Battery testing apparatus and battery production device

Abstract

A battery testing apparatus and a battery production device, which belong to the technical field of batteries. The battery testing apparatus comprises a ray source, a detector and a carrying mechanism, wherein the carrying mechanism comprises a clamp, the clamp is used for clamping a battery to be tested, rays emitted by the ray source are projected to the detector through said battery clamped by the clamp, and the detector is used for acquiring a testing image of said battery on the basis of the received rays; and a side edge of the surface of the clamp that is used for being in contact with said battery has a chamfer.

Description

Battery testing equipment and battery production equipment

[0001] Cross-references

[0002] This application refers to Chinese patent application No. 202321706005.7, filed on June 30, 2023, entitled “Battery Detection Device and Battery Production Equipment,” 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 detection device and battery production equipment. 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] In the battery production process, batteries need to be inspected to prevent quality problems caused by defects such as cold solder joints, pinholes, cracks, and weld bursts. However, current battery testing devices cannot meet the battery testing needs.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one object of the present application is to provide a battery testing device and battery production equipment to improve the accuracy of battery testing.

[0008] An embodiment of the first aspect of the present application provides a battery testing device, comprising: a radiation source, a detector, and a supporting mechanism. The supporting mechanism includes a clamp for holding a battery to be tested. Radiation emitted by the radiation source is projected through the battery to be tested held by the clamp to the detector, which is configured to acquire a detection image of the battery to be tested based on the received radiation. The side edges of the clamp's surface that contacts the battery to be tested are chamfered.

[0009] In the technical solution of the embodiment of the present application, by setting the side edges of the surface of the clamp for clamping the battery to be tested on the supporting mechanism in contact with the battery to be tested as chamfers, the afterimage in the detection image of the battery to be tested obtained by the detector based on the received rays can be reduced, thereby improving the accuracy of battery detection.

[0010] In some embodiments, the chamfer is a circular chamfer. The circular chamfer has no sharp edges, which is more conducive to placing the battery to be tested on the supporting mechanism, thereby improving the efficiency of battery testing.

[0011] In some embodiments, the density ρ1 of the material of the fixture satisfies: 1.5 g / cm3 ≤ρ1≤1.8g / cm 3 The fixture can be made to have good radiation penetrability, and the good radiation penetrability of the fixture can reduce the impact on the imaging effect of the battery to be tested, thereby improving the accuracy of the detection.

[0012] In some embodiments, the material of the clamp includes carbon fiber board or high-density sponge. Selecting carbon fiber board or high-density sponge as the material of the clamp can improve the accuracy of detection while reducing the cost of the battery detection device.

[0013] In some embodiments, the flat-panel detector includes a scintillator layer, and the thickness H0 of the scintillator layer satisfies the following conditions: 700 μm ≤ H0 ≤ 800 μm. By adjusting the thickness of the scintillator layer of the flat-panel detector, the detection capability of the battery detection device is improved, and the thickness range of the battery under test can be met to meet the density resolution requirements. This helps to improve the accuracy of the test results for the battery under test, and can also realize the testing of batteries of different specifications, while taking into account the economic efficiency of battery testing.

[0014] In some embodiments, the scintillator layer comprises cesium iodide. Using cesium iodide as the scintillator layer material reduces photon loss in a flat-panel detector having such a structure, thereby achieving relatively high quantum detection efficiency and reducing residual image artifacts caused by the fixture on the detected image, thereby improving the detection efficiency of the flat-panel detector.

[0015] In some embodiments, the flat panel detector is an amorphous silicon flat panel detector. Using an amorphous silicon flat panel detector as the flat panel detector of the battery detection device can improve the detection efficiency and imaging effect of the battery detection device.

[0016] In some embodiments, the pixel size L2 of the flat panel detector satisfies: L2>100 μm. By limiting the pixel size L2 of the flat panel detector, the detection accuracy requirement of the battery to be tested is met, while the detection efficiency and accuracy are improved.

[0017] In some embodiments, the pixel size L2 of the flat panel detector satisfies: L2≤140 μm. By further limiting the pixel size L2 of the flat panel detector, the detection accuracy requirements of the battery to be tested can be met, and the detection efficiency and accuracy can be further improved.

[0018] In some embodiments, the focal size L1 of the radiation source satisfies the following condition: L1 ≤ 70 μm. The focal size L1 of the radiation source is directly related to the image resolution of the battery testing device. A specific focal size L1 of the radiation source can better match the detection accuracy of the battery testing device with the size of the battery being tested, thereby improving detection accuracy and efficiency.

[0019] In some embodiments, the operating voltage V0 of the radiation source satisfies the following conditions: 150 kV ≤ V0 ≤ 300 kV. By limiting the operating voltage V0 of the radiation source, it is possible to provide a satisfactory detection radiation dose while also ensuring the stability and reliability of the radiation source. Furthermore, the radiation source and detector can work together to meet the detection accuracy requirements for batteries with a wider thickness range, thereby improving detection efficiency and accuracy.

[0020] In some embodiments, the operating current I0 of the radiation source satisfies the following conditions: 800 μA ≤ I0 ≤ 1500 μA. By limiting the operating current I0 of the radiation source, it is possible to provide a satisfactory detection radiation dose while also ensuring the stability and reliability of the radiation source. Furthermore, the radiation source and detector can work together to meet the detection accuracy requirements for batteries with a wider thickness range, thereby improving detection efficiency and accuracy.

[0021] In some embodiments, the battery detection device further includes a moving mechanism and multiple detection platforms. The detection platform is provided with a radiation source and a detector. The moving mechanism is used to drive the carrying mechanism to move to multiple detection platforms in sequence, and the multiple detection platforms are configured to respectively project the optical axis of the radiation source vertically onto multiple target positions on the same surface of the battery to be tested to obtain multiple initial images, and the detection image is obtained based on the multiple initial images. The moving mechanism drives the carrying mechanism to move to multiple detection platforms in sequence, and the multiple detection platforms respectively project the optical axis of the radiation source vertically onto multiple target positions on the same surface of the battery to be tested to obtain multiple initial images, and obtain the detection image based on the multiple initial images, so that the information of the battery to be tested included in the detection image can be more comprehensive, thereby improving the accuracy of the detection.

[0022] In some embodiments, the multiple target locations include predetermined locations on opposite sides of the surface of the battery under test and a predetermined location in the center region of the battery under test. The inspection image can include most defect information of the battery under test, thereby enabling defect detection of the battery under test to be performed by obtaining initial images of the predetermined locations on opposite sides of the surface of the battery under test and the predetermined location in the center region of the battery under test, thereby improving inspection efficiency of the battery under test.

[0023] In some embodiments, the moving mechanism includes a drive member and an annular guide rail, wherein multiple testing platforms are spaced apart along the annular guide rail, and a supporting mechanism is slidably disposed on the annular guide rail. The drive member is configured to sequentially drive the supporting mechanism along the annular guide rail to positions corresponding to the multiple testing platforms. By configuring the multiple supporting mechanisms to be sequentially movable along the annular guide rail between the radiation source and the detector, the efficiency of the battery testing device in testing batteries can be improved.

[0024] In some embodiments, the carrying mechanism further includes a carrying platform, the carrying platform is used to carry the battery to be tested, wherein the density ρ2 of the material of the carrying platform satisfies: 1.5 g / cm 3 ≤ρ2≤1.8g / cm 3 Good radiation penetration can reduce the impact on the imaging effect of the battery to be tested, thereby improving the accuracy of detection.

[0025] In some embodiments, the support mechanism further includes a limit block disposed on the support platform, the limit block being used to limit the position of the battery under test placed on the support platform. By providing the limit block on the support platform to limit the position of the battery under test placed on the support platform, the battery under test can be made more stable during the testing process, thereby improving testing efficiency and accuracy.

[0026] In some embodiments, the battery testing apparatus further includes an image processing unit configured to identify defects in a test image. By identifying defects in the test image by the image processing unit, the efficiency of defect detection for the battery under test can be improved.

[0027] An embodiment of the second aspect of the present application provides a battery production device, which includes the detection device of any one of the above embodiments.

[0028] 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

[0029] 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.

[0030] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0031] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0032] FIG3 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0033] FIG4 is a schematic structural diagram of a battery detection device according to some embodiments of the present application;

[0034] FIG5 is a schematic structural diagram of a supporting mechanism according to some embodiments of the present application;

[0035] FIG6 is a schematic diagram of the structure of a flat panel detector according to some embodiments of the present application;

[0036] FIG7 is a schematic structural diagram of a battery detection device according to another embodiment of the present application;

[0037] FIG8 is a schematic structural diagram of an annular guide rail according to some embodiments of the present application;

[0038] FIG9 is a schematic structural diagram of a supporting mechanism in some other embodiments of the present application;

[0039] FIG10 is a schematic structural diagram of another battery detection device according to some embodiments of the present application;

[0040] FIG11 is a flow chart of a detection method of a detection device according to some embodiments of the present application;

[0041] FIG12 is a schematic diagram of a detection image of a battery under test according to some embodiments of the present application.

[0042] Description of reference numerals:

[0043] 1000. Vehicle;

[0044] 100, battery; 200, controller; 300, motor;

[0045] 10. Box body; 11. First part; 12. Second part;

[0046] 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Cell assembly; 23a. Tab;

[0047] 400, battery detection device; 410, radiation source; 411, radiation; 420, carrying mechanism; 421, fixture; 422, limit block; 430, detector; 431, scintillator layer; 432, photoelectric conversion layer; 440, battery to be tested; 441, surface of the fixture for contacting the battery to be tested; 450, detection platform; 460, annular guide rail; 470, image processing unit. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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).

[0054] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," 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.

[0056] 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.

[0057] Taking lithium-ion batteries as an example, their product safety issues have become a focus of attention for major users and major automobile manufacturers. Therefore, battery manufacturers need to improve battery production efficiency while exercising stricter and more comprehensive control over defects that may occur during the manufacturing process. During the charge and discharge cycle of lithium batteries, lithium ions will repeatedly intercalate and deintercalate between the cathode and cathode electrodes. However, when lithium ions are released from the cathode but there are not enough anode channels to embed them, it is easy for lithium ions to accumulate and deposit, causing certain product safety risks. If there are wrinkles on the electrode, the lithium ion deintercalation channel will be blocked, and lithium deposition problems are likely to occur, posing a safety risk. Therefore, it is necessary to detect wrinkles on the electrode inside the battery to promptly detect internal defects in the battery and reduce the outflow of defective batteries.

[0058] In related technologies, in order to detect internal defects in batteries, random destructive disassembly or less efficient computed tomography (CT) reconstruction is used. Although more defects can be identified, comprehensive inspections cannot be performed on large quantities, resulting in extremely low inspection efficiency.

[0059] Based on this, the present application proposes a battery detection device, which uses a detector and a radiation source to detect and identify defects such as electrode wrinkles, feed position folds, feed position folds, breakage and overlap of batteries of different thicknesses. It is suitable for large-scale batch testing and can effectively supervise and eliminate risky batteries.

[0060] The battery testing devices and battery production equipment disclosed in the embodiments of this application can be used in the battery manufacturing process. The tested or produced battery cells can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to form such electrical devices.

[0061] 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.

[0062] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0063] Please refer to Figure 1, 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.

[0064] 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.

[0065] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a storage space for the battery cell 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 cell 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.

[0066] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a 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.

[0067] 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.

[0068] 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.

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

[0070] 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 be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. 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, and plastic.

[0071] The battery cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more battery cell assemblies 23 may be contained in the shell 22. The battery cell assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active substances constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active substances each constitute a tab 23a. The positive and negative electrode tabs 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 positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tabs 23a connect the electrode terminals to form a current loop.

[0072] FIG4 is a schematic diagram of the structure of a battery testing device 400 according to some embodiments of the present application. As shown in FIG4 , the battery testing device 400 includes a radiation source 410, a detector 430, and a support mechanism 420. The support mechanism 420 includes a fixture 421, which is used to clamp a battery 440 to be tested. Radiation emitted by the radiation source 410 is projected onto the detector 430 through the battery 440 to be tested, which is clamped by the fixture 421. The detector 430 is used to obtain a detection image of the battery 440 to be tested based on the received radiation. The side edges of the surface 441 of the fixture 421 that contacts the battery 440 to be tested are chamfered.

[0073] In some embodiments of the present application, radiation source 410 is a device for emitting radiation 411, primarily comprising a radiation tube and a corresponding power supply. The radiation may be X-rays or other radiation, and radiation source 410 may emit corresponding radiation, such as X-rays or gamma rays. Radiation source 410 may be open (open tube) or closed (closed tube). In one example, radiation source 410 is an X-ray source, and the radiation 411 it emits is X-rays. When the ray 411 emitted by the ray source 410 passes through the battery to be tested 440, due to the difference in the materials of the anode and cathode plates in the battery to be tested 440 (the anode surface is carbon powder, which has weak absorption of rays; the cathode surface is lithium ion material, which has strong absorption of rays), and the absorption rate of the ray 411 by materials of different thicknesses is also different, and the thicker the material, the greater the absorption of the ray 411. Therefore, the flat panel detector 430 receives the ray 411 that passes through the battery to be tested 440 and obtains a detection image of the battery to be tested 440, which will show various defects of the battery to be tested 440, so that defects of the battery to be tested 440 can be detected through the detection image of the battery to be tested 440.

[0074] In some embodiments of the present application, the detector 430 may be a flat-panel detector or a linear array detector, wherein the flat-panel detector is an area array detector that can directly image the irradiated rays 411. The linear array detector is a linear image sensor that achieves high-speed, high-resolution image acquisition by aligning the pixel rows of the image sensor perpendicular to the direction of movement of the object to be detected. The detector 430 can convert the energy of the received rays 411 into a recordable electrical signal, and by measuring the amount of rays received by the detector 430, an electrical signal proportional to the amount of rays is generated, thereby forming a corresponding detection image. Exemplarily, the detector 430 may include three parts: a ray conversion module, a photoelectric conversion module, and a signal readout and transmission module. When the battery detection device 400 is detecting the battery 440 to be tested, the battery 440 to be tested is placed in the radiation area of ​​the radiation source 410. The radiation 411 emitted by the radiation source 410 is emitted from the radiation irradiation window. The emitted radiation 411 passes through the battery 440 to be tested and is projected onto the detector 430. The detector 430 receives the radiation 411 that passes through the battery 440 to be tested, and the detector 430 obtains a detection image of the battery 440 based on the received radiation 411.

[0075] In some embodiments of the present application, the carrying mechanism 420 may be any carrying structure that can fix the battery 440 to be tested in a supporting or clamping manner, such as a tray, a clamp, etc. The carrying mechanism 420 may be fixed or movable, such as a tray or a clamping mechanism that is provided with a conveying track and moves along the conveying track. The number of batteries 440 to be tested carried on the carrying mechanism 420 may be one or more. In one example, the carrying mechanism 420 may include multiple trays, each tray carrying one or more batteries 440 to be tested. The battery 440 to be tested may be the battery cell 20 in the above-mentioned embodiment, or it may be a battery 100 including multiple battery cells 20.

[0076] FIG5 is a schematic structural diagram of a support mechanism 420 according to some embodiments of the present application. As shown in FIG5 , the support mechanism 420 includes a fixture 421 for holding a battery 440 under test. When the battery testing device 400 is testing the battery 440 under test, radiation emitted by the radiation source 410 is projected onto the detector 430 through the fixture 421 and the battery 440 held therein. When the radiation 411 emitted by the radiation source 410 has a constant dose, the radiation 411 received by the detector 430 differs due to the radiation 411 being projected onto the detector 430 through the support mechanism 420, the battery 440 under test, and the fixture 421. This difference in dose can result in different responses to radiation 411 in different areas of the detector 430, which can easily cause residual images in the test image, particularly in the image of the portion of the fixture 421 that contacts the battery 440 under test. This can easily lead to misjudgments during battery defect detection. When the side of the surface 441 of the clamp 421 for contacting the battery 440 to be tested has a chamfer, the possibility of the side of the surface 441 of the clamp 421 for contacting the battery 440 to be tested forming an afterimage in the detection image can be reduced, thereby improving the accuracy of battery detection.

[0077] According to an embodiment of the present application, by setting the side of the surface 441 of the clamp 421 for clamping the battery 440 to be tested on the supporting mechanism 420 to be chamfered, the afterimage in the detection image of the battery 440 to be tested obtained by the detector 430 based on the received rays 411 can be reduced, thereby improving the accuracy of battery detection.

[0078] According to some embodiments of the present application, the chamfer is a circular chamfer.

[0079] In some embodiments of the present application, the arc chamfer has no edges, which is more conducive to placing the battery 440 to be tested on the supporting mechanism 420, thereby improving the efficiency of battery testing.

[0080] According to some embodiments of the present application, the density ρ1 of the material of the fixture 421 satisfies: 1.5 grams per cubic centimeter (g / cm 3 )≤ρ1≤1.8g / cm 3 .

[0081] According to an embodiment of the present application, the density ρ1 of the material of the clamp 421 satisfies: 1.5 g / cm 3 ≤ρ1≤1.8g / cm 3 , the material of the fixture 421 can have good radiation transmittance. The good radiation transmittance of the fixture 421 can reduce the impact on the imaging effect of the battery 440 to be tested, thereby improving the accuracy of the detection.

[0082] According to some embodiments of the present application, the material of the clamp 421 includes a carbon fiber plate or a high-density sponge.

[0083] In some embodiments of the present application, carbon fiber sheets have excellent radiation transmittance, durability, and corrosion resistance. High-density sponges also have excellent radiation transmittance, are lightweight, and have excellent flexibility. Both carbon fiber sheets and high-density sponges are relatively readily available materials.

[0084] According to an embodiment of the present application, carbon fiber board or high-density sponge is selected as the material of the clamp 421 , which can improve the accuracy of detection while reducing the cost of the battery testing device 400 .

[0085] FIG6 is a schematic structural diagram of a flat panel detector according to some embodiments of the present application. As shown in FIG6 , the flat panel detector includes a scintillator layer 431 , and a thickness H0 of the scintillator layer 431 satisfies: 700 micrometers (μm) ≤ H0 ≤ 800 μm.

[0086] In some embodiments of the present application, the flat panel detector is a two-dimensional flat panel detector, and the flat panel detector may be an indirect flat panel detector. Exemplarily, the flat panel detector may include three parts: a radiation conversion module, a photoelectric conversion module, and a signal readout and transmission module. The radiation conversion module is configured to convert received radiation 411 into optical signals, the photoelectric conversion module is configured to convert the optical signals into electrical signals, and the signal readout and transmission module is configured to form a corresponding image based on the electrical signals.

[0087] In some embodiments of the present application, the scintillator layer 431 may be a film structure stacked along the thickness direction of the flat panel detector. The scintillator layer 431 is a scintillator material layer of uniform thickness located on the surface facing the radiation source 410. It can receive the attenuated radiation 411 that has passed through the cell under test 440 and convert it into visible light.

[0088] In some embodiments of the present application, the thickness H0 of the scintillator layer 431 refers to the thickness dimension along the thickness direction of the flat panel detector 430. It can be understood that, considering factors such as manufacturing accuracy, the value of the thickness H0 of the scintillator layer 431 at different positions may be different. At this time, the thickness H0 of the scintillator layer 431 at any position can satisfy: 700μm≤H0≤800μm.

[0089] In some embodiments of the present application, increasing the thickness of the scintillator layer 431 can improve the conversion efficiency of the radiation 411. At the same dose, a flat-panel detector 430 with a thicker scintillator layer 431 can convert more photon signals, making the grayscale value differences of the battery under test 440 more obvious. When the thickness of the battery under test 440 is further increased, the thickness of the scintillator layer 431 of the flat-panel detector can be increased, thereby reducing the density resolution of the flat-panel detector, thereby meeting the density resolution requirements for detecting ultra-thick batteries under test 440.

[0090] In an embodiment of the present application, by adjusting the thickness of the scintillator layer 431 of the flat-panel detector, the detection capability of the battery detection device 400 and the thickness size range of the battery to be tested 440 that can meet the density resolution requirements are improved, which is beneficial to improving the accuracy of the detection results of the battery to be tested 440, and can realize the detection of batteries 440 to be tested of different specifications, while taking into account the economy of battery detection.

[0091] According to some embodiments of the present application, the material of the scintillator layer 431 includes cesium iodide.

[0092] In some embodiments of the present application, the flat panel detector is an indirect flat panel detector, which may include a photoelectric conversion layer 432 and a scintillator layer 431 stacked sequentially on a substrate. Scintillator layer 431 is located on the side facing the radiation source 410, thereby receiving radiation 411 that penetrates the battery under test 440 and generating visible photons. Cesium iodide is an inorganic scintillating crystal that absorbs radiation energy and emits fluorescent photons. It has the advantages of high radiation detection efficiency and high luminescence efficiency. The emitted spectral wavelength is well matched to silicon photodiodes. Due to its higher sensitivity, it uses lower radiation doses and is relatively safer.

[0093] In an embodiment of the present application, cesium iodide is used as the material of the scintillator layer 431. The flat-panel detector with this structure has less photon loss, so the quantum detection efficiency of the flat-panel detector 430 is relatively high, which can reduce the afterimage caused by the clamp 421 on the detection image, thereby improving the detection efficiency of the flat-panel detector 430.

[0094] According to some embodiments of the present application, the flat panel detector is an amorphous silicon flat panel detector.

[0095] In some embodiments of the present application, an amorphous silicon flat-panel detector (FPD) is used for indirect digital radiographic imaging. Its basic structure consists of a surface layer of scintillator material (cesium iodide or oxysulfide), a layer below that of amorphous silicon photodiode circuitry, and a bottom layer of charge readout circuitry. The scintillator on the surface of the FPD converts X-rays into visible light. The amorphous silicon photodiode array beneath the scintillator converts the visible light into an electrical signal, forming a stored charge on the photodiode's own capacitor. The amount of stored charge in each pixel is proportional to the incident X-ray intensity. Under the control of a control circuit, the stored charge of each pixel is scanned and read out. After A / D conversion, the digital signal is output and transmitted to a computer for image processing, thereby forming a digital radiographic image.

[0096] In the embodiment of the present application, the amorphous silicon flat panel detector has high conversion efficiency, wide dynamic range and strong dose tolerance. Therefore, using an amorphous silicon flat panel detector as the flat panel detector of the battery detection device 400 can improve the detection efficiency and imaging effect of the battery detection device 400.

[0097] According to some embodiments of the present application, the pixel size L2 of the flat panel detector satisfies: L2>100 μm.

[0098] In some embodiments of the present application, when the pixel size L2 of a flat panel detector is too small, the amount of light entering a single pixel decreases, the received signal becomes weaker, and the signals between pixels of the flat panel detector interfere with each other, resulting in a decrease in the signal-to-noise ratio of the detected image imaged by the flat panel detector. Therefore, the pixel size L2 of the flat panel detector cannot be too small.

[0099] In the embodiment of the present application, by limiting the pixel size L2 of the flat panel detector, the detection accuracy requirement for the battery 440 to be tested is met, while the efficiency and accuracy of the detection are improved.

[0100] According to some embodiments of the present application, the pixel size L2 of the flat panel detector satisfies: L2≤140 μm.

[0101] In some embodiments of the present application, the pixel size L2 of the flat panel detector determines the resolution of the flat panel detector. The smaller the pixel size L2 of the flat panel detector, the higher the resolution of the flat panel detector. Conversely, the larger the pixel size L2 of the flat panel detector, the lower the resolution of the flat panel detector.

[0102] In the embodiment of the present application, by further limiting the pixel size L2 of the flat panel detector, the detection accuracy requirement for the battery 440 to be tested can be met, and the efficiency and accuracy of the detection can be further improved.

[0103] According to some embodiments of the present application, the focal spot size L1 of the ray source 410 satisfies: L1 ≤ 70 μm.

[0104] In some embodiments of the present application, since the rays 411 emitted by the ray source 410 are conical, the ray source 410 has a certain focal size L1 and cannot be equivalent to a point light source. Therefore, when the battery detection device 400 is used to perform defect detection on the battery 440 to be tested, the imaging end of the battery 440 to be tested may be affected by the focal size L1 of the ray source 410. When the focal size L1 of the ray source 410 is larger, the detection image of the battery 440 to be tested becomes less clear. The size of defects in the battery 440 to be tested is generally small, and smaller defects are more sensitive to unclearness. Therefore, using a ray source 410 with a smaller focal size L1 is more conducive to defect identification.

[0105] In some embodiments of the present application, the focal size L1 of the radiation source 410 refers to the size of the focal point along a direction parallel to the plane on which the focal point lies. Under the same conditions, the smaller the focal point, the higher the resolution and the better the imaging quality. Common methods for measuring the focal size of the radiation source 410 are divided into direct and indirect methods. The direct method refers to directly observing the shape and size of the focal point, such as the pinhole method. The indirect method calculates the focal size by observing the point spread function or line spread function caused by the focal size L1, including the knife edge method, the slit method, and the ball target method. Testing can also be performed in accordance with the methods specified in relevant measurement standards, such as the measurement methods listed in GB / T26834-2011.

[0106] Exemplarily, when the focus of the ray source 410 is circular, the focus size L1 of the ray source 410 may be the diameter of the focus of the ray source 410 .

[0107] According to an embodiment of the present application, the focal size L1 of the ray source 410 is directly related to the image resolution of the battery detection device 400. The specifically defined focal size L1 of the ray source 410 can better match the detection accuracy of the battery detection device 400 with the size of the battery to be tested 440, thereby improving the detection accuracy and detection efficiency.

[0108] According to some embodiments of the present application, the operating voltage V0 of the radiation source 410 satisfies: 150 kilovolts (kv) ≤ V0 ≤ 300 kv.

[0109] In some embodiments of the present application, the maximum photon energy emitted by the X-ray source 410 is equal to the energy acquired by the incident electron in the accelerating electric field of the X-ray tube—the electron charge multiplied by the accelerating electric field. The accelerating electric field is the magnitude of the tube voltage, which is also the magnitude of the operating voltage V0 of the X-ray source 410. The higher the operating voltage V0, the higher the energy of the generated X-rays, the shorter the wavelength, and the greater the ability to penetrate matter. However, if the operating voltage V0 of the X-ray source 410 is too high, the focal spot size of the X-ray source 410 will be too large, thereby reducing the resolution of the detector 430 and hindering subsequent image recognition and defect determination.

[0110] In an embodiment of the present application, by adjusting the operating voltage V0 of the radiation source 410, it is possible to provide a detection radiation dose that meets the requirements while taking into account the stability and reliability of the radiation source 410. At the same time, the radiation source 410 and the detector can cooperate with each other to meet the requirements for detection accuracy of the battery 440 to be tested with a larger thickness range, thereby improving the efficiency and accuracy of detection.

[0111] According to some embodiments of the present application, the operating current I0 of the ray source 410 satisfies: 800 microamperes (μA) ≤ I0 ≤ 1500 μA.

[0112] In some embodiments of the present application, a higher operating current I0 of the radiation source 410 results in more high-speed electrons bombarding the target per unit time, and more radiation 411 emitted by the radiation source 410. This is equivalent to an increase in the radiation dose 411 per a given area, and thus an increase in image brightness. However, if the operating current I0 of the radiation source 410 is too high, the focal spot size of the radiation source 410 may be too large, thereby reducing the resolution of the detector 430 and hindering subsequent image recognition and defect detection.

[0113] In the embodiment of the present application, by limiting the operating current I0 of the radiation source 410, it is possible to provide a radiation dose that meets the requirements while taking into account the stability and reliability of the radiation source 410. At the same time, the radiation source 410 and the detector 430 cooperate with each other to meet the requirements for the detection accuracy of the battery 440 to be tested in a larger thickness range, thereby improving the efficiency and accuracy of the detection.

[0114] According to some embodiments of the present application, the battery testing device 400 further includes a moving mechanism and multiple testing platforms. FIG7 is a schematic structural diagram of a battery testing device according to other embodiments of the present application. As shown in FIG7 , the testing platform 450 is provided with a radiation source 410 and a detector 430. The moving mechanism is used to drive the supporting mechanism 420 to move to the multiple testing platforms 450 in sequence. The multiple testing platforms 450 are configured to respectively project the optical axis of the radiation source 410 perpendicularly onto multiple target positions on the same surface of the battery 440 to be tested to obtain multiple initial images. The test images are obtained based on the multiple initial images.

[0115] In some embodiments of the present application, the moving mechanism may be a linear guide rail or a circular guide rail, etc., any one of which can drive the carrying mechanism 420 to move sequentially to the detection platform.

[0116] In some embodiments of the present application, due to the size limitations of the detector 430, the inspection image of the battery 440 under test, obtained by the detector 430 on a single inspection platform 450 based on the received radiation 411, can only contain partial defect information of the battery 440 under test. Therefore, in order to obtain complete defect information of the battery 440 under test, the optical axis of the radiation source 410 can be projected perpendicularly onto multiple target locations on the same surface of the battery 440 under test to obtain multiple initial images, and then a detection image is obtained based on the multiple initial images. For example, for existing wrinkle detection requirements, a spatial resolution of 65 μm is required, where resolution = pixel size / magnification. However, due to the size limitations of existing manufacturing processes, a single inspection platform 450 is only compatible with batteries 440 under test with a length of less than 200 mm (referring to the longest side of the battery 440 under test). When the length of the battery 440 under test exceeds a certain size, two inspection platforms 450 are used to capture the battery 440 from both sides to obtain complete wrinkle information of the battery 440 under test.

[0117] According to an embodiment of the present application, the moving mechanism drives the supporting mechanism 420 to move to multiple detection platforms 450 in sequence. The multiple detection platforms 450 respectively project the optical axis of the ray source 410 vertically onto multiple target positions on the same surface of the battery to be tested 440 to obtain multiple initial images, and obtain a detection image based on the multiple initial images. The information of the battery to be tested 440 included in the detection image can be more comprehensive, thereby improving the accuracy of the detection.

[0118] According to some embodiments of the present application, the plurality of target positions include preset positions on two opposite sides of the surface of the battery to be tested 440 and a preset position in the center area of ​​the battery to be tested 440 .

[0119] In some embodiments of the present application, the defect information of the battery 440 to be tested is generally located at the position of the central area of ​​the battery 440 to be tested and at the positions on the opposite sides of the surface of the battery 440 to be tested. When the moving mechanism drives the carrying mechanism 420 to move to multiple detection platforms in sequence, the multiple detection platforms respectively project the optical axis of the ray source 410 perpendicularly to the preset positions on the opposite sides of the surface and the preset position of the central area of ​​the battery 440 to be tested to obtain multiple initial images, and obtain a detection image based on the multiple initial images. The detection image may include most of the defect information of the battery 440 to be tested, so that the battery 440 to be tested can be defect detected by obtaining the initial images of the preset positions on the opposite sides of the surface of the battery 440 to be tested and the preset position of the central area of ​​the battery 440 to be tested, thereby improving the detection efficiency of the battery 440 to be tested.

[0120] Figure 8 is a structural schematic diagram of a ring guide rail in some embodiments of the present application. As shown in Figure 8, the moving mechanism includes a driving member and a ring guide rail 460. Multiple detection platforms 450 are arranged at intervals along the ring guide rail 460. The supporting mechanism 420 is slidably arranged on the ring guide rail. The driving member is used to drive the supporting mechanism 420 to slide along the ring guide rail in sequence to positions corresponding to the multiple detection platforms 450.

[0121] In some embodiments of the present application, the driving member may be a motor. Multiple detection platforms 450 may be arranged at equal intervals along an annular guide rail 460. The supporting mechanism 420 may move along the annular guide rail 460, sequentially moving between the radiation source 410 and the detector 430, thereby driving the battery under test 440 to move between the radiation source 410 and the detector 430.

[0122] In some embodiments of the present application, the supporting mechanism 420 may be fixedly disposed on the annular guide rail 460 , or may be movably disposed on the annular guide rail 460 .

[0123] In the embodiment of the present application, by configuring the multiple supporting mechanisms 420 to be able to move sequentially along the annular guide rail to between the radiation source 410 and the detector 430, the efficiency of the battery testing device 400 in testing the battery 440 to be tested can be improved.

[0124] According to some embodiments of the present application, the carrying mechanism 420 further includes a carrying platform, which is used to carry the battery 440 to be tested, wherein the density ρ2 of the material of the carrying platform satisfies: 1.5 g / cm 3 ≤ρ2≤1.8g / cm 3 .

[0125] In some embodiments of the present application, the density ρ2 of the material of the supporting platform satisfies: 1.5 g / cm 3 ≤ρ2≤1.8g / cm3 The material of the supporting platform may include, for example, carbon fiber. The supporting platform may be a carbon fiber sheet formed by impregnating and curing carbon fibers arranged in the same direction with resin. The carbon fiber sheet has advantages such as low density, good radiographic transparency, light weight, good flexibility, and good durability and corrosion resistance. The good radiographic transparency can reduce the impact on the imaging effect of the battery 440 under test, thereby improving the accuracy of the test.

[0126] FIG9 is a schematic structural diagram of a carrying mechanism 420 according to some other embodiments of the present application. As shown in FIG9 , the carrying mechanism 420 further includes a limit block 422 disposed on the carrying platform, and the limit block 422 is used to limit the position of a battery to be tested 440 placed on the carrying platform.

[0127] In some embodiments of the present application, the position and size of the limit block 422 can be fixed. The position and size of the limit block 422 can also be movable, and the size of the limit block 422 can also be adjustable. When testing different models of batteries 440 to be tested, the position and size of the limit block 422 can be adjusted to adapt to various models of batteries 440 to be tested.

[0128] In the embodiment of the present application, by setting a limit block 422 on the carrying platform to limit the position of the battery 440 to be tested placed on the carrying platform, the battery 440 to be tested can be made more stable during the testing process, thereby improving the testing efficiency and accuracy.

[0129] FIG10 is a schematic structural diagram of another battery detection device according to some embodiments of the present application. As shown in FIG10 , the battery detection device 400 further includes an image processing unit 470 , which is configured to identify defects in the detection image.

[0130] In some embodiments of the present application, the image processing unit 470 can be a smart terminal such as a PC, tablet computer, mobile terminal, etc. for performing defect detection on the battery 440 to be tested, or it can be a server for performing defect detection on the battery 440 to be tested; the server can be a local server or a cloud server, and the embodiments of the present application do not impose specific restrictions on this.

[0131] The image processing unit 470 can be connected to the detector 430 by wire, or the image processing unit 470 can be connected to the detector 430 wirelessly. After the detector 430 obtains the detection image of the battery to be tested 440, the detector 430 sends the detection image of the battery to be tested 440 to the image processing unit 470, and the image processing unit 470 can perform defect detection on the battery to be tested 440 based on the detection image of the battery to be tested 440. The operation of the image processing unit 470 to perform defect detection on the battery to be tested 440 can be performed by a defect detection model or a recognition algorithm, etc., which can be selected according to actual applications and needs. For example, in order to realize defect detection of the battery to be tested 440, a pre-trained defect detection model can be stored in the image processing unit 470. After the image processing unit 470 obtains the detection image, the detection image is input into the pre-trained defect detection model, and the defect detection information of the battery to be tested 440 is obtained after being processed by the defect detection model.

[0132] In the embodiment of the present application, the image processing unit 470 identifies defects in the detection image, which can improve the efficiency of defect detection on the battery 440 to be tested.

[0133] An embodiment of the present application provides a battery production device, which includes the battery detection device 400 of any one of the above embodiments.

[0134] According to an embodiment of the present application, the battery production equipment includes a battery detection device 400, which can perform non-destructive testing on the battery to be tested 440 during the production process of the battery to be tested 440, and promptly discover defects inside the battery to be tested 440, thereby eliminating unqualified batteries to be tested 440 and improving the quality of the batteries to be tested 440.

[0135] The battery detection device 400 of the present application is further described below with reference to a specific embodiment.

[0136] The battery detection device 400 includes a radiation source 410, a detector 430, a supporting mechanism 420, and an image processing unit. The supporting mechanism 420 includes a clamp 421 and a supporting platform. The clamp 421 is used to clamp the battery 440 to be tested. The side of the surface 441 of the clamp 421 for contacting the battery 440 to be tested has a chamfer, and the chamfer is a circular chamfer. The supporting platform includes a limit block 422, which is used to limit the position of the battery 440 to be tested placed on the supporting platform. The radiation emitted by the radiation source 410 is projected onto the detector 430 through the battery 440 to be tested clamped by the clamp 421. The detector 430 is used to obtain a detection image of the battery 440 to be tested based on the received radiation 411.

[0137] The density ρ1 of the material of the fixture 421 satisfies: 1.5 g / cm 3≤ ρ1 ≤ 1.8 g / cm 3 , the material of the fixture 421 includes a carbon fiber board or high-density sponge. The detector is a flat panel detector, and the flat panel detector includes a scintillator layer. The material of the scintillator layer includes cesium iodide. The thickness H0 of the scintillator layer satisfies: 700 μm ≤ H0 ≤ 800 μm. The pixel size L2 of the flat panel detector satisfies: 100 μm < L2 ≤ 140 μm. The flat panel detector is an amorphous silicon flat panel detector. The focal spot size L1 of the radiation source satisfies: L1 ≤ 70 μm. The operating voltage V0 of the radiation source satisfies: 150 kv ≤ V0 ≤ 300 kv. The operating current I0 of the radiation source satisfies: 800 μA ≤ I0 ≤ 1500 μA. The carrier mechanism further includes a carrier platform for carrying the battery to be tested. The density ρ2 of the material of the carrier platform satisfies: 1.5 g / cm 3 ≤ ρ2 ≤ 1.8 g / cm 3 .

[0138] The battery detection device 400 further includes a driving member, an annular guide rail 460, and a plurality of detection platforms 450. The detection platforms 450 are provided with a radiation source 410 and a detector 430. The plurality of detection platforms 450 are arranged at intervals along the annular guide rail 460. The carrier mechanism 420 is slidably arranged on the annular guide rail 460. The driving member is used to drive the carrier mechanism 420 to slide sequentially along the annular guide rail 460 to positions corresponding to the plurality of detection platforms 450. The plurality of detection platforms 450 respectively project the optical axis of the radiation source 410 perpendicularly onto preset positions on opposite sides of the surface of a plurality of batteries to be tested on the same surface of the battery to be tested and preset positions in the central region of the battery to be tested 440 to obtain a plurality of initial images. The detection image is obtained based on the plurality of initial images.

[0139] FIG. 11 is a flowchart of a detection method of a detection device according to some embodiments of the present application. As shown in FIG. 11, the detection method of the battery detection device 400 includes the following steps:

[0140] Step S1101: Calibrate the flat panel detector for bright and dark fields: Calibrate the detector 430 in the battery detection device 400 to eliminate afterimages and dead pixels in the detector 430 to ensure that the detected images of the battery to be tested 440 obtained are true and effective.

[0141] Step S1102: Calibrate the measurement system: Calibrate the radiation source 410, the detector 430, the carrier mechanism 420, and the image processing unit 470 in the battery detection device 400 together to ensure that the magnification of the detected images of the battery to be tested 440 obtained remains unchanged.

[0142] Step S1103: Automatically load the battery by the manipulator: Place the battery to be tested 440 on the carrier mechanism 420.

[0143] Step S1104: Radiation source 410 automatically detects and saves an image: Radiation emitted by radiation source 410 is projected onto detector 430 through battery under test 440 held by fixture 421. Detector 430 is configured to acquire a detection image of battery under test 440 based on the received radiation 411. FIG12 is a schematic diagram of a detection image of battery under test 440 according to some embodiments of the present application. As shown in FIG12 , region P in the figure includes defect information of battery under test 440.

[0144] Step S1105: Algorithm judgment: The image processing unit 470 performs defect detection on the battery to be tested 440 based on the detection image, and obtains defect information of the battery to be tested 440 output by the defect detection model.

[0145] Step S1106: OK products are pulled in, and NG products are discharged: in response to the test result of the battery 440 indicating that the battery 440 is defective, the defective battery is removed and the non-defective battery is subjected to the next step of testing.

[0146] 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. Battery testing device, including: Radiation source; detector; The carrying mechanism includes a clamp, the clamp is used to clamp the battery to be tested, the radiation emitted by the radiation source is projected to the detector through the battery to be tested clamped by the clamp, and the detector is used to obtain a detection image of the battery to be tested based on the received radiation; The side edge of the surface of the fixture for contacting the battery to be tested has a chamfer.

2. The battery testing device according to claim 1, wherein: The chamfer is a circular chamfer.

3. The battery testing device according to claim 1 or 2, wherein: The density ρ1 of the material of the fixture satisfies: 1.5 g / cm 3 ≤ρ1≤1.8g / cm 3 .

4. The battery testing device according to claim 3, wherein: The material of the clamp includes carbon fiber plate or high-density sponge.

5. The battery testing device according to any one of claims 1 to 4, wherein: The detector is a flat panel detector, wherein the flat panel detector comprises a scintillator layer, and a thickness H0 of the scintillator layer satisfies: 700 μm≤H0≤800 μm.

6. The battery testing device according to claim 5, wherein: The material of the scintillator layer includes cesium iodide.

7. The battery testing device according to claim 5 or 6, wherein: The flat panel detector is an amorphous silicon flat panel detector.

8. The battery testing device according to any one of claims 5 to 7, wherein: The pixel size L2 of the flat panel detector satisfies: L2>100 μm.

9. The battery testing device according to claim 8, wherein: The pixel size L2 of the flat panel detector satisfies: L2≤140 μm.

10. The battery testing device according to any one of claims 1 to 9, wherein: The focal point size L1 of the ray source satisfies: L1≤70 μm.

11. The battery testing device according to any one of claims 1 to 10, wherein: The operating voltage V0 of the ray source satisfies: 150kv≤V0≤300kv.

12. The battery testing device according to any one of claims 1 to 11, wherein: The operating current I0 of the ray source satisfies: 800μA≤I0≤1500μA.

13. The battery testing device according to any one of claims 1 to 12, wherein: The battery detection device also includes a moving mechanism and a plurality of detection platforms, wherein the detection platform is provided with the ray source and the detector. The moving mechanism is used to drive the supporting mechanism to move to the multiple detection platforms in sequence, and the multiple detection platforms are configured to respectively project the optical axis of the radiation source vertically onto multiple target positions on the same surface of the battery to be tested to obtain multiple initial images, and the detection images are obtained based on the multiple initial images.

14. The battery testing device according to claim 13, wherein: The plurality of target positions include preset positions on two opposite sides of the surface of the battery to be tested and a preset position in a central area of ​​the battery to be tested.

15. The battery testing device according to claim 13, wherein: The moving mechanism includes a driving member and an annular guide rail, the multiple detection platforms are arranged at intervals along the annular guide rail, the supporting mechanism is slidably arranged on the annular guide rail, and the driving member is used to drive the supporting mechanism to slide along the annular guide rail in sequence to positions corresponding to the multiple detection platforms.

16. The battery testing device according to any one of claims 1 to 15, wherein: The carrying mechanism further includes a carrying platform, which is used to carry the battery to be tested, wherein the density ρ2 of the material of the carrying platform satisfies: 1.5 g / cm 3 ≤ρ2≤1.8g / cm 3 .

17. The battery testing device according to claim 16, wherein: The carrying mechanism further comprises a limit block arranged on the carrying platform, and the limit block is used to limit the position of the battery to be tested placed on the carrying platform.

18. The battery testing device according to any one of claims 1 to 17, wherein: The battery detection device also includes an image processing unit; The image processing unit is configured to identify defects in the inspection image.

19. A battery production device, comprising the battery detection device according to any one of claims 1 to 18.

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