Battery defect detection apparatus, method and device

Abstract

A battery defect detection apparatus (400), method and device (500), which belong to the technical field of batteries. The battery defect detection apparatus (400) comprises a ray source (420), a detector (430), and a bearing component (410) located between the ray source (420) and the detector (430), wherein a battery to be subjected to detection (411) is configured to be located on a bearing face of the bearing component (410). The battery defect detection apparatus (400) further comprises a rotating mechanism, wherein the rotating mechanism is configured to rotate the bearing component (410) along a preset rotation axis, or the rotating mechanism is configured to rotate the ray source (420) and the detector (430) along the preset rotation axis, such that an optical axis (X) of each of rays emitted by the ray source (420) is obliquely projected onto a surface of said battery (411). According to the requirements of different detection scenarios, at least an included angle (θ) between an end face of said battery (411) and a plane where the detector (430) is located can be flexibly adjusted, making various structures inside the battery be simultaneously clearly photographed to a certain extent during imaging.

Description

Battery defect detection equipment, method and device

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202310797731.2, filed on June 30, 2023, entitled “Battery Defect Detection Equipment, Method and Device,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery defect detection device, method and apparatus. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] During the battery production process, various internal defects can occur, impacting battery quality and safety. While manufacturers strive to improve battery production efficiency, they are also conducting more comprehensive testing for defects that may arise during manufacturing to ensure the safety of products entering the market. Related technologies for internal defect detection often suffer from unclear imaging of the battery's interior, making it impossible to identify defects and impacting battery reliability.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems in the background art. To this end, one purpose of the present application is to provide a battery defect detection device, method and apparatus to improve / alleviate / solve the problem of internal battery imaging clarity during detection.

[0008] An embodiment of the first aspect of the present application provides a battery defect detection device, including a radiation source, a detector, and a carrying component located between the radiation source and the detector, the carrying component being used to carry a battery to be tested, the carrying component including a carrying surface, and the battery to be tested being configured to be located on the carrying surface.

[0009] The battery defect detection equipment also includes a rotating mechanism, which is configured to rotate the supporting component along a preset axis, or the rotating mechanism is configured to rotate the radiation source and the detector along a preset axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested, and the detector is configured to receive the radiation that penetrates the battery to be tested to obtain an initial image, and the initial image is used to perform defect detection on the battery to be tested.

[0010] In the technical solution of the embodiment of the present application, the battery can be inspected by means of a ray source, a detector and a supporting component. By setting a rotating mechanism, the relative angle between the battery to be tested and the ray emitted by the ray source can be flexibly adjusted according to the requirements of different detection scenarios, which can reduce the obstruction between the various structures inside the battery to a certain extent, and to a certain extent, enable the various structures inside the battery to be clearly photographed simultaneously in the imaging. In some examples, to a certain extent, at least the cathode tab and the anode tab can be clearly photographed simultaneously in the imaging.

[0011] The rotating mechanism is configured to rotate the supporting component along a preset rotation axis, or the rotating mechanism is configured to rotate the radiation source and the detector along a preset rotation axis. Based on the above two adjustment methods, the angle between at least the end face of the battery to be tested and the plane where the detector is located is adjusted. This can improve to a certain extent the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle, improve the quality of the detection image, and thereby improve the accuracy of image recognition to a certain extent.

[0012] In some embodiments, the battery defect detection device further includes a defect detection unit connected to the detector. The defect detection unit is configured to perform defect detection on the battery under test based on the electrical signal or initial image generated by the detector. By configuring the defect detection unit to receive the electrical signal from the detector or the indirectly generated initial image and output the test results of the battery under test, automatic detection of internal defects in the battery under test can be achieved, thereby improving the automation level and detection efficiency of the battery testing device.

[0013] In some embodiments, the battery to be tested includes an end face, which is the plane where the battery end cap is located; along a direction perpendicular to the support surface, the projection of the middle area of ​​the end face of the battery to be tested onto the support surface is located within the middle area of ​​the support surface; and the rays emitted by the ray source are configured to be projected at least obliquely onto the middle area of ​​the end face of the battery to be tested. Because the projection of the center area of ​​the end face of the battery to be tested onto the support surface is located in the center area of ​​the support surface, when the rays emitted by the ray source are projected onto the battery to be tested, the rays can be directed from the middle area of ​​the battery to be tested toward the edge area of ​​the battery to be tested, thereby reducing to a certain extent the obstruction of the tab imaging by the cell top cover adapter, making the imaging of the tab morphology clearer, and thereby improving to a certain extent the accuracy of image recognition.

[0014] In some embodiments, the predetermined rotation axis is perpendicular to the supporting surface. When the supporting component is rotated along the predetermined rotation axis, or when the radiation source and detector are rotated along the predetermined rotation axis, the rotation occurs within the supporting surface, which can reduce the shielding of the radiation by the supporting surface to a certain extent and increase the stability of the rotation.

[0015] In some embodiments, the predetermined rotation axis is disposed at least through the middle region of the support surface. During rotation, the optical axis of the radiation emitted by the radiation source can be controlled to a certain extent so as to always be projected obliquely toward the middle region of the support surface, that is, toward the center region of the surface of the battery under test, thereby improving the consistency and stability of the test.

[0016] In some embodiments, the angle α between the end face of the battery under test and the plane of the detector satisfies the following conditions: 0°≤α≤45°. By adjusting the appropriate rotation angle, the imaging of the various internal structures of the battery can be made clearer, and the accuracy of detecting the shape of the two tabs inside the battery can be improved to at least a certain extent.

[0017] In some embodiments, the battery defect detection device further includes a first adjustment mechanism connected to the support member and configured to drive the support member to move to adjust the distance between the support 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 support member and the radiation source. If the magnification factor is too low, the magnification effect cannot be effectively achieved. If the magnification factor is too high, the detection image may be unclear, affecting the detection effect.

[0018] Therefore, the magnification of the detection device can be controlled by adjusting the distance between the supporting component and the radiation source, so that the initial image can be magnified while the imaging quality can be adjusted to a certain extent.

[0019] At the same time, the size of the radiation surface irradiated on the surface of the battery to be tested can also be controlled. When the distance between the radiation source and the supporting component is small, the radiation surface of the radiation on the surface of the battery to be tested is also relatively small, and only part of the battery area is irradiated by the radiation. Therefore, the detection effect of local details can be improved to a certain extent; when the distance between the radiation source and the supporting component increases, the radiation surface of the radiation on the surface of the battery to be tested is also relatively increased, thereby covering a larger detection area and reducing the possibility of missed detection to a certain extent.

[0020] In some embodiments, the battery defect detection device also includes a second adjustment structure, the second adjustment mechanism is connected to the radiation source, and is configured to drive the radiation source to move to adjust the distance between the radiation source and the detector, or the second adjustment mechanism is connected to the detector, and is configured to drive the detector to move to adjust the distance between the radiation source and the detector.

[0021] By adjusting the distance between the ray source and the detector, it is possible to adapt to different types of battery detection. At the same time, the magnification of the battery defect detection equipment is also related to the distance between the ray source and the detector. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear enough, affecting the detection effect. Therefore, the magnification of the battery defect detection equipment can be controlled by adjusting the distance between the ray source and the detector, so that the initial image can be magnified while the imaging quality can be adjusted to a certain extent.

[0022] In some embodiments, the rated voltage V of the radiation source satisfies the following conditions: 130 kV ≤ V ≤ 150 kV, and / or the rated current I of the radiation source satisfies the following conditions: I ≤ 500 μA. By setting the voltage and / or current value range, the radiation emitted by the radiation source can penetrate the battery tabs for detection without causing overexposure that could affect detection accuracy.

[0023] An embodiment of the second aspect of the present application provides a method for battery defect detection using a battery defect detection device according to any one of the above embodiments, comprising: in response to a battery to be tested being placed on a supporting component, rotating the supporting component along a preset rotation axis, or rotating the radiation source and the detector along a preset rotation axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested; and obtaining an initial image obtained by the detector by receiving radiation that penetrates the battery to be tested, the initial image being used for defect detection of the battery to be tested.

[0024] The relative angle between the battery under test and the radiation emitted by the radiation source can be flexibly adjusted to meet the needs of different detection scenarios. This can reduce the occlusion between the various internal structures of the battery to a certain extent and enable the various internal structures of the battery to be clearly captured simultaneously during imaging. This can also improve the image quality of the test image, thereby improving the accuracy of image recognition.

[0025] In some embodiments, the optical axis of the rays emitted by the ray source is adjusted to be projected obliquely onto the surface of the battery to be tested so as to form at least an angle between the end face of the battery to be tested and the plane where the detector is located, and the angle is configured to satisfy the projection of the cathode tab of the battery to be tested on the plane where the anode tab is located based on the rays projected onto the cathode tab, and the projection is staggered with the area where the anode tab is located or the area of ​​the overlapping area between the two is smaller than a preset value.

[0026] By adjusting the angle between the end face of the battery to be tested and the plane where the detector is located, the cathode tab and the anode tab can be at least partially offset in the imaging direction, thereby reducing the occlusion of one by the other, thereby improving the imaging clarity of the two to a certain extent, and then providing image recognition accuracy to improve the sampling efficiency of the detection image.

[0027] In some embodiments, the surface of the battery under test includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery under test. The side surface of the battery under test is also the large surface of the battery under test. The preset rotation axis is perpendicular to the large surface of the battery under test. During the rotation process, the large surface of the battery remains in the same plane, improving the consistency and stability of the image after rotation, thereby improving the detection effect.

[0028] In some embodiments, the optical axis of the ray emitted by the ray source is projected obliquely to the middle area of ​​the end face of the battery to be tested. Since the projection of the central area of ​​the end face of the battery to be tested on the supporting surface is located in the central area of ​​the supporting surface, that is, the central area of ​​the large surface of the battery to be tested is located in the central area of ​​the supporting surface, when the ray emitted by the ray source is projected to the middle area of ​​the end face of the battery to be tested, the ray can hit the edge area of ​​the battery from the middle area of ​​the end face of the battery, thereby reducing the obstruction of the imaging of the tab by the battery cell top cover adapter to a certain extent, making the imaging of the tab morphology clearer, and thereby improving the accuracy of image recognition to a certain extent.

[0029] In some embodiments, the distance between the ray source and the detector and / or the distance between the supporting component and the ray source is adjusted in a direction perpendicular to the plane of the detector.

[0030] According to the principle of similar triangles, the magnification of battery defect detection equipment is related to the distance between the radiation source and the detector and / or the distance between the support component and the radiation source. If the magnification is too small, the magnification effect cannot be achieved effectively. If the magnification is too large, the initial image may not be clear, affecting the detection effect. Therefore, the magnification of the detection equipment can be controlled by adjusting the distance between the radiation source and the detector and / or the distance between the support component and the radiation source. This can achieve a magnified initial image while also adjusting the image quality to a certain extent.

[0031] At the same time, the size of the radiation surface irradiated on the surface of the battery to be tested can also be controlled. When the distance between the radiation source and the supporting component is small, the radiation surface of the radiation on the surface of the battery to be tested is also relatively small, and only part of the battery area is irradiated, which can improve the detection effect of local details to a certain extent; when the distance between the radiation source and the supporting component increases, the radiation surface of the radiation on the surface of the battery to be tested is also relatively increased, thereby covering a larger detection area and reducing the possibility of missed detection to a certain extent.

[0032] In some embodiments, in response to a test result of the battery to be tested being unqualified, the battery to be tested is rejected or retested.

[0033] An embodiment of the third aspect of the present application provides a battery defect detection device, which includes an adjustment module and an acquisition module, wherein the adjustment module is configured to adjust the supporting component along a preset rotation axis in response to the battery to be tested being placed on the supporting component, or adjust the radiation source and the detector along the preset rotation axis, so that the optical axis of the radiation emitted by the radiation source is projected obliquely onto the surface of the battery to be tested; the acquisition module is configured to acquire an initial image obtained by the detector by receiving radiation penetrating the battery to be tested, and the initial image is used for defect detection of the battery to be tested.

[0034] The relative angle between the battery under test and the radiation emitted by the radiation source can be flexibly adjusted to meet the needs of different detection scenarios. This can reduce the occlusion between the various internal structures of the battery to a certain extent and enable the various internal structures of the battery to be clearly captured simultaneously during imaging. This can also improve the image quality of the test image, thereby improving the accuracy of image recognition.

[0035] In some embodiments, the battery defect detection apparatus further includes a detection module configured to perform defect detection on the battery under test based on the initial image. By configuring the detection module to receive the initial image generated by the detector and identify the detected image to output a test result for the battery under test, internal defects in the battery under test can be detected, thereby improving the automation and detection efficiency of the battery defect detection apparatus.

[0036] An embodiment of the fourth aspect of the present application provides an electronic device, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the battery defect detection method of any one of the above embodiments.

[0037] An embodiment of the fifth aspect of the present application provides a battery defect detection device, which includes the electronic device in the above embodiment.

[0038] An embodiment of the sixth aspect of the present application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery defect detection method of any one of the above embodiments.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without paying creative work.

[0041] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0042] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0043] FIG3 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0044] FIG4 is a schematic diagram of the structure of a battery defect detection device provided in some embodiments of the present application;

[0045] FIG5 is a schematic diagram of the structure of a battery defect detection device provided in some embodiments of the present application;

[0046] FIG6 is a schematic diagram of the structure of a battery defect detection device provided in some embodiments of the present application;

[0047] FIG7 is a flowchart of a method for detecting battery defects according to some embodiments of the present application;

[0048] FIG8 is a structural block diagram of a battery defect detection device provided by some embodiments of the present application;

[0049] FIG9 is a structural block diagram of an electronic device provided in some embodiments of the present application;

[0050] FIG10 is a detection image of a battery under test provided by some embodiments of the present application;

[0051] FIG11 is a detection image of a battery to be tested provided in some embodiments of the present application. DETAILED DESCRIPTION

[0052] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0054] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0055] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0060] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0061] The applicant has noted that defects may occur in batteries during production and use. For example, during the production process, defects such as tab folding or tab breakage may occur. Defective batteries need to be removed to avoid affecting the battery's reliability to a certain extent. The distance between the cathode and cathode plates and the misalignment of the cathode and cathode plates within the battery are also important factors affecting the battery's safety performance. Regarding the distance between the cathode and cathode plates: During the charge and discharge process of a lithium battery, when the distance between the cathode and cathode plates is large, lithium ions cannot be fully embedded in the anode channel, resulting in the accumulation of some lithium ions and the occurrence of lithium plating, which poses a greater safety risk. Therefore, it is required that the distance between the cathode and cathode plates within the battery should not be too large. Regarding the misalignment of the cathode and cathode plates: During the charge and discharge process of a lithium battery, lithium ions will repeatedly embed and deintercalate between the cathode and cathode plates. However, when lithium ions are released from the cathode but do not have enough anode channels to embed, lithium ions can easily accumulate and deposit lithium, causing certain product safety risks. Therefore, it is necessary to ensure that the cathode plate is entirely within the coverage of the anode, that is, to ensure that the anode exceeds the cathode, that is, the misalignment of the cathode and cathode must be greater than 0. Therefore, it is necessary to inspect the internal spacing of the battery and the misalignment of the cathode and anode plates to promptly detect internal defects and reduce the outflow of defective batteries. However, these defects cannot be observed from the outside of the battery, so internal inspection of the battery is required to determine whether the above defects exist by examining the tab morphology.

[0062] Based on the above considerations, to address the issue of insufficient accuracy in battery internal defect detection, ray projection detection can be used to achieve non-destructive detection of the battery's interior. By placing the battery under test between a ray source and a detector, the rays emitted by the ray source penetrate the battery and are received by the detector, thereby obtaining information on the position and status of the battery's cathode and anode, and further detecting various defects within the battery.

[0063] The flat panel detectors, battery testing devices, and battery production equipment disclosed in the embodiments of this application can be used in battery production and manufacturing. The battery cells tested or produced can be used, but are not limited to, in electrical devices such as vehicles, ships, and aircraft. Such electrical devices can be equipped with power supply systems comprising the battery cells and batteries disclosed in this application.

[0064] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0065] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0066] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0067] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0068] Please refer to Figure 2, which is a schematic diagram of the exploded structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides a storage space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cells 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. Alternatively, the first portion 11 and the second portion 12 can each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder or a rectangular parallelepiped.

[0069] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0070] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0071] Please refer to Figure 3, which is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. As shown in Figure 3, a battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

[0072] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to match the housing 22. In some embodiments, the end cap 21 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 21 from deforming when subjected to compression or collision, giving the battery cell 20 greater structural strength and improved safety. The end cap 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect to the battery cell assembly 23 to output or input electrical energy to the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any specific limitations on this. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0073] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the battery cell assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the battery cell assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any specific limitations on this.

[0074] The cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more cell assemblies 23 may be contained in the shell 22. The cell assembly 23 is mainly formed by winding or stacking cathode sheets and anode sheets, and a separator is usually provided between the cathode sheets and the anode sheets. The parts of the cathode sheets and the anode sheets with active substances constitute the main body of the cell assembly, and the parts of the cathode sheets and the anode sheets without active substances each constitute a tab 23a. The cathode tab and the anode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the cathode active substance and the anode active substance react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0075] Please refer to Figures 4-5. Figure 4 is a schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application, and Figure 5 is a schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application. The present application provides a battery defect detection device 400, which includes a radiation source 420, a detector 430, and a supporting member 410 located between the radiation source 420 and the detector 430. The supporting member 410 is used to support a battery 411 to be tested. The supporting member 410 includes a supporting surface, and the battery 411 to be tested is configured to be located on the supporting surface. The battery defect detection equipment 400 also includes a rotation mechanism (not shown in the figure). As shown in Figure 4, the rotation mechanism is configured to rotate the supporting component 410 along a preset rotation axis, or as shown in Figure 5, the rotation mechanism is configured to rotate the ray source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the ray 421 emitted by the ray source 420 is projected obliquely onto the surface of the battery to be tested 411, and the detector 430 is configured to receive the ray 421 that penetrates the battery to be tested 411 to obtain an initial image, and the initial image is used to perform defect detection on the battery to be tested 411.

[0076] The supporting member 410 may be any supporting structure that can support or clamp the battery 411 under test, such as a tray, clamps, etc. The battery 411 under test may be the battery cell 20 in the above embodiment, or a battery 100 including multiple battery cells 20 .

[0077] The battery under test 411 is configured to be located on the supporting surface, which is the surface of the supporting component 410 that contacts the battery under test 411 , wherein the larger surface of the battery under test 411 may be configured to abut against the supporting surface.

[0078] The ray source 420 is a device for emitting rays, mainly including a ray tube and a corresponding power supply. The ray 421 can be X-rays or other rays. The ray tube can emit corresponding detection rays, such as an X-ray tube or a gamma-ray tube. The ray source 420 can be open (open tube) or closed (closed tube). In one example, the ray source 420 is an X-ray source, and the ray 421 it emits is an X-ray. When the ray 421 emitted by the ray source 420 passes through the battery to be tested 411, the optical axis X of the ray 421 emitted by the ray source 420 is projected obliquely onto the surface of the battery to be tested 411, wherein the surface of the battery to be tested 411 can be the end face of the battery to be tested 411, and the surface of the battery to be tested 411 can also include other surfaces of the battery to be tested 411 except the end face, wherein the end face of the battery to be tested 411 can be the plane where the end cover 21 in the above embodiment is located.

[0079] The optical axis X of the ray 421 emitted by the ray source 420 forms an angle θ with at least one end face of the battery under test 411. Due to the existence of this angle θ, the occlusion between the various internal structures of the battery under test 411 is reduced. The optical axis X of the ray 421 can be the central axis of multiple rays 421 or the axis of symmetry of the rays emitted by the ray source 420.

[0080] The detector 430 is a two-dimensional flat panel detector, and the detector 430 may be an indirect flat panel detector.

[0081] As shown in FIG4 , the support member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery 411 under test supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420. This allows the ray 421 to pass through the battery 411 under test at an angle θ, thereby reducing obstructions between the various structures in the battery 411 under test, so that the cathode and anode tabs can be clearly captured simultaneously in the image. The obstruction can be from one tab to the other, or from other connectors or adapters to either tab.

[0082] As shown in FIG5 , 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 under test, which is supported on the supporting component 410, and the optical axis X of the radiation 421 emitted by the radiation source 420. This allows the radiation 421 to pass through the battery 411 under test at an angle θ, thereby reducing the obstruction between the various structures in the battery 411 under test, so that the cathode and anode tabs can be clearly captured simultaneously in the image. The obstruction can be from one tab to the other, or from other connectors or adapters to either tab.

[0083] Based on the different rotating bodies (the bearing components or the combination of the radiation source and the detector) rotated by the rotating mechanism, the positions of the preset rotating axes may be the same or different.

[0084] The rotating mechanism can be electrically operated and controlled by an external program, or it can be a purely manual rotating structure with manual rotation adjustment. It is understood that any mechanism that can be installed on a rotating body (a load-bearing component or a combination of a radiation source and a detector) and can drive the rotating body to rotate can be considered a rotating mechanism in this application.

[0085] In the technical solution of the embodiment of the present application, the battery 411 to be tested can be tested using a radiation source 420, a detector 430, and a carrier 410. By providing a rotation mechanism, the angle θ between the end face of the battery 411 to be tested and the plane of the detector 430 can be flexibly adjusted according to the requirements of different detection scenarios. This can reduce the obstruction between the various internal structures of the battery to a certain extent and enable the various internal structures of the battery to be clearly captured simultaneously in the imaging to a certain extent. In some examples, at least the cathode tab and the anode tab can be clearly captured simultaneously in the imaging to a certain extent.

[0086] The rotation mechanism is configured to rotate the supporting component 410 along a preset rotation axis, or the rotation mechanism is configured to rotate the radiation source 420 and the detector 430 along a preset rotation axis. Based on the above two adjustment methods, the angle θ between at least the end face of the battery to be tested 411 and the plane where the detector 430 is located is adjusted. This can improve to a certain extent the problem of unclear imaging of some internal structures of the battery due to the fixed imaging angle, improve the quality of the detection image, and thereby improve the accuracy of image recognition to a certain extent.

[0087] According to some embodiments of the present application, the battery defect detection device 400 further includes a defect detection unit 440 connected to the detector 430 , and the defect detection unit 440 is configured to perform defect detection on the battery to be tested 411 based on the initial image.

[0088] The defect detection unit 440 may be any computer device or a processor built into the battery defect detection apparatus 400 .

[0089] The initial image can be directly acquired by the detector 430 , or can be converted by the electrical signal generated by the detector 430 to obtain a restored image of the object being measured.

[0090] The defect detection unit 440 may also preset a corresponding image recognition algorithm, obtain a corresponding detection result by recognizing the initial image, and determine whether the battery to be tested 411 has an abnormality based on the detection result.

[0091] By setting up a defect detection unit 440 to receive the electrical signal of the detector 430 or the initial image generated indirectly, and outputting the detection result of the battery to be tested 411, automatic detection of internal defects of the battery to be tested 411 can be achieved, thereby improving the degree of automation and detection efficiency of the battery detection equipment.

[0092] According to some embodiments of the present application, the battery to be tested 411 includes an end face, which is the plane where the battery end cover is located; along the direction perpendicular to the supporting surface, the projection of the middle area of ​​the end face of the battery to be tested 411 on the supporting surface is located within the middle area of ​​the supporting surface; the ray 421 emitted by the ray source 420 is configured to be projected at least obliquely to the middle area of ​​the end face of the battery to be tested 411.

[0093] The bearing surface includes a middle area and an edge area surrounding the middle area. When the bearing surface is a centrally symmetrical figure, the middle area of ​​the bearing surface can be the geometric center of the bearing surface, or the middle area of ​​the bearing surface can be an area that diffuses from the geometric center to the edge area.

[0094] The battery 411 to be tested is configured to be located on a supporting surface, which is the surface of the supporting component 410 that contacts the battery 411 to be tested. The supporting surface may be the surface where the large surface of the battery 411 to be tested abuts the supporting surface, or the side surface of the battery 411 to be tested abuts the supporting surface. When the large surface of the battery 411 to be tested abuts the supporting surface, the middle area of ​​the battery 411 to be tested is located in the middle area of ​​the supporting surface. As a feasible embodiment, the battery 411 to be tested is placed on the supporting surface in a manner that is at least centered.

[0095] If the ray 421 emitted by the ray source 420 strikes the center of the battery from the edge of the end face, the tab's compaction density is greater, resulting in a darker grayscale value in the image, making the tab's shape more difficult to detect. In this case, the tab is closer to the center of the battery and is obscured by structures such as the cell top cover adapter, making the image of the tab structure more blurred. Therefore, it is necessary to position the optical axis X of the ray 421 emitted by the ray source 420 as close as possible to the center of the battery end face to be tested, so that more rays 421 pass through the center of the battery end face to be tested, thereby improving the clarity of the tab structure image.

[0096] Since the projection of the center area of ​​the end face of the battery 411 to be tested on the supporting surface is located in the center area of ​​the supporting surface, when the optical axis of the ray emitted by the ray source 420 is projected above the middle area of ​​the supporting surface, the ray can be shot from the middle area of ​​the end face of the battery 411 to be tested to the edge of the battery 411 to be tested, thereby reducing the obstruction of the imaging of the tab by the battery cell top cover adapter to a certain extent, making the imaging of the tab morphology clearer, thereby improving the accuracy of image recognition to a certain extent.

[0097] According to some embodiments of the present application, the preset rotation axis is perpendicular to the bearing surface.

[0098] The battery under test 411 is configured to be located on a carrying surface, which is a surface of the carrying component 410 that contacts the battery under test 411 .

[0099] The support member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 can also rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0100] The preset rotation axis is perpendicular to the rotation plane. When the preset rotation axis is not perpendicular to the bearing surface, there is an angle between the rotation plane and the bearing surface, which may cause the bearing component 410 to block the rays 421 emitted by the ray source 420 during the rotation of the rotating mechanism.

[0101] When the bearing component 410 is rotated along the preset rotation axis, or when the ray source 420 and the detector 430 are rotated along the preset rotation axis, they all rotate within the bearing surface, which can reduce the shielding of the ray 421 by the bearing surface to a certain extent and increase the stability of the rotation.

[0102] According to some embodiments of the present application, the preset rotating shaft is at least disposed through the middle area of ​​the bearing surface.

[0103] The bearing surface includes a middle area and an edge area surrounding the middle area. When the bearing surface is a centrally symmetrical figure, the middle area of ​​the bearing surface can be the geometric center of the bearing surface, or the middle area of ​​the bearing surface can be an area that diffuses from the geometric center to the edge area.

[0104] The support member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 can also rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0105] When the preset rotation axes W1 and W2 are located in the central area of ​​the carrying surface, since the projection of the middle area of ​​the end surface of the battery 411 to be tested on the carrying surface is located in the middle area of ​​the carrying surface, no matter how the rotating body of the rotating mechanism (the carrying component or the combination of the radiation source and the detector) rotates, most of the rays 421 of the radiation source 420 will pass through the middle area of ​​the end surface of the battery 411 to be tested.

[0106] That is, during the rotation process, most of the rays 421 emitted by the ray source 420 can be controlled to a certain extent to always be projected obliquely to the middle area of ​​the bearing surface, that is, to the center area of ​​the end face of the battery to be tested 411, thereby improving the consistency and stability of the detection.

[0107] According to some embodiments of the present application, the surface of the battery to be tested 411 includes an end face, and the angle α between the end face of the battery to be tested 411 and the plane where the detector 430 is located satisfies: 0°≤α≤45°

[0108] The end surface of the battery to be tested 411 may be the plane where the end cover 21 in the above embodiment is located.

[0109] Due to the positional relationship between the ray source 420 and the detector 430, the optical axis X of the ray 421 of the ray source 420 is usually perpendicular to the plane where the detector 430 is located. Therefore, the relationship between the angle α between the end face of the battery 411 to be tested and the plane where the detector 430 is located and the angle θ between the end face of the battery 411 to be tested and the optical axis X of the ray 421 emitted by the ray source 420 satisfies: α + θ = 90°

[0110] By adjusting the reasonable rotation angle, the imaging between the various structures inside the battery can be made clearer, and the detection accuracy of the two tab shapes inside the battery can be improved to at least a certain extent.

[0111] Please refer to Figure 6, which is a schematic diagram of the structure of a battery defect detection device 400 provided in some embodiments of the present application. According to some embodiments of the present application, the battery defect detection device 400 also includes a first adjustment structure (not shown in the figure). The first adjustment mechanism is connected to the support member 410 and is configured to drive the support member 410 to move to adjust the distance L1 between the support member 410 and the radiation source 420.

[0112] Based on the principle of similar triangles, the magnification of battery defect detection equipment 400 is related to the distance L1 between support member 410 and radiation source 420. L1 can be the distance between the reference plane of radiation source 420 and the reference plane of support member 410. Depending on actual measurement needs, the reference plane can be a plane selected on radiation source 420 or support member 410. To facilitate the measurement of L1, the two reference planes can be parallel to each other.

[0113] If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the detection image may not be clear enough, affecting the detection effect.

[0114] The magnification of the battery defect detection device 400 can be controlled by adjusting the distance L1 between the supporting component 410 and the radiation source 420, so that the initial image can be magnified while also adjusting the image quality to a certain extent. At the same time, the size of the radiation surface irradiated on the surface of the battery 411 to be tested can also be controlled. When the distance between the radiation source 420 and the supporting component 410 is small, the radiation surface of the radiation 421 on the surface of the battery 411 to be tested is also relatively small, and only part of the battery area 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 supporting component 410 increases, the radiation surface of the radiation 421 on the surface of the battery 411 to be tested is also relatively large, thereby covering a larger detection area and reducing the possibility of missed detection to a certain extent.

[0115] According to some embodiments of the present application, a second adjustment structure (not shown in the figure) is provided, wherein the second adjustment mechanism is connected to the ray source 420, and the second adjustment mechanism is configured to drive the ray source 420 to move to adjust the distance L2 between the ray source 420 and the detector 430, or the second adjustment mechanism is connected to the detector 430, and the second adjustment mechanism is configured to drive the detector 430 to move to adjust the distance L2 between the ray source 420 and the detector 430.

[0116] Based on the principle of similar triangles, the magnification of battery defect detection equipment 400 is also related to the distance L2 between the radiation source 420 and the detector 430. L2 can be the distance between the reference plane of radiation source 420 and the reference plane of detector 430. Depending on actual measurement needs, the reference plane can be a plane selected on radiation source 420 and detector 430. To facilitate the measurement of L2, the two reference planes can be parallel to each other.

[0117] If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the detection image may not be clear enough, affecting the detection effect.

[0118] By adjusting the distance between the radiation source 420 and the detector 430, different battery models can be tested. The magnification 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 is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear, affecting the detection effect. Therefore, by adjusting the distance L2 between the radiation source 420 and the detector 430, the magnification of the battery defect detection device 400 can be controlled, so that the initial image can be magnified while also adjusting the imaging quality to a certain extent.

[0119] According to some embodiments of the present application, the rated voltage V of the ray source 420 satisfies: 130 kilovolts (kV) ≤ V ≤ 150 kV, and / or the rated current I of the ray source 420 satisfies: I ≤ 500 microamperes (μA).

[0120] The energy of the radiation emitted by radiation source 420 is related to the voltage U of radiation source 420. The greater the voltage U of radiation source 420, the greater the energy of the radiation emitted by radiation source 420. The intensity of the radiation emitted by radiation source 420 is also related to the current I of radiation source 420. The greater the current I of radiation source 420, the greater the intensity of the radiation emitted by radiation source 420.

[0121] The battery defect detection equipment 400 is used to detect the interior of the battery 411 to be tested, wherein at least the morphological structure of the tab needs to be detected. Therefore, when detecting the tab, the voltage U of the ray source 420 and the current I of the ray source 420 should at least meet the requirements that the ray can penetrate the tab.

[0122] By setting the rated voltage V of the radiation source 420 to satisfy the following conditions: 130 kV ≤ V ≤ 150 kV, and / or the rated current I of the radiation source 420 to satisfy the following conditions: I ≤ 500 μA, the radiation emitted by the radiation source 420 can penetrate the battery tabs for detection without causing overexposure that would affect detection accuracy.

[0123] The second aspect of the present application provides a method for battery defect detection using the battery defect detection device 400 of any of the above embodiments. See FIG7 , which is a flowchart of the battery defect detection method provided by some embodiments of the present application. The battery defect detection device 400 performs the battery defect detection method, including:

[0124] Step S101: In response to the battery to be tested 411 being placed on the supporting component 410;

[0125] Step S102: rotating the supporting component 410 along a preset rotation axis, or rotating the radiation source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the radiation 421 emitted by the radiation source 420 is obliquely projected onto the surface of the battery to be tested 411;

[0126] Step S103 : obtaining an initial image obtained by the detector 430 by receiving the radiation penetrating the battery to be tested 411 . The initial image is used for defect detection of the battery to be tested 411 .

[0127] The supporting member 410 may be any supporting structure that can support or clamp the battery 411 under test, such as a tray, clamps, etc. The battery 411 under test may be the battery cell 20 in the above embodiment, or a battery 100 including multiple battery cells 20 .

[0128] The battery to be tested 411 is configured to be located on the supporting surface, which is the surface of the supporting component 410 that contacts the battery to be tested 411. The large surface of the battery to be tested 411 can be configured to abut the supporting surface, or the side surface of the battery to be tested 411 can be configured to abut the supporting surface.

[0129] The support member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the radiation 421 emitted by the radiation source 420. The radiation source 420 and the detector 430 as a whole can rotate along a preset rotation axis W2 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the radiation 421 emitted by the radiation source 420.

[0130] Ray 421 can pass through the battery under test 411 at an angle θ, thereby reducing obstructions between various structures in the battery under test 411, so that the cathode tab and the anode tab can be clearly captured simultaneously in the image. The obstruction can be caused by one tab blocking the other tab, or by other connectors or adapters blocking either tab.

[0131] In order to ensure the quality of image detection, the detector 430 needs to be calibrated before each detection or each time the battery defect detection device 400 is turned on.

[0132] The rotation of the carrier 410 along the preset axis, or the rotation of the radiation source 420 and the detector 430 along the preset axis can be achieved by an electric rotation mechanism or a manual rotation mechanism. That is, the rotation mechanism can be electric and controlled by an external program, or the rotation mechanism can be a purely manual rotation structure that is manually adjusted. It is understood that any mechanism that can be installed on a rotating body (a carrier or a combination of a radiation source and a detector) and can drive the rotating body to rotate can be identified as a rotation mechanism in this application.

[0133] The relative angle between the battery under test 411 and the rays emitted by the radiation source 420 can be flexibly adjusted to meet the needs of different detection scenarios. This can reduce the occlusion between the various internal structures of the battery to a certain extent, allowing all internal structures of the battery to be clearly captured simultaneously during imaging. This can also alleviate the problem of unclear imaging of some internal battery structures due to fixed imaging angles, improve the quality of the detection images, and thus enhance the accuracy of image recognition.

[0134] According to some embodiments of the present application, the surface of the battery 411 to be tested includes an end face, and the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the surface of the battery 411 to be tested so as to form at least an angle between the end face and the plane where the detector 430 is located, wherein the angle is configured to satisfy:

[0135] The projection of the cathode tab of the battery under test 411 formed on the plane where the anode tab is located based on the ray projected onto the cathode tab is staggered with the area where the anode tab is located, or the area of ​​the overlapping area between the two is smaller than a preset value.

[0136] Since the compaction density of copper is larger and the compaction density of aluminum is smaller, the grayscale value of the copper tab (anode tab) in the imaging is larger than that of the aluminum tab (cathode tab). During vertical detection, if the copper tab side is close to the radiation source, its magnification is greater, which will cause the copper tab (anode tab) to block most of the aluminum tab (cathode tab) in the imaging, resulting in unclear imaging of the cathode tab.

[0137] Therefore, during rotation, the cathode tab of the battery under test 411 is positioned closer to the radiation source than the anode tab. This causes the projection of the cathode tab of the battery under test on the plane where the anode tab is located, based on the radiation projected onto the cathode tab, to be staggered with the area where the anode tab is located, thereby reducing the obstruction of the anode tab in the imaging of the cathode tab. This improves the imaging clarity of the cathode tab to a certain extent.

[0138] By adjusting the angle between the end face of the battery 411 to be tested and the plane where the detector 430 is located, the cathode ear and the anode ear can be at least partially offset in the imaging direction, thereby reducing the occlusion of one by the other, thereby improving the imaging clarity of the two to a certain extent, and further providing image recognition accuracy to improve the sampling efficiency of the detection image.

[0139] According to some embodiments of the present application, the surface of the battery to be tested 411 includes a side surface, and the preset rotation axis is perpendicular to the side surface of the battery to be tested 411 .

[0140] The battery under test 411 is placed on the supporting surface, which is the surface of the supporting component 410 in contact with the battery under test 411. The side surface of the battery under test 411 is also the large surface of the battery under test 411.

[0141] The support member 410 can rotate along a preset rotation axis W1 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420. The ray source 420 and the detector 430 can also rotate as a whole along a preset rotation axis W2 to change the angle θ between the end face of the battery under test 411 supported on the support member 410 and the optical axis X of the ray 421 emitted by the ray source 420.

[0142] The preset rotation axis is perpendicular to the rotation plane. When the preset rotation axis is not perpendicular to the bearing surface, there is an angle between the rotation plane and the bearing surface, which may cause the bearing component 410 to block the rays 421 emitted by the ray source 420 during the rotation of the rotating mechanism.

[0143] The preset rotation axis is perpendicular to the large surface of the battery 411 under test. During rotation, the large surface of the battery remains in the same plane, improving the consistency and stability of the image after rotation, thereby enhancing the detection effect. Furthermore, by setting the rotation axis perpendicular to the support surface, the rotation process is carried out around the center of the battery 411 under test, which to a certain extent allows more rays to pass through the test surface of the battery 411 under test, thereby improving the detection effect.

[0144] According to some embodiments of the present application, the optical axis X of the ray 421 emitted by the ray source 420 is obliquely projected onto the middle area of ​​the end surface of the battery to be tested 411 .

[0145] The bearing surface includes a middle area and an edge area surrounding the middle area. When the bearing surface is a centrally symmetrical figure, the middle area of ​​the bearing surface can be the geometric center of the bearing surface, or the middle area of ​​the bearing surface can be an area that diffuses from the geometric center to the edge area.

[0146] If the ray 421 emitted by the ray source 420 strikes the center of the battery from the edge of the end face, the tab's compaction density is greater, resulting in a darker grayscale value in the image, making the tab's shape more difficult to detect. In this case, the tab is closer to the center of the battery and is obscured by structures such as the cell top cover adapter, making the image of the tab structure more blurred. Therefore, it is necessary to position the optical axis X of the ray 421 emitted by the ray source 420 as close as possible to the center of the battery end face to be tested, so that more rays 421 pass through the center of the battery end face to be tested, thereby improving the clarity of the tab structure image.

[0147] Since the projection of the center area of ​​the end face of the battery 411 to be tested on the supporting surface is located in the center area of ​​the supporting surface, when the ray 421 emitted by the ray source 420 is projected onto the middle area of ​​the supporting surface, the ray can be shot from the middle area of ​​the battery end face to the edge area of ​​the battery, thereby reducing the obstruction of the imaging of the tab by the battery cell top cover adapter to a certain extent, making the imaging of the tab morphology clearer, thereby improving the accuracy of image recognition to a certain extent.

[0148] According to some embodiments of the present application, the distance between the ray source 420 and the detector 430 and / or the distance between the supporting component 410 and the ray source 420 is adjusted in a direction perpendicular to the plane of the detector 430 .

[0149] According to the principle of similar triangles, the magnification of the detection device is related to the distance between the ray source 420 and the detector 430 and / or the distance between the carrier 410 and the ray source 420. If the magnification is too small, the magnification effect cannot be achieved well. If the magnification is too large, the initial image may not be clear enough, affecting the detection effect.

[0150] The magnification of the detection device can be controlled by adjusting the distance between the ray source 420 and the detector 430 and / or the distance between the supporting component 410 and the ray source 420, so that the initial image can be magnified while the imaging quality can be adjusted to a certain extent.

[0151] At the same time, the size of the radiation surface irradiated on the surface of the battery to be tested 411 can also be controlled. When the distance between the ray source 420 and the supporting component 410 is small, the radiation surface of the ray on the surface of the battery to be tested is also relatively small, and only part of the area of ​​the battery is irradiated with the ray, which can improve the detection effect of local details to a certain extent; when the distance between the ray source 420 and the supporting component 410 increases, the radiation surface of the ray on the surface of the battery to be tested is also relatively increased, thereby being able to cover a larger detection area and reducing the possibility of missed detection to a certain extent.

[0152] According to some embodiments of the present application, in response to a test result of a battery to be tested being unqualified, the battery to be tested is discarded or retested.

[0153] When the tab detected in the initial image of the battery has a tendency to be inserted downward, or the tab has been inserted into the electrode, the tab morphology of the battery to be tested is considered unqualified, and the battery to be tested is a risky product and needs to be rejected or re-inspected.

[0154] By outputting the test results of the battery to be tested through the initial image, automatic detection of internal defects of the battery to be tested can be achieved, thereby improving the automation level and detection efficiency of the battery testing equipment.

[0155] Referring to Figure 8, Figure 8 is a block diagram of a battery defect detection device 500 provided in some embodiments of the present application. A third aspect of the present application provides a battery defect detection device, comprising an adjustment module 501 and an acquisition module 502, wherein the adjustment module 501 is configured to adjust the angle between the end face of the battery 411 under test and the plane where the detector 430 is located in response to the battery 411 under test being placed on the supporting component 410, that is, to adjust the supporting component 410 along a preset rotation axis, or to adjust the radiation source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the radiation 421 emitted by the radiation source 420 is projected obliquely onto the surface of the battery 411 under test; the acquisition module 502 is configured to acquire an initial image obtained by the detector 430 by receiving radiation that penetrates the battery 411 under test, and the initial image is used to perform defect detection on the battery 411 under test.

[0156] According to some embodiments of the present application, the relative angle between the battery under test and the rays emitted by the radiation source can be flexibly adjusted according to the needs of different detection scenarios. This can reduce the occlusion between the various internal structures of the battery to a certain extent and enable the various internal structures of the battery to be clearly captured simultaneously during imaging. This can also improve the problem of unclear imaging of some internal battery structures due to fixed imaging angles, improve the quality of the detection image, and thus improve the accuracy of image recognition to a certain extent.

[0157] 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 battery to be tested based on the initial image.

[0158] By setting the detection module 503 to receive the initial image generated by the detector and identify the detected image to output the detection result of the battery to be tested, the internal defects of the battery to be tested can be detected, and the automation level and detection efficiency of the battery defect detection device can be improved.

[0159] An embodiment of the fourth aspect of the present application provides an electronic device, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the battery defect detection method of any one of the above embodiments.

[0160] Referring to Figure 9, Figure 9 is a block diagram of an electronic device 600 provided in some embodiments of the present application, which is an example of a hardware device that can be applied to various aspects of the present application. The electronic device is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0161] As shown in Figure 9, the device 600 includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. Various programs and data required for the operation of the device 600 can also be stored in the RAM 603. The computing unit 601, ROM 602, and 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.

[0162] Multiple components within device 600 are connected to I / O interface 605, including an input unit 606, an output unit 607, a storage unit 608, and a communication unit 609. Input unit 606 can 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 related to user settings and / or function control of the electronic device. It may include, but is not limited to, a mouse, keyboard, touch screen, trackpad, trackball, joystick, microphone, and / or remote control. Output unit 607 can be any type of device capable of presenting information, and may include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. Storage unit 608 may include, but is not limited to, a magnetic disk or an optical disk. Communication unit 609 allows device 600 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks. It may include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or chipset, such as a Bluetooth device, an 802.11 device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0163] The computing unit 601 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized 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 the various methods and processes described above. For example, in some embodiments, the battery defect detection method of any of the above-described embodiments may be implemented as a computer software program tangibly embodied in a machine-readable medium, such as the storage unit 808. In some embodiments, part or all of the computer program may be loaded and / or installed onto the device 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded into the RAM 803 and executed by the computing unit 801, one or more steps of the battery defect detection method of any of the above-described embodiments may be performed. Alternatively, in other embodiments, the computing unit 801 may be configured to perform the battery defect detection method of any of the above-described embodiments by any other suitable means (e.g., via firmware).

[0164] The machine-readable medium can be a tangible medium that can contain or store a program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0165] According to some embodiments of the present application, as shown in Figures 5-7, embodiments of the present application provide a battery defect detection device 400, comprising a radiation source 420, a detector 430, and a supporting member 410 located between the radiation source 420 and the detector 430. The supporting member 410 is used to support a battery 411 to be tested. The supporting member 410 includes a supporting surface, and the battery 411 to be tested is configured to be located on the supporting surface. The battery defect detection device 400 further comprises a rotation mechanism, as shown in Figure 4, wherein the rotation mechanism is configured to rotate the supporting member 410 along a preset rotation axis, or as shown in Figure 5, wherein the rotation mechanism is configured to 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 by the radiation source 420 is projected obliquely onto the surface of the battery 411 to be tested. The detector 430 is configured to receive the radiation 421 that penetrates the battery 411 to be tested to obtain an initial image, and the initial image is used to perform defect detection on the battery 411 to be tested.

[0166] The method for performing battery defect detection by the battery defect detection device 400 includes:

[0167] Step S101: In response to the battery to be tested 411 being placed on the supporting component 410;

[0168] Step S102: rotating the supporting component 410 along a preset rotation axis, or rotating the radiation source 420 and the detector 430 along a preset rotation axis, so that the optical axis X of the radiation 421 emitted by the radiation source 420 is obliquely projected onto the surface of the battery to be tested 411;

[0169] Step S103 : obtaining an initial image obtained by the detector 430 by receiving the radiation penetrating the battery to be tested 411 . The initial image is used for defect detection of the battery to be tested 411 .

[0170] 10 and 11 , FIG10 is a detection image of a battery under test provided in some embodiments of the present application, and FIG11 is a detection image of a battery under test provided in some embodiments of the present application.

[0171] Since the compaction density of copper is larger and the compaction density of aluminum is smaller, the grayscale value of the copper tab (anode tab) in the imaging is larger than that of the aluminum tab (cathode tab). During vertical detection, if the copper tab side is close to the radiation source, its magnification is greater, which will cause the copper tab (anode tab) to block most of the aluminum tab (cathode tab) in the imaging, resulting in unclear imaging of the cathode tab.

[0172] Therefore, during rotation, the cathode tab of the battery under test 411 is positioned closer to the radiation source than the anode tab. This causes the projection of the cathode tab of the battery under test, formed on the plane where the anode tab is located based on the radiation projected onto the cathode tab, to be staggered with the area where the anode tab is located, thereby reducing the obstruction of the cathode tab by the anode tab on the imaging of the cathode tab. As shown in FIG10 , the detection image includes a first region 4111 for imaging the anode tab and a second region 4112 for imaging the cathode tab. By adjusting the first relative angle between the battery under test 411 and the radiation emitted by the radiation source 420, the image of the cathode tab on the right side is clearer. As shown in FIG11 , the detection image includes a first region 4111 for imaging the anode tab and a second region 4112 for imaging the cathode tab. By adjusting the second relative angle between the battery under test 411 and the radiation emitted by the radiation source 420, the image of the cathode tab on the left side is also clearer, thereby improving the imaging clarity of the cathode tab to a certain extent.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

19. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the battery defect detection method according to any one of claims 10 to 15.

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