Detection device and battery production equipment

Abstract

The invention provides a detection device and battery production equipment, and belongs to the technical field of batteries. The detection device comprises a scanning frame, a radiation source, a detector and a bearing platform. The radiation source and the detector are both connected with the scanning frame, and the detector is opposite to an exit port of the radiation source. The bearing platform is located between the radiation source and the detector, the radiation source and the detector can rotate around the same rotating axis, and the rotating direction of the radiation source is the same as that of the detector, so that during rotation, the detector is kept opposite to an exit port of the radiation source, and the bearing platform is located between the radiation source and the detector; the bearing platform is used for placing a to-be-tested battery. The detection device provided by the embodiment of the invention can realize deformation detection of the to-be-detected battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a detection device and battery production equipment. 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 technology is an important factor in their development.

[0003] During the use of the battery, the battery may be bumped or hit, causing the battery to deform. The size of the external deformation of the battery can be directly measured by tools such as calipers, but it is impossible to know whether the battery is deformed inside, nor the size of the internal deformation. If the internal deformation of the battery is too large, it will affect the safety of the battery. Therefore, how to detect the internal deformation of the battery is an urgent problem to be solved. 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 detection device and a battery production device to detect the deformation inside the battery.

[0005] 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 emission port 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 emission port of the radiation source, and the carrying platform is located between the radiation source and the detector.

[0006] In the technical solution of the embodiment of the present application, when using the detection device provided by the embodiment of the present application, the battery to be tested can be placed on the carrying platform, and then the ray source emits rays through the battery to be tested on the carrying platform and projects them onto the detector to achieve scanning detection of the battery to be tested. At the same time, during the detection, the ray source and the detector are controlled to rotate around the rotation axis. During the rotation, the ray source and the detector can surround the battery to be tested for detection, making the detection more comprehensive and avoiding missed detection to a certain extent. After the battery to be tested is detected, the deformation of the battery to be tested can be obtained according to the detection image, so as to achieve comprehensive detection of the deformation of the battery to be tested.

[0007] In some embodiments, the scanning frame includes: a base having a mounting groove; a scanning ring at least partially located in the mounting groove, and the scanning ring can rotate around a rotation axis; wherein the ray source and the detector are both connected to the scanning ring, and the ray source and the detector are located at opposite ends of one diameter of the scanning ring. The scanning frame is set in the form of a base and a scanning ring, and the ray source and the detector are respectively arranged at opposite ends of one diameter of the scanning ring. When the scanning ring rotates, the relative positions of the ray source and the detector do not change, so that when rotating, the detector always remains relative to the exit port of the ray source. The rotation of the ray source and the detector is driven by controlling the rotation of the scanning ring. Since the relative positions of the ray source and the detector are fixed, it is only necessary to rotate the scanning circle, and there is no need to consider the rotation speed and direction of the ray source and the detector. However, the rotation speed and direction of the ray source and the detector need to be considered when controlling the ray source and the detector separately. That is, the embodiment of the present application controls the rotation of the ray source and the detector by controlling the scanning ring, which is more convenient.

[0008] In some embodiments, the scanning frame further includes: a support wheel, which is located in the mounting groove and connected to the base, and the outer ring of the scanning ring abuts against the support wheel. The support wheel separates the base from the scanning ring, and when the scanning ring rotates, the support wheel rolls, which can convert the sliding friction between the base and the scanning ring into rolling friction between the support wheel and the scanning ring, thereby reducing friction and making the rotation of the scanning ring smoother.

[0009] In some embodiments, the rotation angle α of the ray source satisfies: α≥180°. During detection, since the rays emitted by the ray source can penetrate the two opposite sides of the battery to be tested, the rotation angle α of the ray source is limited to 180°, so that every part of the battery to be tested can be detected as much as possible, which can avoid the possibility of missed detection to a certain extent and improve the accuracy of deformation detection.

[0010] In some embodiments, the carrying platform is movably located between the ray source and the detector, and the moving direction of the carrying platform is parallel to the extending direction of the rotation axis. The carrying platform is movably located between the ray source and the detector, and the continuous detection of the battery can be achieved by moving the carrying platform, thereby improving the detection efficiency.

[0011] In some embodiments, the detection device further includes: a controller, 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 around the rotation axis; when the radiation source rotates, control the radiation source to emit radiation and pass through the battery to be tested on the supporting platform to project to the detector; obtain a detection image of the battery to be tested based on the radiation received by the detector; and determine the deformation information of the battery to be tested based on the detection image. The method provided in the embodiments of the present application can detect the deformation of the battery to be tested and realize automatic detection.

[0012] In some embodiments, 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: control the scanning ring to rotate around the rotation axis. Since both the radiation source and the detector are connected to the scanning ring, controlling the scanning ring to rotate around the rotation axis can realize the rotation of the radiation source and the detector.

[0013] In some embodiments, the battery to be tested includes a bottom surface, and the bottom surface has a glue-coated area, and the controller is further configured to: control the bottom surface of the battery to be tested to fit with the bearing surface of the bearing platform. The bottom surface of the battery to be tested fits with the bearing surface of the bearing platform, so that the state of the battery to be tested during testing can be the same as the state loaded in the car, which can avoid unforeseen defects such as misalignment of the internal structure caused by the upright placement or rotation of the battery to be tested to a certain extent, affecting its reliability.

[0014] 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 located between the ray source and the detector. The carrying platform is located between the ray source and the detector so that the ray emitted by the ray source can pass through the battery to be tested on the carrying platform and project onto the detector.

[0015] In some embodiments, obtaining a test image of the battery to be tested based on the rays received by the detector includes configuring the controller to: collect multiple original images based on the rays received by the detector; perform three-dimensional reconstruction on the multiple original images to obtain multiple cross-sectional test images of the battery to be tested, wherein the cross sections of the multiple cross-sectional test images are parallel and arranged in sequence along the extension direction of the rotation axis; and determine the test image of the battery to be tested based on the multiple cross-sectional test images. The above method can obtain a clearer test image and more easily identify the deformation of the battery to be tested.

[0016] In some embodiments, determining the test image of the battery to be tested based on multiple cross-sectional test images includes configuring the controller to: perform blur processing on 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; perform enhancement processing on each of the multiple second images to obtain the test image of the battery to be tested. By processing the image using the above method, the contour edge of the battery to be tested in the test image can be more easily identified to show the deformation of the battery to be tested.

[0017] 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 range set in the embodiments 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.

[0018] In some embodiments, the deformation information of the battery to be tested is determined based on the detection image, including configuring the controller to: determine the deformation amount of the battery to be tested based on the detection image; and determine the deformation information of the battery to be tested based on the deformation amount. The deformation amount of the battery to be tested is a standard for measuring whether the deformation detection of the battery to be tested is qualified, and the deformation information of the battery to be tested can be determined based on the deformation amount.

[0019] In some embodiments, based on the detection image, the deformation amount of the battery to be tested is determined, including configuring the controller to: identify the bottom surface of the battery to be tested in the detection image; determine the distance between the bottom surface and the battery cells in the battery to be tested; and determine the deformation amount of the battery to be tested based on the distance. If the internal deformation of the battery to be tested will increase the distance between the bottom surface and the battery cells in the battery to be tested, 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.

[0020] In some embodiments, the controller is further configured to: in response to the deformation amount being greater than a preset value, determine that the battery under test is unqualified. When the deformation amount is greater than the preset value, it means 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.

[0021] 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 the battery reliability is small. If the preset value is set too small, for example, less than 1 mm, too many batteries may be identified as unqualified, affecting the battery yield. If the preset value is set too large, for example, greater than 3 mm, the deformation in the battery will be large, affecting the battery reliability. Setting the preset value to be greater than or equal to 1 mm and less than or equal to 3 mm can improve the reliability of the battery while ensuring the battery yield to a certain extent.

[0022] An embodiment of the second aspect of the present application provides a battery production device, which includes the detection device in the above embodiment.

[0023] 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

[0024] 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.

[0025] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0026] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0027] Figure 3 A front view of a detection device according to some embodiments of the present application;

[0028] Figure 4 This is a front view of the support wheel of some embodiments of the present application;

[0029] Figure 5 A front view of the detection device in some embodiments of the present application in another state;

[0030] Figure 6 A front view of the detection device in some embodiments of the present application in another state;

[0031] Figure 7 A block diagram of a detection device according to some embodiments of the present application;

[0032] Figure 8A control flow chart of a controller in some embodiments of the present application;

[0033] Fig. 9 A control flow chart of a controller in some embodiments of the present application;

[0034] Fig.10 A control flow chart of a controller in some embodiments of the present application;

[0035] Fig.11 A control flow chart of a controller in some embodiments of the present application;

[0036] Fig.12 A control flow chart of a controller in some embodiments of the present application;

[0037] Fig.13 This is a control flow chart of a controller according to some embodiments of the present application.

[0038] Description of reference numerals:

[0039] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, housing; 11, first part; 12, second part; 20, battery cell;

[0040] 400, detection device; 410, scanning frame; 420, radiation source; 430, detector; 440, carrying platform; 450, controller; 411, base; 412, scanning ring; 413, support wheel; 4111, mounting groove; 4131, support block; 4132, roller; 500, battery to be tested. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[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. 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.

[0048] 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.

[0049] 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.

[0050] During use, the battery may be bumped or hit, causing external deformation of the battery. If the deformation is too large, the internal deformation of the battery may also occur. The deformation of the battery's exterior can be observed directly, 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 observed directly, and the size of the internal deformation of the battery cannot be known. 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 it is impossible to know the internal deformation of the battery, if the battery is discarded directly, 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 a ray source pass through the battery to be tested on the carrying platform and are projected onto a 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 while rotating, thereby achieving comprehensive detection of battery deformation.

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

[0053] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and 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 , Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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 not only serve as an operating power source for the vehicle 1000, but also serve 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 , Figure 2 An exploded diagram of a battery provided for some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is contained in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[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 mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0059] Each battery cell 20 may be a secondary battery or a primary battery, or 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] The present application embodiment provides a detection device for detecting battery deformation. Figure 3 This is a front view of the detection device of some embodiments of the present application. Figure 3 , the detection device 400 includes a scanning frame 410, a radiation source 420, a detector 430 and a carrying platform 440. The radiation source 420 and the detector 430 are both connected to the scanning frame 410, and the detector 430 is opposite to the emission port of the radiation source 420. The carrying platform 440 is located between the radiation source 420 and the detector 430, wherein the radiation source 420 and the detector 430 can rotate around the same rotation axis O, and the rotation direction of the radiation 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 radiation source 420, and the carrying platform 440 is located between the radiation source 420 and the detector 430. For the convenience of explanation, Figure 3 A battery 500 to be tested is also shown, and the carrying platform 440 is used to place the battery 500 to be tested.

[0061] The scanning frame 410 can be any component used to install the ray source 420 and the detector 430 to improve the stability of the ray source 420 and the detector 430. It can be used to fix the ray source 420 and the detector 430. When the ray source 420 and the detector 430 are installed on the scanning frame 410, the detector 430 can be opposite to the emission port of the ray source 420, so that the rays emitted by the ray source 420 can pass through the battery 500 to be tested on the supporting platform 440 and projected onto the detector 430, thereby realizing the detection of the battery 500 to be tested.

[0062] The ray source 420 is a device for emitting detection rays, and mainly includes a ray tube, a cooling system, and a corresponding control system. The detection rays can be X-rays or other rays, and the ray tube can emit corresponding detection rays, such as an X-ray tube and a gamma-ray tube. In one example, the ray source 420 is an electron linear accelerator, and the detection rays it emits are X-rays. When the detection rays emitted by the ray source 420 pass through the battery 500 to be tested, due to the difference in thickness or material of different areas of the battery 500 to be tested, the absorption rate of the X-rays is different, so detection can be performed through the different absorption degrees of the X-rays.

[0063] The rays emitted by the ray source 420 are all penetrating, and the attenuation degree of the rays by materials of different thicknesses is different, so that the amount of rays detected by the detector 430 is different. There is a layer of luminescent material inside the detector 430, which can emit visible light signals under the excitation of 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, which represents the image with light and dark contrast on the image. After the rays pass through the detected object, there will be a certain attenuation. The more rays that pass through, the more luminescent signals the photosensitive material will emit, and the brighter the area will be on the final image. On the contrary, the fewer rays that pass through, the darker the area on the image. The detector 430 can be a flat panel detector or a linear array detector, which is not limited in the 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 result.

[0067] In the 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 ray source 420 and the detector 430 rotate, it is necessary to ensure that the carrying platform 440 is located between the ray source 420 and the detector 430, so that during detection, the rays emitted by the ray source 420 can pass through the battery 500 to be tested on the carrying platform 440 and project onto the detector 430. Figure 3 The rotation axis O can be located on the bearing surface of the bearing platform 440, so that when the ray source 420 and the detector 430 rotate, the bearing platform 440 is always located between the ray source 420 and the detector 430. The ray source 420 and the detector 430 can rotate clockwise or counterclockwise.

[0069] The rotation axis O is a virtual line, not a real line. Figure 3 In the figure, the rotation axis O is perpendicular to the plane of the figure, so Figure 3 In the figure, 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 carrying platform 440, and then the ray source 420 emits rays through the battery 500 to be tested on the carrying platform 440 and projects them onto the detector 430, so as to achieve 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 be around the battery 500 to be tested for detection, so that the detection is more comprehensive and the situation of missed detection can be avoided to a certain extent. After the battery 500 to be tested is detected, the deformation of the battery 500 to be tested can be obtained according to the detection image, so as to achieve 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, see Figure 3 The scanning frame 410 includes a base 411 and a scanning ring 412, the base 411 has a mounting groove 4111, at least a portion of the scanning ring 412 is located in the mounting groove 4111, and the scanning ring 412 can rotate around the rotation axis O, wherein 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.

[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] like Figure 3 As shown, the cross-section of the mounting groove 4111 is hexagonal and is distributed in a stacked shape. 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 the embodiment of the present application, the scanning frame 410 is set in the form of a base 411 and a scanning ring 412, and the ray source 420 and the 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 ray source 420 and the detector 430 do not change, so that when rotating, the detector 430 always remains relative to the exit of the ray source 420. The ray source 420 and the detector 430 are driven to rotate by controlling the rotation of the scanning ring 412. Since the relative positions of the ray 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 ray source 420 and the detector 430 do not need to be considered. However, the rotation speed and direction of the ray source 420 and the detector 430 need to be considered when the ray source 420 and the detector 430 are controlled separately. That is, the embodiment of the present application controls the rotation of the ray 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, see Figure 3 The scanning frame 410 also includes a supporting wheel 413 , which is located in the mounting groove 4111 , and is connected to the base 411 , and the outer ring of the scanning ring 412 abuts against the supporting wheel 413 .

[0078] In the 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 may be directly bonded to the inner wall of the mounting groove 4111 , or the support wheel 413 may 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 according to the requirements, such as Figure 3In the embodiment, a support wheel 413 is arranged on each of the four inner walls of the mounting groove 4111 and is also symmetrically distributed, 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 other settings, 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, and the sliding friction between the base 411 and the scanning ring 412 can be converted 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, Figure 4 The front view of the support wheel of some embodiments of the present application. The support wheel 413 includes a support block 4131 and a roller 4132, a portion of the roller 4132 is located inside the support block 4131, a portion of the roller 4132 extends outside the support block 4131, and the roller 4132 is rollable, 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 only include a roller, a groove is provided on the side wall of the mounting groove 4111, part of the roller is located in the groove, the other part of the roller extends out of the groove, and the roller is rotatable, and the roller abuts against the outer ring of the scanning ring 412. That is, the support block 4131 is directly omitted, making the structure of the detection device simpler.

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

[0085] Figure 5 This is a front view of the detection device of some embodiments of the present application in another state. Figure 6 This is a front view of the detection device in some embodiments of the present application in another state. Figure 3 The scanning ring 412 in the detection device shown in the figure will be rotated by a certain angle β to obtain Figure 5 The detection device shown in the figure, after the scanning ring 412 rotates a certain angle along the rotation direction A, the Figure 6 The detection device shown, wherein Figure 3 The scanning ring 412 in the detection device shown in the figure rotates a total of α to obtain Figure 6 It should be noted that in Figure 5 and Figure 6 In order to make the rotation angle of the detection device clear, Figure 5 and Figure 6 The carrying platform 440 and the battery to be tested 500 are omitted.

[0086] In the embodiment of the present application, since the scanning ring 412 can rotate back and forth, the ray source 420 can rotate along two opposite rotation 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, and 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°. Figure 3 , Figure 5 and Figure 6 For example, assuming α = 180°, Figure 3 is the state before the detection starts. Figure 6 is the maximum angle of rotation of the scanning ring 412 during the detection process. At this time, the maximum angle is equal to 80°, but Figure 6 The scanning ring 412 in the detection device shown can still rotate in the rotation direction A. Figure 5 It is an intermediate state, β<180°. During detection, the rotation angle of a certain state of the scanning ring 412 may be less than 180°.

[0088] The detection device of the embodiment of the present application detects the deformation of the battery 500 to be tested, and the deformation of the battery 500 to be tested may exist in any part of the battery 500 to be tested. During the detection, since the rays emitted by the ray source 420 can penetrate the two opposite sides of the battery 500 to be tested, the rotation angle α of the ray source 420 is limited to ≥ 180°, so that every part of the battery 500 to be tested can be detected as much as possible, which can avoid the possibility of missed detection to a certain extent and improve 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] Exemplarily, when the carrying platform 440 is an annular guide rail, the upper tray on the annular guide rail may be made of carbon fiber material, which can reduce the impact on detection.

[0092] The detection device provided in the embodiment of the present application can be placed after the battery manufacturing process is completed, and the manufactured battery is directly transported to the space between the radiation source 420 and the detector 430 through the carrying platform 440 for detection, and after the detection is completed, it is transported to the next link through the carrying platform 440. In other implementations, the battery 500 to be tested can be moved to the carrying platform 440 by 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 will not interfere with the scanning ring 412 .

[0094] The carrying platform 440 in the embodiment of the present application can be movably located between the radiation source 420 and the detector 430 , and continuous detection of the battery can be achieved by moving the carrying platform 440 , thereby improving the detection efficiency.

[0095] According to some embodiments of the present application, Figure 7 The block diagram of the detection device of some embodiments of the present application. The detection device also includes a controller 450, the radiation source 420 is electrically connected and / or communicatively connected to the controller 450, and the detector 430 is electrically connected and / or communicatively connected to the controller 450.

[0096] Figure 8 This is a control flow chart of the controller of some embodiments of the present application. Figure 8 , the controller 450 is configured to:

[0097] Step S10: Control 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 and pass through the battery to be tested on the carrying platform to 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 the 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 the detection starts to reduce the error of the detection image. For example, the detector 430 needs to be calibrated before the formal operation. Before calibration, it is necessary to ensure that there is no debris on the exit port of the ray source 420 and the surface of the detector 430, and there is no obstruction between the ray source 420 and the detector 430. It is required that the ray fully covers the receiving surface of the detector 430, and the grayscale value of the imaging of the detection device at this time can be adjusted to the calibration 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, and 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 achieving 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 to be tested 500 includes a bottom surface, the bottom surface having a glue-coated area, Fig. 9 This is a control flow chart of the controller of some embodiments of the present application. Fig. 9 , the controller 450 is further configured to:

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

[0113] The shape of the battery 500 to be tested is similar to a rectangular parallelepiped, and the battery 500 to be tested has two large faces arranged opposite to each other, and four side faces connecting the two large faces. The large faces are the top face and the bottom face of the battery to be tested, wherein the top face and the bottom face are respectively located in the first part 11 and the second part 12 of the above-mentioned box 10. The bottom face has a glue-coated area, and the glue-coated area has glue for bonding the battery cells, and the bottom face of the battery 500 to be tested can be identified by the glue-coated area. For example, if the bottom face is located in the second part 12, then the second part 12 has a glue-coated area.

[0114] In an embodiment of the present application, the bottom surface of the battery 500 to be tested is in contact with the bearing surface of the bearing 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 avoid unforeseen defects such as misalignment of the internal structure due to 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 can move along the extension direction of the rotation axis O, see Fig. 9 , the controller is also configured to:

[0116] Step S60: Control 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, Fig.10 This is a control flow chart of the controller of some embodiments of the present application. Step S30 includes configuring the controller to:

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

[0121] Step S32: reconstructing the multiple original images in three dimensions to obtain multiple cross-sectional inspection images of the battery to be tested, wherein the cross sections of the multiple cross-sectional inspection images are parallel and are arranged in sequence and at intervals along the extension direction of the rotation axis.

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

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

[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 to be tested during use is generally in the form of a pit, the detection of the deformation is mainly to measure the depth of the pit. It is not easy to measure the deformation of the battery 500 to be tested in a three-dimensional image, that is, it is impossible to determine whether the deformation of the battery to be tested is too large. The cross-sectional detection diagram of the battery to be tested is determined based on the three-dimensional image. The cross-sectional detection diagram is a two-dimensional image, and it is easier to identify the depth of the pit, that is, the deformation of the battery to be tested, in a two-dimensional image.

[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 bearing surface of the bearing platform 440 during inspection, the rotation axis O is located on the bearing surface of the bearing platform 440, and the cross-sections where the multiple cross-sectional inspection images are located 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 the information of 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 embodiments 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 to be tested 500 collected can be set according to the demand. The more the number of original images collected, the more accurate the image of the battery to be tested obtained by three-dimensional reconstruction, and the more accurate the detection result.

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

[0130] According to some embodiments of the present application, Fig.11 This is a control flow chart of the controller of 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, blur processing is performed by removing non-essential features in the cross-sectional inspection image, such as noise, interference lines, etc., and 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 edge of the battery cell 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 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.

[0139] If the battery 500 to be tested has a pit, the depth (deformation) of not every location in the pit is the same. After the three-dimensional image of the battery to be tested is divided 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 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 range set in the embodiments 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.

[0141] According to some embodiments of the present application, Fig.12 This is a control flow chart of the controller of 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 according to the deformation amount.

[0145] According to some embodiments of the present application, Fig.13 This is a control flow chart of the controller of some embodiments of the present application. Step S41, including 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 amount of the battery to be tested based on the distance.

[0149] 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 of the battery during testing. The bottom of the battery to be tested has structural glue, which is used to connect the battery cell and the box, so the bottom of the battery to be tested can be identified through the glue-coated area of ​​the battery to be tested.

[0150] If the battery to be tested is deformed due to collision or impact, and a dent appears in the battery cell, the distance between the battery cell at the deformed position and the bottom surface will increase. Therefore, the deformation amount of the battery to be tested 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 cell can be automatically identified through the detection image. For example, the contour of the bottom surface of the battery to be tested is first identified, and then the contour of the battery cell is identified, and then the distance between the bottom surface of the battery to be tested and the battery cell is measured. The distance between the bottom surface and the battery cell in the undeformed state can be directly input into the controller 450, and the deformation amount of the battery to be tested can be obtained based on the difference between the two distances.

[0152] In the embodiment of the present application, if the internal part 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, see Fig. 9 , the controller is also 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 means 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 it is determined that the battery 500 to be tested is unqualified.

[0156] According to some embodiments of the present application, see Fig. 9 , the controller is also configured to:

[0157] Step S72: In response to the deformation amount being less than or equal to a 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 battery 500 to be tested to be fully tested, or can detect a specific abnormal point according to the instruction, wherein the position of the abnormal point can be directly input into the controller 450 .

[0159] In some embodiments of the present application, the detection time for the entire battery 500 to be tested is greater than or equal to 100 seconds and less than or equal to 150 seconds, and the detection time for 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 millimeters.

[0161] If the deformation of the battery is small, the impact on the battery reliability is small. If the preset value is set too small, for example, less than 1 mm, too many batteries may be identified as unqualified, affecting the 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 the battery reliability. Setting the preset value to be greater than or equal to 1 mm and less than or equal to 3 mm can improve the reliability of the battery while ensuring the 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 be tested, and timely detect the deformation of the battery 500 to be tested, so as to eliminate unqualified batteries 500 to be tested and improve the quality of the batteries 500 to be tested.

[0164] The detection device of the present application is further described below in conjunction with a specific embodiment.

[0165] The detection device 400 includes a scanning frame 410, a radiation source 420, a detector 430 and a carrying platform 440. The radiation source 420 and the detector 430 are both connected to the scanning frame 410, and the detector 430 is opposite to the emission port of the radiation source 420. The carrying platform 440 is located between the radiation source 420 and the detector 430, wherein the radiation source 420 and the detector 430 can rotate around the same rotation axis O, and the rotation direction of the radiation source 420 is the same as the rotation direction of the detector 430, so that when rotating, the detector 430 remains opposite to the emission port of the radiation source 420, and the carrying platform 440 is located between the radiation source 420 and the detector 430. The carrying platform 440 is used to place the battery 500 to be tested. The rotation angle α of the radiation source 420 satisfies: α≥180°. The carrying platform 440 is movably located between the radiation source 420 and the detector 430, and the moving direction of the carrying 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 supporting 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 supporting wheel 413 is located in the mounting groove 4111, and the supporting wheel 413 is connected to the base 411. The outer ring of the scanning ring 412 is against the supporting wheel 413, and the scanning ring 412 can rotate around the rotation axis O, wherein 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 ray source 420 may be an electron linear accelerator, for example, a 9MeV small and lightweight electron linear accelerator. The detector 430 may be a linear array detector.

[0168] During the test, the battery 500 to be tested is placed on the carrying platform 440, and the scan is gradually started from the edge of one side 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, and the battery 500 to be tested moves forward step by step according to the set detection 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, and the battery 500 to be tested is moved to the position to be tested for scanning, and the X-ray is aimed at 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 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 detection device for detecting battery deformation, characterized in that: include: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: Determining deformation information of the battery to be tested based on the detection image includes configuring the controller to: Based on the detection image, determining the deformation amount of the battery to be tested; Deformation information of the battery to be tested is determined based on the deformation amount.

14. The detection device according to claim 13, characterized in that: 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, characterized in that: 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, characterized in that: The preset value is greater than or equal to 1 mm and less than or equal to 3 mm.

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

Images