Battery detection device, method, and battery manufacturing equipment

Abstract

The present application provides a battery detection device and battery manufacturing equipment, which belong to the battery technical field. The battery detection device includes a mounting assembly, a pulsed radiation source, a detector, and a first drive assembly. The mounting assembly is used to mount a target battery and drive the target battery to move along a first direction. The pulsed radiation source is configured to irradiate a target detection area of ​​the target battery on the mounting assembly with detection radiation in a pulsed manner. The detectors are installed opposite the pulsed radiation source and are located on both sides of the mounting assembly, respectively. The detectors receive the detection radiation emitted from the pulsed radiation source and penetrating the target detection area of ​​the target battery. The first drive assembly is connected to the pulsed radiation source and the detector, respectively. The first drive assembly is used to drive the pulsed radiation source and the detector to rotate in a circumferential direction of a first rotation axis and collect a detection image of the target detection area.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is incorporated by reference into Chinese patent application No. 202321707871.8, entitled "Battery Detection Apparatus and Battery Manufacturing Equipment," filed on June 30, 2023, the entire contents of which are incorporated by reference into this application. [Technical Field]

[0002] The present application relates to the field of battery technology, and in particular to a battery detection device, method and battery manufacturing equipment. [Background technology]

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

[0004] During the manufacturing process, various internal defects occur in batteries, such as wrinkles in the electrode plates, bent heads, cracks in the electrode plates, dark marks on the electrode plates, poor electrode plate alignment, and excessive gaps between the electrode plates. These internal defects affect the quality and safety of the battery. Therefore, detecting internal defects in batteries is of great importance. Currently, internal defect detection in batteries is generally performed by manual visual inspection, which has the problem of low accuracy. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems in the background art, and therefore, one object of the present application is to provide a battery detection device, method, and battery manufacturing equipment to improve the problem of the related art that the accuracy of detecting internal defects in batteries is low.

[0006] An embodiment of a first aspect of the present application provides a battery detection device including a mounting assembly, a pulsed radiation source, a detector, and a first drive assembly, wherein the mounting assembly is used to mount a target battery and drive the target battery to move along a first direction, the pulsed radiation source is configured to irradiate a target detection area of ​​the target battery on the mounting assembly with detection radiation in a pulsed manner, the detectors are installed opposite the pulsed radiation source and are respectively located on both sides of the mounting assembly, and the detectors receive the detection radiation emitted from the pulsed radiation source and penetrating the target detection area of ​​the target battery, and the first drive assembly is connected to the pulsed radiation source and the detector, respectively, and the first drive assembly is used to drive the pulsed radiation source and the detector to rotate along a circumferential direction of a first rotation axis to collect a detection image of the target detection area.

[0007] In the technical solution of the embodiments of the present application, by installing a mounting assembly, a pulsed radiation source, and a first driving assembly, radiation detection can be performed on the detection target area of ​​the detection target battery in a pulsed scanning manner at different positions and different angles to obtain detection images that can be used for three-dimensional reconstruction, thereby improving the accuracy of image detection, and the cooperation of the pulsed radiation source, the mounting assembly, and the first driving assembly can realize online detection, which can cooperate with the battery manufacturing cycle and improve detection efficiency.

[0008] In some embodiments, the mounting assembly includes a tray and a second drive assembly, the tray is used to mount one or more target batteries, and the second drive assembly is connected to the tray, the second drive assembly includes a translation unit, and the translation unit is configured to allow the tray to translate along a first direction. By installing the second drive assembly to translate the tray, the target batteries can be moved in and out of the radiation range between the pulsed radiation source and the detector, thereby realizing automatic transmission and detection of the target batteries, adapting to the battery production rhythm and improving detection efficiency.

[0009] In some embodiments, the second drive assembly further includes a rotation unit configured to drive the tray to rotate in a circumferential direction of a second rotation axis, where the second rotation axis is a direction in which the tray surface faces the target battery and is perpendicular to the first direction. By installing the second drive assembly to drive the tray to translate, the target battery can be automatically moved into and out of the radiation range between the pulsed radiation source and the detector, thereby realizing automatic transmission and detection of the target battery, adapting to the battery production rhythm and improving detection efficiency.

[0010] In some embodiments, the target battery includes two first surfaces disposed opposite to each other and first side surfaces respectively connected to the two first surfaces, the first side surfaces being surfaces on which shorter sides of the first surfaces are located, the second rotation axis being perpendicular to the first surfaces, and the rotation unit being configured to drive the rotation of the tray so that the projection of the first side surfaces onto the tray surface forms a first angle α with the first direction, the angle α satisfying 0<α<90°. By installing the rotation unit, the position of the target battery can be adjusted and the first side surface of the target battery can be positioned at an appropriate angle within the radiation range between the pulsed radiation source and the detector, thereby adjusting the incident angle of the radiation and switching between multiple target detection areas, which is advantageous for improving the quality of the collected image of the target battery and improving the detection efficiency.

[0011] In some embodiments, the first angle α satisfies 20°≦α≦45°. By limiting the value range of the first angle within an appropriate range, the imaging quality of the detection target area can be improved, which is advantageous for improving the accuracy of subsequent image recognition and further improving the accuracy of defect detection for the detection target battery.

[0012] In some embodiments, the placement assembly includes a plurality of trays that are spaced along a first direction, and the translation unit drives the plurality of trays to translate so that the detection target areas of the detection target batteries on two adjacent trays are simultaneously located within the radiation range between the pulsed radiation source and the detector, and the detection target area is located at the corner of the detection target battery. By installing a plurality of trays and controlling the movement of the trays in combination with the second drive assembly, synchronous detection of a plurality of detection target batteries can be realized, and the battery detection efficiency can be improved.

[0013] In some embodiments, the translation unit is configured such that the minimum distance L1 between the detection target batteries on two adjacent trays along the first direction satisfies 0 < L1 ≤ 2 mm. By controlling the movement of the trays by the translation unit, the detection target batteries on adjacent trays can maintain a reasonable distance, improving the detection efficiency and reducing the waste of radiation dose at the same time.

[0014] In some embodiments, the radiation absorption rate of the tray for the detection radiation is smaller than the minimum radiation absorption rate of the detection target battery for the detection radiation. By setting the radiation absorption rate of the tray to be smaller than the minimum radiation absorption rate of the detection target battery for the detection radiation, the influence of the tray on the detection radiation can be reduced, and the accuracy of the detection result can be further improved.

[0015] In some embodiments, the material of the tray includes carbon fiber. By including carbon fiber in the material of the tray, the adverse effect on the detection result caused by the absorption of detection radiation by the tray can be reduced, the processing amount of subsequent image recognition can be reduced, and thereby the detection accuracy can be improved.

[0016] In some embodiments, the tray includes a protective layer located on the surface facing the target battery, and the surface roughness of the protective layer is less than a predetermined threshold. By providing the protective layer on the surface facing the target battery, wear of the tray against the target battery can be reduced, and damage to the target battery during the detection process can be more effectively mitigated.

[0017] In some embodiments, the mounting assembly further includes a plurality of stoppers movably connected to the tray and spaced apart, the stoppers being used to clamp the target battery. By providing a plurality of movably connected stoppers, it is possible to accommodate the clamping needs of target batteries of different sizes, and to more easily fix the target battery, thereby improving the application range of the battery detection device.

[0018] In some embodiments, the battery detection device further includes a rotating platform, the pulsed radiation source and the detector are fixedly connected to the rotating platform, and the first drive assembly drives the rotating platform to rotate along the circumferential direction of the first rotation axis. By installing the rotating platform to fix the pulsed radiation source and the detector, the positions of the pulsed radiation source and the detector can be kept stable during detection, time for readjusting the positions can be saved, and detection efficiency and detection accuracy can be improved.

[0019] In some embodiments, the maximum angle λ of rotation of the pulsed radiation source and the detector along the circumferential direction of the first rotation axis satisfies 45°≦λ≦180°. By limiting the maximum angle of rotation of the pulsed radiation source and the detector within an appropriate range, it is possible to achieve a good balance between the image quality of the detection image and the detection efficiency, and to better accommodate the manufacturing takt time of the battery.

[0020] In some embodiments, the detector is a CMOS detector, which can better cooperate with pulsed radiation sources, achieve high-speed imaging while maintaining good imaging quality, and improve the detection efficiency of target cells.

[0021] In some embodiments, the maximum size of the focal spot of the pulsed radiation source is 80 microns or less. By specifically limiting the size of the focal spot, the detection accuracy of the battery detection device can be better matched to the size of the target battery to be detected, thereby improving the detection accuracy and detection efficiency.

[0022] In some embodiments, the battery detection device further includes an image processing unit, which is connected to the detector signal and is used to recognize the detection image acquired by the detector. The image processing unit is configured to receive the image signal generated by the detector, recognize the detected image, and output the detection result of the target battery, thereby realizing automatic detection of internal defects of the target battery and improving the automation degree and detection efficiency of the battery detection device.

[0023] An embodiment of a second aspect of the present application provides a battery manufacturing device including the battery detection device of the above embodiment.

[0024] An embodiment of a third aspect of the present application provides a battery detection method using the above-mentioned battery detection device, the method including: moving a target battery to a predetermined position; collecting a plurality of detection images relating to a target detection area of ​​the target battery; recognizing the detection images; and determining a detection result of the target battery based on the recognition result.

[0025] In some embodiments, recognizing the detected image includes performing three-dimensional reconstruction on the detected image, performing preprocessing on the slice image obtained by the three-dimensional reconstruction, capturing the vertices of the cathode and the anode in the preprocessed image, and line drawings for the cathode and the anode, and determining the amount of positional deviation between the cathode and the anode and the spacing value between the cathode and the anode.

[0026] In some embodiments, determining the detection result of the battery to be detected based on the recognition result includes comparing the amount of misalignment of the cathode and anode electrodes and the spacing value of the cathode and anode electrodes with a threshold value of the amount of misalignment of the cathode and anode electrodes and a threshold value of the spacing value of the cathode and anode electrodes, respectively, and determining the detection result of the battery to be detected based on the comparison result.

[0027] The above description is merely a summary of the technical solution of the present application, which may be implemented according to the contents of the specification in order to more clearly understand the technical means of the present application. In order to make the above and other objectives, features and advantages of the present application more clearly understandable, the following particularly cites specific embodiments of the present application for description. [Brief explanation of the drawings]

[0028] In the drawings, unless otherwise specified, the same reference numerals throughout the drawings represent the same or similar parts or elements. The drawings are not necessarily drawn to scale. It should be understood that the drawings depict only some embodiments disclosed herein and should not be considered limiting on the scope of the present application. [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application; [Figure 2] 1 is a schematic exploded structural view of a battery according to some embodiments of the present application; [Figure 3] 1 is a structural schematic diagram of a battery detection device according to some embodiments of the present application; [Figure 4] 1 is a structural schematic diagram of a mounting assembly according to some embodiments of the present application, where a target battery is mounted; [Figure 5] FIG. 5 is a plan view of FIG. [Figure 6] 3A to 3C are structural schematic diagrams of battery detection devices according to some other embodiments of the present application; [Figure 7] 10A and 10B are structural schematic diagrams of battery detection devices according to still other embodiments of the present application; [Figure 8] FIG. 1 is a structural block diagram of a battery manufacturing apparatus according to some embodiments of the present application. [Figure 9]1 is a flowchart of a battery detection method according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following detailed description will be given of the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are merely for the purpose of more clearly illustrating the technical solution of the present application, and are for illustrative purposes only and should not be construed as limiting the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used herein are only for describing specific embodiments and are not intended to limit this application. The terms "comprises" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover a non-exclusive "comprise."

[0031] In the description of the embodiments of the present application, the technical terms "first," "second," etc. are merely used to distinguish between different objects, and should not be understood as indicating or suggesting the relative importance or implicitly specifying the number, specific order, or hierarchical relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0032] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various locations throughout the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, independent, or alternative embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of this application, the term "and / or" is merely a relation that describes related objects and indicates that three relations may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0034] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0035] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of the embodiments of the present application. They do not indicate or imply that the devices or elements referred to have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, the technical terms "attached," "connected," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art may understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0037] The position and condition of the electrodes within a battery have a significant impact on battery performance and safety. Taking lithium-ion batteries as an example, the spacing between the cathode and anode plates and the amount of misalignment between them are important factors affecting the safety of the wound battery core. Regarding the spacing between the cathode and anode plates: If the spacing between the cathode and anode plates is too large during the charge and discharge process, lithium ions cannot be fully absorbed into the anode channel, resulting in the accumulation of some lithium ions and lithium deposition, posing a significant safety risk. Therefore, it is necessary to ensure that the spacing between the cathode and anode plates within the battery is not too large. Regarding the misalignment of the cathode and anode plates: During the charge and discharge process, lithium ions are repeatedly absorbed and released between the cathode and anode plates. However, if there are not enough anode channels to absorb lithium ions after they are released from the cathode, lithium ions are likely to accumulate and lithium deposition can occur, posing a safety risk to the product. Therefore, it is necessary to detect the position and condition of the electrodes within the battery to timely detect internal defects and reduce the number of defective batteries.

[0038] Related technologies use X-rays to detect the electrodes inside a battery. For example, for laminated batteries, X-rays are used at a specific incident angle to detect the misalignment and gap between the cathode and anode of the laminated battery and then determine whether the battery is acceptable. However, this method has blind spots and cannot detect some defective products. Alternatively, offline CT equipment is used to rotate the battery 360° and reconstruct the image for detection. This method has drawbacks such as a relatively long time, low detection efficiency, and high detection costs, and is not compatible with battery manufacturing cycle times. Furthermore, the position of the electrodes may change during the battery rotation process, further affecting the accuracy of the battery detection results.

[0039] Based on the above considerations, in order to improve the accuracy and detection efficiency of detecting internal defects in batteries, the present application provides a battery detection device, including a mounting assembly, a pulsed radiation source, a detector, and a first drive assembly, wherein the mounting assembly is used to mount a target battery and drive the target battery to move along a first direction, the detectors are installed opposite the pulsed radiation source and are respectively located on both sides of the mounting assembly, the detectors receive detection radiation emitted from the pulsed radiation source and penetrating a detection target area of ​​the target battery, and the first drive assemblies are respectively connected to the pulsed radiation source and the detector, and the first drive assemblies are used to drive the pulsed radiation source and the detector to rotate along the circumferential direction of a first rotation axis and collect a detection image of the detection target area.

[0040] By installing the mounting assembly, the pulsed radiation source, and the first driving assembly and cooperating with each other, high-speed multi-angle imaging of the automatically transported battery can be realized, realizing three-dimensional reconstruction, improving the detection accuracy while shortening the detection time, improving the efficiency of battery detection, adapting to the battery manufacturing takt time, and realizing online detection.

[0041] The battery detection device and battery manufacturing equipment disclosed in the embodiments of the present application can be used in a battery manufacturing process, and the detected or manufactured battery cells can be used in power consuming devices such as, but not limited to, vehicles, ships, and aircraft, etc. The battery cells, batteries, etc. disclosed in the present application can be used to configure a power supply system for the power consuming device.

[0042] An embodiment of the present application provides a power-consuming device that uses a battery as a power source, and the power-consuming device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, and an electric plane toy, and the spacecraft may include an airplane, a rocket, a spacecraft, a spaceship, etc.

[0043] For convenience of explanation, the following embodiment will be described by taking an example in which the power consumption device of one embodiment of the present application is a vehicle 1000.

[0044] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for starting the vehicle 1000, navigation, and operating power consumption needs during driving.

[0045] In some embodiments of the present application, the battery 100 can not only be the operating power source for the vehicle 1000, but can also be the driving power source for the vehicle 1000, providing driving power to the vehicle 1000 in place of or in place of fuel oil or natural gas.

[0046] Referring to FIG. 2, FIG. 2 is an exploded structural schematic diagram of a battery 100 according to some embodiments of the present application. The battery 100 includes a housing 10 and battery cells 20, which are housed within the housing 10. Here, the housing 10 is used to provide a housing space for the battery cells 20, and the housing 10 may adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which are fitted over each other and which collectively define a housing space for housing the battery cells 20. The second part 12 has a hollow structure with one end open, and the first part 11 may have a plate-like structure, and the first part 11 is placed over the open side of the second part 12, thereby defining an accommodation space together with the second part 12, and both the first part 11 and the second part 12 may have a hollow structure with one end open, and the open side of the first part 11 is placed over the open side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0047] The battery 100 may include a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, parallel, or series-parallel. A series-parallel connection means that the plurality of battery cells 20 may be connected in series or in parallel. The plurality of battery cells 20 may be directly connected in series, parallel, or series-parallel, and the entire battery set may be housed within the housing 10. Of course, the battery 100 may be formed by first connecting the plurality of battery cells 20 in series, parallel, or series-parallel to form a battery module, and then connecting the plurality of battery modules in series, parallel, or series-parallel to form an integrated battery module housed within the housing 10. The battery 100 may further include other structures; for example, the battery 100 may further include bus bar members for establishing electrical connection between the plurality of battery cells 20.

[0048] Here, each battery cell 20 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 20 may be cylindrical, flat, rectangular, or have other shapes.

[0049] 3 to 5, Fig. 3 is a structural schematic diagram of a battery detection device 400 according to some embodiments of the present application. Fig. 4 is a structural schematic diagram of a mounting assembly 410 according to some embodiments of the present application, on which a detection target battery 401 is mounted, and Fig. 5 is a plan view of Fig. 4.

[0050] An embodiment of the present application provides a battery detection device 400 including a mounting assembly 410, a pulsed radiation source 420, a detector 430, and a first drive assembly 440. The battery detection device 400 is used to detect a target battery 401. The mounting assembly 410 is used to mount the target battery 401 and drive the target battery 401 to move along a first direction X, the pulsed radiation source 420 is configured to irradiate detection radiation 421 in a pulsed manner onto a detection target area 4011 of the target battery 401 on the mounting assembly 410, the detectors 430 are installed opposite the pulsed radiation source 420 and are located on both sides of the mounting assembly 410, respectively, and the detectors 430 receive detection radiation emitted from the pulsed radiation source 420 and penetrating the detection target area of ​​the target battery 401, and a first driving assembly 440 is connected to the pulsed radiation source 420 and the detector 430, respectively, and the first driving assembly 440 is used to drive the pulsed radiation source 420 and the detector 430 to rotate along a circumferential direction M of the first rotation axis 500 to collect a detection image of the detection target area.

[0051] The first rotation axis 500 is located between the driving pulse radiation source 420 and the detector 430 and is parallel to the first direction X.

[0052] The detection target battery 401 may be the battery cell 20 after encasing in the above embodiment, or a bare cell that has not yet been encased, and the detection target battery 401 may be a laminated battery formed by stacking electrode plates, or a wound battery formed by stacking and winding electrode plates. The detection target area 4011 may be any area of ​​the detection target battery 401, for example, a local area of ​​the detection target battery 401, or the entire area of ​​the detection target battery 401, and may be selected depending on the specific detection purpose.

[0053] The mounting assembly 410 is used to mount the target battery 401, specifically, to achieve the purpose of mounting the target battery 401 by supporting or clamping it. The mounting assembly 410 can move along the first direction X, thereby driving the target battery 401 to move along the first direction X, and move the target detection area of ​​the target battery 401 into and out of the detection range between the pulsed radiation source 420 and the detector 430.

[0054] The pulsed radiation source 420 is a device capable of emitting detection radiation in a pulsed manner, and is mainly composed of a radiation tube and a corresponding power source, where the detection radiation 421 may be X-rays or other radiation, and the radiation tube can emit the corresponding detection radiation 421, such as an X-ray tube or a gamma-ray tube. The pulsed radiation source 420 may be an open type (open tube) or a closed type (closed tube). In one example, the pulsed radiation source 420 is an X-ray source, and the emitted detection radiation 421 is X-rays. When the detection radiation 421 emitted from the pulse radiation source 420 passes through the target battery 401, due to differences in the materials of the cathode and anode plates in the target battery 401 (the anode surface is carbon powder, which has low radiation absorption, while the cathode surface is lithium ion material, which has high radiation absorption), the different materials have different X-ray absorption rates, and when the cathode and anode plates are wound, there is a gap between them, so the difference in the degree of X-ray absorption can be used to detect the distance between the cathode and anode plates and the amount of misalignment of the cathode and anode plates. The pulse radiation source 420 can control the emission of the detection radiation 421 based on a set pulse signal, and pulse scanning can shorten the continuous operating time of the detector 430 and extend the service life of the detector 430.

[0055] The detector 430 may be a two-dimensional flat plate detector, or an indirect flat plate detector. In some examples, the detector 430 may include a photoelectric conversion layer and a scintillator layer stacked in order on a substrate, with the scintillator layer located on the surface facing the pulsed radiation source 420, so as to receive the detection radiation 421 penetrating the target cell 401 and generate visible photons. The photoelectric conversion layer receives the visible light emitted from the scintillator layer and generates a corresponding electrical signal, which further generates a detection image of the target area.

[0056] The first drive assembly 440 is connected to the pulsed radiation source 420 and the detector 430, respectively, and drives the pulsed radiation source 420 and the detector 430 to rotate along the circumferential direction M of the first rotation axis 500. As shown in FIG. 4 , the first drive assembly 440 drives the pulsed radiation source 420 and the detector 430 to rotate around the first rotation axis 500, which is parallel to the first direction X, and the detection target region 4011 of the detection target battery 401 is also located on the first rotation axis 500. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. Along the third direction Z, the distance between the first rotation axis 500 and the pulsed radiation source 420 is h1, the distance between the first rotation axis 500 and the detector 430 is h2, and the magnification factor of the detector is (h1+h2) / h1. By adjusting the positions of the pulsed radiation source 420, the first rotation axis 500 and the detector 430 along the third direction Z, the magnification factor of the detector can be adjusted, thereby meeting the requirement of detection resolution.

[0057] In one example, even when the mounting assembly 410 mounts the target battery 401, it moves along a direction parallel to the first rotation axis 500, thereby causing the pulsed radiation source 420 and the detector 430 to rotate around the detection target area 4011 of the target battery 401. As can be understood, the pulsed radiation source 420 and the detector 430 only need to rotate relative to the target battery 401 during detection. In this embodiment, the pulsed radiation source 420 and the detector 430 are set to be capable of rotational movement, so that the target battery 401 can be kept stationary during detection, thereby preventing the position of the electrodes inside the target battery 401 from changing due to rotational movement and affecting the accuracy of the detection results. In some examples, the first drive assembly 440 is driven using a servo motor and connected to the pulsed radiation source 420 and the detector 430 via a transmission mechanism, allowing precise control of the rotational movement of the pulsed radiation source 420 and the detector 430.

[0058] The pulsed detection radiation 421 emitted from the pulsed radiation source 420 is synchronized with the rotational motion of the pulsed radiation source 420 and the detector 430. The pulse signal frequency of the detection radiation 421 and the rotation speed of the pulsed radiation source 420 and the detector 430 are controlled in a coordinated manner. After the pulsed radiation source 420 and the detector 430 rotate to a predetermined position, a pulse signal is transmitted to the radiation tube. The detection radiation 421 can be incident on the detection target area 4011 of the target battery 401 at different positions and different incident angles. After penetrating the detection target area 4011, the detection radiation 421 is received by the detector 430 and generates a corresponding electrical signal. Finally, multiple detection images of the detection target area taken at different angles are obtained, and three-dimensional reconstruction is performed, for example, using a filtered back projection algorithm. This method can effectively remove shape artifacts, has a fast speed, and relatively high reconstruction quality. During the three-dimensional reconstruction, only the region of interest, i.e., the corner slice area where the predetermined detection target area 4011 is located, can be reconstructed, thereby efficiently and quickly obtaining the target slice image.

[0059] By installing the mounting assembly 410, the pulsed radiation source 420, and the first driving assembly 440, radiation detection can be performed on the detection target area 4011 of the detection target battery 401 in a pulsed scanning manner at different positions and different angles to obtain detection images that can be used for three-dimensional reconstruction, thereby improving the accuracy of image detection. The cooperation of the pulsed radiation source 420, the mounting assembly 410, and the first driving assembly 440 can realize online detection, which can cooperate with the battery manufacturing process and improve detection efficiency.

[0060] According to some embodiments of the present application, the mounting assembly 410 includes a tray 411 and a second drive assembly 412, where the tray 411 is used to mount one or more target batteries 401, and the second drive assembly 412 is connected to the tray 411, and the second drive assembly 412 includes a translation unit 4121, which is configured to drive the tray 411 to translate along a first direction X.

[0061] The tray 411 is a disk-shaped structural member for accommodating the target battery 401. The shape of the tray 411 may be adapted to the shape of the target battery 401, for example, a rectangular flat plate. The tray 411 may hold a single target battery 401, or multiple target batteries 401 may be stacked on the tray. The second drive assembly 412 may be any drive assembly capable of driving the tray 411 and the target battery 401 to move. The translation unit 4121 may be any linear drive unit capable of driving the tray 411 and the target battery 401 thereon to move linearly along a specific direction. In some examples, the second drive assembly 412 may be a magnetic drive unit, for example, including a magnetic levitation rail and a magnetic drive base. The magnetic drive base moves along the extension direction of the magnetic levitation rail using a magnetic drive system, and the tray 411 is fixedly mounted on the magnetic drive base and can translate along the first direction X by the action of magnetic force. As can be understood, the second drive assembly 412 may be of other drive structures, such as screw drive, motor drive, etc., which are not specifically described in this embodiment.

[0062] By installing a second driving assembly 412 and driving the tray 411 in a translatory manner, the target battery 401 can be automatically moved into and out of the radiation range between the pulsed radiation source 420 and the detector 430, thereby realizing automatic transmission and detection of the target battery 401, adapting to the battery production rhythm and improving detection efficiency.

[0063] According to some embodiments of the present application, the second drive assembly 412 further includes a rotation unit 4122 configured to drive the tray 411 to rotate along a circumferential direction N of the second rotation axis 600, where the second rotation axis 600 is a direction in which the surface of the tray 411 faces the target battery 401 and is perpendicular to the first direction X.

[0064] The rotation unit 4122 may be a rotation structure directly driven by a power member, for example, a servo motor drive or a magnetic levitation drive, and may convert linear motion into rotational motion via a transmission mechanism to rotate the tray 411 along the circumferential direction N of the second rotation axis 600. The second rotation axis 600 is the direction in which the surface of the tray 411 faces the target battery 401 and is perpendicular to the first direction X; in some examples, the second rotation axis 600 passes through the center of the tray 411 and is parallel to the second direction Y, which is perpendicular to the first direction X. In some examples, the target battery 401 is placed directly above the surface of the tray 411, the second direction Y is the direction in which the second rotation axis 600 points vertically upward, and the tray 411 rotates around the vertical direction to move the target battery 401 so that it rotates around the second rotation axis 600 as an axis. In this way, when there are multiple target areas 4011, for example when the target area 4011 includes four corners of the target battery 401, each corner is rotated and moved in turn between the pulse radiation source 420 and the detector 430 for detection, and when an image is collected at the second corner, three-dimensional reconstruction processing is performed on the detected image collected at the previous corner, thereby improving detection efficiency.

[0065] By installing a rotation unit 4122 to drive the rotation of the tray 411, the rotation of the target battery 401 can be driven, thereby adjusting the portion of the target battery 401 located in the radiation range between the pulsed radiation source 420 and the detector 430, enabling detection of multiple target areas, improving detection efficiency, and more accurately collecting detection images of specific target areas 4011 on the target battery 401, thereby improving detection accuracy.

[0066] According to some embodiments of the present application, the battery to be detected 401 includes two first surfaces 4012 disposed opposite to each other and first side surfaces 4013 respectively connected to the two first surfaces 4012, the first side surfaces 4013 being the surfaces on which the tabs 4014 of the battery to be detected 401 are located, and the second direction Y is perpendicular to the first surfaces 4012. The rotation unit 4122 is configured to drive the rotation of the tray 411 so that a first angle α is formed between the projection of the first surfaces 4012 onto the surface of the tray 411 and the first direction X, and the angle α satisfies 0<α<90°.

[0067] 3 to 5, the detection target battery 401 may be a battery cell placed in a case, with the first surface 4012 being the case surface facing the large surfaces of the electrode plates of the detection target battery 401, and the first side surface 4013 being the case surface on the side where the tabs of the detection target battery 401 are located. The detection target battery 401 may be a bare cell, with the corresponding first surface 4012 being the surface on which the large surfaces of the electrode plates are located, and the first side surface 4013 being the side of the bare cell on the side where the tabs formed by extending the foil material at one end of the electrode plates that is not coated with the active material are located. In one example, the detection target battery 401 is placed on the top surface of a tray 411, the detection target area 4011 is located at a corner of the detection target battery 401, the first surface 4012 being parallel to the top surface of the tray, and the first side surface 4013 being perpendicular to the top surface of the tray 411 and parallel to the second direction Y. The rotation unit 4122 drives the tray 411 to rotate around the second rotation axis 600, so that the projection of the first side surface 4013 onto the tray forms a first angle α with the first direction X to satisfy the requirement of the radiation incident angle. If the detection target area 4011 is a plurality of different areas, the rotation unit 4122 can move the different detection target areas 4011 in turn within the radiation range to be detected.

[0068] During radiation detection of the target battery 401, detection images of the corners of the target battery 401 are mainly collected to detect and obtain parameters such as the amount of misalignment of the cathode and anode plates and the spacing between the plates, and to determine whether the quality of the target battery 401 meets quality requirements. The position of the target battery 401 can be adjusted by installing a rotation unit, so that the first side 4013 of the target battery 401 can be positioned at an appropriate angle in the detection area between the pulsed radiation source 420 and the detector 430, thereby adjusting the incident angle of the radiation and switching between multiple target areas 4011, which is advantageous for improving the quality of the collected images of the target battery 401 and improving detection efficiency.

[0069] According to some embodiments of the present application, the first angle α satisfies 20°≦α≦45°.

[0070] If the first angle α is too large or too small, the collected detection image of the target battery 401 will contain too much information about regions of no interest, which will affect the accuracy of image recognition. Specifically, by limiting the first angle α to between 20° and 45°, it is possible to collect a good detection image of the target battery 4011 of interest and improve the imaging quality. In some examples, the first angle α may be 45°.

[0071] By limiting the range of the value of the first angle within an appropriate range, the imaging quality of the detection target area can be improved, which is advantageous for improving the accuracy of subsequent image recognition, and further improves the accuracy of defect detection for the detection target battery 401.

[0072] Please refer to FIG. 6, which is a structural schematic diagram of a battery detection device according to some other embodiments of the present application.

[0073] According to some embodiments of the present application, the mounting assembly 410 includes a plurality of trays 411 spaced apart along a first direction X, and a translation unit 4121 drives the plurality of trays 411 to translate so that the detection target areas 4011 of the detection target batteries 401 on two adjacent trays 411 are simultaneously positioned within the radiation range between the pulsed radiation source 420 and the detector 430, and the detection target areas 4011 are positioned at the corners of the detection target batteries 401.

[0074] The corners of the battery 401 to be detected refer to the areas where the four corners on the first surface 4012 of the battery 401 to be detected are located. For laminated batteries and wound batteries, the corners of the battery 401 to be detected can provide good positional information on the negative and positive electrode plates, which is advantageous for determining defects between the plates, such as the amount of misalignment of the negative and positive electrode plates, and the spacing between the plates. 6 , the multiple trays 411 include adjacent first and second trays 411A and 411B, where a first target battery 401A is placed on the first tray 411A and a second target battery 401B is placed on the second tray 411B, and during detection, the second drive assembly 412 translates the first and second trays 411A and 411B to a predetermined position and rotates them by a predetermined angle, so that one corner of the first target battery 401A and one corner of the second target battery 401B are simultaneously positioned within the radiation range between the pulsed radiation source 420 and the detector 430, thereby enabling simultaneous detection of the target batteries 401 on adjacent trays. In some embodiments, multiple target batteries 401 may be stacked on any one tray 411, and thus one rotation of the pulsed radiation source 420 and the detector 430 can detect more target batteries 401. In one example, the first angle formed between the first side surface of the first target battery 401A and the first direction X is α, and the first angle formed between the first side surface of the second target battery 401B on the adjacent tray and the first direction X is β, where α=β=45°.

[0075] By installing a plurality of trays 411 and controlling the movement of the trays 411 in combination with the second drive assembly 412, synchronous detection of a plurality of battery-under-test 401 can be achieved, and the battery detection efficiency can be improved.

[0076] According to some embodiments of the present application, the translation unit 4121 is configured such that the minimum distance L1 between the battery-under-test 401 on two adjacent trays 411 along the first direction X satisfies 0 < L1 ≤ 2 mm.

[0077] The minimum distance L1 refers to the minimum distance along the first direction X between the outer contours of the projections of the battery-under-test 401 on two adjacent trays 411 onto the trays 411. As can be understood, when the tray 411 can be driven to rotate the battery-under-test 401, the minimum distance L1 refers to the minimum distance along the first direction X between the outer contours of the projections of two adjacent battery-under-test 401 onto the tray 411 during the rotation process. When the minimum distance L1 is equal to 0, there is a possibility of causing interference between two adjacent battery-under-test 401. If the minimum distance L1 is too large, it will also cause the gap between two adjacent battery-under-test 401 to be too large, resulting in some detection radiation 421 being directly received by the detector 430 without passing through the battery-under-test 401, causing waste.

[0078] By controlling the movement of the tray 411 by the translation unit 4121, the battery-under-test 401 on adjacent trays 411 can maintain a reasonable distance, improving the detection efficiency and at the same time reducing the waste of radiation dose.

[0079] According to some embodiments of the present application, the radiation absorption rate of the tray 411 with respect to the detection radiation 421 is smaller than the minimum radiation absorption rate of the battery-under-test 401 with respect to the detection radiation 421.

[0080] The detection radiation 421 is partially absorbed as it penetrates a material, causing attenuation of the radiation. Radiation absorption rate refers to the degree of radiation absorption per unit thickness of a material. Because the target battery 401 always contains multiple different materials, the degree of absorption of the detection radiation by different materials varies, and the corresponding radiation absorption rate also varies. Based on this, the detector 430 can present location information of the different materials of the target battery 401 from the received detection radiation 421. The minimum radiation absorption rate of the target battery 401 for the detection radiation 421 refers to the radiation absorption rate corresponding to the material in the target battery 421 that has the smallest absorption rate for the detection radiation 421 when the detection radiation 421 penetrates the target battery 421.

[0081] The radiation absorption rate of the tray 411 for the detection radiation 421 is mainly related to the material, and different materials have different radiation absorption rates for the detection radiation 421. Because the tray 411 is located behind the radiation of the detection target battery 401, the detection radiation 421 that penetrates the detection target battery 401 must penetrate the tray 411 in most cases, and by selecting an appropriate material, the radiation absorption rate of the tray 411 for the detection radiation 421 can be made smaller than the minimum radiation absorption rate of the detection radiation 421 of the detection target battery 401.

[0082] By setting the radiation absorption rate of the tray 411 to be smaller than the minimum radiation absorption rate for the detection radiation 421 of the detection target battery 401, the influence of the tray 411 on the detection radiation 421 can be reduced, or the tray 411 and the detection target battery 401 can be more easily distinguished from the detection image, thereby reducing the influence of the tray 411 on the detection result in the detection image and further improving the accuracy of the detection result.

[0083] According to some embodiments of the present application, the material of the tray 411 includes carbon fiber.

[0084] Carbon fiber is highly transparent to X-rays, and its X-ray absorption rate per unit thickness is only 1.4% / mm, which is much lower than the radiation absorption rate of metal materials such as aluminum. The tray 411 may be made entirely or partially of carbon fiber or a carbon fiber composite material, thereby achieving compatibility with other performance aspects.

[0085] The material of the tray 411 contains carbon fiber, which reduces the absorption of detection radiation by the tray 411, further reduces the adverse effect of the tray 411 on the detection results, reduces the amount of processing required for subsequent image recognition, and thereby improves the accuracy of detection.

[0086] According to some embodiments of the present application, the tray 411 includes a protective layer located on the surface facing the target battery 401, and the surface roughness of the protective layer is smaller than a preset threshold value.

[0087] The protective layer may be obtained by treating the surface of the tray 411 facing the battery to be detected, for example, by polishing the surface of the tray 411 facing the battery to a smooth surface so that the surface roughness at this location is less than a predetermined threshold and meets the roughness requirement. The protective layer may also be formed by adding a layer of material to the surface of the tray 411 facing the battery to be detected, such as by spraying or pasting a Teflon material layer, thereby forming a protective layer with a surface roughness less than the predetermined threshold. The predetermined threshold may be selected according to actual needs, for example, by selecting the surface roughness at the location where the protective layer is not present, i.e., the surface roughness of the protective layer is less than the surface roughness at the location where the protective layer is not present. Other appropriate thresholds may also be selected as needed to meet the protection requirements for the battery.

[0088] By providing a protective layer on the surface of tray 411 facing target battery 401, wear on tray 411 against target battery 401 can be reduced, and damage to target battery 401 during the detection process can be more effectively mitigated.

[0089] According to some embodiments of the present application, the mounting assembly 410 further includes a plurality of stoppers 413 movably connected to the tray 411 and spaced apart, the plurality of stoppers 413 being used to clamp the target battery 401.

[0090] The stoppers 413 may be movably connected to the surface of the tray 411 facing the target battery 401, for example, by providing a sliding groove and movably inserting the stoppers 413 into the sliding groove. In this manner, the target battery 401 can be clamped between the stoppers 413, thereby securing the target battery 401 and facilitating its movement or rotation. In some examples, the distance between the stoppers 413 may be adjustable to accommodate different sizes of target batteries 401. The distance between the two stoppers 413 located on opposite sides of the target battery 401 may be set larger than the size of the target battery 401, thereby preventing damage to the target battery during clamping. As can be appreciated, an elastic buffer member may be provided on the stopper 413 facing the target battery 401 to fill the gap between the stopper 413 and the target battery 401 and protect the target battery 401.

[0091] By installing multiple movably connected stoppers 413, it is possible to adapt to the clamping needs of detection target batteries 401 of different sizes, and to fix the detection target battery 401 more easily, thereby improving the applicability range of the battery detection device 400.

[0092] Please refer to FIG. 7, which is a structural schematic diagram of a battery detection device 400 according to some embodiments of the present application.

[0093] According to some embodiments of the present application, the battery detection device 400 further includes a rotating table 450, the pulsed radiation source 420 and the detector 430 are fixedly connected to the rotating table 450, and the first drive assembly 440 drives the rotating table 450 to rotate along the circumferential direction M of the first rotation axis 500.

[0094] The rotating platform 450 may be of any shape having a hollow, such as a circular ring, which allows the second drive assembly 412 to drive the tray 411 and the target battery 401 to pass through the middle. The pulsed radiation source 420 and the detector 430 are simultaneously fixedly connected to the rotating platform 450, and their relative positions are fixed; thus, the first drive assembly 440 does not need to adjust the positions of the pulsed radiation source 420 and the detector 430 when driving the rotating platform 450 to move. The first drive assembly 440 may be a servo motor or other type of power member that directly or indirectly drives the rotating platform 450 to rotate.

[0095] By installing a rotating table to fix the pulsed radiation source 420 and the detector 430, the positions of the pulsed radiation source 420 and the detector 430 can be kept stable during detection, the time required for readjusting the positions can be saved, and the detection efficiency and accuracy can be improved.

[0096] According to some embodiments of the present application, the maximum angle λ through which the pulsed radiation source 420 and the detector 430 rotate along the circumferential direction M of the first rotation axis 500 satisfies 45°≦λ≦180°.

[0097] The first drive assembly 440 can drive the pulsed radiation source 420 and the detector 430 to rotate within a certain angle range along the circumferential direction M of the first rotation axis 500, and the maximum angle λ refers to the maximum angle range within which this rotation can be achieved. The value of the maximum angle λ can be set according to detection requirements, where a smaller maximum angle λ means a smaller angular range within which the pulsed radiation source 420 and the detector 430 can rotate along the circumferential direction M of the first rotation axis 500. For some target batteries with a relatively large thickness or a relatively large number of target batteries, some target regions may exceed the detection range and cannot be detected. A larger maximum angle λ means a larger angular range within which rotation is possible, but requires a longer detection time, which is disadvantageous to improving detection efficiency. In some examples, the maximum angle λ through which the pulsed radiation source 420 and the detector 430 rotate may be 90°, for example, from −45° to 45° (the plane on which the first surface 4012 of the battery to be detected 401 is located is taken as the reference plane, and angles formed below the reference plane are negative, and angles formed above the reference plane are positive).

[0098] In this embodiment, by limiting the maximum rotation angles of the pulsed radiation source 420 and the detector 430 within an appropriate range, it is possible to achieve both image quality and detection efficiency of the detection image, and to better adapt to the manufacturing takt time of the battery.

[0099] According to some embodiments of the present application, the detector is a Complementary Metal-Oxide Semiconductor (CMOS) detector.

[0100] In this embodiment, the photodiode array of the CMOS detector is made of crystalline silicon and fabricated using a CMOS process. The CMOS detector has an amplifier near each pixel, which allows the signal to be amplified before transmission, resulting in a much higher signal level relative to noise, i.e., a higher signal-to-noise ratio and higher quantum detection efficiency for the same radiation dose. Furthermore, the CMOS detector has the advantage of having active pixels, which allows for a stronger transmitted signal and a faster reading speed.

[0101] Selecting a CMOS detector can better cooperate with a pulsed radiation source, achieve high-speed imaging while maintaining good imaging quality, and improve the detection efficiency of the target cell 401.

[0102] According to some embodiments of the present application, the maximum size of the focal spot of the pulsed radiation source 420 is less than or equal to 80 microns.

[0103] The focal spot size of a radiation source refers to the size of the focal spot along a direction parallel to the plane on which the focal spot is located. Under other conditions, the smaller the focal spot, the higher the resolution and the better the imaging quality. Common methods for measuring the focal spot size of a radiation source are divided into direct and indirect methods. The direct method refers to directly observing the focal spot shape size, such as the pinhole method. The indirect method is to calculate the focal spot size by observing the point spread function or line spread function according to the focal spot size, including the edge method, slit method, and ball target method. It may also be detected by referring to the methods specified in relevant measurement standards, such as the measurement methods listed in GB / T26834-2011.

[0104] The size of the focal spot is directly related to the image resolution of the battery detection device, and by specifically limiting the size of the focal spot diameter, the detection accuracy of the battery detection device can be better matched to the size of the target battery to be detected, thereby improving the detection accuracy and detection efficiency.

[0105] According to some embodiments of the present application, the battery detection device 400 further includes an image processing unit 460, which is connected to the detector 430 signal and is used to recognize the detection image collected by the detector 430.

[0106] The image processing unit 460 may be a computer device, and the image processing unit 460 restores an image of the object to be detected by receiving the electrical signal from the detector 430. The image processing unit 460 may have a corresponding image recognition algorithm preset, and may obtain a corresponding detection result by recognizing the detected image, and determine whether an abnormality exists in the target battery 401 based on the detection result. In one example, the image processing unit 460 may recognize the detected image to obtain parameters such as the amount of misalignment of the negative and positive plates and / or the spacing between the negative and positive plates inside the target battery 401, compare the parameters with preset thresholds, and output a corresponding detection result based on the comparison result.

[0107] The image processing unit 460 is configured to receive the image signal generated by the detector 430, recognize the detected image, and output the detection result of the target battery 401, thereby realizing automatic detection of internal defects of the target battery, and improving the automation level and detection efficiency of the battery detection device.

[0108] Referring to FIG. 8, FIG. 8 is a structural block diagram of a battery manufacturing apparatus 700 according to some embodiments of the present application.

[0109] An embodiment of the present application provides a battery manufacturing device 700 including the battery detection device 400 in the above embodiment.

[0110] The battery manufacturing equipment 700 may be equipment for manufacturing bare cells or battery cells, or may be equipment for manufacturing battery packs or assembled batteries.

[0111] The battery manufacturing equipment 700 includes a battery detection device 400, which performs non-destructive detection on the target battery 401 during the manufacturing process of the target battery 401, making it possible to detect defects inside the target battery 401 in a timely manner, thereby removing defective target batteries 401 and improving the quality of the target batteries 401.

[0112] The battery detection device of the present application will be further described below with reference to one or more specific embodiments.

[0113] 3 to 7, the battery detection device 400 includes a mounting assembly 410, a pulsed radiation source 420, a detector 430, a first driving assembly 440, a rotating table 450, and an image processing unit 460. The battery detection device 400 is used to detect a target battery 401. The mounting assembly 410 is used to mount the target battery 401 and drive the target battery 401 to move along a first direction X, the pulsed radiation source 420 is configured to irradiate detection radiation 421 in a pulsed manner onto a detection target area 4011 of the target battery 401 on the mounting assembly 410, the detectors 430 are installed opposite the pulsed radiation source 420 and are located on both sides of the mounting assembly 410, respectively, and the detectors 430 receive detection radiation emitted from the pulsed radiation source 420 and penetrating the detection target area of ​​the target battery 401, and a first driving assembly 440 is connected to the pulsed radiation source 420 and the detector 430, respectively, and the first driving assembly 440 is used to drive the pulsed radiation source 420 and the detector 430 to rotate along a circumferential direction M of the first rotation axis 500 to collect a detection image of the detection target area.

[0114] In some examples, the detection target battery 401 may be a laminated battery, and the detection target area 4011 may be a corner of the detection target battery 401.

[0115] In some examples, the mounting assembly 410 includes a tray 411, a second drive assembly 412, and a plurality of stoppers 413, the stoppers 413 being movably connected to the tray 411 and spaced apart, the tray 411 being used to mount one or more target batteries 401, and the tray 411 being made of carbon fiber or a carbon fiber composite material. The plurality of stoppers 413 are used to clamp the target batteries 401.

[0116] In some examples, the second drive assembly 412 is connected to the tray 411, and the second drive assembly 412 includes a translation unit 4121 and a rotation unit 4122, where the translation unit 4121 is configured to drive the tray 411 to translate along a first direction X, and the rotation unit 4122 is configured to drive the tray 411 to rotate along a circumferential direction N of the second rotation axis 600, so that the projection of the first side 4012 of the battery to be detected 401 onto the surface of the tray 411 forms a first angle α of 45° with the first direction X.

[0117] In some examples, the pulsed radiation source 420 and the detector 430 are fixedly connected to the rotational stage 450, and the first drive assembly 440 drives the rotational stage 450 to rotate along the circumferential direction M of the first rotational axis 500. The maximum angle λ through which the pulsed radiation source 420 and the detector 430 rotate along the circumferential direction M of the first rotational axis 500 satisfies 45°≦λ≦180°.

[0118] In some examples, the detector is a CMOS detector and the maximum size of the focal spot of the pulsed radiation source 420 is 80 microns or less.

[0119] In some examples, an image processing unit 460 is connected to the detector 430 signal and is used to recognize the resulting detector image collected by the detector 430 .

[0120] Referring to FIG. 9, FIG. 9 is a flowchart of a battery defect detection method 800 according to some embodiments of the present application.

[0121] An embodiment of the present application provides a battery defect detection method 800, which may be implemented by the battery detection device 400 in the above embodiment.

[0122] In some examples, the battery defect detection method 800 may include the following steps: Step S810: The detection target battery 401 is fixed to the mounting assembly 410. The positions of the stoppers 413 on the mounting assembly 410 are moved so that the detection target battery 401 is sandwiched between the stoppers 413.

[0123] Step S820: Move the target battery 401 to a preset position. This step includes controlling the translation unit 4121 to drive the target battery 401 to move to a specified position between the pulsed radiation source 420 and the detector 430, and controlling the rotation unit 4122 to drive the target battery 401 to rotate until the angle between the first side surface 4013 of the target battery 401 and the first direction X is 45°.

[0124] Step S830: Obtain a detection image. The pulsed radiation source 420 and the detector 430 are controlled to rotate and scan to collect multiple detection images of the detection target area 4011. The first driving assembly 440 drives the pulsed radiation source 420 and the detector 430 to rotate around the first rotation axis 500, the rotation angle is -45° to 45°, and the collection frequency and number can be specifically set according to the number and thickness of the detection target batteries 401. The pulse signal controls the radiation source to emit detection radiation, and then the detector 430 receives the detection radiation and forms a detection image.

[0125] Step S840: Recognize the detected image, specifically including:

[0126] 3D reconstruction: 3D reconstruction is performed on the detected image acquired in step S830 using the filtered back projection algorithm (FBP), which can effectively remove geometric artifacts, has a high speed, and achieves relatively high reconstruction quality. Only the region of interest, i.e., the predetermined corner slice region, is reconstructed, which can efficiently and quickly obtain the target slice image.

[0127] Image preprocessing: The slice images obtained by 3D reconstruction are preprocessed to facilitate line recognition of point capture in subsequent algorithms. The preprocessing steps include region of interest (ROI) cropping and contrast enhancement. ROI cropping crops the obtained slice images to an area without surrounding information, improving image processing efficiency and reducing the image size. Contrast enhancement enhances the grayscale contrast in the image and highlights the lines of the cathode and anode plates in the image.

[0128] Algorithm recognition: A deep learning model is used to accurately capture the vertices of the cathode and anode in the image and accurately draw the lines of the cathode and anode. First, test images of some test batteries 401 are collected, and the pre-processed images are calibrated to form a training data set. Then, the calibrated images are trained using a deep learning model, which can accurately capture and draw the vertices of the cathode and anode, and further recognize the pre-processed detected images to obtain the positional deviation amount of the cathode and anode and the distance between the cathode and anode.

[0129] Step S850: Threshold determination.

[0130] The threshold judgment involves reading the vertex coordinates of the negative and anode electrodes recognized by the algorithm, calculating the difference between their ordinates, and multiplying this by the actual size of the pixel point obtained through calibration to obtain the amount of negative and anode misalignment. At the same time, the positions of the negative and anode plates recognized by the algorithm are read and drawn, and the difference between their abscissas is calculated and multiplied by the actual size of the pixel point obtained through calibration to obtain the negative and anode spacing value. The negative and anode misalignment value and the negative and anode spacing value are then compared against the set thresholds. If the measured value of any one layer is smaller than the set threshold, it is judged as NG; otherwise, it is judged as OK. At the same time, an NG type is marked on the image. The NG type can be NG for the negative and anode plate misalignment amount, NG for the negative and anode plate spacing value, or all NG. In some examples, the threshold for determining the amount of misalignment of the cathode and anode plates is set to 0.1 mm, with products greater than 0.1 mm being OK and products smaller than 0.1 mm being NG, and the threshold for determining the spacing value of the cathode and anode plates is set to 120 microns (μm), with products greater than 120 μm being NG and products smaller than 120 μm being OK.

[0131] In some examples, step S850 may be followed by step S860: saving and uploading data.

[0132] The positional deviation of the negative and positive electrodes and the distance between the negative and positive electrodes recognized by the algorithm are automatically stored in a table and output, and the NG images and data are uploaded to a cloud system for easy viewing and tracking. The storage time of the test images and tables can be customized according to user needs.

[0133] Finally, it should be noted that the above embodiments are merely for illustrating the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications may still be made to the technical solutions described in the above embodiments, or equivalent substitutions may be made for some or all of the technical features therein. Such modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the embodiments may be combined in any manner. The present application is not limited to the specific embodiments disclosed in the description, but includes all technical solutions included within the scope of the claims. [Explanation of symbols]

[0134] 1000 vehicles, 100 battery, 200 controller, 300 motor, 10 housing, 11 first part, 12 second part, 20 battery cell, 400 Battery detection device, 401 Detection target battery, 401A First detection target battery, 401B Second detection target battery, 4011 Detection target area, 4012 First surface, 4013 First side, 410 Mounting assembly, 411 Tray, 411A First tray, 411B Second tray, 412 Second drive assembly, 4121 Translation unit, 4122 Rotation unit, 413 Stopper, 420 Pulsed radiation source, 421 Detection radiation, 430 Detector, 440 First drive assembly, 450 Rotation table, 460 Image processing unit, 500 First rotation axis, 600 Second rotation axis, 700 Battery manufacturing equipment, 800 Battery detection method.

Claims

1. A battery detection device, a mounting assembly for mounting a target battery and for driving the target battery to move along a first direction; a pulsed radiation source configured to irradiate a target area of ​​the target battery on the mounting assembly with detection radiation in a pulsed manner; a detector disposed opposite the pulsed radiation source and positioned on both sides of the mounting assembly, the detector receiving the radiation emitted from the radiation source and penetrating the detection target area of ​​the target battery; A battery detection device comprising: a first drive assembly connected to the pulsed radiation source and the detector, respectively, the first drive assembly being used to drive the pulsed radiation source and the detector to rotate along a circumferential direction of a first rotation axis to collect a detected image of the detection target area, the first rotation axis being parallel to the first direction.

2. The mounting assembly includes: a tray used to place one or more of the target batteries; 2. The battery detection device of claim 1, further comprising: a second drive assembly connected to the tray, the second drive assembly including a translation unit configured to drive the tray so that it can translate along the first direction.

3. 3. The battery detection device of claim 2, wherein the second drive assembly further includes a rotation unit configured to drive the tray to rotate along a circumferential direction of a second rotation axis, the second rotation axis being a direction in which the tray surface faces the battery to be detected and perpendicular to the first direction.

4. the target battery includes two first surfaces disposed opposite to each other and first side surfaces respectively connected to the two first surfaces, the first side surfaces being surfaces on which tabs of the target battery are located, and the second rotation axis is perpendicular to the first surfaces; 4. The battery detection device of claim 3, wherein the rotation unit is configured to drive the rotation of the tray such that a projection of the first side surface onto the tray surface forms a first angle α with the first direction, and the angle α satisfies 0<α<90°.

5. The battery detection device according to claim 4 , wherein the first angle α satisfies 20°≦α≦45°.

6. 6. The battery detection device of claim 2, wherein the mounting assembly includes a plurality of trays spaced apart along the first direction, and the translation unit drives the plurality of trays to translate so that detection target areas of batteries to be detected on two adjacent trays are simultaneously positioned within a radiation range between the pulsed radiation source and the detector, and the detection target areas are positioned at corners of the batteries to be detected.

7. The translation unit is configured to detect a minimum distance L between the target batteries on two adjacent trays along the first direction. １ is 0<L １ The battery detection device according to claim 6 , configured to satisfy a gap of ≦2 mm.

8. The battery detection device according to claim 2 , wherein an absorptivity of the tray for the detection radiation is smaller than a minimum absorptivity of the detection target battery for the detection radiation.

9. The battery detection device according to claim 8 , wherein the tray is made of a material including carbon fiber.

10. The battery detection device according to claim 2 , wherein the tray includes a protective layer located on a surface facing the battery to be detected, and the surface roughness of the protective layer is smaller than a preset threshold value.

11. 11. The battery detection device according to claim 2, wherein the mounting assembly further includes a plurality of stoppers movably connected to the tray and spaced apart, the plurality of stoppers being used to clamp the target battery.

12. The battery detection device of any one of claims 2 to 11, further comprising a rotating base, the pulsed radiation source and the detector being fixedly connected to the rotating base, and the first drive assembly driving the rotating base to rotate circumferentially around the first rotation axis.

13. 13. The battery detection device according to claim 1, wherein a maximum angle λ of rotation of the pulsed radiation source and the detector along the circumferential direction of the first rotation axis satisfies 45°≦λ≦180°.

14. 14. The battery detection device of claim 1, wherein the detector is a CMOS detector.

15. 15. The battery detection device of claim 1, wherein the maximum size of the focal spot of the pulsed radiation source is 80 microns or less.

16. the battery detection device further includes an image processing unit; 16. The battery detection device according to claim 1, wherein the image processing unit is connected to the detector signal and is used to recognize the detected image acquired by the detector.

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

18. 17. A battery detection method using a battery detection device according to any one of claims 1 to 16, the method comprising: moving a battery to be detected to a preset position; collecting a plurality of detection images relating to a detection target area of ​​the detection target battery; and recognizing the detection images; determining a detection result for the target battery based on the recognition result.

19. The step of recognizing the detected image includes: performing three-dimensional reconstruction on the detected image; Preprocessing is performed on the slice images obtained by 3D reconstruction.

20. The battery detection method of claim 18, comprising capturing the cathode vertices and anode vertices and line drawings for the cathode and anode in the preprocessed image, and determining the amount of misalignment between the cathode and anode and the spacing value between the cathode and anode.

20. Determining the detection result of the target battery based on the recognition result includes: comparing the amount of misalignment of the cathode and anode and the value of the gap between the cathode and anode with a threshold value of the amount of misalignment of the cathode and anode and a threshold value of the gap between the cathode and anode, respectively; The battery detection method according to claim 19, further comprising determining a detection result of the target battery based on a comparison result.

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