Ultrasonic laser measuring instrument and surface density compensation method of pole piece

Abstract

The present application relates to the technical field of lithium battery production detection, especially to an ultrasonic laser measuring instrument and a surface density compensation method of an electrode sheet, which comprises a conveying assembly, a base, a driving assembly, a movable frame and a measuring module; the conveying assembly comprises a roller seat and a conveying roller; the movable frame is arranged on the conveying roller and is in transmission connection with the driving assembly; the measuring module comprises an ultrasonic probe group, a laser probe group, an ultrasonic calibration element and a laser calibration element; the functional modules work cooperatively to ensure accuracy and reliability, avoid the radioactive hazard of the traditional ray measurement method, and make the measurement safety greatly improved without special protection measures; through the double data fusion of the ultrasonic direct measurement and the laser thickness compensation, the error caused by the change of material density in the single laser measurement method is effectively overcome, and the data reliability is improved; the accurate measurement in the dry film and wet film states can be realized, and the application range is expanded.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production and testing technology, and in particular to an ultrasonic laser measuring instrument and a method for compensating the areal density of electrodes. Background Technology

[0002] In the manufacturing process of lithium-ion battery electrodes, areal density is one of the key parameters affecting battery performance. Currently, the areal density detection of electrodes in the coating process mainly relies on X-ray measurement and laser thickness measurement. However, existing X-ray measurement equipment used for electrode measurement poses radioactive safety hazards, requiring additional protective measures, increasing equipment costs and maintenance difficulty. Furthermore, X-ray measurement equipment cannot measure wet films, limiting its measurement range; laser measurement relies on theoretical assumptions about material density, and fluctuations in the density of the actual coating slurry can lead to measurement errors, only measuring the total thickness, affecting the accuracy of areal density calculation; and existing coating areal density measurement equipment cannot accurately measure the wet coating film. Summary of the Invention

[0003] The purpose of this invention is to provide an ultrasonic laser measuring instrument and a method for compensating the surface density of electrodes, so as to solve the technical problem that the surface density detection of electrodes in the existing coating process mainly relies on X-ray measurement and laser thickness measurement, but these methods have significant technical limitations.

[0004] In a first aspect, the present invention provides an ultrasonic laser measuring instrument, comprising: a conveying component, a base, a driving component, a movable frame, and a measuring module;

[0005] The conveying assembly includes a roller seat and a conveying roller for conveying electrode sheets. The roller seat is disposed on the base, and the conveying roller is disposed on the roller seat.

[0006] The drive assembly is mounted on the base, the movable frame is mounted on the axial side of the conveying roller and is connected to the drive assembly in a transmission manner, and the movable frame is provided with a clearance notch at one end facing the conveying roller to avoid the electrode sheet. The drive assembly is used to drive the movable frame to reciprocate along the axial direction of the conveying roller so that the movable frame extends into and out of the conveying path of the electrode sheet on the conveying roller.

[0007] The measurement module includes an ultrasonic probe group, a laser probe group, an ultrasonic calibration component, and a laser calibration component. The ultrasonic probe group and the laser probe group are both located at the end of the movable frame facing the conveyor roller. The ultrasonic calibration component and the laser calibration component are both located on the roller seat and are respectively matched and cooperate with the ultrasonic probe group and the laser probe group.

[0008] In an optional embodiment, the ultrasonic probe group and the laser probe group are located on a first straight line and are spaced apart, the first straight line being parallel to the conveying path of the electrode on the conveying roller.

[0009] In an optional implementation, both the drive assembly and the movable frame are provided in pairs and connected in a one-to-one transmission manner;

[0010] The ultrasonic probe group and the laser probe group are respectively mounted on the two movable frames.

[0011] In an optional embodiment, the ultrasonic probe group and the laser probe group are located on a second straight line and spaced apart, the second straight line being parallel to the axis of the conveyor roller.

[0012] In an optional implementation, two drive components and two movable frames are provided, and they are connected in a one-to-one transmission connection; two measurement modules are provided.

[0013] The ultrasonic probe group and the laser probe group in the two measurement modules are respectively mounted on the two movable frames.

[0014] In an optional embodiment, the drive assembly includes a linear guide, a motor, a coupling, a ball screw, a guide mount, and a limiting structure.

[0015] The linear guide rail is mounted on the base and extends along the axial direction of the conveying roller. The motor is connected to the ball screw via the coupling. The movable frame is connected to the slider of the linear guide rail via the guide rail mounting seat, and the guide rail mounting seat is connected to the nut seat of the ball screw.

[0016] The limiting structure is disposed on the base and is used to limit the driving stroke of the driving component.

[0017] In an optional embodiment, the roller seat includes a front column, a rear column, and a mounting base, and the conveying roller includes two main rollers and two auxiliary rollers.

[0018] The front column and the rear column are disposed opposite each other on the top of the base, and the movable frame is disposed on the side of the rear column away from the front column.

[0019] The two ends of the two main rollers are respectively disposed on the front column and the rear column, and the gap between the two main rollers corresponds to the movable frame;

[0020] The two auxiliary rollers are mounted on the side of the base via the mounting seat, with one auxiliary roller located in front of the two main rollers and the other auxiliary roller located in the rear of the two main rollers.

[0021] In an optional embodiment, the base is provided with lifting rings for hoisting.

[0022] Secondly, the present invention provides a method for compensating the areal density of an electrode, implemented using the ultrasonic laser measuring instrument described in any of the foregoing embodiments, the compensation method comprising the following steps:

[0023] Obtain compensation data, which includes: the measured areal density of the electrode, the areal density measurement calibration coefficient, the measured thickness of the electrode, and the thickness measurement calibration coefficient;

[0024] The density after compensation is obtained based on the compensation data and the standard thickness benchmark value of the electrode.

[0025] In an optional implementation, the step of obtaining compensation data includes: driving a movable frame through a driving component to drive an ultrasonic probe group and a laser probe group located on a first straight line and spaced apart to synchronously scan the electrode and obtain the measured areal density and measured thickness of the electrode respectively.

[0026] The steps for obtaining the post-compensation density based on compensation data and the standard thickness reference value of the electrode include: determining the post-compensation density using the following formula:

[0027] ;

[0028] in: ρ c To compensate for the density later, ρ u For the measured areal density, h l For the actual measured thickness, h 0 is the standard thickness reference value. k This is the coupling coefficient between the areal density measurement calibration coefficient and the thickness measurement calibration coefficient.

[0029] In an optional implementation, the step of acquiring compensation data includes: driving two movable frames through two driving components to drive the ultrasonic probe group and the laser probe group to scan the electrode sheet in parallel and synchronously, and acquiring the real-time measured areal density and real-time measured thickness of the electrode sheet respectively; the compensation data also includes the real-time signal-to-noise ratio; the step of acquiring the compensation back density based on the compensation data and the standard thickness reference value of the electrode sheet includes: determining the real-time compensation back density using the following formula:

[0030] ;

[0031] The compensated back density of the signal-to-noise ratio weighted fusion is determined using the following formula:

[0032] ;

[0033] or;

[0034] The compensation data also includes the predicted thickness at the current point; the steps for obtaining the compensation data include: driving two movable frames through two drive components to alternately and asynchronously scan the electrode sheet using ultrasonic probe groups and laser probe groups respectively, and obtaining the measured areal density and measured thickness of the electrode sheet respectively; constructing a Kalman filter model based on historical measured thicknesses to obtain the predicted thickness at the current point; the steps for obtaining the density after compensation based on the compensation data and the standard thickness benchmark value of the electrode sheet include: determining the density after compensation using the following formula:

[0035] ;

[0036] in: ρ c To compensate for the density later, ρ u For the measured areal density, h´ l Predict the thickness for the current point. h 0 is the standard thickness reference value. k This is the coupling coefficient between the areal density measurement calibration coefficient and the thickness measurement calibration coefficient. ρ ci To compensate for the density in real time, ρ ui To measure areal density in real time, h l To measure the thickness in real time, SNR i This represents the real-time signal-to-noise ratio.

[0037] In an optional implementation, the step of obtaining compensation data includes: using a driving component to drive a movable frame to asynchronously scan the electrode sheet with an ultrasonic probe group and a laser probe group located on a second straight line and spaced apart, and respectively obtain the measured areal density and the measured thickness of the electrode sheet.

[0038] The compensation data also includes the state of the electrode, the slurry leveling coefficient, the velocity gradient influence factor, the predicted thickness at the current point, the distance between the ultrasonic probe group and the laser probe group on the second straight line, the movement speed of the movable frame, and the time.

[0039] The steps for obtaining the post-compensation density based on compensation data and the standard thickness reference value of the electrode include: determining the asynchronous scanning delay time of the ultrasonic probe group and the laser probe group using the following formula:

[0040] ;

[0041] When the electrode is in the state of a dry film, the predicted thickness at the current point is determined by the following formula:

[0042] ;

[0043] When the electrode is in the state of a wet film, the predicted thickness at the current point is determined by the following formula:

[0044] ;

[0045] The density behind the compensation layer is determined using the following formula:

[0046] ;

[0047] in: Δt The asynchronous scanning delay time for the ultrasonic probe group and the laser probe group. L The distance between the ultrasonic probe group and the laser probe group on the second straight line. v Let t be the velocity and t be the time. ρ c To compensate for the density later, ρ u For the measured areal density, h l For the actual measured thickness, h 0 is the standard thickness reference value. h´ l Predict the thickness for the current point. β 0 represents the calibration coefficient for areal density measurement. β 1 represents the thickness measurement calibration coefficient. λ The leveling coefficient of the slurry. γ This represents the influence factor of the velocity gradient.

[0048] In an optional implementation, the step of acquiring compensation data includes: driving two movable frames via two drive components to respectively drive the ultrasonic probe group and laser probe group in a measurement module to scan the electrode in parallel and acquire the real-time measured areal density and real-time measured thickness of the electrode; the compensation data also includes the compensation data weighting coefficients acquired by the first measurement module and the compensation data weighting coefficients acquired by the second measurement module; the step of acquiring the compensated areal density based on the compensation data and the standard thickness reference value of the electrode includes: determining the areal density based on the first measurement module using the following formula. i The compensation data obtained by the measurement module is the first one. i Density following each compensation:

[0049] ;

[0050] The final density after compensation is determined using the following formula:

[0051] ;

[0052] or;

[0053] The compensation data also includes the measured thickness estimate and the secondary compensation coefficient; the steps for obtaining the compensation data include: driving two movable frames through two drive components to alternately scan the electrode sheet with the ultrasonic probe group and the laser probe group in a measurement module, and obtaining the real-time measured areal density and the real-time measured thickness of the electrode sheet respectively; generating the measured thickness estimate based on historical measured thickness interpolation; the steps for obtaining the compensated areal density based on the compensation data and the standard thickness reference value of the electrode sheet include: determining the areal density based on the following formula... i The compensation data obtained by the measurement module is the first one. i Density following each compensation:

[0054] ;

[0055] The final density after compensation is determined using the following formula:

[0056] ;

[0057] in: ρ final To ultimately compensate for the density later, ρ ci For the first i The compensation data obtained by the measurement module is the first one. i The density following the compensation, ρ ui For the first i The measured surface density of each measurement module h´ li For the first i The current point predicted thickness of each measurement module. ω A The weighting coefficients for the compensation data obtained by the first measurement module. ω B The weighting coefficients for the compensation data obtained by the second measurement module. This is an estimated value based on the measured thickness. β This is the secondary compensation coefficient.

[0058] Compared with the prior art, the technical advantages of the ultrasonic laser measuring instrument and electrode surface density compensation method provided by the present invention are as follows:

[0059] The ultrasonic laser measuring instrument provided by this invention includes: a conveying assembly, a base, a driving assembly, a movable frame, and a measuring module; the conveying assembly includes a roller seat and a conveying roller for conveying electrodes, the roller seat being disposed on the base, and the conveying roller being disposed on the roller seat; the driving assembly is disposed on the base, the movable frame is disposed on the axial side of the conveying roller and is connected to the driving assembly for transmission, the end of the movable frame facing the conveying roller is provided with a clearance notch for avoiding electrodes, and the driving assembly is used to drive the movable frame to reciprocate along the axial direction of the conveying roller, so that the movable frame extends into and exits the conveying path of the electrodes on the conveying roller; the measuring module includes an ultrasonic probe group, a laser probe group, an ultrasonic calibration component, and a laser calibration component, the ultrasonic probe group and the laser probe group are both disposed on the end of the movable frame facing the conveying roller, the ultrasonic calibration component and the laser calibration component are both disposed on the roller seat and respectively cooperate with the ultrasonic probe group and the laser probe group.

[0060] The base serves as the foundation platform for the measuring instrument, providing a stable support benchmark for the entire instrument. The conveyor assembly ensures the smoothness of the electrode transport process. The drive assembly provides stable power for the reciprocating motion of the movable frame. The high-precision measurement module, composed of ultrasonic probes, laser probes, ultrasonic calibration components, and laser calibration components, constitutes the core measurement system of the instrument. These functional modules work collaboratively to ensure the accuracy and reliability of the measuring instrument, completely avoiding the radioactive hazards of traditional X-ray measurement methods. No special protective measures are required, greatly improving measurement safety. Furthermore, the dual data fusion of direct ultrasonic measurement and laser thickness compensation effectively overcomes the errors caused by material density variations in single laser measurement methods, improving data reliability. Simultaneously, it overcomes the limitations of traditional methods on the measurement environment, enabling accurate measurements in both dry and wet film conditions, expanding its applicability.

[0061] The electrode surface density compensation method provided by this invention is implemented using the aforementioned ultrasonic laser measuring instrument. Therefore, the technical advantages and effects achieved include those achieved by the aforementioned ultrasonic laser measuring instrument, which will not be elaborated here.

[0062] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0063] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0064] Figure 1 This is a schematic diagram of the overall structure of the measuring instrument provided in an embodiment of the present invention;

[0065] Figure 2 A schematic diagram of the base and conveying assembly structure provided in an embodiment of the present invention;

[0066] Figure 3 This is a schematic diagram of the structure of the drive component mounted on the base according to an embodiment of the present invention;

[0067] Figure 4 This is a schematic diagram of the structure of the drive component connecting the movable frame provided in an embodiment of the present invention;

[0068] Figure 5 This is a schematic diagram of the installation of the ultrasonic probe group and the laser probe group in the measurement module provided in an embodiment of the present invention;

[0069] Figure 6 This is a schematic diagram showing the installation of the ultrasonic calibration component and the laser calibration component in the measurement module provided in an embodiment of the present invention;

[0070] Figure 7 This is a schematic diagram of the structure of a second embodiment provided by the present invention;

[0071] Figure 8 This is a schematic diagram of the third embodiment of the present invention.

[0072] Figure 9 This is a schematic diagram of the fourth embodiment of the present invention.

[0073] Icons: 1-Base; 2-Mountain; 3-Electrode; 4-Ultrasonic probe assembly; 5-Laser probe assembly; 6-Ultrasonic calibration component; 7-Laser calibration component; 8-Linear guide rail; 9-Motor; 10-Coupling; 11-Ball screw; 12-Guide rail mounting base; 13-Slider; 14-Nut seat; 15-Front column; 16-Rear column; 17-Mounting base; 18-Main roller; 19-Auxiliary roller; 20-Lifting ring; 21-Photoelectric sensor; 22-Anti-collision block; 23-Drag chain; 24-Circuit board. Detailed Implementation

[0074] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0077] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0078] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0079] The specific structure is as follows: Figures 1 to 9 As shown.

[0080] This embodiment provides an ultrasonic laser measuring instrument, including: a conveying assembly, a base 1, a driving assembly, a movable frame 2, and a measuring module; the conveying assembly includes a roller seat and a conveying roller for conveying electrode 3, the roller seat is disposed on the base 1, and the conveying roller is disposed on the roller seat; the driving assembly is disposed on the base 1, the movable frame 2 is disposed on the axial side of the conveying roller and is connected to the driving assembly for transmission, the end of the movable frame 2 facing the conveying roller is provided with a clearance notch for avoiding the electrode 3, the driving assembly is used to drive the movable frame 2 to reciprocate along the axial direction of the conveying roller, so that the movable frame 2 extends into and exits the conveying path of the electrode 3 on the conveying roller; the measuring module includes an ultrasonic probe group 4, a laser probe group 5, an ultrasonic calibration component 6, and a laser calibration component 7, the ultrasonic probe group 4 and the laser probe group 5 are both disposed on the end of the movable frame 2 facing the conveying roller, the ultrasonic calibration component 6 and the laser calibration component 7 are both disposed on the roller seat and respectively cooperate with the ultrasonic probe group 4 and the laser probe group 5.

[0081] Specifically, base 1 serves as the basic platform for the measuring instrument, providing a stable support benchmark for the entire instrument; the conveyor assembly ensures the smoothness of the electrode 3's conveyor belt movement; the drive assembly provides stable power for the reciprocating motion of the movable frame 2; the high-precision measurement module, composed of ultrasonic probe group 4, laser probe group 5, ultrasonic calibration component 6, and laser calibration component 7, constitutes the core measurement system of the measuring instrument. These functional modules work collaboratively to ensure the accuracy and reliability of the measuring instrument, completely avoiding the radioactive hazards of traditional X-ray measurement methods. No special protective measures are required, greatly improving measurement safety. Furthermore, the dual data fusion of direct ultrasonic measurement and laser thickness compensation effectively overcomes the errors caused by material density variations in single laser measurement methods, improving data reliability. Simultaneously, it breaks through the limitations of traditional methods on the measurement environment, enabling accurate measurement in both dry and wet film conditions, expanding its applicability.

[0082] In this preferred embodiment, the base 1 is made of marble to reduce vibration during the operation of the measuring instrument.

[0083] In the optional technical solutions of this embodiment, such as Figure 1 As shown in the first embodiment, the ultrasonic probe group 4 and the laser probe group 5 are located on a first straight line and spaced apart, the first straight line being parallel to the conveying path of the electrode 3 on the conveying roller. A drive assembly drives a movable frame 2 to move the ultrasonic probe group 4 and the laser probe group 5, enabling the movable frame 2 to scan the electrode 3 synchronously when extending into and exiting the conveying path of the electrode 3 on the conveying roller, i.e., scanning the same position at the same time node, with no time difference. This achieves synchronous acquisition of dual parameters in a single scan, and the measurement delay caused by the distance between the ultrasonic probe group 4 and the laser probe group 5 is eliminated through a space-time registration algorithm.

[0084] In the optional technical solutions of this embodiment, such as Figure 8 As shown in the third embodiment, two drive components and two movable frames 2 are provided, and they are connected one-to-one in a transmission manner; the ultrasonic probe group 4 and the laser probe group 5 are respectively mounted on the two movable frames 2. The two drive components drive the two movable frames 2 to move the ultrasonic probe group 4 and the laser probe group 5 respectively, so that the ultrasonic probe group 4 and the laser probe group 5 can follow the movable frames 2 to perform parallel synchronous (no time difference) scanning measurement or alternating asynchronous (with time difference) scanning measurement on the electrode 3 to obtain the real-time areal density data of the electrode 3 material.

[0085] In the optional technical solutions of this embodiment, such as Figure 7As shown in the second embodiment, the ultrasonic probe group 4 and the laser probe group 5 are located on a second straight line and spaced apart, the second straight line being parallel to the axis of the conveyor roller. A drive assembly drives a movable frame 2 to move the ultrasonic probe group 4 and the laser probe group 5, allowing the movable frame 2 to asynchronously scan the electrode 3 as it extends into and exits the conveyor roller's path, meaning the scanning positions differ at the same time point, resulting in a time difference. The electrode 3 is then measured to obtain real-time areal density data of the electrode 3 material.

[0086] In the optional technical solutions of this embodiment, such as Figure 9 As shown, in the fourth embodiment, two drive components and two movable frames 2 are provided, each connected in a one-to-one transmission manner, and two measurement modules are provided. The ultrasonic probe group 4 and the laser probe group 5 in the two measurement modules are respectively mounted on the two movable frames 2. The two drive components drive the two movable frames 2 to move one measurement module, so that the ultrasonic probe group 4 and the laser probe group 5 in the two measurement modules can follow the movable frames 2 to perform parallel scanning measurements on the electrode 3 (the two movable frames 2 move synchronously without time difference, but the ultrasonic probe group 4 and the laser probe group 5 on the movable frames 2 are located on the second straight line and are spaced apart, so there is a time difference) or alternating scanning measurements (the two movable frames 2 move alternately with time difference, and the ultrasonic probe group 4 and the laser probe group 5 on the movable frames 2 are located on the second straight line and are spaced apart, so there is also a time difference) to obtain the real-time areal density data of the electrode 3 material. At this time, the ultrasonic probe group 4 and the laser probe group 5 in each measurement module are located on the second straight line and are spaced apart, and the second straight line is parallel to the axis of the conveyor roller.

[0087] In the optional technical solution of this embodiment, the driving component includes a linear guide rail 8, a motor 9, a coupling 10, a ball screw 11, a guide rail mounting seat 12, and a limiting structure; the linear guide rail 8 is disposed on the base 1 and extends along the axial direction of the conveying roller; the motor 9 is connected to the ball screw 11 via the coupling 10; the movable frame 2 is connected to the slider 13 of the linear guide rail 8 via the guide rail mounting seat 12, and the guide rail mounting seat 12 is connected to the nut seat 14 of the ball screw 11; the limiting structure is disposed on the base 1 and is used to limit the driving stroke of the driving component.

[0088] Specifically, motor 9 is connected to ball screw 11 via coupling 10. Nut seat 14 on ball screw 11 is connected to guide rail mounting base 12. Movable frame 2 is fixed to the upper surface of guide rail mounting base 12, and its lower surface is connected to linear guide rail 8 via slider 13. An external power source drives motor 9 to rotate, enabling the drive assembly to achieve the required precise reciprocating linear motion. The structure is simple, and the drive is stable.

[0089] In this embodiment, the limiting structure includes a photoelectric sensor 21 and / or a collision avoidance block 22; preferably, the photoelectric sensor 21 and the collision avoidance block 22 are provided simultaneously to improve the limiting effect. A photoelectric switch sensor is installed next to the linear guide rail 8, and the photoelectric sensor 21 limits the stroke of the moving parts. A collision avoidance block 22 is installed below the ball screw 11 to prevent mechanical runaway from damaging the drive components. The collision avoidance block 22 is made of polyurethane, but it is not limited to this; other materials can also be used, as long as they meet the requirements.

[0090] In this embodiment, the linear guide rails 8 can be set in any number as needed.

[0091] In the optional technical solution of this embodiment, the roller seat includes a front column 15, a rear column 16, and a mounting base 17. The conveying roller includes two main rollers 18 and two auxiliary rollers 19. The front column 15 and the rear column 16 are arranged opposite to each other on the top of the base 1, and the movable frame 2 is arranged on the side of the rear column 16 away from the front column 15. The two ends of the two main rollers 18 are respectively arranged on the front column 15 and the rear column 16, and the gap between the two main rollers 18 corresponds to the movable frame 2. The two auxiliary rollers 19 are arranged on the side of the base 1 through the mounting base 17, and one auxiliary roller 19 is located in front of the two main rollers 18, and the other auxiliary roller 19 is located in rear of the two main rollers 18.

[0092] Specifically, two main rollers 18 are mounted on the upper surface of the base 1 via front column 15 and rear column 16, and the two main rollers 18 are kept parallel and horizontal to each other. Two auxiliary rollers 19 are fixed to the two sides of the base 1 via mounting base 17. Four conveying rollers provide support for the electrode 3, ensuring that the electrode 3 is stable during conveying.

[0093] In this embodiment, the front column 15 can be integrally formed, and one of the two main rollers 18 is set accordingly; or it can be made separately, and one of the main rollers 18 is set accordingly; the rear column 16 is the same, and will not be described in detail here.

[0094] In this preferred embodiment, the movable frame 2 is C-shaped, but it is not limited to this and can be other shapes to meet the requirements. The ultrasonic probe assembly 4 and the laser probe assembly 5 are both mounted on the movable frame 2, and the ultrasonic calibration component 6 and the laser calibration component 7 are fixed to the front column 15. The movable frame 2 is hollow inside, and the circuit board 24 is installed inside the movable frame 2. The power cord and signal cable are connected to the outside through the interior of the movable frame 2 and the cable chain 23.

[0095] In the optional technical solution of this embodiment, the base 1 is provided with lifting rings 20 for hoisting. The number of lifting rings 20 can be any number, as long as the hoisting requirements are met.

[0096] In this preferred embodiment, four lifting rings 20 are provided, and the four lifting rings 20 are installed on the side of the base 1 to facilitate the hoisting of the measuring instrument.

[0097] This embodiment provides a method for compensating the surface density of an electrode 3, which is implemented using the aforementioned ultrasonic laser measuring instrument. Therefore, the technical advantages and effects achieved by this method for compensating the surface density of the electrode 3 include those achieved by the aforementioned ultrasonic laser measuring instrument, which will not be elaborated here.

[0098] The compensation method includes the following steps:

[0099] Acquire compensation data, which includes: the measured areal density of electrode 3, the areal density measurement calibration coefficient, the measured thickness of electrode 3, and the thickness measurement calibration coefficient; obtain the compensated areal density based on the compensation data and the standard thickness reference value of electrode 3.

[0100] In this embodiment, the electrode material 3 on the conveying roller is reciprocated by ultrasonic probe group 4 and laser probe group 5 to obtain the surface density monitoring data, i.e., compensation data, of the electrode 3. The data is fed back to the coating closed-loop system. If the data deviates from the set value, the coating closed-loop system sends a corresponding adjustment command to the coating die head to change the coating surface density and ensure that the coating surface density meets the set value.

[0101] In the optional technical solutions of this embodiment, such as Figure 1 As shown, the steps for obtaining compensation data include: driving a movable frame 2 via a driving component to simultaneously scan the electrode 3 with the ultrasonic probe group 4 and laser probe group 5 located on the first straight line and spaced apart, and obtaining the measured areal density and measured thickness of the electrode 3 respectively; the steps for obtaining the post-compensation density based on the compensation data and the standard thickness reference value of the electrode 3 include: determining the post-compensation density using the following formula: ;in: ρ c To compensate for the density later, ρ u For the measured areal density, h l For the actual measured thickness, h 0 is the standard thickness reference value. k This is the coupling coefficient between the areal density measurement calibration coefficient and the thickness measurement calibration coefficient. It enables simultaneous acquisition of both parameters in a single scan and eliminates measurement delay caused by probe spacing through a space-time registration algorithm.

[0102] In the optional technical solutions of this embodiment, such as Figure 8As shown, the steps for obtaining compensation data include: driving two movable frames 2 through two drive components to drive the ultrasonic probe group 4 and the laser probe group 5 to scan the electrode 3 in parallel and synchronously, and obtaining the real-time measured areal density and real-time measured thickness of the electrode 3 respectively; the compensation data also includes the real-time signal-to-noise ratio; the steps for obtaining the compensation back density based on the compensation data and the standard thickness reference value of the electrode 3 include: determining the real-time compensation back density using the following formula: The compensated back density for signal-to-noise ratio weighted fusion is determined using the following formula: ; or ; the compensation data also includes the current point predicted thickness; the steps to obtain the compensation data include: driving two movable frames 2 through two driving components to alternately and asynchronously scan the electrode 3 with the ultrasonic probe group 4 and the laser probe group 5 respectively, and obtaining the measured areal density and measured thickness of the electrode 3 respectively; constructing a Kalman filter model based on the historical measured thickness to obtain the current point predicted thickness; the steps to obtain the compensation back density based on the compensation data and the standard thickness reference value of the electrode 3 include: determining the compensation back density using the following formula: ;in: ρ c To compensate for the density later, ρ u For the measured areal density, h´ l Predict the thickness for the current point. h 0 is the standard thickness reference value. k This is the coupling coefficient between the areal density measurement calibration coefficient and the thickness measurement calibration coefficient. ρ ci To compensate for the density in real time, ρ ui To measure areal density in real time, h l To measure the thickness in real time, SNR i For real-time signal-to-noise ratio, compensation is implemented in two modes: parallel scanning and alternating scanning. Through dual-mode differential compensation and dynamic weight allocation, the data coordination problem of two independent motion systems is solved, transforming the independent motion system into a precision advantage.

[0103] In the optional technical solutions of this embodiment, such as Figure 7As shown, the steps for obtaining compensation data include: using a drive component to drive a movable frame 2 to asynchronously scan the electrode 3 with ultrasonic probe group 4 and laser probe group 5 located on a second straight line and spaced apart, and obtaining the measured areal density and measured thickness of the electrode 3 respectively; the compensation data also includes the state of the electrode 3, slurry leveling coefficient, velocity gradient influence factor, predicted thickness at the current point, the distance between ultrasonic probe group 4 and laser probe group 5 on the second straight line, the movement speed of the movable frame 2, and time; the steps for obtaining the compensated areal density based on the compensation data and the standard thickness reference value of the electrode 3 include: determining the asynchronous scanning delay time of ultrasonic probe group 4 and laser probe group 5 using the following formula: When electrode 3 is in the state of a dry film, the predicted thickness at the current point is determined by the following formula: When electrode 3 is in the state of a wet film, the predicted thickness at the current point is determined by the following formula: The density behind the compensation layer is determined using the following formula: ;in: Δt The asynchronous scanning delay time for ultrasonic probe group 4 and laser probe group 5. L The distance between the ultrasonic probe group 4 and the laser probe group 5 on the second straight line. v Let t be the velocity and t be the time. ρ c To compensate for the density later, ρ u For the measured areal density, h l For the actual measured thickness, h 0 is the standard thickness reference value. h´ l Predict the thickness for the current point. β 0 represents the calibration coefficient for areal density measurement. β 1 represents the thickness measurement calibration coefficient. λ The leveling coefficient of the slurry. γ This represents the velocity gradient influence factor. This scheme addresses the systematic errors caused by probe spacing through spatiotemporal dynamic mapping and adaptive compensation based on material state, offering significant advantages, especially in dynamic coating scenarios.

[0104] In the optional technical solutions of this embodiment, such as Figure 9 As shown, the steps for obtaining compensation data include: driving two movable frames 2 through two drive components to drive the ultrasonic probe group 4 and laser probe group 5 in a measurement module to scan the electrode 3 in parallel and obtain the real-time measured areal density and real-time measured thickness of the electrode 3 respectively; the compensation data also includes the compensation data weighting coefficients obtained by the first measurement module and the compensation data weighting coefficients obtained by the second measurement module; the step of obtaining the compensated areal density based on the compensation data and the standard thickness reference value of the electrode 3 includes: determining the areal density based on the first measurement module using the following formula.i The compensation data obtained by the measurement module is the first one. i Density following each compensation: The final density after compensation is determined using the following formula: ; or ; the compensation data also includes the measured thickness estimate and the secondary compensation coefficient; the steps to obtain the compensation data include: driving two movable frames 2 through two driving components to drive the ultrasonic probe group 4 and laser probe group 5 in a measurement module to alternately scan the electrode 3 and obtain the real-time measured areal density and real-time measured thickness of the electrode 3 respectively, and generating the measured thickness estimate based on historical measured thickness interpolation; the steps to obtain the compensated areal density based on the compensation data and the standard thickness reference value of the electrode 3 include: determining the areal density based on the following formula i The compensation data obtained by the measurement module is the first one. i Density following each compensation: The final density after compensation is determined using the following formula: ;in: ρ final To ultimately compensate for the density later, ρ ci For the first i The compensation data obtained by the measurement module is the first one. i The density following the compensation, ρ ui For the first i The measured surface density of each measurement module h´ li For the first i The current point predicted thickness of each measurement module. ω A The weighting coefficients for the compensation data obtained by the first measurement module. ω B The weighting coefficients for the compensation data obtained by the second measurement module. This is an estimated value based on the measured thickness. β This is the secondary compensation coefficient. This scheme simplifies complex working conditions through graded compensation design and modular processing, achieving accurate measurement of material surface density.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 invention.

Claims

1. An ultrasonic laser measuring instrument, characterized in that, include: Conveying assembly, base (1), drive assembly, movable frame (2), and measuring module; The conveying assembly includes a roller seat and a conveying roller for conveying the electrode sheet (3), the roller seat being disposed on the base (1), and the conveying roller being disposed on the roller seat; The drive assembly is disposed on the base (1), the movable frame (2) is disposed on the axial side of the conveying roller and is connected to the drive assembly in a transmission manner, the movable frame (2) is provided with a clearance notch for avoiding the electrode (3) at one end facing the conveying roller, and the drive assembly is used to drive the movable frame (2) to reciprocate along the axial direction of the conveying roller so that the movable frame (2) extends into and exits the conveying path of the electrode (3) on the conveying roller; The measurement module includes an ultrasonic probe group (4), a laser probe group (5), an ultrasonic calibration component (6), and a laser calibration component (7). The ultrasonic probe group (4) and the laser probe group (5) are both located at one end of the movable frame (2) facing the conveyor roller. The ultrasonic calibration component (6) and the laser calibration component (7) are both located on the roller seat and are respectively matched with the ultrasonic probe group (4) and the laser probe group (5). The ultrasonic probe group (4) and the laser probe group (5) are used to reciprocate scan the electrode material (3) on the conveying roller to obtain compensation data of the electrode (3). The compensation data includes: the measured areal density of the electrode (3), the areal density measurement calibration coefficient, the measured thickness of the electrode (3), and the thickness measurement calibration coefficient. The compensation is obtained based on the compensation data and the standard thickness reference value of the electrode (3).

2. The ultrasonic laser measuring instrument according to claim 1, characterized in that, The ultrasonic probe group (4) and the laser probe group (5) are located on a first straight line and are spaced apart. The first straight line is parallel to the conveying path of the electrode plate (3) on the conveying roller.

3. The ultrasonic laser measuring instrument according to claim 1, characterized in that, The drive assembly and the movable frame (2) are each provided with two corresponding transmission connections; The ultrasonic probe group (4) and the laser probe group (5) are respectively mounted on the two movable frames (2).

4. The ultrasonic laser measuring instrument according to claim 1, characterized in that, The ultrasonic probe group (4) and the laser probe group (5) are located on a second straight line and are spaced apart, the second straight line being parallel to the axis of the conveying roller.

5. The ultrasonic laser measuring instrument according to claim 4, characterized in that, The drive assembly and the movable frame (2) are each provided in two and are connected in a one-to-one transmission manner; the measuring module is provided in two. The ultrasonic probe group (4) and the laser probe group (5) in the two measurement modules are respectively mounted on the two movable frames (2).

6. The ultrasonic laser measuring instrument according to any one of claims 1-5, characterized in that, The drive assembly includes a linear guide rail (8), a motor (9), a coupling (10), a ball screw (11), a guide rail mounting base (12), and a limiting structure; The linear guide (8) is mounted on the base (1) and extends along the axial direction of the conveying roller. The motor (9) is connected to the ball screw (11) via the coupling (10). The movable frame (2) is connected to the slider (13) of the linear guide (8) via the guide rail mounting seat (12), and the guide rail mounting seat (12) is connected to the nut seat (14) of the ball screw (11). The limiting structure is disposed on the base (1) and is used to limit the driving stroke of the driving component.

7. The ultrasonic laser measuring instrument according to any one of claims 1-5, characterized in that, The roller seat includes a front column (15), a rear column (16) and a mounting base (17), and the conveying roller includes two main rollers (18) and two auxiliary rollers (19). The front column (15) and the rear column (16) are disposed opposite to each other on the top of the base (1), and the movable frame (2) is disposed on the side of the rear column (16) away from the front column (15). The two ends of the two main rollers (18) are respectively set on the front column (15) and the rear column (16), and the gap between the two main rollers (18) corresponds to the movable frame (2); Two auxiliary rollers (19) are mounted on the side of the base (1) via the mounting seat (17), with one auxiliary roller (19) located in front of the two main rollers (18) and the other auxiliary roller (19) located in the rear of the two main rollers (18).

8. The ultrasonic laser measuring instrument according to any one of claims 1-5, characterized in that, The base (1) is provided with a lifting ring (20) for hoisting.

9. A method for compensating the areal density of an electrode, characterized in that, Implemented using the ultrasonic laser measuring instrument according to any one of claims 1-8, the compensation method includes the following steps: Obtain compensation data, which includes: the measured areal density of the electrode (3), the areal density measurement calibration coefficient, the measured thickness of the electrode (3), and the thickness measurement calibration coefficient; The density after compensation is obtained based on the compensation data and the standard thickness reference value of the electrode (3).

10. The method for compensating the areal density of an electrode according to claim 9, characterized in that, The steps for obtaining compensation data include: driving a movable frame (2) through a driving component to drive an ultrasonic probe group (4) and a laser probe group (5) located on the first straight line and spaced apart to synchronously scan the electrode (3) and obtain the measured surface density and measured thickness of the electrode (3) respectively; The steps for obtaining the density after compensation based on the compensation data and the standard thickness reference value of the electrode (3) include: determining the density after compensation using the following formula: ； in: ρ c To compensate for the density later, ρ u For the measured areal density, h l For the actual measured thickness, h 0 is the standard thickness reference value. k This is the coupling coefficient between the areal density measurement calibration coefficient and the thickness measurement calibration coefficient.

11. The method for compensating the areal density of an electrode according to claim 9, characterized in that, The steps for obtaining compensation data include: driving two movable frames (2) through two drive components to drive the ultrasonic probe group (4) and the laser probe group (5) to scan the electrode (3) in parallel and synchronously, and obtaining the real-time measured areal density and real-time measured thickness of the electrode (3); the compensation data also includes the real-time signal-to-noise ratio; the steps for obtaining the compensation back density based on the compensation data and the standard thickness reference value of the electrode (3) include: determining the real-time compensation back density using the following formula: ； The compensated back density of the signal-to-noise ratio weighted fusion is determined using the following formula: ； or; The compensation data also includes the current point predicted thickness; the steps to obtain the compensation data include: driving two movable frames (2) through two driving components to drive the ultrasonic probe group (4) and the laser probe group (5) to alternately and asynchronously scan the electrode (3) and obtain the measured areal density and measured thickness of the electrode (3) respectively, and constructing a Kalman filter model based on the historical measured thickness to obtain the current point predicted thickness; the steps to obtain the compensation back density based on the compensation data and the standard thickness reference value of the electrode (3) include: determining the compensation back density through the following formula: ； in: ρ c To compensate for the density later, ρ u For the measured areal density, h´ l Predict the thickness for the current point. h 0 is the standard thickness reference value. k This is the coupling coefficient between the areal density measurement calibration coefficient and the thickness measurement calibration coefficient. ρ ci To compensate for the density in real time, ρ ui To measure areal density in real time, h l To measure the thickness in real time, SNR i This represents the real-time signal-to-noise ratio.

12. The method for compensating the areal density of an electrode according to claim 9, characterized in that, The steps for obtaining compensation data include: driving a movable frame (2) through a driving component to drive an ultrasonic probe group (4) and a laser probe group (5) located on the second straight line and spaced apart to asynchronously scan the electrode (3) and obtain the measured surface density and measured thickness of the electrode (3) respectively; The compensation data also includes the state of the electrode (3), the slurry leveling coefficient, the velocity gradient influence factor, the current point predicted thickness, the distance between the ultrasonic probe group (4) and the laser probe group (5) on the second straight line, the movement speed of the movable frame (2), and the time. The steps for obtaining the post-compensation density based on the compensation data and the standard thickness reference value of the electrode (3) include: determining the asynchronous scanning delay time of the ultrasonic probe group (4) and the laser probe group (5) using the following formula: ； When the electrode (3) is in the state of a dry film, the predicted thickness at the current point is determined by the following formula: ； When the electrode (3) is in the state of a wet film, the predicted thickness at the current point is determined by the following formula: ； The density behind the compensation layer is determined using the following formula: ； in: Δt The asynchronous scanning delay time for the ultrasonic probe group (4) and the laser probe group (5) is given. L The distance between the ultrasonic probe group (4) and the laser probe group (5) on the second straight line. v For speed, t For time, ρ c To compensate for the density later, ρ u For the measured areal density, h l For the actual measured thickness, h 0 is the standard thickness reference value. h´ l Predict the thickness for the current point. β 0 represents the calibration coefficient for areal density measurement. β 1 represents the thickness measurement calibration coefficient. λ The leveling coefficient of the slurry. γ This represents the influence factor of the velocity gradient.

13. The method for compensating the areal density of an electrode according to claim 12, characterized in that, The steps for obtaining compensation data include: driving two movable frames (2) through two drive components to drive the ultrasonic probe group (4) and laser probe group (5) in a measurement module to scan the electrode (3) in parallel and obtain the real-time measured areal density and real-time measured thickness of the electrode (3) respectively; the compensation data also includes the compensation data weighting coefficient obtained by the first measurement module and the compensation data weighting coefficient obtained by the second measurement module; the steps for obtaining the compensation areal density based on the compensation data and the standard thickness reference value of the electrode (3) include: determining the compensation areal density based on the first measurement module using the following formula. i The compensation data obtained by the measurement module is the first one. i Density following each compensation: ； The final density after compensation is determined using the following formula: ； or; The compensation data also includes the measured thickness estimate and the secondary compensation coefficient; the steps to obtain the compensation data include: driving two movable frames (2) through two driving components to drive the ultrasonic probe group (4) and laser probe group (5) in a measurement module to alternately scan the electrode (3) and obtain the real-time measured areal density and real-time measured thickness of the electrode (3) respectively, and generating the measured thickness estimate based on historical measured thickness interpolation; the steps to obtain the compensated areal density based on the compensation data and the standard thickness reference value of the electrode (3) include: determining the areal density based on the following formula. i The compensation data obtained by the measurement module is the first one. i Density following each compensation: ； The final density after compensation is determined using the following formula: ； in: ρ final To ultimately compensate for the density later, ρ ci For the first i The compensation data obtained by the measurement module is the first one. i The density following the compensation, ρ ui For the first i The measured surface density of each measurement module h´ li For the first i The current point predicted thickness of each measurement module. ω A The weighting coefficients for the compensation data obtained by the first measurement module. ω B The weighting coefficients for the compensation data obtained by the second measurement module. This is an estimated value based on the measured thickness. β This is the secondary compensation coefficient.

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