Battery defect detection equipment, method and device

Abstract

The invention provides battery defect detection equipment, method and device, and belongs to the technical field of batteries. The battery defect detection equipment comprises a radiation source, a detector and a bearing part located between the radiation source and the detector, and a battery to be detected is configured to be located on the bearing surface of the bearing part. The battery defect detection equipment further comprises a rotating mechanism which is configured to be used for rotating the bearing part along a preset rotating shaft, or the rotating mechanism is configured to be used for rotating the ray source and the detector along the preset rotating shaft, so that the optical axis of rays emitted by the ray source is obliquely projected to the surface of the to-be-detected battery. According to the requirements of different detection scenes, at least the included angle between the end face of the battery to be detected and the plane where the detector is located can be flexibly adjusted, and all structures in the battery in imaging can be clearly shot at the same time to a certain extent.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery defect detection device, method and apparatus. 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 production process, batteries will have various internal defects, which will affect the quality and safety of the batteries. While improving the efficiency of battery production, manufacturers have also conducted more comprehensive inspections on defects that may occur during the battery manufacturing process to ensure the safety of products entering the market. In related technologies, when inspecting the internal defects of batteries, there is a problem of unclear imaging inside the battery, which makes it impossible to identify the defects inside the battery, affecting the reliability of the battery. 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 purpose of the present application is to provide a battery defect detection device, method and apparatus to improve / mitigate / solve the problem of internal battery imaging clarity during detection.

[0005] An embodiment of the first aspect of the present application provides a battery defect detection device, including a radiation source, a detector, and a carrying component located between the radiation source and the detector, the carrying component is used to carry a battery to be tested, the carrying component includes a carrying surface, and the battery to be tested is configured to be located on the carrying surface.

[0006] The battery defect detection equipment also includes a rotating mechanism, which is configured to rotate the supporting component along a preset axis, or the rotating mechanism is configured to rotate the radiation source and the detector along a preset axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested, and the detector is configured to receive the radiation that penetrates the battery to be tested to obtain an initial image, and the initial image is used to perform defect detection on the battery to be tested.

[0007] In the technical solution of the embodiment of the present application, the battery can be inspected by means of a radiation source, a detector and a supporting component. By setting a rotating mechanism, the relative angle between the battery to be tested and the radiation emitted by the radiation source can be flexibly adjusted according to the needs of different detection scenarios, which can reduce the obstruction between the internal structures of the battery to a certain extent, and enable the various structures inside the battery to be clearly photographed simultaneously in the imaging to a certain extent. In some examples, at least the cathode ear and the anode ear can be clearly photographed simultaneously in the imaging to a certain extent.

[0008] The rotating mechanism is configured to rotate the supporting component along a preset rotation axis, or the rotating mechanism is configured to rotate the radiation source and the detector along a preset rotation axis. Based on the above two adjustment methods, adjusting at least the angle between the end face of the battery to be tested and the plane where the detector is located can improve to a certain extent the problem of unclear imaging of some internal structures of the battery caused by the fixed imaging angle, improve the quality of the detected image, and thereby improve the accuracy of image recognition to a certain extent.

[0009] In some embodiments, the battery defect detection device further includes a defect detection unit connected to the detector, and the defect detection unit is configured to perform defect detection on the battery to be tested based on the electrical signal or initial image of the detector. By setting the defect detection unit to receive the electrical signal of the detector or the initial image indirectly generated, and outputting the detection result of the battery to be tested, automatic detection of internal defects of the battery to be tested can be achieved, thereby improving the automation level and detection efficiency of the battery detection equipment.

[0010] In some embodiments, the battery to be tested includes an end face, which is a plane where the battery end cap is located; along a direction perpendicular to the bearing surface, the projection of the middle area of ​​the end face of the battery to be tested on the bearing surface is located in the middle area of ​​the bearing surface; the rays emitted by the ray source are configured to be at least obliquely projected to the middle area of ​​the end face of the battery to be tested. Since the projection of the center area of ​​the end face of the battery to be tested on the bearing surface is located in the center area of ​​the bearing surface, when the rays emitted by the ray source are projected to the battery to be tested, the rays can be shot from the middle area of ​​the battery to be tested to the edge area of ​​the battery to be tested, which reduces the obstruction of the imaging of the tab by the battery cell top cover adapter to a certain extent, making the imaging of the tab morphology clearer, thereby improving the accuracy of image recognition to a certain extent.

[0011] In some embodiments, the preset rotation axis is perpendicular to the bearing surface. When the bearing component is rotated along the preset rotation axis, or when the radiation source and the detector are rotated along the preset rotation axis, they are rotated within the bearing surface, which can reduce the shielding of the radiation by the bearing surface to a certain extent and increase the stability of the rotation.

[0012] In some embodiments, the preset rotating shaft is at least disposed through the middle area of ​​the carrying surface. During the rotation process, the optical axis of the ray emitted by the ray source can be controlled to a certain extent to always be projected obliquely to the middle area of ​​the carrying surface, that is, to the central area of ​​the surface of the battery to be tested, thereby improving the consistency and stability of the detection.

[0013] In some embodiments, the angle α between the end face of the battery to be tested and the plane where the detector is located satisfies: 0°≤α≤45°. By adjusting a reasonable rotation angle, the imaging between the various structures inside the battery can be made clearer, and the detection accuracy of the two tab shapes inside the battery can be improved to at least a certain extent.

[0014] In some embodiments, the battery defect detection device further includes a first adjustment structure, the first adjustment mechanism is connected to the bearing component, and the first adjustment mechanism is configured to drive the bearing component to move to adjust the distance between the bearing component and the radiation source. According to the principle of similar triangles, the magnification of the battery defect detection device is related to the distance between the bearing component and the radiation source. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the detection image may not be clear enough, affecting the detection effect.

[0015] Therefore, the magnification of the detection device can be controlled by adjusting the distance between the bearing component and the radiation source, so that the initial image can be magnified and the imaging quality can be adjusted to a certain extent.

[0016] At the same time, the size of the radiation surface irradiated on the surface of the battery to be tested can also be controlled. When the distance between the ray source and the carrier component is small, the radiation surface of the ray on the surface of the battery to be tested is also relatively small, and only part of the battery is irradiated by the ray. Therefore, the detection effect of local details can be improved to a certain extent; when the distance between the ray source and the carrier component increases, the radiation surface of the ray on the surface of the battery to be tested is also relatively increased, thereby covering a larger detection area and reducing the possibility of missed detection to a certain extent.

[0017] In some embodiments, the battery defect detection device also includes a second adjustment structure, which is connected to the radiation source and configured to drive the radiation source to move to adjust the distance between the radiation source and the detector, or the second adjustment mechanism is connected to the detector and configured to drive the detector to move to adjust the distance between the radiation source and the detector.

[0018] By adjusting the distance between the ray source and the detector, it is possible to adapt to different types of battery detection. At the same time, the magnification of the battery defect detection equipment is also related to the distance between the ray source and the detector. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear enough, affecting the detection effect. Therefore, the magnification of the battery defect detection equipment can be controlled by adjusting the distance between the ray source and the detector, so that the initial image can be magnified while the imaging quality can be adjusted to a certain extent.

[0019] In some embodiments, the rated voltage V of the radiation source satisfies: 130 kV ≤ V ≤ 150 kV, and / or the rated current I of the radiation source satisfies: I ≤ 500 μA. By setting the value range of the voltage and / or current, the radiation emitted by the radiation source can penetrate the battery tab to achieve detection, and at the same time, there will be no overexposure phenomenon, which affects the accuracy of the detection.

[0020] An embodiment of the second aspect of the present application provides a method for performing battery defect detection using a battery defect detection device of any one of the above embodiments, comprising: in response to a battery to be tested being placed on a supporting component, rotating the supporting component along a preset rotation axis, or rotating a radiation source and a detector along a preset rotation axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested; and obtaining an initial image obtained by the detector by receiving radiation that penetrates the battery to be tested, the initial image being used for defect detection of the battery to be tested.

[0021] According to the needs of different detection scenarios, the relative angle between the battery to be tested and the rays emitted by the ray source can be flexibly adjusted, which can reduce the occlusion between the internal structures of the battery to a certain extent, and to a certain extent, make the various internal structures of the battery in the imaging be clearly photographed at the same time. It can improve the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle to a certain extent, improve the quality of the detection image, and thus improve the accuracy of image recognition to a certain extent.

[0022] In some embodiments, the optical axis of the radiation emitted by the radiation source is adjusted to be obliquely projected onto the surface of the battery to be tested so as to form at least an angle between the end face of the battery to be tested and the plane where the detector is located, and the angle is configured to satisfy the projection of the cathode ear of the battery to be tested on the plane where the anode ear is located based on the radiation projected onto the cathode ear, and the projection is staggered with the area where the anode ear is located or the area of ​​the overlapping area between the two is smaller than a preset value.

[0023] By adjusting the angle between the end face of the battery to be tested and the plane where the detector is located, the cathode ear and the anode ear can be at least partially offset in the imaging direction, thereby reducing the occlusion of one by the other, thereby improving the imaging clarity of the two to a certain extent, and then providing image recognition accuracy to improve the sampling efficiency of the detection image.

[0024] In some embodiments, the surface of the battery to be tested includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery to be tested. The side surface of the battery to be tested is also the large surface of the battery to be tested, and the preset rotation axis is perpendicular to the large surface of the battery to be tested. During the rotation process, the large surface of the battery is always in the same plane, which improves the imaging consistency and stability after rotation, thereby improving the detection effect.

[0025] In some embodiments, the optical axis of the ray emitted by the ray source is projected obliquely to the middle area of ​​the end face of the battery to be tested. Since the projection of the central area of ​​the end face of the battery to be tested on the supporting surface is located in the central area of ​​the supporting surface, that is, the central area of ​​the large surface of the battery to be tested is located in the central area of ​​the supporting surface. Therefore, when the ray emitted by the ray source is projected to the middle area of ​​the end face of the battery to be tested, the ray can hit the edge area of ​​the battery from the middle area of ​​the end face of the battery, thereby reducing the obstruction of the imaging of the pole ear by the battery cell top cover adapter to a certain extent, making the imaging of the pole ear morphology clearer, thereby improving the accuracy of image recognition to a certain extent.

[0026] In some embodiments, the distance between the radiation source and the detector and / or the distance between the supporting component and the radiation source is adjusted in a direction perpendicular to the plane of the detector.

[0027] According to the principle of similar triangles, the magnification of the battery defect detection equipment is related to the distance between the ray source and the detector and / or the distance between the bearing component and the ray source. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear enough, affecting the detection effect. Therefore, the magnification of the detection equipment can be controlled by adjusting the distance between the ray source and the detector and / or the distance between the bearing component and the ray source, so that the initial image can be magnified and the imaging quality can be adjusted to a certain extent.

[0028] At the same time, the size of the radiation surface irradiated on the surface of the battery to be tested can also be controlled. When the distance between the ray source and the carrier component is small, the radiation surface of the ray on the surface of the battery to be tested is also relatively small, and only part of the battery area is irradiated, which can improve the detection effect of local details to a certain extent; when the distance between the ray source and the carrier component increases, the radiation surface of the ray on the surface of the battery to be tested is also relatively increased, thereby covering a larger detection area and reducing the possibility of missed detection to a certain extent.

[0029] In some embodiments, in response to the test result of the battery to be tested being unqualified, the battery to be tested is discarded or retested.

[0030] An embodiment of the third aspect of the present application provides a battery defect detection device, which includes an adjustment module and an acquisition module, wherein the adjustment module is configured to adjust the supporting component along a preset rotation axis in response to the battery to be tested being placed on the supporting component, or to adjust the radiation source and the detector along the preset rotation axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested; the acquisition module is configured to acquire an initial image obtained by the detector by receiving radiation that penetrates the battery to be tested, and the initial image is used for defect detection of the battery to be tested.

[0031] According to the needs of different detection scenarios, the relative angle between the battery to be tested and the rays emitted by the ray source can be flexibly adjusted, which can reduce the occlusion between the internal structures of the battery to a certain extent, and to a certain extent, make the various internal structures of the battery in the imaging be clearly photographed at the same time. It can improve the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle to a certain extent, improve the quality of the detection image, and thus improve the accuracy of image recognition to a certain extent.

[0032] In some embodiments, the battery defect detection device further includes a detection module, which is configured to perform defect detection on the battery to be tested based on the initial image. By setting the detection module to receive the initial image generated by the detector and recognize the detected image to output the detection result of the battery to be tested, the internal defects of the battery to be tested can be detected, thereby improving the automation and detection efficiency of the battery defect detection device.

[0033] An embodiment of the fourth aspect of the present application provides an electronic device, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery defect detection method of any one of the above embodiments.

[0034] An embodiment of the fifth aspect of the present application provides a battery defect detection device, which includes the electronic device in the above embodiment.

[0035] An embodiment of the sixth aspect of the present application provides a computer-readable storage medium storing a computer program, which implements the battery defect detection method of any one of the above embodiments when the computer program is executed by a processor.

[0036] 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

[0037] 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.

[0038] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0039] Figure 2A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0040] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0041] Figure 4 A schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application;

[0042] Figure 5 A schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application;

[0043] Figure 6 A schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application;

[0044] Figure 7 A schematic flow chart of a method for battery defect detection provided in some embodiments of the present application;

[0045] Figure 8 A structural block diagram of a battery defect detection device 500 provided in some embodiments of the present application;

[0046] Fig. 9 A structural block diagram of an electronic device 600 provided in some embodiments of the present application;

[0047] Fig.10 A detection image of a battery to be tested provided in some embodiments of the present application;

[0048] Fig.11 Detection images of batteries to be tested provided in some embodiments of the present application. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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).

[0055] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships 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 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.

[0056] 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 ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] 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.

[0058] The applicant has noticed that during the production and use of batteries, defects may occur in the batteries. For example, during the production of batteries, defects such as folding of the tabs or breaking of the tabs may occur. It is necessary to remove the defective batteries to avoid affecting the reliability of the batteries to a certain extent. The distance between the cathode and cathode plates and the misalignment of the cathode and cathode plates inside the battery are also important factors affecting the safety performance of the battery. Regarding the distance between the cathode and cathode plates: during the charging and discharging process of the lithium battery, when the distance between the cathode and cathode plates is large, the lithium ions cannot be fully embedded in the anode channel, resulting in the accumulation of some lithium ions and the problem of lithium precipitation, which has a greater safety risk. Therefore, it is required that the distance between the cathode and cathode plates in the battery should not be too large. Regarding the misalignment of the cathode and cathode plates: during the charging and discharging process of the lithium battery, lithium ions will repeatedly deintercalate between the cathode and cathode plates, but when lithium ions are not embedded in enough anode channels after being extracted from the cathode, it is easy to cause lithium ion accumulation and lithium precipitation, causing certain product safety risks. Therefore, it is necessary to ensure that the cathode plate is within the coating range of the anode as a whole, that is, to ensure that the anode exceeds the cathode, that is, the misalignment of the cathode and cathode is greater than 0. Therefore, it is necessary to detect the internal spacing of the battery and the misalignment of the anode and cathode plates to timely discover internal defects of the battery and reduce the outflow of defective batteries. However, these defects cannot be observed from the outside of the battery, and the inside of the battery needs to be inspected to determine whether the above defects exist by inspecting the shape of the tabs.

[0059] Based on the above considerations, in order to solve the problem of insufficient accuracy in detecting internal defects of batteries, ray projection detection can be used to achieve non-destructive detection of the inside of the battery. By placing the battery to be tested between the ray source and the detector, the rays emitted by the ray source penetrate the battery and are received by the detector, thereby obtaining the position and status information of the cathode and anode plates inside the battery, and then detecting various defects inside the battery.

[0060] The flat panel detector, battery 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 battery cells can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0061] 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.

[0062] 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.

[0063] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The 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.

[0064] 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.

[0065] Please refer to Figure 2 , Figure 2Schematic diagram of the exploded structure of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, 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 can be a hollow structure with one end open, the first part 11 can 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 can 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 box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0066] 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.

[0067] 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.

[0068] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes an end cover 21, a shell 22, a battery cell assembly 23 and other functional components.

[0069] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the battery cell assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0070] The shell 22 is a component used to cooperate with the end cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell assembly 23, electrolyte and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cover 21 at the opening. Without limitation, the end cover 21 and the shell 22 can also be integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cover 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the battery cell assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0071] The battery cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more battery cell assemblies 23 may be contained in the housing 22. The battery cell assembly 23 is mainly formed by winding or stacking cathode sheets and anode sheets, and a separator is usually provided between the cathode sheets and the anode sheets. The parts of the cathode sheets and the anode sheets with active substances constitute the main body of the battery cell assembly, and the parts of the cathode sheets and the anode sheets without active substances each constitute a tab 23a. The cathode tab and the anode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the cathode active substance and the anode active substance react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0072] Please refer to Figure 4-5 , Figure 4 A schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application, Figure 5 A schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application. The present application embodiment provides a battery defect detection device 400, including a ray source 420, a detector 430, and a bearing component 410 located between the ray source 420 and the detector 430, the bearing component 410 is used to carry a battery 411 to be tested, the bearing component 410 includes a bearing surface, and the battery 411 to be tested is configured to be located on the bearing surface. The battery defect detection device 400 also includes a rotating mechanism (not shown in the figure), such as Figure 4 As shown, the rotating mechanism is configured to rotate the bearing member 410 along a preset rotation axis, or as Figure 5 As shown, the rotating mechanism is configured to rotate the ray source 420 and the detector 430 along a preset axis so that the optical axis X of the ray 421 emitted by the ray source 420 is projected obliquely onto the surface of the battery 411 to be tested, and the detector 430 is configured to receive the ray 421 penetrating the battery 411 to be tested to obtain an initial image, and the initial image is used to perform defect detection on the battery 411 to be tested.

[0073] The bearing member 410 may be any bearing structure that can fix the battery 411 to be tested in a supporting or clamping manner, such as a tray, a clamp, etc. The battery 411 to be tested may be the battery cell 20 in the above embodiment, or may be a battery 100 including a plurality of battery cells 20 .

[0074] The battery to be tested 411 is configured to be located on a carrying surface, which is a surface of the carrying component 410 that contacts the battery to be tested 411 , wherein a large surface of the battery to be tested 411 is configured to abut against the carrying surface.

[0075] The ray source 420 is a device for emitting rays, mainly including a ray tube and a corresponding power supply. The ray 421 can be an X-ray or other ray. The ray tube can emit corresponding detection rays, such as an X-ray tube or a gamma-ray tube. The ray source 420 can be open (open tube) or closed (closed tube). In one example, the ray source 420 is an X-ray source, and the ray 421 it emits is an X-ray. When the ray 421 emitted by the ray source 420 passes through the battery 411 to be tested, the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the surface of the battery 411 to be tested, wherein the surface of the battery 411 to be tested can be the end face of the battery 411 to be tested, and the surface of the battery 411 to be tested can also include other faces of the battery 411 to be tested except the end face, wherein the end face of the battery 411 to be tested can be the plane where the end cover 21 in the above embodiment is located.

[0076] There is an angle θ between the optical axis X of the ray 421 emitted by the ray source 420 and at least the end face of the battery 411 to be tested. Due to the existence of the angle θ, the shielding between the internal structures of the battery 411 to be tested is reduced. The optical axis X of the ray 421 can be the central axis of multiple rays 421, or the symmetric axis of the ray emitted by the ray source 420.

[0077] The detector 430 is a two-dimensional flat panel detector, and the detector 430 may be an indirect flat panel detector.

[0078] like Figure 4 As shown, the bearing component 410 can rotate along the preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be tested carried on the bearing component 410 and the optical axis X of the ray 421 emitted by the ray source 420, so that the ray 421 can pass through the battery 411 to be tested at an angle θ, thereby reducing the shielding between the various structures in the battery 411 to be tested, so that the cathode and anode tabs can be clearly photographed at the same time in the imaging. The shielding can be the shielding of one tab to the other tab, or the shielding of any tab by other connectors or adapters.

[0079] like Figure 5 As shown, the ray source 420 and the detector 430 can rotate as a whole along the preset rotation axis W2 to change the angle θ between the end face of the battery 411 to be tested supported on the supporting component 410 and the optical axis X of the ray 421 emitted by the ray source 420, so that the ray 421 can pass through the battery 411 to be tested at an angle θ, thereby reducing the shielding between the various structures in the battery 411 to be tested, so that the cathode and anode tabs can be clearly photographed at the same time in the imaging. The shielding can be the shielding of one tab to the other tab, or the shielding of any tab by other connectors or adapters.

[0080] Based on the different rotating bodies (bearing components or a combination of a radiation source and a detector) rotated by the rotating mechanism, the positions of the preset rotating axes may be the same or different.

[0081] The rotating mechanism can be electrically rotated and controlled by an external program, or it can be a purely manual rotating structure that is manually rotated and adjusted. It is understandable that any mechanism that can be installed on a rotating body (a load-bearing component or a combination of a radiation source and a detector) and can drive the rotating body to rotate can be identified as a rotating mechanism in this application.

[0082] In the technical solution of the embodiment of the present application, the battery 411 to be tested can be tested by the ray source 420, the detector 430 and the bearing component 410. By setting a rotating mechanism, the angle θ between the end face of the battery 411 to be tested and the plane where the detector 430 is located can be flexibly adjusted according to the needs of different detection scenarios, which can reduce the shielding between the internal structures of the battery to a certain extent, and to a certain extent, the various structures inside the battery can be clearly photographed at the same time in the imaging. In some examples, at least the cathode tab and the anode tab can be clearly photographed at the same time in the imaging to a certain extent.

[0083] The rotating mechanism is configured to rotate the supporting component 410 along a preset rotation axis, or the rotating mechanism is configured to rotate the radiation source 420 and the detector 430 along a preset rotation axis. Based on the above two adjustment methods, adjusting at least the angle θ between the end face of the battery 411 to be tested and the plane where the detector 430 is located can improve to a certain extent the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle, improve the quality of the detection image, and thereby improve the accuracy of image recognition to a certain extent.

[0084] According to some embodiments of the present application, the battery defect detection device 400 further includes a defect detection unit 440 connected to the detector 430 , and the defect detection unit 440 is configured to perform defect detection on the battery to be tested 411 based on the initial image.

[0085] The defect detection unit 440 may be any computer device or a processor built into the battery defect detection apparatus 400 .

[0086] The initial image may be directly acquired by the detector 430 , or may be converted by the electrical signal generated by the detector 430 to obtain a restored image of the object being measured.

[0087] The defect detection unit 440 may also preset a corresponding image recognition algorithm, and obtain a corresponding detection result by recognizing the initial image, and determine whether the battery 411 to be tested has an abnormality based on the detection result.

[0088] By setting a defect detection unit 440 to receive the electrical signal of the detector 430 or the initial image indirectly generated, and outputting the detection result of the battery 411 to be tested, automatic detection of internal defects of the battery 411 to be tested can be achieved, thereby improving the automation level and detection efficiency of the battery detection equipment.

[0089] According to some embodiments of the present application, the battery 411 to be tested includes an end face, which is the plane where the battery end cover is located; along the direction perpendicular to the supporting surface, the projection of the middle area of ​​the end face of the battery 411 to be tested on the supporting surface is located in the middle area of ​​the supporting surface; the ray 421 emitted by the ray source 420 is configured to be projected at least obliquely to the middle area of ​​the end face of the battery 411 to be tested.

[0090] The bearing surface includes a middle area and an edge area surrounding the middle area. When the bearing surface is a centrally symmetrical figure, the middle area of ​​the bearing surface can be the geometric center of the bearing surface, or the middle area of ​​the bearing surface can be an area diffused from the geometric center to the edge area.

[0091] The battery 411 to be tested is configured to be located on the carrying surface, which is the surface of the carrying component 410 in contact with the battery 411 to be tested, wherein the large surface of the battery 411 to be tested may be configured to abut against the carrying surface, or the side surface of the battery 411 to be tested may be configured to abut against the carrying surface. When the large surface of the battery 411 to be tested is configured to abut against the carrying surface, the middle area of ​​the battery 411 to be tested is located in the middle area of ​​the carrying surface. As a feasible embodiment, the battery 411 to be tested is placed on the carrying surface in a manner of being at least centered.

[0092] If the ray 421 emitted by the ray source 420 is directed from the edge of the battery end face to the center of the battery, the shape of the lug is more difficult to detect due to the greater compaction density of the lug and the darker grayscale value in the imaging. At this time, the lug imaging is closer to the central area of ​​the battery, and the imaging of the lug structure will be more blurred due to the obstruction of structures such as the cell top cover adapter. Therefore, it is necessary to make the optical axis X of the ray 421 emitted by the ray source 420 as close as possible to the middle of the end face of the battery to be tested, so that more rays 421 pass through the center of the end face of the battery to be tested, thereby improving the clarity of the imaging of the lug structure.

[0093] Since the projection of the central area of ​​the end face of the battery 411 to be tested on the carrying surface is located in the central area of ​​the carrying surface, when the optical axis of the ray emitted by the ray source 420 is projected above the middle area of ​​the carrying surface, the ray can be shot from the middle area of ​​the end face of the battery 411 to be tested to the edge of the battery 411 to be tested, thereby reducing the obstruction of the imaging of the pole ear by the battery cell top cover adapter to a certain extent, making the imaging of the pole ear morphology clearer, thereby improving the accuracy of image recognition to a certain extent.

[0094] According to some embodiments of the present application, the preset rotation axis is perpendicular to the bearing surface.

[0095] The battery to be tested 411 is configured to be located on a carrying surface, and the carrying surface is a surface of the carrying component 410 that contacts the battery to be tested 411 .

[0096] The carrying component 410 can rotate along the preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 can also rotate along the preset rotation axis W2 as a whole to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0097] The preset rotation axis is perpendicular to the rotation plane. When the preset rotation axis is not perpendicular to the bearing surface, there is an angle between the rotation plane and the bearing surface, which may cause the bearing component 410 to block the ray 421 emitted by the ray source 420 during the rotation of the rotating mechanism.

[0098] When the bearing component 410 is rotated along the preset rotation axis, or when the ray source 420 and the detector 430 are rotated along the preset rotation axis, they are all rotated within the bearing surface, which can reduce the shielding of the ray 421 by the bearing surface to a certain extent and increase the stability of the rotation.

[0099] According to some embodiments of the present application, the preset rotating shaft is at least disposed through a middle area of ​​the bearing surface.

[0100] The bearing surface includes a middle area and an edge area surrounding the middle area. When the bearing surface is a centrally symmetrical figure, the middle area of ​​the bearing surface can be the geometric center of the bearing surface, or the middle area of ​​the bearing surface can be an area diffused from the geometric center to the edge area.

[0101] The carrying component 410 can rotate along the preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 can also rotate along the preset rotation axis W2 as a whole to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0102] When the preset rotation axes W1 and W2 are located in the central area of ​​the carrying surface, since the projection of the middle area of ​​the end surface of the battery 411 to be tested on the carrying surface is located in the middle area of ​​the carrying surface, no matter how the rotating body of the rotating mechanism (the carrying component or the combination of the radiation source and the detector) rotates, most of the rays 421 of the radiation source 420 will pass through the middle area of ​​the end surface of the battery 411 to be tested.

[0103] That is, during the rotation process, most of the rays 421 emitted by the ray source 420 can be controlled to a certain extent to always be projected obliquely to the middle area of ​​the bearing surface, that is, to the central area of ​​the end surface of the battery 411 to be tested, thereby improving the consistency and stability of the detection.

[0104] According to some embodiments of the present application, the surface of the battery 411 to be tested includes an end face, and the angle α between the end face of the battery 411 to be tested and the plane where the detector 430 is located satisfies: 0°≤α≤45°

[0105] The end surface of the battery to be tested 411 may be the plane where the end cover 21 in the above embodiment is located.

[0106] Due to the positional relationship between the ray source 420 and the detector 430, the optical axis X of the ray 421 of the ray source 420 is usually perpendicular to the plane where the detector 430 is located. Therefore, the relationship between the angle α between the end face of the battery 411 to be tested and the plane where the detector 430 is located and the angle θ between the end face of the battery 411 to be tested and the optical axis X of the ray 421 emitted by the ray source 420 satisfies that α+θ=90°

[0107] By adjusting the reasonable rotation angle, the imaging between the various structures inside the battery can be made clearer, and the detection accuracy of the shapes of the two tabs inside the battery can be improved to at least a certain extent.

[0108] Please refer to Figure 6 , Figure 6 A schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application. According to some embodiments of the present application, the battery defect detection device 400 further includes a first adjustment structure (not shown in the figure), the first adjustment mechanism is connected to the bearing component 410, and the first adjustment mechanism is configured to drive the bearing component 410 to move to adjust the distance L1 between the bearing component 410 and the radiation source 420.

[0109] According to the principle of similar triangles, the magnification of the battery defect detection device 400 is related to the distance L1 between the carrier 410 and the ray source 420. L1 can be the distance between the reference plane of the ray source 420 and the reference plane of the carrier 410, wherein the reference plane can be an artificially selected plane on the ray source 420 and the carrier 410 according to actual measurement needs, and in order to facilitate the measurement of L1, the two reference planes can be parallel to each other.

[0110] If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the detection image may not be clear enough, affecting the detection effect.

[0111] The magnification of the battery defect detection device 400 can be controlled by adjusting the distance L1 between the carrier 410 and the ray source 420, so that the initial image can be magnified and the image quality can be adjusted to a certain extent. At the same time, the size of the radiation surface irradiated on the surface of the battery 411 to be tested can also be controlled. When the distance between the ray source 420 and the carrier 410 is small, the radiation surface of the ray 421 on the surface of the battery 411 to be tested is also relatively small, and only part of the battery is irradiated by the ray, so the detection effect of local details can be improved to a certain extent; when the distance L1 between the ray source 420 and the carrier 410 increases, the radiation surface of the ray 421 on the surface of the battery 411 to be tested is also relatively increased, so that a larger detection surface can be covered, reducing the possibility of missed detection to a certain extent.

[0112] According to some embodiments of the present application, a second adjustment structure (not shown in the figure) is provided, wherein the second adjustment mechanism is connected to the radiation source 420, and the second adjustment mechanism is configured to drive the radiation source 420 to move so as to adjust the distance L2 between the radiation source 420 and the detector 430, or the second adjustment mechanism is connected to the detector 430, and the second adjustment mechanism is configured to drive the detector 430 to move so as to adjust the distance L2 between the radiation source 420 and the detector 430.

[0113] According to the principle of similar triangles, the magnification of the battery defect detection device 400 is also related to the distance L2 between the ray source 420 and the detector 430. L2 can be the distance between the reference plane of the ray source 420 and the reference plane of the detector 430, wherein the reference plane can be an artificially selected plane on the ray source 420 and the detector 430 according to actual measurement needs, and in order to facilitate the measurement of L2, the two reference planes can be parallel to each other.

[0114] If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the detection image may not be clear enough, affecting the detection effect.

[0115] By adjusting the distance between the ray source 420 and the detector 430, it is possible to adapt to different types of battery detection. At the same time, the magnification of the battery defect detection device 400 is also related to the distance L2 between the ray source 420 and the detector 430. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear enough, affecting the detection effect. Therefore, by adjusting the distance L2 between the ray source 420 and the detector 430, the magnification of the battery defect detection device 400 can be controlled, so that the initial image can be magnified and the imaging quality can be adjusted to a certain extent.

[0116] According to some embodiments of the present application, the rated voltage V of the ray source 420 satisfies: 130 kV≤V≤150 kV, and / or the rated current I of the ray source 420 satisfies: I≤500 μA.

[0117] The energy of the radiation emitted by the radiation source 420 is related to the voltage U of the radiation source 420. The greater the voltage U of the radiation source 420, the greater the energy of the radiation emitted by the radiation source 420. The intensity of the radiation emitted by the radiation source 420 is also related to the current I of the radiation source 420. The greater the current I of the radiation source 420, the greater the intensity of the radiation emitted by the radiation source 420.

[0118] The battery defect detection equipment 400 detects the interior of the battery 411 to be tested, wherein at least the morphological structure of the pole lug needs to be detected. Therefore, when detecting the pole lug, the voltage U of the ray source 420 and the current I of the ray source 420 should at least meet the requirement that the rays can penetrate the pole lug.

[0119] By setting the rated voltage V of the ray source 420 to satisfy: 130kV≤V≤150kV, and / or the rated current I of the ray source 420 to satisfy: I≤500μA, the rays emitted by the ray source 420 can penetrate the battery tabs to achieve detection, and will not be overexposed to affect the accuracy of the detection.

[0120] The second aspect of the present application provides a method for battery defect detection using the battery defect detection device 400 of any one of the above embodiments, see Figure 7 , Figure 7 A schematic flow chart of a method for battery defect detection provided in some embodiments of the present application. The method for battery defect detection performed by the battery defect detection device 400 includes:

[0121] Step S101: In response to the battery 411 to be tested being placed on the supporting component 410;

[0122] Step S102: rotating the supporting component 410 along a preset rotation axis, or rotating the ray source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the surface of the battery 411 to be tested;

[0123] Step S103 : obtaining an initial image obtained by the detector 430 by receiving the radiation penetrating the battery to be tested 411 , and the initial image is used for defect detection of the battery to be tested 411 .

[0124] The bearing member 410 may be any bearing structure that can fix the battery 411 to be tested in a supporting or clamping manner, such as a tray, a clamp, etc. The battery 411 to be tested may be the battery cell 20 in the above embodiment, or may be a battery 100 including a plurality of battery cells 20 .

[0125] The battery 411 to be tested is configured to be located on the supporting surface, which is the surface of the supporting component 410 that contacts the battery 411 to be tested, wherein the large surface of the battery 411 to be tested may be configured to abut against the supporting surface, or the side surface of the battery 411 to be tested may be configured to abut against the supporting surface.

[0126] The carrying component 410 can rotate along the preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 as a whole can rotate along the preset rotation axis W2 to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0127] The ray 421 can pass through the battery 411 under test at an angle θ, thereby reducing the shielding between the various structures in the battery 411 under test, so that the cathode tab and the anode tab can be clearly photographed at the same time in the image. The shielding can be the shielding of one tab to the other tab, or the shielding of any tab by other connectors or adapters.

[0128] In order to ensure the quality of image detection, the detector 430 needs to be calibrated before each detection or each time the battery defect detection device 400 is turned on.

[0129] Rotation of the bearing component 410 along the preset rotation axis, or rotation of the radiation source 420 and the detector 430 along the preset rotation axis can be achieved by an electric rotation mechanism, or by a manual rotation mechanism. That is, the rotation mechanism can be electric rotation and controlled by an external program, or the rotation mechanism can be a purely manual rotation structure, which is manually adjusted for rotation. It is understandable that any mechanism that can be installed on a rotating body (a bearing component or a combination of a radiation source and a detector) and can drive the rotating body to rotate can be identified as a rotation mechanism in this application.

[0130] According to the requirements of different detection scenarios, the relative angle between the battery 411 to be tested and the rays emitted by the ray source 420 can be flexibly adjusted, which can reduce the occlusion between the internal structures of the battery to a certain extent, and make the internal structures of the battery in the imaging be clearly photographed at the same time. It can improve the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle to a certain extent, improve the quality of the detection image, and thus improve the accuracy of image recognition.

[0131] According to some embodiments of the present application, the surface of the battery to be tested 411 includes an end face, and the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the surface of the battery to be tested 411 to form at least one angle between the end face and the plane where the detector 430 is located, wherein the angle is configured to satisfy:

[0132] The projection of the cathode tab of the battery 411 to be tested formed on the plane where the anode tab is located based on the ray projected onto the cathode tab is staggered with the area where the anode tab is located, or the area of ​​the overlapping area between the two is smaller than a preset value.

[0133] Since the compaction density of copper is larger and the compaction density of aluminum is smaller, the grayscale value of the copper ear (anode ear) in imaging is larger than that of the aluminum ear (cathode ear). During vertical detection, if the copper ear side is close to the radiation source, its magnification is greater, which will cause the copper ear (anode ear) to block most of the aluminum ear (cathode ear) in the imaging, resulting in unclear imaging of the cathode ear.

[0134] Therefore, when rotating, the cathode ear side of the battery 411 to be tested is closer to the radiation source than the anode ear side, so that the projection of the cathode ear of the battery to be tested on the plane where the anode ear is located based on the radiation projected to the cathode ear is staggered with the area where the anode ear is located, so as to reduce the obstruction of the anode ear on the imaging of the cathode ear. Thereby, the imaging clarity of the cathode ear is improved to a certain extent.

[0135] By adjusting the angle between the end face of the battery 411 to be tested and the plane where the detector 430 is located, the cathode ear and the anode ear can be at least partially offset in the imaging direction, thereby reducing the occlusion of one by the other, so as to improve the imaging clarity of the two to a certain extent, and then provide image recognition accuracy to improve the sampling efficiency of the detection image.

[0136] According to some embodiments of the present application, the surface of the battery to be tested 411 includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery to be tested 411 .

[0137] The battery to be tested 411 is placed on the carrying surface, which is the surface of the carrying component 410 in contact with the battery to be tested 411. The side surface of the battery to be tested 411 is also the large surface of the battery to be tested 411.

[0138] The carrying component 410 can rotate along the preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 can also rotate along the preset rotation axis W2 as a whole to change the angle θ between the end face of the battery 411 to be tested carried on the carrying component 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0139] The preset rotation axis is perpendicular to the rotation plane. When the preset rotation axis is not perpendicular to the bearing surface, there is an angle between the rotation plane and the bearing surface, which may cause the bearing component 410 to block the ray 421 emitted by the ray source 420 during the rotation of the rotating mechanism.

[0140] The preset rotation axis is perpendicular to the large surface of the battery 411 to be tested. During the rotation process, the large surface of the battery is always in the same plane, which improves the consistency and stability of the imaging after rotation, thereby improving the detection effect. In addition, by setting the rotation axis perpendicular to the bearing surface, the rotation process is carried out around the center of the battery 411 to be tested, which allows more rays to pass through the tested surface of the battery 411 to be tested to a certain extent, thereby improving the detection effect.

[0141] According to some embodiments of the present application, the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the middle area of ​​the end surface of the battery to be tested 411 .

[0142] The bearing surface includes a middle area and an edge area surrounding the middle area. When the bearing surface is a centrally symmetrical figure, the middle area of ​​the bearing surface can be the geometric center of the bearing surface, or the middle area of ​​the bearing surface can be an area diffused from the geometric center to the edge area.

[0143] If the ray 421 emitted by the ray source 420 is directed from the edge of the battery end face to the center of the battery, the shape of the lug is more difficult to detect due to the greater compaction density of the lug and the darker grayscale value in the imaging. At this time, the lug imaging is closer to the central area of ​​the battery, and the imaging of the lug structure will be more blurred due to the obstruction of structures such as the cell top cover adapter. Therefore, it is necessary to make the optical axis X of the ray 421 emitted by the ray source 420 as close as possible to the middle of the end face of the battery to be tested, so that more rays 421 pass through the center of the end face of the battery to be tested, thereby improving the clarity of the imaging of the lug structure.

[0144] Since the projection of the central area of ​​the end face of the battery 411 to be tested on the carrying surface is located in the central area of ​​the carrying surface, when the ray 421 emitted by the ray source 420 is projected to the middle area of ​​the carrying surface, the ray can be directed from the middle area of ​​the battery end face to the edge area of ​​the battery, thereby reducing the obstruction of the imaging of the pole ear by the battery cell top cover adapter to a certain extent, making the imaging of the pole ear morphology clearer, thereby improving the accuracy of image recognition to a certain extent.

[0145] According to some embodiments of the present application, the distance between the ray source 420 and the detector 430 and / or the distance between the supporting component 410 and the ray source 420 is adjusted in a direction perpendicular to the plane of the detector 430 .

[0146] According to the principle of similar triangles, the magnification of the detection device is related to the distance between the ray source 420 and the detector 430 and / or the distance between the carrier 410 and the ray source 420. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear enough, affecting the detection effect.

[0147] The magnification of the detection device can be controlled by adjusting the distance between the ray source 420 and the detector 430 and / or the distance between the supporting component 410 and the ray source 420, so that the initial image can be magnified while the imaging quality can be adjusted to a certain extent.

[0148] At the same time, the size of the radiation surface irradiated on the surface of the battery to be tested 411 can also be controlled. When the distance between the ray source 420 and the supporting component 410 is small, the radiation surface of the ray on the surface of the battery to be tested is also relatively small, and only part of the area of ​​the battery is irradiated, which can improve the detection effect of local details to a certain extent; when the distance between the ray source 420 and the supporting component 410 increases, the radiation surface of the ray on the surface of the battery to be tested is also relatively increased, so that a larger detection surface can be covered, reducing the possibility of missed detection to a certain extent.

[0149] According to some embodiments of the present application, in response to a test result of a battery to be tested being unqualified, the battery to be tested is discarded or retested.

[0150] When the tab detected in the initial image of the tested battery shows a tendency to go down, or the tab has been inserted into the electrode, the tab morphology of the tested battery is considered unqualified, and the tested battery is a risky product that needs to be rejected or re-inspected.

[0151] By outputting the test results of the battery to be tested through the initial image, automatic detection of internal defects of the battery to be tested can be achieved, thereby improving the automation level and detection efficiency of the battery testing equipment.

[0152] See also Figure 8 , Figure 8A structural block diagram of a battery defect detection device 500 provided in some embodiments of the present application. The third aspect of the present application provides a battery defect detection device, which includes an adjustment module 501 and an acquisition module 502, wherein the adjustment module 501 is configured to adjust the angle between the end face of the battery 411 to be tested and the plane where the detector 430 is located in response to the battery 411 to be tested being placed on the supporting component 410, that is, to adjust the supporting component 410 along a preset rotation axis, or to adjust the ray source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the surface of the battery 411 to be tested; the acquisition module 502 is configured to acquire an initial image obtained by the detector 430 by receiving the ray penetrating the battery 411 to be tested, and the initial image is used to perform defect detection on the battery 411 to be tested.

[0153] According to some embodiments of the present application, the relative angle between the battery to be tested and the ray emitted by the ray source can be flexibly adjusted according to the needs of different detection scenarios, which can reduce the occlusion between the internal structures of the battery to a certain extent, and to a certain extent, enable the various structures inside the battery to be clearly photographed at the same time in the imaging. It can improve the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle to a certain extent, improve the quality of the detection image, and thus improve the accuracy of image recognition to a certain extent.

[0154] According to some embodiments of the present application, the battery defect detection device 500 further includes a detection module 503, and the detection module 503 is configured to perform defect detection on the battery to be detected based on the initial image.

[0155] By setting the detection module 503 to receive the initial image generated by the detector and identify the detected image to output the detection result of the battery to be tested, the internal defects of the battery to be tested can be detected, and the automation level and detection efficiency of the battery defect detection device can be improved.

[0156] An embodiment of the fourth aspect of the present application provides an electronic device, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery defect detection method of any one of the above embodiments.

[0157] See also Fig. 9 , Fig. 9The block diagram of the electronic device 600 provided for some embodiments of the present application is an example of a hardware device that can be applied to various aspects of the present application. The electronic device is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples, and are not intended to limit the implementation of the present application described herein and / or required.

[0158] like Fig. 9 As shown, the device 600 includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the device 600 can also be stored. The computing unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0159] Multiple components in the device 600 are connected to the I / O interface 605, including: an input unit 606, an output unit 607, a storage unit 608, and a communication unit 609. The input unit 606 can be any type of device that can input information to the device 600. The input unit 606 can receive input digital or character information and generate key signal input related to user settings and / or function control of the electronic device, and can include but is not limited to a mouse, a keyboard, a touch screen, a track pad, a track ball, a joystick, a microphone, and / or a remote controller. The output unit 607 can be any type of device that can present information, and can include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 608 can include but is not limited to a disk, an optical disk. The communication unit 609 allows the device 600 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include but is not limited to a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth device, an 802.11 device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0160] The computing unit 601 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 601 performs the various methods and processes described above. For example, in some embodiments, the battery defect detection method of any of the above embodiments may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 808. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded into the RAM 803 and executed by the computing unit 801, one or more steps of the battery defect detection method of any of the above embodiments may be performed. Alternatively, in other embodiments, the computing unit 801 may be configured to perform the battery defect detection method of any of the above embodiments in any other appropriate manner (e.g., by means of firmware).

[0161] A machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0162] According to some embodiments of the present application, Figure 5-7 As shown, the embodiment of the present application provides a battery defect detection device 400, including a ray source 420, a detector 430 and a bearing component 410 located between the ray source 420 and the detector 430, the bearing component 410 is used to carry a battery 411 to be tested, the bearing component 410 includes a bearing surface, and the battery 411 to be tested is configured to be located on the bearing surface. The battery defect detection device 400 also includes a rotating mechanism, such as Figure 4 As shown, the rotating mechanism is configured to rotate the bearing member 410 along a preset rotation axis, or as Figure 5As shown, the rotating mechanism is configured to rotate the ray source 420 and the detector 430 along a preset axis so that the optical axis X of the ray 421 emitted by the ray source 420 is projected obliquely onto the surface of the battery 411 to be tested, and the detector 430 is configured to receive the ray 421 penetrating the battery 411 to be tested to obtain an initial image, and the initial image is used to perform defect detection on the battery 411 to be tested.

[0163] The method for performing battery defect detection by the battery defect detection device 400 includes:

[0164] Step S101: In response to the battery 411 to be tested being placed on the supporting component 410;

[0165] Step S102: rotating the supporting component 410 along a preset rotation axis, or rotating the ray source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the surface of the battery 411 to be tested;

[0166] Step S103 : obtaining an initial image obtained by the detector 430 by receiving the radiation penetrating the battery to be tested 411 , and the initial image is used for defect detection of the battery to be tested 411 .

[0167] refer to Fig.10 and Fig.11 , Fig.10 The detection image of the battery to be tested provided in some embodiments of the present application, Fig.11 Detection images of batteries to be tested provided in some embodiments of the present application.

[0168] Since the compaction density of copper is larger and the compaction density of aluminum is smaller, the grayscale value of the copper ear (anode ear) in imaging is larger than that of the aluminum ear (cathode ear). During vertical detection, if the copper ear side is close to the radiation source, its magnification is greater, which will cause the copper ear (anode ear) to block most of the aluminum ear (cathode ear) in the imaging, resulting in unclear imaging of the cathode ear.

[0169] Therefore, when rotating, the cathode ear side of the battery 411 to be tested is closer to the radiation source than the anode ear side, so that the projection of the cathode ear of the battery to be tested on the plane where the anode ear is located based on the radiation projected to the cathode ear is staggered with the area where the anode ear is located, so as to reduce the obstruction of the anode ear on the cathode ear imaging. Fig.10 As shown, the detection image includes a first region 4111 of the anode tab image and a second region 4112 of the cathode tab image. By adjusting the first relative angle between the battery 411 to be tested and the ray emitted by the ray source 420, the image of the cathode tab on the right side is clearer. Fig.11As shown, the detection image includes a first area 4111 for imaging the anode tab and a second area 4112 for imaging the cathode tab. By adjusting the second relative angle between the battery 411 to be tested and the rays emitted by the ray source 420, the imaging of the cathode tab on the left is also clearer, thereby improving the imaging clarity of the cathode tab to a certain extent.

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery defect detection device, characterized in that: include: Radiation source; detector; A bearing component located between the radiation source and the detector, used for bearing the battery to be tested, wherein the bearing component comprises a bearing surface, and the battery to be tested is configured to be located on the bearing surface; A rotation mechanism, wherein the rotation mechanism is configured to rotate the supporting component along a preset rotation axis, or the rotation mechanism is configured to rotate the radiation source and the detector along a preset rotation axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested, and the detector is configured to receive the radiation penetrating the battery to be tested to obtain an initial image, and the initial image is used to perform defect detection on the battery to be tested.

2. The device according to claim 1, characterized in that Also includes: A defect detection unit is connected to the detector, and is configured to perform defect detection on the battery to be tested based on the initial image.

3. The device according to claim 1 or 2, characterized in that The battery to be tested includes an end face, and the end face is the plane where the battery end cover is located; Along a direction perpendicular to the carrying surface, a projection of a middle region of the end surface of the battery to be tested on the carrying surface is located within the middle region of the carrying surface; The rays emitted by the ray source are configured to be projected at least obliquely onto a middle area of ​​the end surface of the battery to be tested.

4. The device according to any one of claims 1 to 3, characterized in that The preset rotating axis is perpendicular to the bearing surface.

5. The device according to any one of claims 1 to 3, characterized in that The preset rotating shaft is arranged through the middle area of ​​the bearing surface.

6. The device according to any one of claims 1 to 5, characterized in that The battery to be tested includes an end face, and the end face is the plane where the battery end cover is located; An included angle α between the end face and the plane where the detector is located satisfies: 0°≤α≤45°.

7. The device according to any one of claims 1 to 6, characterized in that Also includes: The first adjustment structure is connected to the bearing component and is configured to drive the bearing component to move so as to adjust the distance between the bearing component and the radiation source.

8. The device according to any one of claims 1 to 7, characterized in that Also includes: a second adjustment structure, the second adjustment mechanism is connected to the radiation source and is configured to drive the radiation source to move so as to adjust the distance between the radiation source and the detector, or The second adjustment mechanism is connected to the detector and is configured to drive the detector to move so as to adjust the distance between the ray source and the detector.

9. The device according to any one of claims 1 to 8, characterized in that The rated voltage V of the radiation source satisfies: 130kV≤V≤150kV, and / or The rated current I of the ray source satisfies: I≤500μA.

10. A method for battery defect detection using the battery defect detection device according to any one of claims 1 to 9, characterized in that: include: In response to the battery to be tested being placed on the supporting component; Rotate the bearing component along a preset rotation axis, or rotate the radiation source and the detector along a preset rotation axis, so that the optical axis of the radiation emitted by the radiation source is obliquely projected onto the surface of the battery to be tested; as well as An initial image is obtained by the detector through receiving the radiation penetrating the battery to be tested, and the initial image is used to perform defect detection on the battery to be tested.

11. The method according to claim 10, characterized in that The battery to be tested includes an end face, and the end face is the plane where the battery end cover is located; The optical axis of the ray emitted by the ray source is obliquely projected onto the surface of the battery to be tested to form at least one angle between the end face and the plane where the detector is located, and the angle is configured to satisfy: The projection of the cathode tab of the battery to be tested formed on the plane where the anode tab is located based on the ray projected onto the cathode tab is staggered with the area where the anode tab is located, or the area of ​​the overlapping area between the two is smaller than a preset value.

12. The method according to claim 10 or 11, characterized in that: The surface of the battery to be tested includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery to be tested.

13. The method according to any one of claims 10 to 12, characterized in that The battery to be tested includes an end face, and the end face is the plane where the battery end cover is located; The optical axis of the ray emitted by the ray source is projected obliquely to the middle area of ​​the end surface.

14. The method according to any one of claims 10 to 13, characterized in that Also includes: The distance between the ray source and the detector and / or the distance between the bearing component and the ray source is adjusted in a direction perpendicular to the plane where the detector is located.

15. The method according to any one of claims 10 to 14, characterized in that Also includes: In response to the test result of the battery to be tested being unqualified, the battery to be tested is discarded or retested.

16. A battery defect detection device, characterized in that: The device comprises: An adjustment module is configured to adjust the angle between the bearing surface of the bearing component and the plane where the detector is located in response to the battery to be tested being placed on the bearing component, so that the optical axis of the ray emitted by the ray source is obliquely projected onto the surface of the battery to be tested; as well as The acquisition module is configured to acquire an initial image obtained by the detector through receiving the rays penetrating the battery to be tested, and the initial image is used to perform defect detection on the battery to be tested.

17. The device according to claim 16, characterized in that The device also includes: The detection module is configured to perform defect detection on the battery to be tested based on the initial image.

18. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the battery defect detection method according to any one of claims 10 to 15.

19. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the battery defect detection method according to any one of claims 10 to 15 is implemented.

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