Detection Device for Battery Device

Abstract

The present application discloses a detection device for a battery device, which relates to the technical field of battery manufacturing. Among them, the detection device for the battery device includes a detection device and a ray 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 regions of the battery cell to be tested; the ray device is used to be arranged on the side of the battery cell to be tested facing away from the detection device and is arranged at an interval from the battery cell to be tested, and the rays emitted by the ray device are used to cover at least two corner regions of the battery cell to be tested. When the detection device for the battery device is in use, it can carry the battery cell to be tested through the detection device, and arrange the ray device on the side of the battery cell to be tested facing away from the detection device and at an interval 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 ray device, and facilitating improving the imaging clarity of the anode and cathode plates with more layers and thinner thicknesses.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing, and particularly to a detection device for a battery device. Background Art

[0002] With the rapid development of new energy technologies, major automotive OEMs and users have paid more attention to battery safety; while improving the production efficiency of battery cells, each battery cell manufacturer has also exercised more stringent control and comprehensive detection of battery cells that may have defects during the manufacturing process.

[0003] The battery cells of lithium batteries are formed by winding processes, laminating processes, etc. The battery cells include multiple layers of anode and cathode sheets, and the anode and cathode sheets are relatively thin. Related technologies use X-ray detection devices to detect the misalignment amount of the anode and cathode sheets of the battery cells, the gap between the anode and cathode sheets, and the wrinkles on the large surface of the sheets; among them, related technologies usually magnify the image to a large multiple to improve the imaging clarity of the anode and cathode sheets with a large number of layers and a small thickness, but there is still room for improvement in imaging clarity. Summary of the Invention

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

[0005] To achieve the above object, the detection device for a battery device proposed in this application includes a detection device and a ray 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 regions of the battery cell to be tested; the ray device is used to be arranged on the side of the battery cell to be tested facing away from the detection device and 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 regions of the battery cell to be tested.

[0006] When the detection device for a battery device provided in this application is in use, it can carry the battery cell to be tested through the detection device, and arrange the ray device on the side of the battery cell to be tested facing away from the detection device and spaced apart from the battery cell to be tested, so that the detection device is closer to the anode and cathode sheets of the battery cell to be tested, thereby reducing the degree of boundary blur caused by the focus size of the ray device, and facilitating the improvement of imaging clarity for the anode and cathode sheets with a large number of layers and a small 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. By covering at least two corner regions of the battery cell to be tested with the rays emitted by the ray device, it is beneficial to reduce the number of foci required by the ray device, reduce the corresponding ray generation device and protection device, reduce the equipment cost, and also save the floor area of the detection device for the battery device in the factory building.

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

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

[0009] Optionally, the battery cell to be measured has a first side facing away from the ray device and a second side arranged beside the first side, and the area of the first side is larger than the area of the second side; the detection device includes four corner detectors arranged at intervals, and the four corner detectors are respectively used to carry the four corners of the first side.

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

[0011] Optionally, the detection device further includes a center detector, and the center detector is arranged on the side of the corner detector facing away from the ray 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; when projected along the central axis of the rays emitted by the ray device, the projection of the battery cell to be measured is located within the projection of the center detector.

[0012] At this time, the detection device of the battery device can detect the surface wrinkles of the battery cell to be measured through the center detector by making the projection of the battery cell to be measured located within the projection of the center detector; in addition, when the corner detector carries the corner area of the battery cell to be measured, the corner detector is carried on the center detector, so that the center detector is closer to the battery cell to be measured, thereby reducing the degree of boundary blur caused by the focus size at the center detector and being beneficial to improving the imaging clarity.

[0013] Optionally, the ray device includes a corner ray source and a central ray source, which are respectively used to be arranged on the side of the battery cell to be measured facing away from the detection device and are respectively arranged at intervals from the battery cell to be measured; the rays emitted by the central ray source are at least used to cover the central area of the battery cell to be measured, and the rays emitted by the corner ray source are used to cover at least one corner area of the battery cell to be measured.

[0014] At this time, since the ray intensity generally decreases as the ray radiation angle increases, the detection device of the battery device makes the rays emitted by the central ray source cover at least the central area of the battery cell to be measured, and the rays emitted by the corner ray source cover at least one corner area of the battery cell to be measured, thereby increasing the ray dose in the corner area of the battery cell to be measured, thereby improving the image signal-to-noise ratio in the corner area, and thus facilitating improving the imaging clarity of the corner area of the battery cell to be measured.

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

[0016] At this time, the distance from the corner ray source to the detection device is less than the distance from the central ray source to the detection device, and the corner detector is relatively closer to the corner area of the battery cell to be measured, which is beneficial to further increasing the ray dose in the corner area of the battery cell to be measured, thereby improving the image signal-to-noise ratio in the corner area, and thus facilitating improving the imaging clarity of the corner area of the battery cell to be measured.

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

[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 measured, 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 measured, thereby improving the detection efficiency of each corner area of the battery cell to be measured while improving the imaging clarity of the corner area of the battery cell to be measured.

[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 less 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 less 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 less 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 increasing the ray dose in the corner area of the battery cell to be measured through the corner ray source, thereby improving the image signal-to-noise ratio in the corner area, and thus being beneficial to improving the imaging clarity in the corner area of the battery cell to be measured. The distance from the side edge of the ray emitted by the central ray source to the center of the corner detector is less than the distance from the center of the corner detector to the center of the central detector, which is beneficial to reducing the radiation angle of the central ray source and reducing the ray energy consumption, and is beneficial to increasing the ray dose in the corner area of the battery cell to be measured through the corner ray source, thereby improving the image signal-to-noise ratio in the corner area, and thus being beneficial to improving the imaging clarity in the corner area of the battery cell to be measured.

[0021] Optionally, the detection device of the battery device further includes a partition plate, and the partition plate is arranged on the side of the central detector facing the ray device; when projected along the central axis of the ray emitted by the central ray source, the projection of the ray emitted by the central ray source and the projection of the ray emitted by the corner ray source respectively form an overlap with the projection of the partition plate.

[0022] At this time, the projection of the ray emitted by the central ray source and the projection of the ray emitted by the corner ray source respectively form an overlap with the projection of the partition plate, which is beneficial to detecting the surface wrinkles of the battery cell to be measured through the central detector, and is beneficial to reducing the ray dose irradiated on the central detector through the partition plate, thereby reducing the risk of damage to the central detector.

[0023] Optionally, the detection device of the battery device further includes a partition plate, and the partition plate is arranged on the side of the central detector facing the ray device; for two adjacent corner areas of the battery cell to be measured covered by the rays emitted by the corner ray source, the partition plate is arranged between the two corner areas.

[0024] At this time, the partition plate is arranged between two adjacent corner areas, and the partition plate can reduce the ray dose irradiated on the central detector near the edge position of the battery cell to be measured, thereby reducing the risk of damage to the central detector; in addition, the partition plate can also reduce the detection interference on the central area of the battery cell to be measured by being arranged near the edge position of the battery cell to be measured.

[0025] Optionally, 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 measured; when projected along the central axis of the ray emitted by the ray device, the projection of the battery cell to be measured is within the outer boundary of the projection of the central detector.

[0026] At this time, the detection device of the battery device reduces the risk of overlap between the rays obtained by the central detector and the rays obtained by the corner detectors by arranging the central detector beside all the corner detectors, reduces the ray dose irradiated on the central detector, and reduces 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 close to the anode and cathode plates of the battery cell to be measured and reduces the degree of boundary blur caused by reducing the focal size of the ray device, setting the pixel size of the detection device to be less than 30 microns is beneficial to improving the image resolution at a relatively small magnification, and thus beneficial to improving 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, setting the pixel size of at least part of the detection device to be less than or equal to 20 microns is beneficial to further improving the image resolution at a relatively small magnification, and thus beneficial to further improving the imaging clarity.

[0031] Optionally, the size of at least one focus of the ray 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 be less than 30 microns, the size of at least one focus of the ray device being greater than or equal to 0.8 mm can improve the ray energy and penetration power of the ray device, is beneficial to making up for the deficiency of the ray absorption ability of the ray device with a relatively small pixel size, and thus improves the image signal-to-noise ratio of the detection device, and is thus beneficial to improving the imaging clarity of the battery cell to be measured.

[0033] Optionally, the size of at least one focus of the ray 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 be less than 30 microns, the size of at least one focal spot of the ray device is greater than or equal to 1 mm, which can further improve the ray energy and penetration power of the ray device, help make up for the deficiency of the ray absorption ability of the ray device with a smaller pixel size, thus further improving the image signal-to-noise ratio of the detection device, and being conducive to further improving the imaging clarity of the battery cell to be measured. Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0036] Figure 1 It is a schematic structural diagram of an embodiment of a ray detection device in the related art;

[0037] Figure 2 It is a schematic use diagram of an embodiment of a ray detection device in the related art;

[0038] Figure 3 It is a schematic structural diagram of an embodiment of a detection device for a battery device provided by the present application;

[0039] Figure 4 It is a front view schematic diagram of an embodiment of a detection device for a battery device provided by the present application;

[0040] Figure 5 It is a schematic use diagram of an embodiment of a detection device for a battery device provided by the present application;

[0041] Figure 6 It is an imaging effect diagram of an embodiment of a detection device for a battery device provided by the present application;

[0042] Figure 7 It is a schematic structural diagram of another embodiment of a detection device for a battery device provided by the present application;

[0043] Figure 8 It is a front view schematic diagram of another embodiment of a detection device for a battery device provided by the present application;

[0044] Figure 9 It is a schematic structural diagram of another embodiment of a detection device for a battery device provided by the present application;

[0045] Figure 10 It is a schematic use diagram of another embodiment of a detection device for a battery device provided by the present application.

[0046] Description of the reference numerals in the drawings:

[0047] 100. Detection device for battery device;

[0048] 110. Detection device; 111. Corner detector; 112. Central detector;

[0049] 120. Ray device; 121. Corner ray source; 122. Central ray source;

[0050] 130. Partition;

[0051] 200. Battery cell to be tested; 201. Corner area; 202. Central area; 210. First side; 220. Second side.

[0052] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0053] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0054] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this application, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0055] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of this application, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art 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.

[0056] With the rapid development of new energy technologies, major automotive OEMs and users have placed greater emphasis on battery safety. While improving the production efficiency of battery cells, each cell manufacturer has also exercised more stringent control and comprehensive inspection over battery cells that may have defects during the manufacturing process.

[0057] The battery cells of lithium batteries are formed through processes such as winding and stacking. The battery cells include multiple layers of anode and cathode sheets, and the anode and cathode sheets are relatively thin. Related technologies use X-ray detection equipment to detect the misalignment amount of the anode and cathode sheets, the gap between the anode and cathode sheets, and the wrinkles on the large surface of the sheets. Among them, related technologies usually magnify the image to a large multiple to improve the imaging clarity of the anode and cathode sheets with a large number of layers and a small thickness, but there is still room for improvement in the imaging clarity.

[0058] Among them, Figure 1 shows a schematic structural diagram of an embodiment of the ray detection equipment in related technologies. Referring to Figure 1 , the ray detection equipment in related technologies includes a detection device 110a and a ray device 120a to detect the battery cell to be measured 200a. Among them, the battery cell to be measured 200a has a first side 210a facing away from the ray device 120a and a second side 220a disposed beside the first side 210a. The area of the first side 210a is larger than the area of the second side 220a, and the first side 210a can be understood as the large surface of the sheet. In addition, the battery cell to be measured 200a usually has a tab, and the tab is usually disposed on the second side 220a with a relatively small area. Among them, the battery cell to be measured 200a is usually formed through processes such as winding and stacking. The specific types of the battery cell to be measured 200a include square shell batteries, cylindrical batteries, soft pack batteries, and blade batteries, etc. Among them, square shell batteries, soft pack batteries, and blade batteries usually have four corner regions 201a. In related technologies, the ray detection equipment irradiates the corner regions 201a through the ray device 120a to detect the misalignment amount of the anode and cathode sheets, the gap between the anode and cathode sheets, etc.

[0059] Referring to Figure 1 , during the detection, the magnification of the ray detection equipment is equal to (F10 + F20) / F10. In addition, related technologies usually use an external carrier assembly to carry the battery cell to be measured 200a, and make the ray device 120a close to the battery cell to be measured and the detection device 110a far from the battery cell to be measured 200a, so as to obtain a large magnification and improve the imaging clarity.

[0060] However, referring to Figure 2 , since the focus of the ray device 120a usually has a certain focus size D0, when the ray device 120a detects the whole or part of the battery cell to be measured 200a, the sharpness of the imaging edge on the detection device 110a is usually insufficient, for example, it forms Figure 2the edge blurring area W0 therein. Referring to Figure 1 and Figure 2 it can be known that when pursuing a relatively large magnification factor (F10 + F20) / F10, the detection device 110a is relatively far from the battery cell 200a to be measured, and the edge blurring area W0 is wider; in addition, since the number of layers of the anode and cathode plates in the battery cell 200a to be measured is usually large and the thickness of the anode and cathode plates is thin, the interference degree between the blurring area W0 and the plate image is relatively heavy, and the edge blurring area W0 has a greater adverse impact on the imaging clarity of the anode and cathode plates.

[0061] In addition, referring to Figure 1 and Figure 2 , the related art observes the corresponding corner area 201a by adopting a relatively large magnification factor, which results in a relatively small imaging range of the detection device 110a. For example, Figure 1 in

[0062] the four corner areas 201a usually need to be correspondingly provided with four detection devices 110a.

[0063] Next, the structure of the detection device for the battery device proposed in this application will be explained in detail with specific embodiments.

[0064] Referring to Figure 3 and Figure 4 , in an embodiment of this application, the detection device 100 for the battery device is used for the battery cell 200 to be measured; it can be understood that the battery cell 200 to be measured is used to form a battery monomer, and the battery monomer can form a battery device together with a box structure or the like. It can be understood that the detection device for the battery device provided in this application can be used to detect a complete battery device, or to detect a battery monomer or a battery cell used to form a battery device.

[0065] Among them, the battery cell 200 to be measured has a first side 210 facing away from the ray device 120 and a second side 220 disposed beside the first side 210. The area of the first side 210 is larger than that of the second side 220. The first side 210 can be understood as the large surface of the electrode tab, and the second side 220 can be set as one of the sides in the circumferential direction of the first side 210. In addition, the battery cell 200 to be measured usually has a tab, and the tab is usually disposed on one of the second sides 220 with a relatively small area. Among them, the battery cell 200 to be measured is usually formed by winding process, stacking process, etc. The specific types of the battery cell 200 to be measured include square shell batteries, cylindrical batteries, soft-pack batteries, blade batteries, etc. Among them, the square shell batteries, soft-pack batteries, and blade batteries are integrally plate-shaped and usually have four corner regions 201. The detection device 100 of the battery device can irradiate the corner regions 201 through the ray device 120 to detect the misalignment amount of the anode and cathode tabs, the gap between the anode and cathode tabs, etc., and can also irradiate the central region 202 through the ray device 120 to detect the surface wrinkles of the battery cell 200 to be measured, which can be understood as detecting the wrinkles of the large surface of the electrode tab of the battery cell 200 to be measured (such as the above-mentioned first side 210 or the upward surface of the battery cell 200 in the figure).

[0066] The detection device 100 of the battery device includes a detection device 110 and a ray device 120. The detection device 110 is used to carry the battery cell 200 to be measured, and the detection device 110 is also used to receive the rays passing through at least two corner regions 201 of the battery cell 200 to be measured; the ray device 120 is used to be disposed on the side of the battery cell 200 facing away from the detection device 110 and is spaced from the battery cell 200. The rays emitted by the ray device 120 are used to cover at least two corner regions 201 of the battery cell 200. For example, referring to Figure 3 and Figure 4 , the rays emitted by the ray device 120 can be set to cover the four corner regions 201 and the central region 202 of the battery cell 200 to be measured.

[0067] Among them, the detection device 110 can be set to include at least one flat panel detector, and the ray device 120 can be set to include at least one ray source for emitting X-rays, and one ray source correspondingly has one focal point. It can be understood that the detection device 110 can also include a ray 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 rays such as X-rays into recordable electrical signals. Specifically, the energy of rays such as X-rays received by the detection device 110 can be measured, and then electrical signals proportional to the ray energy or other corresponding relationships are generated. Referring to Figure 3 and Figure 4, the detection device 110 and the ray device 120 can be respectively arranged on both sides of the battery cell 200 to be measured. In addition, the ray device 120 is arranged at an interval from the battery cell 200 to be measured, which can be understood as that there is a certain distance from the ray device 120 to the battery cell 200 to be measured.

[0068] In this embodiment, when the detection device 100 of the battery device is in use, the detection device 110 can carry the battery cell 200 to be measured, and the ray device 120 is arranged on the side of the battery cell 200 facing away from the detection device 110 and at an interval from the battery cell 200 to be measured, so that the detection device 110 is closer to the anode and cathode plates of the battery cell 200 to be measured; referring to Figure 4 and Figure 5 , for example, in the above embodiment, the detection device 110 moves from the Z0 position in the related art to the Z1 position, so that the edge blur area W0 changes to a narrower boundary blur area W1, thereby reducing the degree of boundary blur caused by the focal size of the ray device 120, and facilitating the improvement of imaging clarity for the anode and cathode plates with more layers and thinner thickness. Among them, Figure 6 shows the imaging effect diagram of an embodiment of the detection device 100 of the battery device, and the imaging position can refer to Figure 4 the A-A position in; referring to Figure 6 it can be seen that the imaging of the detection device 100 of the battery device in the above embodiment is relatively clear.

[0069] In addition, when the detection device 110 carries the battery cell 200 to be measured, the distance from the detection device 110 to the anode and cathode plates of the battery cell 200 to be measured is the dimension F21 in the figure, and the magnification becomes (F11 + F21) / F11; since the detection device 110 carries the battery cell 200 to be measured, F21 becomes smaller, and the imaging magnification of the detection device 110 is smaller, and this magnification is relatively close to 1; since the magnification 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 regions 201 of the battery cell 200 to be measured, which is beneficial to reducing the number of focal points required by the ray device 120. For example, it can be referred to Figure 4 and the ray device 120 only includes one ray source, thereby reducing the corresponding ray generation device (such as the corresponding ray cathode, ray anode, etc.) and the protection device, reducing the equipment cost, and also saving the floor area of the detection device 100 of the battery device for the workshop.

[0070] 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 regions 201, and the rays emitted by the ray device 120 are at least used to cover the corner regions 201 carried by the corner detectors 111.

[0071] Among them, the corner detector 111 can be understood as a detector for detecting the corner area 201 of the battery cell 200 to be measured, and can be specifically used to detect the misalignment amount of the anode and cathode plates, the gap between the anode and cathode plates, etc. by carrying the corner area 201. The corner detector 111 is set as a flat panel detector, etc.

[0072] In some embodiments, referring to Figure 3 , the detection device 110 may include four corner detectors 111 arranged at intervals. The four corner detectors 111 are respectively used to carry the four corners of the first side 210, and 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 measured. In this embodiment, the detection device 100 of the battery device respectively carries the four corners of the first side 210 through the four corner detectors 111, thereby further improving the imaging clarity of the misalignment amount of the anode and cathode plates and the gap between the anode and cathode plates of the battery cell 200 to be measured 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.

[0073] 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 measured through the corner detector 111, which can be understood that the corner detector 111 is relatively close to the anode and cathode plates of the battery cell 200 to be measured, so the edge blur area is relatively narrow, thereby reducing the degree of boundary blur caused by the focal size of the radiation device 120, and thus improving the imaging clarity of the misalignment amount of the anode and cathode plates and the gap between the anode and cathode plates of the battery cell 200 to be measured; 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 in

[0074] In some embodiments, continuing to refer to Figure 3 and Figure 4 , the detection device 110 further includes a central detector 112. The central detector 112 is arranged on the side of the corner detector 111 facing away from the radiation device 120, for example, arranged on the upper side in the figure. Among them, the corner detector 111 and the central detector 112 can be respectively set as flat panel detectors. The corner detector 111 is carried on the central detector 112, for example, the corner detector 111 abuts on the surface of the central detector 112; the area of the corner detector 111 is smaller than the area of the central detector 112, which can be understood that the central detector 112 is relatively large. Project along the central axis of the ray emitted by the radiation device 120, for example, along Figure 4Project in the vertical direction. The projection of the battery cell 200 to be measured 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 measured, or it can be understood that the central detector 112 is relatively centered with respect to the battery cell 200 to be measured.

[0075] In this embodiment, the detection device 100 of the battery device can detect the surface wrinkles of the battery cell 200 to be measured through the central detector 112 by making the projection of the battery cell 200 to be measured located within the projection of the central detector 112. For example, it is used to detect Figure 4 the wrinkles on the upper and lower surfaces of the battery cell 200 to be measured. In addition, when the corner detector 111 bears the corner area 201 of the battery cell 200 to be measured, the corner detector 111 is borne on the central detector 112, so that the central detector 112 is closer to the battery cell 200 to be measured, thereby reducing the degree of boundary blur caused by the focal size at the central detector 112, which is beneficial to improving the imaging clarity of the central detector 112.

[0076] In addition, in this embodiment, referring to Figure 3 , the ray device 120 can be composed of a single ray source, and the detection device 110 can be composed of the above four corner detectors 111 and a central detector 112, so as to detect the misalignment amount of the anode and cathode tabs in the four corner areas 201 of the battery cell 200 to be measured by using the four corner detectors 111, and detect the wrinkles on the large surface of the tabs of the battery cell 200 to be measured by using the central detector 112.

[0077] 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 sizes of the above corner detector 111 and central detector 112 can be respectively set to be less than 30 microns.

[0078] Among them, in the detection device 100 of the battery device in the above embodiment, the imaging ability is usually evaluated by the resolution; the overall resolution of the detection device 100 of the battery device depends on the limit 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.

[0079] In this embodiment, when the detection device 110 is relatively close to the anode and cathode plates of the battery cell 200 to be measured, reducing the degree of boundary blur caused by reducing the focal spot size of the ray device 120, 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 relatively small magnification, and thus beneficial to improving the imaging clarity.

[0080] 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 sizes of the above-mentioned corner detectors 111 and the central detector 112 can be set to be less than or equal to 20 microns respectively.

[0081] 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 improving the image resolution at a relatively small magnification, and thus beneficial to further improving the imaging clarity.

[0082] In some embodiments, referring to Figure 7 and Figure 8 , the ray device 120 includes a corner ray source 121 and a central ray source 122. The corner ray source 121 and the central ray source 122 are respectively used to be arranged on the side of the battery cell 200 to be measured facing away from the detection device 110 and are respectively arranged at intervals from the battery cell 200 to be measured. For example, the corner ray source 121 and the central ray source 122 are respectively arranged on the upper side in the figure, and the corner ray source 121 forms a height distance H1 from the detection device 110 carrying the battery cell 200, and the central ray source 122 forms a height distance H2 from the detection device 110 carrying the battery cell 200. In addition, the rays emitted by the central ray source 122 are at least used to cover the central area 202 of the battery cell 200 to be measured, where only the central area 202 of the battery cell 200 to be measured can be covered while leaving the corner area 201 exposed. Of course, the entire battery cell 200 to be measured can also be covered; on the other hand, the rays emitted by the corner ray source 121 are used to cover at least one corner area 201 of the battery cell 200 to be measured. 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 measured, and the rays emitted by the corner ray source 121 mainly correspond to the corner area 201 of the battery cell 200 to be measured.

[0083] For the radiation device 120 that emits X-rays, the X-ray intensity will significantly decrease as the radiation angle increases. For example, for a radiation source with an operating voltage of 4 kV and an operating current of 1 mA, when the radiation angle is about 20 degrees, the X-ray intensity is about 760 μGy / s in terms of dose ratio; when the radiation angle is about 25 degrees, the X-ray intensity is about 80 μGy / s in terms of dose ratio. Therefore, for a radiation source that is relatively centered with respect to the battery cell 200 to be measured, there may be a situation where the dose is insufficient when irradiating the corner region 201 of the battery cell 200 to be measured; moreover, the dose required for detecting the anode-cathode difference in the corner region 201 of the battery cell 200 to be measured is larger than the dose for detecting the pole piece wrinkles.

[0084] In this embodiment, referring to the above analysis, since the intensity of the rays generally decreases as the radiation angle of the rays increases, the detection device 100 of the battery device makes the rays emitted by the central radiation source 122 cover at least the central region 202 of the battery cell 200 to be measured, and the rays emitted by the corner radiation source 121 cover at least one corner region 201 of the battery cell 200 to be measured, thereby increasing the ray dose in the corner region 201 of the battery cell 200 to be measured, thereby improving the signal-to-noise ratio of the image in the corner region 201, and thus facilitating the improvement of the imaging clarity of the corner region 201 of the battery cell 200 to be measured.

[0085] In some embodiments, referring to 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 made 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 made greater than or equal to 0.8 mm respectively.

[0086] Among them, for the radiation device 120 that emits 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; under the condition that other conditions are the same, the smaller the focus, the higher the resolution and the better the imaging clarity, and the related technology usually adopts a radiation source with a smaller focus to improve the imaging clarity.

[0087] In addition, for the radiation device 120 that emits X-rays, the methods for measuring the size of the focus include the direct method and the indirect method. The direct method refers to directly observing the shape and size of the focus, such as using the pinhole method; the indirect method calculates the size of the focus according to the point spread function or line spread function corresponding to the focus size, including using the edge method, the slit method and the spherical target method; or detecting the size of the focus according to the methods specified in the relevant measurement standards, such as detecting using the measurement methods listed in GB / T26834-2011.

[0088] In this embodiment, when the pixel size of the detection device 110 is set to be less than 30 microns to improve the image resolution, the size of at least one focus of the ray device 120 is greater than or equal to 0.8 mm, which can improve the ray energy and penetration power of the ray device 120. It can be understood that the overall dose of the ray device 120 is relatively large, which is beneficial to make up for the deficiency of the ray absorption ability of the ray device 120 with a small pixel size (when the pixel size is too small, the capacitance in the pixel is too small and can only absorb a small amount of rays), thereby improving the image signal-to-noise ratio of the detection device 110, and thus being beneficial to improving the imaging clarity of the battery cell 200 to be measured.

[0089] Furthermore, the size of at least one focus of the ray device 120 can be set to be greater than or equal to 1 mm. For example, the size of the focus of the central ray source 122 can be greater than or equal to 1 mm, or the sizes of the foci of the corner ray sources 121 and the central ray source 122 can be greater than or equal to 1 mm respectively.

[0090] In this embodiment, when the pixel size of the detection device 110 is set to be less than 30 microns to improve the image resolution, the size of at least one focus of the ray device 120 is greater than or equal to 1 mm, which can further improve the ray energy and penetration power of the ray device 120, is beneficial to make up for the deficiency of the ray absorption ability of the ray device 120 with a small pixel size, thereby further improving the image signal-to-noise ratio of the detection device 110, and thus being beneficial to further improving the imaging clarity of the battery cell 200 to be measured.

[0091] In some embodiments, referring to 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 less than the distance H2 from the central ray source 122 to the detection device 110, which can be understood that 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 central 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 surfaces of the above-mentioned central detectors 112 are used as the measurement benchmarks respectively.

[0092] In this embodiment, the distance from the corner ray source 121 to the detection device 110 is less than the distance from the central ray source 122 to the detection device 110. The corner detector 111 is relatively closer to the corner area 201 of the battery cell 200 to be measured. It can be understood that it is closer to the corner area 201 in the height direction, or it can be understood that it is closer to the corner area 201 along the central axis of the emitted ray. This is beneficial to further increase the ray dose in the corner area 201 of the battery cell 200 to be measured, thereby improving the image signal-to-noise ratio in the corner area 201, and thus being beneficial to improving the imaging clarity in the corner area 201 of the battery cell 200 to be measured.

[0093] In some embodiments, with continued reference to Figure 7 and Figure 8 , the ray device 120 includes two corner ray sources 121. The first corner ray source 121, the central ray source 122, and the second corner ray source 121 are arranged in a direction parallel to the battery cell 200 to be measured, for example, arranged in the direction from left to right in Figure 7 . 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 measured, for example, covering the two corner areas 201 on the left side in Figure 7 . The rays emitted by the second corner ray source 121 are used to cover another two adjacent corner areas 201 of the battery cell 200 to be measured, for example, covering the two corner areas 201 on the right side in Figure 7 .

[0094] 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 measured, and the rays emitted by the second corner ray source 121 are used to cover another two adjacent corner areas 201 of the battery cell 200 to be measured. Thus, while improving the imaging clarity in the corner area 201 of the battery cell 200 to be measured, the detection efficiency for each corner area 201 of the battery cell 200 to be measured is improved. For example, the four corner areas 201 of the battery cell 200 to be measured can be detected simultaneously by the first corner ray source 121 and the second corner ray source 121.

[0095] In some embodiments, with reference to 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 less than the distance L2 from the center of the corner detector 111 to the center of the central detector 112.

[0096] 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 less 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 measured through the corner ray source 121, thereby improving the image signal-to-noise ratio of the corner area 201, and thus being beneficial to improving the imaging clarity of the corner area 201 of the battery cell 200 to be measured.

[0097] In some embodiments, 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 is less 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 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.

[0098] 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 less 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 to increasing the ray dose of the corner area 201 of the battery cell 200 to be measured through the corner ray source 121, thereby improving the image signal-to-noise ratio of the corner area 201, and thus being beneficial to improving the imaging clarity of the corner area 201 of the battery cell 200 to be measured.

[0099] In some embodiments, referring to Figure 9 , the detection device 100 of the battery device further includes a partition 130, and the partition 130 is disposed on the side of the central detector 112 facing the ray device 120, for example, disposed on the upper side of the central detector 112 in Figure 9 ; projected along the central axis of the ray emitted by the central ray source 122, 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 respectively form an overlap with the projection of the partition 130, which can be understood that the ray emitted by the central ray source 122 and the ray emitted by the corner ray source 121 respectively irradiate on the partition 130. Among them, the partition 130 can be understood as a plate member that can block at least part of the ray irradiating on itself; for example, the partition 130 can be set as a lead plate.

[0100] 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 sources 121 respectively overlap with the projection of the partition 130, which is conducive to detecting the surface wrinkles of the battery cell 200 to be measured through the central detector 112, and is conducive to reducing the ray dose irradiated on 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 edges of the central detector 112 being irradiated and damaged, there may be a detection blind area for the pole piece wrinkles of the battery cell 200 to be measured; it can be understood that, compared with the method of reducing the central detector 112, this embodiment is conducive to using a central detector 112 with a larger area to reduce the risk of forming a detection blind area for the pole piece wrinkles of the battery cell 200 to be measured.

[0101] Furthermore, referring to Figure 9 , for two adjacent corner regions 201 of the battery cell 200 to be measured covered by the rays emitted by the corner ray sources 121, the above-mentioned partition 130 can be arranged between the two corner regions 201, so that the partition 130 is arranged opposite to the side of the battery cell 200 to be measured. For example, the left partition 130 in the figure is arranged opposite to the left side of the battery cell 200 to be measured, and the right partition 130 in the figure is arranged opposite to the right side of the battery cell 200 to be measured.

[0102] In this embodiment, the partition 130 is arranged between two adjacent corner regions 201. The partition 130 can reduce the ray dose irradiated on the central detector 112 near the edge position of the battery cell 200 to be measured, thereby reducing the risk of damage to the central detector 112; in addition, the partition 130 can also reduce the detection interference with the central region 202 of the battery cell to be measured by being arranged near the edge position of the battery cell 200 to be measured.

[0103] In another embodiment, referring to Figure 10 where Figure 10 shows a schematic diagram of the use of another embodiment of the detection device 100 of the battery device; the detection device 110 includes a corner detector 111 and a central detector 112. The area of the corner detector 111 is smaller than the area of the central detector 112, which can be understood as the central detector 112 is relatively large; among them, along the central axis of the rays emitted by the ray device 120 for projection, the projection of the battery cell 200 to be measured is within the outer boundary of the projection of the central detector 112; in addition, the central detector 112 is arranged beside all the corner detectors 111, and the central detector 112 is used to carry the battery cell 200 to be measured; it can be understood that the central detector 112 forms an independent detection station, and all the corner detectors 111 form another independent detection station. It can be understood that, referring to Figure 10, the central radiation source 122 corresponding to the central detector 112 is arranged beside all the corner radiation sources 121 corresponding to the corner detectors 111.

[0104] When the detection device 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 image acquisition and also facilitate the replacement of the central detector 112 or the corner detectors 111 individually.

[0105] In this embodiment, the detection device 100 of the battery device reduces the risk of overlap between the rays obtained by the central detector 112 and the rays obtained by the corner detectors 111 by arranging the central detector 112 beside all the corner detectors 111, reduces the radiation dose irradiated on the central detector 112, and reduces the risk of damage to the central detector 112.

[0106] Refer to Figure 9, in an embodiment of the present application, the detection device 100 of the battery device is used for the battery cell 200 to be tested. The detection device 100 of the battery device includes a detection device 110 and a ray 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 rays passing through at least two corner regions 201 of the battery cell 200 to be tested; the ray device 120 is used to be arranged on the side of the battery cell 200 facing away from the detection device 110 and is spaced from the battery cell 200. The rays emitted by the ray device 120 are used to cover at least two corner regions 201 of the battery cell 200. The detection device 110 includes at least two spaced-apart corner detectors 111. The corner detectors 111 are used to carry the corner regions 201, and the rays emitted by the ray device 120 are at least used to cover the corner regions 201 carried by the corner detectors 111. The battery cell 200 to be tested has a first side 210 facing away from the ray device 120 and a second side 220 arranged beside the first side 210. The area of the first side 210 is larger than the area of the second side 220; the detection device 110 includes four spaced-apart corner detectors 111, and the four corner detectors 111 are respectively used to carry the four corners of the first side 210. The detection device 110 further includes a central detector 112. The central detector 112 is arranged on the side of the corner detector 111 facing away from the ray device 120; the corner detector 111 is carried on the central detector 112, and the area of the corner detector 111 is smaller than the area of the central detector 112; when projected along the central axis of the rays emitted by the ray device 120, the projection of the battery cell 200 to be tested is located within the projection of the central detector 112. The ray device 120 includes a corner ray source 121 and a central ray source 122. The corner ray source 121 and the central ray source 122 are respectively used to be arranged on the side of the battery cell 200 facing away from the detection device 110 and are respectively spaced from the battery cell 200; the rays emitted by the central ray source 122 are at least used to cover the central region 202 of the battery cell 200 to be tested, and the rays emitted by the corner ray source 121 are used to cover at least one corner region 201 of the battery cell 200 to be tested. Along the direction perpendicular to the carrying surface of the detection device 110, the distance from the corner ray source 121 to the detection device 110 is less than the distance from the central ray source 122 to the detection device 110. The ray device 120 includes two corner ray sources 121. The first corner ray source 121, the central ray source 122, and the second corner ray source 121 are arranged in a row along the direction parallel to the battery cell 200 to be tested; the rays emitted by the first corner ray source 121 are used to cover two adjacent corner regions 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 regions 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 less 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 less than the distance from the center of the corner detector 111 to the center of the central detector 112. The detection device 100 of the battery device further includes a partition 130, and the partition 130 is disposed on the side of the central detector 112 facing the ray device 120; when projected along the central axis of the ray emitted by the central ray source 122, 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 respectively form an overlap with the projection of the partition 130. For two adjacent corner regions 201 covered by the ray emitted by the corner ray source 121 of the battery cell 200 to be measured, 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 microns. The size of at least one focal point of the ray device 120 is greater than or equal to 1 mm.

[0107] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields is 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, the 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; The detection device includes at least two corner detectors arranged at intervals, the corner detectors are used to carry the corner area, and the rays emitted by the ray device are at least used to cover the corner area carried by the corner detectors; the detection device also includes a center detector, and the center detector is arranged on the side of the corner detector facing away from the ray 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; 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 projection of the center detector; The ray device includes a central ray source and two corner ray sources, the corner ray source and the central ray source are respectively used to be arranged on a side of the battery cell to be tested that is away from the detection device and are respectively spaced apart from the battery cell to be tested, the first corner ray source, the central 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 central ray source are at least used to cover the central area of ​​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; 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.

2. The battery device detection device according to claim 1, 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.

3. The battery device detection device according to claim 1 or 2, 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.

4. The battery device detection device according to claim 1 or 2, 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.

5. The battery device detection device according to claim 1 or 2, 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.

6. The battery device detection device according to claim 1 or 2, 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.

7. 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.

8. The battery device detection device according to claim 7, 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.

9. The battery device detection device according to claim 7 or 8, characterized in that: The size of at least one focal point of the radiation device is greater than or equal to 0.8 mm.

10. The battery device detection device according to claim 9, 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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