Detection equipment of battery device

Abstract

The invention discloses detection equipment for a battery device, and relates to the technical field of battery manufacturing. The detection equipment for the battery device comprises a detection device and a ray device, the detection device is used for bearing a to-be-detected battery cell, and the detection device is further used for receiving rays penetrating through at least two corner areas of the to-be-detected battery cell; the ray device is used for being arranged on the side, back on to the detection device, of the to-be-detected battery cell and is spaced from the to-be-detected battery cell, and rays emitted by the ray device are used for covering at least two corner areas of the to-be-detected battery cell. When the detection equipment of the battery device is used, the to-be-detected battery cell can be borne through the detection device, and the ray device is arranged on one side, back to the detection device, of the to-be-detected battery cell and is spaced from the to-be-detected battery cell, so that the detection device is closer to a cathode piece and an anode piece of the to-be-detected battery cell; therefore, the degree of boundary blurring caused by the focus size of the ray device is reduced, and the imaging definition of the cathode and anode pieces with a large number of layers and small thicknesses can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a detection device for a battery device. Background Art

[0002] With the rapid development of new energy technologies, major automobile OEMs and users are paying more attention to battery safety; while improving the efficiency of battery cell production, battery cell manufacturers are also carrying out stricter control and comprehensive testing of battery cells that may have defects during the manufacturing process.

[0003] The cell of lithium battery is formed by winding process, lamination process, etc. The cell includes multiple layers of cathode and anode sheets, and the cathode and anode sheets are relatively thin. The related technology uses X-ray detection equipment to detect the misalignment of cathode and anode sheets, the gap between cathode and anode sheets, and the wrinkles on the large surface of the sheets. Among them, the related technology usually adopts the method of magnifying the image to a larger magnification to improve the imaging clarity of cathode and anode sheets with more layers and thinner thickness, but the imaging clarity still has room for improvement. Summary of the invention

[0004] The main purpose of this application is to propose a battery device detection device, aiming to improve imaging clarity.

[0005] To achieve the above-mentioned purpose, the detection equipment of the battery device proposed in the present application includes a detection device and a radiation device, the detection device is used to carry the battery cell to be tested, and the detection device is also used to receive radiation passing through at least two corner areas of the battery cell to be tested; the radiation device is used to be arranged on the side of the battery cell to be tested that is away from the detection device and is spaced apart from the battery cell to be tested, and the radiation emitted by the radiation device is used to cover at least two corner areas of the battery cell to be tested.

[0006] When in use, the battery device detection equipment provided by the present application can carry the battery cell to be tested through the detection device, and the radiation device is arranged on the side of the battery cell to be tested that is away from the detection device and is spaced from the battery cell to be tested, so that the detection device is closer to the anode and cathode plates of the battery cell to be tested, thereby reducing the degree of boundary blur caused by the focal size of the radiation device, and facilitating the improvement of imaging clarity for anode and cathode plates with more layers and thinner thickness; in addition, when the detection device carries the battery cell to be tested, the imaging magnification of the detection device is small, and the imaging coverage range of the detection device is large. The radiation emitted by the radiation device covers at least two corner areas of the battery cell to be tested, which is conducive to reducing the number of focal points required for the radiation device, reducing the corresponding radiation generating device and protective device, reducing equipment costs, and saving the use area of ​​the factory building for the battery device detection equipment.

[0007] Optionally, the detection device includes at least two corner detectors disposed at intervals, the corner detectors are used to carry the corner area, and the rays emitted by the ray device are used to at least cover the corner area carried by the corner detectors.

[0008] At this time, the detection equipment of the battery device carries the corner area of ​​the battery cell to be tested through the corner detector, thereby improving the imaging clarity of the anode and cathode misalignment and the gap between the anode and cathode of the battery cell to be tested; in addition, the detection equipment of the battery device reduces the total detection area of ​​the detector by setting the corner detectors at intervals, thereby further reducing the equipment cost.

[0009] Optionally, the battery cell to be tested has a first side surface facing away from the radiation device and a second side surface arranged next to the first side surface, and the area of ​​the first side surface is larger than the area of ​​the second side surface; the detection device includes four corner detectors arranged at intervals, and the four corner detectors are respectively used to support the four corners of the first side surface.

[0010] At this time, the detection equipment of the battery device carries the four corners of the first side respectively through four corner detectors, thereby further improving the imaging clarity of the misalignment of the anode and cathode plates of the battery cell to be tested and the gap between the anode and cathode plates; in addition, the detection equipment of the battery device further reduces the equipment cost by arranging the four corner detectors at intervals.

[0011] Optionally, the detection device also includes a center detector, which is arranged on the side of the corner detector facing away from the radiation device; the corner detector is carried on the center detector, and the area of ​​the corner detector is smaller than the area of ​​the center detector; and when projecting along the central axis of the ray emitted by the radiation device, the projection of the battery cell to be tested is located within the projection of the center detector.

[0012] At this time, the detection equipment of the battery device makes the projection of the battery cell to be tested located within the projection of the central detector, so that the surface wrinkles of the battery cell to be tested can be detected through the central detector; in addition, when the corner detector carries the corner area of ​​the battery cell to be tested, the corner detector is carried on the central detector, so that the central detector is closer to the battery cell to be tested, thereby reducing the degree of boundary blur caused by the focal size at the central detector, which is beneficial to improving imaging clarity.

[0013] Optionally, the radiation device includes a corner radiation source and a center radiation source, and the corner radiation source and the center radiation source are respectively used to be arranged on a side of the battery cell to be tested facing away from the detection device and are respectively spaced apart from the battery cell to be tested; the radiation emitted by the center radiation source is used to cover at least a center area of ​​the battery cell to be tested, and the radiation emitted by the corner radiation source is used to cover at least one corner area of ​​the battery cell to be tested.

[0014] At this time, since the intensity of the rays usually decreases as the radiation angle of the rays increases, the detection equipment of the battery device increases the radiation dose in the corner areas of the battery cell to be tested by making the rays emitted by the central ray source cover at least the central area of ​​the battery cell to be tested, and the rays emitted by the corner ray source cover at least one corner area of ​​the battery cell to be tested, thereby improving the image signal-to-noise ratio of the corner areas, which is beneficial to improving the imaging clarity of the corner areas of the battery cell to be tested.

[0015] Optionally, along a direction perpendicular to a bearing surface of the detection device, a distance from the corner ray source to the detection device is smaller than a distance from the central ray source to the detection device.

[0016] At this time, the distance from the corner radiation source to the detection device is smaller than the distance from the center radiation source to the detection device, and the corner detector is relatively closer to the corner area of ​​the battery cell to be tested, which is beneficial to further increase the radiation dose in the corner area of ​​the battery cell to be tested, thereby improving the image signal-to-noise ratio of the corner area, which is beneficial to improve the imaging clarity of the corner area of ​​the battery cell to be tested.

[0017] Optionally, the ray device includes two corner ray sources, and the first corner ray source, the center ray source and the second corner ray source are arranged in a direction parallel to the battery cell to be tested; the rays emitted by the first corner ray source are used to cover two adjacent corner areas of the battery cell to be tested, and the rays emitted by the second corner ray source are used to cover the other two adjacent corner areas of the battery cell to be tested.

[0018] At this time, the rays emitted by the first corner ray source are used to cover two adjacent corner areas of the battery cell to be tested, and the rays emitted by the second corner ray source are used to cover the other two adjacent corner areas of the battery cell to be tested, thereby improving the detection efficiency of each corner area of ​​the battery cell to be tested while improving the imaging clarity of the corner area of ​​the battery cell to be tested.

[0019] Optionally, the distance from the central axis of the ray emitted by the central ray source to the center of the central detector is smaller than the distance from the central axis of the ray emitted by the corner ray source to the center of the central detector; and / or, on the plane where the central detector is located, the distance from the side edge of the ray emitted by the central ray source to the center of the corner detector is smaller than the distance from the center of the corner detector to the center of the central detector.

[0020] At this time, the distance from the central axis of the ray emitted by the central ray source to the center of the central detector is smaller than the distance from the central axis of the ray emitted by the corner ray source to the center of the central detector, which is beneficial to increase the ray dose of the corner area of ​​the battery cell to be tested through the corner ray source, thereby improving the image signal-to-noise ratio of the corner area, thereby helping to improve the imaging clarity of the corner area of ​​the battery cell to be tested. The distance from the side edge of the ray emitted by the central ray source to the center of the corner detector is smaller than the distance from the center of the corner detector to the center of the central detector, which is beneficial to reduce the radiation angle of the central ray source and reduce the ray energy consumption, and is beneficial to increase the ray dose of the corner area of ​​the battery cell to be tested through the corner ray source, thereby improving the image signal-to-noise ratio of the corner area, thereby helping to improve the imaging clarity of the corner area of ​​the battery cell to be tested.

[0021] Optionally, the detection equipment of the battery device also includes a partition, which is arranged on the side of the central detector facing the radiation device; projection is performed along the central axis of the rays emitted by the central ray source, and the projection of the rays emitted by the central ray source and the projection of the rays emitted by the corner ray source overlap with the projection of the partition respectively.

[0022] At this time, the projection of the rays emitted by the central ray source and the projection of the rays emitted by the corner ray source overlap with the projection of the partition, which is beneficial to detect the surface wrinkles of the battery cell to be tested through the central detector, and is beneficial to reducing the radiation dose irradiating the central detector through the partition, thereby reducing the risk of damage to the central detector.

[0023] Optionally, the detection equipment of the battery device also includes a partition, which is arranged on the side of the central detector facing the radiation device; for two adjacent corner areas of the battery cell to be tested that are covered by the rays emitted by the corner ray source, the partition is arranged between the two corner areas.

[0024] At this time, the partition is set between two adjacent corner areas. The partition can reduce the radiation dose irradiated to the central detector near the edge position of the battery cell to be tested, thereby reducing the risk of damage to the central detector; in addition, the partition can also reduce the detection interference to the central area of ​​the battery cell to be tested by being set near the edge position of the battery cell to be tested.

[0025] Optionally, the detection device also includes a center detector, and the area of ​​the corner detector is smaller than that of the center detector; the center detector is arranged beside all the corner detectors, and the center detector is used to carry the battery cell to be tested; the projection is performed along the central axis of the ray emitted by the ray device, and the projection of the battery cell to be tested is located within the outer boundary of the projection of the center detector.

[0026] At this time, the detection equipment of the battery device sets the central detector next to all the corner detectors, thereby reducing the risk of overlapping between the rays obtained by the central detector and the rays obtained by the corner detectors, reducing the radiation dose irradiating the central detector, and reducing the risk of damage to the central detector.

[0027] Optionally, the pixel size of at least part of the detection device is set to be less than 30 microns.

[0028] At this time, when the detection device is closer to the anode and cathode of the battery cell to be tested and the degree of boundary blur caused by the focal size of the radiation device is reduced, the pixel size of the detection device is set to be less than 30 microns, which is beneficial to improving the image resolution at a small magnification, thereby helping to improve the imaging clarity.

[0029] Optionally, the pixel size of at least part of the detection device is set to be less than or equal to 20 microns.

[0030] At this time, the pixel size of at least part of the detection device is set to be less than or equal to 20 microns, which is beneficial to further improve the image resolution under a small magnification, thereby helping to further improve the imaging clarity.

[0031] Optionally, a size of at least one focus of the radiation device is greater than or equal to 0.8 mm.

[0032] At this time, when the image resolution is improved by setting the pixel size of the detection device to less than 30 microns, the size of at least one focus of the radiation device is greater than or equal to 0.8 mm, which can improve the radiation energy and penetration of the radiation device, and help to make up for the insufficient radiation absorption capacity of the radiation device with a smaller pixel size, thereby improving the image signal-to-noise ratio of the detection device, which is beneficial to improve the imaging clarity of the battery cell to be tested.

[0033] Optionally, a size of at least one focus of the radiation device is greater than or equal to 1 mm.

[0034] At this time, when the image resolution is improved by setting the pixel size of the detection device to less than 30 microns, the size of at least one focus of the radiation device is greater than or equal to 1 mm, which can further improve the radiation energy and penetration of the radiation device, and help to make up for the insufficient radiation absorption capacity of the radiation device with a smaller pixel size, thereby further improving the image signal-to-noise ratio of the detection device, which is beneficial to further improve the imaging clarity of the battery cell to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0036] Figure 1 It is a structural schematic diagram of an embodiment of a ray detection device in the related art; Figure 2 It is a schematic diagram of the use of an embodiment of a ray detection device in the related art; Figure 3 A schematic diagram of the structure of an embodiment of a battery device detection device provided in the present application; Figure 4 A forward schematic diagram of an embodiment of a detection device for a battery device provided by the present application; Figure 5 A schematic diagram of the use of an embodiment of a battery device detection device provided by the present application; Figure 6 An imaging effect diagram of an embodiment of a detection device for a battery device provided in the present application; Figure 7 A schematic structural diagram of another embodiment of a battery device detection device provided in the present application; Figure 8 A forward schematic diagram of another embodiment of a battery device detection device provided by the present application; Fig. 9 A schematic structural diagram of another embodiment of a battery device detection device provided in the present application; Fig.10 A schematic diagram of another embodiment of the battery device detection device provided in the present application.

[0037] Description of Figure Numbers: 100. Testing equipment for battery devices; 110. detection device; 111. corner detector; 112. center detector; 120, ray device; 121, corner ray source; 122, center ray source; 130, partition; 200, battery cell to be tested; 201, corner area; 202, center area; 210, first side surface; 220, second side surface.

[0038] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] With the rapid development of new energy technologies, major automobile OEMs and users are paying more attention to battery safety; while improving the efficiency of battery cell production, battery cell manufacturers are also carrying out stricter control and comprehensive testing of battery cells that may have defects during the manufacturing process.

[0043] The cell of lithium battery is formed by winding process, lamination process, etc. The cell includes multiple layers of cathode and anode sheets, and the cathode and anode sheets are relatively thin. The related technology uses X-ray detection equipment to detect the misalignment of cathode and anode sheets, the gap between cathode and anode sheets, and the wrinkles on the large surface of the sheets. Among them, the related technology usually adopts the method of magnifying the image to a larger magnification to improve the imaging clarity of cathode and anode sheets with more layers and thinner thickness, but the imaging clarity still has room for improvement.

[0044] in, Figure 1 The structural diagram of an embodiment of a radiation detection device in the related art is shown. Figure 1 In the related art, the ray detection equipment includes a detection device 110a and a ray device 120a, so as to detect the battery cell 200a to be tested. The battery cell 200a to be tested has a first side surface 210a facing away from the ray device 120a and a second side surface 220a arranged next to the first side surface 210a, and the area of ​​the first side surface 210a is larger than the area of ​​the second side surface 220a, wherein the first side surface 210a can be understood as the large surface of the electrode. In addition, the battery cell 200a to be tested usually has a pole ear, which is usually arranged on the second side surface 220a with a relatively small area. The battery cell 200a to be tested is usually formed by a winding process, a lamination process, etc. The specific types of the battery cell 200a to be tested include square shell batteries, cylindrical batteries, soft-pack batteries and blade batteries, etc., wherein square shell batteries, soft-pack batteries and blade batteries usually have four corner areas 201a. In the related art, the radiation detection equipment detects the misalignment of the cathode and anode pieces, the gap between the cathode and anode pieces, etc. by irradiating the corner area 201a with the radiation device 120a.

[0045] Reference Figure 1 , when performing detection, the magnification of the radiation detection device is equal to (F10+F20) / F10. In addition, the related art usually carries the battery cell 200a to be tested through an external carrying component, and makes the radiation device 120a closer to the battery cell to be tested and the detection device 110a farther from the battery cell to be tested 200a, so as to obtain a larger magnification, thereby improving the imaging clarity.

[0046] However, refer to Figure 2 Since the focus of the radiation device 120a usually has a certain focus size D0, when the radiation device 120a detects the entire or a part of the battery cell 200a to be tested, the edge of the image on the detection device 110a is usually not sharp enough, for example, Figure 2 The edge blur area W0 in the reference Figure 1 and Figure 2It can be seen that when pursuing a larger magnification (F10+F20) / F10, the detection device 110a is relatively far away from the battery cell 200a to be tested, and the edge fuzzy area W0 is wider; in addition, since the anode and cathode sheets in the battery cell 200a to be tested usually have more layers and thinner thicknesses, the fuzzy area W0 interferes more with the electrode image, and the edge fuzzy area W0 has a greater adverse effect on the imaging clarity of the anode and cathode sheets.

[0047] In addition, refer to Figure 1 and Figure 2 , the related technology uses a larger magnification to observe the corresponding corner area 201a, which results in a smaller imaging range of the detection device 110a, for example Figure 1 Four detection devices 110a are usually required to be correspondingly arranged in the four corner areas 201a.

[0048] Therefore, based on the above considerations, in order to improve the imaging clarity, the present application proposes a battery device detection device. When used, the battery device detection device can reduce the degree of boundary blur caused by the focal size of the radiation device, so as to improve the imaging clarity of the cathode and anode sheets with more layers and thinner thickness.

[0049] Next, the structure of the battery device detection device proposed in the present application is explained with a specific implementation method.

[0050] Reference Figure 3 and Figure 4 In one embodiment of the present application, the battery device detection device 100 is used for the battery cell 200 to be tested; it can be understood that the battery cell 200 to be tested is used to form a battery cell, and the battery cell can form a battery device together with a box structure, etc. It can be understood that the battery device detection device provided in the present application can be used to detect a complete battery device, or to detect a battery cell or battery cell used to form a battery device.

[0051] The battery cell 200 to be tested has a first side surface 210 facing away from the radiation device 120 and a second side surface 220 arranged beside the first side surface 210, the area of ​​the first side surface 210 is larger than the area of ​​the second side surface 220, wherein the first side surface 210 can be understood as the large surface of the electrode, and the second side surface 220 can be set as one of the side surfaces in the circumferential direction of the first side surface 210. In addition, the battery cell 200 to be tested usually has a pole ear, which is usually arranged on one of the second side surfaces 220 with a relatively small area. The battery cell 200 to be tested is usually formed by a winding process, a lamination process, etc. The specific types of the battery cell 200 to be tested include square shell batteries, cylindrical batteries, soft-pack batteries and blade batteries, etc., wherein square shell batteries, soft-pack batteries and blade batteries are generally plate-shaped and usually have four corner areas 201. The battery device detection equipment 100 can irradiate the corner area 201 through the radiation device 120 to detect the misalignment of the anode and cathode plates, the gap between the anode and cathode plates, etc., and can also irradiate the central area 202 through the radiation device 120 to detect the surface wrinkles of the battery cell 200 to be tested, which can be understood as detecting the wrinkles on the large surface of the electrode of the battery cell 200 to be tested (for example, the first side surface 210 mentioned above or the upward surface of the battery cell 200 to be tested in the figure).

[0052] The battery device detection device 100 includes a detection device 110 and a radiation device 120. The detection device 110 is used to carry the battery cell 200 to be tested, and the detection device 110 is also used to receive radiation that passes through at least two corner areas 201 of the battery cell 200 to be tested; the radiation device 120 is used to be arranged on the side of the battery cell 200 to be tested that is away from the detection device 110 and is spaced from the battery cell 200 to be tested, and the radiation emitted by the radiation device 120 is used to cover at least two corner areas 201 of the battery cell 200 to be tested. For example, referring to Figure 3 and Figure 4 The radiation device 120 may emit radiation to cover the four corner regions 201 and the center region 202 of the battery cell 200 to be tested.

[0053] The detection device 110 may be configured to include at least one flat panel detector, and the radiation device 120 may be configured to include at least one radiation source for emitting X-rays, wherein one radiation source has a corresponding focus. It is understandable that the detection device 110 may also include a radiation conversion module (such as an X-ray conversion module), a photoelectric conversion module, a signal readout and transmission module, etc., so as to convert the energy of X-rays and other radiation into a recordable electrical signal. Specifically, the energy of X-rays and other radiation received by the detection device 110 may be measured, and then an electrical signal that is proportional to the radiation energy or has other corresponding relationships may be generated. Figure 3 and Figure 4The detection device 110 and the radiation device 120 can be respectively arranged on both sides of the battery cell 200 to be tested. In addition, the radiation device 120 is arranged at a distance from the battery cell 200 to be tested, which can be understood as a certain distance between the radiation device 120 and the battery cell 200 to be tested.

[0054] In this embodiment, when the battery device detection device 100 is in use, the detection device 110 can carry the battery cell 200 to be tested, and the radiation device 120 is arranged on the side of the battery cell 200 to be tested facing away from the detection device 110 and spaced from the battery cell 200 to be tested, so that the detection device 110 is closer to the cathode and anode plates of the battery cell 200 to be tested; Figure 4 and Figure 5 For example, in the above embodiment, the detection device 110 is changed from the Z0 position in the related art to the Z1 position, so that the edge blur area W0 is changed to a narrower boundary blur area W1, thereby reducing the degree of boundary blur caused by the focal size of the radiation device 120, and facilitating the improvement of imaging clarity for anode and cathode sheets with more layers and thinner thickness. Figure 6 The imaging effect diagram of an embodiment of a battery device detection device 100 is shown, wherein the imaging position can refer to Figure 4 AA position in; refer to Figure 6 It can be seen that the imaging of the battery device detection device 100 in the above embodiment is relatively clear.

[0055] In addition, when the detection device 110 carries the battery cell 200 to be tested, the distance between the detection device 110 and the cathode and anode plates of the battery cell 200 to be tested is the dimension F21 in the figure, and the magnification factor becomes (F11+F21) / F11; because the detection device 110 carries the battery cell 200 to be tested, F21 becomes smaller, and the imaging magnification factor of the detection device 110 is smaller, and the magnification factor of this method is closer to 1; because the magnification factor is relatively small, the imaging coverage range of the detection device 110 is larger, and the rays emitted by the ray device 120 cover at least two corner areas 201 of the battery cell 200 to be tested, which is conducive to reducing the number of focal points required by the ray device 120. For example, it can be referred to Figure 4 The radiation device 120 includes only one radiation source, thereby reducing the corresponding radiation generating devices (such as the corresponding radiation cathode, radiation anode, etc.) and protective devices, reducing the equipment cost, and saving the factory area used by the battery device detection device 100.

[0056] In some embodiments, continue to refer to Figure 3 and Figure 4 The detection device 110 includes at least two corner detectors 111 arranged at intervals. The corner detectors 111 are used to carry the corner area 201. The radiation emitted by the radiation device 120 is at least used to cover the corner area 201 carried by the corner detectors 111.

[0057] Among them, the corner detector 111 can be understood as a detector used to detect the corner area 201 of the battery cell 200 to be tested. Specifically, it can be used to detect the misalignment of the anode and cathode sheets, the gap between the anode and cathode sheets, etc. by carrying the corner area 201, wherein the corner detector 111 is set as a flat-panel detector, etc.

[0058] In some embodiments, reference Figure 3 , the detection device 110 may include four corner detectors 111 arranged at intervals, and the four corner detectors 111 are respectively used to carry the four corners of the first side 210, which can be understood as the four corner detectors 111 are respectively used to carry the four corner areas 201 of the battery cell 200 to be tested. In this embodiment, the detection device 100 of the battery device carries the four corners of the first side 210 respectively through the four corner detectors 111, thereby further improving the imaging clarity of the anode and cathode plate misalignment and the gap between the anode and cathode plates of the battery cell 200 to be tested for each corner area 201; in addition, the detection device 100 of the battery device reduces the overall area of ​​the detection device 110 by arranging the four corner detectors 111 at intervals, thereby further reducing the equipment cost.

[0059] According to the above analysis, the detection device 100 of the battery device carries the corner area 201 of the battery cell 200 to be tested through the corner detector 111. It can be understood that the corner detector 111 is closer to the cathode and cathode sheets of the battery cell 200 to be tested, so that the edge blur area is narrower, thereby reducing the degree of boundary blur caused by the focal size of the radiation device 120, thereby improving the misalignment of the cathode and cathode sheets of the battery cell 200 to be tested and the imaging clarity of the cathode and cathode sheet gap; in addition, the detection device 100 of the battery device reduces the total detection area of ​​the detection device 110 by arranging the corner detectors 111 at intervals, for example Figure 3 The total detection area of ​​the four corner detectors 111 is small, and the overall consumables are less, thereby further reducing the equipment cost.

[0060] In some embodiments, continue to refer to Figure 3 and Figure 4 , the detection device 110 also includes a center detector 112, and the center detector 112 is arranged on the side of the corner detector 111 facing away from the radiation device 120, for example, it is arranged on the upper side in the figure. Among them, the corner detector 111 and the center detector 112 can be respectively set as flat-panel detectors. The corner detector 111 is carried on the center detector 112, for example, the corner detector 111 is in contact with the surface of the center detector 112; the area of ​​the corner detector 111 is smaller than the area of ​​the center detector 112, which can be understood as the center detector 112 is relatively large. Projection is performed along the central axis of the ray emitted by the radiation device 120, for example, along Figure 4The projection of the battery cell 200 to be tested is located within the projection of the central detector 112. It can be understood that the central detector 112 can detect the entire battery cell 200 to be tested, or it can be understood that the central detector 112 is relatively centered relative to the battery cell 200 to be tested.

[0061] In this embodiment, the battery device detection device 100 makes the projection of the battery cell 200 to be tested be located within the projection of the central detector 112, so that the surface wrinkles of the battery cell 200 to be tested can be detected through the central detector 112, for example, for detecting Figure 4 In addition, when the corner detector 111 carries the corner area 201 of the cell 200 to be tested, the corner detector 111 is carried by the center detector 112, so that the center detector 112 is closer to the cell 200 to be tested, thereby reducing the degree of boundary blur caused by the focus size at the center detector 112, which is beneficial to improving the imaging clarity of the center detector 112.

[0062] In addition, in this embodiment, reference Figure 3 The radiation device 120 can be composed of a radiation source, and the detection device 110 can be composed of the above-mentioned four corner detectors 111 and a center detector 112, so that the four corner detectors 111 can be used to detect the misalignment of the anode and cathode plates in the four corner areas 201 of the battery cell 200 to be tested, and the center detector 112 can be used to detect the wrinkles on the large surface of the plate of the battery cell 200 to be tested.

[0063] In some embodiments, the pixel size of at least part of the detection device 110 is set to be less than 30 microns. For example, the pixel size of the corner detector 111 and the pixel size of the center detector 112 can be set to be less than 30 microns respectively.

[0064] Among them, in the battery device detection device 100 in the above embodiment, the resolution is usually used to evaluate the imaging capability; the overall resolution of the battery device detection device 100 depends on the limiting resolution of the optical system and the image resolution of the detection device 110; the actual resolution presented by the final image depends on the combined influence of the two. Among them, the smaller the pixel size of the detection device 110, the higher the resolution of the detection device 110; conversely, the larger the pixel size of the detection device 110, the lower the resolution of the detection device 110.

[0065] In this embodiment, when the detection device 110 is closer to the cathode and anode plates of the battery cell 200 to be tested and the degree of boundary blur caused by the focal size of the radiation device 120 is reduced, the pixel size of the detection device 110 is set to be less than 30 microns, which is beneficial to improving the image resolution at a small magnification, thereby helping to improve the imaging clarity.

[0066] Furthermore, the pixel size of at least part of the detection device 110 can be set to be less than or equal to 20 microns. For example, the pixel size of the corner detector 111 and the pixel size of the center detector 112 can be set to be less than or equal to 20 microns respectively.

[0067] In this embodiment, the pixel size of at least part of the detection device 110 is set to be less than or equal to 20 microns, which is beneficial to further improve the image resolution under a small magnification, thereby helping to further improve the imaging clarity.

[0068] In some embodiments, reference Figure 7 and Figure 8 , the ray device 120 includes a corner ray source 121 and a center ray source 122, the corner ray source 121 and the center ray source 122 are respectively used to be arranged on the side of the battery cell 200 to be tested that is away from the detection device 110 and are respectively arranged at intervals from the battery cell 200 to be tested, for example, the corner ray source 121 and the center ray source 122 are respectively arranged on the upper side in the figure, and the corner ray source 121 and the detection device 110 carrying the battery cell 200 to be tested form a height distance H1, and the center ray source 122 and the detection device 110 carrying the battery cell 200 to be tested form a height distance H2. In addition, the ray emitted by the center ray source 122 is used to at least cover the center area 202 of the battery cell 200 to be tested, wherein only the center area 202 of the battery cell 200 to be tested can be covered while the corner area 201 is exposed, and of course, the entire battery cell 200 to be tested can also be covered; on the other hand, the ray emitted by the corner ray source 121 is used to cover at least one corner area 201 of the battery cell 200 to be tested. It can be understood that the rays emitted by the central ray source 122 mainly correspond to the central area 202 of the battery cell 200 to be tested, and the rays emitted by the corner ray source 121 mainly correspond to the corner areas 201 of the battery cell 200 to be tested.

[0069] For the radiation device 120 for emitting X-rays, the intensity of X-rays will significantly decrease as the radiation angle increases. For example, for a radiation source with an operating voltage of 4kV and an operating current of 1mA, when the radiation angle is about 20 degrees, the intensity of the X-rays is about 760μGy / s of dose ratio; when the radiation angle is about 25 degrees, the intensity of the X-rays is about 80μGy / s of dose ratio. Therefore, for a radiation source that is relatively centered relative to the battery cell 200 to be tested, there may be a situation where the dose is insufficient when irradiating the corner area 201 of the battery cell 200 to be tested; and the dose required for detecting the difference between the cathode and anode of the battery cell 200 to be tested in the corner area 201 is greater than the dose required for detecting the electrode wrinkles.

[0070] In this embodiment, referring to the above analysis, since the intensity of the rays generally decreases with the increase of the radiation angle of the rays, the detection equipment 100 of the battery device increases the radiation dose of the corner area 201 of the battery cell 200 to be tested by making the rays emitted by the central ray source 122 cover at least the central area 202 of the battery cell 200 to be tested, and the rays emitted by the corner ray source 121 cover at least one corner area 201 of the battery cell 200 to be tested, thereby improving the image signal-to-noise ratio of the corner area 201, which is beneficial to improving the imaging clarity of the corner area 201 of the battery cell 200 to be tested.

[0071] In some embodiments, reference Figure 5 The size D1 of at least one focus of the radiation device 120 is greater than or equal to 0.8 mm. For example, the size of the focus of the central radiation source 122 can be greater than or equal to 0.8 mm, or the size of the focus of the corner radiation source 121 and the size of the focus of the central radiation source 122 can be greater than or equal to 0.8 mm respectively.

[0072] Among them, for the radiation device 120 for emitting X-rays, the size of its focus can be understood as the size of the focus in a certain direction on a plane perpendicular to the irradiation direction; when other conditions are the same, the smaller the focus, the higher the resolution and the better the imaging clarity. Related technologies also usually use a radiation source with a smaller focus to improve imaging clarity.

[0073] In addition, for the radiation device 120 for emitting X-rays, the focus size measurement method includes a direct method and an indirect method. The direct method refers to directly observing the shape and size of the focus, such as using a pinhole method; the indirect method is to calculate the focus size based on a point spread function or a line spread function corresponding to the focus size, including using a knife edge method, a slit method, and a ball target method; or to detect the focus size with reference to the method specified in the relevant measurement standards, such as using the measurement methods listed in GB / T26834-2011 for detection.

[0074] In this embodiment, when the image resolution is improved by setting the pixel size of the detection device 110 to be less than 30 microns, the size of at least one focus of the radiation device 120 is greater than or equal to 0.8 mm, which can improve the radiation energy and penetration of the radiation device 120. It can be understood that the overall dose of the radiation device 120 is larger, which is beneficial to make up for the insufficient radiation absorption capacity of the radiation device 120 with a smaller pixel size (if the pixel size is too small, the capacitance in the pixel is too small and can only absorb less radiation), thereby improving the image signal-to-noise ratio of the detection device 110, which is beneficial to improve the imaging clarity of the battery cell 200 to be tested.

[0075] Furthermore, the size of at least one focus of the radiation device 120 can be set to be greater than or equal to 1 mm. For example, the size of the focus of the central radiation source 122 can be greater than or equal to 1 mm, or the size of the focus of the corner radiation source 121 and the size of the focus of the central radiation source 122 can be greater than or equal to 1 mm respectively.

[0076] In this embodiment, when the image resolution is improved by setting the pixel size of the detection device 110 to be less than 30 microns, the size of at least one focus of the radiation device 120 is greater than or equal to 1 mm, which can further improve the radiation energy and penetration of the radiation device 120, and help to make up for the insufficient radiation absorption capacity of the radiation device 120 with a smaller pixel size, thereby further improving the image signal-to-noise ratio of the detection device 110, which is beneficial to further improve the imaging clarity of the battery cell 200 to be tested.

[0077] In some embodiments, reference Figure 8 , along the direction perpendicular to the bearing surface of the detection device 110, for example, along the up-down direction in the figure, the distance H1 from the corner ray source 121 to the detection device 110 is smaller than the distance H2 from the center ray source 122 to the detection device 110, which can be understood as the corner ray source 121 is closer to the detection device 110. Among them, the distance H1 from the corner ray source 121 to the detection device 110 and the distance H2 from the center ray source 122 to the detection device 110 should be measured based on the same position of the detection device 110, for example, the upper surface of the above-mentioned center detector 112 is used as the measurement reference.

[0078] In this embodiment, the distance from the corner ray source 121 to the detection device 110 is smaller than the distance from the central ray source 122 to the detection device 110, and the corner detector 111 is relatively closer to the corner area 201 of the battery cell 200 to be tested, which can be understood as being closer to the corner area 201 in the height direction, or can be understood as being closer to the corner area 201 along the central axis of the emitted rays, which is beneficial to further increase the radiation dose of the corner area 201 of the battery cell 200 to be tested, thereby improving the image signal-to-noise ratio of the corner area 201, which is beneficial to improve the imaging clarity of the corner area 201 of the battery cell 200 to be tested.

[0079] In some embodiments, continue to refer to Figure 7 and Figure 8 The radiation device 120 includes two corner radiation sources 121. The first corner radiation source 121, the central radiation source 122 and the second corner radiation source 121 are arranged in a direction parallel to the battery cell 200 to be tested, for example, along Figure 7 The first corner ray source 121 emits rays for covering the two adjacent corner regions 201 of the battery cell to be tested 200, for example, covering Figure 7 The rays emitted by the second corner ray source 121 are used to cover the other two corner regions 201 adjacent to the battery cell 200 to be tested, for example, Figure 7 The two corner areas 201 on the middle right.

[0080] In this embodiment, the rays emitted by the first corner ray source 121 are used to cover two adjacent corner areas 201 of the battery cell 200 to be tested, and the rays emitted by the second corner ray source 121 are used to cover the other two adjacent corner areas 201 of the battery cell 200 to be tested, thereby improving the detection efficiency of each corner area 201 of the battery cell 200 to be tested while improving the imaging clarity of the corner area 201 of the battery cell 200 to be tested. For example, the four corner areas 201 of the battery cell 200 to be tested can be detected simultaneously by the first corner ray source 121 and the second corner ray source 121.

[0081] In some embodiments, reference Figure 7 and Figure 8 On the plane where the central detector 112 is located, the distance L1 from the side edge of the ray emitted by the central ray source 122 to the center of the corner detector 111 is smaller than the distance L2 from the center of the corner detector 111 to the center of the central detector 112 .

[0082] In this embodiment, the distance L1 from the side edge of the ray emitted by the central ray source 122 to the center of the corner detector 111 is smaller than the distance L2 from the center of the corner detector 111 to the center of the central detector 112, which is beneficial to reducing the radiation angle of the central ray source 122 and reducing the ray energy consumption, and is beneficial to increasing the ray dose of the corner area 201 of the battery cell 200 to be tested through the corner ray source 121, thereby improving the image signal-to-noise ratio of the corner area 201, which is beneficial to improving the imaging clarity of the corner area 201 of the battery cell 200 to be tested.

[0083] In some embodiments, reference Figure 7 and Figure 8 , the distance from the central axis of the ray emitted by the central ray source 122 to the center of the central detector 112 is smaller than the distance from the central axis of the ray emitted by the corner ray source 121 to the center of the central detector 112; for example, referring to Figure 7 and Figure 8 The distance from the central axis of the ray emitted by the central ray source 122 to the center of the central detector 112 can be set to be approximately equal to zero, and the distance from the central axis of the ray emitted by the corner ray source 121 to the center of the central detector 112 can refer to the dimension L2 in the figure.

[0084] In this embodiment, the distance from the central axis of the ray emitted by the central ray source 122 to the center of the central detector 112 is smaller than the distance from the central axis of the ray emitted by the corner ray source 121 to the center of the central detector 112, which is beneficial for increasing the ray dose of the corner area 201 of the battery cell 200 to be tested through the corner ray source 121, thereby improving the image signal-to-noise ratio of the corner area 201, which is beneficial for improving the imaging clarity of the corner area 201 of the battery cell 200 to be tested.

[0085] In some embodiments, reference Fig. 9 The battery device detection device 100 further includes a partition 130, which is disposed on a side of the central detector 112 facing the radiation device 120, for example, Fig. 9 The upper side of the central detector 112 is projected along the central axis of the ray emitted by the central ray source 122, and the projection of the ray emitted by the central ray source 122 and the projection of the ray emitted by the corner ray source 121 overlap with the projection of the partition 130, which can be understood as the ray emitted by the central ray source 122 and the ray emitted by the corner ray source 121 are respectively irradiated on the partition 130. The partition 130 can be understood as a plate that can block at least part of the ray irradiated to itself; for example, the partition 130 can be set as a lead plate.

[0086] In this embodiment, the projection of the rays emitted by the central ray source 122 and the projection of the rays emitted by the corner ray source 121 overlap with the projection of the partition 130, which is conducive to detecting the surface wrinkles of the battery cell 200 to be tested through the central detector 112, and is conducive to reducing the radiation dose irradiated to the central detector 112 through the partition 130, thereby reducing the risk of damage to the central detector 112. In addition, if the central detector 112 is reduced to avoid the edge of the central detector 112 being damaged by irradiation, it is possible to form a blind area for detecting the wrinkles of the pole piece of the battery cell 200 to be tested; it can be understood that this embodiment is conducive to using a larger central detector 112 to reduce the risk of forming a blind area for detecting the wrinkles of the pole piece of the battery cell 200 to be tested, relative to the method of reducing the central detector 112.

[0087] Further, refer to Fig. 9 For two adjacent corner areas 201 of the battery cell 200 to be tested that are covered by the rays emitted by the corner ray source 121, the above-mentioned partition 130 can be set between the two corner areas 201, so that the partition 130 is set opposite to the side of the battery cell 200 to be tested, for example, the partition 130 on the left side of the figure is set opposite to the left side of the battery cell 200 to be tested, and the partition 130 on the right side of the figure is set opposite to the right side of the battery cell 200 to be tested.

[0088] In this embodiment, the partition 130 is arranged between two adjacent corner areas 201. The partition 130 can reduce the radiation dose irradiated to the central detector 112 near the edge position of the battery cell to be tested 200, thereby reducing the risk of damage to the central detector 112; in addition, the partition 130 can also reduce the detection interference on the central area 202 of the battery cell to be tested by being arranged near the edge position of the battery cell to be tested 200.

[0089] In another embodiment, reference Fig.10 ,in Fig.10 A schematic diagram of another embodiment of the battery device detection equipment 100 is shown; the detection device 110 includes a corner detector 111 and a center detector 112, the area of ​​the corner detector 111 is smaller than the area of ​​the center detector 112, and it can be understood that the center detector 112 is relatively large; wherein, along the central axis of the ray emitted by the ray device 120, the projection of the battery cell 200 to be tested is located within the outer boundary of the projection of the center detector 112; in addition, the center detector 112 is arranged beside all the corner detectors 111, and the center detector 112 is used to carry the battery cell 200 to be tested; it can be understood that the center detector 112 forms an independent detection station, and all the corner detectors 111 form another independent station. It can be understood that, with reference to Fig.10The central ray source 122 arranged corresponding to the central detector 112 is arranged beside all the corner ray sources 121 arranged corresponding to the corner detectors 111 .

[0090] When the detection equipment 100 of the battery device is in use, the battery cell 200 to be tested can be first placed on the detection station corresponding to the central detector 112 for detection, and then the battery cell 200 to be tested can be placed on another detection station corresponding to all the corner detectors 111 for detection; of course, the battery cell 200 to be tested can also be first placed on the detection station corresponding to all the corner detectors 111 for detection, and then the battery cell 200 to be tested can be placed on another detection station corresponding to the central detector 112 for detection, so as to facilitate parallel imaging and to facilitate the replacement of the central detector 112 or the corner detector 111 separately.

[0091] In this embodiment, the battery device detection equipment 100 sets the central detector 112 next to all the corner detectors 111, thereby reducing the risk of overlap between the rays obtained by the central detector 112 and the rays obtained by the corner detectors 111, reducing the radiation dose irradiating the central detector 112, and reducing the risk of damage to the central detector 112.

[0092] Reference Fig. 9In one embodiment of the present application, a battery device detection device 100 is used for a battery cell 200 to be tested. The battery device detection device 100 includes a detection device 110 and a radiation device 120. The detection device 110 is used to carry the battery cell 200 to be tested. The detection device 110 is also used to receive radiation that passes through at least two corner areas 201 of the battery cell 200 to be tested. The radiation device 120 is used to be arranged on a side of the battery cell 200 to be tested that is away from the detection device 110 and is spaced apart from the battery cell 200 to be tested. The radiation emitted by the radiation device 120 is used to cover at least two corner areas 201 of the battery cell 200 to be tested. The detection device 110 includes at least two corner detectors 111 spaced apart. The corner detector 111 is used to carry the corner area 201. The radiation emitted by the radiation device 120 is used to cover at least the corner area 201 carried by the corner detector 111. The battery cell 200 to be tested has a first side surface 210 facing away from the radiation device 120 and a second side surface 220 arranged beside the first side surface 210, and the area of ​​the first side surface 210 is larger than the area of ​​the second side surface 220; the detection device 110 includes four corner detectors 111 arranged at intervals, and the four corner detectors 111 are respectively used to carry the four corners of the first side surface 210. The detection device 110 also includes a center detector 112, which is arranged on the side of the corner detector 111 facing away from the radiation device 120; the corner detector 111 is carried on the center detector 112, and the area of ​​the corner detector 111 is smaller than the area of ​​the center detector 112; the projection is performed along the central axis of the radiation emitted by the radiation device 120, and the projection of the battery cell 200 to be tested is located within the projection of the center detector 112. The ray device 120 includes a corner ray source 121 and a center ray source 122. The corner ray source 121 and the center ray source 122 are respectively used to be arranged on the side of the battery cell 200 to be tested that is away from the detection device 110 and are respectively arranged at intervals from the battery cell 200 to be tested; the ray emitted by the center ray source 122 is used to cover at least the center area 202 of the battery cell 200 to be tested, and the ray emitted by the corner ray source 121 is used to cover at least one corner area 201 of the battery cell 200 to be tested. In the direction perpendicular to the bearing surface of the detection device 110, the distance from the corner ray source 121 to the detection device 110 is smaller than the distance from the center ray source 122 to the detection device 110. The radiation device 120 includes two corner radiation sources 121. The first corner radiation source 121, the center radiation source 122 and the second corner radiation source 121 are arranged in a direction parallel to the battery cell 200 to be tested. The radiation emitted by the first corner radiation source 121 is used to cover two adjacent corner areas 201 of the battery cell 200 to be tested, and the radiation emitted by the second corner radiation source 121 is used to cover the other two adjacent corner areas 201 of the battery cell 200 to be tested.The distance from the central axis of the ray emitted by the central ray source 122 to the center of the central detector 112 is smaller than the distance from the central axis of the ray emitted by the corner ray source 121 to the center of the central detector 112; on the plane where the central detector 112 is located, the distance from the side edge of the ray emitted by the central ray source 122 to the center of the corner detector 111 is smaller than the distance from the center of the corner detector 111 to the center of the central detector 112. The battery device detection device 100 further includes a partition 130, which is disposed on the side of the central detector 112 facing the ray device 120; the projection along the central axis of the ray emitted by the central ray source 122 and the projection of the ray emitted by the corner ray source 121 overlap with the projection of the partition 130 respectively. For two adjacent corner regions 201 of the battery cell 200 to be tested that are covered by the ray emitted by the corner ray source 121, the partition 130 is disposed between the two corner regions 201. The pixel size of at least part of the detection device 110 is set to be less than or equal to 20 micrometers. The size of at least one focus of the radiation device 120 is greater than or equal to 1 millimeter.

[0093] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery device detection device, characterized in that: The detection equipment of the battery device comprises: A detection device, the detection device is used to carry the battery cell to be tested, and the detection device is also used to receive rays passing through at least two corner areas of the battery cell to be tested; A ray device is used to be arranged on a side of the battery cell to be tested that is away from the detection device and is spaced apart from the battery cell to be tested, and the rays emitted by the ray device are used to cover at least two corner areas of the battery cell to be tested.

2. The battery device detection device according to claim 1, characterized in that: The detection device comprises at least two corner detectors arranged at intervals, wherein the corner detectors are used to carry the corner area, and the radiation emitted by the radiation device is used to at least cover the corner area carried by the corner detectors.

3. The battery device detection device according to claim 2, characterized in that: The battery cell to be tested has a first side surface facing away from the radiation device and a second side surface arranged beside the first side surface, and the area of ​​the first side surface is larger than the area of ​​the second side surface; The detection device includes four corner detectors arranged at intervals, and the four corner detectors are respectively used to carry four corners of the first side surface.

4. The battery device detection device according to claim 2 or 3, characterized in that: The detection device also includes a center detector, which is arranged on the side of the corner detector facing away from the radiation device; the corner detector is carried on the center detector, and the area of ​​the corner detector is smaller than the area of ​​the center detector; and the projection is performed along the central axis of the radiation emitted by the radiation device, and the projection of the battery cell to be tested is located within the projection of the center detector.

5. The battery device detection device according to claim 4, characterized in that: The ray device comprises a corner ray source and a center ray source, wherein the corner ray source and the center ray source are respectively used to be arranged at a side of the battery cell to be tested that is away from the detection device and are respectively arranged at intervals from the battery cell to be tested; The rays emitted by the central ray source are used to cover at least the central area of ​​the battery cell to be tested, and the rays emitted by the corner ray source are used to cover at least one corner area of ​​the battery cell to be tested.

6. The battery device detection device according to claim 5, characterized in that: Along a direction perpendicular to the bearing surface of the detection device, the distance from the corner ray source to the detection device is smaller than the distance from the central ray source to the detection device.

7. The battery device detection device according to claim 5, characterized in that: The ray device includes two corner ray sources, wherein the first corner ray source, the center ray source and the second corner ray source are arranged in a direction parallel to the battery cell to be tested; the rays emitted by the first corner ray source are used to cover two adjacent corner areas of the battery cell to be tested, and the rays emitted by the second corner ray source are used to cover the other two adjacent corner areas of the battery cell to be tested.

8. The battery device detection device according to claim 7, characterized in that: The distance from the central axis of the ray emitted by the central ray source to the center of the central detector is smaller than the distance from the central axis of the ray emitted by the corner ray source to the center of the central detector; and / or, On the plane where the central detector is located, the distance from the side edge of the ray emitted by the central ray source to the center of the corner detector is smaller than the distance from the center of the corner detector to the center of the central detector.

9. The battery device detection device according to any one of claims 5 to 8, characterized in that: The detection equipment of the battery device also includes a partition, which is arranged on the side of the central detector facing the radiation device; projection is performed along the central axis of the rays emitted by the central ray source, and the projection of the rays emitted by the central ray source and the projection of the rays emitted by the corner ray source overlap with the projection of the partition respectively.

10. The battery device detection device according to claim 7 or 8, characterized in that: The detection equipment of the battery device also includes a partition, which is arranged on the side of the central detector facing the radiation device; for two adjacent corner areas of the battery cell to be tested that are covered by the rays emitted by the corner ray source, the partition is arranged between the two corner areas.

11. The battery device detection device according to claim 2 or 3, characterized in that: The detection device further includes a central detector, and the area of ​​the corner detector is smaller than that of the central detector; the central detector is arranged beside all the corner detectors, and the central detector is used to carry the battery cell to be tested; Projection is performed along the central axis of the ray emitted by the ray device, and the projection of the battery cell to be tested is located within the outer boundary of the projection of the central detector.

12. The battery device detection device according to claim 1, characterized in that: The pixel size of at least part of the detection device is set to be less than 30 microns.

13. The battery device detection device according to claim 12, characterized in that: The pixel size of at least part of the detection device is set to be less than or equal to 20 microns.

14. The battery device detection device according to claim 12 or 13, characterized in that: The size of at least one focal point of the radiation device is greater than or equal to 0.8 mm.

15. The battery device detection device according to claim 14, characterized in that: The size of at least one focal point of the radiation device is greater than or equal to 1 mm.

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