Surface density measuring device and coating system

Abstract

The invention provides a surface density measuring device and a coating system. The surface density measuring device comprises an emitting part, a first detector and a second detector, wherein the emitting part is used for emitting rays to a measured object. A first detection channel for a detected object to pass through is formed between the first detector and the emission part, and the first detector can receive rays penetrating through the detected object located in the first detection channel so as to measure the surface density of the detected object. A second detection channel for the detected object to pass through is formed between the second detector and the emitting part, and the second detector can receive rays penetrating through the detected object located in the second detection channel so as to measure the surface density of the detected object. Wherein the emitting part is configured to be capable of synchronously emitting rays to a detected object entering the first detection channel and a detected object entering the second detection channel. According to the invention, the precision of surface density measurement can be effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a surface density measuring device and a coating system. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] The electrode sheet is the most important component of the battery, and the quality of the electrode sheet directly affects the reliability of the entire battery. Therefore, it is particularly important to detect and control the manufacturing quality of the electrode sheet, especially the gram weight (surface density) of the material per unit area. Therefore, how to improve the detection accuracy of the surface density during the electrode sheet coating process is an urgent problem to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a surface density measuring device and a coating system, which can effectively improve the accuracy of surface density measurement.

[0005] In a first aspect, an embodiment of this application provides a surface density measuring device. The surface density measuring device includes a transmitting component, a first detector, and a second detector. The transmitting component is used to emit 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 the 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 the 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. Among them, the transmitting component is configured to be able 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.

[0006] On the one hand, the surface density measuring device of this application uses one transmitting 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 transmitting 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, it can reduce the influence of the synchronization error between the two separate transmitting components on the accuracy of surface density measurement. On the other hand, in the surface density measuring device of this 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 position correspondence relationship between the first surface density and the second surface density, it is not necessary to use a counter to measure the distance, which can reduce the influence of the distance measurement error of the counter on the accuracy of surface density measurement. In this way, the surface density measuring device of this application can effectively improve the accuracy of surface density measurement.

[0007] In some embodiments of the first aspect, the emitting 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.

[0008] By arranging the emitting component to move back and forth along the first direction, the rays emitted by the emitting component can pass through different positions of the object to be measured along the first direction, so as to improve the scanning breadth of the rays of the emitting component, and thus the measurement accuracy of the surface density measuring device can be further improved.

[0009] 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 a second direction, and the first direction, the second direction and the conveying direction are perpendicular to each other in pairs.

[0010] It is beneficial to improve 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, and thus the measurement accuracy of the surface density measuring device can be further improved.

[0011] 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 along the first direction, and L is the path length of the object to be measured from the first detector to the second detector.

[0012] By setting 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, the moving speed V1 of the emitting component can be flexibly adjusted according to the conveying speed V2 of the object to be measured, and thus the flexibility and applicability of the surface density measuring device can be effectively improved.

[0013] In some embodiments of the first aspect, 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. So that the conveying of the object to be measured in the surface density measuring device can be in a Z-shaped tape running layout, and thus the structural compactness of the surface density measuring device can be improved.

[0014] In some embodiments of the first aspect, the surface density measuring device further includes a plurality of supporting rollers, and the supporting rollers are used to support the object to be measured and guide the movement of the object to be measured. A part of the plurality of supporting rollers is arranged on both sides of the first detection channel along a third direction opposite to each other, and another part of the plurality of supporting rollers is arranged on both sides of the second detection channel along a third direction opposite to each other, and the third direction is parallel to the conveying direction of the object to be measured.

[0015] Through the above technical solution, by providing a support roller, the support roller can support the object to be measured to reduce the jitter of the object to be measured during the conveying process, thereby reducing the influence on the surface density measurement caused by the jitter of the object to be measured, which is beneficial to improving the measurement accuracy of the surface density measurement device.

[0016] In some embodiments of the first aspect, the surface density measurement device further includes a communication component, the communication component is communicatively connected to the first detector and the second detector, and the communication module is configured to obtain the surface density information of the first detector and the second detector, and send the surface density information to the target device for coating the object to be measured.

[0017] Through the above technical solution, by providing a communication component, the surface density measurement device can automatically transmit the surface density information obtained by measuring the object to be measured to the target device for coating the object to be measured, which can effectively improve the degree of automation, reduce manual intervention, and is beneficial to cost reduction.

[0018] In some embodiments of the first aspect, the emitting component includes at least one of an X-ray generator, a β-ray generator, and a laser generator.

[0019] In a second aspect, the present application provides a coating system, the coating system includes an unwinding device, a coating device, a winding device, and the surface density measurement device according to any of the above solutions. The unwinding device is configured to provide a strip material, the coating device is configured to coat a coating on the surface of the strip material, and the winding device is configured to wind the strip material coated with the coating. The strip material passes through a first detection channel and a second detection channel. Along the running direction of the strip material, the first detection channel is located upstream of the coating device, and the second detection channel is located downstream of the coating device.

[0020] On the one hand, by using one emitting component to synchronously emit rays to the strip material entering the first detection channel and the strip material entering the second detection channel, compared with using two separate emitting components to respectively emit rays to the strip material located in the first detection channel and the strip material located in the second detection channel, it is possible to reduce the influence of the synchronization error between the two separate emitting components on the accuracy of the surface density measurement; on the other hand, in the surface density measurement device of the present application, the path length of the strip material moving from the first detection channel to the second detection channel is a fixed value. When determining the position correspondence relationship between the surface density of the strip material before coating and the surface density of the strip material after coating, it is not necessary to use a length counter for distance measurement, which can reduce the influence of the distance measurement error of the length counter 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.

[0021] In some embodiments of the second aspect, the coating system further includes a drying device. Along the running direction, the drying device is located downstream of the coating device. The drying device can dry the coating to improve the stability of the coating, so that the coating is not easily detached from the substrate.

[0022] In some embodiments of the second aspect, along the running direction of the strip, the drying device is further located upstream of the second detection channel.

[0023] Through the above technical solution, by arranging the drying device upstream of the second detection channel, after the strip material is coated by the coating device and dried by the drying device, it then passes through the second detection channel of the areal density measuring device for areal density measurement. The stability of the dry film coating is relatively high, thereby further reducing the areal density measurement error. The effect of adjusting the relevant parameters of the coating device in real time according to the net areal density of the dry film coating is relatively good, which is beneficial to further improving the overall coating quality of the coating system.

[0024] In some embodiments of the second aspect, two coating devices are provided. The two coating devices are arranged along the running direction of the strip. One of the two coating devices is used to coat a coating on one surface of the strip material, and the other of the two coating devices is used to coat a coating on the other surface of the strip material. Two areal density measuring devices are provided, and the two areal density measuring devices are respectively arranged corresponding to the two coating devices.

[0025] Through the above technical solution, by arranging two coating devices and two areal density measuring devices, the coating system can achieve double-sided coating of the strip material on one production line, thereby improving the coating efficiency of the coating system.

[0026] In some embodiments of the second aspect, the coating system further includes two drying devices. The two drying devices are arranged corresponding to the two coating devices. Along the running direction of the strip, the drying device is located downstream of the coating device.

[0027] Through the above technical solution, by arranging two drying devices, on the one hand, the coating system can further achieve drying of the coating on the strip material on one production line, thereby further improving the coating efficiency of the coating system. On the other hand, after drying the first coating to obtain the first dry film coating, then performing the coating work of the second coating and the measurement work of the second areal density measuring device, the stability of the first dry film coating is relatively high, thereby further reducing the measurement error of the subsequent second areal density measuring device and the coating difficulty of the second coating device, which is beneficial to further improving the overall quality of the electrode coating.

[0028] In some embodiments of the second aspect, the coating system further includes a detection device. The detection device is used to measure the areal density of the strip material with coatings dried by the drying device on both surfaces.

[0029] Through the above technical solution, by arranging the detection device, the overall areal density of the electrode after coating can be measured as data for monitoring the coating quality of the electrode, which is beneficial to improving the reliability of the coating system.

[0030] In some embodiments of the second aspect, the detection device is configured as a surface density measurement device, which can improve the consistency of the entire coating system.

[0031] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to 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 described below. Description of the Drawings

[0032] 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 throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 It is a schematic structural diagram of the surface density measurement device provided by some embodiments of the present application;

[0034] Figure 2 It is a schematic structural diagram of the ray trajectory formed by the emitting component of the surface density measurement device provided by some embodiments of the present application on the object to be measured;

[0035] Figure 3 It is a schematic structural diagram of a coating system provided by some embodiments of the present application;

[0036] Figure 4 It is a schematic structural diagram of another coating system provided by some embodiments of the present application.

[0037] The reference numerals in the specific embodiments are as follows:

[0038] 100, surface density measurement device; 100a, first surface density measurement device; 100b, second surface density measurement device; 200, unwind device; 300, coating device; 300a, first coating device; 300b, second coating device; 400, rewinding device; 500, drying device; 500a, first drying device; 500b, second drying device; 600, detection device; 700, object to be measured; 800, strip material.

[0039] 10, emitting 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 Embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts fall within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description 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 description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0042] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can 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 represents an "or" relationship between the associated objects before and after.

[0045] In the embodiments of this application, the same reference numerals represent the same components, and 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 in the embodiments of this application shown in the drawings, 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 this application.

[0046] In this application, "a plurality of" means two or more (including two).

[0047] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity as conventionally recognized in engineering.

[0048] 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-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of this application do not limit this.

[0049] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode sheet and the negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet, which can play a role in preventing short circuit between the positive and negative electrodes, and at the same time allow active ions to pass through.

[0050] 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, a multi-prismatic battery cell. The multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc., and this application has no special limitation.

[0051] The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0052] In some embodiments, the battery can be a battery pack. The battery pack includes a battery box body and battery cells, and the battery cells or battery modules are accommodated in the battery box body.

[0053] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0054] With the development of new energy technologies, batteries are more and more widely used, such as in mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0055] The electrode sheet is the most important component of the battery, and the quality of the electrode sheet directly affects the reliability of the entire battery. Therefore, it is particularly important to detect and control the manufacturing quality of the electrode sheet, especially the gram weight (surface density) of the material per unit area. Usually, a surface density measuring device is used to measure the surface density of the electrode sheet. The surface density measuring device includes a transmitting component and a detector. When measuring the surface density of the electrode sheet, the transmitting component emits rays to the electrode sheet, and the rays are received by the detector after passing through the electrode sheet. By measuring the ray intensity before and after passing through the electrode sheet, the surface density of the electrode sheet can be calculated.

[0056] At present, the coating system usually includes an unwinding device, a coating device, a surface density measuring device, a length counter, and a winding device. Usually, multiple surface density measuring devices are used to measure the surface density of the electrode sheets in different processes on the entire coating process production line. Taking the current conventional three-surface density measuring device solution as an example for illustration, along the flow direction of the coating process production line, the first surface density measuring device is used to measure the surface density of the base material, the second surface density measuring device is used to measure the total surface density of the first surface coating of the base material and the base material, and the third surface density measuring device is used to measure the total surface density of the first surface coating, the second surface coating, and the base material. The net surface density of the first surface coating and the net surface density of the second surface coating are calculated by using the distance data measured by the length counter to deduce the measurement data of each surface density measuring device at the same position of the strip material, and then taking the difference.

[0057] For example, the net surface density of the first surface coating is the difference between the measurement data of the first surface density measuring device and the measurement data of the second surface density measuring device. Among them, the position correspondence relationship between the measurement data of the first surface density measuring device and the measurement data of the second surface density measuring device is determined by using the distance data of the length counter; the net surface density of the second surface coating is the difference between the measurement data of the second surface density measuring device and the measurement data of the third surface density measuring device. Among them, the position correspondence relationship between the measurement data of the second surface density measuring device and the measurement data of the third surface density measuring device is determined by using the distance data of the length counter.

[0058] According to the surface density data of the coatings at different positions of the strip material, the parameters such as the inlet slurry flow rate, the outlet gap, and the adjustment block of the coating device can be adjusted specifically to improve the coating uniformity, thereby improving the coating quality of the electrode sheet.

[0059] However, due to certain errors in the synchronization between multiple surface density measuring devices in the above solution, there will also be certain errors in the process of the length counter measuring the distance data, resulting in poor surface density measurement accuracy in the entire coating process, unable to accurately control the coating parameters of the coating device, and making the entire coating quality of the electrode sheet poor.

[0060] Based on the above considerations, the present application designs a surface density measuring device. The surface density measuring device includes a transmitting component, a first detector, and a second detector. The transmitting component is configured to emit rays towards 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 the 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 the 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. Among them, the transmitting component is configured to be able 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.

[0061] 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 one transmitting 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 transmitting components to separately 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, it can reduce the influence of the synchronization error between the two separate transmitting components on the measurement accuracy of the surface density. On the other hand, in the surface density measuring device of the present application, the path length for the object to be measured to move from the first detection channel to the second detection channel is a fixed value. When determining the position correspondence relationship between the first surface density and the second surface density, it is not necessary to use a length counter for distance measurement, which can reduce the influence of the distance measurement error of the length counter on the measurement accuracy of the surface density. In this way, the surface density measuring device of the present application can effectively improve the measurement accuracy of the surface density.

[0062] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical devices using batteries.

[0063] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical devices.

[0064] 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. For the sake of brevity in description, the following embodiments will be described by taking an electric vehicle as an example.

[0065] Figure 1 The following is a schematic structural diagram of a surface density measurement device provided by some embodiments of the present application. Figure 2 The following is a schematic structural diagram of a ray trajectory formed by the emitting component of the surface density measurement device provided by some embodiments of the present application on the object to be measured.

[0066] Referring to Figures 1 to 2 , embodiments of the present application provide a surface density measurement device 100. The surface density measurement device 100 includes an emitting component 10, a first detector 20, and a second detector 30. The emitting component 10 is configured to emit 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 emitting component 10. The first detector 20 can receive the rays passing 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 for the object to be measured 700 to pass through is formed between the second detector 30 and the emitting component 10. The second detector 30 can receive the rays passing 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. Among them, the emitting component 10 is configured to be able to synchronously emit 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.

[0067] The emitting component 10 can emit rays to the object to be measured 700. After the rays penetrate the object to be measured 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 to be measured 700 by measuring the ray intensities before and after penetrating the object to be measured 700.

[0068] The emitting component 10 may be a ray generator. Exemplarily, the emitting component 10 may be an X-ray generator, a β-ray generator, etc. For different objects to be measured 700, the emitting component 10 can emit different types of rays. As an example, when the object to be measured 700 is a positive electrode sheet, the emitting component 10 can be an X-ray generator and emit X-rays; when the object to be measured 700 is a negative electrode sheet, the emitting component 10 can be a β-ray generator and emit β-rays. The emitting component 10 can also be a laser generator, which can be selected according to the actual application environment.

[0069] The first detector 20 and the second detector 30 can be ionization chambers, which can measure the intensity of ionizing radiation by using the ionization radiation effect of ionizing radiation, that is, the intensity of the ray. The first detector 20 and the second detector 30 have working circuits inside, and can calculate the areal density of the object to be measured 700 according to the intensity of the ray emitted by the emitting component 10 and the intensity of the ray it receives.

[0070] The object to be measured 700 can be the positive electrode sheet, negative electrode sheet of a lithium battery, or other thin-sheet products such as diaphragms and papers.

[0071] 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.

[0072] Exemplarily, under the driving force of a conveying component such as an over-roller or a conveyor belt, the object to be measured 700 can successively pass through the first detection channel 21 and the second detection channel 31 during continuous movement. The areal density measuring device 100 measures the object to be measured 700 located in the first detection channel 21 to obtain the first areal density of the object to be measured 700, and the areal density measuring device 100 measures the object to be measured 700 located in the second detection channel 31 to obtain the second areal density of the object to be measured 700.

[0073] On the one hand, the areal density measuring device 100 of the present application uses one emitting component 10 to synchronously emit 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 emitting components 10 to separately emit 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, it can reduce the influence of the synchronization error between the two separate emitting components 10 on the accuracy of areal density measurement. On the other hand, in the areal 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 position correspondence relationship between the first areal density and the second areal density, it is not necessary to use a counter to measure the distance, which can reduce the influence of the distance measurement error of the counter on the accuracy of areal density measurement. Thus, the areal density measuring device 100 of the present application can effectively improve the accuracy of areal density measurement.

[0074] In some embodiments, the emitting component 10 is arranged to be able to move back and forth along the first direction X, and the first direction X is perpendicular to the conveying direction of the object to be measured 700.

[0075] Exemplarily, the first direction X can be understood as the width direction of the object 700 to be measured, 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, and the rays emitted by the emitting component 10 can perform ray scanning on 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.

[0076] In this way, by arranging the emitting component 10 to move back and forth along the first direction X, the rays emitted by the emitting component 10 can pass through different positions of the object 700 along the first direction X, so as to improve the scanning breadth of the rays of the emitting component 10, and thus can further improve the measurement accuracy of the surface density measuring device 100.

[0077] Optionally, the first detector 20 and the second detector 30 can move synchronously with the emitting component 10 to improve the accuracy of receiving rays.

[0078] In some embodiments, 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, and the first direction X, the second direction Y and the conveying direction are perpendicular to each other in pairs.

[0079] Exemplarily, the second direction Y can be understood as the thickness direction of the object 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 collinear. Furthermore, the rays emitted by the emitting component 10 to the object 700 located in the first detection channel 21 and the rays emitted by the emitting component 10 to the object 700 located in the second detection channel 31 are also collinear, which is beneficial to improving the synchronism between the rays emitted by the emitting component 10 to the object 700 located in the first detection channel 21 and the rays emitted by the emitting component 10 to the object 700 located in the second detection channel 31, and thus can further improve the measurement accuracy of the surface density measuring device 100.

[0080] In some embodiments, the moving speed V1 of the emitting 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 the one-way path H of the emitting component 10 moving back and forth 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.

[0081] Exemplarily, the meaning of the constant coefficient a is the number of one-way paths H during the reciprocating movement of the emitting component 10 when the ray trajectories received by the first detector 20 and the ray trajectories 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. Here, 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. The meaning of L is the path length between the first detector 20 and the second detector 30 of the object under test 700. In other words, L is the path length that the object under test 700 passes through when moving from the first detection channel 21 to the second detection channel 31.

[0082] It should be noted that a one-way 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 one-way path H during the reciprocating movement of the emitting component 10 along the first direction X, and the (1 + a)-th ray trajectory refers to the (1 + a)-th one-way path H during the reciprocating movement of the emitting component 10 along the first direction X.

[0083] By setting the moving speed V1 of the emitting component 10 and the conveying speed V2 of the object under test 700 to satisfy the above mapping relationship, the above technical solution enables the moving speed V1 of the emitting component 10 to be flexibly adjusted according to the conveying speed V2 of the object under test 700, thereby effectively improving the flexibility and applicability of the areal density measurement device 100.

[0084] In some embodiments, the conveying direction of the object under test 700 in the first detection channel 21 is opposite to the conveying direction of the object under test 700 in the second detection channel 31, so that the conveying of the object under test 700 in the areal density measurement device 100 can present a "Z"-shaped tape-running layout, thereby improving the structural compactness.

[0085] In some embodiments, the areal density measurement device 100 further includes a plurality of support rollers 40, and the support rollers 40 are used to support the object under test 700 and guide the movement of the object under test 700. A part of the plurality of support rollers 40 is arranged on two opposite sides of the first detection channel 21 along the third direction Z, and another part of the plurality of support rollers 40 is arranged on two opposite sides of the second detection channel 31 along the third direction Z, and the third direction Z is parallel to the conveying direction of the object under test 700.

[0086] Exemplarily, support rollers 40 are arranged on both sides of the first detection channel 21 facing away from each other in the third direction Z. After the object to be measured 700 enters the first detection channel 21, the support rollers 40 arranged on both sides of the first detection channel 21 facing away from each other in the third direction Z can support the object to be measured 700, thereby reducing the jitter of the object to be measured 700 located in the first detection channel 21; support rollers 40 are arranged on both sides of the second detection channel 31 facing away from each other in the third direction Z. After the object to be measured 700 enters the second detection channel 31, the support rollers 40 arranged on both sides of the second detection channel 31 facing away from each other in the third direction Z can support the object to be measured 700, thereby reducing the jitter of the object to be measured 700 located in the second detection channel 31.

[0087] In this way, the above technical solution can reduce the jitter of the object to be measured 700 during transportation by arranging the support rollers 40, thereby reducing the influence on the areal density measurement caused by the jitter of the object to be measured 700, which is beneficial to improving the measurement accuracy of the areal density measurement device 100.

[0088] In some embodiments, the areal density measurement device 100 further includes a communication component 50. The communication component 50 is communicatively connected to the first detector 20 and the second detector 30. The communication module is used to obtain the areal density information of the first detector 20 and the second detector 30, and send the areal density information to the target device for coating the object to be measured 700.

[0089] Exemplarily, when the object to be measured 700 passes through the first detection channel 21, the first detector 20 receives the ray passing through the object to be measured 700, calculates the areal density of the object to be measured 700 based on the ray intensity emitted by the emitting component 10 and the ray intensity it receives, and generates the first areal density information. The communication module is communicatively connected to the first detector 20 to obtain the first areal density information, and sends the first areal density information to the target device for coating the object to be measured 700; when the object to be measured 700 passes through the second detection channel 31, the second detector 30 receives the ray passing through the object to be measured 700, calculates the areal density of the object to be measured 700 based on the ray intensity emitted by the emitting component 10 and the ray intensity it receives, and generates the second areal density information. The communication module is communicatively connected to the second detector 30 to obtain the second areal density information, and sends the second areal density information to the target device for coating the object to be measured 700. The target device for coating the object to be measured 700 can adjust its own relevant parameters according to the first areal density information and the second areal density information to improve the coating uniformity. Optionally, the target device can be a coating device in the coating system for coating a coating on the surface of the substrate of the electrode sheet.

[0090] Thus, by providing the communication component 50, the surface density measuring device 100 can automatically transmit the surface density information obtained by measuring the object to be measured 700 to the target device for coating the object to be measured 700, which can effectively improve the degree of automation, reduce manual intervention, and is beneficial to cost reduction.

[0091] Figure 3 FIG. is a schematic structural diagram of a coating system provided by some embodiments of the present application.

[0092] Continue to refer to Figure 3 , according to some embodiments of the present application, the present application also provides a coating system, which includes an unwinding device 200, a coating device 300, a winding device 400, and the surface density measuring device 100 of any of the above solutions. The unwinding device 200 is used to provide a strip 800. The coating device 300 is used to coat a coating on the surface of the strip 800. The winding device 400 is used to wind the strip 800 coated with the coating. The strip 800 passes through the first detection channel 21 and the 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.

[0093] Exemplarily, in the coating system, the strip 800 provided by the unwinding device 200 may be the substrate of the electrode sheet. Under the driving force of conveying components such as rollers or conveyor belts, the strip 800 first passes through the first detection channel 21 of the surface density measuring device 100, and 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 conveyed to the coating device 300, and the coating device 300 coats a coating on the surface of the strip 800. The strip 800 coated with the coating continues to be conveyed to the second detection channel 31 of the surface density measuring device 100, and the surface density measuring device 100 measures the strip 800 coated with the coating located in the second detection channel 31 to obtain the surface density of the strip 800 after coating. The difference between the surface density of the strip 800 after coating and the surface density of the strip 800 before coating is the net surface density of the coating. According to the net surface density of the coating, the relevant parameters of the coating device 300 are adjusted in real time, thereby improving the overall quality of electrode sheet coating.

[0094] Thus, the above coating system measures the areal density of the strip 800 before coating and the areal density of the strip 800 after coating by using the areal density measuring device 100 of the present application, and then obtains the net areal density of the coating by using the difference between the two. On the one hand, an emitting component 10 synchronously emits 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 emit rays to the strip 800 located in the first detection channel 21 and the strip 800 located in the second detection channel 31 respectively, it can reduce the influence of the synchronization error between the two separate emitting components 10 on the accuracy of areal density measurement. On the other hand, in the areal 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 position correspondence between the areal density of the strip 800 before coating and the areal density of the strip 800 after coating, it is not necessary to use a length counter for distance measurement, which can reduce the influence of the distance measurement error of the length counter on the accuracy of areal density measurement. Thus, the accuracy of areal density measurement can be effectively improved, thereby improving the overall coating quality of the coating system.

[0095] In some embodiments, the coating system further includes a drying device 500, and along the strip running direction, the drying device 500 is located downstream of the coating device 300.

[0096] Exemplarily, the drying device 500 is located downstream of the coating device 300. After the coating device 300 coats a coating on the surface of the strip 800, the strip 800 coated with the coating continues to be conveyed to the drying device 500, and the drying device 500 can dry the coating to improve the stability of the coating, so that the coating is not easily peeled off from the substrate.

[0097] In some embodiments, along the strip running direction, the drying device 500 is also located upstream of the second detection channel 31.

[0098] Exemplarily, under the driving force of conveying components such as over-rollers or conveyor belts, the strip material 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 material 800 located in the first detection channel 21 to obtain the areal density of the strip material 800 before coating. Then, the strip material 800 continues to be conveyed to the coating device 300. The coating device 300 coats a coating on the surface of the strip material 800. The strip material 800 coated with the coating continues to be conveyed to the drying device 500. The drying device 500 dries the coating to obtain a dry film coating. The strip material 800 coated with the dry film coating continues to be conveyed to the second detection channel 31 of the areal density measuring device 100. The areal density measuring device 100 measures the strip material 800 coated with the dry film coating located in the second detection channel 31 to obtain the areal density of the strip material 800 after coating. The difference between the areal density of the strip material 800 after coating and the areal density of the strip material 800 before coating is the net areal density of the dry film coating. According to the net areal density of the dry film coating, the relevant parameters of the coating device 300 are adjusted in real time, thereby improving the overall quality of the pole piece coating.

[0099] In the above technical solution, by arranging the drying device 500 upstream of the second detection channel 31, after the strip material 800 is coated by the coating device 300 and dried by the drying device 500, it then passes through the second detection channel 31 of the areal density measuring device 100 for areal density measurement. The stability of the dry film coating is relatively high, so that the areal density measurement error can be further reduced. The effect of adjusting the relevant parameters of the coating device 300 in real time according to the net areal density of the dry film coating is better, which is beneficial to further improving the overall quality of the pole piece coating.

[0100] Figure 4 The structure diagram of another coating system provided by some embodiments of the present application.

[0101] Continue to refer to Figure 4 In some embodiments, two coating devices 300 are provided. The two coating devices 300 are arranged along the strip running direction. One of the two coating devices 300 is used to coat a coating on one surface of the strip material 800, and the other of the two coating devices 300 is used to coat a coating on the other surface of the strip 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.

[0102] Exemplarily, to more clearly illustrate the embodiments of the present application, the two coating devices 300 are respectively configured as a first coating device 300a and a second coating device 300b, and the two areal density measuring devices 100 are respectively configured as a first areal density measuring device 100a and a second areal density measuring device 100b for illustration.

[0103] 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 face away from each other along the thickness direction of the strip 800. The first detection channel 21 of the first surface density measuring device 100a is located upstream of the first coating device 300a, and the second detection channel 31 of the first surface density measuring device 100a is located downstream of the first coating device 300a. The first detection channel 21 of the second surface density measuring device 100b is located upstream of the second coating device 300b, and the second detection channel 31 of the second surface density measuring device 100b is located downstream of the second coating device 300b.

[0104] Under the driving force 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 strip 800 surface density of the strip 800 before coating. The initial strip 800 surface density can be understood as the surface density of the substrate of the electrode sheet. Then, the strip 800 continues to be conveyed to the first coating device 300a. The first coating device 300a coats the first surface of the strip 800 with the first coating. The strip 800 coated with the first coating continues to be conveyed 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 strip 800 surface density of the strip 800 after the first coating is coated. The first strip 800 surface density can be understood as the total surface density of the substrate and the first coating. Among them, the difference between the above-mentioned first strip 800 surface density and the above-mentioned initial strip 800 surface density is the net surface density of the first coating.

[0105] Next, the strip 800 coated with the first coating continues to be conveyed 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 to obtain the areal density of the second strip 800, and the areal density of the second strip 800 can be understood as the total areal density of the substrate and the first coating. Then, the strip 800 coated with the first coating continues to be conveyed to the second coating device 300b, and the second coating device 300b coats the second coating on the second surface of the strip 800. The strip 800 coated with the first coating and the second coating continues to be conveyed 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 and the second coating to obtain the areal density of the third strip 800 after the second coating is coated, and the areal density of the third strip 800 can be understood as the total areal density of the substrate, the first coating, and the second coating. Among them, the difference between the areal density of the third strip 800 and the areal density of the second strip 800 is the net areal density of the second coating.

[0106] 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 embodiments both refer to the total areal density of the substrate and the first coating. Since the strip 800 will pass through mechanism components such as idler rollers or swing rollers during the process of being conveyed 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 to obtain the areal density of the second strip 800, and uses the areal density of the second strip 800 and the areal density of the third strip 800 to calculate the net areal density of the second coating, which can filter out the movement errors generated when the strip 800 passes through mechanism components such as idler rollers or swing rollers, thereby improving the overall accuracy of areal density measurement.

[0107] The above technical solution can enable the coating system to perform double-sided coating of the strip 800 on a single production line by setting two coating devices and two areal density measuring devices 100, thereby improving the coating efficiency of the coating system.

[0108] In some embodiments, the coating system further includes two drying devices 500, and the two drying devices 500 are correspondingly arranged with the two coating devices 300. Along the strip running direction, the drying device 500 is located downstream of the coating device 300.

[0109] Exemplarily, to more clearly illustrate the embodiments of the present application, the two drying devices 500 are respectively configured as a first drying device 500a and a second drying device 500b for illustration.

[0110] 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 surface density measuring device 100a and upstream of the first detection channel 21 of the second surface density measuring device 100b. The second drying device 500b is located downstream of the second detection channel 31 of the second surface density measuring device 100b.

[0111] Under the driving force of a conveying component such as a passing roller or a conveyor belt, the strip material 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 material 800 to obtain the initial strip material 800 surface density of the strip material 800 before coating. The initial strip material 800 surface density can be understood as the surface density of the substrate of the electrode sheet. Then, the strip material 800 continues to be conveyed to the first coating device 300a. The first coating device 300a coats a first coating on the first surface of the strip material 800. The strip material 800 coated with the first coating continues to be conveyed to the second detection channel 31 of the first surface density measuring device 100a. The first surface density measuring device 100a measures the strip material 800 coated with the first coating to obtain the first strip material 800 surface density of the strip material 800 after the first coating is coated. The first strip material 800 surface density can be understood as the total surface density of the substrate and the first coating. Among them, the difference between the above-mentioned first strip material 800 surface density and the above-mentioned initial strip material 800 surface density is the net surface density of the first coating.

[0112] Next, the strip 800 coated with the first coating continues to be conveyed to the first drying device 500a, and the first drying device 500a dries the first coating to obtain the first dry film coating. The strip 800 coated with the first dry film coating continues to be conveyed to the first detection channel 21 of the second areal density measuring device 100b, and the second areal density measuring device 100b measures the strip 800 coated with the first dry film coating to obtain the areal density of the second strip 800. The areal density of the second strip 800 can be understood as the total areal density of the substrate and the first dry film coating. Then, the strip 800 coated with the first dry film coating continues to be conveyed to the second coating device 300b, and the second coating device 300b coats the second coating on the second surface of the strip 800. The strip 800 coated with the first dry film coating and the second coating continues to be conveyed to the second detection channel 31 of the second areal density measuring device 100b, and the second areal density measuring device 100b measures the strip 800 coated with the first dry film coating and the second coating to obtain the areal density of the third strip 800 of the strip 800 after the second coating is coated. The areal density of the third strip 800 can be understood as the total areal density of the substrate, the first dry film coating and the second coating. Among them, the difference between the areal density of the third strip 800 and the areal density of the second strip 800 is the net areal density of the second coating.

[0113] Next, the strip 800 coated with the first dry film coating and the second coating continues to be conveyed to the second drying device 500b, and the second drying device 500b dries the second coating to obtain the second dry film coating. Then, the strip 800 coated with the first dry film coating and the second dry film coating continues to be conveyed to the winding device 400 for winding.

[0114] Through the above technical solution, by setting two drying devices 500, on the one hand, the coating drying of the strip 800 can be further realized on a production line by the coating system, thereby further improving the coating efficiency of the coating system. On the other hand, after the first coating is dried to obtain the first dry film coating, the coating work of the second coating and the measurement work of the second areal density measuring device 100b are carried out. The stability of the first dry film coating is relatively high, so that the measurement error of the subsequent second areal density measuring device 100b and the coating difficulty of the second coating device can be further reduced, which is beneficial to further improving the overall quality of the electrode coating.

[0115] Optionally, the first drying device 500a can also 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. The second drying device 500b can also 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. It can be selected according to the actual application environment and will not be elaborated here.

[0116] In some embodiments, the coating system further includes a detection device 600, which is used to measure the areal density of the strip 800 with both surfaces coated with a coating dried by the drying device 500.

[0117] Exemplarily, after the strip 800 coated with the first dry film coating and the second dry film coating passes through the detection device 600, it 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 areal density of the fourth strip 800, which 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 pole piece coating is completed.

[0118] In the above technical solution, by setting the detection device 600, the overall areal density of the pole piece after coating can be measured as data for monitoring the coating quality of the pole piece, which is beneficial to improving the reliability of the coating system.

[0119] Optionally, the detection device 600 can be an X-ray areal density measuring instrument, a β-ray areal density measuring instrument, or a laser-ray integrated microspot areal density measuring instrument commonly used in the current market, etc.

[0120] In some embodiments, the detection device 600 is configured as the areal density measuring device 100 provided in the embodiments of the present application, which can improve the consistency of the entire coating system.

[0121] To better understand the areal density measuring device 100 provided in the embodiments of the present application, based on the same inventive concept, embodiments of the above areal density measuring device 100 in practical applications are provided here for illustration.

[0122] The embodiments of the present application provide an areal density measuring device 100, which includes a transmitting component 10, a first detector 20, a second detector 30, and a plurality of support rollers 40. The transmitting component 10 is used to emit rays to the object to be measured 700, and the transmitting component 10 is arranged 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 to be measured 700. 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.

[0123] 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 can receive the 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 emitting component 10. The second detector 30 can receive the 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. Wherein, the emitting component 10 is configured to be able to synchronously emit 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. 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, the second direction Y and the conveying direction are perpendicular to each other in pairs. The first detector 20 and the second detector 30 move synchronously with the emitting component 10. The conveying direction of the object to be measured 700 in the first detection channel 21 is opposite to the conveying direction of the object to be measured 700 in the second detection channel 31.

[0124] The supporting rollers 40 are used to support the object to be measured 700 and guide the movement of the object to be measured 700. A part of the supporting rollers 40 among the plurality of supporting rollers 40 are arranged on both sides of the first detection channel 21 along the third direction Z opposite to each other, and another part of the supporting rollers 40 among the plurality of supporting rollers 40 are arranged on both sides of the second detection channel 31 along the third direction Z opposite to each other. The third direction Z is parallel to the conveying direction of the object to be measured 700.

[0125] According to some embodiments of the present application, the present application further provides a coating system. The coating system includes an unwinding device 200, a coating device 300, a winding device 400 and the areal density measuring device 100 of any of the above solutions. The unwinding device 200 is used to provide a strip 800. The coating device 300 is used to coat a coating on the surface of the strip 800. The winding device 400 is used to wind the strip 800 coated with the coating. The strip 800 passes through the first detection channel 21 and the 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.

[0126] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0127] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by 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 measuring device, characterized in that, comprising: a transmitting component for emitting rays to the object to be measured; a first detector, forming a first detection channel for the object to be measured to pass through between the first detector and the transmitting component, the first detector being capable of receiving the 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 detector, forming a second detection channel for the object to be measured to pass through between the second detector and the transmitting component, the second detector being capable of receiving the 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 emit the rays to the object to be measured entering the first detection channel and the object to be measured entering the second detection channel.

2. The surface density measuring device according to claim 1, characterized in that, 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, characterized in that, the first detector and the second detector are respectively arranged on both sides of the transmitting component along a second direction, and the first direction, the second direction and the conveying direction are perpendicular to each other in pairs.

4. The surface density measuring device according to claim 2, characterized in that, the moving speed V1 of the transmitting 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 transmitting component moving back and forth along the first direction, and L is the path length of the object to be measured between the first detector and the second detector.

5. The surface density measuring device according to any one of claims 1-4, characterized in that, 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 1-5, characterized in that, the surface density measuring device further comprises a plurality of support rollers for supporting the object to be measured and guiding the movement of the object to be measured; a part of the plurality of support rollers are arranged on both sides of the first detection channel along a third direction away from each other, and another part of the plurality of support rollers are arranged on both sides of the second detection channel along the third direction away from each other, and the third direction is parallel to the conveying direction of the object to be measured.

7. The surface density measuring device according to any one of claims 1-6, characterized in that, the surface density measuring device further comprises a communication component, the communication component is communicatively connected to the first detector and the second detector, and the communication module is used to obtain the surface density information of the first detector and the second detector and send the surface density information to the target device for coating the object to be measured.

8. The surface density measuring device according to any one of claims 1-7, characterized in that, the transmitting component includes at least one of an X-ray generator, a β-ray generator and a laser generator.

9. A coating system, characterized in that, it includes: an unwinding device for providing a strip material; a coating device for coating a coating on the surface of the strip material; a winding device for winding the strip material coated with the coating; the areal density measuring device according to any one of claims 1-8, the strip material passes through the first detection channel and the second detection channel, along the running direction of the strip material, 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, characterized in that, the coating system further includes a drying device, along the running direction, the drying device is located downstream of the coating device.

11. The coating system according to claim 10, characterized in that, along the running direction, the drying device is also located upstream of the second detection channel.

12. The coating system according to claim 9, characterized in that, the coating device is provided with two, the two coating devices are arranged along the running direction, one of the two coating devices is used for coating the coating on one surface of the strip material, and the other of the two coating devices is used for coating the coating on the other surface of the strip material; the areal density measuring device is two, and the two areal density measuring devices are respectively arranged corresponding to the two coating devices.

13. The coating system according to claim 12, characterized in that, the coating system further includes two drying devices, the two drying devices are arranged corresponding to the two coating devices, along the running direction, the drying device is located downstream of the coating device.

14. The coating system according to claim 13, characterized in that, the coating system further includes a detection device, and the detection device is used for measuring the areal density of the strip material with the coating dried by the drying device coated on both surfaces.

15. The coating system according to claim 14, characterized in that, the detection device is configured as the areal density measuring device.

Images