Areal Density Equipment Calibration Device and Areal Density Equipment Calibration Method

Abstract

An embodiment of the present application provides a surface density device calibration apparatus and a surface density device calibration method, which relate to the field of battery detection devices. The surface density device calibration apparatus is used to calibrate a surface density detection device, and the surface density device calibration apparatus includes a mounting frame, a standard part, and an adjusting part. The mounting frame is used to be mounted on the surface density device. The standard part includes a plurality of standard areas with different densities. The adjusting part is connected to the standard part and the mounting frame, and the adjusting part is configured to adjust the positions of the plurality of standard areas so that the plurality of standard areas are successively moved to the detection station of the surface density device. By using the standard part to calibrate the surface density device instead of the pole piece, the time consumed for manufacturing the pole piece is saved, and the efficiency of calibrating the surface density device is improved.

Description

Technical Field

[0001] This application relates to the field of battery detection equipment, and particularly to a surface density equipment calibration device and a surface density equipment calibration method. Background Art

[0002] The electrode sheet is an important component of the battery, and the coating effect of the electrode sheet directly affects the performance of the battery. Therefore, it is necessary to detect the coating effect of the electrode sheet.

[0003] The detection of the coating effect of the electrode sheet is usually completed by a surface density equipment. The surface density equipment needs to be calibrated before use. The traditional operation process is to use a standard electrode sheet for calibration. The production time of the standard electrode sheet is long, resulting in low calibration efficiency. Therefore, improving the calibration efficiency of the surface density equipment is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The purpose of this application is to provide a surface density equipment calibration device and a surface density equipment calibration method, and the surface density equipment calibration device can improve the calibration efficiency of the surface density equipment.

[0005] On the one hand, an embodiment of this application provides a surface density equipment calibration device for calibrating a surface density detection equipment. The surface density equipment calibration device includes a mounting frame, a standard component, and an adjusting component. The mounting frame is used to be mounted on the surface density equipment. The standard component includes a plurality of standard areas with different densities. The adjusting component is connected to the standard component and the mounting frame, and the adjusting component is configured to adjust the positions of the plurality of standard areas so that the plurality of standard areas are successively moved to the detection station of the surface density equipment.

[0006] In the above solution, by adjusting each standard component through the adjusting component, the standard area in the measurement station of the surface density equipment can be replaced, so as to measure the surface density measurement values of the plurality of standard areas. Then, by performing linear regression on the surface density measurement values of the standard areas and the corresponding surface density values of the standard areas, the calibration process of the surface density equipment can be completed. By using the standard component to replace the electrode sheet to calibrate the surface density equipment, the electrode sheet manufacturing link is omitted, thus saving the time required for calibration and improving the calibration efficiency.

[0007] In some embodiments, the standard component is rotatably arranged on the mounting frame, and the plurality of standard areas are arranged around the rotation center of the standard component. The adjusting component is configured to drive the standard component to rotate relative to the mounting frame to adjust the positions of the plurality of standard areas.

[0008] In the above solution, the adjusting component drives the standard component to rotate relative to the mounting bracket to switch the standard area at the detection station of the areal density device, meeting the calibration requirements of the areal density device. During the switching process, the standard component only rotates relative to the mounting bracket, and the connection position between the standard component and the mounting bracket does not change, facilitating the control of the position of the standard area and reducing the risk that the rays of the areal density device cannot irradiate the standard area due to a positional deviation of the standard area.

[0009] In some embodiments, in the embodiment where the standard component is rotatably arranged on the mounting bracket, multiple standard areas are integrally formed.

[0010] In the above solution, the multiple standard areas are integrally formed. On the one hand, the structural strength of the standard component is improved, and the service life of the standard component is extended. On the other hand, the relative positions between the standard areas are fixed, reducing the risk that the areal density device cannot accurately measure the areal density of the standard area due to an offset of the standard area during the calibration of the areal density device.

[0011] In some embodiments, the mounting bracket further includes a mounting disk, and multiple standard areas are arranged around the outer side of the mounting disk, and the mounting disk is connected to the adjusting component.

[0012] In the above solution, the standard area is connected to the adjusting component through the mounting disk. On the one hand, it is convenient to install and fix the standard area. On the other hand, when driving the standard area to rotate, the torque generated by the adjusting component acts on the mounting disk and does not directly act on the standard area, reducing the risk that the standard area is deformed due to force.

[0013] In some embodiments, the standard area and the mounting disk are integrally formed.

[0014] In the above solution, by integrally forming the standard area and the mounting disk, the connection strength between the standard area and the mounting disk is increased, reducing the risk that the standard area moves relative to the mounting disk.

[0015] In some embodiments, multiple standard areas are continuously arranged along the circumferential direction of the mounting disk.

[0016] In the above solution, the standard areas are continuously arranged along the circumferential direction of the mounting disk. On the one hand, the area through which the rays can pass through the standard areas is increased, reducing the risk that the rays of the areal density device cannot irradiate the standard area due to the too small area of the standard area. On the other hand, when the mounting disk rotates, each standard area can pass through the measurement station of the areal density device in sequence, eliminating the need for manual replacement of the standard film and improving the calibration efficiency.

[0017] In some embodiments, one of the multiple standard areas is provided with a hollowed-out portion.

[0018] In the above solution, by providing the hollowed-out portion in the standard area, the calibration process of the areal density device can be completed without disassembling the standard component, improving the calibration efficiency.

[0019] In some embodiments, the standard member further includes a mounting disk, the mounting disk is connected to the mounting rack, the mounting disk is provided with a plurality of through holes arranged at intervals along the circumferential direction of the mounting disk, the standard area is mounted on the mounting disk, one standard area covers one through hole, and the mounting disk is connected to an adjusting member.

[0020] In the above solution, the mounting disk plays a role in supporting and fixing the standard area, so that the standard area in the embodiments of the present application can be made of either a hard material or a soft material, improving the applicable range of the standard area.

[0021] In some embodiments, the mounting disk is provided with a locking mechanism, and the locking mechanism is configured to lock the standard area to the mounting disk.

[0022] In the above solution, the standard area is locked to the mounting disk through the locking mechanism, reducing the risk of the standard area moving relative to the mounting disk and improving the reliability of the standard member.

[0023] In some embodiments, the locking mechanism includes a pressing ring and a connecting member, the pressing ring, the standard area and the mounting disk are stacked, the standard area is located between the pressing ring and the mounting disk, and the connecting member connects the pressing ring and the mounting disk.

[0024] In the above solution, the connecting member enables the pressing ring to tightly press on the standard area, so that the standard area can be fixed to the mounting disk, reducing the risk of the standard area becoming loose and improving the reliability of the standard member. Moreover, if the standard area is made of a soft material, the pressing ring can keep the standard area in a straight state, reducing the risk of measurement errors caused by wrinkles in the standard area.

[0025] In some embodiments, the mounting disk is provided with a hollow portion, and along the circumferential direction of the mounting disk, the hollow portion is arranged offset from the standard area.

[0026] In the above solution, the hollow portion and the standard area are arranged offset from each other, enabling the mounting disk to switch between the calibration state with the hollow portion at the measurement station and the measurement state with the standard area at the measurement station. The switching process only requires rotating the mounting disk, without the need to disassemble and assemble the mounting disk, improving the calibration efficiency.

[0027] In some embodiments, the standard area includes a coating layer and a pole piece, a closed cavity is arranged inside the coating layer, and the pole piece is located inside the closed cavity.

[0028] In the above solution, on the one hand, the closed cavity plays a role in protecting the pole piece, reducing the risk of the pole piece being scratched and damaged by external objects. On the other hand, the closed cavity can reduce the risk of the components of the pole piece volatilizing, enabling the pole piece to be reused.

[0029] In some embodiments, along the circumferential direction of the standard member, the thicknesses of multiple standard areas gradually increase.

[0030] In the above solution, along the circumferential direction of the standard part, by arranging multiple standard areas with gradually increasing thicknesses, the standard part only needs to rotate in one direction to ensure that the areal density device can measure all the standard areas in sequence, improving the calibration efficiency and reducing the risk of missing measurements.

[0031] In some embodiments, the standard part is movably arranged on the mounting bracket along a first direction, multiple standard areas are arranged along the first direction, and the adjusting member is configured to drive the standard part to move along the first direction to adjust the positions of the multiple standard areas relative to the mounting bracket.

[0032] In the above solution, the standard part can move relative to the mounting bracket along the first direction. On the one hand, it is convenient to adjust the position of the standard part relative to the measurement station of the areal density device to obtain a better measurement effect; on the other hand, the standard part can be moved away from the measurement station of the areal density device, and the purpose of calibrating the areal density device can be achieved without setting a hollow part in the standard area, streamlining the processing procedure.

[0033] In some embodiments, in the embodiment where the standard part is movably arranged on the mounting bracket along the first direction, multiple standard areas are integrally formed.

[0034] In the above solution, multiple standard areas are integrally formed. On the one hand, it improves the structural strength of the standard part and reduces the risk of bending or breaking during the movement of the standard part along the first direction.

[0035] In some embodiments, multiple standard areas are arranged continuously along the first direction.

[0036] In the above solution, on the one hand, the continuous arrangement of multiple standard areas along the first direction makes the structure of the standard part more compact, reduces the length of the standard part along the first direction, and further reduces the risk of bending of the standard part. On the other hand, the continuous arrangement of multiple standard areas along the first direction also reduces the travel of the standard part during the calibration process, thereby reducing the time required for calibration and improving the calibration efficiency.

[0037] In some embodiments, along the first direction, the thicknesses of multiple standard areas gradually increase.

[0038] In the above solution, by arranging multiple standard areas with gradually increasing thicknesses, the standard part only needs to move along the first direction to ensure that the areal density device can measure all the standard areas in sequence, improving the calibration efficiency.

[0039] In some embodiments, the material of the standard area is steel.

[0040] In the above solution, steel enables the standard area to be reused, improving the service life of the standard area.

[0041] On the other hand, the embodiments of the present application further provide a method for calibrating a surface density device, including: installing a surface density device calibration device on the surface density device, measuring the surface density values of multiple standard areas through the surface density device, obtaining the relative surface density values of the electrode sheets corresponding to the multiple standard areas at the current ambient temperature, and performing linear regression analysis based on the surface density values of the multiple standard areas and the relative surface density values of the multiple standard areas to calibrate the surface density device through a standard part.

[0042] By using a standard part to replace the traditional electrode sheet for calibration, and the relative surface density values corresponding to the standard areas are known in advance, the weighing process in the traditional calibration process is saved, the calibration efficiency is improved, and one standard part can be used for calibrating the formulations of multiple electrode sheets, saving the calibration cost.

[0043] In some embodiments, before obtaining the relative surface density values of the electrode sheets corresponding to the multiple standard areas at the current ambient temperature, the calibration method further includes: at a set ambient temperature, calibrating the surface density device through the electrode sheet. Measuring the surface density values of the multiple standard areas using the calibrated surface density device to obtain the relative surface density values of the electrode sheets corresponding to the multiple standard areas at the current ambient temperature. Changing the ambient temperature and repeating the above steps.

[0044] In the above solution, the surface density device is calibrated through the electrode sheet, and the surface density value obtained by measuring the standard area with the calibrated surface density device is the relative surface density value reflecting the surface density of the electrode sheet, so that the standard area can be used to replace the electrode sheet for calibration.

[0045] In some embodiments, calibrating the surface density device through the electrode sheet includes: manufacturing multiple electrode sheets with different surface densities, measuring the surface density values of each electrode sheet through the surface density device, obtaining the true surface density values of each electrode sheet, and performing linear regression analysis based on the true surface density values of the multiple electrode sheets and the surface density values of the multiple electrode sheets to calibrate the surface density device through the electrode sheet.

[0046] In some embodiments, obtaining the true surface density values of multiple electrode sheets includes: respectively sampling multiple electrode sheets, weighing each sample through a weighing device, and calculating the true surface density value of the electrode sheet corresponding to the sample according to the weight and area of the sample.

[0047] In some embodiments, the number of samples taken from each electrode sheet is multiple, and the true surface density value of each electrode sheet is the average of the surface density values of the corresponding multiple samples.

[0048] In the above solution, by taking multiple samples from the electrode sheet and calculating the average of the surface density values of the multiple samples, the risk that the true surface density value has an error is reduced, and the accuracy in subsequent calibration of the surface density device is improved.

[0049] In some embodiments, the number of samples taken from each pole piece is 6-12.

[0050] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. Description of the Drawings

[0051] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0052] Figure 1 is a schematic structural diagram of a surface density device calibration device provided by some embodiments of the present application;

[0053] Figure 2 is a schematic structural diagram of a mounting bracket provided by some embodiments of the present application;

[0054] Figure 3 is a schematic structural diagram of a standard part (the standard part does not have a mounting disc) provided by some embodiments of the present application;

[0055] Figure 4 is a schematic structural diagram of a standard part (the standard part has a mounting disc) provided by some embodiments of the present application;

[0056] Figure 5 is a schematic connection diagram of a standard area and a mounting disc provided by some embodiments of the present application;

[0057] Figure 6 is a schematic connection diagram of a standard area and a mounting disc provided by some other embodiments of the present application;

[0058] Figure 7 is a schematic structural diagram of a standard part (through holes are provided on the mounting disc, and the through holes correspond to the standard areas one by one) provided by some embodiments of the present application;

[0059] Figure 8 is a schematic structural diagram of a standard part (through holes are provided on the mounting disc, and one through hole corresponds to multiple standard areas) provided by some embodiments of the present application;

[0060] Figure 9 is a schematic structural diagram of a standard area provided by some embodiments of the present application;

[0061] Figure 10 is a schematic structural diagram of a standard area provided by some other embodiments of the present application;

[0062] Figure 11 Schematic diagram of the cooperation between the standard area and the mounting bracket provided for some embodiments of the present application;

[0063] Figure 12 Schematic diagram of the structure of the standard parts (multiple standard areas arranged in the first direction) provided for some embodiments of the present application;

[0064] Figure 13 Top view structural schematic diagram of the cooperation between the support disk and the standard parts provided for some embodiments of the present application;

[0065] Figure 14 Schematic diagram of the setting of the measurement holes of the support disk provided for some embodiments of the present application;

[0066] Figure 15 Flow chart of the surface density device calibration method provided for some embodiments of the present application.

[0067] The reference numerals in the specific embodiments are as follows:

[0068] 10 - Surface density device; 11 - Detection component; 12 - Emission component; 20 - Calibration device; 21 - Adjustment component; 211 - Support disk; 212 - Measurement hole; 22 - Mounting bracket; 221 - Clamping part; 222 - Clamping bolt; 223 - Fixing part; 224 - Fixing bolt; 23 - Standard part; 231 - Standard area; 231a - Coating layer; 231b - Electrode sheet; 232 - Hollow part; 233 - Mounting disk; 234 - Through hole; 235 - Locking mechanism; 235a - Pressing ring; 235b - Connecting part. Detailed Description of the Specific Embodiments

[0069] Next, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0071] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0072] As used herein, the mention of "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0073] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0074] In the description of the embodiments of the present application, the term "a plurality of" means more than two. Similarly, "multiple groups" means more than two groups, and "multiple pieces" means more than two pieces.

[0075] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0076] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0077] In the embodiments of the present application, the same reference numerals represent the same components. For the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings of the embodiments of the present application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0078] The areal density device is a device for non-contact on-line detection of the areal density (weight per unit area) of an object. The areal density device usually includes a transmitting component and a detecting component. The transmitting component can emit rays, and the detecting component is used to detect the intensity of the rays. The rays emitted by the transmitting component pass through the object to be measured and shoot towards the detecting component. When the rays pass through the object to be measured, the intensity of the rays will attenuate. The attenuation ratio has a negative exponential relationship with the density of the object to be measured. Therefore, the detecting component can infer the areal density of the object to be measured by measuring the intensity of the received rays and comparing it with the intensity of the rays before passing through the object to be measured.

[0079] The electrode plate is an important component of the battery. The electrode plate usually includes a current collector layer and an active material layer. The active material layer is coated on the current collector layer. The thickness of the active material has a great influence on the performance of the battery, such as the capacity and service life. If the thickness of the active material is too small, the battery capacity will be too low. If the thickness of the active material is too large, the battery capacity will be too high, and the battery is prone to lithium plating phenomenon, reducing the service life of the battery. Therefore, during the production process of the electrode plate, it is necessary to detect the thickness of the active material layer to ensure the consistency of the areal density of the electrode plate. The areal density device has the characteristic of non-contact measurement, which can not only avoid the risk of easily scratching the electrode plate by traditional contact measurement devices, but also has a high measurement efficiency, and is suitable for measuring the areal density of the electrode plate.

[0080] The areal density device needs to be calibrated before use. The purpose of calibration is to find the correlation between the measured value of the measuring device and the areal density of the electrode plate. The traditional calibration method requires making a sample electrode plate in advance, measuring the sample electrode plate with the areal density device, then sampling the sample electrode plate, weighing the sampled sample with an electronic scale to calculate the actual areal density value of the electrode plate, and then performing linear regression on the data obtained by measuring the sample electrode plate with the areal density device and the actual areal density value of the electrode plate to achieve the process of calibrating the areal density device.

[0081] The inventor noticed that since it is difficult to store the electrode plate, if the electrode plate is used for calibration, a new electrode plate needs to be made every time a new areal density device needs to be calibrated. However, the coating process of the electrode plate includes multiple processes such as coating and drying, resulting in a long time-consuming production of the electrode plate, and thus low calibration efficiency.

[0082] Based on the problems existing in the above-mentioned prior art, the inventor conducted in-depth research and designed an areal density device calibration device, including a mounting frame, a standard part, and an adjusting part. The mounting frame is used to be installed on the areal density device. The standard part includes multiple standard areas with different densities. The adjusting part is connected to the standard part and the mounting frame, and the adjusting part is configured to adjust the positions of the multiple standard areas so that the multiple standard areas are successively moved to the detection station of the areal density device.

[0083] The standard part can be moved through the adjusting part so that the rays of the areal density device can pass through different standard areas. Then, the value measured by the areal density device is linearly regressed with the areal density value of the standard part for calibration. By using the standard part to replace the pole piece for calibrating the areal density device, the time consumed in manufacturing the pole piece is saved, and the calibration efficiency of the areal density device is improved.

[0084] In addition, the inventor also designed a method for calibrating an areal density device. The method includes installing the areal density device calibration device in the above embodiment on the areal density device, and calibrating the areal density device through the standard part in the calibration device.

[0085] This calibration method can achieve the calibration process of the areal density device without using the pole piece, improving the calibration efficiency.

[0086] According to some embodiments of the present application, please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of an areal density device 10 calibration device 20 provided by some embodiments of the present application; Figure 2 is a schematic structural diagram of a mounting bracket 22 provided by some embodiments of the present application. Some embodiments of the present application provide an areal density device 10 calibration device 20 for calibrating an areal density detection device. The areal density device 10 calibration device 20 includes a mounting bracket 22, a standard part 23, and an adjusting part 21. The mounting bracket 22 is used to be mounted on the areal density device 10. The standard part 23 includes a plurality of standard areas 231 with different densities. The adjusting part 21 is connected to the standard part 23 and the mounting bracket 22, and the adjusting part 21 is configured to adjust the positions of the plurality of standard areas 231 so that the plurality of standard areas 231 are sequentially moved to the detection station of the areal density device 10.

[0087] The areal density device 10 generally can include a transmitting part 12 and a detecting part 11. The transmitting part 12 and the detecting part 11 can be oppositely arranged. The transmitting part 12 can emit rays to the detecting part 11, and the detecting part 11 is used to detect the intensity of the rays. When the standard area 231 is arranged between the transmitting part 12 and the elastic part, the rays emitted by the transmitting part 12 pass through the standard area 231, and the areal density of the standard area 231 is measured by detecting the intensity of the rays through the detecting part 11.

[0088] The mounting bracket 22 is used to connect the standard part 23 to the areal density device 10 so that the rays of the areal density device 10 can pass through the standard area 231.

[0089] The mounting bracket 22 can be connected to the transmitting part 12 or the detecting part 11.

[0090] The mounting bracket 22 can be detachably connected to the areal density device 10 so that after the calibration of the areal density device 10 is completed, the calibration device 20 can be removed.

[0091] The mounting bracket 22 may include a clamping portion 221 for fixing the mounting bracket 22 to the areal density device 10.

[0092] The clamping portion 221 may include two spaced clamping units, with a clamping space formed between the two clamping units. When connecting the calibration device 20 to the areal density device 10, the areal density device 10 is clamped between the two clamping units to achieve the purpose of connecting the mounting bracket 22 to the areal density device 10.

[0093] The clamping unit may be provided with a clamping member for locking the mounting bracket 22 to the areal density device 10. For example, the clamping member may be a clamping bolt 222, and the clamping bolt 222 is threadedly connected to the clamping unit. When the areal density device 10 is clamped between the two clamping units, the clamping bolt 222 can be screwed to make the clamping bolt 222 abut against the outer wall surface of the areal density device 10, so that the mounting bracket 22 can be stably connected to the areal density device 10. One of the two clamping units may be provided with the clamping bolt 222, or both may be provided with the clamping bolt 222.

[0094] The clamping member may also be a spacer block. After the clamping unit is installed at the designated position, the spacer block is clamped between the clamping unit and the areal density device 10, so that the mounting bracket 22 can be stably connected to the areal density device 10.

[0095] The mounting bracket 22 may further include a fixing portion 223 for fixing the adjusting member 21 to the mounting bracket 22.

[0096] The fixing portion 223 may include two spaced fixing units, with a fixing space formed between the two fixing units. The adjusting member 21 is disposed between the two fixing units to connect the adjusting member 21 to the mounting bracket 22.

[0097] The fixing unit may be provided with a fixing member for locking the adjusting member 21 to the mounting bracket 22. For example, the fixing member may be a fixing bolt 224, and the fixing bolt 224 is threadedly connected to the fixing unit. When the adjusting member 21 is clamped between the two fixing units, the fixing bolt 224 can be screwed to make the fixing bolt 224 abut against the outer wall surface of the adjusting member 21, so that the adjusting member 21 can be stably connected to the mounting bracket 22. One of the two fixing units may be provided with the fixing bolt 224, or both may be provided with the fixing unit.

[0098] The fixing member may also be a spacer block. When the adjusting member 21 is clamped between the two fixing units, the spacer block is clamped between the adjusting member 21 and the fixing unit, so that the adjusting member 21 can be stably connected to the mounting bracket 22.

[0099] The clamping unit and the fixing unit can be connected through the first connecting portion, and the two fixing units can be connected through the second connecting portion, so that the clamping unit and the fixing unit are integrated to improve the fixing effect on the adjusting member 21. Further, the clamping unit, the fixing unit, the first connecting portion, and the second connecting portion can be integrally formed.

[0100] In the embodiment of the present application, the standard part 23 refers to a part whose surface density values corresponding to its respective standard areas 231 are known and can be reused when calibrating the surface density device 10.

[0101] The standard part 23 can include multiple standard areas 231 made of the same material. For example, the standard areas 231 are all made of stainless steel.

[0102] The standard part 23 can also include multiple standard areas 231 made of different materials. For example, the standard area 231 can be made of stainless steel or made of the pole piece 231b. The standard part 23 can simultaneously include a standard area 231 made of stainless steel and a standard area 231 made of the pole piece 231b.

[0103] The multiple standard areas 231 can be integrally formed. For example, the standard part 23 can be a whole, and the standard part 23 has multiple regions with different thicknesses, and these regions with different thicknesses form the standard areas 231 (different thicknesses result in different surface densities).

[0104] The multiple standard areas 231 can also be separate parts respectively. The standard areas 231 can be directly connected, or the standard areas 231 can be indirectly connected through other fixing parts 223. For example, the standard part 23 can also include a support member, and the standard area 231 is arranged on the support member.

[0105] The shapes of the multiple standard areas 231 can be the same or not completely the same. For example, all the standard areas 231 can be circular, or some of the standard areas 231 can be circular and some can be rectangular.

[0106] Among the multiple standard areas 231, all the standard areas 231 can have different thicknesses, or some of the standard areas 231 can have the same thickness.

[0107] The standard areas 231 can be fitted without gaps or with gaps.

[0108] The standard part 23 can be circular or oval, and can also be a polygonal structure such as a triangle, a rectangle, a pentagon, or a hexagon.

[0109] The standard area 231 can also be circular or oval, and can also be a polygonal structure such as a triangle, a rectangle, a pentagon, or a hexagon.

[0110] The adjusting member 21 can be selected according to the moving mode of the standard member 23 relative to the mounting bracket 22. For example, if the standard member 23 rotates relative to the mounting bracket 22, the adjusting member 21 can include a motor. The housing of the motor can be fixed to the fixing portion 223, and the output end of the motor is in transmission connection with the standard member 23 to drive the standard member 23 to rotate relative to the mounting bracket 22.

[0111] In this embodiment, the adjusting member 21 can further include a transmission structure. For example, the adjusting member 21 can further include a reducer. The output end of the motor is in transmission connection with the output end of the reducer, and the output end of the reducer is in transmission connection with the standard member 23.

[0112] If the standard member 23 moves linearly relative to the mounting bracket 22, the adjusting member 21 can include a cylinder. The housing of the cylinder can be fixed to the fixing portion 223, and the telescopic end of the cylinder is connected to the standard member 23 to drive the standard member 23 to move relative to the mounting bracket 22.

[0113] In this embodiment, the mounting bracket 22 can be provided with a guide rail, and the standard member 23 can be slidably connected to the guide rail to improve the moving accuracy of the standard member 23.

[0114] By adjusting each standard member 23 through the adjusting member 21, the standard area 231 at the measurement station of the surface density device 10 can be replaced, so as to measure the surface density measurement values of multiple standard areas 231. The surface density values corresponding to each standard area 231 of the standard member 23 can be measured in advance. By performing linear regression on the surface density measurement value of the standard area 231 and the surface density value corresponding to the standard area 231, the calibration process of the surface density device 10 can be completed.

[0115] By using the standard member 23 to replace the electrode sheet 231b to calibrate the surface density device 10, the production link of the electrode sheet 231b is omitted, thus saving the time required for calibration and improving the calibration efficiency.

[0116] The surface density value corresponding to the standard area 231 of the standard member 23 is known, and the standard member 23 can be reused. Therefore, the standard member 23 can be used to calibrate multiple surface density devices 10, further improving the calibration efficiency and the calibration accuracy.

[0117] According to some embodiments of the present application, please refer to Figure 1 , the standard member 23 is rotatably arranged on the mounting bracket 22, and a plurality of standard areas 231 are arranged around the rotation center of the standard member 23. The adjusting member 21 is configured to drive the standard member 23 to rotate relative to the mounting bracket 22 to adjust the positions of the plurality of standard areas 231.

[0118] The standard part 23 can be rotatably connected to the mounting bracket 22 through a rotating shaft. In an embodiment where the mounting bracket 22 includes a fixing part 223 or a clamping part 221, the standard part 23 can be rotatably connected to the fixing part 223 or the clamping part 221 through a rotating shaft, and the adjusting member 21 is drivingly connected to the rotating shaft to drive the standard part 23 to rotate.

[0119] The standard part 23 can also be directly rotatably connected to the adjusting member 21. For example, in an embodiment where the adjusting member 21 includes a motor, the output end of the motor can be drivingly connected to the standard part 23, and the output end of the motor not only functions to support the standard part 23 but also functions to drive the standard part 23 to rotate.

[0120] In this embodiment, the standard area 231 can be a fan-shaped structure. On the one hand, it enables a plurality of standard areas 231 to be arranged in sequence around the rotation center of the standard part 23. On the other hand, the fan-shaped structure enables a plurality of standard areas 231 to be closely arranged, increasing the area of a single standard area 231 and reducing the risk that the ray of the areal density device 10 cannot irradiate the standard area 231 due to a positional deviation of the standard area 231.

[0121] In an embodiment where the areal density device 10 includes a transmitting member 12 and a detecting member 11, when specifically installing the standard part 23, the standard part 23 can be at least partially disposed between the transmitting member 12 and the detecting member 11, so that during the rotation of the standard part 23, it can always be ensured that one of the standard areas 231 can be irradiated by the ray of the areal density device 10.

[0122] Under the driving action of the adjusting member 21, the standard part 23 can rotate relative to the mounting bracket 22 to switch the standard area 231 in the detection station of the areal density device 10 to meet the calibration requirements of the areal density device 10. During the switching process, the standard part 23 only rotates relative to the mounting bracket 22, and the connection position between the standard part 23 and the mounting bracket 22 does not change, facilitating the control of the position of the standard area 231 and reducing the risk that the ray of the areal density device 10 cannot irradiate the standard area 231 due to a positional deviation of the standard area 231.

[0123] According to some embodiments of the present application, please refer to Figure 3 , Figure 3 FIG. is a schematic structural diagram of the standard part 23 (the standard part 23 does not have a mounting disk 233) provided by some embodiments of the present application. In an embodiment where the standard part 23 is rotatably disposed on the mounting bracket 22, a plurality of standard areas 231 are integrally formed.

[0124] A plurality of standard areas 231 can be integrally formed into an annular structure, and a connecting member 235b can be disposed in the middle of the annular structure so that a plurality of standard areas 231 can be connected to the adjusting member 21.

[0125] The multiple standard areas 231 can also be integrally formed into a disc structure, and the center of the disc structure is connected to the adjusting member 21.

[0126] The integral formation of the multiple standard areas 231, on the one hand, improves the structural strength of the standard part 23 and extends the service life of the standard part 23. On the other hand, the relative positions of the standard areas 231 are fixed, reducing the risk that the surface density device 10 cannot accurately measure the surface density of the standard area 231 due to the offset of the standard area 231 during the calibration of the surface density device 10.

[0127] According to some embodiments of the present application, please refer to Figure 4 , Figure 4 FIG. 10 is a schematic structural diagram of the standard part 23 (the standard part 23 has an installation disc 233) provided by some embodiments of the present application. The mounting bracket 22 further includes an installation disc 233, and a plurality of standard areas 231 are arranged around the outside of the installation disc 233, and the installation disc 233 is connected to the adjusting member 21.

[0128] In an embodiment where the multiple standard areas 231 are integrally formed into a ring structure and a connecting member 235b is provided in the middle of the ring structure, the installation disc 233 can be the connecting member 235b in the above embodiment.

[0129] Please refer to Figure 5 , Figure 5 FIG. 20 is a schematic connection diagram of the standard area 231 and the installation disc 233 provided by some embodiments of the present application. The outside of the installation disc 233 can be the edge of the installation disc 233. For example, when the installation disc 233 is a disc structure, the outside of the installation disc 233 can be the outer peripheral surface of the installation disc 233. The outside of the installation disc 233 can also be a part of the installation disc 233 close to the edge. For example, please refer to Figure 6 , Figure 6 FIG. 24 is a schematic connection diagram of the standard area 231 and the installation disc 233 provided by some other embodiments of the present application. When the installation disc 233 is a disc structure, the outside of the installation disc 233 can be a part of the installation disc 233 close to the outer peripheral surface.

[0130] The standard area 231 is connected to the adjusting member 21 through the installation disc 233. On the one hand, it is convenient to install and fix the standard area 231. On the other hand, when driving the standard area 231 to rotate, the torque generated by the adjusting member 21 acts on the installation disc 233 and will not directly act on the standard area 231, reducing the risk of deformation of the standard area 231 due to force.

[0131] According to some embodiments of the present application, the standard area 231 and the installation disc 233 are integrally formed.

[0132] Please refer to Figure 5, when the standard area 231 and the mounting disk 233 are integrally formed, the thickness H of the mounting disk 233 can be made greater than the thickness of the standard area 231 to increase the strength of the mounting disk 233.

[0133] By integrally forming the standard area 231 and the mounting disk 233, the connection strength between the standard area 231 and the mounting disk 233 is increased, and the risk of the standard area 231 moving relative to the mounting disk 233 is reduced.

[0134] According to some embodiments of the present application, please refer to Figure 4 , a plurality of standard areas 231 are continuously arranged along the circumferential direction of the mounting disk 233.

[0135] The continuous arrangement of the standard areas 231 along the circumferential direction of the mounting disk 233 means that the respective standard areas 231 are arranged in sequence around the circumferential direction of the mounting disk 233, and there is no gap or the gap is extremely small between adjacent standard areas 231.

[0136] In this embodiment, the standard area 231 can be arranged along the circumferential direction of the mounting disk 233 in a circular shape.

[0137] When a plurality of standard areas 231 are arranged along the circumferential direction of the mounting disk 233, the junction of adjacent standard areas 231 can be integrally formed so that there is no gap between the standard areas 231, or adjacent standard areas 231 can be in close contact with each other so that the gap between the standard areas 231 is extremely small. Extremely small means that the gap between the standard areas 231 is less than 2 mm.

[0138] In this embodiment, the mounting disk 233 can be of a disk structure, which is convenient for a plurality of standard areas 231 to be arranged around the center of the mounting disk 233.

[0139] The continuous arrangement of the standard areas 231 along the circumferential direction of the mounting disk 233, on the one hand, increases the area through which the rays can pass through the standard areas 231, reduces the risk that the rays of the surface density device 10 cannot irradiate the standard areas 231 due to the too small area of the standard areas 231, and, with the increase of the area through which the rays can pass through the standard areas 231, it is convenient to measure the same standard area 231 multiple times and reduce the measurement error. On the other hand, when the mounting disk 233 rotates, the respective standard areas 231 can pass through the measurement station of the surface density device 10 in sequence to achieve the purpose of calibrating the surface density device 10, without manual replacement of the standard film, improving the calibration efficiency.

[0140] According to some embodiments of the present application, please refer to Figure 3 and Figure 4 , a hollowed-out portion 232 is provided in one of the plurality of standard areas 231.

[0141] In order to reduce the influence of environmental temperature and humidity on the measurement accuracy, the areal density device 10 needs to directly measure the intensity of the ray after passing through the air to calibrate the measurement of the subsequent standard area 231.

[0142] The hollow portion 232 is used for the ray of the areal density device 10 to pass through, facilitating the calibration of the areal density device 10.

[0143] The hollow portion 232 can be a calibration hole opened in the standard area 231. In the embodiment where the standard area 231 is fan-shaped, the calibration hole can be a fan-shaped hole concentric with the standard area 231.

[0144] The hollow portion 232 can also be a notch through groove extending to the edge of the standard area 231.

[0145] By providing the hollow portion 232 in the standard area 231, the calibration process of the areal density device 10 can be completed without disassembling the standard part 23, improving the calibration efficiency.

[0146] According to some embodiments of the present application, please refer to Figure 7 , Figure 7 FIG. is a schematic structural diagram of the standard part 23 (a through hole 234 is provided on the mounting disk 233, and the through hole 234 corresponds to the standard area 231 one by one) provided by some embodiments of the present application. The standard part 23 further includes a mounting disk 233. The mounting disk 233 is connected to the mounting frame 22. The mounting disk 233 is provided with a plurality of through holes 234 arranged at intervals along the circumferential direction of the mounting disk 233. The standard area 231 is mounted on the mounting disk 233, and one standard area 231 covers one through hole 234. The mounting disk 233 is connected to the adjusting member 21.

[0147] In this embodiment, the mounting disk 233 functions to fix and support the standard area 231, enabling the standard area 231 to be made of either a hard material or a soft material.

[0148] The shape of the through hole 234 can be circular, or can be a polygon such as a triangle, a rectangle, or a pentagon.

[0149] In this embodiment, each through hole 234 can be arranged along the circumferential direction of the mounting disk 233, enabling a plurality of standard areas 231 to be distributed in a circular pattern on the mounting disk 233. Thus, when the mounting disk 233 rotates, the standard area 231 can be switched on the areal density device 10.

[0150] In this embodiment, the mounting disk 233 can be a disk structure, and the through holes 234 can be arranged in a circular pattern around the center of the mounting disk 233.

[0151] The standard area 231 and the mounting disk 233 can be detachably connected. For example, the standard area 231 can be bonded to the mounting disk 233, or the standard area 231 can be pressed against the mounting disk 233 through other components.

[0152] The standard area 231 can completely cover the through hole 234 or partially cover the through hole 234.

[0153] By providing the through hole 234 on the mounting disk 233 for the ray to pass through, when the standard area 231 covers the through hole 234, the areal density device 10 can measure the areal density of the standard area 231. On the one hand, the mounting disk 233 plays a role in supporting and fixing the standard area 231, enabling the standard area 231 in the embodiments of the present application to be made of either a hard material or a soft material, thereby improving the applicable range of the standard area 231. On the other hand, the mounting disk 233 protects the standard area 231 and reduces the risk of the standard area 231 colliding with the outside.

[0154] According to some other embodiments of the present application, please refer to Figure 8 , Figure 8 which is a schematic structural diagram of the standard part 23 (the mounting disk 233 is provided with the through hole 234, and one through hole 234 corresponds to multiple standard areas 231) provided by some embodiments of the present application. The through hole 234 can be arc-shaped, and multiple standard areas 231 simultaneously cover the same through hole 234.

[0155] By corresponding one through hole 234 to multiple standard areas 231, it is convenient to flexibly arrange the positions of the standard areas 231, thereby improving the adaptability of the standard part 23.

[0156] According to some embodiments of the present application, please refer to Figure 7 , the mounting disk 233 is provided with a locking mechanism 235, and the locking mechanism 235 is configured to lock the standard area 231 to the mounting disk 233.

[0157] The locking mechanism 235 can lock the standard area 231 by applying pressure to the standard area 231. For example, the locking mechanism 235 can include a pressing member, and the standard area 231 is tightly pressed against the mounting disk 233 by the pressing member.

[0158] The locking mechanism 235 can also lock the standard area 231 by limiting the standard area 231. For example, the locking mechanism 235 can include a slot provided on the mounting disk 233, and the standard area 231 is inserted into the slot to lock the standard area 231.

[0159] By locking the standard area 231 to the mounting disk 233 through the locking mechanism 235, the risk of the standard area 231 moving relative to the mounting disk 233 is reduced, and the reliability of the standard part 23 is improved.

[0160] According to some embodiments of the present application, please refer to Figure 7, the locking mechanism 235 includes a pressure ring 235a and a connecting member 235b. The pressure ring 235a, the standard area 231, and the mounting plate 233 are stacked, with the standard area 231 located between the pressure ring 235a and the mounting plate 233, and the connecting member 235b connecting the pressure ring 235a and the mounting plate 233.

[0161] The pressure ring 235a is used to tightly press the standard area 231 against the mounting plate 233.

[0162] The pressure ring 235a can be a circular ring structure. When the pressure ring 235a is connected to the mounting plate 233, the pressure ring 235a can be arranged around the edge of the through hole 234 to avoid the pressure ring 235a blocking the standard area 231 and causing inaccurate measurement by the areal density device 10.

[0163] The connecting member 235b is used to connect the pressure ring 235a and the mounting plate 233 so that the pressure ring 235a can exert pressure on the standard area 231. The connecting member 235b can be a bolt and a nut. Connecting holes can be respectively provided on the mounting plate 233 and the pressure ring 235a. The rod portion of the bolt passes through the connecting holes of the two and is connected to the nut to connect the pressure ring 235a and the mounting plate 233. Alternatively, the connecting member 235b can have only a bolt without a nut. A threaded hole can be provided on the mounting plate 233, and a connecting hole can be provided on the pressure ring 235a. The bolt passes through the connecting hole of the pressure ring 235a and is threadedly connected to the threaded hole.

[0164] The connecting member 235b enables the pressure ring 235a to tightly press on the standard area 231, enabling the standard area 231 to be fixed to the mounting plate 233, reducing the risk of loosening of the standard area 231, and improving the reliability of the standard part 23. Furthermore, if the standard area 231 is made of a soft material, the pressure ring 235a can keep the standard area 231 in a straight state, reducing the risk of measurement errors caused by wrinkles in the standard area 231.

[0165] According to some embodiments of the present application, please refer to Figure 7 , the mounting plate 233 is provided with a hollowed-out portion 232, and along the circumferential direction of the mounting plate 233, the hollowed-out portion 232 is arranged offset from the standard area 231.

[0166] The hollowed-out portion 232 is used for the rays of the areal density device 10 to pass through, facilitating the calibration of the areal density device 10.

[0167] The hollowed-out portion 232 can be a hole separately opened on the mounting plate 233, or the hollowed-out portion 232 can be one of the multiple through holes 234 covered by the standard area 231 on the mounting plate 233.

[0168] The aperture of the hollowed-out portion 232 can be different from the aperture of the through hole 234, improving the user's recognition of the hollowed-out portion 232 and the through hole 234.

[0169] By providing a hollowed-out portion 232 on the mounting disc 233 instead of on the standard area 231, on the one hand, the risk of wear to the standard area 231 caused by machining the hollowed-out portion 232 is reduced, and on the other hand, the strength of the standard area 231 is increased, improving the service life of the standard area 231.

[0170] The hollowed-out portion 232 and the standard area 231 are arranged in a staggered manner, enabling the mounting disc 233 to switch between the calibration state where the hollowed-out portion 232 is at the measurement station and the measurement state where the standard area 231 is at the measurement station. The switching process only requires rotating the mounting disc 233 and does not require disassembling and assembling the mounting disc 233, improving the calibration efficiency.

[0171] According to some embodiments of the present application, please refer to Figure 9 , Figure 9 which is a schematic structural diagram of the standard area 231 provided by some embodiments of the present application. The standard area 231 includes a coating layer 231a and a pole piece 231b. A closed cavity is provided inside the coating layer 231a, and the pole piece 231b is located inside the closed cavity.

[0172] The pole piece 231b can have the same areal density value as the pole piece 231b used in actual production, thereby improving the calibration accuracy.

[0173] The coating layer 231a can be a thin film material. The coating layer 231a wraps around the outer wall surface of the pole piece 231b, causing the coating layer 231a to form a closed cavity.

[0174] The coating layer 231a can also be a coating applied to the surface of the pole piece 231b.

[0175] On the one hand, the closed cavity protects the pole piece 231b, reducing the risk of the pole piece 231b being scratched or damaged by external objects. On the other hand, the closed cavity can reduce the risk of the components of the pole piece 231b volatilizing, enabling the pole piece 231b to be reused. For example, if the pole piece 231b is not placed in the closed cavity, the moisture in the active material layer will volatilize, thereby causing a change in the areal density value of the pole piece 231b and generating a measurement error. Therefore, under the action of the closed cavity, the pole piece 231b can be reused, and the pole piece 231b is consistent with the pole piece 231b used in actual production, improving the calibration accuracy.

[0176] According to some embodiments of the present application, please refer to Figure 3 and Figure 4 , along the circumferential direction of the standard part 23, the thicknesses of multiple standard areas 231 gradually increase.

[0177] Since the linear regression equation during the calibration of the areal density device 10 is a unary linear equation, during the calibration process, the thickness value of the measured standard area 231 can be gradually increased to reduce the risk of missed measurement.

[0178] Along the circumferential direction of the standard part 23, by arranging multiple standard areas 231 with gradually increasing thicknesses, the standard part 23 only needs to rotate in one direction to ensure that the areal density device 10 can sequentially measure all the standard areas 231, improving the calibration efficiency and reducing the risk of missed measurement.

[0179] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , Figure 11 which is a schematic diagram of the cooperation between the standard area 231 and the mounting bracket 22 provided by some embodiments of the present application; Figure 12 which is a schematic structural diagram of the standard part 23 (with multiple standard areas 231 arranged in the first direction) provided by some embodiments of the present application. The standard part 23 is movably arranged on the mounting bracket 22 along the first direction, and multiple standard areas 231 are arranged in the first direction. The adjusting member 21 is configured to drive the standard part 23 to move along the first direction to adjust the position of the multiple standard areas 231 relative to the mounting bracket 22.

[0180] The first direction may be the direction indicated by the X-axis in the figure. In an embodiment where the areal density device 10 includes a transmitting member 12 and a detecting member 11, the transmitting member 12 and the detecting member 11 may be arranged along the second direction, and the first direction is perpendicular to the second direction, that is, the second direction may be the direction indicated by the Z-axis in the figure.

[0181] In this embodiment, the multiple standard areas 231 may be integrally formed or sequentially connected along the first direction.

[0182] The standard area 231 may be rectangular, and adjacent standard areas 231 may be connected edge to edge (long side to long side, or short side to short side), increasing the connection area between the standard areas 231 and thus improving the connection strength of the standard areas 231.

[0183] The adjusting member 21 may include a member having a reciprocating movable end. For example, the adjusting member 21 may include a cylinder or a hydraulic cylinder. The housing of the cylinder or hydraulic cylinder may be connected to the mounting bracket 22, and the telescopic end of the cylinder is connected to the standard part 23. The adjusting member 21 may also include a crank - connecting rod structure, which may include a crank, a connecting rod, and a moving part. The crank is rotatably connected to the mounting bracket 22, one end of the connecting rod is rotatably connected to the mounting bracket 22, the other end is rotatably connected to the moving part, the moving part is slidably connected to the mounting bracket 22 along the first direction, and the standard part 23 is connected to the moving part. When the crank rotates, the moving part can reciprocate along the first direction under the drive of the connecting rod.

[0184] The adjusting member 21 can be connected to one end of the standard member 23. For example, in the above embodiment, the telescopic end of the cylinder or the hydraulic cylinder can be connected to one end of the standard member 23.

[0185] Please refer to Figure 13 and Figure 14 , Figure 13 which is a top view structural schematic diagram of the cooperation between the support disk 211 and the standard member 23 provided by some embodiments of the present application; Figure 14 which is a schematic diagram of the setting of the measurement holes 212 of the support disk 211 provided by some embodiments of the present application. The adjusting member 21 can also be provided with a support disk 211. The support disk 211 is provided with measurement holes 212 adapted to the shape of the standard member 23. The standard member 23 covers the support disk 211, so that the projection of the standard area 231 on the support disk 211 is within the range of the measurement holes 212. The measurement holes 212 can prevent the rays of the areal density device 10 from passing through the support disk 211 when passing through the standard area 231, resulting in measurement errors. And the support disk 211 can support the standard member 23, reducing the risk of bending of the standard member 23.

[0186] The standard member 23 can move relative to the mounting frame 22 in the first direction. On the one hand, it is convenient to adjust the position of the standard member 23 relative to the measurement station of the areal density device 10 to obtain a better measurement effect; on the other hand, it enables the standard member 23 to be moved away from the measurement station of the areal density device 10, and the purpose of calibrating the areal density device 10 can be achieved without setting a hollowed-out portion 232 in the standard area 231, streamlining the processing procedure and reducing the risk of inaccurate measurement caused by wear of the standard area 231 due to processing of the standard area 231.

[0187] According to some embodiments of the present application, please refer to Figure 12 , in the embodiment where the standard member 23 is movably arranged on the mounting frame 22 in the first direction, a plurality of standard areas 231 are integrally formed.

[0188] A plurality of standard areas 231 can be integrally formed into a strip-shaped structure, which is convenient for switching the standard area 231 in the measurement station of the areal density device 10 when the standard member 23 moves in the first direction.

[0189] The integral formation of a plurality of standard areas 231, on the one hand, improves the structural strength of the standard member 23 and reduces the risk of bending or breaking of the standard member 23 during the movement in the first direction; on the other hand, it makes the relative positions between the standard areas 231 fixed, and reduces the risk that the standard areas 231 shift during the calibration of the areal density device 10, resulting in the areal density device 10 being unable to accurately measure the areal density of the standard areas 231.

[0190] According to some embodiments of the present application, please refer to Figure 12, along the first direction, a plurality of standard regions 231 are arranged continuously.

[0191] The plurality of standard regions 231 are arranged in sequence along the first direction, and there is no gap or the gap is extremely small between adjacent standard regions 231.

[0192] When the plurality of standard regions 231 are arranged along the first direction, the junction of adjacent standard regions 231 can be integrally formed so that there is no gap between the standard regions 231, or adjacent standard regions 231 can be closely abutted against each other, making the gap between the standard regions 231 extremely small. Extremely small means that the gap between the standard regions 231 is less than 2 mm.

[0193] On the one hand, the continuous arrangement of the plurality of standard regions 231 along the first direction makes the structure of the standard member 23 more compact, reduces the length of the standard member 23 along the first direction, and thus reduces the risk of the standard member 23 bending. On the other hand, the continuous arrangement of the plurality of standard regions 231 along the first direction also reduces the stroke of the standard member 23 during the calibration process, thereby reducing the time required for calibration and improving the calibration efficiency.

[0194] According to some embodiments of the present application, please refer to Figure 12 , in the embodiment where the plurality of standard regions 231 are arranged continuously along the first direction, the thickness of the plurality of standard regions 231 gradually increases.

[0195] In the embodiment where the adjusting member 21 is connected to one end of the standard member 23, the thickest standard region 231 among the plurality of standard regions 231 can be close to the adjusting member 21, and the thinnest standard region 231 is far from the adjusting member 21, so as to reduce the risk of the standard member 23 bending.

[0196] By arranging the plurality of standard regions 231 with gradually increasing thickness, the standard member 23 only needs to move along the first direction to ensure that the surface density device 10 can sequentially measure all the standard regions 231, improving the calibration efficiency.

[0197] According to some embodiments of the present application, please refer to Figure 10 , Figure 10 This is a schematic structural diagram of the standard region 231 provided in some other embodiments of the present application. The material of the standard region 231 is steel.

[0198] The standard region 231 can be completely made of steel.

[0199] The standard region 231 can also be partially made of steel. For example, the standard region 231 can adopt a composite material containing steel.

[0200] The surface of the steel can be coated with a coating to improve the service life of the steel, and the coating can be an anti-rust coating.

[0201] The steel material can be stainless steel or aluminum alloy.

[0202] The steel material has good corrosion resistance and structural strength, enabling the standard area 231 to be reused and extending the service life of the standard area 231.

[0203] According to some embodiments of the present application, please refer to Figure 15 , the embodiments of the present application further provide a calibration method for the areal density device 10, and the calibration method includes the following steps:

[0204] S1: Install the calibration device 20 for the areal density device 10 in the above embodiments on the areal density device 10.

[0205] In the embodiment where the standard part 23 is rotatably arranged on the mounting frame 22, when installing the calibration device 20, one of the multiple standard areas 231 of the standard part 23 can be arranged at the measurement station of the areal density device 10, or the hollow part 232 of the standard part 23 can be arranged at the measurement station, so that when the standard part 23 rotates, different standard areas 231 can be moved to the measurement station.

[0206] In the embodiment where the standard part 23 is movably arranged on the mounting frame 22 along the first direction, when installing the calibration device 20, the standard part 23 can have a certain distance relative to the measurement station, so that the rays of the areal density device 10 can pass through the air to complete the calibration work.

[0207] If the areal density device 10 includes a housing, and both the emitting component 12 and the detecting component 11 are arranged in the housing, before installing the calibration device 20, it further includes the steps of opening the housing and moving the calibration device 20 into the housing.

[0208] If the emitting component 12 and the detecting component 11 of the areal density device 10 are separately arranged, the calibration device 20 can be installed on one of the emitting component 12 or the detecting component 11.

[0209] S2: Measure the areal density values of multiple standard areas 231 through the areal density device 10.

[0210] Before measuring the areal density of the standard area 231, the areal density device 10 can be calibrated first to improve the measurement accuracy of the areal density device 10. The calibration method is well-known to those skilled in the art and will not be elaborated here. The standard part 23 can also be cleaned to reduce the risk that impurities in the environment adhere to the standard area 231 and cause the measurement result to be too large.

[0211] During measurement, in the embodiment where the standard part 23 is rotatably arranged on the mounting bracket 22, the standard part 23 is driven to rotate by the adjusting member 21, and measurement is performed in the order of gradually increasing thickness of the standard area 231. In the embodiment where the standard part 23 is movably arranged on the mounting bracket 22 along the first direction, the standard part 23 is driven to move along the first direction by the adjusting member 21, and measurement is performed in the order of gradually increasing thickness of the standard area 231.

[0212] During measurement, multiple measurements can be taken to obtain the average value of the areal density values of the standard area 231 to improve measurement accuracy. When taking multiple measurements, the measurements can be performed in the same area of the standard area 231, or in different areas of the same standard area 231.

[0213] S3: Obtain the relative areal density values of the electrode sheets 231b corresponding to multiple standard areas 231 at the current ambient temperature.

[0214] The relative areal density value reflects the areal density value of the electrode sheet 231b corresponding to the standard sheet, and this value is pre-measured by the areal density device 10 calibrated by the electrode sheet 231b. Since in the battery production process, there are electrode sheets 231b with multiple different formulations (different formulations result in different areal density values in the electrode sheet 231b), therefore, after calibrating the areal density device 10 with electrode sheets 231b of different formulations, the relative areal density values measured by the areal density device 10 for the standard area 231 of the same standard part 23 are also different.

[0215] The relative areal density values can be pre-stored in a data set after measurement, and the data set can be a data table or a database, etc.

[0216] S4: Perform linear regression analysis based on the areal density values of multiple standard areas 231 and the relative areal density values of multiple standard areas 231 to calibrate the areal density device 10 with the standard part 23.

[0217] Through linear regression analysis, the linear relationship between the areal density value obtained from the areal density measurement standard area 231 and the relative areal density value can be described, thereby realizing the calibration process of the areal density device 10.

[0218] The regression equation obtained through linear regression analysis can be y = kx + b, where k represents the slope, b represents the constant term, the independent variable x can be the areal density value obtained from the areal density measurement standard area 231, and the dependent variable y can be the relative areal density value.

[0219] In this embodiment, the minimum extreme value of the areal density range of the multiple standard regions 231 can be less than the minimum extreme value of the areal density range of the electrode sheet 231b, and the maximum extreme value of the areal density range of the multiple standard regions 231 can be greater than the maximum extreme value of the areal density range of the electrode sheet 231b, such that the areal density range of the electrode sheet 231b is located within the areal density range of the standard regions 231. For example, if the density range of the electrode sheet 231b is 100 - 200 mg / m², then the density range of the multiple standard regions 231 can be 90 - 210 mg / m², so as to improve the linear regression accuracy.

[0220] When performing linear regression analysis, it further includes the step of obtaining the correlation coefficient of the regression equation. If the correlation coefficient is less than the threshold, repeat the above steps S1 to S4.

[0221] It should be noted that in the above method, the order of steps S2 and S3 can be adjusted. For example, step S2 can be performed first and then step S3, or step S3 can be performed first and then step S2, or steps S2 and S3 can be performed simultaneously.

[0222] By using the standard part 23 to calibrate instead of the traditional electrode sheet 231b, and the relative areal density values corresponding to the standard regions 231 are known in advance, the weighing process in the traditional calibration process is saved, the calibration efficiency is improved, and one standard part 23 can be used for the formula calibration of multiple electrode sheets 231b, saving the calibration cost.

[0223] According to some embodiments of the present application, before obtaining the relative areal density values of the electrode sheet 231b corresponding to the multiple standard regions 231 at the current ambient temperature, the calibration method further includes:

[0224] S5, at the set ambient temperature, calibrate the areal density device 10 with the electrode sheet 231b.

[0225] S6, use the calibrated areal density device 10 to measure the areal density values of the multiple standard regions 231 to obtain the relative areal density values of the electrode sheet 231b corresponding to the multiple standard regions 231 at the current ambient temperature.

[0226] Taking Table 1-1 below as an example, Table 1-1 gives a table for recording relative areal density values. In the table, the row number can be the identification number of each standard region 231 of the standard part 23, the column number can be the ambient temperature when measuring the standard part 23, and the cell records the relative areal density values corresponding to each standard region 231 at the ambient temperature during measurement.

[0227] Table 1-1

[0228]

[0229] In this embodiment, the ambient temperature is kept consistent when calibrating the areal density device 10 with the electrode tab 231b and when measuring the relative areal density value after calibration.

[0230] S7. Change the ambient temperature and repeat the above steps.

[0231] When measuring multiple standard areas 231, the ambient temperature can be changed after measuring the relative areal density values corresponding to all the standard areas 231 at one ambient temperature.

[0232] Calibrate the areal density device 10 with the electrode tab 231b. The areal density value obtained by measuring the standard area 231 with the calibrated areal density device 10 is the relative areal density value reflecting the areal density of the electrode tab 231b, so that the standard area 231 can be used to replace the electrode tab 231b for calibration.

[0233] According to some embodiments of the present application, S4. Calibrating the areal density device 10 with the electrode tab 231b includes:

[0234] S51. Fabricate multiple electrode tabs 231b with different areal densities.

[0235] In this embodiment, the number of electrode tabs 231b can be 7.

[0236] S52. Measure the areal density values of each electrode tab 231b with the areal density device 10.

[0237] S53. Obtain the true areal density values of each electrode tab 231b.

[0238] S54. Perform linear regression analysis based on the true areal density values and the areal density values of multiple electrode tabs 231b to calibrate the areal density device 10 with the electrode tab 231b.

[0239] According to some embodiments of the present application, S53. Obtaining the true areal density values of multiple electrode tabs 231b includes:

[0240] S531. Take samples from multiple electrode tabs 231b respectively;

[0241] When taking samples, holes can be punched in the electrode tab 231b, and the punched area forms a sample, which can be circular or rectangular.

[0242] S532. Weigh each sample with a weighing device;

[0243] S533. Calculate the true areal density value of the electrode tab 231b corresponding to the sample according to the weight and area of the sample.

[0244] Specifically, the ratio of the weight of the sample to the area of the sample is the true areal density value.

[0245] According to some embodiments of the present application, the number of samples taken from each pole piece 231 b is multiple, and the actual surface density value of each pole piece 231 b is the average of the surface density values of the corresponding multiple samples.

[0246] By taking multiple samples of the pole piece 231b and calculating the average of the areal density values of the multiple samples, the risk of errors in the true areal density value is reduced, and the accuracy of subsequent calibration of the areal density device 10 is improved.

[0247] According to some embodiments of the present application, the number of samples taken from each pole piece 231 b is 6-12.

[0248] According to some embodiments of this application, please refer to Figure 1 、 Figure 3 、 Figure 11 and Figure 12 . An embodiment of the present application provides a calibration device 20 for an area density device 10, which is used to calibrate an area density detection device. The calibration device 20 includes a mounting frame 22, a standard part 23, and an adjustment component 21. The mounting frame 22 is used to be installed on the area density device 10, the standard part 23 includes a plurality of standard areas 231 with different densities, and the adjustment component 21 connects the standard part 23 and the mounting frame 22. The adjustment component 21 is configured to adjust the positions of the plurality of standard areas 231 so that the plurality of standard areas 231 are moved one by one to the detection station of the area density device 10.

[0249] The plurality of standard areas 231 of the standard component 23 are integrally formed.

[0250] In some embodiments, the standard part 23 is rotatably disposed on the mounting frame 22, the standard part 23 is a disc structure, the standard area 231 is a fan-shaped structure, and multiple standard areas 231 are arranged in sequence around the rotation center of the standard part 23, and one of the multiple standard areas 231 is provided with a hollow portion 232.

[0251] In other embodiments, the standard component 23 is movably disposed on the mounting frame 22 along the first direction. The standard component 23 is a long strip structure. The standard area 231 is rectangular. Multiple standard areas 231 are arranged along the first direction.

[0252] According to some embodiments of the present application, an embodiment of the present application further provides a method for calibrating an areal density device 10, the calibration method comprising the following steps:

[0253] S1: Disassemble the outer shell of the areal density device 10 and install the areal density device 10 calibration device 20 in the above embodiment on the areal density device 10.

[0254] S2: Measure the areal density values of multiple standard areas 231 by the areal density device 10. Among them, each standard area 231 is measured multiple times to obtain the average value of the areal density value of each standard area 231.

[0255] S3: Obtain the relative areal density values of the electrode tabs 231b corresponding to the multiple standard areas 231 at the current ambient temperature.

[0256] S4: Perform a linear regression analysis based on the average values of the areal density values of the multiple standard areas 231 and the relative areal density values of the multiple standard areas 231 to calibrate the areal density device 10 by the standard part 23.

[0257] Among them, when performing the linear regression analysis, the correlation coefficient of the regression equation is obtained. If the correlation coefficient is less than 99.5%, repeat steps S1 - S4.

[0258] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A surface density device calibration apparatus for calibrating a surface density detection device, characterized in that, Comprising: A mounting bracket for mounting on the areal density device; A standard component including a plurality of standard areas with different densities, and one of the plurality of standard areas is provided with a hollowed-out portion; An adjusting component connecting the standard component and the mounting bracket, and the adjusting component is configured to adjust the positions of the plurality of standard areas so that the plurality of standard areas are successively moved to the detection station of the areal density device.

2. The areal density device calibration apparatus according to claim 1, wherein The standard component is rotatably arranged on the mounting bracket, the plurality of standard areas are arranged around the rotation center of the standard component, and the adjusting component is configured to drive the standard component to rotate relative to the mounting bracket to adjust the positions of the plurality of standard areas.

3. The surface density device calibration apparatus according to claim 2, characterized in that The plurality of standard areas are integrally formed.

4. The surface density device calibration apparatus according to claim 2, characterized in that, The mounting bracket further includes a mounting disk, the plurality of standard areas are arranged around the outside of the mounting disk, and the mounting disk is connected to the adjusting component.

5. The surface density device calibration apparatus according to claim 4, characterized in that, The standard area is integrally formed with the mounting disk.

6. The areal density device calibration apparatus according to claim 5, characterized in that The plurality of standard areas are continuously arranged along the circumferential direction of the mounting disk.

7. The areal density device calibration apparatus according to claim 2, characterized in that, The standard component further includes a mounting disk, the mounting disk is connected to the mounting bracket, the mounting disk is provided with a plurality of through holes arranged at intervals along the circumferential direction of the mounting disk, the standard area is mounted on the mounting disk, one standard area covers one through hole, and the mounting disk is connected to the adjusting component.

8. The surface density device calibration apparatus according to claim 7, characterized in that, The mounting disk is provided with a locking mechanism configured to lock the standard area to the mounting disk.

9. The areal density device calibration apparatus according to claim 8, wherein, The locking mechanism includes a pressure ring and a connecting piece, the pressure ring, the standard area and the mounting disk are stacked, the standard area is located between the pressure ring and the mounting disk, and the connecting piece connects the pressure ring and the mounting disk.

10. The surface density device calibration apparatus according to claim 7, wherein, The mounting disk is provided with a hollowed-out portion, and along the circumferential direction of the mounting disk, the hollowed-out portion is arranged offset from the standard area.

11. The surface density device calibration apparatus according to claim 7, wherein, The standard area includes a coating layer and a pole piece, a closed cavity is arranged inside the coating layer, and the pole piece is located inside the closed cavity.

12. The surface density device calibration apparatus according to any one of claims 1-11, characterized in that, Along the circumferential direction of the standard component, the thicknesses of the plurality of standard areas gradually increase.

13. The surface density device calibration apparatus according to claim 1, characterized in that, The standard component is movably arranged on the mounting bracket along a first direction, the plurality of standard areas are arranged along the first direction, and the adjusting component is configured to drive the standard component to move along the first direction to adjust the positions of the plurality of standard areas relative to the mounting bracket.

14. The surface density device calibration apparatus according to claim 13, characterized in that, The plurality of standard areas are integrally formed.

15. The surface density device calibration apparatus according to claim 14, wherein Along the first direction, the plurality of standard areas are continuously arranged.

16. The surface density device calibration apparatus according to claim 13, characterized in that, Along the first direction, the thicknesses of the plurality of standard areas gradually increase.

17. The areal density device calibration apparatus according to any one of claims 1-11, characterized in that The material of the standard area is steel.

18. A method for calibrating a surface density device, characterized in that, Comprising: Installing the areal density device calibration device according to any one of claims 1-17 on the areal density device; Measuring the areal density values of the plurality of standard areas by the areal density device; Obtaining the relative areal density values of the pole pieces corresponding to the plurality of standard areas at the current ambient temperature; Performing linear regression analysis based on the areal density values of the plurality of standard areas and the relative areal density values of the plurality of standard areas to calibrate the areal density device by the standard component.

19. The method for calibrating a surface density device according to claim 18, wherein Before obtaining the relative areal density values of the pole pieces corresponding to the plurality of standard areas at the current ambient temperature, the calibration method further includes: Calibrating the areal density device by the pole piece at a set ambient temperature; Measure the areal density values of the multiple standard areas using the calibrated areal density device to obtain the relative areal density values of the pole pieces corresponding to the multiple standard areas at the current ambient temperature; Change the ambient temperature and repeat the above steps.

20. The method for calibrating the areal density device according to claim 19, wherein Calibrating the areal density device with the pole piece includes: Fabricate multiple pole pieces with different areal densities; Measure the areal density values of each pole piece using the areal density device; Obtain the true areal density values of each pole piece; Perform linear regression analysis based on the true areal density values and the areal density values of the multiple pole pieces to calibrate the areal density device with the pole piece.

21. The calibration method of the areal density device according to claim 20, wherein Obtaining the true areal density values of the multiple pole pieces includes: Take samples from the multiple pole pieces respectively; Weigh each sample using a weighing device; Calculate the true areal density value of the pole piece corresponding to the sample based on the weight and area of the sample.

22. The method for calibrating the areal density device according to claim 21, wherein The number of samples taken from each pole piece is multiple, and the true areal density value of each pole piece is the average of the areal density values of the corresponding multiple samples.

23. The calibration method of the areal density device according to claim 22, wherein The number of samples taken from each pole piece is 6 - 12.

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