, the controller 400 is communicatively connected to the flat panel detector 200; or the controller 400 is both communicatively connected and electrically connected to the flat panel detector 200.

[0065] In the embodiment of the present application, the defect information of the tab 501 includes morphological defects such as folding and breaking of the tab 501 .

[0066] In the embodiment of the present application, the defect information of the tab 501 can be used to indicate whether the battery cell 500 is qualified.

[0067] In the embodiment of the present application, if the tab 501 is folded or broken, a grayscale change will appear in the detection image, and the defect information of the tab 501 can be determined based on the grayscale change in the detection image.

[0068] The controller 400 may include a memory and a processor, the memory is used to store instructions, and the processor is used to read the instructions and execute commands according to the instructions.

[0069] In an embodiment of the present application, the flat panel detector 200 can be calibrated before the detection starts to reduce the error of the detected image. For example, the flat panel detector 200 needs to be calibrated before formal operation. Before calibration, it is necessary to ensure that there is no debris on the exit port of the X-ray source 100 and the surface of the flat panel detector 200, and there is no obstruction between the X-ray source 100 and the flat panel detector 200. It is required that the rays fully cover the receiving surface of the flat panel detector 200. The grayscale value of the imaging of the detection device at this time can be adjusted to the calibration grayscale value.

[0070] The detection device provided in the embodiment of the present application can detect the tabs of the battery cell through the X-ray source 100, the flat panel detector 200 and the carrying platform 300, and analyze the detection image of the tab 501 through the controller 400 to obtain the defect information of the tab 501, and complete the detection of the tab 501. The detection device provided in the embodiment of the present application can realize the detection of the tab 501, and at the same time, the X-ray source 100 and the flat panel detector 200 cooperate to have a high detection coverage rate for the process defects of the tab 501 of the battery cell, and can observe defects that cannot be reliably detected by other testing means, thereby realizing comprehensive detection of the tab 501.

[0071] According to some embodiments of the present application, see Figure 2 The controller 400 is also electrically connected and / or communicatively connected to the X-ray source 100, and the controller 400 is also electrically connected and / or communicatively connected to the carrier platform 300. Figure 1 The electrode tab 501 includes a first electrode tab 5011 and a second electrode tab 5012 , and the first electrode tab 5011 and the second electrode tab 5012 are arranged along a first direction Y.

[0072] Figure 4 This is a control flow chart of the controller of some embodiments of the present application. Figure 4 , step S10 includes configuring the controller 400 to:

[0073] Step S11: Control the carrying platform to move so that the first electrode ear is located between the X-ray source and the flat panel detector.

[0074] Step S12: Control the X-ray source to emit rays that pass through the first pole ear and project onto the flat panel detector.

[0075] Step S13: determining a first detection image of the first pole lug based on the rays received by the flat panel detector.

[0076] Step S14: controlling the carrying platform to move along the first direction so that the second electrode ear is located between the X-ray source and the flat panel detector.

[0077] Step S15: Control the X-ray source to emit rays that pass through the second electrode ear and project onto the flat panel detector.

[0078] Step S16: determining a second detection image of the second pole lug based on the rays received by the flat panel detector.

[0079] Step S17: Determine the detection image of the tab based on the first detection image and the second detection image.

[0080] In the embodiment of the present application, the movement of the battery cell 500 is controlled by controlling the movement of the carrying platform 300. The battery cell 500 is relatively small in size, and controlling the movement of the battery cell 500 is more convenient than controlling the movement of the X-ray source 100 and the flat panel detector 200.

[0081] In an embodiment of the present application, the carrying platform 300 is movable, and the moving trajectory of the carrying platform 300 passes between the X-ray source 100 and the flat panel detector 200. After the detection of a current battery cell is completed, the carrying platform 300 can be moved so that the detection device can detect another battery cell, that is, continuous detection of battery cells can be achieved, thereby improving detection efficiency.

[0082] In the embodiment of the present application, the position of the battery cell 500 can be adjusted by moving the position of the carrying platform 300 , so that the tab 501 of the battery cell 500 can be located between the X-ray source 100 and the flat panel detector 200 .

[0083] In the embodiment of the present application, when the first pole lug 5011 is inspected, the position can be adjusted so that the line connecting the center of the X-ray source 100 and the center of the surface of the first pole lug 5011 facing the X-ray source 100 is perpendicular to the surface of the first pole lug 5011 facing the X-ray source 100, and then the first pole lug 5011 is inspected. When the second pole lug 5012 is inspected, the carrying platform can be controlled to move along the first direction Y, and the moving distance is equal to the distance between the center of the surface of the first pole lug 5011 facing the X-ray source 100 and the center of the surface of the second pole lug 5012 facing the X-ray source 100, so that when the second pole lug 5012 is inspected, the line connecting the center of the X-ray source 100 and the center of the surface of the second pole lug 5012 facing the X-ray source 100 is perpendicular to the surface of the second pole lug 5012 facing the X-ray source 100, thereby reducing the influence of edge distortion.

[0084] In an embodiment of the present application, the two pole ears (the first pole ear 5011 and the second pole ear 5012) of the battery cell 500 are detected separately. On the one hand, when the image is subsequently detected, less information needs to be processed for each detection, which is faster; on the other hand, the distance between the X-ray source 100 and the boundary of the pole ears in the two detections will be smaller, which can reduce the influence of edge distortion on the detection results to a certain extent.

[0085] According to some embodiments of the present application, Figure 5 This is a control flow chart of the controller of some embodiments of the present application. Figure 5 , step S13 includes configuring the controller 400 to:

[0086] Step S131: collecting a plurality of original images including the first pole lug based on the rays received by the flat panel detector.

[0087] Step S132: Process multiple original images to obtain a first detection image of the first electrode tab.

[0088] In an embodiment of the present application, the original image is an unprocessed image, and the first pole ear 5011 in the image is not clear enough. After processing multiple original images, the first pole ear 5011 in the image becomes clearer and the defects of the first pole ear 5011 are more easily identified.

[0089] In the embodiment of the present application, if only one original image is collected, if this image has an error, the first detection image processed later will also have an error, affecting the accuracy of the detection. In the embodiment of the present application, multiple original images are collected and processed. If one of the original images has an error, the other original images are still correct, which can also reduce the impact of the error on the detection result.

[0090] In the embodiment of the present application, if the battery cell 500, the X-ray source 100, and the flat panel detector 200 are all fixed during the acquisition process, the difference between the multiple original images is small.

[0091] In the embodiment of the present application, the number of the collected original images of the first electrode tab can be set according to the requirements. For example, 10 original images can be collected.

[0092] According to some embodiments of the present application, Figure 6 This is a control flow chart of the controller of some embodiments of the present application. Figure 6 , step S132 includes configuring the controller 400 to:

[0093] Step S1321: performing noise reduction processing on multiple original images to obtain a first image.

[0094] Step S1322: intercepting the area including the first electrode tab in the first image to obtain a second image.

[0095] Step S1323: performing image enhancement processing on the second image to obtain a first detection image of the first electrode tab.

[0096] In the embodiments of the present application, the noise reduction process can remove irrelevant information in multiple original images, reduce the noise in the original images, and improve the signal-to-noise ratio of the original images.

[0097] In an embodiment of the present application, after obtaining the first image, the first image can be saved, and the plurality of original images can be deleted to release memory.

[0098] The original image includes not only the first pole ear 5011 but also other areas. In the embodiment of the present application, the area with the first pole ear 5011 is cut out. On the one hand, it can reduce subsequent calculations, and on the other hand, it can reduce the impact of errors in other areas on the defect detection of the first pole ear 5011.

[0099] In an embodiment of the present application, multiple original images are processed through the above steps to obtain a first detection image of the first pole ear 5011. A similar method can also be used to control the flat panel detector 200 to collect multiple original images including the second pole ear 5012, and perform the above processing on the multiple original images to obtain a second detection image of the second pole ear 5012.

[0100] In an embodiment of the present application, the image enhancement processing of the second image includes contrast enhancement and / or filtering, which can enhance the contrast of each part in the second image, highlight the tab defect area, and facilitate algorithm recognition. The image enhancement processing of the second image includes contrast enhancement and / or filtering, which can be characterized as only contrast enhancement of the second image; only filtering of the second image; or both contrast enhancement and filtering of the second image.

[0101] In the embodiment of the present application, through the processing of the above steps, the first pole tab 5011 in the first detection image can be made clearer, the defective area can be more prominent, and the defect in the first pole tab 5011 can be more easily identified.

[0102] In an embodiment of the present application, the inspection image and the corresponding defect information can be uploaded to a cloud system for easy viewing and data tracing.

[0103] According to some embodiments of the present application, the size of the first electrode tab 5011 is stored in the controller 400. Figure 7 This is a control flow chart of the controller of some embodiments of the present application. Figure 7 , step S1322 includes configuring the controller 400 to:

[0104] Step S13221: Identify the position of the first pole lug in the first image based on the grayscale value in the first image.

[0105] Step S13222: based on the position and size of the first pole lug, cut out the area including the first pole lug in the first image to obtain a second image.

[0106] Since materials of different thicknesses have different attenuation degrees for X-rays, different grayscale values ​​are displayed in the first image. The outline of the first pole ear 5011 can be identified through the grayscale value, thereby determining the position of the first pole ear 5011 in the first image.

[0107] The controller 400 stores the size of the first pole lug 5011 and leaves a certain size tolerance for interception so that the intercepted area is slightly larger than the first pole lug. This can avoid, to a certain extent, intercepting part of the first pole lug and affecting the accuracy of detection.

[0108] Exemplarily, the difference between the area of ​​the intercepted region and the area of ​​the first pole ear in the first image, and the ratio of the area of ​​the first pole ear in the first image are greater than or equal to 5% and less than or equal to 20%, which can leave a certain size tolerance for the interception and avoid, to a certain extent, that the intercepted region is too large to affect subsequent calculations.

[0109] In an embodiment of the present application, based on the position of the first pole lug and the size of the first pole lug, the area including the first pole lug in the first image is cut out so that the second image can include the first pole lug 501, while at the same time avoiding to a certain extent that the second image is too large and includes too many other areas, which will affect the defect detection of the first pole lug 5011.

[0110] According to some embodiments of the present application, a defect detection model is stored in the controller 400, and step S20 includes configuring the controller 400 to:

[0111] Step S21: input the detection image into the defect detection model to obtain the defect information of the tab output by the defect detection model.

[0112] In an embodiment of the present application, a plurality of defect types are stored in the defect detection model. After the detection image is input into the defect detection model, the defect information of the tab in the detection image can be quickly identified based on the stored defect types.

[0113] In an embodiment of the present application, the various defect types stored in the defect detection model include various information such as the type of defect, the size of the defect, and the location of the defect.

[0114] According to some embodiments of the present application, Figure 8This is a control flow chart of the controller of some embodiments of the present application. Figure 8 ,The training process of the defect detection model includes:

[0115] Step S30: acquiring a sample inspection image including a tab of a sample battery cell obtained by photographing under irradiation of an X-ray source.

[0116] Step S40: marking the real defect information in the sample detection image.

[0117] Step S50: inputting the sample detection images into the defect detection model at the same time to obtain the predicted defect information of the sample battery cell output by the defect detection model.

[0118] Step S60: Calculate the loss value based on the actual defect information and the predicted defect information.

[0119] Step S70: adjusting the parameters of the defect detection model based on the loss value.

[0120] In the embodiments of the present application, not only can the parameters of the defect detection model be improved through sample battery cells, but also the detection image of the tab detected each time can be used to improve the parameters of the defect detection model.

[0121] For example, after the detection is completed, the defects in the detection image can be calibrated to facilitate observation and verification by the staff. If errors occur, the parameters of the defect detection model can be adjusted according to the errors to form a more accurate defect detection model.

[0122] Exemplarily, the defect detection model can continuously learn the grayscale features of the detection image through a convolutional neural network, adjust internal parameters, and improve the defect detection model.

[0123] In the embodiment of the present application, before the test, the defect samples of various sizes and types to be detected can be defined according to the test requirements to make a sample battery cell, and the real defect information in the sample battery cell can be marked. Then the sample battery cell is tested, and the predicted defect information of the sample battery cell output by the defect detection model is compared with the real defect information, and the parameters of the defect detection model are continuously improved to make the defect detection more accurate.

[0124] According to some embodiments of the present application, the defect information includes tab folding and / or tab breakage.

[0125] Both tab folding and tab breakage are tab defects. By setting tab folding and / or tab breakage as defect information, the tab defects can be detected.

[0126] According to some embodiments of the present application, the X-ray source 100 includes an integrated X-ray source.

[0127] The integrated X-ray source has a low rework rate, high stability, small size, and simple later maintenance. The X-ray source 100 is set as an integrated X-ray source to improve the reliability of the detection device.

[0128] According to some embodiments of the present application, Fig. 9 This is a front view of the detection device of some embodiments of the present application. Fig. 9 , the distance between the X-ray source 100 and the carrying platform 300 is L1, and the distance between the flat panel detector 200 and the carrying platform 300 is L2, wherein L2 and L1 satisfy: L2>L1.

[0129] In the embodiment of the present application, during the detection process, it can be understood that: the distance L1 between the X-ray source 100 and the carrying platform 300 is the distance between the X-ray source 100 and the battery cell 500, wherein the thickness of the battery cell 500 is smaller than L1, and the thickness of the battery cell 500 can be ignored. The distance L2 between the flat panel detector 200 and the carrying platform 300 is the distance between the flat panel detector 200 and the battery cell 500, wherein the distance L2 between the flat panel detector 200 and the carrying platform 300 is the distance between the surface of the carrying platform 300 facing the X-ray source 100 and the flat panel detector 200.

[0130] In the embodiment of the present application, the X-ray source 100 emits a conical shape. According to the principle of similar triangles, the magnification during detection is

[0131] In the embodiment of the present application, L2>L1 is defined so that the magnification during detection is greater than 2, making it easier to observe the tab defect from the detection image.

[0132] According to some embodiments of the present application, the distance L1 between the X-ray source 100 and the carrying platform 300 and the distance L2 between the flat panel detector 200 and the carrying platform 300 satisfy:

[0133] In the embodiment of the present application, if the magnification factor N is too small, the magnification effect cannot be achieved well. If the magnification factor N is too large, it may cause the detection image to be not clear enough, affecting the detection effect. The magnification factor is limited to the above range, so that the detection image can be magnified while avoiding affecting the detection effect to a certain extent.

[0134] According to some embodiments of the present application, the distance L1 between the X-ray source 100 and the carrying platform 300 satisfies: 30 mm (millimeter) ≤ L1 ≤ 50 mm.

[0135] In the embodiment of the present application, the outer contour of the rays emitted by the X-ray source 100 is conical. The smaller the distance L1 between the X-ray source 100 and the carrying platform 300 is, the smaller the radiation surface formed by the X-rays on the carrying surface of the carrying platform 300 is.

[0136] In the embodiment of the present application, if the distance L1 between the X-ray source 100 and the carrying platform 300 is too small, the radiation surface formed by the X-ray on the carrying surface of the carrying platform 300 is smaller, and part of the tab 501 of the battery cell 500 may not be irradiated by the X-ray, resulting in missed detection; if the distance L1 between the X-ray source 100 and the carrying platform 300 is too large, the size of the entire detection device is large. Limiting the distance L1 between the X-ray source 100 and the carrying platform 300 to 30mm≤L1≤50mm can avoid missed detection to a certain extent, and can also avoid the size of the entire detection device being too large to a certain extent.

[0137] In the embodiment of the present application, the distance L1 between the X-ray source 100 and the carrying platform 300 can be adjusted so that the detection device can detect battery cells 500 of different sizes.

[0138] According to some embodiments of the present application, a distance L2 between the flat panel detector 200 and the carrying platform 300 satisfies: 50 mm≤L2≤200 mm.

[0139] In the embodiment of the present application, if the distance L2 between the flat panel detector 200 and the carrying platform 300 is too small, the magnification will be too small, and the effect of magnifying the detection image cannot be well achieved. If the distance L2 between the flat panel detector 200 and the carrying platform 300 is too large, the size of the entire detection device is large. Limiting the distance L2 between the flat panel detector 200 and the carrying platform 300 to 50mm≤L2≤200mm can both increase the magnification to a certain extent and avoid the entire detection device from being too large to a certain extent.

[0140] According to some embodiments of the present application, the voltage U of the X-ray source 100 satisfies: 70KV (kilovolt) ≤ U ≤ 90KV, and / or the current I of the X-ray source 100 satisfies: 80μA (microampere) ≤ I ≤ 120μA.

[0141] The energy of the X-rays emitted by the X-ray source 100 is related to the voltage U of the X-ray source 100. The greater the voltage U of the X-ray source 100, the greater the energy of the X-rays emitted by the X-ray source 100. The intensity of the X-rays emitted by the X-ray source 100 is related to the current I of the X-ray source 100. The greater the current I of the X-ray source 100, the greater the intensity of the X-rays emitted by the X-ray source 100.

[0142] The detection device provided in the embodiment of the present application is used to detect the pole ear 501 of the battery cell 500. The thickness of the pole ear 501 is thinner than the thickness of the battery cell 500 body. When detecting the pole ear 501, the voltage U of the X-ray source 100 and the current I of the X-ray source 100 must satisfy that the X-ray can penetrate the pole ear 501.

[0143] In an embodiment of the present application, the voltage U of the X-ray source 100 may satisfy: 70KV≤U≤90KV; or the current I of the X-ray source 100 may satisfy: 80μA≤I≤120μA; or the voltage U of the X-ray source 100 may satisfy: 70KV≤U≤90KV, and the current I of the X-ray source 100 may satisfy: 80μA≤I≤120μA.

[0144] In an embodiment of the present application, the voltage U of the X-ray source 100 is set to 70KV≤U≤90KV, and / or the current I of the X-ray source 100 is set to 80μA≤I≤120μA, so that the X-rays emitted by the X-ray source 100 can penetrate the pole ear 501 to achieve detection, and at the same time, there will be no overexposure phenomenon, which affects the accuracy of the detection.

[0145] According to some embodiments of the present application, the frame rate F of the flat panel detector 200 satisfies: 5fps≤F≤20fps. Wherein, fps means Frames Per Second, that is, the number of frames transmitted per second. In the embodiments of the present application, it can be expressed as the number of original images collected per second.

[0146] The frame rate F of the flat panel detector 200 is related to the number of original images collected at one time by the flat panel detector 200. By collecting multiple original images, the influence of accidental errors on the detection results is reduced.

[0147] In an embodiment of the present application, the frame rate F of the flat-panel detector 200 is set to 5fps≤F≤20fps, so that the flat-panel detector 200 can collect multiple original images at a time, which reduces the impact of accidental errors on the detection results. At the same time, it avoids collecting too many original images at a time to a certain extent, which makes the subsequent image processing time longer.

[0148] An embodiment of the present application provides a battery monomer production device, including the detection device of any one of the above embodiments.

[0149] The detection device provided in the embodiment of the present application can detect the battery cells after production, and remove the battery cells that fail the tab defect detection, thereby improving the safety of the battery cells.

[0150] The detection device provided in the embodiment of the present application can be placed behind the battery cell winding or lamination equipment. After winding or lamination, the pole pieces become battery cells. When the battery cells are circulated on the logistics line, a robot places the battery cells into the carrying platform without disassembly or additional processing, thereby realizing the detection of the battery cell pole ears.

[0151] In an embodiment of the present application, the battery cell production equipment may include multiple detection devices, and the multiple detection devices are arranged along the first direction Y. The multiple detection devices can respectively detect multiple battery cells 500 at the same time, which can improve the detection efficiency to a certain extent.

[0152] An embodiment of the present application provides a detection device for a battery cell pole ear, the detection device includes an X-ray source 100, a flat panel detector 200, a carrying platform 300 and a controller 400. The flat panel detector 200 is opposite to the exit port of the X-ray source 100, and the X-ray source 100, the flat panel detector 200 and the carrying platform 300 are all movable, and the moving trajectory of the carrying platform 300 passes between the X-ray source 100 and the flat panel detector 200. The controller 400 is electrically connected and / or communicatively connected to the X-ray source 100, the controller 400 is electrically connected and / or communicatively connected to the flat panel detector 200, and the controller 400 is electrically connected and / or communicatively connected to the carrying platform 300. The pole ear 501 of the battery cell 500 includes a first pole ear 5011 and a second pole ear 5012. The controller 400 is configured as:

[0153] Step S81: Control the carrying platform to move so that the first pole ear is located between the X-ray source and the flat panel detector.

[0154] Step S82: Control the X-ray source to emit rays that pass through the first pole ear and project onto the flat panel detector.

[0155] Step S83: determining a first detection image of the first pole lug based on the rays received by the flat panel detector.

[0156] Step S84: Control the carrying platform to move along the first direction so that the second electrode ear is located between the X-ray source and the flat panel detector.

[0157] Step S85: Control the X-ray source to emit rays that pass through the second electrode ear and project onto the flat panel detector.

[0158] Step S86: Determine a second detection image of the second pole lug based on the rays received by the flat panel detector.

[0159] Step S87: Determine the detection image of the tab based on the first detection image and the second detection image.

[0160] Step S88: input the detection image into the defect detection model to obtain the defect information of the tab output by the defect detection model.

[0161] Step S89: Determine the quality inspection result of the tab of the battery cell based on the defect information.

[0162] The inspection device provided in the embodiment of the present application can realize fully automatic inspection of the tabs of battery cells with high inspection rate and accuracy.

[0163] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 cell tab detection device, characterized in that: include: X-ray source; A flat panel detector, opposite to the exit port of the X-ray source; A carrying platform, located between the X-ray source and the flat panel detector; A controller, electrically and / or communicatively connected to the flat panel detector; Wherein, the controller is configured as: Acquire a detection image of the tab of the battery cell, wherein the detection image is a detection image of the tab acquired by the flat-panel detector based on the received radiation, when the radiation emitted by the X-ray source is projected onto the flat-panel detector through the tab of the battery cell placed on the carrying platform; Defect information of the tab is determined based on the detection image.

2. The detection device according to claim 1, characterized in that: The controller is also electrically and / or communicatively connected to the X-ray source, and the controller is also electrically and / or communicatively connected to the carrying platform, the pole lug comprises a first pole lug and a second pole lug, and the first pole lug and the second pole lug are arranged along a first direction; Wherein, obtaining the detection image of the tab of the battery cell includes configuring the controller to: Controlling the carrying platform to move so that the first pole ear is located between the X-ray source and the flat panel detector; Controlling the X-ray source to emit rays that pass through the first pole ear and project onto the flat panel detector; Determine a first detection image of the first pole lug based on the rays received by the flat panel detector; Controlling the carrying platform to move along the first direction so that the second pole ear is located between the X-ray source and the flat panel detector; Controlling the X-ray source to emit rays that pass through the second pole ear and project onto the flat panel detector; Determine a second detection image of the second pole lug based on the rays received by the flat panel detector; A detection image of the tab is determined based on the first detection image and the second detection image.

3. The detection device according to claim 2, characterized in that: Determining a first detection image of the first pole lug based on the radiation received by the flat panel detector includes configuring the controller to: Collecting a plurality of original images including the first pole lug based on the rays received by the flat panel detector; The plurality of original images are processed to obtain a first detection image of the first electrode tab.

4. The detection device according to claim 3, characterized in that: Processing the plurality of original images to obtain a first detection image of the first electrode lug includes configuring the controller to: Performing noise reduction processing on the multiple original images to obtain a first image; intercepting a region including the first electrode tab in the first image to obtain a second image; The second image is subjected to image enhancement processing to obtain a first detection image of the first electrode tab.

5. The detection device according to claim 4, characterized in that: The controller stores the size of the first pole lug, and intercepts a region including the first pole lug in the first image to obtain a second image, including configuring the controller to: Identifying a position of the first pole lug in the first image based on a grayscale value in the first image; Based on the position of the first pole tab and the size of the first pole tab, a region including the first pole tab in the first image is cut out to obtain a second image.

6. The detection device according to any one of claims 1 to 5, characterized in that: The controller stores a defect detection model, and determines the defect information of the tab based on the detection image, including configuring the controller to: The detection image is input into a defect detection model to obtain defect information of the tab output by the defect detection model.

7. The detection device according to claim 6, characterized in that: The training process of the defect detection model includes: Acquire a sample detection image including a tab of a sample battery cell obtained by photographing under the irradiation of the X-ray source; Marking real defect information in the sample inspection image; Inputting the sample detection images into the defect detection model simultaneously to obtain predicted defect information of the sample battery cell output by the defect detection model; Calculating a loss value based on the actual defect information and the predicted defect information; and Parameters of the defect detection model are adjusted based on the loss value.

8. The detection device according to any one of claims 1 to 7, characterized in that: The defect information includes tab folding and / or tab breakage.

9. The detection device according to any one of claims 1 to 8, characterized in that: The X-ray source comprises an integrated X-ray source.

10. The detection device according to any one of claims 1 to 9, characterized in that: The distance L1 between the X-ray source and the carrying platform, and the distance L2 between the flat panel detector and the carrying platform satisfy: L2>L1.

11. The detection device according to any one of claims 1 to 10, characterized in that: The distance L1 between the X-ray source and the carrying platform, and the distance L2 between the flat panel detector and the carrying platform satisfy:

12. The detection device according to any one of claims 1 to 11, characterized in that: The distance L1 between the X-ray source and the carrying platform satisfies: 30 mm ≤ L1 ≤ 50 mm.

13. The detection device according to any one of claims 1 to 12, characterized in that: The distance L2 between the flat panel detector and the carrying platform satisfies: 50mm≤L2≤200mm.

14. The detection device according to any one of claims 1 to 13, characterized in that: The voltage U of the X-ray source satisfies: 70KV≤U≤90KV, and / or the current I of the X-ray source satisfies: 80μA≤I≤120μA.

15. The detection device according to any one of claims 1 to 14, characterized in that: The frame rate F of the flat panel detector satisfies: 5fps≤F≤20fps.

16. A battery monomer production device, characterized in that: Comprising a detection device as claimed in any one of claims 1 to 15.

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