Battery defect detection equipment, methods and apparatus

Abstract

The battery defect detection device (400) includes a radiation source (420), a detector (430), and a mounting member (410) positioned between the radiation source (420) and the detector (430), and the battery (411) waiting for measurement is configured to be positioned on the mounting surface of the mounting member (410). The battery defect detection device (400) further includes a rotation mechanism configured to rotate the mounting member (410) along a predetermined rotation axis, or the rotation mechanism is configured to rotate the radiation source (420) and the detector (430) along a predetermined rotation axis so that the optical axis (X) of the radiation emitted from the radiation source (420) is obliquely projected onto the surface of the battery to be measured (411). According to the needs of different detection scenarios, the angle (θ) between at least the end face of the battery to be measured (411) and the plane on which the detector (430) is located can be flexibly adjusted, and each structure inside the battery can be clearly captured to a certain extent simultaneously during imaging.

Description

[Technical Field]

[0001] This application incorporates by reference Chinese patent application No. 202310797731.2, entitled "Battery Defect Detection Apparatus, Method and Device," filed on June 30, 2023, which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of battery technology, and more particularly to battery defect detection equipment, methods and apparatus. [Background technology]

[0003] Energy conservation and reduced pollutant emissions are key to the sustainable development of the automotive industry, and electric vehicles, with their energy-saving and environmental advantages, have become an important component of this industry. Battery technology is a key element in the development of electric vehicles.

[0004] Various internal defects occur in batteries during the production process, and these internal defects affect the quality and safety of the battery. While improving battery production efficiency, manufacturers are also conducting more comprehensive detection of defects that may occur during the battery manufacturing process to ensure the safety of products released to the market. When detecting internal defects in batteries, related technologies have a problem of blurred imaging of the battery interior, making it impossible to identify internal defects, which affects the reliability of the battery. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the background art, and therefore, one objective of the present application is to provide a battery defect detection device, method and apparatus for improving / mitigating / solving the problem of imaging clarity inside a battery during detection.

[0006] An embodiment of a first aspect of the present application provides a battery defect detection device, the battery defect detection device including a radiation source, a detector, and a mounting member located between the radiation source and the detector, the mounting member being used to mount a battery to be measured, the mounting member including a mounting surface, and the battery to be measured being configured to be positioned on the mounting surface.

[0007] The battery defect detection equipment further includes a rotation mechanism configured to rotate the mounting member along a predetermined rotation axis, or the rotation mechanism is configured to rotate the radiation source and the detector along a predetermined rotation axis so that the optical axis of the radiation emitted from the radiation source is projected obliquely onto the surface of the battery to be measured, and the detector is configured to receive radiation that has passed through the battery to be measured, thereby obtaining an initial image for performing defect detection on the battery to be measured.

[0008] In the technical solutions of the embodiments of the present application, a battery can be detected using a radiation source, a detector, and a mounting member, and by installing a rotation mechanism, the relative angle between the battery to be measured and the radiation emitted from the radiation source can be flexibly adjusted according to the needs of different detection scenarios, which can reduce the shielding between the various structures inside the battery to a certain extent, and can simultaneously and clearly capture the various structures inside the battery to a certain extent during imaging. In some examples, at least the cathode tab and the anode tab can be simultaneously and clearly captured to a certain extent during imaging.

[0009] The rotation mechanism is configured to rotate the mounting member along a predetermined rotation axis, or the rotation mechanism is configured to rotate the radiation source and the detector along a predetermined rotation axis. By adjusting the angle between at least the end face of the battery to be measured and the plane on which the detector is located based on the above two adjustment methods, the problem of blurred imaging of some battery internal structures due to fixed imaging angles can be alleviated to some extent, the quality of the detected image can be improved, and the accuracy of image identification can be further improved to some extent.

[0010] In some embodiments, the battery defect detection device further includes a defect detection unit connected to the detector, the defect detection unit being configured to perform defect detection on the battery to be measured based on the electrical signal or initial image of the detector. By installing the defect detection unit to receive the electrical signal or the indirectly generated initial image of the detector and output the detection result of the battery to be measured, automatic detection of defects in the battery to be measured can be realized, and the automation degree and detection efficiency of the battery detection device can be improved.

[0011] In some embodiments, the battery to be measured includes an end surface, the end surface being a plane on which the battery end cap is located, and a projection of a middle region of the end surface of the battery to be measured on the mounting surface along a direction perpendicular to the mounting surface is located within the middle region of the mounting surface, and radiation emitted from the radiation source is projected obliquely at least onto the middle region of the end surface of the battery to be measured. Because the projection of a central region of the end surface of the battery to be measured on the mounting surface is located in the central region of the mounting surface, when radiation emitted from the radiation source is projected onto the battery to be measured, the radiation impinges from the middle region of the battery to be measured toward the edge region of the battery to be measured, which can reduce to a certain extent the blocking of the imaging of the tab by the top cover adapter tab of the battery core, make the imaging of the tab shape clearer, and further improve to a certain extent the accuracy of image identification.

[0012] In some embodiments, the preset rotation axis is perpendicular to the mounting surface, and when the mounting member is rotated along the preset rotation axis, or when the source and detector are rotated along the preset rotation axis, they are both rotated within the mounting surface, which can reduce radiation shielding by the mounting surface to some extent and increase rotation stability.

[0013] In some embodiments, the preset rotation axis is drilled at least in the middle region of the mounting surface, and during the rotation, the optical axis of the radiation emitted from the radiation source is always projected obliquely onto the middle region of the mounting surface, i.e., onto the central region of the surface of the battery to be measured, which can improve the consistency and stability of the detection.

[0014] In some embodiments, the angle α between the end face of the battery to be measured and the plane on which the detector is located satisfies 0°≦α≦45°. By adjusting the rotation angle appropriately, the imaging between the structures inside the battery can be made clearer, and the detection accuracy of at least the two tab shapes inside the battery can be improved to some extent.

[0015] In some embodiments, the battery defect detection device further includes a first adjustment mechanism, the first adjustment mechanism is connected to the mounting member, and the first adjustment mechanism is configured to drive the mounting member to move and adjust the distance between the mounting member and the radiation source. Based on the principle of similar triangles, the magnification factor of the battery defect detection device is related to the distance between the mounting member and the radiation source. If the magnification factor is too small, the magnification effect cannot be fully realized, and if the magnification factor is too large, the detection image will not be clear enough, which may affect the detection effect.

[0016] Therefore, by adjusting the distance between the mounting member and the radiation source, the magnification factor of the detection device can be controlled, so that the initial image can have a magnification effect, and at the same time, the imaging quality can be adjusted to a certain extent.

[0017] At the same time, the size of the radiation surface irradiated on the surface of the battery waiting to be measured can also be controlled. When the distance between the radiation source and the mounting member is relatively small, the radiation surface on the surface of the battery waiting to be measured is also relatively small, and only a part of the battery is irradiated by radiation, which can improve the detection effect of local details to a certain extent. When the distance between the radiation source and the mounting member increases, the radiation surface on the surface of the battery waiting to be measured also increases relatively, thereby covering a larger detection surface and reducing the possibility of missed inspections to a certain extent.

[0018] In some embodiments, the battery defect detection apparatus further includes a second adjustment mechanism, wherein the second adjustment mechanism is connected to the source and configured to drive the source to move to adjust the distance between the 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 source and the detector.

[0019] By adjusting the distance between the radiation source and the detector, it can be adapted to the detection of different models of batteries. The magnification factor of the battery defect detection device is also related to the distance between the radiation source and the detector. If the magnification factor is too small, the magnification effect cannot be fully realized, and if the magnification factor is too large, the initial image will not be clear enough, which may affect the detection effect. Therefore, by adjusting the distance between the radiation source and the detector, the magnification factor of the battery defect detection device can be controlled, so that the initial image can achieve the magnification effect and also adjust the imaging quality to a certain extent.

[0020] 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 from the radiation source can penetrate the battery tab to achieve detection, and the phenomenon of overexposure that affects the detection accuracy can be prevented.

[0021] An embodiment of a second aspect of the present application provides a method for detecting battery defects using any one of the battery defect detection devices in the above embodiments, the method including: in response to a battery to be measured being placed on a mounting member, rotating the mounting member along a predetermined rotation axis, or rotating the radiation source and the detector along a predetermined rotation axis, so that the optical axis of radiation emitted from the radiation source is projected obliquely onto the surface of the battery to be measured; and acquiring an initial image for performing defect detection on the battery to be measured, obtained by the detector receiving the radiation that has passed through the battery to be measured.

[0022] According to the needs of different detection scenarios, the relative angle between the battery to be measured and the radiation emitted from the radiation source can be flexibly adjusted, which can reduce the shielding between the structures inside the battery to a certain extent, and can simultaneously and clearly capture the structures inside the battery during imaging to a certain extent, which can improve the problem of some internal battery structures being blurred due to fixed imaging angles to a certain extent, improve the quality of the detection image, and further improve the accuracy of image identification to a certain extent.

[0023] In some embodiments, the optical axis of the radiation emitted from the radiation source is projected obliquely onto the surface of the battery to be measured, and adjusted to form at least one angle between the end face of the battery to be measured and the plane on which the detector is located, and this angle is configured so that the cathode tab of the battery to be measured is positioned offset from the projection formed on the plane on which the anode tab is located based on the radiation projected onto the cathode tab, or the area of ​​the overlapping area between the two is smaller than a predetermined value.

[0024] By adjusting the angle between the end face of the battery to be measured and the plane on which the detector is located, the cathode tab and the anode tab can be at least partially offset in the imaging direction, thereby reducing the shielding of one by the other and improving the imaging clarity of both to a certain extent, further improving the image identification accuracy and increasing the efficiency of spot inspection of the detected image.

[0025] In some embodiments, the surface of the battery to be measured includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery to be measured. The side surface of the battery to be measured is the wide surface of the battery to be measured, and the preset rotation axis is perpendicular to the wide surface of the battery to be measured, so that the wide surface of the battery is always in the same plane during the rotation, which improves the consistency and stability of the imaging after rotation, thereby improving the detection effect.

[0026] In some embodiments, the optical axis of the radiation emitted from the radiation source is projected obliquely onto the middle region of the end face of the battery to be measured, and the projection of the central region of the end face of the battery to be measured on the mounting surface is located in the central region of the mounting surface, i.e., the central region of the wide surface of the battery to be measured is located in the central region of the mounting surface.Therefore, when the radiation emitted from the radiation source is projected onto the middle region of the end face of the battery to be measured, the radiation impinges from the middle region of the battery end face towards the edge region of the battery, which can reduce to a certain extent the obstruction of the imaging of the tab by the top cover adapter tab of the battery core, make the imaging of the tab shape clearer, and further improve to a certain extent the accuracy of image identification.

[0027] In some embodiments, the distance between the source and the detector and / or the distance between the mounting member and the source is adjusted in a direction perpendicular to the plane of the detector.

[0028] Based on the principle of similar triangles, the magnification factor of the battery defect detection device is related to the distance between the radiation source and the detector and / or the distance between the mounting member and the radiation source. If the magnification factor is too small, the magnification effect cannot be fully realized, and if the magnification factor is too large, the initial image will not be clear enough, which may affect the detection effect. Therefore, by adjusting the distance between the radiation source and the detector and / or the distance between the mounting member and the radiation source, the magnification factor of the detection device can be controlled, so that the initial image can achieve the magnification effect and also adjust the imaging quality to a certain extent.

[0029] At the same time, the size of the radiation surface irradiated on the surface of the battery waiting to be measured can also be controlled. When the distance between the radiation source and the mounting member is relatively small, the radiation surface on the surface of the battery waiting to be measured is also relatively small, and only a part of the battery is irradiated by radiation, which can improve the detection effect of local details to a certain extent. When the distance between the radiation source and the mounting member increases, the radiation surface on the surface of the battery waiting to be measured also increases relatively, thereby covering a larger detection surface and reducing the possibility of missed inspections to a certain extent.

[0030] In some embodiments, in response to a failure of the detection result of the battery to be measured, the battery to be measured is excluded or retested.

[0031] An embodiment of a third aspect of the present application provides a battery defect detection device, the device including an adjustment module and an acquisition module, wherein the adjustment module is configured to adjust the mounting member along a predetermined rotation axis in response to a battery to be measured being placed on the mounting member, or adjust the radiation source and the detector along the predetermined rotation axis so that the optical axis of radiation emitted from the radiation source is projected obliquely onto the surface of the battery to be measured, and the acquisition module is configured to acquire an initial image for performing defect detection on the battery to be measured, obtained by the detector receiving radiation that has passed through the battery to be measured.

[0032] According to the needs of different detection scenarios, the relative angle between the battery to be measured and the radiation emitted from the radiation source can be flexibly adjusted, which can reduce the shielding between the structures inside the battery to a certain extent, and can simultaneously and clearly capture the structures inside the battery during imaging to a certain extent, which can improve the problem of some internal battery structures being blurred due to fixed imaging angles to a certain extent, improve the quality of the detection image, and further improve the accuracy of image identification to a certain extent.

[0033] In some embodiments, the battery defect detection device further includes a detection module configured to perform defect detection on the battery to be measured based on the initial image. The detection module is installed to receive the initial image generated by the detector, identify the detected image, and output the detection result on the battery to be measured, thereby realizing the detection of defects in the battery to be measured and improving the automation degree and detection efficiency of the battery defect detection device.

[0034] An embodiment of a fourth aspect of the present application provides an electronic device, the electronic device including at least one processor and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform any one of the battery defect detection methods in the above embodiments.

[0035] An embodiment of a fifth aspect of the present application provides a battery fault detection device, which includes the electronic device in the above embodiment.

[0036] An embodiment of a sixth aspect of the present application provides a computer-readable storage medium having a computer program stored therein, the computer program realizing, when executed by a processor, any one of the battery defect detection methods in the above embodiments.

[0037] The above description is merely an outline of the technical solution of the present application. In order to enable the technical means of the present application to be more clearly understood, to be implemented in accordance with the content of the specification, and to make the above and other objectives, features and advantages of the present application more apparent, the following particularly cites specific embodiments of the present application for description. [Brief explanation of the drawings]

[0038] In the drawings, unless otherwise specified, the same reference numerals represent the same or similar parts or elements throughout the drawings. The drawings are not necessarily drawn to scale. It should be understood that these drawings only illustrate some embodiments disclosed in accordance with the present application and should not be considered as limiting the scope of the present application. In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that may be used in the embodiments of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without any creative effort. [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application; [Figure 2] 1 is a schematic exploded structural view of a battery according to some embodiments of the present application; [Figure 3] FIG. 2 is a schematic exploded structural view of a battery cell according to some embodiments of the present application. [Figure 4] 1 is a structural schematic diagram of a battery defect detection device according to some embodiments of the present application; [Figure 5] 1 is a structural schematic diagram of a battery defect detection device according to some embodiments of the present application; [Figure 6] 1 is a structural schematic diagram of a battery defect detection device according to some embodiments of the present application; [Figure 7] 1 is a method flowchart for detecting battery defects according to some embodiments of the present application. [Figure 8] FIG. 1 is a structural block diagram of a battery defect detection device according to some embodiments of the present application. [Figure 9] FIG. 1 is a structural block diagram of an electronic device according to some embodiments of the present application. [Figure 10] 10 is a detected image of a battery waiting to be measured according to some embodiments of the present application. [Figure 11] 10 is a detected image of a battery waiting to be measured according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0039] The following describes in detail the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are only used to more clearly explain the technical solution of the present application, and are merely examples, which do not limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used herein are only for describing specific embodiments and are not intended to limit this application. The terms "comprises" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover a non-exclusive "comprise."

[0041] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only for distinguishing different objects, and should not be understood as indicating or implying relative importance, or the number, specific order, or hierarchical relationship of the technical features shown. In the description of the embodiments of the present application, unless otherwise clearly and specifically limited, the meaning of "plurality" is two or more.

[0042] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various locations throughout the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, independent, or alternative embodiments. Those skilled in the art can explicitly or implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "and / or" is merely a relation that describes related objects and indicates that three relations may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0044] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0045] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown in the drawings, and are intended only for the convenience and simplification of the description of the embodiments of the present application. They do not indicate or imply that the referred devices or elements must have a specific orientation or be configured and operated in a specific orientation, and therefore should not be understood as limitations of the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, the technical terms "attached," "connected," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0047] At present, from the viewpoint of the development of the market situation, the application of power batteries is becoming more and more widespread. Power batteries are not only applied to energy storage power systems such as hydroelectric power, thermal power, wind power and solar power stations, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles and electric cars, as well as military equipment and aerospace, etc. As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

[0048] The applicant has found that defects may occur in batteries during their production and use. For example, defects such as folded tabs or broken tabs may occur during battery production, and it is necessary to remove defective batteries to prevent them from affecting battery reliability to some extent. Meanwhile, the pitch of the negative and positive electrode plates and the amount of misalignment between the negative and positive electrode plates within the battery are also important factors affecting the safety performance of the battery. Regarding the pitch of the negative and positive electrode plates, if the pitch of the negative and positive electrode plates is too large during the charge and discharge process of a lithium battery, lithium ions cannot be fully embedded in the anode channel, and some lithium ions will accumulate, resulting in lithium deposition problems and posing a significant safety risk. Therefore, it is necessary to ensure that the pitch of the negative and positive electrode plates within the battery is not too large. Regarding the misalignment between the cathode and anode plates, during the charge and discharge process of a lithium battery, lithium ions repeatedly detach between the cathode and anode plates. If there are not enough anode channels to accommodate the lithium ions after they detach from the cathode, the lithium ions are likely to accumulate and precipitate, posing a safety risk to the product. Therefore, it is necessary to ensure that the entire cathode plate is within the coverage of the anode, i.e., that the anode extends beyond the cathode, and that the misalignment between the cathode and anode plates is greater than zero. Therefore, it is necessary to detect the pitch and misalignment between the cathode and anode plates within the battery to promptly detect internal defects and reduce the number of defective batteries. However, these defects cannot be observed from the outside of the battery; therefore, the presence of such defects must be determined by examining the inside of the battery and examining the tab morphology.

[0049] Based on the above considerations, to solve the problem of insufficient accuracy in detecting defects inside batteries, a radiation projection detection method can be adopted to realize non-destructive detection inside batteries. By placing a battery to be measured between the radiation source and the detector, the radiation emitted from the radiation source can be received by the detector after passing through the battery, thereby obtaining position and status information of the cathode and anode plates inside the battery and further detecting various defects inside the battery.

[0050] The flat panel detector, battery detection device, and battery production equipment disclosed in the embodiments of the present application may be used in the production and manufacturing stage of batteries, and the detected or produced battery cells may be used in power consuming devices such as, but not limited to, vehicles, ships, and aircraft, etc. The battery cells, batteries, etc. disclosed in the present application can be used to configure the power supply system of the power consuming device.

[0051] An embodiment of the present application provides a power-consuming device that uses a battery as a power source, and the power-consuming device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, and an electric plane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0052] For convenience of explanation, the following embodiment will be described by taking an example in which the power consumption device of one embodiment of the present application is a vehicle 1000.

[0053] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range extender vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 1000 to power the motor 300, for example, for starting the vehicle 1000, navigation, and operating power consumption needs during driving.

[0054] In some embodiments of the present application, the battery 100 may be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, providing driving power to the vehicle 1000 in place of or in place of fuel oil or natural gas.

[0055] Referring to FIG. 2, FIG. 2 is a schematic exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a housing 10 and battery cells 20, which are housed within the housing 10. The housing 10 is used to provide a housing space for the battery cells 20, and the housing 10 may have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which are fitted over each other and which collectively define a housing space for housing the battery cells 20. The second part 12 may have a hollow structure with one end open, and the first part 11 may have a plate-like structure, and the first part 11 is placed over the open side of the second part 12, so that the first part 11 and the second part 12 jointly define an accommodation space, and the first part 11 and the second part 12 may both have a hollow structure with one end open, and the open side of the first part 11 is placed over the open side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0056] The battery 100 may include a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel. A series-parallel connection means that the plurality of battery cells 20 are connected in both series and parallel. The plurality of battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and the entire battery cell set may be housed within the housing 10. Of course, the battery 100 may first be configured in the form of a battery module by connecting the plurality of battery cells 20 in series, in parallel, or in series-parallel, and then the plurality of battery modules may be further connected in series, in parallel, or in series-parallel to form a whole battery set housed within the housing 10. The battery 100 may further include other structures, for example, the battery 100 may further include bus bar members for realizing electrical connection between the plurality of battery cells 20.

[0057] Here, each battery cell 20 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 20 may be cylindrical, flat, rectangular, or have other shapes.

[0058] Referring to Figure 3, Figure 3 is an exploded structural schematic diagram of a battery cell 20 according to some embodiments of the present application. The battery cell 20 is the smallest unit constituting a battery. As shown in Figure 3, the battery cell 20 includes an end cap 21, a case 22, a battery core assembly 23, and other functional components.

[0059] The end cap 21 is a member that covers an opening of the case 22 and isolates the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 may be adapted to the shape of the case 22 so as to fit snugly within the case 22, without being limited thereto. In some embodiments, the end cap 21 may be made of a material (e.g., an aluminum alloy) with a certain hardness and strength. Thus, the end cap 21 is less likely to deform when subjected to a crush or collision, thereby providing the battery cell 20 with higher structural strength and improving safety performance. Functional members such as electrode terminals 21a may be provided on the end cap 21. The electrode terminals 21a may be used to electrically connect to the battery core assembly 23 to output or input electrical energy to or from the battery cell 20. In some embodiments, the end cap 21 may further be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not particularly limited thereto. In some embodiments, an insulating member may be installed inside the end cap 21. The insulating member may be used to isolate electrical connection members in the case 22 from the end cap 21 and reduce the risk of short circuits. Illustratively, the insulating member may be made of plastic, rubber, etc.

[0060] The case 22 is an assembly that fits into the end cap 21 to form an internal environment of the battery cell 20. The formed internal environment may be used to accommodate the battery core assembly 23, electrolyte, and other components. The case 22 and the end cap 21 may be separate components, or an opening may be provided on the case 22 and the end cap 21 may be placed over the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the case 22 may be integrated. Specifically, the end cap 21 and the case 22 may first form a common connection surface before other components are placed in the case, and then the end cap 21 may be placed over the case 22 when necessary to package the interior of the case 22. The case 22 may have various shapes and sizes, such as a rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined depending on the specific shape and size of the battery core assembly 23. The case 22 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application is not particularly limited thereto.

[0061] The battery core assembly 23 is a component where the electrochemical reaction occurs in the battery cell 20. One or more battery core assemblies 23 may be included within the case 22. The battery core assembly 23 is primarily formed by winding or stacking cathode and anode plates, and typically has a separator between them. The portions of the cathode and anode plates with active material constitute the body of the battery core assembly, and the portions of the cathode and anode plates without active material constitute tabs 23a, respectively. The cathode tab and the anode tab may be jointly located at one end of the body, or may be located at both ends of the body. During the battery charge and discharge process, the cathode active material and the anode active material react with the electrolyte, and the tabs 23a connect the electrode terminals to form a current circuit.

[0062] 4-5, Fig. 4 is a structural schematic diagram of a battery defect detection device 400 according to some embodiments of the present application, and Fig. 5 is a structural schematic diagram of a battery defect detection device 400 according to some embodiments of the present application. An embodiment of the present application provides a battery defect detection device 400, which includes a radiation source 420, a detector 430, and a mounting member 410 located between the radiation source 420 and the detector 430, the mounting member 410 being used to mount a battery to be measured 411, the mounting member 410 including a mounting surface, and the battery to be measured 411 being configured to be located on the mounting surface. The battery defect detection equipment 400 further includes a rotation mechanism (not shown), which is configured to rotate the mounting member 410 along a predetermined rotation axis as shown in FIG. 4, or as shown in FIG. 5, the rotation mechanism is configured to rotate the radiation source 420 and the detector 430 along a predetermined rotation axis to project the optical axis X of the radiation 421 emitted from the radiation source 420 obliquely onto the surface of the battery to be measured 411, and the detector 430 is configured to receive the radiation 421 that has passed through the battery to be measured 411 and obtain an initial image for performing defect detection on the battery to be measured 411.

[0063] The mounting member 410 may have any mounting structure and may fix the battery to be measured 411 by a supporting or clamping method, such as using a tray, a gripper, etc. The battery to be measured 411 may be the battery cell 20 in the above embodiment, or may be a battery 100 including a plurality of battery cells 20.

[0064] The measurement-ready battery 411 is configured to be positioned on a mounting surface, which is the surface on which the mounting member 410 contacts the measurement-ready battery 411, and here, the wide surface of the measurement-ready battery 411 may be positioned to abut against the mounting surface.

[0065] The radiation source 420 is a device for emitting radiation and mainly includes a radiation tube and a corresponding power source. The radiation 421 may be X-rays or other radiation. The radiation tube may emit corresponding detection radiation, such as X-rays or gamma rays. The radiation source 420 may be an open type (open tube) or a closed type (closed tube). In one example, the radiation source 420 is an X-ray source, and the radiation 421 emitted therefrom is X-rays. When the radiation 421 emitted from the radiation source 420 passes through the measurement-ready battery 411, the optical axis X of the radiation 421 emitted from the radiation source 420 is projected obliquely onto the surface of the measurement-ready battery 411. Here, the surface of the measurement-ready battery 411 may be an end face of the measurement-ready battery 411. The surface of the measurement-ready battery 411 may also include surfaces other than the end face of the measurement-ready battery 411. Here, the end face of the measurement-ready battery 411 may be a plane on which the end cap 21 in the above embodiment is located.

[0066] An angle θ exists between the optical axis X of the radiation 421 emitted from the radiation source 420 and at least the end face of the battery waiting for measurement 411, and the existence of this angle θ reduces shielding between the structures inside the battery waiting for measurement 411. Here, the optical axis X of the radiation 421 may be the central axis of the plurality of radiations 421 or may be the axis of symmetry of the radiation emitted from the radiation source 420.

[0067] Detector 430 is a two-dimensional flat panel detector, and detector 430 may also be an indirect flat panel detector.

[0068] 4, the mounting member 410 can rotate about a preset rotation axis W1 to change the angle θ between the end face of the battery to be measured 411 mounted on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420. By allowing the radiation 421 to pass through the battery to be measured 411 at one angle θ, it is possible to reduce the shielding between the various structures in the battery to be measured 411, and to simultaneously and clearly photograph the cathode tab and the anode tab in the imaging. This shielding may be one of the tabs shielding another tab, or may be one of the tabs shielded by another connecting member or adapter tab.

[0069] 5, the radiation source 420 and the detector 430 can rotate as a whole along a predetermined rotation axis W2 to change the angle θ between the end face of the battery-to-be-measured 411 placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420. By passing the radiation 421 through the battery-to-be-measured 411 at one angle θ, it is possible to reduce shielding between the various structures in the battery-to-be-measured 411, and to simultaneously and clearly photograph the cathode tab and the anode tab in imaging. This shielding may be one of the tabs shielding another, or may be one of the tabs shielded by another connecting member or adapter tab.

[0070] The preset position of the rotation axis may be the same or different depending on the rotating body (mounting member or combination of radiation source and detector) that the rotation mechanism rotates.

[0071] The rotation mechanism may be motorized and controlled by an external program, or may be a purely manual rotation structure with manual rotation adjustment. As can be understood, any mechanism that can be mounted on a rotating body (mounting member or source and detector combination) and that can rotate the rotating body can all be qualified as a rotation mechanism in this application.

[0072] In the technical solutions of the embodiments of the present application, the battery to be measured 411 can be detected by the radiation source 420, the detector 430, and the mounting member 410. By installing a rotation mechanism, the angle θ between the end face of the battery to be measured 411 and the plane on which the detector 430 is located can be flexibly adjusted according to the needs of different detection scenarios, which can reduce the shielding between the various structures inside the battery to a certain extent, and can simultaneously and clearly capture the various structures inside the battery to a certain extent during imaging. In some examples, at least the cathode tab and the anode tab can be simultaneously and clearly captured to a certain extent during imaging.

[0073] The rotation mechanism is configured to rotate the mounting member 410 along a predetermined rotation axis, or the rotation mechanism is configured to rotate the radiation source 420 and the detector 430 along a predetermined rotation axis. By adjusting the angle θ between at least the end face of the battery to be measured 411 and the plane on which the detector 430 is located based on the above two adjustment methods, the problem of blurred imaging of some battery internal structures due to fixed imaging angles can be alleviated to some extent, the quality of the detected image can be improved, and the accuracy of image identification can be further improved to some extent.

[0074] According to some embodiments of the present application, the battery defect detection equipment 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 measured 411 based on the initial image.

[0075] The fault detection unit 440 may be any computing device or processor embedded within the battery fault detection apparatus 400 .

[0076] The initial graphics may be directly acquired by the detector 430, or may be converted by the electrical signals generated by the detector 430 to obtain a reconstructed image of the measured object.

[0077] The defect detection unit 440 can also preset a corresponding image identification algorithm, and by identifying the initial image, obtain a corresponding detection result, and determine whether there is an abnormality in the battery waiting to be measured 411 according to the detection result.

[0078] By installing a defect detection unit 440 to receive the electrical signal or indirectly generated initial image from the detector 430 and output the detection result of the battery to be measured 411, automatic detection of defects inside the battery to be measured 411 can be realized, and the automation degree and detection efficiency of the battery detection equipment can be improved.

[0079] According to some embodiments of the present application, the measurement-ready battery 411 includes an end surface, which is a plane on which the battery end cap is located, and along a direction perpendicular to the mounting surface, the projection of the intermediate region of the end surface of the measurement-ready battery 411 on the mounting surface is located within the intermediate region of the mounting surface, and the radiation 421 emitted from the radiation source 420 is configured to be projected obliquely onto at least the intermediate region of the end surface of the measurement-ready battery 411.

[0080] The mounting surface includes an intermediate region and an edge region surrounding the intermediate region, and if the mounting surface is a centrosymmetric graphic, the intermediate region of the mounting surface may be the geometric center of the mounting surface, or the intermediate region of the mounting surface may be a single region diverging from this geometric center toward the edge region.

[0081] The battery-to-be-measured 411 is configured to be placed on a placement surface, and the placement surface is a surface of the placement member 410 that contacts the battery-to-be-measured 411. Here, the wide surface of the battery-to-be-measured 411 may be arranged to abut against the placement surface, or the side surface of the battery-to-be-measured 411 may be arranged to abut against the placement surface. When the wide surface of the battery-to-be-measured 411 is arranged to abut against the placement surface, the middle region of the battery-to-be-measured 411 is located in the middle region of the placement surface. In one possible embodiment, the battery-to-be-measured 411 is placed on the placement surface in a manner that it is at least centered.

[0082] When radiation 421 emitted from radiation source 420 strikes the battery end face from the edge toward the center of the battery, the tab compaction density increases and the grayscale value in the image becomes darker, making it more difficult to detect the tab shape. At this time, the tab approaches the central region of the battery in the image and is shielded by structures such as the top cover adapter tab of the battery core, making the image of the tab structure more blurred. Therefore, it is necessary to bring the optical axis X of radiation 421 emitted from radiation source 420 as close as possible to the center of the end face of the battery to be measured, so that more radiation 421 passes through the center of the end face of the battery to be measured and improve the clarity of the image of the tab structure.

[0083] Since the projection of the central region of the end face of the battery 411 to be measured on the mounting surface is located in the central region of the mounting surface, when the optical axis of the radiation emitted from the radiation source 420 is projected above the middle region of the mounting surface, the radiation impinges from the middle region of the end face of the battery 411 to the edge of the battery 411 to be measured, which reduces to a certain extent the obstruction of the imaging of the tab by the top cover adapter tab of the battery core, makes the imaging of the tab shape clearer, and further improves to a certain extent the accuracy of image identification.

[0084] According to some embodiments of the present application, the preset rotation axis is perpendicular to the mounting surface.

[0085] The battery-to-be-measured 411 is configured to be placed on a placement surface, and the placement surface is the surface of the placement member 410 that comes into contact with the battery-to-be-measured 411 .

[0086] The mounting member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420. The radiation source 420 and the detector 430 can also rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420.

[0087] The preset rotation axis is perpendicular to the rotation plane, and if the preset rotation axis is not perpendicular to the mounting surface, an angle will exist between the rotation plane and the mounting surface, and there is a possibility that the mounting member 410 will block radiation 421 emitted from the radiation source 420 during the rotation process of the rotation mechanism.

[0088] When the mounting member 410 is rotated along a predetermined rotation axis, or when the source 420 and the detector 430 are rotated along a predetermined rotation axis, they are both rotated within the mounting surface, which can reduce the shielding of the radiation 421 by the mounting surface to a certain extent and increase the stability of the rotation.

[0089] According to some embodiments of the present application, the preset rotation axis is drilled at least in a middle region of the mounting surface.

[0090] The mounting surface includes an intermediate region and an edge region surrounding the intermediate region, and if the mounting surface is a centrosymmetric graphic, the intermediate region of the mounting surface may be the geometric center of the mounting surface, or the intermediate region of the mounting surface may be a single region diverging from this geometric center toward the edge region.

[0091] The mounting member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420. The radiation source 420 and the detector 430 can also rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420.

[0092] When the preset rotation axes W1 and W2 are located in the central region of the mounting surface, the projection of the intermediate region of the end face of the measurement-waiting battery 411 on the mounting surface is located within the intermediate region of the mounting surface, so regardless of how the rotating body of the rotation mechanism (the mounting member or the combination of the radiation source and the detector) rotates, most of the radiation 421 of the radiation source 420 passes through the intermediate region of the end face of the measurement-waiting battery 411.

[0093] That is, during the rotation process, most of the radiation 421 emitted from the radiation source 420 is always projected obliquely onto the middle region of the mounting surface, i.e., onto the central region of the end face of the battery 411 to be measured, which can be controlled to a certain extent, thereby improving the consistency and stability of detection.

[0094] According to some embodiments of the present application, the surface of the measurement-ready battery 411 includes an end face, and the angle α between the end face of the measurement-ready battery 411 and the plane on which the detector 430 is located satisfies 0°≦α≦45°.

[0095] The end face of the battery waiting to be measured 411 may be the plane on which the end cap 21 in the above embodiment is located.

[0096] Due to the positional relationship between the radiation source 420 and the detector 430, the optical axis X of the radiation 421 of the radiation source 420 is generally perpendicular to the plane on which the detector 430 is located, so the relationship between the angle α between the end face of the measurement-waiting battery 411 and the plane on which the detector 430 is located and the angle θ between the end face of the measurement-waiting battery 411 and the optical axis X of the radiation 421 emitted from the radiation source 420 satisfies α+θ=90°.

[0097] By adjusting the rotation angle reasonably, the imaging between the structures inside the battery can be made clearer, and the detection accuracy of at least the two tab shapes inside the battery can be improved to some extent.

[0098] 6, which is a structural schematic diagram of a battery defect detection apparatus 400 according to some embodiments of the present application. According to some embodiments of the present application, the battery defect detection apparatus 400 further includes a first adjustment structure (not shown), where the first adjustment mechanism is connected to the mounting member 410, and the first adjustment mechanism is configured to drive the mounting member 410 to move and adjust the distance L1 between the mounting member 410 and the radiation source 420.

[0099] Based on the principle of similar triangles, the magnification factor of the battery defect detection device 400 is related to the distance L1 between the mounting member 410 and the radiation source 420. L1 may be the distance from the reference plane of the radiation source 420 to the reference plane of the mounting member 410, where, according to actual measurement needs, the reference plane may be an artificially selected plane on the radiation source 420 and the mounting member 410, and the two reference planes may be parallel to each other to facilitate the measurement of L1.

[0100] If the magnification factor is too small, the magnification effect cannot be fully realized, and if the magnification factor is too large, the detected image will not be clear enough, which may affect the detection effect.

[0101] By adjusting the distance L1 between the mounting member 410 and the radiation source 420, the magnification factor of the battery defect detection device 400 can be controlled, thereby achieving a magnification effect on the initial image and also adjusting the imaging quality to a certain extent. At the same time, the size of the radiation surface irradiated on the surface of the battery to be measured 411 can also be controlled. When the distance between the radiation source 420 and the mounting member 410 is relatively small, the radiation surface of the radiation 421 on the surface of the battery to be measured 411 is also relatively small, and only a portion of the battery is irradiated by the radiation, thereby improving the detection effect of local details to a certain extent. When the distance L1 between the radiation source 420 and the mounting member 410 is increased, the radiation surface of the radiation 421 on the surface of the battery to be measured 411 also increases relatively, covering a larger detection surface and reducing the possibility of missed inspections to a certain extent.

[0102] According to some embodiments of the present application, the battery defect detection apparatus further includes a second adjustment structure (not shown), wherein the second adjustment mechanism is connected to the radiation source 420 and configured to drive the radiation source 420 to move 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 configured to drive the detector 430 to move to adjust the distance L2 between the radiation source 420 and the detector 430.

[0103] Based on the principle of similar triangles, the magnification factor of the battery defect detection equipment 400 is also related to the distance L2 between the radiation source 420 and the detector 430. L2 may be the distance between the reference plane of the radiation source 420 and the reference plane of the detector 430, where, according to the actual measurement needs, the reference plane may be an artificially selected plane on the radiation source 420 and the detector 430, and the two reference planes may be parallel to each other to facilitate the measurement of L2.

[0104] If the magnification factor is too small, the magnification effect cannot be fully realized, and if the magnification factor is too large, the detected image will not be clear enough, which may affect the detection effect.

[0105] The distance between the radiation source 420 and the detector 430 can be adjusted to accommodate the detection of different models of batteries, and the magnification factor of the battery defect detection device 400 is also related to the distance L2 between the radiation source 420 and the detector 430. If the magnification factor is too small, the magnification effect cannot be fully realized, and if the magnification factor is too large, the initial image may not be clear enough, which may affect the detection effect. Therefore, by adjusting the distance L2 between the radiation source 420 and the detector 430, the magnification factor of the battery defect detection device 400 can be controlled, which can achieve the magnification effect of the initial image and also adjust the imaging quality to a certain extent.

[0106] According to some embodiments of the present application, the rated voltage V of the source 420 satisfies 130 kilovolts (kV)≦V≦150 kV, and / or the rated current I of the source 420 satisfies I≦500 microamperes (μA).

[0107] The energy of the radiation emitted from the radiation source 420 is related to the voltage U of the radiation source 420, and the larger the voltage U of the radiation source 420, the greater the energy of the radiation emitted from the radiation source 420. The intensity of the radiation emitted from the radiation source 420 is also related to the current I of the radiation source 420, and the larger the current I of the radiation source 420, the greater the intensity of the radiation emitted from the radiation source 420.

[0108] The battery defect detection device 400 detects the inside of the battery 411 to be measured, and here, it is necessary to detect at least the morphological structure of the tab. Therefore, when detecting the tab, the voltage U of the radiation source 420 and the current I of the radiation source 420 should at least satisfy the requirement that the radiation can penetrate the tab.

[0109] By setting the rated voltage V of the radiation source 420 to satisfy 130 kV≦V≦150 kV and / or the rated current I of the radiation source 420 to satisfy I≦500 μA, the radiation emitted from the radiation source 420 can penetrate the battery tab to achieve detection, and the phenomenon of overexposure that affects the detection accuracy will not occur.

[0110] An embodiment of the second aspect of the present application provides a method for performing battery defect detection using any one of the battery defect detection devices 400 in the above embodiments, and referring to Figure 7, Figure 7 is a flowchart of a method for battery defect detection according to some embodiments of the present application, where the method for performing battery defect detection by the battery defect detection device 400 includes the following steps:

[0111] Step S101: In response to the battery 411 waiting for measurement being placed on the mounting member 410, Step S102: Rotate the mounting member 410 along a preset rotation axis, or rotate the radiation source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the radiation 421 emitted from the radiation source 420 is obliquely projected onto the surface of the measurement-ready battery 411; Step S103: The detector 430 receives radiation that has passed through the measurement-awaiting battery 411, and obtains an initial image for defect detection of the measurement-awaiting battery 411.

[0112] The mounting member 410 may have any mounting structure and may fix the battery to be measured 411 by a supporting or clamping method, such as using a tray, a gripper, etc. The battery to be measured 411 may be the battery cell 20 in the above embodiment, or may be a battery 100 including a plurality of battery cells 20.

[0113] The measurement-waiting battery 411 is configured to be positioned on a mounting surface, and the mounting surface is the surface where the mounting member 410 contacts the measurement-waiting battery 411, where the wide surface of the measurement-waiting battery 411 may be positioned to abut against the mounting surface, and the side surface of the measurement-waiting battery 411 may be positioned to abut against the mounting surface.

[0114] The mounting member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420. The radiation source 420 and the detector 430 can rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420.

[0115] By passing radiation 421 through battery-to-be-measured 411 at an angle θ, it is possible to reduce shielding between structures in battery-to-be-measured 411, allowing the cathode tab and the anode tab to be clearly photographed simultaneously in imaging. This shielding may be one of the tabs shielding another tab, or one of the tabs shielding another connecting member or adapter tab.

[0116] To ensure image detection quality, the detector 430 needs to be calibrated before each detection or every time the battery defect detection equipment 400 is turned on.

[0117] Rotation of the mounting member 410 along a predetermined rotation axis or rotation of the source 420 and the detector 430 along a predetermined rotation axis may be achieved by employing a motorized rotation mechanism or a manual rotation mechanism. That is, the rotation mechanism may be motorized and controlled by an external program, or the rotation mechanism may be a purely manual rotation structure in which rotation is adjusted manually. As can be understood, any mechanism that can be mounted on a rotating body (the mounting member or the combination of the source and detector) and can rotate the rotating body can be recognized as a rotation mechanism in this application.

[0118] According to the needs of different detection scenarios, the relative angle between the battery to be measured 411 and the radiation emitted from the radiation source 420 can be flexibly adjusted, which can reduce the shielding between the structures inside the battery to a certain extent and allow the structures inside the battery to be clearly photographed simultaneously during imaging. This can to some extent alleviate the problem of some of the internal structures of the battery being blurred due to the fixed imaging angle, improve the quality of the detection image, and further improve the accuracy of image identification.

[0119] According to some embodiments of the present application, the surface of the measurement-ready battery 411 includes an end face, and the optical axis X of the radiation 421 emitted from the radiation source 420 is obliquely projected onto the surface of the measurement-ready battery 411 to form at least one angle between the end face and a plane on which the detector 430 is located, and this angle is configured such that the cathode tab of the measurement-ready battery 411 is offset from the projection formed on the plane on which the anode tab is located based on the radiation projected onto the cathode tab, or the area of ​​the overlapping region between the two is smaller than a preset value.

[0120] The compaction density of copper is relatively high, while the compaction density of aluminum is relatively low. As a result, the grayscale value of the copper tab (anode tab) in the imaging is relatively large compared to that of the aluminum tab (cathode tab). Therefore, when detecting vertically, if the copper tab side is closer to the radiation source, its magnification becomes large. As a result, the copper tab (anode tab) in the imaging blocks most of the aluminum tab (cathode tab), causing blurring in the imaging of the cathode tab.

[0121] Therefore, by moving one side of the cathode tab of the battery to be measured 411 closer to the radiation source than one side of the anode tab during rotation, the cathode tab of the battery to be measured is positioned so that the projection formed on the plane where the anode tab is located based on the radiation projected onto the cathode tab is offset from the area where the anode tab is located, thereby reducing the shielding of the cathode tab by the anode tab in imaging, and thereby improving the imaging clarity of the cathode tab to some extent.

[0122] By adjusting the angle between the end face of the battery to be measured 411 and the plane on which the detector 430 is located, the cathode tab and the anode tab can be at least partially offset in the imaging direction, thereby reducing the shielding of one by the other and improving the imaging clarity of both to a certain extent, further improving the accuracy of image identification and increasing the efficiency of spot inspection of detected images.

[0123] According to some embodiments of the present application, the surface of the battery-to-be-measured 411 includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery-to-be-measured 411 .

[0124] The measurement-ready battery 411 is placed on a placement surface, and the placement surface is the surface where the placement member 410 comes into contact with the measurement-ready battery 411. The side surface of the measurement-ready battery 411 is the wide surface of the measurement-ready battery 411.

[0125] The mounting member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420. The radiation source 420 and the detector 430 can also rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery 411 to be measured placed on the mounting member 410 and the optical axis X of the radiation 421 emitted from the radiation source 420.

[0126] The preset rotation axis is perpendicular to the rotation plane, and if the preset rotation axis is not perpendicular to the mounting surface, an angle will exist between the rotation plane and the mounting surface, and there is a possibility that the mounting member 410 will block radiation 421 emitted from the radiation source 420 during the rotation process of the rotation mechanism.

[0127] The preset rotation axis is perpendicular to the wide surface of the battery to be measured 411, and the wide surface of the battery is always in the same plane during the rotation process, which improves the consistency and stability of the imaging after rotation and thereby enhances the detection effect. Also, by presetting the rotation axis perpendicular to the mounting surface, the rotation process is centered on the center of the battery to be measured 411, and more radiation passes through the measured surface of the battery to be measured 411 to some extent, thereby improving the detection effect.

[0128] According to some embodiments of the present application, the optical axis X of the radiation 421 emanating from the source 420 is projected obliquely onto the middle region of the end face of the cell-to-be-measured 411 .

[0129] The mounting surface includes an intermediate region and an edge region surrounding the intermediate region, and if the mounting surface is a centrosymmetric graphic, the intermediate region of the mounting surface may be the geometric center of the mounting surface, or the intermediate region of the mounting surface may be a single region diverging from this geometric center toward the edge region.

[0130] When radiation 421 emitted from radiation source 420 strikes the battery end face from the edge toward the center of the battery, the tab compaction density increases and the grayscale value in the image becomes darker, making it more difficult to detect the tab shape. At this time, the tab approaches the central region of the battery in the image and is shielded by structures such as the top cover adapter tab of the battery core, making the image of the tab structure more blurred. Therefore, it is necessary to bring the optical axis X of radiation 421 emitted from radiation source 420 as close as possible to the center of the end face of the battery to be measured, so that more radiation 421 passes through the center of the end face of the battery to be measured and improve the clarity of the image of the tab structure.

[0131] Since the projection of the central region of the end face of the battery 411 to be measured on the mounting surface is located in the central region of the mounting surface, when the radiation 421 emitted from the radiation source 420 is projected onto the middle region of the mounting surface, the radiation impinges from the middle region of the battery end face towards the edge region of the battery, which can reduce the obstruction of the imaging of the tab by the top cover adapter tab of the battery core to a certain extent, make the imaging of the tab shape clearer, and further improve the accuracy of image identification to a certain extent.

[0132] According to some embodiments of the present application, the distance between the source 420 and the detector 430 and / or the distance between the mounting member 410 and the source 420 in a direction perpendicular to the plane of the detector 430 is adjusted.

[0133] Based on the principle of similar triangles, the magnification factor of the detection device is related to the distance between the radiation source 420 and the detector 430 and / or the distance between the mounting member 410 and the radiation source 420. If the magnification factor is too small, the magnification effect cannot be fully realized; if the magnification factor is too large, the initial image may not be clear enough, which may affect the detection effect.

[0134] By adjusting the distance between the source 420 and the detector 430 and / or the distance between the mounting member 410 and the source 420, the magnification factor of the detection device can be controlled, so that the initial image can have a magnification effect, and at the same time, the imaging quality can be adjusted to a certain extent.

[0135] At the same time, the size of the radiation surface irradiated on the surface of the battery 411 waiting to be measured can also be controlled. When the distance between the radiation source 420 and the mounting member 410 is relatively small, the radiation surface on the surface of the battery waiting to be measured is also relatively small, and only a portion of the battery is irradiated by radiation, which can improve the detection effect of local details to a certain extent. When the distance between the radiation source 420 and the mounting member 410 increases, the radiation surface on the surface of the battery waiting to be measured also increases relatively, thereby covering a larger detection surface and reducing the possibility of missed inspections to a certain extent.

[0136] According to some embodiments of the present application, in response to a failure in the detection result of the battery to be measured, the battery to be measured is excluded or retested.

[0137] If the detected tabs on the initial image of the detected battery tend to be inserted downwards, or if the detected tabs have already been inserted downwards into the electrode plates, the tab shape of the battery to be measured is deemed to be unacceptable, and the battery to be measured is a risk product and needs to be excluded or re-inspected.

[0138] By outputting the detection result of the battery to be measured based on the initial image, automatic detection of defects inside the battery to be measured can be realized, and the automation degree and detection efficiency of the battery detection equipment can be improved.

[0139] 8, which is a structural block diagram of a battery defect detection apparatus 500 according to some embodiments of the present application. An embodiment of a third aspect of the present application provides a battery defect detection apparatus, the apparatus including an adjustment module 501 and an acquisition module 502, wherein the adjustment module 501 is configured to adjust an angle between an end face of the battery to be measured 411 and a plane on which the detector 430 is located in response to the battery to be measured 411 being placed on the mounting member 410, i.e., adjust the mounting member 410 along a predetermined rotation axis, or adjust the radiation source 420 and the detector 430 along the predetermined rotation axes, so that an optical axis X of the radiation 421 emitted from the radiation source 420 is obliquely projected onto the surface of the battery to be measured 411, and the acquisition module 502 is configured to acquire an initial image of the battery to be measured 411 for defect detection, which is obtained by the detector 430 receiving the radiation transmitted through the battery to be measured 411.

[0140] According to some embodiments of the present application, the relative angle between the battery to be measured and the radiation emitted from the radiation source can be flexibly adjusted according to the needs of different detection scenarios, so that the shielding between the structures inside the battery can be reduced to a certain extent, and the structures inside the battery can be clearly photographed simultaneously to a certain extent during imaging, which can to a certain extent alleviate the problem that the imaging of some internal structures of the battery is blurred due to the fixed imaging angle, improve the quality of the detection image, and further improve the accuracy of image identification to a certain extent.

[0141] According to some embodiments of the present application, the battery defect detection apparatus 500 further includes a detection module 503, which is configured to perform defect detection on the to-be-measured battery based on the initial image.

[0142] The detection module 503 is installed to receive the initial image generated by the detector, identify the detected image, and output the detection result of the battery to be measured, thereby realizing the detection of defects inside the battery to be measured, and improving the automation degree and detection efficiency of the battery defect detection device.

[0143] An embodiment of a 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 executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform any one of the battery defect detection methods in the above embodiments.

[0144] Referring to FIG. 9, FIG. 9 is a structural block diagram of an electronic device 600 according to some embodiments of the present application, which may be used as an example of a hardware device for each aspect of the present application. The electronic device is intended to represent various types of digital electronic computing devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various types of mobile devices, such as personal digital assistants, mobile phones, smartphones, wearable devices, and other similar computing devices. The components, their connections and relationships, and their functions shown herein are merely examples and are not intended to limit the implementation of the present application as described and / or claimed herein.

[0145] 9, the device 600 includes a computing unit 601, which can perform various appropriate operations and processes based on a computer program stored in a read-only memory (ROM) 602 or loaded from a storage unit 608 into a random access memory (RAM) 603. The RAM 603 may store various programs and data necessary for the operation of the device 600. 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.

[0146] The components of device 600 are connected to I / O interface 605 and include input unit 606, output unit 607, storage unit 608, and communication unit 609. Input unit 606 may be any type of device capable of inputting information into device 600. Input unit 606 can receive input numeric or character information and generate key signal input for user settings and / or function control of the electronic device, and may include, but is not limited to, a mouse, keyboard, touchscreen, trackpad, trackball, joystick, microphone, and / or remote control. Output unit 607 may be any type of device capable of presenting information, and may include, but is not limited to, a display, speaker, video / audio output terminal, vibrator, and / or printer. Storage unit 608 may include, but is not limited to, a magnetic disk, an optical disk, etc. The communications unit 609 allows the device 600 to exchange information / data with other devices, for example, via the Internet computer network and / or various telecommunications networks, and may include, but is not limited to, a modem, a network card, an infrared communications device, a wireless communications transceiver and / or a chipset, for example, a Bluetooth device, an 802.11 device, a WiFi device, a WiMax device, a cellular communications device and / or the like.

[0147] The computing unit 601 may be any of a variety of general-purpose and / or special-purpose processing assemblies having 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, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 601 performs each of the methods and processes described above. For example, in some embodiments, any one of the battery defect detection methods described above may be implemented as a computer software program tangibly contained in a machine-readable medium, such as the storage unit 808. In some embodiments, some 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, it may perform one or more steps of any one of the battery defect detection methods described above. Alternatively, in other embodiments, the computing unit 801 may be configured to perform any one of the battery defect detection methods in the above embodiments in any other suitable manner (eg, by firmware).

[0148] A machine-readable medium may be a tangible medium that may contain or store a program for use by or in connection with an instruction execution system, device, or apparatus. 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, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples of machine-readable storage media include one or more wire-based electrical connections, 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), 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 above.

[0149] According to some embodiments of the present application, as shown in Figures 5 to 7, an embodiment of the present application provides a battery defect detection device 400, which includes a radiation source 420, a detector 430, and a mounting member 410 located between the radiation source 420 and the detector 430, the mounting member 410 is used to mount a battery 411 to be measured, the mounting member 410 includes a mounting surface, and the battery 411 to be measured is configured to be positioned on the mounting surface. The battery defect detection equipment 400 further includes a rotation mechanism, which, as shown in FIG. 4, is configured to rotate the mounting member 410 along a predetermined rotation axis, or, as shown in FIG. 5, is configured to rotate the radiation source 420 and the detector 430 along a predetermined rotation axis to project the optical axis X of the radiation 421 emitted from the radiation source 420 obliquely onto the surface of the battery to be measured 411, and the detector 430 is configured to receive the radiation 421 that has passed through the battery to be measured 411 and obtain an initial image for defect detection of the battery to be measured 411.

[0150] The method for the battery fault detection device 400 to perform battery fault detection includes the following steps.

[0151] Step S101: In response to the battery 411 waiting for measurement being placed on the mounting member 410, Step S102: Rotate the mounting member 410 along a preset rotation axis, or rotate the radiation source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the radiation 421 emitted from the radiation source 420 is obliquely projected onto the surface of the measurement-ready battery 411; Step S103: The detector 430 receives radiation that has passed through the measurement-awaiting battery 411, and obtains an initial image for defect detection of the measurement-awaiting battery 411.

[0152] 10 and 11, FIG. 10 is a detected image of a battery waiting to be measured according to some embodiments of the present application, and FIG. 11 is a detected image of a battery waiting to be measured according to some embodiments of the present application.

[0153] The compaction density of copper is relatively large, while the compaction density of aluminum is relatively small. As a result, the grayscale value in the imaging of the copper tab (anode tab) is relatively large compared to that of the aluminum tab (cathode tab). Therefore, when detecting vertically, if the copper tab side is closer to the radiation source, its magnification will be large. As a result, the copper tab (anode tab) in the imaging will shield most of the aluminum tab (cathode tab), causing blurring in the imaging of the cathode tab.

[0154] Therefore, by moving one side of the cathode tab of the battery to be measured 411 closer to the radiation source than the one side of the anode tab during rotation, the projection of the cathode tab of the battery to be measured on the plane where the anode tab is located based on the radiation projected onto the cathode tab is offset from the area where the anode tab is located, thereby reducing the shielding of the cathode tab from the imaging of the anode tab. As shown in Figure 10, the detected image includes a first area 4111 for imaging the anode tab and a second area 4112 for imaging the cathode tab. By adjusting the first relative angle between the battery to be measured 411 and the radiation emitted from the radiation source 420, the imaging of the cathode tab on the right side becomes clearer. As shown in FIG. 11, the detection image includes a first area 4111 of imaging the anode tab and a second area 4112 of imaging the cathode tab, and by adjusting the second relative angle between the battery waiting to be measured 411 and the radiation emitted from the source 420, the imaging of the cathode tab on the left side also becomes clearer, thereby improving the imaging clarity of the cathode tab to a certain extent.

[0155] Finally, it should be noted that the above examples are merely for the purpose of illustrating the technical solutions of the present application and are not intended to limit the same. Although the present application has been described in detail with reference to the above examples, those skilled in the art may still modify the technical solutions described in the above examples or make equivalent substitutions for some or all of the technical features therein. However, it should be understood that such modifications or substitutions do not deviate from the essence of the relevant technical solutions from the scope of the technical solutions of the examples of the present application, and all such modifications or substitutions should be included within the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the examples can be combined in any manner. The present application is not limited to the specific examples disclosed herein, but includes all technical solutions included within the scope of the claims.

Claims

1. A battery defect detection device, comprising: A radiation source; A detector; a mounting member positioned between the radiation source and the detector for mounting a battery to be measured, the mounting member including a mounting surface, the battery to be measured being configured to be positioned on the mounting surface; A battery defect detection device comprising: a rotation mechanism configured to rotate the mounting member along a predetermined rotation axis, or configured to rotate the radiation source and the detector along a predetermined rotation axis so that the optical axis of the radiation emitted from the radiation source is projected obliquely onto the surface of the battery to be measured, wherein the detector is configured to receive radiation that has passed through the battery to be measured and obtain an initial image for performing defect detection on the battery to be measured.

2. The apparatus of claim 1 , further comprising a defect detection unit connected to the detector, the defect detection unit configured to perform defect detection on the to-be-measured battery based on the initial image.

3. the battery to be measured includes an end surface, the end surface being a flat surface on which a battery end cap is located; a projection of an intermediate region of an end surface of the battery waiting to be measured onto the mounting surface along a direction perpendicular to the mounting surface is located within the intermediate region of the mounting surface; 3. The device according to claim 1 or 2, wherein the radiation emitted from the radiation source is projected obliquely onto at least a middle region of an end face of the battery to be measured.

4. The device according to claim 1 , wherein the preset rotation axis is perpendicular to the placement surface.

5. The device according to claim 1 , wherein the predetermined rotation axis is drilled in a middle region of the placement surface.

6. the battery to be measured includes an end surface, the end surface being a flat surface on which a battery end cap is located; 6. The device according to claim 1, wherein the angle α between the end face and a plane on which the detector is located satisfies 0°≦α≦45°.

7. 7. The device of claim 1, further comprising a first adjustment structure, wherein the first adjustment mechanism is connected to the mounting member and configured to drive the mounting member to move to adjust the distance between the mounting member and the radiation source.

8. further comprising a second adjustment mechanism connected to the source and configured to drive the source to move and adjust the distance between the source and the detector; or 8. The apparatus of claim 1, wherein the second adjustment mechanism is connected to the detector and configured to drive the detector to move to adjust the distance between the source and the detector.

9. The rated voltage V of the radiation source satisfies 130 kV≦V≦150 kV, and / or 9. The device according to claim 1, wherein the rated current I of the radiation source satisfies I≦500 μA.

10. A method for detecting a battery defect using the battery defect detection device according to any one of claims 1 to 9, comprising: Responding to a battery to be measured being placed on a mounting member; rotating the mounting member along a predetermined rotation axis, or rotating the radiation source and the detector along a predetermined rotation axis, so that the optical axis of the radiation emitted from the radiation source is projected obliquely onto the surface of the battery to be measured; and acquiring an initial image for defect detection of the battery to be measured, the initial image being obtained by the detector receiving radiation transmitted through the battery to be measured.

11. the battery to be measured includes an end surface, the end surface being a flat surface on which a battery end cap is located; The optical axis of the radiation emitted from the radiation source is obliquely projected onto the surface of the battery to be measured, and at least one angle is formed between the end face and a plane on which the detector is located, and the angle is:

11. The method according to claim 10, wherein the cathode tab of the battery to be measured is configured such that a projection formed on a plane on which the anode tab is located based on radiation projected onto the cathode tab and a region in which the anode tab is located are offset from each other, or an area of ​​an overlapping region between the projection and the region is smaller than a preset value.

12. The method according to claim 10 or 11, wherein the surface of the battery to be measured includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery to be measured.

13. the battery to be measured includes an end surface, the end surface being a flat surface on which a battery end cap is located; 13. The method according to claim 10, wherein the optical axis of the radiation emitted from the source is projected obliquely onto the intermediate region of the end face.

14. 14. The method according to claim 10, further comprising adjusting the distance between the source and the detector and / or the distance between the mounting member and the source in a direction perpendicular to a plane in which the detector is located.

15. The method according to claim 10 , further comprising excluding or retesting the battery to be measured in response to a failure of the detection result of the battery to be measured.

16. A battery defect detection device, comprising: an adjustment module configured to adjust the angle between the mounting surface of the mounting member and a plane on which the detector is located in response to the battery being placed on the mounting member, so that the optical axis of the radiation emitted from the radiation source is projected obliquely onto the surface of the battery being measured; and an acquisition module configured to acquire an initial image for performing defect detection on the battery to be measured, the initial image being obtained by the detector receiving radiation that has passed through the battery to be measured.

17. The device comprises: The apparatus of claim 16 , further comprising a detection module configured to perform defect detection on the to-be-measured battery based on the initial image.

18. at least one processor; a memory communicatively coupled to the at least one processor, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the battery defect detection method of any one of claims 10 to 15.

19. 16. A computer-readable storage medium having a computer program stored thereon, the computer program implementing the method for detecting a battery defect according to any one of claims 10 to 15 when executed by a processor.

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