Surface density measurement device and coating system

Abstract

A surface density measurement device and a coating system. The surface density measurement device (100) comprises an emitter component (10), a first detector (20) and a second detector (30), the emitter component (10) being used for emitting rays to an object to be measured (700). A first measurement channel (21) for said object (700) to pass through is formed between the first detector (20) and the emitter component (10), and the first detector (20) can receive rays passing through said object (700) located in the first measurement channel (21), so as to measure the surface density of said object (700). A second measurement channel (31) through which an object to be measured (700) can pass is formed between the second detector (30) and the emitter component (10), and the second detector (30) can receive rays passing through said object (700) located in the second measurement channel (31), so as to measure the surface density of said object (700). The emitter component (10) is configured to synchronously emit rays to the object to be measured (700) which enters the first measurement channel (21) and the object to be measured (700) which enters the second measurement channel (31).

Description

Areal density measuring device and coating system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202311617041.0, filed on November 28, 2023, entitled “Area Density Measuring Device and Coating System,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to an areal density measuring device and a coating system. Background Art

[0004] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0005] The electrode is the most important component of the battery, and its quality directly affects the reliability of the entire battery. Therefore, the inspection and control of the manufacturing quality of the electrode, especially the gram weight of the material per unit area (areal density), is particularly important. Therefore, how to improve the accuracy of the areal density detection during the electrode coating process is an urgent problem to be solved.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides an areal density measuring device and a coating system, which can effectively improve the accuracy of areal density measurement.

[0008] In the first aspect, an embodiment of the present application provides a surface density measuring device, which includes a transmitting component, a first detector, and a second detector. The transmitting component is used to transmit rays to the object to be measured. A first detection channel for the object to be measured to pass through is formed between the first detector and the transmitting component, and the first detector is capable of receiving rays passing through the object to be measured in the first detection channel to measure the surface density of the object to be measured. A second detection channel for the object to be measured to pass through is formed between the second detector and the transmitting component, and the second detector is capable of receiving rays passing through the object to be measured in the second detection channel to measure the surface density of the object to be measured. The transmitting component is configured to be able to synchronously transmit rays to the object to be measured entering the first detection channel and the object to be measured entering the second detection channel.

[0009] On the one hand, the surface density measuring device of the present application uses an emitting component to synchronously emit rays to the object to be measured that enters the first detection channel and the object to be measured that enters the second detection channel. Compared with using two separate emitting components to respectively emit rays to the object to be measured located in the first detection channel and the object to be measured located in the second detection channel, the influence of the synchronization error between the two separate emitting components on the accuracy of the surface density measurement can be reduced; on the other hand, in the surface density measuring device of the present application, the path length of the object to be measured moving from the first detection channel to the second detection channel is a fixed value. When determining the positional correspondence between the first surface density and the second surface density, it is not necessary to use a meter to measure the distance, which can reduce the influence of the distance measurement error of the meter on the accuracy of the surface density measurement. In this way, the surface density measuring device of the present application can effectively improve the accuracy of the surface density measurement.

[0010] In some embodiments of the first aspect, the transmitting component is configured to be able to move back and forth along a first direction, and the first direction is perpendicular to the conveying direction of the object to be measured.

[0011] The above technical solution arranges the emitting component to move back and forth along the first direction so that the rays emitted by the emitting component can pass through different positions of the object to be measured along the first direction, thereby increasing the breadth of the ray scanning of the emitting component, thereby further improving the measurement accuracy of the surface density measuring device.

[0012] In some embodiments of the first aspect, the first detector and the second detector are respectively arranged on both sides of the emitting component along the second direction, and the first direction and the second direction are perpendicular to the conveying direction.

[0013] This is beneficial to improving the synchronization between the rays emitted by the emitting component to the object to be measured located in the first detection channel and the rays emitted by the emitting component to the object to be measured located in the second detection channel, thereby further improving the measurement accuracy of the surface density measuring device.

[0014] In some embodiments of the first aspect, the moving speed V1 of the emitting component and the conveying speed V2 of the object to be measured satisfy the relationship: V1 = a*(S / L)*V2, where a is a constant coefficient, S is the one-way path length of the emitting component moving back and forth in the first direction, and L is the path length of the object to be measured from the first detector to the second detector.

[0015] The above technical solution sets the moving speed V1 of the emitting component and the conveying speed V2 of the object to be measured to satisfy the above mapping relationship, so that the moving speed V1 of the emitting component can be flexibly adjusted according to the conveying speed V2 of the object to be measured, thereby effectively improving the flexibility and applicability of the surface density measuring device.

[0016] In some embodiments of the first aspect, a conveying direction of the object to be measured in the first detection channel is opposite to a conveying direction of the object to be measured in the second detection channel, so that the object to be measured can be conveyed in a Z-shaped conveying arrangement in the areal density measurement device, thereby improving the structural compactness of the areal density measurement device.

[0017] In some embodiments of the first aspect, the areal density measuring device further comprises a plurality of support rollers configured to support and guide the object to be measured. Some of the plurality of support rollers are disposed on opposite sides of the first detection channel along a third direction, and another portion of the plurality of support rollers are disposed on opposite sides of the second detection channel along the third direction, where the third direction is parallel to a conveying direction of the object to be measured.

[0018] The above technical solution sets support rollers, which can support the object to be measured to reduce the vibration of the object to be measured during transportation, thereby reducing the impact of the vibration of the object to be measured on the surface density measurement, which is beneficial to improving the measurement accuracy of the surface density measuring device.

[0019] In some embodiments of the first aspect, the surface density measuring device further includes a communication component, which is communicatively connected to the first detector and the second detector, and the communication module is used to obtain surface density information of the first detector and the second detector, and send the surface density information to a target device for coating the object to be measured.

[0020] The above technical solution, by setting up a communication component, can enable the surface density measuring device to automatically transmit the surface density information obtained by measuring the object to be measured to the target device used to coat the object to be measured, which can effectively improve the degree of automation, reduce manual intervention, and help reduce costs.

[0021] In some embodiments of the first aspect, the emitting component includes at least one of an X-ray generator, a beta ray generator, and a laser generator.

[0022] In a second aspect, the present application provides a coating system, comprising an unwinding device, a coating device, a winding device, and an areal density measuring device according to any of the above schemes. The unwinding device is used to provide a strip of material, the coating device is used to apply a coating to the surface of the strip of material, and the winding device is used to wind up the coated strip of material. The strip of material passes through a first detection channel and a second detection channel. Along the strip of material's travel direction, the first detection channel is located upstream of the coating device, and the second detection channel is located downstream of the coating device.

[0023] On the one hand, using one emitting component to synchronously emit radiation to the strip entering the first detection channel and the strip entering the second detection channel can reduce the impact of the synchronization error between the two separate emitting components on the accuracy of the surface density measurement, compared to using two separate emitting components to respectively emit radiation to the strip located in the first detection channel and the strip located in the second detection channel. On the other hand, in the surface density measuring device of the present application, the path length of the strip moving from the first detection channel to the second detection channel is a fixed value. When determining the positional correspondence between the surface density of the strip before coating and the surface density of the strip after coating, it is not necessary to use a meter to measure the distance, which can reduce the impact of the distance measurement error of the meter on the accuracy of the surface density measurement. In this way, the accuracy of the surface density measurement can be effectively improved, thereby improving the overall coating quality of the coating system.

[0024] In some embodiments of the second aspect, the coating system further comprises a drying device, which is located downstream of the coating device along the belt conveying direction. The drying device can dry the coating to improve the stability of the coating and make the coating less likely to fall off the substrate.

[0025] In some embodiments of the second aspect, the drying device is further located upstream of the second detection channel along the tape running direction.

[0026] The above technical solution arranges the drying device upstream of the second detection channel, so that after the strip is coated by the coating device and dried by the drying device, the surface density is measured through the second detection channel of the surface density measuring device. The stability of the dry film coating is relatively high, which can further reduce the surface density measurement error. The effect of real-time adjustment of relevant parameters of the coating device according to the net surface density of the dry film coating is better, which is conducive to further improving the overall coating quality of the coating system.

[0027] In some embodiments of the second aspect, two coating devices are provided, the two coating devices being arranged along the strip running direction, one of the two coating devices being used to apply a coating to one surface of the strip, and the other of the two coating devices being used to apply a coating to another surface of the strip. Two areal density measuring devices are provided, the two areal density measuring devices being respectively arranged corresponding to the two coating devices.

[0028] The above technical solution, by providing two coating devices and two surface density measuring devices, enables the coating system to achieve double-sided coating of the strip on one production line, thereby improving the coating efficiency of the coating system.

[0029] In some embodiments of the second aspect, the coating system further includes two drying devices, which are arranged corresponding to the two coating devices, and the drying devices are located downstream of the coating devices along the belt conveying direction.

[0030] By providing two drying devices, the above technical solution, on the one hand, enables the coating system to further dry the strip coating on a single assembly line, thereby further improving the coating efficiency of the coating system. On the other hand, after the first coating layer is dried to obtain a first dry film coating, the second coating layer is applied and the second areal density measurement device is used for measurement. The first dry film coating has a higher stability, which can further reduce the measurement error of the subsequent second areal density measurement device and the coating difficulty of the second coating device, thereby further improving the overall quality of the electrode coating.

[0031] In some embodiments of the second aspect, the coating system further comprises a detection device for measuring the surface density of the strip having both surfaces coated with the coating layer dried by the drying device.

[0032] The above technical solution, by providing a detection device, can measure the overall surface density of the electrode after coating as data for monitoring the electrode coating quality, thereby helping to improve the reliability of the coating system.

[0033] In some embodiments of the second aspect, the detection device is configured as an areal density measurement device, which can improve the consistency of the entire coating system.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0036] FIG1 is a schematic structural diagram of an areal density measurement device provided in some embodiments of the present application;

[0037] FIG2 is a schematic structural diagram of a ray trajectory formed on a measured object by an emitting component of an areal density measurement device provided in some embodiments of the present application;

[0038] FIG3 is a schematic structural diagram of a coating system provided in some embodiments of the present application;

[0039] FIG4 is a schematic structural diagram of another coating system provided in some embodiments of the present application.

[0040] The accompanying drawings in the specific implementation manner are as follows:

[0041] 100, areal density measuring device; 100a, first areal density measuring device; 100b, second areal density measuring device; 200, unwinding device; 300, coating device; 300a, first coating device; 300b, second coating device; 400, winding device; 500, drying device; 500a, first drying device; 500b, second drying device; 600, detection device; 700, object to be measured; 800, strip material;

[0042] 10. Transmitting component; 20. First detector; 21. First detection channel; 30. Second detector; 31. Second detection channel; 40. Support roller; 50. Communication component; X, first direction; Y, second direction; Z, third direction; H, one-way path. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0045] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0047] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. 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 application generally indicates that the related objects are in an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0049] The term "plurality" used in this application refers to two or more (including two).

[0050] In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0051] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0052] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0053] As an example, the battery cell can be a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in this application.

[0054] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0055] In some embodiments, the battery may be a battery pack, which includes a battery case and battery cells, wherein the battery cells or battery modules are housed in the battery case.

[0056] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0057] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0058] The pole piece is the most important component of the battery. Its quality directly affects the reliability of the entire battery. Therefore, the inspection and control of the manufacturing quality of the pole piece, especially the gram weight of the material per unit area (area density), is particularly important. The areal density of the pole piece is usually measured using an areal density measuring device. The areal density measuring device includes a transmitting component and a detector. When measuring the areal density of the pole piece, the transmitting component emits rays to the pole piece. The rays penetrate the pole piece and are received by the detector. By measuring the intensity of the rays before and after penetrating the pole piece, the areal density of the pole piece can be calculated.

[0059] At present, the coating system usually includes an unwinding device, a coating device, an areal density measuring device, a meter, and a winding device. In the entire coating process production line, multiple areal density measuring devices are usually used to measure the areal density of the electrode in different processes. Taking the current conventional three-areal density measuring device solution as an example, along the flow direction of the coating process production line, the first areal density measuring device is used to measure the areal density of the substrate, the second areal density measuring device is used to measure the first surface coating of the substrate and the total areal density of the substrate, and the third areal density measuring device measures the total areal density of the first surface coating, the second surface coating, and the substrate. The net areal density of the first surface coating and the net areal density of the second surface coating are calculated using the distance data measured by the meter to infer the measurement data of each areal density measuring device at the same position of the strip, and then the difference is taken.

[0060] For example, the net areal density of the first surface coating is the difference between the measurement data of the first areal density measuring device and the measurement data of the second areal density measuring device, wherein the positional correspondence between the measurement data of the first areal density measuring device and the measurement data of the second areal density measuring device is determined using the distance data of the meter; the net areal density of the second surface coating is the difference between the measurement data of the second areal density measuring device and the measurement data of the third areal density measuring device, wherein the positional correspondence between the measurement data of the second areal density measuring device and the measurement data of the third areal density measuring device is determined using the distance data of the meter.

[0061] According to the surface density data of the coating at different positions of the strip, the parameters such as the inlet slurry flow rate, outlet gap, and adjustment block of the coating device can be adjusted in a targeted manner to improve the uniformity of the coating, thereby improving the coating quality of the electrode.

[0062] However, the above scheme has certain errors in the synchronization between multiple surface density measuring devices, and there will also be certain errors in the process of the meter measuring distance data, which leads to poor surface density measurement accuracy in the entire coating process and the inability to accurately control the coating parameters of the coating device, resulting in poor coating quality of the entire electrode.

[0063] Based on the above considerations, the present application designs a surface density measuring device, which includes a transmitting component, a first detector and a second detector. The transmitting component is used to transmit rays to the object to be measured. A first detection channel for the object to be measured to pass through is formed between the first detector and the transmitting component. The first detector can receive rays passing through the object to be measured located in the first detection channel to measure the surface density of the object to be measured. A second detection channel for the object to be measured to pass through is formed between the second detector and the transmitting component. The second detector can receive rays passing through the object to be measured located in the second detection channel to measure the surface density of the object to be measured. Wherein, the transmitting component is configured to be able to synchronously transmit rays to the object to be measured entering the first detection channel and the object to be measured entering the second detection channel.

[0064] The surface density measuring device measures the object to be measured located in the first detection channel to obtain the first surface density of the object to be measured, and the surface density measuring device measures the object to be measured located in the second detection channel to obtain the second surface density of the object to be measured. On the one hand, the surface density measuring device of the present application uses an emitting component to synchronously emit rays to the object to be measured entering the first detection channel and the object to be measured entering the second detection channel. Compared with using two separate emitting components to respectively emit rays to the object to be measured located in the first detection channel and the object to be measured located in the second detection channel, the influence of the synchronization error between the two separate emitting components on the accuracy of the surface density measurement can be reduced; on the other hand, in the surface density measuring device of the present application, the path length of the object to be measured moving from the first detection channel to the second detection channel is a fixed value. When determining the positional correspondence between the first surface density and the second surface density, it is not necessary to use a meter to measure the distance, which can reduce the influence of the distance measurement error of the meter on the accuracy of the surface density measurement. In this way, the surface density measuring device of the present application can effectively improve the accuracy of the surface density measurement.

[0065] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical devices using batteries.

[0066] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0067] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including battery boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0068] FIG1 is a schematic structural diagram of an areal density measuring device provided in some embodiments of the present application, and FIG2 is a schematic structural diagram of a ray trajectory formed on an object to be measured by an emitting component of the areal density measuring device provided in some embodiments of the present application.

[0069] 1 and 2 , an embodiment of the present application provides an areal density measuring device 100, which includes a transmitting component 10, a first detector 20, and a second detector 30. The transmitting component 10 is used to transmit rays to the object to be measured 700. A first detection channel 21 for the object to be measured 700 to pass through is formed between the first detector 20 and the transmitting component 10. The first detector 20 is capable of receiving rays passing through the object to be measured 700 located in the first detection channel 21 to measure the areal density of the object to be measured 700. A second detection channel 31 for the object to be measured 700 to pass through is formed between the second detector 30 and the transmitting component 10. The second detector 30 is capable of receiving rays passing through the object to be measured 700 located in the second detection channel 31 to measure the areal density of the object to be measured 700. The transmitting component 10 is configured to be able to synchronously transmit rays to the object to be measured 700 entering the first detection channel 21 and the object to be measured 700 entering the second detection channel 31.

[0070] The emitting component 10 can emit rays to the object 700. After the rays penetrate the object 700, they are received by the first detector 20 and the second detector 30. The first detector 20 and the second detector 30 can calculate the surface density of the object 700 by measuring the intensity of the rays before and after penetrating the object 700.

[0071] The emitting component 10 can be a radiation generator. For example, it can be an X-ray generator, a beta-ray generator, or the like. Depending on the object under test 700 , the emitting component 10 can emit different types of radiation. For example, when the object under test 700 is a positive electrode, the emitting component 10 can be an X-ray generator and emit X-rays; when the object under test 700 is a negative electrode, the emitting component 10 can be a beta-ray generator and emit beta rays. The emitting component 10 can also be a laser generator, depending on the actual application environment.

[0072] The first detector 20 and the second detector 30 can be ionization chambers that can measure the intensity of ionizing radiation, that is, the intensity of the radiation, by utilizing the ionizing radiation effect of ionizing radiation. The first detector 20 and the second detector 30 have internal working circuits that can calculate the surface density of the object 700 based on the intensity of the radiation emitted by the emitting component 10 and the intensity of the radiation received by the emitting component 10.

[0073] The object under test 700 may be a positive electrode sheet or a negative electrode sheet of a lithium battery, or may be other thin sheet products such as a separator or paper.

[0074] The emitting component 10 and the first detector 20 are arranged face to face to form a first detection channel 21 or a first detection gap, and the emitting component 10 and the second detector 30 are arranged face to face to form a second detection channel 31 or a second detection gap.

[0075] For example, under the power of conveying components such as rollers or conveyor belts, the object to be measured 700 can pass through the first detection channel 21 and the second detection channel 31 in succession during continuous movement. The surface density measuring device 100 measures the object to be measured 700 located in the first detection channel 21 to obtain the first surface density of the object to be measured 700, and the surface density measuring device 100 measures the object to be measured 700 located in the second detection channel 31 to obtain the second surface density of the object to be measured 700.

[0076] On the one hand, the surface density measuring device 100 of the present application uses a transmitting component 10 to synchronously transmit rays to the object to be measured 700 entering the first detection channel 21 and the object to be measured 700 entering the second detection channel 31. Compared with using two separate transmitting components 10 to transmit rays to the object to be measured 700 located in the first detection channel 21 and the object to be measured 700 located in the second detection channel 31, respectively, the influence of the synchronization error between the two separate transmitting components 10 on the accuracy of the surface density measurement can be reduced; on the other hand, in the surface density measuring device 100 of the present application, the path length of the object to be measured 700 moving from the first detection channel 21 to the second detection channel 31 is a fixed value. When determining the positional correspondence between the first surface density and the second surface density, it is not necessary to use a meter to measure the distance, which can reduce the influence of the distance measurement error of the meter on the accuracy of the surface density measurement. In this way, the surface density measuring device 100 of the present application can effectively improve the accuracy of the surface density measurement.

[0077] In some embodiments, the transmitting component 10 is configured to be able to move back and forth along a first direction X, and the first direction X is perpendicular to the conveying direction of the object 700 .

[0078] For example, the first direction X can be understood as the width direction of the object 700, and the conveying direction of the object 700 can be understood as the length direction of the object 700. The emitting component 10 moves back and forth along the first direction X. The rays emitted by the emitting component 10 can scan the object 700 along the first direction X. At the same time, under the action of the movement of the object 700 along the conveying direction, the rays emitted by the emitting component 10 can form a "Z"-shaped ray trajectory on the object 700.

[0079] In this way, the above technical solution sets the emitting component 10 to move back and forth along the first direction X, so that the rays emitted by the emitting component 10 can pass through different positions of the object to be measured 700 along the first direction X, so as to increase the width of the ray scanning of the emitting component 10, thereby further improving the measurement accuracy of the surface density measuring device 100.

[0080] Optionally, the first detector 20 and the second detector 30 may move synchronously with the emitting component 10 to improve the accuracy of receiving rays.

[0081] In some embodiments, the first detector 20 and the second detector 30 are respectively disposed on both sides of the emitting component 10 along the second direction Y, and the first direction X and the second direction Y are perpendicular to the conveying direction.

[0082] For example, the second direction Y can be understood as the thickness direction of the object to be measured 700. The first detector 20 and the second detector 30 are respectively arranged on both sides of the emitting component 10 along the second direction Y, so that the first detector 20, the second detector 30 and the emitting component 10 are arranged in a collinear manner, and thus the rays emitted by the emitting component 10 to the object to be measured 700 located in the first detection channel 21 and the rays emitted by the emitting component 10 to the object to be measured 700 located in the second detection channel 31 are also collinear, which is conducive to improving the synchronization between the rays emitted by the emitting component 10 to the object to be measured 700 located in the first detection channel 21 and the rays emitted by the emitting component 10 to the object to be measured 700 located in the second detection channel 31, thereby further improving the measurement accuracy of the surface density measuring device 100.

[0083] In some embodiments, the moving speed V1 of the transmitting component 10 and the conveying speed V2 of the object to be measured 700 satisfy the relationship: V1 = a*(S / L)*V2, where a is a constant coefficient, S is the length of the one-way path H of the transmitting component 10 moving back and forth along the first direction X, and L is the path length of the object to be measured 700 from the first detector 20 to the second detector 30.

[0084] Exemplarily, the constant coefficient a means the number of one-way paths H during the round-trip movement of the emitting component 10 when the ray trajectory received by the first detector 20 and the ray trajectory received by the second detector 30 coincide at the same position of the object under test 700. As an example, the position of the object under test 700 corresponding to the first ray trajectory received by the first detector 20 is the same as the position of the object under test 700 corresponding to the 1+a-th ray trajectory received by the second detector 30. Wherein, a is a positive integer. Optionally, a can be, but is not limited to, 2, 4, 6, 8, 10, 12, 14, 16, 18, or 20, etc., and can be selected according to the actual application environment. L means the path length of the object under test 700 from the first detector 20 to the second detector 30. In other words, L is the path length of the object under test 700 moving from the first detection channel 21 to the second detection channel 31.

[0085] It should be noted that a unidirectional path H during the reciprocating movement of the emitting component 10 along the first direction X is a ray trajectory received by the first detector 20 and the second detector 30. In other words, the first ray trajectory refers to the first unidirectional path H during the reciprocating movement of the emitting component 10 along the first direction X, and the 1+a ray trajectory refers to the 1+a unidirectional paths H during the reciprocating movement of the emitting component 10 along the first direction X.

[0086] The above technical solution sets the moving speed V1 of the transmitting component 10 and the conveying speed V2 of the object to be measured 700 to satisfy the above mapping relationship, so that the moving speed V1 of the transmitting component 10 can be flexibly adjusted according to the conveying speed V2 of the object to be measured 700, thereby effectively improving the flexibility and applicability of the surface density measuring device 100.

[0087] In some embodiments, the conveying direction of the object 700 in the first detection channel 21 is opposite to the conveying direction of the object 700 in the second detection channel 31, so that the conveying of the object 700 in the surface density measuring device 100 can be in a "Z"-shaped belt layout, thereby improving the compactness of the structure.

[0088] In some embodiments, the areal density measuring device 100 further includes a plurality of support rollers 40, which are used to support and guide the movement of the object 700. Some of the plurality of support rollers 40 are disposed on opposite sides of the first detection channel 21 along the third direction Z, and another portion of the plurality of support rollers 40 are disposed on opposite sides of the second detection channel 31 along the third direction Z. The third direction Z is parallel to the conveying direction of the object 700.

[0089] Exemplarily, the first detection channel 21 is provided with support rollers 40 on both sides opposite to each other along the third direction Z. After the object 700 to be measured enters the first detection channel 21, the support rollers 40 provided on both sides opposite to each other along the third direction Z of the first detection channel 21 can support the object 700 to be measured, thereby reducing the jitter of the object 700 to be measured in the first detection channel 21; the second detection channel 31 is provided with support rollers 40 on both sides opposite to each other along the third direction Z. After the object 700 to be measured enters the second detection channel 31, the support rollers 40 provided on both sides opposite to each other along the third direction Z of the second detection channel 31 can support the object 700 to be measured, thereby reducing the jitter of the object 700 to be measured in the second detection channel 31.

[0090] In this way, the above technical solution sets a support roller 40, which can support the object to be measured 700 to reduce the shaking of the object to be measured 700 during the transportation process, thereby reducing the impact of the shaking of the object to be measured 700 on the surface density measurement, which is beneficial to improving the measurement accuracy of the surface density measuring device 100.

[0091] In some embodiments, the surface density measuring device 100 also includes a communication component 50, which is communicatively connected to the first detector 20 and the second detector 30. The communication module is used to obtain the surface density information of the first detector 20 and the second detector 30, and send the surface density information to the target device used to coat the object to be measured 700.

[0092] For example, when the object 700 passes through the first detection channel 21, the first detector 20 receives radiation that has passed through the object 700, and calculates the surface density of the object 700 based on the intensity of the radiation emitted by the emitting component 10 and the intensity of the radiation received, and generates first surface density information. The communication module communicates with the first detector 20 to obtain the first surface density information and sends the first surface density information to the target device used to coat the object 700. When the object 700 passes through the second detection channel 31, the second detector 30 receives radiation that has passed through the object 700, and calculates the surface density of the object 700 based on the intensity of the radiation emitted by the emitting component 10 and the intensity of the radiation received, and generates second surface density information. The communication module communicates with the second detector 30 to obtain the second surface density information and sends the second surface density information to the target device used to coat the object 700. The target device used to coat the object 700 can adjust its own relevant parameters based on the first surface density information and the second surface density information to improve coating uniformity. Alternatively, the target device may be a coating device in a coating system for coating a coating on a surface of a substrate of a pole piece.

[0093] In this way, the above technical solution, by setting up the communication component 50, can enable the surface density measuring device 100 to automatically transmit the surface density information obtained by measuring the object 700 to the target device used to coat the object 700, which can effectively improve the degree of automation, reduce manual intervention, and help reduce costs.

[0094] FIG3 is a schematic structural diagram of a coating system provided in some embodiments of the present application.

[0095] Continuing with reference to FIG3 , according to some embodiments of the present application, the present application further provides a coating system, comprising an unwinding device 200, a coating device 300, a rewinding device 400, and the surface density measuring device 100 of any of the above schemes, wherein the unwinding device 200 is used to provide a strip 800, the coating device 300 is used to apply a coating on the surface of the strip 800, and the rewinding device 400 is used to rewind the coated strip 800. The strip 800 passes through a first detection channel 21 and a second detection channel 31. Along the running direction of the strip 800, the first detection channel 21 is located upstream of the coating device 300, and the second detection channel 31 is located downstream of the coating device 300.

[0096] For example, in the coating system, the strip 800 provided by the unwinding device 200 can be the substrate of the electrode. Under the power of a conveying component such as a roller or a conveyor belt, the strip 800 first passes through the first detection channel 21 of the surface density measuring device 100. The surface density measuring device 100 measures the strip 800 located in the first detection channel 21 to obtain the surface density of the strip 800 before coating. Then, the strip 800 continues to be transported to the coating device 300. The coating device 300 applies a coating on the surface of the strip 800. The coated strip 800 continues to be transported to the second detection channel 31 of the surface density measuring device 100. The surface density measuring device 100 measures the coated strip 800 located in the second detection channel 31 to obtain the surface density of the coated strip 800. The difference between the surface density of the coated strip 800 and the surface density of the strip 800 before coating is the net surface density of the coating. The relevant parameters of the coating device 300 are adjusted in real time according to the net surface density of the coating, thereby improving the overall quality of the electrode coating.

[0097] In this way, the above-mentioned coating system adopts the surface density measuring device 100 of the present application to measure the surface density of the strip 800 before coating and the surface density of the strip 800 after coating, and then uses the difference between the two to obtain the net surface density of the coating. On the one hand, an emitting component 10 is used to synchronously emit rays to the strip 800 entering the first detection channel 21 and the strip 800 entering the second detection channel 31. Compared with using two separate emitting components 10 to respectively emit rays to the strip 800 located in the first detection channel 21 and the strip 800 located in the second detection channel 31, the influence of the synchronization error between the two separate emitting components 10 on the accuracy of the surface density measurement can be reduced; on the other hand, in the surface density measuring device 100 of the present application, the path length of the strip 800 moving from the first detection channel 21 to the second detection channel 31 is a fixed value. When determining the positional correspondence between the surface density of the strip 800 before coating and the surface density of the strip 800 after coating, it is not necessary to use a meter to measure the distance, which can reduce the influence of the distance measurement error of the meter on the accuracy of the surface density measurement. In this way, the accuracy of areal density measurement can be effectively improved, thereby improving the overall coating quality of the coating system.

[0098] In some embodiments, the coating system further includes a drying device 500 , which is located downstream of the coating device 300 along the belt conveying direction.

[0099] Exemplarily, the drying device 500 is located downstream of the coating device 300. After the coating device 300 coats the coating on the surface of the strip 800, the coated strip 800 continues to be transported to the drying device 500. The drying device 500 can dry the coating to improve the stability of the coating so that the coating is not easily removed from the substrate.

[0100] In some embodiments, the drying device 500 is also located upstream of the second detection channel 31 along the tape running direction.

[0101] For example, under the power of a conveying component such as a roller or a conveyor belt, the strip 800 first passes through the first detection channel 21 of the areal density measuring device 100. The areal density measuring device 100 measures the strip 800 in the first detection channel 21 to obtain the areal density of the strip 800 before coating. The strip 800 then continues to be transported to the coating device 300, which applies a coating on the surface of the strip 800. The coated strip 800 continues to be transported to the drying device 500, which dries the coating to obtain a dry film coating. The strip 800 coated with the dry film coating continues to be transported to the second detection channel 31 of the areal density measuring device 100. The areal density measuring device 100 measures the strip 800 coated with the dry film coating in the second detection channel 31 to obtain the areal density of the strip 800 after coating. The difference between the areal density of the strip 800 after coating and the areal density of the strip 800 before coating is the net areal density of the dry film coating. The relevant parameters of the coating device 300 are adjusted in real time according to the net surface density of the dry film coating, thereby improving the overall quality of the electrode coating.

[0102] The above technical solution arranges the drying device 500 upstream of the second detection channel 31, so that after the strip 800 is coated by the coating device 300 and dried by the drying device 500, the surface density is measured by the second detection channel 31 of the surface density measuring device 100. The stability of the dry film coating is relatively high, which can further reduce the surface density measurement error. The effect of real-time adjustment of relevant parameters of the coating device 300 according to the net surface density of the dry film coating is better, which is conducive to further improving the overall quality of the electrode coating.

[0103] FIG4 is a schematic structural diagram of another coating system provided in some embodiments of the present application.

[0104] Continuing with FIG4 , in some embodiments, two coating devices 300 are provided, and the two coating devices 300 are arranged along the belt conveying direction. One of the two coating devices 300 is used to apply a coating to one surface of the belt material 800, and the other of the two coating devices 300 is used to apply a coating to the other surface of the belt material 800. Two areal density measuring devices 100 are provided, and the two areal density measuring devices 100 are respectively arranged corresponding to the two coating devices 300.

[0105] For example, in order to more clearly illustrate the embodiments of the present application, the two coating devices 300 are respectively configured as the first coating device 300a and the second coating device 300b, and the two surface density measuring devices 100 are respectively configured as the first surface density measuring device 100a and the second surface density measuring device 100b are used as examples for explanation.

[0106] The first coating device 300a is located upstream of the second coating device 300b. The first coating device 300a is used to coat the first surface of the strip 800, and the second coating device 300b is used to coat the second surface of the strip 800. The first surface and the second surface are opposite to each other along the thickness direction of the strip 800. The first detection channel 21 of the first areal density measuring device 100a is located upstream of the first coating device 300a, and the second detection channel 31 of the first areal density measuring device 100a is located downstream of the first coating device 300a. The first detection channel 21 of the second areal density measuring device 100b is located upstream of the second coating device 300b, and the second detection channel 31 of the second areal density measuring device 100b is located downstream of the second coating device 300b.

[0107] Under the power of a conveying component such as a roller or a conveyor belt, the strip 800 first passes through the first detection channel 21 of the first surface density measuring device 100a. The first surface density measuring device 100a measures the strip 800 to obtain the initial surface density of the strip 800 before coating. The initial surface density of the strip 800 can be understood as the surface density of the substrate of the electrode. Then, the strip 800 continues to be transported to the first coating device 300a. The first coating device 300a applies a first coating on the first surface of the strip 800. The strip 800 coated with the first coating continues to be transported to the second detection channel 31 of the first surface density measuring device 100a. The first surface density measuring device 100a measures the strip 800 coated with the first coating to obtain the first surface density of the strip 800 after the first coating is applied. The first surface density of the strip 800 can be understood as the total surface density of the substrate and the first coating. The difference between the surface density of the first strip 800 and the surface density of the initial strip 800 is the net surface density of the first coating layer.

[0108] Next, the strip 800 coated with the first coating layer continues to be transported to the first detection channel 21 of the second areal density measuring device 100b. The second areal density measuring device 100b measures the strip 800 coated with the first coating layer to obtain the second areal density of the strip 800. The second areal density of the strip 800 can be understood as the total areal density of the substrate and the first coating layer. Then, the strip 800 coated with the first coating layer continues to be transported to the second coating device 300b. The second coating device 300b applies the second coating layer on the second surface of the strip 800. The strip 800 coated with the first coating layer and the second coating layer continues to be transported to the second detection channel 31 of the second areal density measuring device 100b. The second areal density measuring device 100b measures the strip 800 coated with the first coating layer and the second coating layer to obtain the third areal density of the strip 800 after the second coating layer is applied. The third areal density of the strip 800 can be understood as the total areal density of the substrate, the first coating layer, and the second coating layer. The difference between the surface density of the third strip 800 and the surface density of the second strip 800 is the net surface density of the second coating.

[0109] It should be noted that the areal density of the first strip 800 and the areal density of the second strip 800 in the above embodiment both refer to the total areal density of the substrate and the first coating layer. Since the strip 800 passes through rollers or swing rollers and other mechanical components during its transport from the second detection channel 31 of the first areal density measuring device 100a to the first detection channel 21 of the second areal density measuring device 100b, certain movement errors are likely to occur. Therefore, the first detection channel 21 of the second areal density measuring device 100b re-detects the total areal density of the substrate and the first coating layer to obtain the areal density of the second strip 800. The net areal density of the second coating layer is calculated using the second and third strip densities. This can filter out movement errors generated when the strip 800 passes through rollers or swing rollers and other mechanical components, thereby improving the overall accuracy of the areal density measurement.

[0110] The above technical solution, by providing two coating devices and two surface density measuring devices 100 , enables the coating system to achieve double-sided coating of the strip 800 on one production line, thereby improving the coating efficiency of the coating system.

[0111] In some embodiments, the coating system further includes two drying devices 500 , which are arranged corresponding to the two coating devices 300 . Along the conveying direction, the drying devices 500 are located downstream of the coating devices 300 .

[0112] For example, in order to more clearly illustrate the embodiment of the present application, the following description is given by taking an example in which two drying devices 500 are respectively configured as a first drying device 500a and a second drying device 500b.

[0113] The first drying device 500a is located downstream of the first coating device 300a, and the second drying device 500b is located downstream of the second coating device 300b. The first drying device 500a is located downstream of the second detection channel 31 of the first areal density measuring device 100a and upstream of the first detection channel 21 of the second areal density measuring device 100b. The second drying device 500b is located downstream of the second detection channel 31 of the second areal density measuring device 100b.

[0114] Under the power of a conveying component such as a roller or a conveyor belt, the strip 800 first passes through the first detection channel 21 of the first areal density measuring device 100a. The first areal density measuring device 100a measures the strip 800 to obtain the initial strip 800 areal density of the strip 800 before coating. The initial strip 800 areal density can be understood as the areal density of the substrate of the electrode. The strip 800 then continues to be transported to the first coating device 300a. The first coating device 300a applies a first coating layer on the first surface of the strip 800. The strip 800 coated with the first coating layer continues to be transported to the second detection channel 31 of the first areal density measuring device 100a. The first areal density measuring device 100a measures the strip 800 coated with the first coating layer to obtain the first strip 800 areal density of the strip 800 after the first coating layer is applied. The first strip 800 areal density can be understood as the total areal density of the substrate and the first coating layer. The difference between the surface density of the first strip 800 and the surface density of the initial strip 800 is the net surface density of the first coating layer.

[0115] Next, the web 800 coated with the first coating layer continues to be conveyed to the first drying device 500a, which dries the first coating layer to obtain a first dry film coating layer. The web 800 coated with the first dry film coating layer continues to be conveyed to the first detection channel 21 of the second areal density measuring device 100b, which measures the web 800 coated with the first dry film coating layer to obtain the second areal density of the web 800. The second areal density of the web 800 can be understood as the combined areal density of the substrate and the first dry film coating layer. The web 800 coated with the first dry film coating is then conveyed to the second coating apparatus 300b, which applies a second coating layer on the second surface of the web 800. The web 800 coated with the first and second dry film coating layers is then conveyed to the second detection channel 31 of the second areal density measuring apparatus 100b. The second areal density measuring apparatus 100b measures the web 800 coated with the first and second dry film coating layers to obtain a third areal density of the web 800 after the second coating layer has been applied. The third areal density of the web 800 can be understood as the total areal density of the substrate, the first dry film coating layer, and the second coating layer. The difference between the third areal density of the web 800 and the second areal density of the web 800 is the net areal density of the second coating layer.

[0116] Next, the web 800 coated with the first and second dry film coatings is conveyed to the second drying device 500b, where the second drying device 500b dries the second coating to obtain a second dry film coating. The web 800 coated with the first and second dry film coatings is then conveyed to the winding device 400 for winding.

[0117] By providing two drying devices 500, the above technical solution enables the coating system to further dry the coating of the strip 800 on a single assembly line, thereby further improving the coating efficiency of the coating system. Furthermore, after the first coating layer is dried to obtain a first dry film coating, the second coating layer is applied and the second areal density measuring device 100b is used for measurement. The first dry film coating has a higher stability, which can further reduce the subsequent measurement error of the second areal density measuring device 100b and the coating difficulty of the second coating device, thereby further improving the overall quality of the electrode coating.

[0118] Alternatively, the first drying device 500a may be located downstream of the first coating device 300a and upstream of the second detection channel 31 of the first areal density measuring device 100a, and the second drying device 500b may be located downstream of the second coating device 300b and upstream of the second detection channel 31 of the second areal density measuring device 100b. The selection can be made based on the actual application environment and will not be elaborated here.

[0119] In some embodiments, the coating system further includes a detection device 600 for measuring the surface density of the strip 800 , both surfaces of which are coated with the coating layer dried by the drying device 500 .

[0120] For example, the strip 800 coated with the first dry film coating and the second dry film coating first passes through the detection device 600 and then reaches the winding device 400 for winding. The detection device 600 measures the strip 800 coated with the first dry film coating and the second dry film coating to obtain the fourth strip 800 areal density. The fourth strip 800 areal density can be understood as the total areal density of the substrate, the first dry film coating, and the second dry film coating, that is, the overall areal density after the electrode coating is completed.

[0121] The above technical solution, by providing the detection device 600, can measure the overall surface density of the electrode after coating as data for monitoring the electrode coating quality, thereby helping to improve the reliability of the coating system.

[0122] Optionally, the detection device 600 may be an X-ray surface density measuring instrument, a β-ray surface density measuring instrument, or a laser ray integrated micro-spot surface density measuring instrument commonly used in the market.

[0123] In some embodiments, the detection device 600 is configured as the areal density measurement device 100 provided in an embodiment of the present application, which can improve the consistency of the entire coating system.

[0124] In order to better understand the areal density measuring device 100 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned areal density measuring device 100 in actual application is provided here for illustration.

[0125] An embodiment of the present application provides an areal density measuring device 100, comprising a transmitting component 10, a first detector 20, a second detector 30, and a plurality of support rollers 40. The transmitting component 10 is configured to transmit radiation toward an object 700. The transmitting component 10 is configured to be movable back and forth along a first direction X, wherein the first direction X is perpendicular to the conveying direction of the object 700. The moving speed V1 of the transmitting component 10 and the conveying speed V2 of the object 700 satisfy the relationship: V1 = a*(S / L)*V2, where a is a constant coefficient, S is the length of a one-way path H of the transmitting component 10 in its reciprocating motion along the first direction X, and L is the path length of the object 700 from the first detector 20 to the second detector 30.

[0126] A first detection channel 21 for the object to be measured 700 to pass through is formed between the first detector 20 and the emitting component 10. The first detector 20 is capable of receiving radiation that passes through the object to be measured 700 located in the first detection channel 21 to measure the surface density of the object to be measured 700. A second detection channel 31 is formed between the second detector 30 and the emitting component 10 for the object to be measured 700 to pass through. The second detector 30 is capable of receiving radiation that passes through the object to be measured 700 located in the second detection channel 31 to measure the surface density of the object to be measured 700. The emitting component 10 is configured to be able to synchronously emit radiation to the object to be measured 700 entering the first detection channel 21 and the object to be measured 700 entering the second detection channel 31. The first detector 20 and the second detector 30 are respectively arranged on both sides of the emitting component 10 along the second direction Y. The first direction X and the second direction Y are perpendicular to the conveying direction. The first detector 20 and the second detector 30 move synchronously with the emitting component 10. The conveying direction of the object 700 in the first detection channel 21 is opposite to the conveying direction of the object 700 in the second detection channel 31 .

[0127] The support roller 40 is used to support the object to be measured 700 and guide the movement of the object to be measured 700. Some of the multiple support rollers 40 are arranged on two opposite sides of the first detection channel 21 along the third direction Z, and another part of the multiple support rollers 40 are arranged on two opposite sides of the second detection channel 31 along the third direction Z. The third direction Z is parallel to the conveying direction of the object to be measured 700.

[0128] According to some embodiments of the present application, the present application further provides a coating system, comprising an unwinding device 200, a coating device 300, a rewinding device 400, and the surface density measuring device 100 of any of the above schemes, wherein the unwinding device 200 is used to provide a strip 800, the coating device 300 is used to apply a coating on the surface of the strip 800, and the rewinding device 400 is used to rewind the coated strip 800. The strip 800 passes through a first detection channel 21 and a second detection channel 31. Along the running direction of the strip 800, the first detection channel 21 is located upstream of the coating device 300, and the second detection channel 31 is located downstream of the coating device 300.

[0129] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An areal density measuring device, comprising: A transmitting component, used for transmitting rays to the object to be measured; A first detector, forming a first detection channel for the object to be measured to pass through with the emitting component, the first detector being capable of receiving the radiation passing through the object to be measured in the first detection channel to measure the surface density of the object to be measured; A second detector is formed with the emitting component to form a second detection channel for the object to be measured to pass through, and the second detector is capable of receiving the radiation passing through the object to be measured in the second detection channel to measure the surface density of the object to be measured; Wherein, the emitting component is configured to be able to synchronously emit the rays to the object under test entering the first detection channel and the object under test entering the second detection channel.

2. The surface density measuring device according to claim 1, wherein: The transmitting component is arranged to be able to move back and forth along a first direction, and the first direction is perpendicular to the conveying direction of the object to be measured.

3. The surface density measuring device according to claim 2, wherein: The first detector and the second detector are respectively arranged on two sides of the emitting component along a second direction, and the first direction and the second direction are perpendicular to the conveying direction in pairs.

4. The surface density measuring device according to claim 2, wherein: The moving speed V1 of the emitting component and the conveying speed V2 of the object to be measured satisfy the relationship: V1 = a*(S / L)*V2, wherein a is a constant coefficient, S is the one-way path length of the emitting component moving back and forth along the first direction, and L is the path length of the object to be measured from the first detector to the second detector.

5. The surface density measuring device according to any one of claims 1 to 4, wherein: The conveying direction of the object to be measured in the first detection channel is opposite to the conveying direction of the object to be measured in the second detection channel.

6. The surface density measuring device according to any one of claims 1 to 5, wherein: The surface density measuring device further comprises a plurality of supporting rollers, wherein the supporting rollers are used to support the object to be measured and guide the object to be measured to move; A portion of the plurality of support rollers is disposed on two opposite sides of the first detection channel along the third direction, and another portion of the plurality of support rollers is disposed on the first detection channel. The second detection channel is located along two opposite sides of the third direction, and the third direction is parallel to the conveying direction of the object to be detected.

7. The surface density measuring device according to any one of claims 1 to 6, wherein: The surface density measuring device also includes a communication component, which is communicatively connected to the first detector and the second detector. The communication module is used to obtain surface density information of the first detector and the second detector, and send the surface density information to a target device used to coat the object to be measured.

8. The surface density measuring device according to any one of claims 1 to 7, wherein: The emitting component includes at least one of an X-ray generator, a beta-ray generator, and a laser generator.

9. A coating system comprising: An unwinding device for providing the strip material; A coating device, used for coating the surface of the strip; A winding device, used for winding the strip coated with the coating; According to the surface density measuring device as described in any one of claims 1-8, the strip material passes through a first detection channel and a second detection channel, and along the strip material's running direction, the first detection channel is located upstream of the coating device, and the second detection channel is located downstream of the coating device.

10. The coating system according to claim 9, wherein: The coating system further comprises a drying device, which is located downstream of the coating device along the belt-moving direction.

11. The coating system according to claim 10, wherein: Along the belt running direction, the drying device is also located upstream of the second detection channel.

12. The coating system according to claim 9, wherein: The coating devices are provided in two numbers, and the two coating devices are provided along the belt-moving direction, one of the two coating devices is used for coating the coating on one surface of the belt material, and the other of the two coating devices is used for coating the coating on the other surface of the belt material; There are two surface density measuring devices, and the two surface density measuring devices are respectively arranged corresponding to the two coating devices.

13. The coating system according to claim 12, wherein: The coating system further comprises two drying devices, which are arranged corresponding to the two coating devices. Along the belt-moving direction, the drying devices are located downstream of the coating devices.

14. The coating system according to claim 13, wherein: The coating system further comprises a detection device, which is used to measure the surface density of the strip whose two surfaces are both coated with the coating dried by the drying device.

15. The coating system according to claim 14, wherein: The detection device is configured as the surface density measuring device.

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