Device for detecting density of coating surface of pole piece
By configuring a radiation emitter with an adjustable spot area and an electron beam focusing mechanism in the coating density detection device, the problem of low detection accuracy in the electrode thinning area was solved, thereby improving product qualification rate and battery reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-27
- Publication Date
- 2026-04-14
AI Technical Summary
Existing coating surface density testing devices cannot accurately measure the thinned area of the electrode sheet, resulting in low testing accuracy, which affects product qualification rate and battery reliability.
A coating surface density detection device was designed. By configuring the X-ray emitter to change the spot area, combined with the electron beam focusing mechanism and coil structure, differential detection of the main film area and the thinned area of the electrode sheet can be achieved.
It improves the measurement accuracy of coating surface density in the electrode thinning area, increases product qualification rate, and enhances battery reliability.
Smart Images
Figure CN224122504U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of coating surface density testing devices, and in particular to a coating surface density testing device for an electrode sheet. Background Technology
[0002] In related technologies, existing coating surface density detection devices include a radiation emitter and a radiation receiver, which are located on opposite sides of the electrode. The radiation emitter emits radiation that passes through the electrode and is detected by the radiation receiver, thereby detecting the coating surface density of the electrode.
[0003] The electrode comprises a first region and two second regions, arranged along the width of the electrode. The first region is located between the two second regions. The first region is the main film region of the electrode, and the second regions are the thinned areas of the electrode, located at the edge of the electrode along its width. However, existing X-ray emitters have relatively large light spots on the electrode, making it impossible to accurately measure the coating surface density at the thinned area. This easily leads to the thinned area becoming a blind spot for detection, preventing timely detection of surface density fluctuations, thus affecting detection accuracy, reducing product yield, and consequently impacting battery reliability. Utility Model Content
[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a coating surface density detection device, which is beneficial for improving detection accuracy, increasing product qualification rate, and consequently improving battery reliability.
[0005] The electrode coating density detection device according to the first aspect of the present invention includes:
[0006] A radiation emitter and a radiation receiver are provided, which are opposite to and spaced apart along a first direction to form a detection space between the radiation emitter and the radiation receiver for an electrode to pass through. The radiation emitter is used to emit radiation that can penetrate the electrode, and the radiation receiver is used to receive radiation emitted by the radiation emitter and passing through the electrode. The radiation emitter is configured to change the area of the spot formed on the electrode by the emitted radiation. The radiation emitter is reciprocating along the first direction to change the area of the spot formed on the electrode.
[0007] In the above technical solution, by configuring the X-ray emitter to change the area of the light spot formed on the electrode by the emitted X-ray, a larger light spot is used for detection in the main film area of the electrode, and a smaller light spot is used for detection in the thinned area of the electrode. This can improve the measurement accuracy of the coating surface density in the thinned area of the electrode, and help to capture the surface density fluctuations in the thinned area in a timely manner, thereby improving the detection accuracy, the product qualification rate, and the reliability of the battery. By allowing the X-ray emitter to reciprocate along the first direction, the size of the light spot formed on the electrode can be changed, making the method of changing the size of the light spot simple and convenient for the production and manufacturing of the coating surface density detection device.
[0008] In some embodiments, the radiation emitter includes a filament, an electron beam focusing mechanism, and a target, wherein an electron beam emanating from the filament bombards the target via the electron beam focusing mechanism to cause the radiation emitter to emit radiation, and the electron beam focusing mechanism is configured to selectively focus the electron beam as it flows through the electron beam focusing mechanism.
[0009] In the above technical solution, by setting an electron beam focusing mechanism, the area of the light spot formed on the electrode by the emitted rays can be changed. The size of the light spot area can be changed according to different positions of the electrode, which is beneficial to improving detection accuracy, improving product qualification rate, and thus improving the reliability of battery use.
[0010] In some embodiments, the electron beam focusing mechanism includes a coil structure located between the filament and the target.
[0011] In the above technical solution, by using an electron beam focusing mechanism including a coil structure and controlling the magnitude of the current flowing through the coil structure, the size of the light spot can be changed. This facilitates the structure of the electron beam focusing mechanism, is beneficial to its production and manufacturing, and thus helps to improve the production efficiency of the electron beam focusing mechanism.
[0012] In some embodiments, the coil structure forms a converging space through which an electron beam escaping from the filament flows to bombard the target.
[0013] In the above technical solution, a converging space is formed by the coil structure. After the coil structure is energized, it is beneficial to converge the electron beam, which is conducive to converging the electron beam on the target material, thereby making the coil structure set up reasonably.
[0014] In some embodiments, the coil structure includes a first coil that defines a convergence space.
[0015] In the above technical solution, by setting the coil structure as the first coil, it is more conducive to simplifying the structure of the electron beam focusing mechanism, more conducive to the production and manufacturing of the electron beam focusing mechanism, thus more conducive to improving the production efficiency of the electron beam focusing mechanism, and also conducive to reducing the manufacturing cost of the electron beam focusing mechanism.
[0016] In some embodiments, the coil structure includes a plurality of second coils that together enclose a convergence space.
[0017] In the above technical solution, by setting up multiple second coils, the multiple second coils can enclose a convergence space, thereby achieving the effect of arranging a convergence space.
[0018] In some embodiments, the ray emitter has multiple ray emitting sections, each of which is used to emit rays at an angle to a first direction toward the same position on the electrode, so that the rays emitted by the multiple ray emitting sections form multiple light spots on the electrode that overlap.
[0019] In the above technical solution, by using multiple ray emitting units to emit rays that form an angle with the first direction at the same position on the electrode, the rays emitted by the multiple ray emitting units can overlap the multiple light spots formed on the electrode, thereby allowing the rays emitted by the multiple ray emitting units to pass through the same position on the electrode, which is beneficial to improving the surface density detection accuracy.
[0020] In some embodiments, the distance the ray emitter moves along the first direction is greater than or equal to 1 mm and less than or equal to 100 mm.
[0021] In the above technical solution, by moving the X-ray emitter along the first direction by a distance greater than or equal to 1 mm and less than or equal to 100 mm, the position of the X-ray emitter relative to the X-ray receiver can be adjusted within a certain distance along the first direction. This allows different sizes of light spot areas to be formed on the electrode, enabling the coating density detection device to be adapted to the detection of more electrodes. This is beneficial to improving the versatility of the coating density detection device and also reduces the risk of the X-ray emitter colliding with the electrode while moving along the first direction.
[0022] In some embodiments, a plurality of ray emitting units are located on the side of the ray emitter facing the ray receiver, and the plurality of ray emitting units are arranged sequentially along the circumference of the ray emitter. From the direction of the ray emitter to the ray receiver, the ray emitting units extend obliquely toward the center of the ray emitter, so that the ray emitted by the plurality of ray emitting units forms multiple light spots on the electrode plate that overlap.
[0023] In the above technical solution, from the direction of the ray emitter to the ray receiver, the ray emitting part extends obliquely towards the middle of the ray emitter, thereby achieving the effect of multiple light spots formed on the electrode by the rays emitted by multiple ray emitting parts overlapping.
[0024] In some embodiments, the ray emitting part is movably disposed on the ray emitting device to change the angle between the ray emitted by the ray emitting part and the first direction.
[0025] In the above technical solution, the angle between the rays emitted by the ray emitting part and the first direction can be changed by movably distributing the ray emitting part on the ray emitter. At the same time, the size of the light spot formed on the electrode can be changed by moving the ray emitter along the first direction.
[0026] In some embodiments, the ray emitting part is rotatably disposed on the ray emitter so that the ray emitting part can rotate toward the center of the ray emitter or the outside of the ray emitter, and change the irradiation direction of the rays emitted by the ray emitting part.
[0027] In the above technical solution, the ray emitting part is rotatably disposed on the ray emitter. According to the actual use requirements, the ray emitting part can be rotated to the middle of the ray emitter or to the outside of the ray emitter, thereby adjusting the ray emitting part to an appropriate position, and thus changing the angle between the ray emitted by the ray emitting part and the first direction.
[0028] In some embodiments, the included angle between the ray emitting part and the reference plane perpendicular to the first direction is adjustable and is greater than or equal to 30° and less than or equal to 60°.
[0029] In the above technical solution, by setting the included angle between the ray emitting part and the reference plane to be adjustable and greater than or equal to 30° and less than or equal to 60°, the effect of excessive rotation adjustment of the ray emitting part is reduced while maintaining the overlap of multiple light spots formed on the electrode by the rays emitted by multiple ray emitting parts, thereby enabling the coating surface density detection device to meet the usage requirements.
[0030] In some embodiments, the radiation receiver is a strip structure, and the radiation receiver can be rotated to a first state and a second state about a rotation axis extending along a first direction. In the first state, the radiation receiver extends along a second direction, and in the second state, the radiation receiver extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The second direction is the length direction of the electrode, and the third direction is the width direction of the electrode.
[0031] In the above technical solution, by rotating the X-ray receiver around the rotation axis to the first state and the second state, when the X-ray emitter and the X-ray receiver are opposite to the main film area of the electrode in the first direction, the X-ray receiver rotates to the second state, thereby achieving a precise detection effect on the surface density of the main film area of the electrode. When the X-ray emitter and the X-ray receiver are opposite to the thinned area of the electrode in the first direction, the X-ray receiver rotates to the first state, controlling the effective spot area received by the X-ray emitter, thereby indirectly controlling the size of the test area of the electrode, achieving a precise detection effect on the surface density of the thinned area of the electrode, which can further improve the measurement accuracy of the coating surface density at the thinned area of the electrode, and is more conducive to timely capture of surface density fluctuations in the thinned area.
[0032] In some embodiments, the coating density detection device further includes a drive structure connected to the X-ray receiver and used to drive the X-ray receiver to rotate to a first state and a second state.
[0033] In the above technical solution, by setting a driving structure, the X-ray receiver can be driven to rotate to the first state and the second state, without the need for staff to manually drive the X-ray receiver to rotate to the first state and the second state, thus facilitating the adjustment of the position of the X-ray receiver.
[0034] In some embodiments, the radiation emitter and radiation receiver move synchronously along the width of the electrode.
[0035] In the above technical solution, by moving the X-ray emitter and the X-ray receiver synchronously along the width direction of the electrode, the X-ray emitter and the X-ray receiver can be kept relative to each other along the first direction, so that the X-ray receiver can receive the X-ray emitted by the X-ray emitter in real time, thereby maintaining the working reliability of the coating surface density detection device.
[0036] In some embodiments, the coating surface density detection device further includes: a detection mechanism, which is fixed to the X-ray receiver and can move synchronously with the X-ray receiver. The detection mechanism is used to detect a first region and a second region of the electrode sheet arranged along the width direction of the electrode sheet. The X-ray emitter is further configured to make the area of the light spot formed on the electrode sheet by the emitted X-rays a first area when the detection mechanism detects the first region, and the X-ray emitter is further configured to make the area of the light spot formed on the electrode sheet by the emitted X-rays a second area when the detection mechanism detects the second region, wherein the first area is larger than the second area.
[0037] In the above technical solution, by setting up a detection mechanism, the detection mechanism can accurately detect the first region and the second region. During the movement of the X-ray emitter and the X-ray receiver along the third direction, when the detection mechanism detects the first region, the X-ray emitter makes the area of the light spot formed on the electrode by the emitted X-ray the first area. When the detection mechanism detects the second region, the X-ray emitter makes the area of the light spot formed on the electrode by the emitted X-ray the second area. This can accurately match the size of the light spot area to the main film area and the thinning area of the electrode, which is more conducive to improving the detection accuracy.
[0038] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0039] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0040] Figure 1 This is a schematic diagram of the cooperation between the coating surface density detection device and the electrode sheet according to an embodiment of the present utility model;
[0041] Figure 2 This is a schematic diagram illustrating the cooperation of the filament, electron beam focusing mechanism, and target material according to an embodiment of the present invention;
[0042] Figure 3 This is a schematic diagram of the cooperation between the first coil and the target material according to an embodiment of the present utility model;
[0043] Figure 4 This is a schematic diagram showing how a convergence space is defined by the cooperation of multiple second coils according to an embodiment of the present invention;
[0044] Figure 5 This is a schematic diagram of the cooperation between the radiation receiver and the electrode plate according to an embodiment of the present utility model;
[0045] Figure 6 This is a schematic diagram showing the cooperation of the radiation emitter, electrode, radiation receiver, and drive structure according to an embodiment of the present utility model.
[0046] Figure 7 This is a schematic diagram of the radiation receiver in the second state according to an embodiment of the present invention;
[0047] Figure 8 This is a schematic diagram of the X-ray receiver in the first state according to an embodiment of the present invention.
[0048] Figure label:
[0049] Coating surface density testing device 100;
[0050] Ray emitter 10;
[0051] 11. Filament; 12. Electron beam focusing mechanism; 121. Coil structure; 122. Converging space; 123. First coil; 124. Second coil; 13. Target material;
[0052] Ray emitting section 14; Ray emitting end 15;
[0053] X-ray receiver 20;
[0054] Detection space 30;
[0055] Drive structure 40;
[0056] 50 testing institutions;
[0057] Mobile module 60; First frame 61; Second frame 62;
[0058] Electrode 200; First region 201; Second region 202. Detailed Implementation
[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0061] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0063] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0064] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0065] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.
[0066] In this application, "multiple" means two or more (including two).
[0067] The electrode mentioned in the embodiments of this application is applied inside a battery cell. The battery device may include multiple battery cells, which are connected in series, parallel or mixed connection through a busbar component.
[0068] In some embodiments, the battery device includes a housing and a plurality of battery cells housed within the housing.
[0069] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a mounting cavity inside the enclosure, which can accommodate multiple battery cells, i.e., multiple battery cells are installed in the mounting cavity. Here, "closed" refers to covering or closing, which can be sealed or not sealed. The first enclosure may be one of the upper enclosure and the lower enclosure, and the second enclosure may be the other of the upper enclosure and the lower enclosure.
[0070] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.
[0071] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.
[0072] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.
[0073] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode, a cathode electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the anode and cathode electrodes. The anode electrode includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The uncoated anode current collector protrudes beyond the coated anode current collector and serves as the anode tab. Taking a lithium-ion battery as an example, the anode current collector can be made of aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The cathode electrode includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The uncoated cathode current collector protrudes beyond the coated cathode current collector and serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple anode tabs stacked together, and there are multiple cathode tabs stacked together.
[0074] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.
[0075] In recent years, the vehicle industry has developed rapidly. Taking new energy vehicles as an example, the battery device, as a core component of the vehicle, plays an irreplaceable and important role.
[0076] In related technologies, a coating surface density detection device is used to detect the surface density of the electrode. Existing coating surface density detection devices include a radiation emitter and a radiation receiver, located on opposite sides of the electrode. The radiation emitter emits radiation that passes through the electrode and is detected by the radiation receiver, thus determining the coating surface density. The electrode includes a first region and two second regions, arranged along the width of the electrode. The first region is located between the two second regions. The first region is the main film region of the electrode, and the second regions are the thinned areas, located at the edges of the electrode along its width. However, existing radiation emitters have relatively large light spots on the electrode, making it difficult to accurately measure the coating surface density at the thinned areas. This easily leads to the thinned areas becoming detection blind spots, preventing timely detection of surface density fluctuations, thus affecting detection accuracy, reducing product yield, and consequently impacting battery reliability.
[0077] Based on the above considerations, to address the issue of accuracy in detecting the surface density of the thinned area, a coating surface density detection device for electrodes was designed after in-depth research. The device includes a radiation emitter and a radiation receiver, which are positioned opposite each other and spaced apart along a first direction to form a detection space between them for the electrode to pass through. The radiation emitter emits radiation that can penetrate the electrode, and the radiation receiver receives the radiation emitted by the emitter that has passed through the electrode. The radiation emitter is configured to vary the area of the light spot formed on the electrode by the emitted radiation. By configuring the radiation emitter to vary the area of the light spot formed on the electrode, a larger light spot is used for detection in the main film area of the electrode, while a smaller light spot is used for detection in the thinned area. This improves the accuracy of coating surface density measurement in the thinned area, facilitates the timely capture of surface density fluctuations in the thinned area, thereby improving detection accuracy, increasing product yield, and ultimately enhancing battery reliability.
[0078] The following is for reference. Figures 1-8 This invention describes a coating surface density detection device 100 for an electrode 200 according to an embodiment of the present invention.
[0079] like Figures 1-4As shown, the coating surface density detection device 100 for electrode 200 according to an embodiment of this application includes: a radiation emitter 10 and a radiation receiver 20. The radiation emitter 10 and the radiation receiver 20 are opposite to each other and spaced apart along a first direction to form a detection space 30 between the radiation emitter 10 and the radiation receiver 20 for the electrode 200 to pass through. The radiation emitter 10 is used to emit radiation that can penetrate the electrode 200 towards the electrode 200, and the radiation receiver 20 is used to receive the radiation emitted by the radiation emitter 10 and passing through the electrode 200. The radiation emitter 10 is configured to change the area of the light spot formed on the electrode 200 by the emitted radiation. The radiation emitter 10 is reciprocating along the first direction to change the area of the light spot formed on the electrode 200.
[0080] The coating surface density detection device 100 can perform real-time online detection. The coating surface density detection device 100 includes a radiation emitter 10 and a radiation receiver 20, which are arranged opposite to each other along a first direction and spaced apart along the first direction, thereby forming a detection space 30 between the radiation emitter 10 and the radiation receiver 20. Figure 1 As shown, the first direction is Figure 1 In the Z-direction, this application uses the vertical direction as an example. As one example, the ray emitter 10 is located above the ray receiver 20. As another example, the ray emitter 10 is located below the ray receiver 20. Figure 1 As shown, this application describes an example where the radiation emitter 10 is located above the radiation receiver 20. When the coating surface density detection device 100 detects the electrode 200, the electrode 200 is inserted into the detection space 30 along the belt travel direction (i.e., the length direction of the electrode 200). The electrode 200 is located between the radiation emitter 10 and the radiation receiver 20.
[0081] After the radiation emitter 10 emits radiation towards the electrode 200, a light spot is formed on the electrode 200. The radiation emitted by the radiation emitter 10 passes through the electrode 200 and is received by the radiation receiver 20, thereby achieving the effect of detecting the surface density of the electrode 200 by the coating surface density detection device 100. The radiation emitter 10 can be an X-ray emitter 10, or a beta-ray emitter 10. The type of radiation emitter 10 can be reasonably selected and set according to the actual use. The radiation emitter 10 can also emit other penetrating radiation.
[0082] The X-ray emitter 10 is configured to change the area of the light spot formed on the electrode 200 by the emitted X-ray. It should be noted that during the surface density detection of the electrode 200 by the coating surface density detection device 100, when the X-ray emitter 10 and the X-ray receiver 20 are opposite to the main film area of the electrode 200 along the first direction, the area of the light spot formed on the electrode 200 by the X-ray emitted by the X-ray emitter 10 is the first light spot area. When the X-ray emitter 10 and the X-ray receiver 20 are opposite to the thinned area of the electrode 200 along the first direction, the area of the light spot formed on the electrode 200 by the X-ray emitted by the X-ray emitter 10 is the second light spot area. The first light spot area is larger than the second light spot area.
[0083] For example, during the coating surface density detection process of the electrode 200 by the coating surface density detection device 100, the electrode 200 moves along the conveyor belt direction, and the X-ray emitter 10 and the X-ray receiver 20 move synchronously along the width direction of the electrode 200. When the X-ray emitter 10 and the X-ray receiver 20 are opposite to the main film area of the electrode 200 along the first direction, the X-ray emitted by the X-ray emitter 10 forms a spot on the electrode 200 with a larger first spot area to detect the surface density of the main film area of the electrode 200. When the X-ray emitter 10 and the X-ray receiver 20 are opposite to the thinned area of the electrode 200 along the first direction, the X-ray emitted by the X-ray emitter 10 forms a spot on the electrode 200 with a smaller second spot area to detect the surface density of the thinned area of the electrode 200.
[0084] In the process of detecting the surface density of the electrode 200 by the coating surface density detection device 100 of this application, the area of the light spot formed on the electrode 200 by the emitted rays from the X-ray emitter 10 is adjustable. A larger light spot is used for detection in the main film area of the electrode 200, and a smaller light spot is used for detection in the thinned area of the electrode 200. The light spot size is dynamically changed according to the different requirements of the main film area and the thinned area, thereby taking into account both the dynamic monitoring and detection efficiency of the thinned area. Furthermore, using a large light spot for detection in the main film area helps to maintain detection efficiency.
[0085] The X-ray emitter 10 can reciprocate along a first direction. The X-ray emitter 10 can move towards the X-ray receiver 20 along the first direction, and it can also move away from the X-ray receiver 20 along the first direction. During the surface density detection process of the coating surface density detection device 100 on the electrode 200, moving the X-ray emitter 10 towards the X-ray receiver 20 along the first direction reduces the distance between the X-ray emitter 10 and the electrode 200, thereby increasing the area of the light spot formed on the electrode 200. Moving the X-ray emitter 10 away from the X-ray receiver 20 along the first direction increases the distance between the X-ray emitter 10 and the electrode 200, thereby reducing the area of the light spot formed on the electrode 200.
[0086] As an example, the coating surface density detection device 100 may include a telescopic cylinder, and the X-ray emitter 10 is connected to the telescopic rod of the telescopic cylinder. The telescopic rod of the telescopic cylinder is telescopic along a first direction. The telescopic rod can drive the X-ray emitter 10 to move synchronously along the first direction, thereby achieving the effect of the X-ray emitter 10 being able to reciprocate along the first direction.
[0087] As another example, the coating surface density detection device 100 may include a threaded rod, on which a radiation emitter 10 may be sleeved. The threaded rod extends along a first direction, and the radiation emitter 10 and the threaded rod are threadedly connected. By rotating the threaded rod, the threaded rod can drive the radiation emitter 10 to move along the first direction, thereby achieving the effect of reciprocating movement of the radiation emitter 10 along the first direction.
[0088] As another example, the coating surface density detection device 100 may include a rack, a gear, and a drive motor. The rack extends along a first direction, and the ray emitter 10 is fixed to the rack. The output shaft of the drive motor is fixed with a gear. The gear and the rack mesh, and the drive motor drives the gear to rotate. The rotation of the gear drives the rack to move the ray emitter 10 synchronously along the first direction, thereby achieving the effect of reciprocating movement of the ray emitter 10 along the first direction.
[0089] The ray emitter 10 can be reciprocated along the first direction, thereby changing the size of the light spot formed on the electrode 200. This simplifies the method of changing the size of the light spot and facilitates the production and manufacturing of the coating density detection device 100.
[0090] In the above technical solution, by configuring the X-ray emitter 10 to change the area of the light spot formed on the electrode 200 by the emitted X-ray, a larger light spot is used for detection in the main film area of the electrode 200, and a smaller light spot is used for detection in the thinned area of the electrode 200. This can improve the measurement accuracy of the coating surface density in the thinned area of the electrode 200, and help to capture the surface density fluctuations in the thinned area in a timely manner, thereby improving the detection accuracy, improving the product qualification rate, and ultimately improving the reliability of the battery.
[0091] In some examples of this application, such as Figure 2 As shown, the radiation emitter 10 includes a filament 11, an electron beam focusing mechanism 12, and a target 13. An electron beam emanating from the filament 11 passes through the electron beam focusing mechanism 12 and bombards the target 13 to cause the radiation emitter 10 to emit radiation. The electron beam focusing mechanism 12 is configured to selectively focus the electron beam as it flows through the electron beam focusing mechanism 12.
[0092] The X-ray emitter 10 includes a filament 11, an electron beam focusing mechanism 12, and a target 13. After the electron beam escapes from the filament 11, it is accelerated by a high-voltage electric field to bombard the target 13, and then the target 13 emits X-rays. Therefore, the size of the X-ray spot is directly related to the size of the electron beam.
[0093] An electron beam focusing mechanism 12 can be installed between the filament 11 and the target material 13. The electron beam focusing mechanism 12 is positioned along the propagation path of the electron beam. When the ray emitter 10 and the ray receiver 20 are opposite to the main film region of the electrode 200 along a first direction, the electron beam focusing mechanism 12 does not converge the electron beam as it flows through it. This results in the ray emitted by the ray emitter 10 forming a larger first spot area on the electrode 200, thus increasing the spot size. When the ray emitter 10 and the ray receiver 20 are opposite to the thinned region of the electrode 200 along a first direction, the electron beam focusing mechanism 12 converges the electron beam as it flows through it. This results in the ray emitted by the ray emitter 10 forming a smaller second spot area on the electrode 200, thus reducing the spot size.
[0094] In the above technical solution, by setting the electron beam focusing mechanism 12, the area of the light spot formed on the electrode 200 by the emitted rays of the ray emitter 10 can be changed. The size of the light spot area can be changed according to different positions of the electrode 200, which is beneficial to improving detection accuracy, improving product qualification rate, and thus improving the reliability of battery use.
[0095] In some examples of this application, such as Figures 2-4 As shown, the electron beam focusing mechanism 12 includes a coil structure 121, which is located between the filament 11 and the target material 13.
[0096] The electron beam focusing mechanism 12 may include a coil structure 121 located between the filament 11 and the target material 13. When the radiation emitter 10 and the radiation receiver 20 are opposite to the main film region of the electrode 200 along a first direction, the coil structure 121 is not energized or carries a small current (i.e., less than or equal to 1A). When the electron beam flows through the electron beam focusing mechanism 12, the electron beam focusing mechanism 12 does not focus the electron beam, thereby making the area of the light spot formed on the electrode 200 by the radiation emitted by the radiation emitter 10 a larger first light spot area. When the radiation emitter 10 and the radiation receiver 20 are opposite to the thinned region of the electrode 200 along the first direction, the coil structure 121 is energized and carries a large current (exemplarily 10A-75A), forming a magnetic field. When the electron beam flows through the magnetic field, it is subjected to the Lorentz force and undergoes spiral motion, causing the electron beam to focus on the target material 13, thereby achieving the effect of reducing the light spot area.
[0097] In the above technical solution, by controlling the magnitude of the current flowing through the coil structure 121 of the electron beam focusing mechanism 12, the size of the light spot area can be changed. This simplifies the structure of the electron beam focusing mechanism 12, facilitates its production and manufacturing, and thus improves its production efficiency.
[0098] In some examples of this application, such as Figure 3 and Figure 4 As shown, the coil structure 121 forms a converging space 122, through which the electron beam escaping from the filament 11 flows to bombard the target material 13.
[0099] The coil structure 121 forms a converging space 122. In other words, the coil structure 121 defines the converging space 122, which can penetrate the coil structure 121 along the arrangement direction of the filament 11 and the target material 13. When the radiation emitter 10 and the radiation receiver 20 are opposite to the main film region of the electrode 200 along the first direction, the coil structure 121 is not energized or is energized with a small current (i.e., less than or equal to 1A). When the electron beam flows through the converging space 122, the coil structure 121 does not converge the electron beam, thereby making the area of the light spot formed on the electrode 200 by the radiation emitted by the radiation emitter 10 a larger first light spot area. When the X-ray emitter 10 and the X-ray receiver 20 are opposite to the thinned area of the electrode 200 along the first direction, the coil structure 121 is energized and carries a large current (exemplarily, a current of 10A-75A, the current can be 40A), forming a magnetic field. When the electron beam flows through the converging space 122, the electron beam will be subjected to the Lorentz force and undergo spiral motion when flowing through the magnetic field, so that the electron beam is focused on the target material 13, thereby achieving the effect of reducing the area of the light spot.
[0100] In the above technical solution, a converging space 122 is formed by the coil structure 121. After the coil structure 121 is energized, it is beneficial to converge the electron beam, thereby making the electron beam converge on the target material 13, and thus making the coil structure 121 reasonably set.
[0101] In some examples of this application, such as Figure 3 As shown, the coil structure 121 includes a first coil 123, which defines a convergence space 122.
[0102] The coil structure 121 may include a first coil 123, which is a single coil that defines a convergence space 122. The first coil 123 may be a spiral structure, thereby defining the convergence space 122. For example, the number of turns of the first coil 123 may be set to 50 turns.
[0103] In the above technical solution, by setting the coil structure 121 as the first coil 123, it is more conducive to simplifying the structure of the electron beam focusing mechanism 12, more conducive to the production and manufacturing of the electron beam focusing mechanism 12, thereby more conducive to improving the production efficiency of the electron beam focusing mechanism 12, and also conducive to reducing the manufacturing cost of the electron beam focusing mechanism 12.
[0104] In some examples of this application, such as Figure 4 As shown, the coil structure 121 includes a plurality of second coils 124, which together enclose a convergence space 122.
[0105] The coil structure 121 may include multiple second coils 124. The number of second coils 124 can be two, three, four, five, etc., and the number can be reasonably selected according to actual conditions. This application uses four second coils 124 as an example for illustration. Figure 4 As shown, multiple second coils 124 together enclose a convergence space 122.
[0106] In the above technical solution, by setting multiple second coils 124, the multiple second coils 124 can enclose a convergence space 122, thereby achieving the effect of arranging the convergence space 122.
[0107] In some examples of this application, such as Figure 5 As shown, the ray emitter 10 has multiple ray emitting sections 14, each of which is used to emit rays at the same position on the electrode 200 at an angle to the first direction, so that the rays emitted by the multiple ray emitting sections 14 form multiple light spots on the electrode 200 that overlap.
[0108] The ray emitter 10 has multiple ray emitting sections 14. Along a first direction, the end of each ray emitting section 14 facing the ray receiver 20 is a ray emitting end 15. Each ray emitting section 14 may include a ray emitting tube, which emits rays to the electrode 200 through the ray emitting end 15. The multiple ray emitting sections 14 are all used to emit rays to the same position on the electrode 200. The rays emitted by each ray emitting section 14 form an angle with the first direction, that is, the rays emitted by each ray emitting section 14 are not parallel to the first direction, so that the multiple light spots formed on the electrode 200 by the rays emitted by the multiple ray emitting sections 14 can overlap. As an example, the rays emitted by the multiple ray emitting units 14 form light spots with the same area on the electrode 200, and the light spots formed by the multiple ray emitting units 14 on the electrode 200 have the same shape. When the coating surface density detection device 100 detects the surface density of the electrode 200, the multiple ray emitting units 14 emit rays to the same position on the electrode 200 so that the multiple light spots formed by the multiple ray emitting units 14 on the electrode 200 completely overlap.
[0109] As another example, the rays emitted by multiple ray emitting units 14 form light spots with the same area on the electrode 200, and the light spots formed by the rays emitted by multiple ray emitting units 14 on the electrode 200 have the same shape. When the coating surface density detection device 100 detects the surface density of the electrode 200, the multiple ray emitting units 14 emit rays to the same position on the electrode 200, and the multiple light spots formed by the multiple ray emitting units 14 on the electrode 200 do not completely overlap, and at least two light spots have non-overlapping areas.
[0110] In the above technical solution, by having multiple ray emitting units 14 emit rays at the same position of the electrode 200 that form an angle with the first direction, the rays emitted by the multiple ray emitting units 14 can overlap the multiple light spots formed on the electrode 200, thereby allowing the rays emitted by the multiple ray emitting units 14 to pass through the same position of the electrode 200, which is beneficial to improving the surface density detection accuracy.
[0111] In some examples of this application, such as Figure 5 As shown, the distance the ray emitter 10 moves along the first direction is greater than or equal to 1 mm and less than or equal to 100 mm.
[0112] The range of the moving distance of the ray emitter 10 along the first direction is H. In other words, the range of the adjustable distance of the ray emitter 10 along the first direction is H, which satisfies the relationship: 1mm≤H≤100mm. H can be a value such as 1mm, 10mm, 15mm, 20mm, 25mm, 40mm, 50mm, 70mm, 80mm, 90mm, 95mm, 98mm, 100mm, etc.
[0113] In the above technical solution, by moving the X-ray emitter 10 along the first direction by a distance greater than or equal to 1 mm and less than or equal to 100 mm, the position of the X-ray emitter 10 relative to the X-ray receiver 20 can be adjusted within a certain distance along the first direction. This allows different sizes of light spot areas to be formed on the electrode 200, enabling the coating surface density detection device 100 to be adapted to the detection of more electrodes 200. This is beneficial to improving the versatility of the coating surface density detection device 100 and also reduces the risk of the X-ray emitter 10 colliding with the electrode 200 while moving along the first direction.
[0114] In some examples of this application, such as Figure 5 As shown, multiple ray emitting units 14 are located on the side of the ray emitter 10 facing the ray receiver 20, and the multiple ray emitting units 14 are arranged sequentially along the circumference of the ray emitter 10. From the ray emitter 10 to the ray receiver 20, the ray emitting units 14 extend obliquely towards the center of the ray emitter 10 so that the multiple light spots formed on the electrode 200 by the rays emitted by the multiple ray emitting units 14 overlap.
[0115] In this configuration, along the first direction, a plurality of ray emitting units 14 are located on the side of the ray emitter 10 facing the ray receiver 20, and the plurality of ray emitting units 14 are arranged sequentially along the circumference of the ray emitter 10; in other words, the plurality of ray emitting units 14 are arranged around the first direction. Along the first direction, from the ray emitter 10 to the ray receiver 20, each ray emitting unit 14 extends obliquely toward the center of the ray emitter 10, thereby allowing the rays emitted by the plurality of ray emitting units 14 to form multiple light spots on the electrode 200 to overlap.
[0116] In the above technical solution, from the direction of the ray emitter 10 to the ray receiver 20, the ray emitting part 14 extends obliquely towards the middle of the ray emitter 10, thereby achieving the effect that the rays emitted by the multiple ray emitting parts 14 form multiple light spots on the electrode 200.
[0117] In some examples of this application, such as Figure 5 As shown, the ray emitting part 14 is movably disposed on the ray emitting unit 10 to change the angle between the ray emitted by the ray emitting part 14 and the first direction.
[0118] As one example, the ray emitting unit 14 can be mounted to the ray emitting unit 10 via a universal joint, thereby movably disposed on the ray emitting unit 14. As another example, the ray emitting unit 14 can be rotatably mounted to the ray emitting unit 10 via a pivot shaft, thereby movably disposed on the ray emitting unit 10. By moving the ray emitting unit 14, the angle between the ray emitted by the ray emitting unit 14 and the first direction can be changed. Simultaneously, by moving the ray emitting unit 10 along the first direction, the size of the light spot area formed on the electrode 200 can be changed.
[0119] In the above technical solution, the ray emitting part 14 is movably disposed on the ray emitting device 10, which can change the angle between the ray emitted by the ray emitting part 14 and the first direction. At the same time, by moving the ray emitting device 10 along the first direction, the size of the light spot area formed on the electrode 200 can be changed.
[0120] In some examples of this application, such as Figure 5 As shown, the ray emitting part 14 is rotatably disposed on the ray emitting device 10 so that the ray emitting part 14 can rotate toward the middle of the ray emitting device 10 or the outside of the ray emitting device 10, and change the irradiation direction of the rays emitted by the ray emitting part 14.
[0121] The ray emitting unit 14 is rotatably mounted on the ray emitter 10 via a pivot axis. Each ray emitting unit 14 can be provided with a corresponding pivot axis, and the central axis of the pivot axis is perpendicular to the first direction. During the rotation of the ray emitting unit 14, the ray emitting unit 14 can rotate towards the center of the ray emitter 10, or it can rotate towards the outside of the ray emitter 10. Depending on the actual needs, the ray emitting unit 14 can be selected to rotate towards the center or the outside of the ray emitter 10.
[0122] In the above technical solution, the ray emitting part 14 is rotatably disposed on the ray emitting device 10. According to the actual use requirements, the ray emitting part 14 can be rotated to the middle of the ray emitting device 10 or to the outside of the ray emitting device 10, thereby adjusting the ray emitting part 14 to an appropriate position, and thus changing the angle between the ray emitted by the ray emitting part 14 and the first direction.
[0123] In some examples of this application, such as Figure 5 As shown, the included angle between the ray emitting part 14 and the reference plane perpendicular to the first direction is adjustable and is greater than or equal to 30° and less than or equal to 60°.
[0124] The reference plane is a plane and is perpendicular to the first direction. When the first direction is vertical, the reference plane is horizontal. The angle between the ray emitting unit 14 and the reference plane is adjustable. The angle between the ray emitting unit 14 and the reference plane can be adjusted between 30° and 60°. The angle between the ray emitting unit 14 and the reference plane can be adjusted to values such as 30°, 45°, and 60°. The minimum angle between the ray emitting unit 14 and the reference plane is 30°, and the maximum angle is 60°.
[0125] In the above technical solution, by setting the included angle between the ray emitting part 14 and the reference plane to be adjustable and greater than or equal to 30° and less than or equal to 60°, the effect of excessive rotation adjustment of the ray emitting part 14 is reduced while maintaining the overlap of multiple light spots formed on the electrode 200 by the rays emitted by multiple ray emitting parts 14, thereby enabling the coating surface density detection device 100 to meet the usage requirements.
[0126] In some examples of this application, such as Figures 6-8 As shown, the X-ray receiver 20 has a strip-shaped structure. The X-ray receiver 20 can be rotated to a first state and a second state around a rotation axis extending along a first direction. In the first state, the X-ray receiver 20 extends along a second direction. In the second state, the X-ray receiver 20 extends along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The second direction is the length direction of the electrode 200, and the third direction is the width direction of the electrode 200.
[0127] The radiation receiver 20 has a strip-shaped structure, which can be rectangular or elliptical. This application uses a rectangular structure as an example. For instance, the length of the radiation receiver 20 is L1 mm, the width is L2 mm, and 1.5 ≤ L1 / L2 ≤ 5. The ratio of L1 / L2 can be 1.5, 2.5, 3, 3.5, 4.5, 4.9, 5, etc.
[0128] The radiation receiver 20 is rotatable about a rotation axis extending in a first direction to a first state and a second state. In the first state, the radiation receiver 20 extends along the length direction of the electrode 200; in the second state, the radiation receiver 20 extends along the width direction of the electrode 200. Figure 7 As shown, the second direction is Figure 7 In the Y direction, the third direction is Figure 7 The M direction in the middle.
[0129] When the X-ray emitter 10 and the X-ray receiver 20 are opposite the main film region of the electrode 200 along the first direction, the X-ray receiver 20 rotates to a second state, extending along the width direction of the electrode 200, thereby achieving accurate detection of the areal density of the main film region of the electrode 200. When the X-ray emitter 10 and the X-ray receiver 20 are opposite the thinned region of the electrode 200 along the first direction, the X-ray receiver 20 rotates to the first state, controlling the effective spot area received by the X-ray emitter 10, thereby indirectly controlling the size of the test area of the electrode 200, thus achieving accurate detection of the areal density of the thinned region of the electrode 200.
[0130] In the above technical solution, by rotating the X-ray receiver 20 around the rotation axis to the first state and the second state, when the X-ray emitter 10 and the X-ray receiver 20 are opposite to the main film area of the electrode 200 along the first direction, the X-ray receiver 20 rotates to the second state, thereby achieving a precise detection effect on the surface density of the main film area of the electrode 200. When the X-ray emitter 10 and the X-ray receiver 20 are opposite to the thinned area of the electrode 200 along the first direction, the X-ray receiver 20 rotates to the first state, controlling the effective spot area received by the X-ray emitter 10, thereby indirectly controlling the size of the test area of the electrode 200, achieving a precise detection effect on the surface density of the thinned area of the electrode 200, which can further improve the measurement accuracy of the coating surface density at the thinned area of the electrode 200, and is more conducive to timely capture of surface density fluctuations in the thinned area.
[0131] In some examples of this application, such as Figure 6 As shown, the coating surface density detection device 100 further includes a drive structure 40, which is connected to the X-ray receiver 20 and is used to drive the X-ray receiver 20 to rotate to a first state and a second state.
[0132] The coating surface density detection device 100 may further include a drive structure 40, which is connected to the radiation receiver 20. The drive structure 40 can drive the radiation receiver 20 to rotate around a rotation axis, thereby driving the radiation receiver 20 to rotate to a first state and a second state. The drive structure 40 may be located on the side of the radiation receiver 20 away from the radiation emitter 10. As an example, the drive structure 40 may be a first motor, with its output shaft extending along a first direction. The output shaft of the first motor is fixedly connected to the radiation receiver 20, and when the first motor is working, its output shaft drives the radiation receiver 20 to rotate to the first state and the second state. As another example, the drive structure 40 may include a fixed shaft, a first gear, a second gear, and a second motor. The fixed shaft extends along the first direction, the radiation receiver 20 is fixed to the fixed shaft, the first gear and the second gear mesh, the first gear is fixed to the fixed shaft, and the second gear is fixed to the output shaft of the second motor when it is working. When the second motor is working, it drives the radiation receiver 20 to rotate to the first state and the second state through the second gear, the first gear, and the fixed shaft.
[0133] In the above technical solution, by setting the driving structure 40, the X-ray receiver 20 can be driven to rotate to the first state and the second state, without the need for the operator to manually drive the X-ray receiver 20 to rotate to the first state and the second state, thus facilitating the adjustment of the position of the X-ray receiver 20.
[0134] In some examples of this application, such as Figure 6 As shown, the radiation emitter 10 and radiation receiver 20 move synchronously along the width direction of the electrode 200.
[0135] The electrode 200 has its width direction as the third direction, and the X-ray emitter 10 and X-ray receiver 20 are along the third direction. The coating surface density detection device 100 may further include a moving module 60. For example, the moving module 60 may be a moving frame, which may include a first frame 61 and a second frame 62. The first frame 61 and the second frame 62 are opposite to each other and spaced apart along the first direction. The X-ray emitter 10 is fixed to the first frame 61, and the X-ray receiver 20 is fixed to the second frame 62. Both the X-ray emitter 10 and the X-ray receiver 20 are detachably mounted on the moving module 60. The moving module 60 can reciprocate along the width direction of the electrode 200. During the movement of the moving module 60, the X-ray emitter 10 and the X-ray receiver 20 move synchronously along the width direction of the electrode 200, thereby enabling the coating surface density detection device 100 to detect the surface density at different positions of the electrode 200. The coating surface density detection device 100 may further include: a drive module, which may be a linear drive motor or a telescopic cylinder. The drive module is connected to the moving module 60 to drive the moving module 60 to move along the width direction of the electrode 200.
[0136] In the above technical solution, by moving the X-ray emitter 10 and the X-ray receiver 20 synchronously along the width direction of the electrode 200, the X-ray emitter 10 and the X-ray receiver 20 can be kept relative to each other along the first direction, so that the X-ray receiver 20 can receive the X-ray emitted by the X-ray emitter 10 in real time, thereby maintaining the working reliability of the coating surface density detection device 100.
[0137] In some examples of this application, such as Figure 1 As shown, the coating surface density detection device 100 further includes: a detection mechanism 50, which is fixed to the X-ray receiver 20 and can move synchronously with the X-ray receiver 20. The detection mechanism 50 is used to detect the first region 201 and the second region 202 of the electrode 200 arranged along the width direction of the electrode 200. The X-ray emitter 10 is also configured to make the area of the light spot formed on the electrode 200 by the emitted X-rays a first area when the detection mechanism 50 detects the first region 201, and the X-ray emitter 10 is also configured to make the area of the light spot formed on the electrode 200 by the emitted X-rays a second area when the detection mechanism 50 detects the second region 202. The first area is larger than the second area.
[0138] The detection mechanism 50 can be a position sensor, such as a photoelectric sensor, color sensor, ultrasonic sensor, or laser sensor. The detection mechanism 50 and the X-ray receiver 20 can be arranged along a third direction, adjacent to each other. The detection mechanism 50 is fixed to the X-ray receiver 20, either by snap-fit or by bolts. When the X-ray receiver 20 moves along the third direction, it causes the position sensor to move synchronously. The electrode 200 has a first region 201 and a second region 202. The first region 201 is the main film region in the above embodiment, and the second region 202 is the thinning region in the above embodiment. The detection mechanism 50 is used to detect the first region 201 and the second region 202 of the electrode 200. When the detection mechanism 50 detects the first region 201, the X-ray emitter 10 is opposite to the main film region, and the X-ray emitter 10 makes the area of the light spot formed on the electrode 200 by the emitted X-rays the first area (i.e., large light spot). When the detection mechanism 50 detects the second region 202, the X-ray emitter 10 makes the area of the light spot formed on the electrode 200 by the emitted X-rays the second area (i.e., small light spot).
[0139] In the above technical solution, by setting up a detection mechanism 50, the detection mechanism 50 can accurately detect the first region 201 and the second region 202. During the movement of the X-ray emitter 10 and the X-ray receiver 20 along the third direction, when the detection mechanism 50 detects the first region 201, the X-ray emitter makes the area of the light spot formed on the electrode 200 by the emitted X-ray the first area. When the detection mechanism 50 detects the second region 202, the X-ray emitter 10 makes the area of the light spot formed on the electrode 200 by the emitted X-ray the second area. This can accurately match the size of the light spot area between the main film area and the thinning area of the electrode 200, which is more conducive to improving the detection accuracy.
[0140] According to some embodiments of this application, see Figures 1-3 As shown, this application provides a coating surface density detection device 100, including: a radiation emitter 10 and a radiation receiver 20. The radiation emitter 10 and the radiation receiver 20 are opposite to each other and spaced apart along a first direction to form a detection space 30 between the radiation emitter 10 and the radiation receiver 20 for an electrode 200 to pass through. The radiation emitter 10 is used to emit radiation that can penetrate the electrode 200 towards the electrode 200, and the radiation receiver 20 is used to receive the radiation emitted by the radiation emitter 10 that passes through the electrode 200. The radiation emitter 10 is configured to change the spot area formed on the electrode 200 by the emitted radiation. The radiation emitter 10 includes a filament 11, an electron beam focusing mechanism 12, and a target material 13. The electron beam emanating from the filament 11 bombards the target material 13 through the electron beam focusing mechanism 12 to cause the radiation emitter 10 to emit radiation. The electron beam focusing mechanism 12 is configured to selectively focus the electron beam as it flows through the electron beam focusing mechanism 12. The electron beam focusing mechanism 12 includes a coil structure 121 located between the filament 11 and the target material 13. The coil structure 121 includes a first coil 123 defining a focusing space 122. The radiation receiver 20 is a strip-shaped structure rotatable about a rotation axis extending in a first direction to a first state and a second state. In the first state, the radiation receiver 20 extends in a second direction; in the second state, the radiation receiver 20 extends in a third direction. The coating surface density detection device 100 also includes a drive structure 40 connected to the radiation receiver 20 and used to drive the radiation receiver 20 to rotate to the first and second states. The radiation emitter 10 and the radiation receiver 20 move synchronously along the width direction of the electrode 200.
[0141] The coating surface density detection device 100 further includes: a detection mechanism 50, which is fixed to the X-ray receiver 20 and can move synchronously with the X-ray receiver 20; the X-ray emitter 10 is further configured such that when the detection mechanism 50 detects the first region 201, the area of the light spot formed by the emitted X-ray on the electrode 200 is a first area; and the X-ray emitter 10 is further configured such that when the detection mechanism 50 detects the second region 202, the area of the light spot formed by the emitted X-ray on the electrode 200 is a second area, wherein the first area is larger than the second area.
[0142] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0143] Other configurations and working principles of the radiation emitter 10 and radiation receiver 20 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.
[0144] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0145] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A coated-face density detection device for an electrode tab, characterized by, include: A ray emitter and a ray receiver are positioned opposite each other and spaced apart along a first direction to form a detection space between the ray emitter and the ray receiver for an electrode to pass through. The ray emitter is used to emit rays that can penetrate the electrode, and the ray receiver is used to receive rays emitted by the ray emitter that pass through the electrode. The ray emitter is configured to change the area of the spot formed on the electrode by the emitted rays. The ray emitter can reciprocate along the first direction to change the area of the light spot formed on the electrode.
2. The coated-face density detecting apparatus for a pole piece according to claim 1, wherein The radiation emitter includes a filament, an electron beam focusing mechanism, and a target. An electron beam emanating from the filament passes through the electron beam focusing mechanism and bombards the target to cause the radiation emitter to emit radiation. The electron beam focusing mechanism is configured to selectively focus the electron beam as it flows through the electron beam focusing mechanism.
3. The electrode coating density detection device according to claim 2, characterized in that, The electron beam focusing mechanism includes a coil structure located between the filament and the target.
4. The electrode coating density detection device according to claim 3, characterized in that, The coil structure forms a converging space, through which an electron beam escaping from the filament flows to bombard the target material.
5. The electrode coating density detection device according to claim 4, characterized in that, The coil structure includes a first coil that defines the convergence space.
6. The electrode coating density detection device according to claim 4, characterized in that, The coil structure includes multiple second coils, which together enclose the convergence space.
7. The electrode coating density detection device according to claim 1, characterized in that, The ray emitter has multiple ray emitting sections, each of which is used to emit rays at an angle to the first direction toward the same position on the electrode, so that the multiple light spots formed on the electrode by the rays emitted by the multiple ray emitting sections overlap.
8. The electrode coating density detection device according to claim 1, characterized in that, The distance the ray emitter moves along the first direction is greater than or equal to 1 mm and less than or equal to 100 mm.
9. The electrode coating density detection device according to claim 7, characterized in that, Multiple ray emitting units are located on the side of the ray emitter facing the ray receiver, and the multiple ray emitting units are arranged sequentially along the circumference of the ray emitter. From the direction of the ray emitter to the ray receiver, the ray emitting units extend obliquely toward the center of the ray emitter, so that the multiple light spots formed on the electrode by the rays emitted by the multiple ray emitting units overlap.
10. The electrode coating density detection device according to claim 9, characterized in that, The ray emitting part is movably disposed on the ray emitter to change the angle between the ray emitted by the ray emitting part and the first direction.
11. The electrode coating density detection device according to claim 10, characterized in that, The ray emitting part is rotatably disposed on the ray emitter, so that the ray emitting part can rotate toward the middle of the ray emitter or the outside of the ray emitter, and change the irradiation direction of the rays emitted by the ray emitting part.
12. The electrode coating density detection device according to claim 11, characterized in that, The angle formed between the ray emitting part and the reference plane perpendicular to the first direction is adjustable and is greater than or equal to 30° and less than or equal to 60°.
13. The electrode coating density detection device according to claim 1, characterized in that, The radiation receiver is a strip structure. The radiation receiver can be rotated to a first state and a second state around a rotation axis extending along the first direction. In the first state, the radiation receiver extends along the second direction. In the second state, the radiation receiver extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The second direction is the length direction of the electrode, and the third direction is the width direction of the electrode.
14. The electrode coating density detection device according to claim 13, characterized in that, The coating surface density detection device further includes a driving structure, which is connected to the X-ray receiver and is used to drive the X-ray receiver to rotate to the first state and the second state.
15. The electrode coating density detection device according to any one of claims 1-14, characterized in that, The ray emitter and the ray receiver move synchronously along the width of the electrode.
16. The electrode coating density detection device according to claim 15, characterized in that, The coating surface density detection device further includes: a detection mechanism, which is fixed to the X-ray receiver and can move synchronously with the X-ray receiver. The detection mechanism is used to detect a first region and a second region of the electrode sheet arranged along the width direction of the electrode sheet. The X-ray emitter is further configured to make the area of the light spot formed by the emitted X-ray on the electrode sheet a first area when the detection mechanism detects the first region, and the X-ray emitter is further configured to make the area of the light spot formed by the emitted X-ray on the electrode sheet a second area when the detection mechanism detects the second region, wherein the first area is larger than the second area.