On-line measuring device for viscosity and density of battery slurry and detection method thereof

Abstract

The invention discloses an on-line measuring device for viscosity and density of battery slurry and a detection method of the on-line measuring device. The online measuring device comprises a cavity, a viscosity density sensor, a piston cylinder, a driving module and a flushing module, the cavity is mounted on a slurry stirring tank body; the piston cylinder is mounted in the cavity; the viscosity and density sensor is mounted at the end, facing the tank body, of the piston barrel; the driving module is connected with the piston cylinder and used for driving the piston cylinder to reciprocate; the viscosity and density sensor periodically enters the tank body or returns to the cavity along with the piston cylinder; the flushing module flushes the cavity and the surface of the viscosity density sensor. The device has the advantages that slurry is not accumulated on the surface of the sensor, the measurement accuracy and representativeness are high, the installation cost is low, and the production efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial automation, and in particular to an online measurement device for battery slurry viscosity density and a detection method thereof. Background Art

[0002] Battery slurry is a complex suspension liquid with many formulas. Online measurement of its rheological parameters such as viscosity and density (solid content) is of great significance to battery production. The key link in slurry production is stirring, and the distance between the stirring paddle and the tank wall in the stirring tank is very small. Therefore, the viscosity sensor installed on the tank body generally adopts a pit design, and the sensor is installed in the pit of the tank body to avoid scratching by the stirring paddle. Due to the problem of less accumulation and exchange of slurry in the pit, it has been rarely used in practical applications.

[0003] At present, sensors for online measurement of slurry are generally installed on the bypass, and then the slurry to be measured is pumped in regularly to complete the measurement. This method is not only expensive, but also complicated to operate and control. Therefore, it is urgent to design a new measuring device to realize online measurement of slurry viscosity and density. Summary of the invention

[0004] In order to solve one or more of the above problems, the present invention provides an online measurement device for battery slurry viscosity and density.

[0005] According to one aspect of the present invention, a battery slurry viscosity density online measurement device comprises: a cavity, a viscosity density sensor, a piston cylinder, a driving module and a flushing module;

[0006] The cavity is installed on the body of the slurry mixing tank;

[0007] The piston cylinder is installed in the cavity;

[0008] The viscosity density sensor is installed at the end of the piston cylinder facing the tank body;

[0009] The driving module is connected to the piston cylinder and is used to drive the piston cylinder to reciprocate; the viscosity density sensor periodically enters the tank body or returns to the cavity along with the piston cylinder;

[0010] The flushing module includes a pipeline, a valve, a liquid pump and a liquid storage tank. A liquid inlet and a liquid outlet are respectively arranged at both ends of the cavity. The liquid inlet is connected to one end of the liquid pump through a pipeline, the liquid outlet is connected to one end of the liquid storage tank through a pipeline, and the other end of the liquid pump is connected to the other end of the liquid storage tank.

[0011] In some embodiments, it also includes a lower computer, an upper computer and a temperature sensor, wherein the temperature sensor is installed inside the viscosity density sensor, one lower computer is connected to one or more viscosity density sensors, and multiple lower computers are connected to the upper computer to achieve two-way data transmission;

[0012] Or the lower computer can control the valve and liquid pump to flush the inside of the cavity regularly.

[0013] In some embodiments, the viscosity density sensor is a vibrating sensor;

[0014] The viscosity density sensor includes a head vibration component and a circuit. The head vibration component is installed at the end of the piston cylinder and fully extends out of the cavity when the piston cylinder moves to position I, and fully retracts into the cavity when the piston cylinder moves to position II. The head of the viscosity density sensor is provided with a sensor top cover, and the circuit of the viscosity density sensor is installed inside the piston cylinder.

[0015] In some embodiments, the cavity is a cylindrical structure, a cylindrical first cavity is arranged inside and an opening is provided at the top, and a sealing ring is arranged around the inner circumference of the opening to form a sealed connection with the sensor top cover;

[0016] A cavity bottom cover is installed at the bottom of the cavity, a truncated cone is arranged at the lower end of the cavity bottom cover, and a first through hole is arranged in the middle;

[0017] A step is arranged outside the top of the cavity to connect to the tank wall of the slurry stirring tank.

[0018] In some embodiments, a cylindrical second cavity is provided inside the piston cylinder, and a circular piston boss is provided outside. One or more sealing rings are installed on the outer circular surface of the piston boss so that the piston cylinder maintains a seal with the inner wall of the cavity during reciprocating motion. A piston cylinder cover plate is installed on the end of the piston cylinder opposite to the piston boss.

[0019] In some embodiments, one or more sealing rings are provided on the inner circumferential surface of the first through hole of the cavity bottom cover to form a sealing installation with the outer circumferential surface of the piston cylinder, and the piston boss is clearance-fitted with the inner wall of the cavity.

[0020] In some embodiments, the driving module includes a nut, a driving gear and a motor; the outer circle of the piston cylinder is provided with an external thread that cooperates with the nut thread, the surface of the cavity bottom cover away from the cylindrical first cavity is provided with a stop round cover, and the nut is installed between the cavity bottom cover and the stop round cover, the outer circle of the nut is set to a gear shape and cooperates with the driving gear, the output shaft of the motor is fixedly connected to the driving gear, the stop round cover is set to a barrel shape, the barrel wall is hollowed out, and a second through hole is set at the bottom of the barrel, the diameter of the second through hole is smaller than the outer diameter of the cylinder of the piston cylinder, and the height of the barrel wall is greater than the thickness of the nut.

[0021] In some embodiments, the driving module is an electric push rod or a push-pull electromagnet, and the piston cylinder is coaxially mounted with the electric push rod or the push-pull electromagnet;

[0022] Or the vibration sensor is a tuning fork sensor, a torsional vibration sensor or an ultrasonic sensor.

[0023] The beneficial effects of an online measurement device for battery slurry viscosity density are: first, a specially designed sensor position control mechanism is used to control the sensor to enter and exit the tank according to the production stage of the slurry, thereby avoiding possible scratching of the sensor by the stirring paddle during stirring. This design does not require making pits on the tank body, thus solving the problem of slurry accumulation on the sensor surface; secondly, since the sensor extends into the tank body to measure the properties of the slurry and adopts a dynamic calibration sensor method, the accuracy and representativeness of the measurement are greatly improved; thirdly, it only needs to be installed by drilling holes on the bottom or side wall of the tank body, avoiding expensive pipeline modifications and valve controls, so the installation cost is low, the equipment modification cycle is short, and the impact on production is small. At the same time, installing the measuring device on the tank body can save the slurry wasted in the bypass pipeline, simplify the production inspection steps, and improve production efficiency; fourthly, during the movement and when the movement stops, it can ensure good sealing to ensure that the slurry in the tank does not leak; fifthly, when the sensor is retracted into the cavity, slurry will remain in the cavity inside the cavity. If the mixing tank does not work for a long time, the flushing module flushes the vibrating parts of the sensor to ensure the normal operation of the sensor. If the mixing tank is continuously produced, the slurry accumulated in the cavity of the cavity will be pushed out of the cavity by the piston cylinder.

[0024] The present invention also provides a detection method, a detection method using the above battery slurry viscosity density online measurement device, comprising the following steps:

[0025] S1: The cavity is installed on the tank body of the slurry mixing tank, and the viscosity density sensor is located inside the cavity;

[0026] S2: The raw materials are poured into the mixing tank and the mixing starts. After the mixing is completed, the stirring paddle stops rotating;

[0027] S3: The driving module pushes the piston cylinder out of the cavity, so that the viscosity density sensor enters the tank;

[0028] S4: Measure the viscosity, density and temperature of the slurry;

[0029] S5: Determine whether the viscosity density sensor needs dynamic calibration based on the production batch of the same formula slurry in this tank;

[0030] S6: If the viscosity density sensor has not completed dynamic calibration, dynamic calibration is performed based on the difference between online and offline data;

[0031] S7: If the viscosity density sensor has completed dynamic calibration, determine whether the measured slurry viscosity is within the standard range. If it meets the standard, the slurry in the tank will be transported to the next production link, and the piston cylinder will drive the sensor back to the cavity; if it does not meet the viscosity control standard, sampling is required for verification;

[0032] S8: Occasionally sample and measure the viscosity and density of the slurry offline and compare the results of online measurement;

[0033] S9: Go to step S2 and loop.

[0034] In the above implementation method, the sensor dynamic calibration includes the following steps:

[0035] S1: The sensor completes the measurement and obtains the measured data;

[0036] S2: Slurry sampling, the sample is measured offline using laboratory instruments to obtain sample data;

[0037] S3: Obtain the conversion coefficient of the sensor by looking up the table according to the slurry type, and the conversion coefficient is the calibration coefficient or calculation coefficient of the sensor;

[0038] S4: Adjust the sensor conversion coefficient according to the direct difference between the measurement data and the sample data and store it. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of an online measurement device for battery slurry viscosity density according to one embodiment of the present invention;

[0040] Figure 2 for Figure 1 A left schematic diagram of an online battery slurry viscosity density measurement device is shown;

[0041] Figure 3 It is a schematic diagram of the measuring device of the present invention when the piston cylinder sealing method is adopted;

[0042] Figure 4 A schematic diagram of a measuring device of the present invention driven by a threaded screw;

[0043] Figure 5 It is a schematic diagram of the measuring device of the present invention adopting the bottom cover sealing method;

[0044] Figure 6 It is a schematic diagram of the measuring device system of the present invention;

[0045] Figure 7 is a flow chart of a detection method of a measuring device of the present invention;

[0046] Figure 8 It is a dynamic calibration flow chart of the measuring device of the present invention.

[0047] Cavity 1, first cavity 11, opening 12, sealing ring 13, cavity bottom cover 14, truncated cone 15, first through hole 16, tank wall 17, second through hole 18;

[0048] Viscosity density sensor 2, head vibration component 21, sensor top cover 22, circuit 23,

[0049] Piston cylinder 3, second cavity 31, piston boss 32, piston cylinder cover plate 33;

[0050] Driving module 4, nut 41, driving gear 42, motor 43, external thread 44, electric push rod 45;

[0051] Lower computer 5; upper computer 6; temperature sensor 7;

[0052] Flushing module 8 , liquid inlet 81 , liquid outlet 82 . DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0054] Figures 1 to 8 A battery slurry viscosity density online measurement device according to an embodiment of the present invention is schematically shown. As shown in the figure, the device comprises: a cavity 1, a viscosity density sensor 2, a piston cylinder 3, a driving module 4 and a flushing module 8;

[0055] The cavity 1 is installed on the body of the slurry stirring tank, and the connection between the two is preferably welding or screw fixing. A preferred structure of the cavity 1 is: the cavity 1 is a cylindrical structure, a cylindrical first cavity 11 is arranged inside, and an opening 12 is arranged on the top, a sealing ring 13 is arranged on the inner circumference of the opening 12, a cavity bottom cover 14 is installed at the bottom of the cavity 1, a truncated table 15 is arranged at the lower end of the cavity bottom cover 14, a first through hole 16 is arranged in the middle of the bottom cover, and a step is arranged outside the top of the cavity 1 to connect to the tank wall 17 of the slurry stirring tank.

[0056] The piston cylinder 3 is installed in the cavity 1 and maintains a sealed connection with the inner wall of the cavity 1 or the bottom cover 14;

[0057] The viscosity density sensor 2 is installed at the end of the piston cylinder 3 facing the tank body; the viscosity density sensor 2 is preferably a vibration sensor, such as a tuning fork sensor or a torsional vibration sensor or an ultrasonic sensor; a preferred structure of the viscosity density sensor 2 is: it includes a head vibration component 21 and a circuit 23, the head vibration component 21 is installed at the end of the piston cylinder 3, and fully extends out of the cavity 1 when the piston cylinder 3 moves to position I, and fully retracts into the cavity 1 when the piston cylinder 3 moves to position II; a sensor top cover 22 is set at the head of the viscosity density sensor 2, and the circuit 23 of the viscosity density sensor 2 is installed inside the piston cylinder 3. When the sensor is retracted into the cavity, the sensor top cover 22 can seal the opening of the cylinder body, reduce the influence of the cylinder body pressure on the sensor, and at the same time protect the sensor vibration component.

[0058] The driving module 4 is connected to the piston cylinder 3 and is used to drive the piston cylinder to reciprocate; the viscosity density sensor 2 periodically enters the tank body or returns to the cavity 1 along with the piston cylinder 3;

[0059] The flushing module 8 includes pipes, valves, a liquid pump and a liquid storage tank. A liquid inlet 81 and a liquid outlet 82 are respectively provided at both ends of the cavity 1. The liquid inlet 81 is connected to one end of the liquid pump through a pipe, the liquid outlet 82 is connected to one end of the liquid storage tank through a pipe, and the other end of the liquid pump is connected to the other end of the liquid storage tank.

[0060] The beneficial effects of an online measurement device for battery slurry viscosity density are: first, a specially designed sensor position control mechanism is used to control the sensor to enter and exit the tank according to the production stage of the slurry, thereby avoiding possible scratching of the sensor by the stirring paddle during stirring. This design does not require making pits on the tank body, thus solving the problem of slurry accumulation on the sensor surface; secondly, since the sensor extends into the tank body to measure the properties of the slurry and adopts a dynamic calibration sensor method, the accuracy and representativeness of the measurement are greatly improved; thirdly, it only needs to be installed by drilling holes on the bottom or side wall of the tank body, avoiding expensive pipeline modifications and valve controls, so the installation cost is low, the equipment modification cycle is short, and the impact on production is small. At the same time, installing the measuring device on the tank body can save the slurry wasted in the bypass pipeline, simplify the production inspection steps, and improve production efficiency; fourthly, during the movement and when the movement stops, it can ensure good sealing to ensure that the slurry in the tank does not leak; fifthly, when the sensor is retracted into the cavity, slurry will remain in the cavity inside the cavity. If the mixing tank does not work for a long time, the flushing module flushes the vibrating parts of the sensor to ensure the normal operation of the sensor. If the mixing tank is continuously produced, the slurry accumulated in the cavity of the cavity will be pushed out of the cavity by the piston cylinder.

[0061] In some embodiments, Figure 4 As shown, it also includes a lower computer 5, an upper computer 6 and a temperature sensor 7, wherein the temperature sensor 7 is installed inside the viscosity density sensor 2, one lower computer 5 is connected to one or more viscosity density sensors 2, and multiple lower computers 5 are connected to the upper computer 6, and the connection mode of multiple lower computers 5 to the upper computer 6 is preferably wired connection or wireless connection to realize two-way transmission of data. Preferably, when the slurry production interval is long, the lower computer 5 can control the valve and the liquid pump to flush the inside of the cavity 1 after the tank is emptied of the slurry to ensure that the slurry will not solidify on the sensor surface and thus affect the next measurement effect. Its beneficial effects are: this setting can realize automatic control operations, save manpower, and improve production efficiency; at the same time, according to the large number of sensors, the lower computer and the upper computer can be merged to reduce the system level.

[0062] Further, a cylindrical second cavity 31 is arranged inside the piston cylinder 3, and a circular piston boss 32 is arranged outside. One or more sealing rings are installed on the outer surface of the piston boss 32, so that the piston cylinder is sealed with the inner wall of the cavity when it reciprocates. A piston cylinder cover plate 33 is installed on the end of the piston cylinder 3 opposite to the piston boss 32. Its beneficial effect is that the sealing ring is arranged so that during the axial movement of the piston cylinder 3 in the cavity 1, the piston boss 52 and the surface of the cavity 1 are protected and sealed. Under this structure, when the piston cylinder reciprocates, the slurry only enters the cavity between the position I and the piston boss 32, and the cavity between the piston boss 32 and the cavity bottom cover 14 has no slurry and is connected to the external atmosphere. Its beneficial effect is that each time the piston cylinder reciprocates, the slurry that entered the cavity last time will be pushed out, ensuring that the slurry in the cavity is updated in time and is not easy to solidify.

[0063] Further, the driving module 4 includes a nut 41, a driving gear 42 and a motor 43; the outer circle of the piston cylinder 3 is provided with an external thread 44 that is threadedly matched with the nut 41, the surface of the cavity bottom cover 14 away from the cylindrical first cavity 11 is provided with a stopper cover, and the nut 41 is installed between the cavity bottom cover 14 and the stopper cover, the outer circle of the nut 41 is set in a gear shape and matched with the driving gear 42, the output shaft of the motor 43 is fixedly connected with the driving gear 42, the stopper cover is set in a barrel shape, the barrel wall is hollowed out, and the barrel bottom is provided with a second through hole 18, the diameter of the second through hole 18 is smaller than the outer diameter of the cylinder of the piston cylinder 3, and the height of the barrel wall is greater than the thickness of the nut. When the piston cylinder 3 moves upward, the stopper cover provides support for the nut 41. The beneficial effect of this structure is that the axial length of the measuring device is greatly reduced, and it can be installed and used in a production site with limited space.

[0064] Preferably, the drive module 4 is an electric push rod 45 or a push-pull electromagnet, and the piston cylinder 3 is coaxially installed with the electric push rod 45 or the push-pull electromagnet to achieve the reciprocating motion of the piston cylinder efficiently and stably. The beneficial effects are: the drive module has a simple structure, convenient operation, high integration and reliability.

[0065] In some embodiments, Figure 5 As shown, one or more sealing rings are arranged on the inner surface of the first through hole 16 of the cavity bottom cover 14 to form a sealing installation with the outer cylindrical surface of the piston cylinder. A gap is arranged between the piston cylinder boss and the inner wall of the cavity so that the slurry can pass through. The beneficial effect is that when the piston cylinder reciprocates, most of the liquid in the cavity will not be discharged from the cavity, so if a cleaning solvent is pre-injected into the cavity, it will have a cleaning effect on the returned sensor. Then, by regularly updating the cleaning solvent in the cavity through the cleaning module, the frequency of cleaning the device can be reduced.

[0066] like Figures 6 to 8 As shown, the present invention also provides a detection method, a detection method using the above battery slurry viscosity density online measurement device, comprising the following steps:

[0067] S1: The cavity 1 is installed on the tank body of the slurry stirring tank, and the viscosity density sensor 2 is located inside the cavity 1; the cavity 1 can be installed on the side wall or bottom of the tank body;

[0068] S2: The raw materials are poured into the mixing tank and the mixing begins. After the mixing is completed, the stirring paddle stops rotating. The position where the stirring paddle stops is offset from the position where the sensor is installed.

[0069] S3: The driving module 4 pushes the piston cylinder 3 out of the cavity 1, so that the viscosity density sensor 2 enters the interior of the tank; the sensor (such as the vibration component of the vibration sensor) is in full contact with the slurry;

[0070] S4: Measure the viscosity, density and temperature of the slurry;

[0071] S5: Determine whether the viscosity density sensor 2 needs to be dynamically calibrated according to the production batch of the same formula slurry in the tank; each time a new formula is produced, the sensor needs to be dynamically calibrated for the production of the first 3-5 tanks of slurry;

[0072] S6: If the viscosity density sensor 2 has not completed dynamic calibration, dynamic calibration is performed according to the difference between online and offline data;

[0073] S7: If the viscosity density sensor 2 has completed dynamic calibration, it is determined whether the measured slurry viscosity is within the standard range. If it meets the standard, the slurry in the tank is transported to the next production link, and the piston cylinder 3 drives the sensor back to the cavity 1; if it does not meet the viscosity control standard, sampling is required for verification;

[0074] S8: Occasionally sample and measure the viscosity and density of the slurry offline and compare the results of online measurement;

[0075] S9: Go to step S2 and loop.

[0076] like Figure 7 As shown, preferably, in the above implementation method, the sensor dynamic calibration includes the following steps:

[0077] S1: The sensor completes the measurement and obtains the measured data;

[0078] S2: Slurry sampling, the sample is measured offline using laboratory instruments to obtain sample data;

[0079] S3: Obtain the conversion coefficient of the sensor by looking up the table according to the slurry type, and the conversion coefficient is the calibration coefficient or calculation coefficient of the sensor;

[0080] S4: Adjust the sensor conversion coefficient according to the direct difference between the measurement data and the sample data and store it.

[0081] The beneficial effects of this battery slurry viscosity density online detection method are: first, a specially designed sensor position control mechanism is used to control the sensor to enter and exit the tank according to the production stage of the slurry, avoiding possible scratches between the agitator and the sensor during stirring. This design does not require making pits in the tank, thus solving the problem of slurry accumulation on the sensor surface; second, because the sensor extends into the tank to measure the slurry properties and uses a dynamic calibration sensor method, the accuracy and representativeness of the measurement are greatly improved; third, the impact on production is small, the production inspection steps are simplified, and production efficiency is improved.

[0082] like Figures 6 to 8 As shown, preferably, when the system further includes a lower computer 5, an upper computer 6 and a temperature sensor 7, wherein the temperature sensor 7 is installed inside the viscosity density sensor 2, one lower computer 5 is connected to one or more viscosity density sensors 2, and multiple lower computers 5 are connected to the upper computer 6 to achieve two-way data transmission. The measurement method steps are optimized as follows:

[0083] S1: The cavity 1 is installed on the tank body of the slurry stirring tank, and the viscosity density sensor 2 is located inside the cavity 1;

[0084] S2: The raw materials are poured into the mixing tank and mixing begins. After the mixing is completed, the stirring paddle stops rotating, and the upper computer 6 sends control information to the lower computer 5;

[0085] S3: After receiving the control information from the upper computer 6, the lower computer 5 controls the driving module 4 (such as an electric push rod) to push the piston cylinder 3 out of the cavity 1, so that the viscosity density sensor 2 enters the tank body;

[0086] S4: The viscosity density sensor 2 measures the viscosity, density and temperature of the slurry and sends the data to the slave computer 5, which sends the data to the host computer 6;

[0087] S5: According to the production batches of the same formula slurry of the tank body (usually the data of the first five productions of the slurry of the same formula of the tank body are used for dynamic calibration of the sensor), the lower computer 5 determines whether the viscosity density sensor 2 needs dynamic calibration;

[0088] S6: If the viscosity density sensor 2 has not completed dynamic calibration, the offline data is sent to the lower computer 5 in batches, and the lower computer 5 performs dynamic calibration according to the difference between online and offline data;

[0089] S7: If the viscosity density sensor 2 has completed dynamic calibration, the upper computer 6 determines whether the measured slurry viscosity is within the standard range. If it meets the standard, the material delivery valve is controlled to open to transport the slurry in the tank to the next production link, and the lower computer controls the piston cylinder 3 to drive the sensor back to the cavity 1; if it does not meet the viscosity control standard, the upper computer issues a sampling notice, and the on-site personnel take samples for offline measurement verification;

[0090] S8: Occasionally sample and measure the viscosity and density of the slurry offline and compare the results of online measurement;

[0091] S9: Go to step S2 and loop.

[0092] Preferably, in the above measurement method, when the viscosity density sensor 2 is a vibration sensor, the difference is:

[0093] In the measurement step S1 , the cavity 1 is installed on the tank body of the slurry stirring tank, the viscosity density sensor 2 is located in the inner cavity of the cavity 1 , and the sensor top cover seals and blocks the top through hole 12 of the cavity 1 .

[0094] In the measurement step S3, after receiving the control information from the upper computer 6, the lower computer 5 controls the driving module 4 (such as an electric push rod) to push the piston cylinder 3 out of the cavity 1, so that the head vibration component of the viscosity density sensor 2 enters the interior of the tank.

[0095] like Figure 8 As shown, in the above implementation method, the dynamic calibration optimization of the sensor includes the following steps:

[0096] S1: The sensor completes the measurement and obtains the measured data, and transmits the measured data (viscosity η1, density ρ1 and temperature value) to the lower computer 5, and the lower computer 5 transmits the online data to the upper computer 6;

[0097] S2: The host computer 6 issues an instruction to take slurry samples, and the samples are measured offline using laboratory instruments (such as a rotational viscometer) to obtain sample data (viscosity η2, density ρ2 and temperature value);

[0098] S3: The upper computer 6 sends the offline measurement data and the slurry type to the lower computer. The lower computer 5 obtains the conversion coefficient of the sensor by looking up the table according to the slurry type. The conversion coefficient is the calibration coefficient or calculation coefficient of the sensor.

[0099] S4: The lower computer 5 adjusts the sensor conversion coefficient according to the direct difference between the measurement data and the sample data (η1-η2, ρ1-ρ2) and stores it.

[0100] The beneficial effects of this battery slurry viscosity density online detection method are: first, the setting can realize automatic control operation, save manpower and improve production efficiency; second, a specially designed sensor position control mechanism is used to control the sensor to enter and exit the tank according to the production stage of the slurry, avoiding possible scratches between the agitator and the sensor during stirring. This design does not require making pits in the tank, thus solving the problem of slurry accumulation on the sensor surface; third, because the sensor extends into the tank to measure the slurry properties and uses a dynamic calibration sensor method, the accuracy and representativeness of the measurement are greatly improved; fourth, the impact on production is small, the production inspection steps are simplified, and production efficiency is improved.

[0101] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An online measurement device for battery slurry viscosity and density, characterized in that: include: A cavity (1), a viscosity density sensor (2), a piston cylinder (3), a drive module (4) and a flushing module (8); The cavity (1) is installed on the body of the slurry stirring tank; The piston cylinder (3) is installed in the cavity (1); The viscosity density sensor (2) is installed at the end of the piston cylinder (3) facing the tank body; The driving module (4) is connected to the piston cylinder (3) and is used to drive the piston cylinder to reciprocate; the viscosity density sensor (2) periodically enters the tank body or retreats into the cavity (1) along with the piston cylinder (3); The flushing module (8) comprises a pipeline, a valve, a liquid pump and a liquid storage tank. A liquid inlet (81) and a liquid outlet (82) are respectively arranged at two ends of the cavity (1). The liquid inlet (81) is connected to one end of the liquid pump through a pipeline, the liquid outlet (82) is connected to one end of the liquid storage tank through a pipeline, and the other end of the liquid pump is connected to the other end of the liquid storage tank.

2. The battery slurry viscosity density online measurement device according to claim 1, characterized in that: It also includes a lower computer (5), an upper computer (6) and a temperature sensor (7), wherein the temperature sensor (7) is installed inside the viscosity density sensor (2), one lower computer (5) is connected to one or more viscosity density sensors (2), and a plurality of lower computers (5) are all connected to the upper computer (6) to achieve bidirectional data transmission; Alternatively, the lower computer (5) can control the valve and the liquid pump to regularly flush the interior of the cavity (1).

3. The battery slurry viscosity density online measurement device according to claim 1, characterized in that: The viscosity density sensor (2) is a vibration sensor; The viscosity density sensor (2) comprises a head vibration component (21) and an electric circuit (23); the head vibration component (21) is installed at the end of the piston cylinder (3) and fully extends out of the cavity (1) when the piston cylinder (3) moves to position I, and fully retracts into the cavity (1) when the piston cylinder (3) moves to position II; a sensor top cover (22) is provided at the head of the viscosity density sensor (2), and the electric circuit (23) of the viscosity density sensor (2) is installed inside the piston cylinder (3).

4. The battery slurry viscosity density online measurement device according to claim 1, characterized in that: The cavity (1) is a tubular structure, a cylindrical first cavity (11) is arranged inside and an opening (12) is provided on the top, a sealing ring (13) is arranged on the inner circumference of the opening (12) to form a sealed connection with the sensor top cover (22); A cavity bottom cover (14) is installed at the bottom of the cavity (1), a truncated cone (15) is arranged at the lower end of the cavity bottom cover (14), and a first through hole (16) is arranged in the middle; A step is arranged outside the top of the cavity (1) for connecting to the tank wall (17) of the slurry stirring tank.

5. The battery slurry viscosity density online measurement device according to claim 4, characterized in that: A cylindrical second cavity (31) is arranged inside the piston cylinder (3), and a circular piston boss (32) is arranged outside. One or more sealing rings are installed on the outer surface of the piston boss (32), so that the piston cylinder (3) maintains a seal with the inner wall of the cavity (1) during reciprocating motion. A piston cylinder cover plate (33) is installed on the end of the piston cylinder (3) opposite to the piston boss (32).

6. The battery slurry viscosity density online measurement device according to claim 5, characterized in that: One or more sealing rings are arranged on the inner circumferential surface of the first through hole (16) of the cavity bottom cover (14) to form a sealing installation with the outer circumferential surface of the piston cylinder (3), and the piston boss (32) is clearance-fitted with the inner wall of the cavity (1).

7. An on-line measuring device for viscosity and density of battery slurry according to any one of claims 1 to 6, characterized in that: The driving module (4) comprises a nut (41), a driving gear (42) and a motor (43); the outer circle of the piston cylinder (3) is provided with an external thread (44) which is matched with the thread of the nut (41); a stopper round cover is provided on the surface of the cavity bottom cover (14) away from the cylindrical first cavity (11), and the nut (41) is installed between the cavity bottom cover (14) and the stopper round cover; the outer circle of the nut (41) is provided with a gear shape and is matched with the driving gear (42); the output shaft of the motor (43) is fixedly connected with the driving gear (42); the stopper round cover is provided with a barrel shape, the barrel wall is hollowed out, and a second through hole (18) is provided at the barrel bottom; the diameter of the second through hole (18) is smaller than the outer diameter of the cylinder of the piston cylinder (3), and the height of the barrel wall is greater than the thickness of the nut.

8. An online battery slurry viscosity density measuring device according to any one of claims 1 to 6, characterized in that: The driving module (4) is an electric push rod (45) or a push-pull electromagnet, and the piston cylinder (3) is coaxially installed with the electric push rod (45) or the push-pull electromagnet; Or the vibration sensor is a tuning fork sensor, a torsional vibration sensor or an ultrasonic sensor.

9. A detection method for an online battery slurry viscosity density measurement device as claimed in any one of claims 2 to 8, characterized in that The following steps are involved: S1: The cavity (1) is installed on the tank body of the slurry stirring tank, and the viscosity density sensor (2) is located inside the cavity (1); S2: The raw materials are poured into the mixing tank and the mixing starts. After the mixing is completed, the stirring paddle stops rotating; S3: The driving module (4) pushes the piston cylinder (3) out of the cavity (1), so that the viscosity density sensor (2) enters the interior of the tank; S4: Measure the viscosity, density and temperature of the slurry; S5: judging whether the viscosity density sensor (2) needs dynamic calibration according to the production batch of the slurry with the same formula in the tank; S6: If the viscosity density sensor (2) has not completed dynamic calibration, dynamic calibration is performed according to the difference between online and offline data; S7: If the viscosity density sensor (2) has completed dynamic calibration, it is determined whether the measured slurry viscosity is within the standard range. If it meets the standard, the slurry in the tank is transported to the next production link, and the piston cylinder (3) drives the sensor back to the cavity (1); if it does not meet the viscosity control standard, sampling is required for verification; S8: Occasionally sample and measure the viscosity and density of the slurry offline and compare the results of online measurement; S9: Go to step S2 and loop.

10. The detection method according to claim 9, characterized in that: The dynamic calibration of the sensor includes the following steps: S1: The sensor completes the measurement and obtains the measured data; S2: Slurry sampling, the sample is measured offline using laboratory instruments to obtain sample data; S3: Obtain the conversion coefficient of the sensor by looking up the table according to the slurry type, and the conversion coefficient is the calibration coefficient or calculation coefficient of the sensor; S4: Adjust the sensor conversion coefficient according to the direct difference between the measurement data and the sample data and store it.

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