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

Abstract

The invention relates to the technical field of lithium battery production and detection, in particular to an ultrasonic laser measuring instrument and a surface density compensation method of a pole piece. The ultrasonic laser measuring instrument provided by the invention 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 set, a laser probe set, an ultrasonic calibration piece and a laser calibration piece. All the function modules work cooperatively to jointly guarantee accuracy and reliability, radioactive hazards of a traditional ray measurement method are avoided, special protection measures are not needed, the measurement safety is greatly improved, and through double data fusion of ultrasonic direct measurement and laser thickness compensation, the measurement accuracy is greatly improved. Errors caused by material density changes in a single laser measurement method are effectively overcome, and the data reliability is improved. Accurate measurement in a dry film state and a wet film state can be realized, and the application range is expanded.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery production detection, and in particular to an ultrasonic laser measuring instrument and a surface density compensation method for a pole piece. BACKGROUND

[0002] In the manufacturing process of a lithium battery pole piece, the surface density is one of the key parameters affecting the performance of the battery. At present, the surface density detection of the pole piece in the coating process mainly relies on the ray measurement method and the laser thickness measurement method. However, the existing ray measurement equipment for pole piece measurement has radioactive safety hazards, and additional protection measures are required, which increases the cost and maintenance difficulty of the equipment. Moreover, the ray measurement equipment cannot measure the wet film, and the measurement range has limitations; the laser measurement method relies on the theoretical assumption of material density, and the density fluctuation of the actual coating slurry will cause measurement error, and only the total thickness can be measured, which affects the calculation accuracy of the surface density; and the existing coating surface density measurement equipment cannot accurately measure the coating wet film. SUMMARY

[0003] The purpose of the present application is to provide an ultrasonic laser measuring instrument and a surface density compensation method for a pole piece, in order to solve the technical problem that the existing surface density detection of the pole piece in the coating process mainly relies on the ray measurement method and the laser thickness measurement method, but these methods have significant technical limitations.

[0004] In a first aspect, the present application provides an ultrasonic laser measuring instrument, comprising: 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 for conveying the pole piece, the roller seat is arranged on the base, and the conveying roller is arranged on the roller seat; The driving assembly is arranged on the base, the movable frame is arranged on the axial side of the conveying roller and is in transmission connection with the driving assembly, one end of the movable frame towards the conveying roller is provided with an avoiding notch for avoiding the pole piece, 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 pole piece on the conveying roller; The measuring module comprises an ultrasonic probe group, a laser probe group, an ultrasonic calibration piece and a laser calibration piece, the ultrasonic probe group and the laser probe group are both arranged at one end of the movable frame towards the conveying roller, the ultrasonic calibration piece and the laser calibration piece are both arranged on the roller seat, and are respectively matched with the ultrasonic probe group and the laser probe group.

[0005] In an optional embodiment, the ultrasonic probe group and the laser probe group are located on a first straight line and are arranged at intervals, and the first straight line is parallel to the conveying path of the pole piece on the conveying roller.

[0006] In an optional embodiment, the driving assembly and the movable frame are provided with two one-to-one transmission connections respectively. The ultrasonic probe group and the laser probe group are arranged on the two movable frames respectively.

[0007] In an optional embodiment, the ultrasonic probe group and the laser probe group are arranged on a second straight line and are spaced apart, and the second straight line is parallel to the axis of the conveying roller.

[0008] In an optional embodiment, the driving assembly and the movable frame are provided with two one-to-one transmission connections respectively, and the measuring module is provided with two. The ultrasonic probe group and the laser probe group in the two measuring modules are arranged on the two movable frames respectively.

[0009] In an optional embodiment, the driving assembly comprises a linear guide rail, a motor, a coupling, a ball screw, a guide rail mounting seat and a limiting structure. The linear guide rail is arranged on the base and extends along the axis of the conveying roller, the motor is in transmission connection with the ball screw through the coupling, the movable frame is connected to the sliding block of the linear guide rail through the guide rail mounting seat, and the guide rail mounting seat is connected to the nut seat of the ball screw. The limiting structure is arranged on the base and is used for limiting the driving stroke of the driving assembly.

[0010] In an optional embodiment, the roller seat comprises a front stand, a rear stand and a mounting seat, and the conveying roller comprises two main rollers and two auxiliary rollers. The front stand and the rear stand are arranged opposite to each other on the top of the base, and the movable frame is arranged on the side of the rear stand away from the front stand. The two ends of the two main rollers are arranged on the front stand and the rear stand respectively, and the gap between the two main rollers corresponds to the movable frame. The two auxiliary rollers are arranged on the side of the base through the mounting seat, and one of the auxiliary rollers is located in front of the two main rollers, and the other auxiliary roller is located behind the two main rollers.

[0011] In an optional embodiment, the base is provided with a lifting ring for lifting.

[0012] In a second aspect, the application provides a surface density compensation method for a pole piece, which is implemented by using the ultrasonic laser measuring instrument according to any one of the preceding embodiments, and the compensation method comprises the following steps: obtaining compensation data, wherein the compensation data comprises: the measured surface density of the pole piece, the surface density measurement calibration coefficient, the measured thickness of the pole piece and the thickness measurement calibration coefficient; The compensated surface density is obtained based on the compensation data and a standard thickness reference value of the pole piece.

[0013] In an optional embodiment, the step of obtaining the compensation data comprises: driving the ultrasonic probe group and the laser probe group on the first straight line and arranged at intervals to synchronously scan the pole piece by a driving assembly driving a movable frame, and obtaining the measured surface density of the pole piece and the measured thickness of the pole piece respectively. The step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece comprises: determining the compensated surface density by the following formula: ; Wherein: p c is the compensated surface density, p u is the measured surface density, h l is the measured thickness, h 0 is the standard thickness reference value, k is the coupling coefficient of the surface density measurement calibration coefficient and the thickness measurement calibration coefficient.

[0014] In an optional embodiment, the step of obtaining the compensation data comprises: driving the ultrasonic probe group and the laser probe group in parallel and synchronously to scan the pole piece by two driving assemblies driving two movable frames respectively, and obtaining the real-time measured surface density of the pole piece and the real-time measured thickness of the pole piece respectively; the compensation data further comprises a real-time signal-to-noise ratio; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece comprises: determining the real-time compensated surface density by the following formula: ; The compensated surface density fused according to the signal-to-noise ratio is determined by the following formula: ; Or; The compensation data further comprises a current point predicted thickness; the step of obtaining the compensation data comprises: driving the ultrasonic probe group and the laser probe group to alternately and asynchronously scan the pole piece by two driving assemblies driving two movable frames respectively, and obtaining the measured surface density of the pole piece and the measured thickness of the pole piece respectively, and constructing a Kalman filter model based on the historical measured thickness to obtain the current point predicted thickness; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece comprises: determining the compensated surface density by the following formula: ; Wherein: p c is the compensated surface density, p u is the measured surface density, h´ lthe current point predicted thickness, h 0 is the standard thickness reference value, k is a coupling coefficient of the area density measurement calibration coefficient and the thickness measurement calibration coefficient, p ci is the real-time compensated area density, p ui is the real-time measured area density, h l is the real-time measured thickness, SNR i is the real-time signal-to-noise ratio.

[0015] In an optional embodiment, the step of acquiring compensation data comprises: driving an active frame by a driving assembly to drive the ultrasonic probe group and the laser probe group located on the second straight line and arranged at intervals to asynchronously scan the pole piece and acquire the measured area density of the pole piece and the measured thickness of the pole piece, respectively; The compensation data further comprises the state of the pole piece, the slurry flow leveling coefficient, the velocity gradient influence factor, the current point predicted thickness, the interval of the ultrasonic probe group and the laser probe group on the second straight line, the movement speed of the active frame, and the time; The step of acquiring the compensated area density based on the compensation data and the standard thickness reference value of the pole piece comprises: determining the ultrasonic probe group and the laser probe group asynchronous scanning delay time by the following formula: When the state of the pole piece is a dry film, the current point predicted thickness is determined by the following formula: When the state of the pole piece is a wet film, the current point predicted thickness is determined by the following formula: The compensated area density is determined by the following formula: Wherein: Δt is the ultrasonic probe group and the laser probe group asynchronous scanning delay time, L is the interval of the ultrasonic probe group and the laser probe group on the second straight line, v is the velocity, and t is the time, p c is the compensated area density, p u is the measured area density, h l is the measured thickness, h 0 is the standard thickness reference value, h´ l is the current point predicted thickness, β 0 is the area density measurement calibration coefficient,​​​​β 1 is a thickness measurement calibration coefficient, l is a slurry flow leveling coefficient, g is a velocity gradient influence factor.

[0016] In an optional embodiment, the step of obtaining compensation data comprises: driving the two movable frames by the two driving assemblies to respectively drive the ultrasonic probe group and the laser probe group in one measurement module to scan the pole piece in parallel and respectively obtain the real-time measured surface density of the pole piece and the real-time measured thickness of the pole piece; the compensation data further comprises a compensation data weight coefficient obtained by the first measurement module and a compensation data weight coefficient obtained by the second measurement module; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece comprises: determining the first compensated surface density obtained by the compensation data obtained by the first measurement module by the following formula: i i ; determining the final compensated surface density by the following formula: ; or; The compensation data further comprises a measured thickness estimation value and a secondary compensation coefficient; the step of obtaining the compensation data comprises: driving the two movable frames by the two driving assemblies to respectively drive the ultrasonic probe group and the laser probe group in one measurement module to alternately scan the pole piece and respectively obtain the real-time measured surface density of the pole piece and the real-time measured thickness of the pole piece, and generating the measured thickness estimation value based on the historical measured thickness interpolation; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece comprises: determining the first compensated surface density obtained by the compensation data obtained by the first measurement module by the following formula: i i ; determining the final compensated surface density by the following formula: ; wherein: p final is the final compensated surface density, p ci is the first compensated surface density obtained by the compensation data obtained by the first measurement module, i i p ui is the measured surface density based on the first measurement module, i h´ li is the current point prediction thickness based on the first measurement module, i w ​​​​​​​​A a compensation data weight coefficient for the first measurement module, w B a compensation data weight coefficient for the second measurement module, a measured thickness estimation value, β a secondary compensation coefficient.

[0017] Compared with the prior art, the ultrasonic laser measuring instrument and the surface density compensation method for pole pieces provided by the application have the following technical advantages: The ultrasonic laser measuring instrument provided by the application comprises a conveying assembly, a base, a driving assembly, a movable frame and a measurement module. The conveying assembly comprises a roller seat and conveying rollers for conveying pole pieces. The roller seat is arranged on the base, and the conveying rollers are arranged on the roller seat. The driving assembly is arranged on the base. The movable frame is arranged on the axial side of the conveying rollers and is in transmission connection with the driving assembly. An avoiding gap for avoiding the pole pieces is arranged at one end of the movable frame facing the conveying rollers. The driving assembly is used to drive the movable frame to reciprocate along the axial direction of the conveying rollers, so that the movable frame extends into and exits the conveying path of the pole pieces on the conveying rollers. The measurement module comprises an ultrasonic probe group, a laser probe group, an ultrasonic calibration piece and a laser calibration piece. The ultrasonic probe group and the laser probe group are both arranged at one end of the movable frame facing the conveying rollers. The ultrasonic calibration piece and the laser calibration piece are both arranged on the roller seat and correspondingly matched with the ultrasonic probe group and the laser probe group.

[0018] The base serves as the basic platform of the measuring instrument and provides a stable support reference for the whole measuring instrument. The conveying assembly ensures the stability of the pole pieces during the conveying process. The driving assembly provides stable power for the reciprocating movement of the movable frame. The high-precision measurement module composed of the ultrasonic probe group, the laser probe group, the ultrasonic calibration piece and the laser calibration piece constitutes the core measurement system of the measuring instrument. The various functional modules work cooperatively to jointly ensure the accuracy and reliability of the measuring instrument. The radioactive hazard of the traditional ray measurement method is completely avoided, and special protection measures are not needed, so that the measurement safety is greatly improved. Through the double data fusion of the direct ultrasonic measurement and the laser thickness compensation, the error caused by the change of the material density in the single laser measurement method is effectively overcome, and the data reliability is improved. At the same time, the traditional method is broken through to limit the measurement environment, and accurate measurement in the dry film and wet film states can be realized, thereby expanding the application range.

[0019] The surface density compensation method for pole pieces provided by the application is implemented by using the above-mentioned ultrasonic laser measuring instrument. Therefore, the technical advantages and effects achieved by the method include those achieved by the above-mentioned ultrasonic laser measuring instrument, which will not be described in detail here.

[0020] Other features and advantages of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 The overall structure schematic diagram of the measuring instrument provided by the embodiment of the present application is shown in the figure. Figure 2 The structure schematic diagram of the base and conveying assembly provided by the embodiment of the present application is shown in the figure. Figure 3 The structure schematic diagram of the driving assembly installed on the base provided by the embodiment of the present application is shown in the figure. Figure 4 The structure schematic diagram of the driving assembly connected to the movable frame provided by the embodiment of the present application is shown in the figure. Figure 5 The installation schematic diagram of the ultrasonic probe group and the laser probe group in the measuring module provided by the embodiment of the present application is shown in the figure. Figure 6 The installation schematic diagram of the ultrasonic calibration element and the laser calibration element in the measuring module provided by the embodiment of the present application is shown in the figure. Figure 7 The structure schematic diagram of the second embodiment provided by the embodiment of the present application is shown in the figure. Figure 8 The structure schematic diagram of the third embodiment provided by the embodiment of the present application is shown in the figure. Figure 9 The structure schematic diagram of the fourth embodiment provided by the embodiment of the present application is shown in the figure.

[0023] Figure legend: 1-base; 2-movable frame; 3-pole piece; 4-ultrasonic probe group; 5-laser probe group; 6-ultrasonic calibration element; 7-laser calibration element; 8-linear guide rail; 9-motor; 10-coupling; 11-ball screw; 12-guide rail mounting seat; 13-sliding block; 14-nut seat; 15-front upright column; 16-rear upright column; 17-mounting seat; 18-main roller; 19-auxiliary roller; 20-suspender; 21-optoelectronic sensor; 22-anti-collision block; 23-tow chain; 24-circuit board. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0028] The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0029] The specific structure is as shown in Figures 1 to 9 .

[0030] The present embodiment provides an ultrasonic laser measuring instrument, comprising: a conveying assembly, a base 1, a driving assembly, a movable frame 2 and a measuring module; the conveying assembly comprises a roller seat and a conveying roller for conveying a pole piece 3, the roller seat is arranged on the base 1, and the conveying roller is arranged on the roller seat; the driving assembly is arranged on the base 1, the movable frame 2 is arranged on the axial side of the conveying roller and is in transmission connection with the driving assembly, one end of the movable frame 2 towards the conveying roller is provided with a avoiding gap for avoiding the pole piece 3, and the driving assembly is used for driving 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 pole piece 3 on the conveying roller; the measuring module comprises an ultrasonic probe group 4, a laser probe group 5, an ultrasonic calibration piece 6 and a laser calibration piece 7, the ultrasonic probe group 4 and the laser probe group 5 are both arranged at one end of the movable frame 2 towards the conveying roller, the ultrasonic calibration piece 6 and the laser calibration piece 7 are both arranged on the roller seat, and correspondingly matched with the ultrasonic probe group 4 and the laser probe group 5 respectively.

[0031] Specifically, the base 1 serves as a basic platform of the measuring instrument, providing a stable support reference for the whole measuring instrument; the conveying assembly ensures the stability of the movement of the pole piece 3; the driving assembly provides stable power for the reciprocating movement of the movable frame 2; the high-precision measuring module composed of the ultrasonic probe group 4, the laser probe group 5, the ultrasonic calibration piece 6 and the laser calibration piece 7 constitutes the core measuring system of the measuring instrument, and the various functional modules work together to ensure the accuracy and reliability of the measuring instrument, completely avoiding the radioactive hazards of the traditional ray measurement method, without the need for special protection measures, greatly improving the measurement safety, and through the double data fusion of ultrasonic direct measurement and laser thickness compensation, effectively overcoming the errors caused by the change of material density in single laser measurement, improving the data reliability. At the same time, it breaks through the limitation of the traditional method on the measurement environment, and can realize accurate measurement in dry film and wet film states, expanding the application range.

[0032] In the preferred embodiment of the present embodiment, the base 1 is made of marble to reduce vibration during operation of the measuring instrument.

[0033] In the optional technical solution of the present embodiment, as shown in Figure 1 , it is the first implementation, the ultrasonic probe group 4 and the laser probe group 5 are located on the first straight line and are spaced apart, and the first straight line is parallel to the conveying path of the pole piece 3 on the conveying roller. One driving assembly drives one movable frame 2 to drive the ultrasonic probe group 4 and the laser probe group 5 to move, so that the movable frame 2 can synchronously scan the pole piece 3 when it extends into and exits the conveying path of the pole piece 3 on the conveying roller, that is, the same position is scanned at the same time node, and there is no time difference. It realizes the synchronous acquisition of double parameters in single scanning, and eliminates the measurement delay caused by the distance between the ultrasonic probe group 4 and the laser probe group 5 through a space-time registration algorithm.

[0034] In the optional technical solution of the present embodiment, as shown in Figure 8 , it is the third implementation, the driving assembly and the movable frame 2 are both provided with two and are one-to-one transmission connection; the ultrasonic probe group 4 and the laser probe group 5 are respectively arranged on the two movable frames 2. Two driving assemblies drive two movable frames 2 to drive the ultrasonic probe group 4 and the laser probe group 5 to move, so that the ultrasonic probe group 4 and the laser probe group 5 can follow the movable frame 2 to make parallel synchronous (no time difference) scanning measurement or alternating asynchronous (with time difference) scanning measurement on the pole piece 3 to obtain real-time surface density data of the pole piece 3 material.

[0035] In the optional technical solution of the present embodiment, as shown in Figure 7As shown in the second embodiment, the ultrasonic probe group 4 and the laser probe group 5 are located on the second straight line and are spaced apart, and the second straight line is parallel to the axis of the conveying roller. An active frame 2 drives the ultrasonic probe group 4 and the laser probe group 5 to move through a driving assembly, so that the active frame 2 can asynchronously scan the pole piece 3 when the active frame 2 extends into and exits the conveying path of the pole piece 3 on the conveying roller, that is, the scanning positions are different at the same time node, and there is a time difference. The measurement of the pole piece 3 obtains the real-time surface density data of the material of the pole piece 3.

[0036] In an optional technical solution of the embodiment, as shown in the second embodiment, Figure 9 As shown in the fourth embodiment, the driving assembly and the active frame 2 are provided with two and are one-to-one transmission connection, and the measurement module is provided with two; the ultrasonic probe group 4 and the laser probe group 5 in the two measurement modules are arranged on the two active frames 2. The two active frames 2 drive one measurement module to move through two driving assemblies, so that the ultrasonic probe group 4 and the laser probe group 5 in the two measurement modules can follow the active frame 2 to make parallel scanning measurement (the two active frames 2 move synchronously, and there is no time difference, but the ultrasonic probe group 4 and the laser probe group 5 on the active frame 2 are located on the second straight line and are spaced apart, and there is a time difference) or alternating scanning measurement (the two active frames 2 move alternately, and there is a time difference, and the ultrasonic probe group 4 and the laser probe group 5 on the active frame 2 are located on the second straight line and are spaced apart, and there is a time difference) to obtain the real-time surface density data of the material of the pole piece 3. 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 conveying roller.

[0037] In an optional technical solution of the embodiment, the driving assembly includes a linear guide rail 8, a motor 9, a shaft coupling 10, a ball screw 11, a guide rail mounting seat 12, and a limiting structure; the linear guide rail 8 is arranged on the base 1 and extends along the axis of the conveying roller, the motor 9 is in transmission connection with the ball screw 11 through the shaft coupling 10, the active frame 2 is connected to the sliding block 13 of the linear guide rail 8 through 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 arranged on the base 1 and is used for limiting the driving stroke of the driving assembly.

[0038] Specifically, the motor 9 is connected with the ball screw 11 through the shaft coupling 10, the nut seat 14 on the ball screw 11 is connected with the guide rail mounting seat 12, the upper surface of the guide rail mounting seat 12 is fixed with the active frame 2, and the lower surface is connected to the linear guide rail 8 through the sliding block 13. An external power source drives the motor 9 to rotate, so that the driving assembly realizes the required precise reciprocating linear motion. The structure is simple, and the driving is stable.

[0039] In this embodiment, the limiting structure includes a photoelectric sensor 21 and / or a bump stop 22; preferably, the photoelectric sensor 21 and the bump stop 22 are provided at the same time to improve the limiting effect. Among them, a photoelectric switch sensor is installed beside the linear guide rail 8, the travel of the moving part is limited by the photoelectric sensor 21, and the bump stop 22 is installed below the ball screw 11 to avoid damage to the driving assembly caused by mechanical flying. The bump stop 22 is made of polyurethane, but it is not limited to this, and can also be made of other materials as long as it meets the requirements.

[0040] In this embodiment, the linear guide rail 8 can be provided with any number of linear guide rails according to requirements.

[0041] In the optional technical solution of this embodiment, the roller seat includes a front upright column 15, a rear upright column 16 and a mounting seat 17, and the conveying rollers include two main rollers 18 and two auxiliary rollers 19; the front upright column 15 and the rear upright column 16 are oppositely arranged on the top of the base 1, and the movable frame 2 is arranged on the side of the rear upright column 16 away from the front upright column 15; the two ends of the two main rollers 18 are arranged on the front upright column 15 and the rear upright column 16 respectively, 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 seat 17, and one of the two auxiliary rollers 19 is located in front of the two main rollers 18, and the other is located behind the two main rollers 18.

[0042] Specifically, the two main rollers 18 are installed on the upper surface of the base 1 through the front upright column 15 and the rear upright column 16, and the two main rollers 18 are kept parallel and horizontal to each other, and the two auxiliary rollers 19 are fixed on the two sides of the base 1 through the mounting seat 17, and the four conveying rollers provide support for the pole piece 3 to ensure the stability of the pole piece 3 during conveying.

[0043] In this embodiment, the front upright column 15 can be integrally formed, and one main roller 18 is correspondingly arranged; or it can be separately made, and one main roller 18 is correspondingly arranged; the rear upright column 16 is the same, which will not be repeated here.

[0044] In this embodiment, the movable frame 2 is C-shaped, but it is not limited to this, and can also be other shapes that meet the requirements. Among them, the ultrasonic probe group 4 and the laser probe group 5 are installed on the movable frame 2, and the ultrasonic calibration member 6 and the laser calibration member 7 are fixed on the front upright column 15. The movable frame 2 is hollow, the circuit board 24 is installed inside the movable frame 2, and the power cord and the signal cord are connected to the outside through the inside of the movable frame 2 and the drag chain 23.

[0045] In the optional technical solution of this embodiment, the base 1 is provided with a lifting eye 20 for lifting. The lifting eye 20 is provided with any number of lifting eyes, as long as it meets the lifting requirements.

[0046] In this embodiment, the lifting eye 20 is provided with four lifting eyes, and the four lifting eyes 20 are installed on the side of the base 1 to facilitate the lifting of the measuring instrument.

[0047] The surface density compensation method of the pole piece 3 provided by the embodiment is implemented by using the ultrasonic laser measuring instrument. Therefore, the technical advantages and effects achieved by the surface density compensation method of the pole piece 3 include the technical advantages and effects achieved by the ultrasonic laser measuring instrument, which will not be described here.

[0048] The compensation method comprises the steps of: obtaining compensation data, wherein the compensation data comprises: a measured surface density of the pole piece 3, a surface density measurement calibration coefficient, a measured thickness of the pole piece 3, and a thickness measurement calibration coefficient; and obtaining a compensated surface density based on the compensation data and a standard thickness reference value of the pole piece 3.

[0049] In the embodiment, the surface density monitoring data, i.e., the compensation data, of the pole piece 3 material on the conveying roller is obtained by reciprocating scanning of the ultrasonic probe group 4 and the laser probe group 5. The data is fed back to the coating closed-loop system. Assuming that there is a deviation between the data and the set value, the coating closed-loop system sends corresponding adjustment instructions to the coating die to change the coating surface density, so as to ensure that the coating surface density meets the set value.

[0050] In the optional technical solution of the embodiment, as shown in Figure 1 the step of obtaining the compensation data comprises: driving an active frame 2 by a driving assembly to drive the ultrasonic probe group 4 and the laser probe group 5 located on the first straight line and spaced apart to synchronously scan the pole piece 3 and respectively obtain the measured surface density of the pole piece 3 and the measured thickness of the pole piece 3; and the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece 3 comprises: determining the compensated surface density by the following formula: ; wherein: p c is the compensated surface density, p u is the measured surface density, h l is the measured thickness, h 0 is the standard thickness reference value, k is a coupling coefficient of the surface density measurement calibration coefficient and the thickness measurement calibration coefficient. The double parameters are synchronously obtained by single scanning, and the measurement delay caused by the probe spacing is eliminated by a space-time registration algorithm.

[0051] In the optional technical solution of the embodiment, as shown in Figure 8 the step of obtaining the compensation data comprises: driving two active frames 2 by two driving assemblies to respectively drive the ultrasonic probe group 4 and the laser probe group 5 to synchronously scan the pole piece 3 in parallel and respectively obtain the real-time measured surface density of the pole piece 3 and the real-time measured thickness of the pole piece 3; the compensation data further comprises a real-time signal-to-noise ratio; and the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece 3 comprises: determining the real-time compensated surface density by the following formula: ; the compensated surface density fused by signal-to-noise ratio weighting is determined by the following formula: ; or the compensation data further comprises a current point predicted thickness; the step of obtaining the compensation data comprises: driving the two movable frames 2 by the two driving assemblies to respectively drive the ultrasonic probe group 4 and the laser probe group 5 to alternately and asynchronously scan the pole piece 3 and respectively obtain the measured surface density of the pole piece 3 and the measured thickness of the pole piece 3, and constructing a Kalman filter model based on the historical measured thickness to obtain the current point predicted thickness; and the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece 3 comprises: determining the compensated surface density by the following formula: ; wherein: p c the compensated surface density, p u the measured surface density, h´ l the current point predicted thickness, h the standard thickness reference value, k the coupling coefficient of the surface density measurement calibration coefficient and the thickness measurement calibration coefficient, p ci the real-time compensated surface density, p ui the real-time measured surface density, h l the real-time measured thickness, SNR i the real-time signal-to-noise ratio. The two modes of compensation are realized when parallel scanning and when alternating scanning, and through differential compensation and dynamic weight distribution in the two modes, the data coordination problem of the double independent motion systems is solved, and the independent motion systems are converted into precision advantages.

[0052] In the optional technical solution of the embodiment, as shown in Figure 7 , the step of obtaining the compensation data comprises: driving one movable frame 2 by one driving assembly to drive the ultrasonic probe group 4 and the laser probe group 5 located on the second straight line and arranged at intervals to asynchronously scan the pole piece 3 and respectively obtain the measured surface density of the pole piece 3 and the measured thickness of the pole piece 3; the compensation data further comprises the state of the pole piece 3, the slurry flow leveling coefficient, the speed 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 step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece 3 comprises: determining the asynchronous scanning delay time of the ultrasonic probe group 4 and the laser probe group 5 by the following formula: ; when the state of the pole piece 3 is a dry film, the current point predicted thickness is determined by the following formula: ; when the state of the pole piece 3 is a wet film, the current point predicted thickness 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. p c To compensate for the density later, p 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. l The leveling coefficient of the slurry. g 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.

[0053] 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: p final To ultimately compensate for the density later, p ci For the first i The compensation data obtained by the measurement module is the first one. i The density following the compensation, p 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. w A The weighting coefficients for the compensation data obtained by the first measurement module. w 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.

[0054] 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, The application relates to a kind of measuring devices for the thickness of electrode sheet, including: Transport assembly, base (1), drive assembly, movable frame (2) and measurement module; The transport assembly includes roller seat and transport roller for transporting electrode sheet (3), the roller seat is arranged on the base (1), and the transport roller is arranged on the roller seat; The drive assembly is arranged on the base (1), the movable frame (2) is arranged on the axial side of the transport roller and is in transmission connection with the drive assembly, the end of the movable frame (2) towards the transport roller is provided with a avoiding gap for avoiding the electrode sheet (3), and the drive assembly is used to drive the movable frame (2) to reciprocate along the axial direction of the transport roller, so that the movable frame (2) enters and exits the transport path of the electrode sheet (3) on the transport roller; The measurement module includes ultrasonic probe group (4), laser probe group (5), ultrasonic calibration element (6) and laser calibration element (7), the ultrasonic probe group (4) and the laser probe group (5) are arranged at the end of the movable frame (2) towards the transport roller, the ultrasonic calibration element (6) and the laser calibration element (7) are arranged on the roller seat, and are respectively matched with the ultrasonic probe group (4) and the laser probe group (5).

2. The ultrasonic laser measurement instrument of claim 1, wherein, The ultrasonic probe group (4) and the laser probe group (5) are located on a first straight line and are arranged at intervals, and the first straight line is parallel to the transport path of the electrode sheet (3) on the transport roller.

3. The ultrasonic laser measurement instrument of claim 1, wherein, The drive assembly and the movable frame (2) are both provided with two and are in one-to-one transmission connection; The ultrasonic probe group (4) and the laser probe group (5) are arranged on two movable frames (2) respectively.

4. The ultrasonic laser measurement instrument of claim 1, wherein, The ultrasonic probe group (4) and the laser probe group (5) are located on a second straight line and are arranged at intervals, and the second straight line is parallel to the axis of the transport roller.

5. The ultrasonic laser measurement instrument of claim 4, wherein, The drive assembly and the movable frame (2) are both provided with two and are in one-to-one transmission connection, and the measurement module is provided with two; The ultrasonic probe group (4) and the laser probe group (5) in the two measurement modules are arranged on two movable frames (2) respectively.

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

7. The ultrasonic laser measuring instrument according to any one of claims 1 to 5, characterized in that The roller seat includes front upright column (15), rear upright column (16) and mounting seat (17), and the transport roller includes two main rollers (18) and two auxiliary rollers (19). The front column (15) and the rear column (16) are oppositely arranged 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 arranged on the front column (15) and the rear column (16) respectively, 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 seat (17), and one of the auxiliary rollers (19) is located in front of the two main rollers (18), and the other auxiliary roller (19) is located behind the two main rollers (18).

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

9. A method of face density compensation of a pole piece, characterized by, The compensation method comprises the steps of: obtaining compensation data, wherein the compensation data comprises: the measured surface density of the pole piece (3), the surface density measurement calibration coefficient, the measured thickness of the pole piece (3), and the thickness measurement calibration coefficient; obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece (3).

10. The method of face density compensation of pole pieces according to claim 9, characterized in that, The step of obtaining compensation data comprises: driving an activity frame (2) through a driving assembly to drive the ultrasonic probe group (4) and the laser probe group (5) located on the first straight line and arranged at intervals to synchronously scan the pole piece (3) and obtain the measured surface density of the pole piece (3) and the measured thickness of the pole piece (3) respectively; The step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece (3) comprises: determining the compensated surface density by the following formula: ； wherein: ρ c is the measured surface density, ρ u is the measured surface density, h l is the measured thickness, h 0 is a standard thickness reference value, k is a coupling coefficient of the surface density measurement calibration coefficient and the thickness measurement calibration coefficient.

11. The method of face density compensation of pole pieces according to claim 9, characterized in that, The step of obtaining compensation data comprises: driving two activity frames (2) through two driving assemblies to drive the ultrasonic probe group (4) and the laser probe group (5) to synchronously scan the pole piece (3) in parallel and obtain the real-time measured surface density of the pole piece (3) and the real-time measured thickness of the pole piece (3) respectively; the compensation data further comprises a real-time signal-to-noise ratio; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece (3) comprises: determining the real-time compensated surface density by the following formula: ； The formula for determining the compensated surface density weighted and fused according to the signal-to-noise ratio is: ； Or; The compensation data further comprises a current point predicted thickness; the step of obtaining compensation data comprises: driving two activity frames (2) through two driving assemblies to drive the ultrasonic probe group (4) and the laser probe group (5) to alternately and asynchronously scan the pole piece (3) and obtain the measured surface density of the pole piece (3) and the measured thickness of the pole piece (3) respectively, and constructing a Kalman filter model based on the historical measured thickness to obtain the current point predicted thickness; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece (3) comprises: determining the compensated surface density by the following formula: ； wherein: ρ c is the compensated backside density, ρ u is the measured areal density, h´ l is the current point predicted thickness, h 0 is the standard thickness reference value, k is the coupling coefficient of the areal density measurement calibration coefficient and the thickness measurement calibration coefficient, ρ ci is the real-time compensated backside density, ρ ui is the real-time measured areal density, h l is the real-time measured thickness, SNR i is the real-time signal-to-noise ratio.

12. The method of face density compensation of pole pieces according to claim 9, wherein, The step of obtaining compensation data comprises: driving an active frame (2) by a driving assembly to drive the ultrasonic probe group (4) and the laser probe group (5) on the second straight line and asynchronously scan the pole piece (3) and respectively obtain the measured surface density of the pole piece (3) and the measured thickness of the pole piece (3); The compensation data further comprises the state of the pole piece (3), a slurry flow leveling coefficient, a speed gradient influence factor, a current point predicted thickness, a distance between the ultrasonic probe group (4) and the laser probe group (5) on the second straight line, a movement speed of the active frame (2) and time; The step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece (3) comprises: determining an asynchronous scanning delay time of the ultrasonic probe group (4) and the laser probe group (5) by the following formula: ； When the state of the pole piece (3) is a dry film, the current point predicted thickness is determined by the following formula: ； When the state of the pole piece (3) is a wet film, the current point predicted thickness is determined by the following formula: ； The compensated surface density is determined by the following formula: ； wherein: Δt is the ultrasonic probe group (4) and laser probe group (5) asynchronous scanning delay time, L is the ultrasonic probe group (4) and laser probe group (5) spacing on the second straight line, v is the speed, t is the time, ρ c is the compensation of the rear density, ρ u is the measured surface density, h l is the measured thickness, h 0 is the standard thickness reference value, h´ l is the current point predicted thickness, β 0 is the surface density measurement calibration coefficient, β 1 is the thickness measurement calibration coefficient, λ is the slurry flow leveling coefficient, γ is the speed gradient influence factor.

13. The method of face density compensation of pole pieces according to claim 12, characterized in that, The step of obtaining compensation data comprises: driving two movable frames (2) by two driving assemblies respectively to drive an ultrasonic probe group (4) and a laser probe group (5) in a measuring module to scan the pole piece (3) in parallel and to obtain real-time measured surface density of the pole piece (3) and real-time measured thickness of the pole piece (3) respectively; the compensation data further comprises a compensation data weight coefficient obtained by a first measuring module and a compensation data weight coefficient obtained by a second measuring module; and the step of obtaining the compensated surface density based on the compensation data and a standard thickness reference value of the pole piece (3) comprises: determining a first compensated surface density obtained by the compensation data obtained by the first measuring module by the following formula: i i ​​ ； The final compensated surface density is determined by the following formula: ； Or; The compensation data further comprises measured thickness estimation value and secondary compensation coefficient; the step of obtaining the compensation data comprises: driving the two movable racks (2) by the two driving assemblies respectively to drive the ultrasonic probe group (4) and the laser probe group (5) in a measurement module to alternately scan the pole piece (3) and obtain the real-time measured surface density of the pole piece (3) and the real-time measured thickness of the pole piece (3) respectively, and generating the measured thickness estimation value based on the historical measured thickness interpolation; the step of obtaining the compensated surface density based on the compensation data and the standard thickness reference value of the pole piece (3) comprises: determining the first i compensated surface density obtained by the first measurement module based on the compensation data obtained by the first measurement module through the following formula: i ​ ； The final compensated surface density is determined by 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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