Detection device and battery production apparatus

Abstract

A detection device (400) and a battery production apparatus, relating to the technical field of batteries. The detection device (400) comprises a gantry (410), a ray source (420), a detector (430), and a bearing platform (440). The ray source (420) and the detector (430) are both connected to the gantry (410), and the detector (430) is opposite to an emission port of the ray source (420). The bearing platform (440) is located between the ray source (420) and the detector (430), wherein the ray source (420) and the detector (430) can rotate around a same rotation axis, and the rotation direction of the ray source (420) is the same as that of the detector (430), so that during rotation, the detector (430) is kept opposite to the emission port of the ray source (420), and the bearing platform (440) is located between the ray source (420) and the detector (430). The bearing platform (440) is used for placing a battery (500) under test. The detection device (400) can detect deformation of said battery (500).

Description

Testing equipment and battery production equipment

[0001] Cross-references

[0002] This application refers to Chinese patent application No. 202310797652.1 filed on June 30, 2023, entitled “Detection Device and Battery Production Equipment,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a detection device and battery production equipment. 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] During use, batteries may be subject to bumps or impacts, causing deformation. While external deformation can be measured directly with tools like calipers, it's impossible to determine whether internal deformation has occurred or the extent of such deformation. Excessive internal deformation can compromise battery safety. Therefore, detecting internal battery deformation is a pressing issue.

[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 detection device and a battery production device to detect deformation inside a battery.

[0008] An embodiment of the first aspect of the present application provides a detection device for detecting battery deformation, comprising: a scanning frame; a radiation source connected to the scanning frame; a detector connected to the scanning frame, and the detector is opposite to the radiation outlet of the radiation source; a carrying platform located between the radiation source and the detector, and the carrying platform is used to place the battery to be tested; wherein the radiation source and the detector can rotate around the same rotation axis, and the rotation direction of the radiation source is the same as the rotation direction of the detector, so that during rotation, the detector remains opposite to the radiation outlet of the radiation source, and the carrying platform is located between the radiation source and the detector.

[0009] In the technical solution of the embodiment of the present application, when using the detection device provided in the embodiment of the present application, the battery to be tested can be placed on a carrier platform, and then the radiation source emits radiation through the battery to be tested located on the carrier platform and projects it onto the detector, thereby achieving scanning detection of the battery to be tested. At the same time, during detection, the radiation source and the detector are controlled to rotate around the rotation axis. During rotation, the radiation source and the detector can circle the battery to be tested for detection, making the detection more comprehensive and avoiding missed detections to a certain extent. After the battery to be tested is tested, the deformation of the battery to be tested can be obtained based on the detection image, thereby achieving comprehensive detection of the deformation of the battery to be tested.

[0010] In some embodiments, a scanning gantry comprises: a base having a mounting recess; a scanning ring at least partially located within the mounting recess, the scanning ring being rotatable about a rotation axis; wherein a radiation source and a detector are both connected to the scanning ring, and the radiation source and the detector are located at opposite ends of one diameter of the scanning ring. The scanning gantry is configured as a base and a scanning ring, with the radiation source and the detector respectively arranged at opposite ends of one diameter of the scanning ring. When the scanning ring rotates, the relative positions of the radiation source and the detector remain unchanged, thereby ensuring that the detector remains relative to the radiation source's emission port during rotation. Controlling the rotation of the scanning ring to drive the rotation of the radiation source and the detector, since the relative positions of the radiation source and the detector are fixed, only the scanning ring needs to be rotated, without considering the rotation speed and direction of the radiation source and the detector. Separately controlling the radiation source and the detector requires consideration of their rotation speed and direction. Thus, in the embodiments of the present application, controlling the rotation of the radiation source and the detector by controlling the scanning ring is more convenient.

[0011] In some embodiments, the scanning frame further includes a support wheel positioned within the mounting recess and connected to the base, with the outer ring of the scanning ring abutting against the support wheel. The support wheel separates the base from the scanning ring. As the scanning ring rotates, the support wheel rolls, converting sliding friction between the base and the scanning ring into rolling friction between the support wheel and the scanning ring, thereby reducing friction and enabling smoother rotation of the scanning ring.

[0012] In some embodiments, the rotation angle α of the radiation source satisfies the following: α ≥ 180°. During testing, since the radiation emitted by the radiation source can penetrate two opposite sides of the battery under test, limiting the rotation angle α of the radiation source to 180° ensures that every part of the battery under test is detected, thereby reducing the possibility of missed detection to a certain extent and improving the accuracy of deformation detection.

[0013] In some embodiments, the carrying platform is movably positioned between the radiation source and the detector, with the movement direction of the carrying platform being parallel to the extension direction of the rotation axis. The carrying platform is movably positioned between the radiation source and the detector, enabling continuous battery testing by moving the carrying platform, thereby improving testing efficiency.

[0014] In some embodiments, the detection device further includes: a controller, wherein the radiation source is electrically and / or communicatively connected to the controller, and the detector is electrically and / or communicatively connected to the controller; wherein the controller is configured to: control the radiation source and the detector to rotate about a rotation axis; when the radiation source rotates, control the radiation source to emit radiation that passes through the battery under test located on the supporting platform and projects onto the detector; obtain a detection image of the battery under test based on the radiation received by the detector; and determine deformation information of the battery under test based on the detection image. The method provided in the embodiments of the present application can detect the deformation of the battery under test and achieve automatic detection.

[0015] In some embodiments, when the scanning gantry includes a base and a scanning ring, controlling the radiation source and detector to rotate about a rotation axis includes configuring a controller to control the scanning ring to rotate about the rotation axis. Because both the radiation source and the detector are connected to the scanning ring, controlling the scanning ring to rotate about the rotation axis can achieve rotation of the radiation source and the detector.

[0016] In some embodiments, the battery under test includes a bottom surface having a glue-coated area, and the controller is further configured to control the bottom surface of the battery under test to mate with the supporting surface of the supporting platform. The mate between the bottom surface of the battery under test and the supporting surface of the supporting platform ensures that the battery under test is in the same state as when loaded in a vehicle during testing. This can, to a certain extent, avoid unforeseen defects such as misalignment of the internal structure caused by upright placement or rotation of the battery under test, which could affect its reliability.

[0017] In some embodiments, when the carrying platform is movable along the extension direction of the rotation axis, the controller is further configured to control the carrying platform to move along the extension direction of the rotation axis so that the carrying platform is positioned between the radiation source and the detector. Positioning the carrying platform between the radiation source and the detector allows radiation emitted by the radiation source to pass through the battery under test located on the carrying platform and project onto the detector.

[0018] In some embodiments, obtaining a test image of the battery under test based on radiation received by a detector includes configuring a controller to: collect multiple original images based on the radiation received by the detector; perform three-dimensional reconstruction on the multiple original images to obtain multiple cross-sectional test images of the battery under test, where the cross sections of the multiple cross-sectional test images are parallel and sequentially spaced along the extension direction of the rotation axis; and determine a test image of the battery under test based on the multiple cross-sectional test images. This method can produce a clearer test image and more easily identify the deformation of the battery under test.

[0019] In some embodiments, determining a test image of a battery under test based on multiple cross-sectional test images includes configuring a controller to: blur each of the multiple cross-sectional test images to obtain multiple first images; perform convolution processing on each of the multiple first images to obtain multiple second images; and enhance each of the multiple second images to obtain a test image of the battery under test. By processing the images using the above method, the contour edges of the battery under test in the test image can be more easily identified, indicating deformation of the battery under test.

[0020] In some embodiments, the distance between any two adjacent cross-sectional detection images in the plurality of cross-sectional detection images is greater than or equal to 0.05 mm, and less than or equal to 0.5 mm. If the distance between any two adjacent cross-sectional detection images is set too small, for example, less than 0.05 mm, then there will be too many cross-sectional detection images processed, resulting in more subsequent calculation procedures, affecting the detection efficiency. If the distance between any two adjacent cross-sectional detection images is set too large, for example, greater than 0.5 mm, the part with the largest deformation may be skipped, and the error of the determined maximum deformation may be large, affecting the accuracy of the detection. The scope set in the embodiment of the present application can also avoid skipping the maximum deformation to a certain extent and improve the accuracy of the detection while improving the detection efficiency.

[0021] In some embodiments, determining deformation information of the battery under test based on the detection image includes configuring the controller to: determine the amount of deformation of the battery under test based on the detection image; and determine the deformation information of the battery under test based on the deformation amount. The amount of deformation of the battery under test is a criterion for determining whether the deformation test of the battery under test has passed. The deformation information of the battery under test can be determined based on the deformation amount.

[0022] In some embodiments, determining the deformation of the battery under test based on the detection image includes configuring the controller to: identify the bottom surface of the battery under test in the detection image; determine the distance between the bottom surface and the battery cells in the battery under test; and determine the deformation of the battery under test based on the distance. If internal deformation of the battery under test increases the distance between the bottom surface and the battery cells in the battery under test, the deformation of the battery under test can be determined based on the distance between the bottom surface and the battery cells in the battery under test.

[0023] In some embodiments, the controller is further configured to: determine that the battery under test is unqualified in response to the deformation being greater than a preset value. When the deformation is greater than the preset value, it indicates that the deformation of the battery under test is too large, which will affect the stability of the battery under test, and the battery under test is determined to be unqualified.

[0024] In some embodiments, the preset value is greater than or equal to 1 mm and less than or equal to 3 mm. If the deformation of the battery is small, the impact on battery reliability is small. If the preset value is set too small, for example, less than 1 mm, too many batteries may be deemed unqualified, affecting battery production. If the preset value is set too large, for example, greater than 3 mm, the deformation in the battery will be large, affecting battery reliability. Setting the preset value to greater than or equal to 1 mm and less than or equal to 3 mm can improve battery reliability while ensuring battery production to a certain extent.

[0025] An embodiment of the second aspect of the present application provides a battery production device, which includes the detection device in the above embodiment.

[0026] 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

[0027] 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. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without paying creative work.

[0028] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0029] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0030] FIG3 is a front view of a detection device according to some embodiments of the present application;

[0031] FIG4 is a front view of a support wheel in some embodiments of the present application;

[0032] FIG5 is a front view of the detection device in another state according to some embodiments of the present application;

[0033] FIG6 is a front view of the detection device in another state according to some embodiments of the present application;

[0034] FIG7 is a block diagram of a detection device according to some embodiments of the present application;

[0035] FIG8 is a control flow chart of a controller according to some embodiments of the present application;

[0036] FIG9 is a control flow chart of a controller according to some embodiments of the present application;

[0037] FIG10 is a control flow chart of a controller according to some embodiments of the present application;

[0038] FIG11 is a control flow chart of a controller according to some embodiments of the present application;

[0039] FIG12 is a control flow chart of a controller according to some embodiments of the present application;

[0040] FIG13 is a control flow chart of a controller according to some embodiments of the present application. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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).

[0047] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," 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.

[0049] 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.

[0050] During use, the battery may be bumped or hit, causing external deformation of the battery. If the deformation is too large, it may also cause internal deformation of the battery. The deformation of the battery's exterior can be directly observed, and the size of the deformation can also be measured using measuring tools such as calipers. However, the internal deformation of the battery cannot be directly observed, and the size of the internal deformation of the battery is even more unknown. If the size of the internal deformation of the battery is small, it will not affect the reliability of the battery and can continue to be used. If the size of the internal deformation of the battery is too large, it may affect the reliability of the battery. After the external deformation of the battery, since the internal deformation of the battery cannot be known, if the battery is directly discarded, it will cause a lot of waste. If it continues to be used, the internal deformation of the battery may be too large, affecting the reliability of the battery.

[0051] An embodiment of the present application provides a detection device, which places a battery to be tested on a carrying platform. The rays emitted by the ray source pass through the battery to be tested on the carrying platform and are projected onto the detector. At the same time, by rotating the ray source and the detector, the ray source and the detector can detect the entire battery to be tested during rotation, thereby achieving comprehensive detection of battery deformation.

[0052] The detection device and battery production equipment disclosed in the embodiments of this application can be used in the battery production process. The detected or produced batteries can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. The power supply system of such electrical devices can be composed of batteries equipped with the batteries disclosed in this application.

[0053] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0055] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0056] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0057] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. Battery 100 includes a housing 10 and battery cells 20, with battery cells 20 housed within housing 10. Housing 10 provides storage space for battery cells 20 and can have various structures. In some embodiments, housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for battery cells 20. Second portion 12 can be a hollow structure with one end open. First portion 11 can be a plate-like structure, with first portion 11 overlapping the open side of second portion 12, so that the first and second portions 11 and 12 together define a storage space. Alternatively, first portion 11 and second portion 12 can each be a hollow structure with one end open, with the open side of first portion 11 overlapping the open side of second portion 12. Housing 10 formed by first portion 11 and second portion 12 can have various shapes, such as a cylinder or a rectangular parallelepiped.

[0058] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0059] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0060] Embodiments of the present application provide a detection device for detecting battery deformation. FIG3 is a front view of the detection device according to some embodiments of the present application. Referring to FIG3 , the detection device 400 includes a scanning frame 410, a radiation source 420, a detector 430, and a supporting platform 440. The radiation source 420 and the detector 430 are both connected to the scanning frame 410, with the detector 430 facing the radiation outlet of the radiation source 420. The supporting platform 440 is located between the radiation source 420 and the detector 430. The radiation source 420 and the detector 430 are rotatable about the same rotation axis O, with the rotation direction of the radiation source 420 and the rotation direction of the detector 430 being the same, so that during rotation, the detector 430 remains facing the radiation outlet of the radiation source 420, and the supporting platform 440 is located between the radiation source 420 and the detector 430. For ease of explanation, FIG3 also shows a battery 500 to be tested, and the supporting platform 440 is used to place the battery 500 to be tested.

[0061] The scanning frame 410 can be any component used to mount the radiation source 420 and the detector 430 to improve the stability of the radiation source 420 and the detector 430. It can be used to secure the radiation source 420 and the detector 430. When the radiation source 420 and the detector 430 are mounted on the scanning frame 410, the detector 430 can be aligned with the radiation outlet of the radiation source 420. This allows the radiation emitted by the radiation source 420 to pass through the battery 500 under test on the supporting platform 440 and project onto the detector 430, thereby enabling the battery 500 under test to be tested.

[0062] The radiation source 420 is a device for emitting detection radiation, and is primarily composed of a radiation tube, a cooling system, and a corresponding control system. The detection radiation can be X-rays or other radiation, and the radiation tube can emit corresponding detection radiation, such as an X-ray tube or a gamma-ray tube. In one example, the radiation source 420 is an electron linear accelerator, and the detection radiation it emits is X-rays. When the detection radiation emitted by the radiation source 420 passes through the battery under test 500, due to differences in thickness or material of different regions of the battery under test 500, the absorption rate of the X-rays varies. Therefore, detection can be performed based on the different degrees of X-ray absorption.

[0063] The radiation emitted by radiation source 420 is penetrating. Materials of varying thicknesses attenuate the radiation to varying degrees, resulting in varying amounts of radiation detected by detector 430. Detector 430 contains a layer of radiation-induced luminescent material that, when stimulated by radiation, emits a visible light signal. This visible light signal is transmitted to a photoelectric converter, forming an electrical signal. This signal is then output as a digital signal via an internal electrical signal transmission circuit, representing the image formed as a contrast between light and dark. Radiation attenuates after passing through the object being detected. The more radiation that passes through, the more luminescent signal the photosensitive material emits, resulting in a brighter area in the final image. Conversely, the fewer radiation that passes through, the darker the area in the image. Detector 430 can be a flat-panel detector or a linear array detector, and this is not limited in this embodiment of the present application.

[0064] The carrying platform 440 can be any carrying structure that can fix the battery 500 to be tested in a supporting or clamping manner, such as a tray, a clamp, etc. The carrying platform 440 can be fixed or movable, such as a tray or a clamping mechanism that is provided with a conveying track and moves along the conveying track. The number of batteries 500 to be tested carried on the carrying platform 440 can be one or more. In one example, the carrying platform 440 can include multiple trays, each tray carrying one or more batteries 500 to be tested. The battery 500 to be tested can be a battery 100 including multiple battery cells 20.

[0065] In the embodiment of the present application, the load-bearing capacity of the carrying platform 440 is greater than the weight of the battery to be tested 500 placed thereon.

[0066] In the embodiment of the present application, the thickness of each area of ​​the carrying platform 440 is equal, which reduces the impact on the detection results.

[0067] In an embodiment of the present application, the ray source 420 and the detector 430 can rotate around the same rotation axis O. The ray source 420 and the detector 430 can rotate on the scanning frame 410, or the scanning frame 410 can rotate to drive the ray source 420 and the detector 430 to rotate.

[0068] In the embodiment of the present application, when the radiation source 420 and the detector 430 rotate, it is necessary to ensure that the supporting platform 440 is located between the radiation source 420 and the detector 430, so that during detection, the radiation emitted by the radiation source 420 can pass through the battery under test 500 on the supporting platform 440 and be projected onto the detector 430. As shown in Figure 3, the rotation axis O can be located on the supporting surface of the supporting platform 440, so that when the radiation source 420 and the detector 430 rotate, the supporting platform 440 is always located between the radiation source 420 and the detector 430. The radiation source 420 and the detector 430 can rotate clockwise or counterclockwise.

[0069] The rotation axis O is a virtual line, not a real line. In FIG3 , the rotation axis O is perpendicular to the plane in the figure, so in FIG3 , the rotation axis O is replaced by a dot.

[0070] When using the detection device provided in the embodiment of the present application, the battery 500 to be tested can be placed on the supporting platform 440, and then the ray source 420 emits rays through the battery 500 to be tested on the supporting platform 440 and projects them onto the detector 430, thereby achieving scanning detection of the battery 500 to be tested. At the same time, during the detection, the ray source 420 and the detector 430 are controlled to rotate around the rotation axis O. During the rotation, the ray source 420 and the detector 430 can circle the battery 500 to be tested, making the detection more comprehensive and avoiding missed detections to a certain extent. After the battery 500 to be tested is tested, the deformation of the battery 500 to be tested can be obtained based on the detection image, thereby achieving comprehensive detection of the deformation of the battery 500 to be tested.

[0071] When the detection device provided in the embodiment of the present application detects the battery 500 to be tested, there is no need to disassemble the battery 500 to be tested, and non-destructive testing of the battery 500 to be tested can be achieved.

[0072] According to some embodiments of the present application, referring to FIG3 , a scanning frame 410 includes a base 411 and a scanning ring 412, the base 411 having a mounting groove 4111, at least a portion of the scanning ring 412 being located in the mounting groove 4111, and the scanning ring 412 being rotatable around a rotation axis O, wherein both a ray source 420 and a detector 430 are connected to the scanning ring 412, and the ray source 420 and the detector 430 are located at opposite ends of one diameter of the scanning ring 412.

[0073] The base 411 provides support for the entire detection device and improves the stability of the entire detection device. The material of the base 411 is not limited, and the material of the base 411 can be metal or non-metal.

[0074] As shown in FIG3 , the cross-section of the mounting groove 4111 is hexagonal and symmetrically distributed. In other implementations, the cross-section of the mounting groove 4111 may be other shapes, such as circular, square, etc.

[0075] The scanning ring 412 is rotatable in a ring shape. The scanning ring 412 can rotate counterclockwise or clockwise. The ray source 420 and the detector 430 are located at opposite ends of one diameter of the scanning ring 412, so that the rays emitted by the ray source 420 can be projected onto the detector 430.

[0076] In an embodiment of the present application, a scanning frame 410 is configured as a base 411 and a scanning ring 412, and a radiation source 420 and a detector 430 are respectively arranged at opposite ends of one diameter of the scanning ring 412. When the scanning ring 412 rotates, the relative positions of the radiation source 420 and the detector 430 do not change, so that during rotation, the detector 430 always remains relative to the emission port of the radiation source 420. By controlling the rotation of the scanning ring 412, the radiation source 420 and the detector 430 are driven to rotate. Since the relative positions of the radiation source 420 and the detector 430 are fixed, only the scanning ring 412 needs to be rotated, and the rotation speed and direction of the radiation source 420 and the detector 430 do not need to be considered. In contrast, separate control of the radiation source 420 and the detector 430 requires consideration of the rotation speed and direction of the radiation source 420 and the detector 430. In other words, the embodiment of the present application controls the rotation of the radiation source 420 and the detector 430 by controlling the scanning ring 412, which is more convenient.

[0077] According to some embodiments of the present application, referring to FIG. 3 , the scanning frame 410 further includes a support wheel 413 , which is located in the mounting groove 4111 and connected to the base 411 , and the outer ring of the scanning ring 412 abuts against the support wheel 413 .

[0078] In an embodiment of the present application, since the outer ring of the scanning ring 412 is against the support wheel 413, the support wheel 413 can provide support for the scanning ring 412. At the same time, when the scanning ring 412 rotates, the support wheel 413 can rotate without affecting the rotation of the scanning ring 412.

[0079] In some embodiments of the present application, the support wheel 413 can be directly bonded to the inner wall of the mounting groove 4111, or the support wheel 413 can be fixedly connected to the inner wall of the mounting groove 4111 by screws.

[0080] The position and number of the support wheels 413 can be set as needed. For example, as shown in FIG3 , a support wheel 413 is symmetrically arranged on each of the four inner walls of the mounting groove 4111, so that the support force of the scanning ring 412 is evenly distributed, thereby improving the stability of the scanning ring 412. In other implementations, the position and number of the support wheels 413 can be set in other ways, and the embodiments of the present application are not limited thereto.

[0081] In an embodiment of the present application, the support wheel 413 separates the base 411 from the scanning ring 412. When the scanning ring 412 rotates, the support wheel 413 rolls, which can convert the sliding friction between the base 411 and the scanning ring 412 into rolling friction between the support wheel 413 and the scanning ring 412, thereby reducing the friction force and making the rotation of the scanning ring 412 smoother.

[0082] In some embodiments of the present application, FIG4 is a front view of a support wheel according to some embodiments of the present application. The support wheel 413 includes a support block 4131 and a roller 4132. The roller 4132 is partially located within the support block 4131, and a portion of the roller 4132 extends outside the support block 4131. The roller 4132 is rotatable. The support block 4131 is used to connect to the base 411, and the roller 4132 is used to roll when the scanning ring 412 rotates to avoid affecting the rotation of the scanning ring 412.

[0083] In other embodiments of the present application, the support wheel 413 may comprise only a roller, with a groove formed on the sidewall of the mounting groove 4111. The roller is partially located within the groove, while the other portion extends outside the groove. The roller is rotatable and abuts against the outer ring of the scanning ring 412. In other words, the support block 4131 is omitted, simplifying the structure of the detection device.

[0084] According to some embodiments of the present application, the rotation angle α of the ray source 420 satisfies: α≥180°.

[0085] FIG5 is a front view of the detection device of some embodiments of the present application in another state. FIG6 is a front view of the detection device of some embodiments of the present application in another state. The scanning ring 412 in the detection device shown in FIG3 rotates along a certain angle β to obtain the detection device shown in FIG5 , and the scanning ring 412 rotates along the rotation direction A by a certain angle to obtain the detection device shown in FIG6 , and the scanning ring 412 in the detection device shown in FIG3 rotates a total of α to obtain the detection device shown in FIG6 . It should be noted that in FIG5 and FIG6 , in order to clarify the rotation angle of the detection device, the carrying platform 440 and the battery to be tested 500 are omitted in FIG5 and FIG6 .

[0086] In the embodiment of the present application, since the scanning ring 412 can rotate back and forth, the ray source 420 can rotate in two opposite directions.

[0087] The rotation angle α of the ray source 420 in the embodiment of the present application refers to the maximum angle at which the ray source 420 rotates during detection. It does not mean the maximum angle at which the ray source 420 itself can rotate, nor does it mean that all angles at which the scanning ring 412 rotates during the detection process must be greater than or equal to 180°. Taking Figures 3, 5, and 6 as examples, assuming that α = 180°, Figure 3 is the state before the start of detection, and Figure 6 is the maximum angle at which the scanning ring 412 rotates during the detection process. At this time, the maximum angle is equal to 80°, but the scanning ring 412 in the detection device shown in Figure 6 can still rotate in direction A. Figure 5 is an intermediate state, β < 180°. During detection, the angle of rotation of the scanning ring 412 in one of the states can be less than 180°.

[0088] The detection device of the embodiment of the present application detects deformation of the battery 500 under test. Deformation can occur at any location on the battery 500 under test. During detection, since the radiation emitted by the radiation source 420 can penetrate two opposing sides of the battery 500 under test, the rotation angle α of the radiation source 420 is limited to ≥ 180°. This ensures that every location on the battery 500 under test is detected, thereby minimizing the possibility of missed detections and improving the accuracy of deformation detection.

[0089] According to some embodiments of the present application, the carrying platform 440 is movably located between the ray source 420 and the detector 430 , and the moving direction of the carrying platform 440 is parallel to the extending direction of the rotation axis O.

[0090] In other implementations of the present application, the carrying platform 440 may be a conveyor belt, or the carrying platform 440 may be a ring guide rail, etc.

[0091] For example, when the carrying platform 440 is an annular guide rail, the upper tray on the annular guide rail may be made of carbon fiber, which can reduce the impact on detection.

[0092] The detection device provided in the embodiments of the present application can be placed after the battery manufacturing process is completed. The completed battery is directly transported to the space between the radiation source 420 and the detector 430 via the carrier platform 440 for testing. After the testing is completed, it is transported to the next stage via the carrier platform 440. In other implementations, the battery 500 to be tested can be moved to the carrier platform 440 using a mechanical gripper or a crane.

[0093] The moving direction of the carrying platform 440 is parallel to the extending direction A of the rotation axis O, so that the movement of the carrying platform 440 does not interfere with the scanning ring 412 .

[0094] The carrying platform 440 in the embodiment of the present application is movably positioned between the radiation source 420 and the detector 430 . The carrying platform 440 can be moved to achieve continuous detection of the battery, thereby improving detection efficiency.

[0095] According to some embodiments of the present application, FIG7 is a block diagram of a detection device according to some embodiments of the present application. The detection device further includes a controller 450, a radiation source 420 electrically and / or communicatively connected to the controller 450, and a detector 430 electrically and / or communicatively connected to the controller 450.

[0096] FIG8 is a control flow chart of a controller according to some embodiments of the present application. Referring to FIG8 , the controller 450 is configured to:

[0097] Step S10: controlling the ray source and the detector to rotate around the rotation axis.

[0098] Step S20: When the ray source rotates, the ray source is controlled to emit rays that pass through the battery to be tested on the supporting platform and project to the detector.

[0099] Step S30: acquiring a detection image of the battery to be tested based on the rays received by the detector.

[0100] Step S40: Determine deformation information of the battery to be tested based on the detection image.

[0101] In some embodiments of the present application, the controller 450 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.

[0102] In an embodiment of the present application, the detector 430 can be calibrated before detection begins to reduce errors in the detected image. For example, the detector 430 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 radiation source 420 and the surface of the detector 430, and there are no obstructions between the radiation source 420 and the detector 430. The radiation must fully cover the receiving surface of the detector 430. The grayscale value of the image of the detection device at this time can be adjusted to the calibrated grayscale value.

[0103] For example, when using the detection device to detect the battery 500 to be tested, the battery 500 to be tested can be placed on the carrying platform 440 so that the large surface of the battery 500 to be tested is in contact with the carrying surface of the carrying platform 440, that is, the thickness direction of the battery 500 to be tested is perpendicular to the carrying surface, and then the battery 500 to be tested is detected using the radiation source 420 and the detector 430.

[0104] In the embodiment of the present application, the deformation information of the battery 500 to be tested can be used to indicate whether the deformation of the battery 500 to be tested is qualified.

[0105] In the embodiment of the present application, if there is deformation inside the battery 500 to be tested, the boundary of the deformed portion will change. The boundary change of the deformed portion can be observed in the detection image, thereby determining the deformation information of the battery 500 to be tested.

[0106] The method provided in the embodiment of the present application can detect the deformation of the battery 500 to be tested, thereby realizing automatic detection.

[0107] According to some embodiments of the present application, when the scanning frame 410 includes a base 411 and a scanning ring 412, step S10 includes configuring the controller to:

[0108] Step S11: Control the scanning ring to rotate around the rotation axis.

[0109] In the embodiment of the present application, since the ray source 420 and the detector 430 are both connected to the scanning ring 412 , the rotation of the ray source 420 and the detector 430 can be achieved by controlling the scanning ring 412 to rotate around the rotation axis O.

[0110] In some embodiments of the present application, the scanning frame 410 may be electrically and / or communicatively connected to the controller 450 , and the scanning frame 410 may be controlled to slide by the controller 450 .

[0111] According to some embodiments of the present application, the battery under test 500 includes a bottom surface having a glue-coated area. FIG9 is a control flow chart of the controller of some embodiments of the present application. Referring to FIG9 , the controller 450 is further configured to:

[0112] Step S50: controlling the bottom surface of the battery to be tested to fit with the supporting surface of the supporting platform.

[0113] The battery under test 500 is shaped like a rectangular parallelepiped, with two opposing large surfaces and four side surfaces connecting the two large surfaces. The large surfaces are the top and bottom surfaces of the battery under test, with the top and bottom surfaces located in the first and second portions 11 and 12 of the housing 10, respectively. The bottom surface has a glued area where glue is applied to bond the battery cells. This area can be used to identify the bottom surface of the battery under test 500. For example, if the bottom surface is located in the second portion 12, then the second portion 12 has a glued area.

[0114] In an embodiment of the present application, the bottom surface of the battery 500 to be tested is in contact with the supporting surface of the supporting platform, so that the state of the battery 500 to be tested during testing can be the same as the state when loaded in the car. This can, to a certain extent, avoid unforeseen defects such as misalignment of the internal structure caused by the upright placement or rotation of the battery 500 to be tested, thereby affecting its reliability.

[0115] According to some embodiments of the present application, when the carrying platform is movable along the extension direction of the rotation axis O, referring to FIG. 9 , the controller is further configured to:

[0116] Step S60: controlling the carrying platform to move along the extension direction of the rotation axis so that the carrying platform is located between the ray source and the detector.

[0117] The carrying platform 440 is located between the ray source 420 and the detector 430 , so that the rays emitted by the ray source 420 can pass through the battery to be tested located on the carrying platform 440 and be projected onto the detector 430 .

[0118] In some embodiments of the present application, the carrying platform 440 may be electrically and / or communicatively connected to the controller 450 , so that the controller 450 may control the movement of the carrying platform 440 .

[0119] According to some embodiments of the present application, FIG10 is a control flow chart of a controller in some embodiments of the present application. Step S30 includes configuring the controller to:

[0120] Step S31: collecting multiple original images based on the rays received by the detector.

[0121] Step S32: performing three-dimensional reconstruction on the multiple original images to obtain multiple cross-sectional detection images of the battery to be tested, wherein the cross sections of the multiple cross-sectional detection images are parallel and arranged in sequence along the extension direction of the rotation axis.

[0122] Step S33: determining a detection image of the battery to be tested based on the multiple cross-sectional detection images.

[0123] In an embodiment of the present application, the original image is an unprocessed image, and the battery to be tested 500 in the image is not clear enough. After processing multiple original images, the battery to be tested 500 in the image becomes clearer, and it is easier to identify the deformation of the battery to be tested 500.

[0124] Since the multiple original images are collected while the ray source 420 and the detector 430 are rotating, an image of the entire battery 500 to be tested can be obtained by performing three-dimensional reconstruction on the multiple original images.

[0125] In the embodiment of the present application, since the deformation of the battery 500 under test during use generally takes the form of a dent, the deformation is primarily measured by measuring the depth of the dent. Since it is difficult to measure the deformation of the battery 500 under test in a three-dimensional image, and therefore it is impossible to determine whether the deformation is excessive, a cross-sectional view of the battery under test is determined based on the three-dimensional image. The cross-sectional view is a two-dimensional image, making it easier to identify the depth of the dent, and thus the deformation of the battery under test.

[0126] During the use of the battery, the bottom of the battery is more likely to be bumped and deformed, so more attention should be paid to the bottom surface of the battery during inspection. Since the bottom surface of the battery 500 to be tested is in contact with the supporting surface of the supporting platform 440 during inspection, the rotation axis O is located on the supporting surface of the supporting platform 440, and the cross-sections of the multiple cross-sectional inspection images are arranged in sequence along the extension direction of the rotation axis O. It can be understood that the cross-sectional inspection image is perpendicular to the bottom surface of the battery 500 to be tested, so that information on the bottom surface of the battery 500 to be tested can be obtained in each cross-sectional inspection image, thereby determining the deformation of the bottom surface of the battery 500 to be tested.

[0127] In the embodiment of the present application, a clearer detection image can be obtained by the above method, and the deformation amount of the battery to be tested can be more easily identified.

[0128] In the embodiment of the present application, the number of the multiple original images of the battery under test 500 collected can be set according to demand. The more original images collected, the more accurate the image of the battery under test obtained through 3D reconstruction, and the more accurate the detection result.

[0129] In an embodiment of the present application, the target area of ​​the cross-sectional detection image can be captured, and the required area can be captured and cropped to the surrounding information-free area, thereby improving image processing efficiency and reducing the image storage size.

[0130] According to some embodiments of the present application, FIG11 is a control flow chart of a controller in some embodiments of the present application. Step S33 includes configuring the controller to:

[0131] Step S331: performing blur processing on each of the multiple cross-sectional detection images to obtain multiple first images.

[0132] Step S332: performing convolution processing on each of the multiple first images to obtain multiple second images.

[0133] Step S333: performing enhancement processing on each of the plurality of second images to obtain a detection image of the battery to be tested.

[0134] In an embodiment of the present application, blurring is performed by removing unnecessary features in the cross-sectional inspection image, such as noise, interference lines, etc., while removing interference parts outside the battery to be tested, so that the necessary features in the first image are clearer and defect recognition is improved.

[0135] In an embodiment of the present application, convolution is to use a template to traverse all pixels in the first image, and replace the value of the central pixel of the template with the weighted average grayscale value of the pixels in the neighborhood determined by the template. The defect features in the second image after convolution processing are more obvious and easier to identify.

[0136] In the embodiment of the present application, the enhancement is to increase the brightness and contrast of the second image to highlight the contour edges of the battery cells in the battery to be tested.

[0137] By processing the image using the above method, the contour edge of the battery to be tested in the detection image can be more easily identified to identify the deformation of the battery to be tested 500 .

[0138] According to some embodiments of the present application, the distance between any two adjacent cross-sectional detection images in the plurality of cross-sectional detection images is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0139] If the battery 500 to be tested has a pit, the depth (deformation) of the pit is not the same at every location. After dividing the three-dimensional image of the battery to be tested into multiple cross-sectional detection images, there will be a deformation at the corresponding position on each cross-sectional detection image. The deformation with the largest value among the multiple deformations is the maximum deformation of the battery 500 to be tested.

[0140] In the embodiments of the present application, if the distance between any two adjacent cross-sectional detection images is set too small, for example, less than 0.05 mm, then the processed cross-sectional detection images will be too many, resulting in more subsequent calculation procedures and affecting the detection efficiency. If the distance between any two adjacent cross-sectional detection images is set too large, for example, greater than 0.5 mm, the part with the largest deformation may be skipped, and the error in the determined maximum deformation may be large, affecting the accuracy of the detection. The range set in the embodiments of the present application can, while improving the detection efficiency, also avoid skipping the maximum deformation to a certain extent and improve the accuracy of the detection.

[0141] According to some embodiments of the present application, FIG12 is a control flow chart of a controller in some embodiments of the present application. Step S40 includes configuring the controller to:

[0142] Step S41: Determine the deformation amount of the battery to be tested based on the detection image.

[0143] Step S42: Determine deformation information of the battery to be tested based on the deformation amount.

[0144] In the embodiment of the present application, the deformation amount of the battery to be tested is a criterion for measuring whether the deformation detection of the battery to be tested 500 is qualified, and the deformation information of the battery to be tested can be determined based on the deformation amount.

[0145] According to some embodiments of the present application, FIG13 is a control flow chart of a controller in some embodiments of the present application. Step S41 includes configuring the controller to:

[0146] Step S411: Identify the bottom surface of the battery to be tested in the detection image.

[0147] Step S412: determining the distance between the bottom surface and the battery cells in the battery to be tested.

[0148] Step S413: determining the deformation of the battery to be tested based on the distance.

[0149] During use, the bottom of the battery is more prone to bumps and deformation, so the bottom surface of the battery should be paid more attention during testing. The bottom of the battery under test has structural adhesive for connecting the battery cell and the box, so the bottom surface of the battery under test can be identified by the adhesive area of ​​the battery under test.

[0150] If the battery under test is deformed due to collision or impact, and a dent appears in the battery cell, the distance between the deformed battery cell and the bottom surface will increase. Therefore, the deformation amount of the battery under test can be determined based on the distance between the bottom surface and the battery cell.

[0151] The distance between the bottom surface and the battery cells can be automatically identified from the detection image. For example, the outline of the bottom surface of the battery under test is first identified, followed by the outline of the battery cells, and then the distance between the bottom surface and the battery cells is measured. The distance between the bottom surface and the battery cells in the undeformed state can be directly input into the controller 450, and the deformation of the battery under test can be calculated based on the difference between the two distances.

[0152] In the embodiment of the present application, if the internal structure of the battery 500 to be tested is deformed, the distance between the bottom surface and the battery cells in the battery to be tested will increase, and the deformation amount of the battery to be tested can be determined based on the distance between the bottom surface and the battery cells in the battery to be tested.

[0153] According to some embodiments of the present application, referring to FIG9 , the controller is further configured to:

[0154] Step S71: In response to the deformation amount being greater than a preset value, determining that the battery to be tested is unqualified.

[0155] In the embodiment of the present application, when the deformation amount is greater than the preset value, it indicates that the deformation of the battery 500 to be tested is too large, which will affect the stability of the battery 500 to be tested, and the battery 500 to be tested is determined to be unqualified.

[0156] According to some embodiments of the present application, referring to FIG9 , the controller is further configured to:

[0157] Step S72: In response to the deformation amount being less than or equal to the preset value, determining that the battery to be tested is qualified.

[0158] The controller 450 in the embodiment of the present application can control the complete detection of the battery 500 to be detected, or can detect a specific abnormal point according to the instruction, wherein the location of the abnormal point can be directly input into the controller 450 .

[0159] In some embodiments of the present application, the time required to detect the entire battery 500 is greater than or equal to 100 seconds and less than or equal to 150 seconds, and the time required to detect an abnormal point is greater than or equal to 20 milliseconds and less than or equal to 50 milliseconds.

[0160] According to some embodiments of the present application, the preset value is greater than or equal to 1 millimeter (mm) and less than or equal to 3 mm.

[0161] If the battery deformation is small, the impact on battery reliability is small. If the preset value is set too small, for example, less than 1 mm, too many batteries may be deemed unqualified, affecting battery production. If the preset value is set too large, for example, greater than 3 mm, the battery deformation will be large, affecting battery reliability. Setting the preset value to greater than or equal to 1 mm and less than or equal to 3 mm can improve battery reliability while ensuring battery production to a certain extent.

[0162] An embodiment of the present application provides a battery production device, comprising the detection device of any one of the above embodiments.

[0163] The battery production equipment includes a detection device 400, which can perform non-destructive testing on the battery 500 to be tested during the production process of the battery 500 to detect deformation of the battery 500 to be tested in time, thereby eliminating unqualified batteries 500 to be tested and improving the quality of the batteries 500 to be tested.

[0164] The detection device of the present application is further described below with reference to an exemplary embodiment.

[0165] The testing device 400 includes a scanning frame 410, a radiation source 420, a detector 430, and a supporting platform 440. Both the radiation source 420 and the detector 430 are connected to the scanning frame 410, with the detector 430 facing the radiation outlet of the radiation source 420. The supporting platform 440 is located between the radiation source 420 and the detector 430. The radiation source 420 and the detector 430 are rotatable about the same rotation axis O. The rotation direction of the radiation source 420 and the rotation direction of the detector 430 are the same, so that during rotation, the detector 430 remains opposite the radiation outlet of the radiation source 420. The supporting platform 440 is located between the radiation source 420 and the detector 430. The supporting platform 440 is used to place the battery 500 to be tested. The rotation angle α of the radiation source 420 satisfies the following requirement: α ≥ 180°. The supporting platform 440 is movably located between the radiation source 420 and the detector 430, and the movement direction of the supporting platform 440 is parallel to the extension direction of the rotation axis O.

[0166] The scanning frame 410 includes a base 411, a scanning ring 412 and a support wheel 413. The base 411 has a mounting groove 4111. At least a portion of the scanning ring 412 is located in the mounting groove 4111. The support wheel 413 is located in the mounting groove 4111 and is connected to the base 411. The outer ring of the scanning ring 412 is against the support wheel 413. The scanning ring 412 can rotate around the rotation axis O. The radiation source 420 and the detector 430 are both connected to the scanning ring 412, and the radiation source 420 and the detector 430 are located at opposite ends of one diameter of the scanning ring 412.

[0167] In the embodiment of the present application, the radiation source 420 may be an electron linear accelerator, for example, a 9 MeV small and lightweight electron linear accelerator. The detector 430 may be a linear array detector.

[0168] During testing, the battery 500 to be tested is placed on the supporting platform 440 and scanned step by step starting from one edge of the battery 500 to be tested. The scanning ring 412 drives the electron linear accelerator and the linear array detector to perform rotational scanning. The battery 500 to be tested moves forward step by step according to the set testing program until the entire battery 500 to be tested is scanned. The completed test image is then reconstructed in three dimensions and then sliced ​​at a certain distance to detect the deformation of the bottom of the battery cell inside the battery 500 to be tested. Alternatively, a specific position can be detected, such as the deformation position at the bottom of the outer shell of the battery 500 to be tested. The battery 500 to be tested is moved to the position to be tested for scanning, and the X-ray is aligned with the deformation position at the bottom of the outer shell of the battery 500 to be tested.

[0169] 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 detection device for detecting battery deformation, comprising: Scanning rack (410); A ray source (420) connected to the scanning frame (410); A detector (430) connected to the scanning frame (410), and the detector (430) is opposite to the emission port of the radiation source (420); A carrying platform (440) is located between the ray source (420) and the detector (430), and the carrying platform (440) is used to place the battery (500) to be tested; The ray source (420) and the detector (430) can rotate around the same rotation axis, and the rotation direction of the ray source (420) is the same as the rotation direction of the detector (430), so that during rotation, the detector (430) remains opposite to the emission port of the ray source (420), and the supporting platform (440) is located between the ray source (420) and the detector (430).

2. The detection device according to claim 1, wherein: The scanning frame (410) comprises: A base (411) having a mounting groove (4111); A scanning ring (412), at least partially located in the mounting groove (4111), and the scanning ring (412) can rotate around the rotation axis; The ray source (420) and the detector (430) are both connected to the scanning ring (412), and the ray source (420) and the detector (430) are located at opposite ends of one diameter of the scanning ring (412).

3. The detection device according to claim 2, wherein: The scanning frame (410) further includes: The support wheel (413) is located in the installation groove (4111), and the support wheel (413) is connected to the base (411), and the outer ring of the scanning ring (412) is against the support wheel (413).

4. The detection device according to any one of claims 1 to 3, wherein: The rotation angle α of the ray source (420) satisfies: α≥180°.

5. The detection device according to any one of claims 1 to 4, wherein: The carrying platform (440) is movably located between the ray source (420) and the detector (430), and the moving direction of the carrying platform (440) is parallel to the extending direction of the rotation axis.

6. The detection device according to any one of claims 1 to 5, wherein: The detection device also includes: A controller, the ray source is electrically connected and / or communicatively connected to the controller, and the detector is electrically connected and / or communicatively connected to the controller; Wherein, the controller is configured to: Controlling the ray source and the detector to rotate around the rotation axis; When the ray source rotates, the ray source is controlled to emit rays and pass through the battery to be tested located on the carrying platform and project to the detector; Acquiring a detection image of the battery to be tested based on the rays received by the detector; Based on the detection image, deformation information of the battery to be tested is determined.

7. The detection device according to claim 6, wherein: When the scanning frame includes a base and a scanning ring, controlling the radiation source and the detector to rotate around the rotation axis includes configuring the controller to: The scanning ring is controlled to rotate around the rotation axis.

8. The detection device according to claim 6 or 7, wherein: The battery to be tested comprises a bottom surface, the bottom surface has a glue coating area, and the controller is further configured as follows: The bottom surface of the battery to be tested is controlled to fit with the bearing surface of the bearing platform.

9. The detection device according to any one of claims 6 to 8, wherein: When the carrying platform is movable along the extending direction of the rotation axis, the controller is further configured to: The carrying platform is controlled to move along the extending direction of the rotation axis so that the carrying platform is located between the ray source and the detector.

10. The detection device according to any one of claims 6 to 9, wherein: Acquiring a detection image of the battery to be tested based on the rays received by the detector, comprising configuring the controller to: collecting a plurality of original images based on the rays received by the detector; Performing three-dimensional reconstruction on the multiple original images to obtain multiple cross-sectional detection images of the battery to be tested, wherein the cross sections of the multiple cross-sectional detection images are parallel and are sequentially arranged at intervals along the extension direction of the rotation axis; A detection image of the battery to be tested is determined based on the multiple cross-sectional detection images.

11. The detection device according to claim 10, wherein: Determining a detection image of the battery to be tested based on the multiple cross-sectional detection images includes configuring the controller to: Performing fuzzy processing on each of the plurality of cross-sectional detection images to obtain a plurality of first images; Performing convolution processing on each of the plurality of first images to obtain a plurality of second images; Each of the plurality of second images is enhanced to obtain a detection image of the battery to be tested.

12. The detection device according to claim 10 or 11, wherein: The distance between any two adjacent cross-sectional detection images among the multiple cross-sectional detection images is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

13. The detection device according to any one of claims 6 to 12, wherein: Determining deformation information of the battery to be tested based on the detection image includes configuring the controller to: Determining the deformation amount of the battery to be tested based on the detection image; Deformation information of the battery to be tested is determined based on the deformation amount.

14. The detection device according to claim 13, wherein: Based on the detection image, determining the deformation amount of the battery to be tested includes configuring the controller to: Identifying the bottom surface of the battery to be tested in the detection image; Determining the distance between the bottom surface and a battery cell in the battery to be tested; The deformation amount of the battery to be tested is determined based on the distance.

15. The detection device according to claim 13 or 14, wherein: The controller is also configured to: In response to the deformation amount being greater than a preset value, it is determined that the battery to be tested is unqualified.

16. The detection device according to claim 15, wherein: The preset value is greater than or equal to 1 mm and less than or equal to 3 mm.

17. A battery production device, comprising the detection device according to any one of claims 1 to 16.

Images