Automatic fineness instrument for lithium ion battery negative electrode slurry and control method

Abstract

The invention relates to an automatic fineness instrument for lithium ion battery negative electrode slurry and a control method, and belongs to the technical field of lithium ion battery manufacturing and detection. The automatic fineness instrument for the lithium ion battery cathode slurry comprises a base, a scraping plate, a scraping knife, a driving assembly, an image acquisition instrument and a laser micrometer, the scraping plate is arranged on the base and is provided with at least two detection grooves extending in the length direction; the scraper is located above the scraper blade and is in contact with the surface of the scraper blade, and the driving assembly is used for driving the scraper to move in the length direction of the detection groove; the image acquisition instrument is used for acquiring image information of the lithium ion battery negative electrode slurry, and the laser micrometer is used for detecting granularity information of the lithium ion battery negative electrode slurry; a touch screen is arranged on one side of the base, a control system is integrated on the touch screen, and the control system is electrically connected with the driving assembly, the image acquisition instrument and the laser micrometer respectively. The scheme provided by the invention has the advantages of improving the detection precision, reducing personal errors, realizing automatic detection and the like.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium ion battery manufacturing detection, and particularly relates to an automatic fineness instrument for lithium ion battery negative electrode slurry and a control method. BACKGROUND

[0002] In the production and manufacturing process of a lithium ion battery, the fineness of an electrode slurry is one of the core indexes determining the performance of the battery. The electrode slurry is mainly composed of active material particles, a conductive agent, a binder and a solvent, and the fineness of the electrode slurry directly reflects the uniformity of the dispersion of the solid particles in the slurry. The negative electrode slurry has higher viscosity and thixotropy due to its special material composition, and the requirement for the particle dispersion degree is more stringent. If there are coarse particles or agglomerates that are not fully dispersed, the electrode coating thickness will be uneven, and the conductive network will be discontinuous, thereby causing the battery internal resistance to increase, the capacity to decay rapidly and other chain reactions, and even causing internal short circuit, thermal runaway and other safety hazards. Therefore, establishing an accurate and reliable negative electrode slurry fineness detection system is a key technical bottleneck for guaranteeing the consistency and safety of the lithium ion battery product.

[0003] The current industry generally uses a scraper fineness instrument detection scheme, which has systematic defects and cannot meet the quality control requirements of the negative electrode slurry in the modern lithium ion battery manufacturing. The uncontrollability of the manual operation link is particularly prominent. When the operator manually pushes the scraper, the individual differences in the applied force and the moving speed will cause uneven distribution of the shear stress. This artificial fluctuation will be significantly amplified in the detection of the high-viscosity negative electrode slurry, which not only causes secondary agglomeration of the particles, but also forms false scratch defects. The detection dimension of the traditional equipment is too single, and only relies on the visual judgment of the operator or the basic optical detection, which cannot realize the digital recording of the surface morphology of the slurry, nor can it accurately measure the particles of μm level, resulting in a high missing detection rate of the key coarse particles in the negative electrode slurry. The open detection environment design makes the external dust easily mixed into the slurry, and the mechanical structure lacking real-time feedback cannot adapt to the change of the rheological properties of different batches of slurry. These factors superimposed cause the dispersion degree of the detection data to exceed the process control standard. The design defects of the scraper structure further restrict the detection precision. The single-slot layout cannot perform parallel experiment verification, the interface effect between the slot body material and the slurry will cause residual pollution, and the fixed geometric size of the scraping slot cannot adapt to the flow leveling characteristics of the slurry with different solid contents. These structural defects seriously restrict the reliability improvement of the detection method.

[0004] The prior art needs to be improved in view of the above problems. SUMMARY

[0005] To overcome the problems in the related art, the present application provides a kind of automatic fineness instrument of lithium ion battery negative electrode slurry, can be detected by integrating automation driving assembly, image acquisition and laser micrometer combined detection and intelligent control system, realizes the automation operation of lithium ion battery negative electrode slurry fineness detection, multidimensional data acquisition and accurate analysis, effectively improves the detection efficiency, precision and environmental adaptability, reduces artificial error.

[0006] The first aspect of the present application provides an automatic fineness instrument for lithium ion battery negative electrode slurry, comprising a base, a scraper, a doctor blade, a drive assembly, an image acquisition instrument and a laser micrometer; The scraper is provided on the base, and the scraper has at least two detection grooves extending in the length direction; the doctor blade is located above the scraper and in contact with the surface of the scraper; the drive assembly is used to drive the doctor blade to move along the length direction of the detection groove; the image acquisition instrument is used to acquire image information of the lithium ion battery negative electrode slurry; and the laser micrometer is used to detect particle size information of the lithium ion battery negative electrode slurry. One side of the base is provided with a touch screen, and the touch screen is integrated with a control system; the control system is electrically connected with the drive assembly, the image acquisition instrument and the laser micrometer respectively.

[0007] In some embodiments, a protective cover is further included, which covers the base, and the scraper, the doctor blade and the drive assembly are located in the protective cover.

[0008] In some embodiments, the inner wall of the detection groove is provided with a polytetrafluoroethylene coating, the edge distance between adjacent detection grooves is 20-30 mm, the width of the inlet end of the detection groove is 10-15 mm, and the width of the outlet end is 5-8 mm.

[0009] In some embodiments, the drive assembly includes a stepper motor, a linear module and a doctor blade mounting seat; the fixed end of the linear module is provided on the base through a support; the rotating end of the linear module is connected with the stepper motor; the doctor blade mounting seat is provided on the moving end of the linear module; the doctor blade is rotationally connected with the doctor blade mounting seat through a shaft; the doctor blade mounting seat is provided with a threaded hole; an adjusting screw is fitted in the threaded hole; one end of the adjusting screw is connected with a spring; the end of the spring away from the adjusting screw abuts against the doctor blade; and the other end of the adjusting screw is provided with a knob.

[0010] In some embodiments, the protective cover is made of transparent acrylic plate; one side of the protective cover is provided with a window; a closable door body is fitted at the window; and a sealing rubber strip is provided at the connection between the door body and the window. A fill light is provided in the protective cover, and the fill light is electrically connected with the control system.

[0011] In some embodiments, the image collector comprises a camera and a macro lens arranged at the shooting end of the camera.

[0012] In some embodiments, the top end surface of the base is provided with a positioning hole, and the bottom of the scraper is provided with a positioning pin, which is inserted into the positioning hole to position the scraper and the base.

[0013] The second aspect of the present application provides a control method of an automatic fineness instrument for lithium ion battery negative electrode slurry, which is controlled based on the above-mentioned automatic fineness instrument for lithium ion battery negative electrode slurry, and comprises the following steps: (1) initialization self-checking: after the control system is started, the driving assembly, the image collector and the laser micrometer are self-checked to confirm that the states of the components are normal; (2) parameter setting: the detection parameters are input through the touch screen, and the parameters include the scraper moving speed, the image collection frequency and the particle size threshold value; (3) slurry injection: the lithium ion battery negative electrode slurry is injected into the detection groove of the scraper; (4) scraping and detection: the control system drives the driving assembly according to the preset speed parameter to drive the scraper to move along the length direction of the detection groove to scrape the surface of the slurry; at the same time, the image collector collects the image information of the slurry at the preset frequency, and the laser micrometer synchronously detects the particle size data of the slurry; (5) data analysis and result output: the control system receives the image information and the particle size data, identifies the particle size distribution through the built-in analysis software, and compares with the preset threshold value; if the detection result exceeds the threshold value, the control system triggers an out-of-limit warning; if the detection result is qualified, a test report containing the particle size distribution, the detection time and the equipment number is automatically generated and stored in the local or displayed through the touch screen.

[0014] As can be seen from the above, the automatic fineness instrument for lithium ion battery negative electrode slurry and the control method thereof provided by the present application drive the scraper to move through the automatic control system, realize the accurate detection of the fineness of the slurry in cooperation with the image collector and the laser micrometer, solve the problems of large error and low efficiency in traditional manual detection, and have the advantages of improving the detection precision, reducing human error and realizing automatic detection. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of exemplary embodiments of the present application taken in conjunction with the accompanying drawings, in which like reference characters refer to the like parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the present application.

[0016] Figure 1 FIG. 1 is a structural schematic diagram of an automatic fineness instrument for lithium ion battery negative electrode slurry according to an embodiment of the present application.

[0017] Reference signs: 1, base; 2, scraper; 21, detection groove; 3, doctor blade; 4, touch screen; 5, protective cover; 6, stepper motor; 7, linear module; 8, doctor blade mounting seat; 9, bracket; 10, knob; 11, window. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present application will be described in more detail by referring to the attached drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0019] Reference Figure 1 The present application proposes an automatic fineness instrument for lithium ion battery negative electrode slurry, which comprises a base 1, a scraper 2, a doctor blade 3, a driving assembly, an image acquisition instrument and a laser micrometer. The scraper 2 is arranged on the base 1, and the scraper 2 has at least two detection grooves 21 extending along the length direction. The doctor blade 3 is located above the scraper 2 and in contact with the surface of the scraper 2. The driving assembly is used to drive the doctor blade 3 to move along the length direction of the detection groove 21. The image acquisition instrument is used to acquire image information of the lithium ion battery negative electrode slurry, and the laser micrometer is used to detect particle size information of the lithium ion battery negative electrode slurry. One side of the base 1 is provided with a touch screen 4, and the touch screen 4 is integrated with a control system. The control system is electrically connected with the driving assembly, the image acquisition instrument and the laser micrometer respectively.

[0020] Among them, the base 1 can be made of metal or high-strength plastic, which is used to support the entire equipment and maintain stability. The scraper 2 can be made of stainless steel or hard alloy material, and the number of detection grooves 21 can be set to two, three or more as needed. The doctor blade 3 can be made of hard alloy or ceramic material, and its blade edge is precisely ground to ensure the scraping effect. The driving assembly can adopt a stepper motor 6, a servo motor or a linear motor, which cooperates with a guide rail or a lead screw to realize precise movement. The image acquisition instrument can adopt a CCD or CMOS sensor, which is matched with lenses of different magnifications to adapt to the detection needs of different particle sizes. The laser micrometer can adopt a diffraction or scattering principle, and the measurement range can cover 1 μm to 100 μm. The touch screen 4 can be resistive or capacitive, and is integrated with parameter setting, data display and alarm functions. The control system can adopt a PLC or an embedded processor to realize automatic operation and data processing of the equipment.

[0021] In this embodiment, through the integrated automatic detection system, the problems of relying on manual operation, single detection means and insufficient precision of the traditional doctor blade 2 fineness instrument are solved. Among them, the driving assembly realizes the automatic movement of the scraper 3, avoiding the error caused by manual operation. The combination of the image acquisition instrument and the laser micrometer can simultaneously obtain the surface morphology and particle size distribution information of the slurry, improving the comprehensiveness and accuracy of the detection. The integration of the touch screen 4 and the control system realizes the automation of parameter setting, data acquisition and analysis, reducing human intervention. The multiple design of the detection groove 21 can support multiple parallel detection, improving the reliability of the results. Compared with the prior art, the scheme has the advantages of high automation degree, good detection precision and simple operation, and can meet the strict requirements of lithium ion battery negative electrode slurry on fineness detection.

[0022] Further, the application also proposes a protective cover 5 structure, the protective cover 5 covers the base 1, and the doctor blade 2, the scraper 3 and the driving assembly are located in the protective cover 5. The protective cover 5 is made of transparent acrylic plate, one side of which is provided with an openable and closable door body with sealing rubber strips, and the protective cover 5 is also provided with a light supplement lamp electrically connected with the control system.

[0023] The protective cover 5 can adopt the following implementation modes: the transparent material can also be tempered glass or polycarbonate plate in addition to acrylic plate; the door body can be opened and closed through hinges or sliding rails; the sealing rubber strips can adopt silicone or fluororubber material; the light supplement lamp can adopt LED array or fluorescent lamp, and its installation position can be set at the top or side wall of the protective cover 5. The connection between the protective cover 5 and the base 1 can adopt buckle type or bolt fixing mode.

[0024] The protective cover 5 structure effectively isolates external dust interference through closed design, the transparent material facilitates observation of the internal detection process, the openable and closable door body facilitates operation and maintenance, and the sealing rubber strips ensure the cleanliness of the internal environment. The light supplement lamp provides stable lighting conditions, and cooperates with the image acquisition instrument to obtain clear slurry surface images. Compared with the existing open doctor blade 2 structure, this design solves the technical problems of high-viscosity negative electrode slurry being easily polluted by the environment during the detection process and unstable lighting conditions leading to detection errors, and realizes the controllability of the detection environment and the repeatability of the detection results.

[0025] Further, the application also proposes that the inner wall of the detection groove 21 is provided with a polytetrafluoroethylene coating, the edge distance between adjacent detection grooves 21 is 20-30 mm, the width of the inlet end of the detection groove 21 is 10-15 mm, and the width of the outlet end is 5-8 mm.

[0026] The polytetrafluoroethylene coating has low surface energy characteristics, which can effectively reduce the adhesion and residue of the slurry in the tank. Specifically, the coating can be achieved by a spraying or dipping process, with a thickness controlled in the range of 10-50 μm. The edge spacing of the detection tank 21 is designed to be 20-30 mm, which can avoid the splashing interference of the slurry during the scraping process of adjacent tank bodies, while ensuring the detection efficiency. As a preferred embodiment, the inlet end width is set to 10-15 mm to facilitate the injection of the slurry, and the outlet end is narrowed to 5-8 mm to form a gradual scraping pressure gradient, which is beneficial to the uniform dispersion of particles in the slurry.

[0027] In this embodiment, by optimizing the structural parameters and surface treatment of the detection tank 21, the three technical problems of the traditional scraper 2 in detecting high-viscosity negative electrode slurry are solved: detection error caused by slurry residue, mutual interference during multi-tank detection, and uneven pressure distribution during scraping. The polytetrafluoroethylene coating reduces the adhesion between the slurry and the tank wall, so that the surface energy of the slurry after scraping can truly reflect the particle distribution state; the precisely designed tank edge spacing and width parameters ensure the independence of multi-tank parallel detection, and form a gradient shear force through the wide inlet and narrow outlet structure, effectively avoiding particle agglomeration. Compared with the traditional single-tank scraper 2, this design significantly improves the repeatability and accuracy of the detection data.

[0028] Further, the application also provides a specific structure of the driving assembly. The driving assembly comprises a stepping motor 6, a linear module 7, and a scraper mounting seat 8. The fixed end of the linear module 7 is arranged on the base 1 through a support 9, the stepping motor 6 is connected to the rotating end of the linear module 7, the scraper mounting seat 8 is arranged on the moving end of the linear module 7, and the scraper 3 is rotatably connected to the scraper mounting seat 8 through a rotating shaft. The scraper mounting seat 8 is provided with a screw hole, an adjusting screw is arranged in the screw hole in a matched manner, one end of the adjusting screw is connected to a spring, the end of the spring away from the adjusting screw abuts against the scraper 3, and the other end of the adjusting screw is provided with a knob 10.

[0029] Specifically, the stepping motor 6 can adopt a two-phase hybrid stepping motor 6 with a step angle of 1.8 degrees, and can realize a step angle control accuracy of 0.9 degrees by cooperating with a subdivision driver. The linear module 7 preferably adopts a ball screw type linear guide rail, and the repeat positioning accuracy can reach ±0.01 mm. The rotating shaft of the scraper mounting seat 8 can be made of stainless steel, with a diameter in the range of 6-8 mm, and both ends are rotatably supported by deep groove ball bearings. The adjusting screw adopts an M4 fine thread with a pitch of 0.5 mm, and the surface of the knob 10 is provided with anti-slip lines. The spring is a stainless steel compression spring, and the elastic coefficient is in the range of 5-8 N / mm.

[0030] As a preferred embodiment, the scraper mounting seat 8 can be provided with an angular scale dial to facilitate observation of the contact angle of the scraper 3 with the scraper plate 2. The movement speed of the linear module 7 can be steplessly adjusted by the control system within the range of 10-50 mm / s. The pre-tightening force of the spring can be precisely adjusted by the knob 10, and the adjustment range is 2-5 N.

[0031] The driving assembly provided by the present application realizes the precise linear motion of the scraper 3 through the cooperation of the stepping motor 6 and the linear module 7, avoiding the speed fluctuation problem caused by manual operation. The rotary connection structure of the scraper mounting seat 8 cooperates with the spring pressure adjusting mechanism to ensure that the scraper 3 and the scraper plate 2 maintain constant contact pressure, adapting to the slurry detection requirements of different viscosities. The stepless adjustable design of the adjusting screw and the spring realizes the stepless adjustment of the pressure of the scraper 3, solving the problem that the traditional equipment cannot accurately control the scraping force. The high-precision motion characteristics of the linear module 7 ensure the stability of the scraping process, effectively reducing the particle agglomeration phenomenon caused by uneven speed.

[0032] Further, the present application also provides that the protective cover 5 is made of transparent acrylic plate, one side of the protective cover 5 is provided with a window 11, a closable door body is arranged at the window 11, and a sealing rubber strip is arranged at the connection between the door body and the window 11; a light supplementing lamp is arranged in the protective cover 5, and the light supplementing lamp is electrically connected with the control system.

[0033] The transparent acrylic plate has high light transmittance and chemical corrosion resistance, which can isolate external dust pollution without affecting the work of the image acquisition instrument. The window 11 design is convenient for the operator to observe the internal working state or to intervene in an emergency without opening the protective cover 5, and the door body realizes dustproof sealing through the sealing rubber strip. The light supplementing lamp adopts an LED array, and the color temperature and brightness thereof are adjusted by the control system to ensure stable image acquisition quality under different environmental light conditions. As a preferred embodiment, the light supplementing lamp can be arranged as a ring-shaped light source to eliminate shadow interference.

[0034] The technical scheme solves the problem that the traditional detection equipment is easily disturbed by the environment through integrated protection design. The transparent protective cover 5 effectively isolates the pollution of external dust to the slurry sample while ensuring observation requirements; the sealing door body design takes into account the convenience of operation and environmental control requirements; the built-in light supplementing lamp provides standardized lighting conditions for image acquisition through programmed control, eliminating the uncertainty of manual light source arrangement. Thus, the structure maintains the stability of the detection environment while improving the reliability and repeatability of automatic detection.

[0035] Further, the present application also provides that the image acquisition instrument comprises a camera and a macro lens, and the macro lens is arranged at the shooting end of the camera.

[0036] The camera adopts an industrial-grade CMOS sensor, with a resolution of not less than 20 million pixels, a frame rate adjustable range of 30-120 fps, and an automatic white balance and exposure compensation function. The macro lens is designed to be replaceable, with an optical magnification of 1X-5X continuously adjustable, a working distance maintained within a range of 50-100 mm, and a depth of field control accuracy of ±0.1 mm. The camera and the macro lens are mechanically coupled through a C-type interface, and a dustproof sealing ring is arranged at the interface. As a preferred embodiment, the macro lens is equipped with a ring-shaped LED light supplement module, and the light supplement intensity is adjusted by PWM through a control system.

[0037] Specifically, the technical scheme combines a high-resolution camera with an adjustable magnification macro lens, which can simultaneously meet the dual requirements of recording the macroscopic morphology of the slurry surface and capturing the microscopic particle characteristics. The short working distance design of the macro lens effectively avoids the problem of insufficient depth of field in traditional optical systems when detecting high-viscosity slurry, and its continuous zoom function can adaptively focus on particles of different size ranges. The axial illumination method of the ring-shaped light supplement module can eliminate the texture shadows on the slurry surface caused by scraping, ensuring that the image contrast meets the requirements of particle edge recognition. Thus, the structure solves the problem of missing detection of coarse particles caused by insufficient resolution in traditional visual detection, and overcomes the technical contradiction that a single optical system cannot simultaneously evaluate macroscopic uniformity and measure microscopic particle size.

[0038] Further, the top end face of the base 1 is provided with a positioning hole, and the bottom of the scraper 2 is provided with a positioning pin, which is inserted into the positioning hole to position the scraper 2 and the base 1.

[0039] Specifically, the positioning hole and the positioning pin can be implemented in the following ways: the positioning hole is a conical counterbore, and the positioning pin is a conical pin matched therewith, which realizes radial positioning through conical surface cooperation; or the positioning hole is a cylindrical hole, and the positioning pin is a cylindrical pin with a chamfer, which uses transition fit to ensure assembly accuracy; further, the positioning hole can be provided with 2-4 asymmetrically distributed positioning holes, and the number and position of the corresponding positioning pins are matched therewith to prevent the scraper 2 from being installed in reverse. As a preferred embodiment, the positioning pin is made of stainless steel, with a diameter tolerance controlled within ±0.01 mm, and a wear-resistant alloy bushing can be arranged on the inner wall of the positioning hole to prolong the service life.

[0040] Therefore, the technical scheme solves the alignment accuracy problem of the scraper 2 and the base 1 through the mechanical positioning structure. In the repeated disassembly and assembly process of the scraper 2, the plug-in cooperation of the positioning pin and the positioning hole can ensure that the relative position of the detection groove 21 and the scraper 3 remains constant after the scraper 2 is installed each time, avoiding the position deviation caused by manual adjustment. Among them, the asymmetric distribution of the positioning structure can effectively prevent misinstallation, and the taper surface cooperation or transition cooperation design ensures the positioning repeatability. Compared with the traditional manual visual alignment method, the mechanical positioning method controls the installation position error of the scraper 2 within 0.05 mm, thereby ensuring the parallelism of the scraper 3 and the detection groove 21 in the slurry scraping process, and improving the repeatability and accuracy of the fineness detection.

[0041] Further, the application also proposes a control method of the automatic fineness instrument of the lithium ion battery negative electrode slurry, which is controlled based on the automatic fineness instrument including the base 1, the scraper 2, the scraper 3, the driving assembly, the image acquisition instrument, the laser micrometer and the touch screen 4 control system. The specific control steps include five stages of initialization self-checking, parameter setting, slurry injection, scraping and detection, data analysis and result output. Among them, the initialization self-checking stage confirms the state of the driving assembly, the image acquisition instrument and the laser micrometer through the control system; the parameter setting stage allows the key parameters such as the moving speed of the scraper 3, the image acquisition frequency and the particle size threshold to be set through the touch screen 4; the slurry injection stage introduces the negative electrode slurry into the detection groove 21 of the scraper 2; the scraping and detection stage completes the scraping operation by the driving assembly at the preset speed, and the image acquisition instrument and the laser micrometer synchronously collect the slurry surface image and the particle size data; and the final stage processes the data through the built-in analysis software and outputs the detection report or triggers the early warning.

[0042] For the control of the moving speed of the scraper 3, the step motor 6 can be used to realize stepless speed regulation of 0.1-5 mm / s in cooperation with the linear module 7, wherein the low-speed mode is suitable for high-viscosity slurry to avoid particle shear aggregation. The image acquisition frequency can be set to 10-60 frames / second, and the micro-lens is used to capture the micro-morphology of the slurry surface. The setting of the particle size threshold supports multi-level classification, for example, the particles with a particle size exceeding 50 μm are defined as out-of-specification particles. The edge detection algorithm is used in the data analysis link to identify the particle contour, and the refractive index data of the laser micrometer are combined to calculate the equivalent particle size distribution. When the test report is generated, PDF or Excel format can be selected, including the particle size distribution histogram, the D50 value and the detection environment parameters.

[0043] The control method solves the problem of poor repeatability caused by traditional manual operation through integrated automatic control. The closed-loop control of the drive assembly ensures the stability of the movement of the scraper 3, avoiding the disturbance of human force fluctuation to the structure of the slurry. The synchronous work of the image acquisition instrument and the laser micrometer realizes the correlation analysis of the surface topography and the particle size data, which is more capable of identifying trace coarse particles than single detection means. Parameterization setting and automatic early warning mechanism reduce the error of manual judgment, and the constant light environment in the protective cover 5 eliminates the interference of external light. Through the combination of standardized detection process and digital analysis output, the accuracy and efficiency of the negative electrode slurry fineness detection are significantly improved.

[0044] Further, the application also provides a control method of a lithium ion battery negative electrode slurry automatic fineness instrument, which is based on the aforementioned automatic fineness instrument and includes the following steps: initialization self-checking, parameter setting, slurry injection, scraping and detection, data analysis and result output.

[0045] In the initialization self-checking step, after the control system is started, the drive assembly, image acquisition instrument and laser micrometer are self-checked to confirm that the states of each component are normal. The parameter setting step inputs the detection parameters through the touch screen 4, including the moving speed of the scraper 3, the image acquisition frequency and the particle size threshold. The slurry injection step injects the lithium ion battery negative electrode slurry into the detection groove 21 of the scraping plate 2. In the scraping and detection step, the control system drives the drive assembly according to the preset speed parameter to drive the scraper 3 to move along the length direction of the detection groove 21 to scrape the surface of the slurry; at the same time, the image acquisition instrument acquires the image information of the slurry at the preset frequency, and the laser micrometer synchronously detects the particle size data of the slurry. In the data analysis and result output step, the control system receives the image information and the particle size data, identifies the particle size distribution through the built-in analysis software and compares it with the preset threshold; if the detection result exceeds the threshold, the control system triggers the over-limit early warning; if the detection result is qualified, a test report containing the particle size distribution, the detection time and the equipment number is automatically generated and stored locally or displayed through the touch screen 4.

[0046] Specifically, in the scraping and detection step, the moving speed of the scraper 3 can be adjusted according to the viscosity of the slurry, for example, for high-viscosity negative electrode slurry, low-speed scraping is adopted to reduce the particle agglomeration caused by uneven shear force. The image acquisition instrument can use a high-frame-rate camera combined with a macro lens to ensure clear recording of the surface morphology of the slurry. The detection data of the laser micrometer can be synchronously marked with the image information, facilitating subsequent correlation analysis. In the data analysis step, the built-in analysis software can use machine learning algorithms to identify the particle distribution characteristics in the image, and comprehensively determine whether the slurry fineness meets the standard in combination with the particle size data of the laser micrometer. The over-limit early warning can be prompted through sound and light alarm or pop-up window of the touch screen 4, and the test report can be exported in a standardized format for production traceability.

[0047] In this embodiment, the traditional manual operation is replaced by an automated process, reducing human error; combining image and laser detection technology, improving the comprehensiveness and accuracy of fineness detection; at the same time, through real-time data analysis and early warning mechanism, to ensure that unqualified slurry is intercepted in time, so as to solve the problems of poor repeatability, insufficient precision and control lag of traditional detection methods.

[0048] Further, the application also proposes a control method of a lithium ion battery negative electrode slurry automatic fineness instrument, which is realized based on an automatic fineness instrument comprising a base 1, a scraper 2, a scraper 3, a driving assembly, an image acquisition instrument, a laser micrometer and a control system. The specific control steps include: first, performing initialization self-checking, detecting the state of the driving assembly, the image acquisition instrument and the laser micrometer through the control system; then setting the scraper 3 moving speed, image acquisition frequency and particle size threshold parameters through the touch screen 4; after injecting the slurry into the detection groove 21 of the scraper 2, the control system drives the scraper 3 to move at a preset speed to flatten the surface of the slurry, while the image acquisition instrument collects the slurry image and the laser micrometer synchronously detects the particle size data; finally, the control system analyzes the data and outputs the detection result, if it exceeds the threshold, it triggers an early warning, and if it is qualified, it generates a test report containing particle size distribution, detection time and equipment number.

[0049] In the parameter setting link, the scraper 3 moving speed can be set to a continuous adjustable range of 10-50mm / s, the image acquisition frequency is preferably 30-60 frames / second, and the particle size threshold is set to a hierarchical threshold of 5-50μm according to the type of slurry. When the slurry is injected, the slurry liquid level in the detection groove 21 should be consistent to avoid detection errors caused by liquid level fluctuations. In the data analysis stage, the image recognition algorithm is used to extract the particle contour, and a three-dimensional particle size distribution model is established combined with the scattering data of the laser micrometer, and the detection accuracy can reach ±0.5μm.

[0050] Through the integrated automatic detection process, the problems of poor repeatability and insufficient detection accuracy caused by traditional manual operation are solved. Among them, the multi-parameter cooperative control realizes the accurate matching of the scraping force and the detection timing, avoiding the particle shear deformation caused by human intervention; the dual-mode detection technology, such as image combined with laser, can synchronously obtain surface morphology and three-dimensional particle size data, significantly improving the recognition rate of trace coarse particles; the standardized report generation function eliminates manual recording errors, providing traceable data support for slurry quality control. The whole control process is completed in a closed protective environment, effectively isolating external dust interference and ensuring the consistency of the detection results.

[0051] Having described various embodiments of the application, it is to be understood that the above description is meant not to limit and not to encompass all of the possible embodiments. Many modifications and variations of this application can be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. It is intended that the scope of the application be defined by the scope of the patent and by the claims as allowed by the patent office, which can include adaptations based on the description, equivalents, and / or substitutions of elements individually or collectively to the entire disclosure.

Claims

1. An automatic fineness meter for negative electrode slurry of lithium ion battery, characterized in that: It comprises a base (1), a scraper (2), a scraper (3), a driving component, an image acquisition device and a laser micrometer; The scraper (2) is arranged on the base (1), and the scraper (2) has at least two detection grooves (21) extending along the length direction; the scraper (3) is located above the scraper (2) and contacts the surface of the scraper (2), and the driving component is used to drive the scraper (3) to move along the length direction of the detection grooves (21); the image acquisition instrument is used to collect image information of the lithium-ion battery negative electrode slurry, and the laser micrometer is used to detect the particle size information of the lithium-ion battery negative electrode slurry; A touch screen (4) is provided on one side of the base (1), and the touch screen (4) is integrated with a control system, and the control system is electrically connected to the drive component, the image acquisition instrument and the laser micrometer respectively.

2. The automatic fineness meter for lithium-ion battery negative electrode slurry according to claim 1, characterized in that: It also includes a protective cover (5), which covers the base (1), and the scraper (2), scraper (3) and driving assembly are all located in the protective cover (5).

3. The automatic fineness meter for lithium-ion battery negative electrode slurry according to claim 1, characterized in that: The inner wall of the detection groove (21) is provided with a polytetrafluoroethylene coating, the edge spacing between adjacent detection grooves (21) is 20mm to 30mm, the inlet end width of the detection groove (21) is 10mm to 15mm, and the outlet end width is 5mm to 8mm.

4. The automatic fineness meter for negative electrode slurry of lithium-ion battery according to claim 1, characterized in that: The driving assembly comprises a stepper motor (6), a linear module (7) and a scraper mounting seat (8); the fixed end of the linear module (7) is arranged on the base (1) through a bracket (9); the stepper motor (6) is connected to the rotating end of the linear module (7); the scraper mounting seat (8) is arranged on the moving end of the linear module (7); the scraper (3) is rotatably connected to the scraper mounting seat (8) through a rotating shaft; the scraper mounting seat (8) is provided with a screw hole, an adjusting screw is provided in the screw hole, one end of the adjusting screw is connected to a spring, the end of the spring away from the adjusting screw is in contact with the scraper (3), and the other end of the adjusting screw is provided with a knob (10).

5. The automatic fineness meter for negative electrode slurry of lithium-ion battery according to claim 2, characterized in that: The protective cover (5) is made of a transparent acrylic plate. A window (11) is provided on one side of the protective cover (5). An openable and closable door body is provided at the window (11). A sealing strip is provided at the connection between the door body and the window (11). A fill light is provided in the protective cover (5), and the fill light is electrically connected to the control system.

6. The automatic fineness meter for negative electrode slurry of lithium-ion battery according to claim 1, characterized in that: The image acquisition device includes a camera and a macro lens, and the macro lens is arranged at the shooting end of the camera.

7. The automatic fineness meter for negative electrode slurry of lithium-ion battery according to claim 1, characterized in that: A positioning hole is provided on the top end surface of the base (1), and a positioning pin is provided on the bottom of the scraper (2). The positioning pin is plugged into and matched with the positioning hole to achieve positioning of the scraper (2) and the base (1).

8. A control method for an automatic fineness meter for negative electrode slurry of a lithium-ion battery, characterized in that: The control is performed based on the automatic fineness meter for lithium-ion battery negative electrode slurry according to any one of claims 1 to 7, comprising the following steps: (1) Initialization self-test: After the control system is started, the drive components, image acquisition device and laser micrometer are self-tested to confirm that the status of each component is normal; (2) Parameter setting: input detection parameters through the touch screen (4), the parameters including the scraper (3) movement speed, image acquisition frequency and particle size threshold; (3) Slurry injection: injecting the lithium-ion battery negative electrode slurry into the detection groove (21) of the scraper (2); (4) Scraping and detection: The control system drives the driving assembly according to a preset speed parameter, driving the scraper (3) to move along the length direction of the detection groove (21) to scrape the slurry surface; at the same time, the image acquisition device collects image information of the slurry at a preset frequency, and the laser micrometer synchronously detects the particle size data of the slurry; (5) Data analysis and result output: The control system receives image information and particle size data, identifies the particle size distribution through built-in analysis software, and compares it with the preset threshold value; if the test result exceeds the threshold value, the control system triggers an over-standard warning; if the test result is qualified, a test report containing the particle size distribution, test time and equipment number is automatically generated and stored locally or displayed on the touch screen (4).

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