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

Abstract

The utility model discloses an on-line measuring device for viscosity and density of battery slurry. 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 utility model has the effects that the 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] This utility model relates to the field of industrial automation technology, and in particular to an online measurement device for the viscosity and density of battery slurry. Background Technology

[0002] Battery slurry is a complex suspension with numerous formulations. Online measurement of its rheological parameters, such as viscosity and density (solid content), is crucial for battery production. A key step in slurry production is stirring. However, the distance between the stirring paddle and the tank wall is very small. Therefore, viscosity sensors installed on the tank typically employ a recessed design to avoid scraping from the stirring paddle. Due to the problem of limited slurry exchange caused by slurry accumulation in the recessed area, this design is rarely used in practical applications.

[0003] Currently, the sensors for online slurry measurement are generally installed on the bypass, and the slurry to be tested is pumped in periodically to complete the measurement. This method is not only expensive, but also complicated to operate and control. Therefore, there is an urgent need to design a new type of measuring device to realize online measurement of slurry viscosity and density. Utility Model Content

[0004] To address one or more of the aforementioned problems, this invention provides an online measurement device for battery slurry viscosity and density.

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

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

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

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

[0009] The drive module is connected to the piston cylinder and is used to drive the piston cylinder to reciprocate; the viscosity density sensor enters or retracts into the tank periodically with the piston cylinder;

[0010] The flushing module includes pipes, valves, a liquid pump, and a liquid collection tank. The cavity has an inlet and an outlet at both ends. The inlet is connected to one end of the liquid pump through a pipe, and the outlet is connected to one end of the liquid collection tank through a pipe. The other end of the liquid pump is connected to the other end of the liquid collection tank.

[0011] In some implementations, a lower-level computer, a higher-level computer, and a temperature sensor are also included, wherein the temperature sensor is installed inside the viscosity density sensor, one lower-level computer is connected to one or more viscosity density sensors, and multiple lower-level computers are connected to the higher-level computer to realize bidirectional data transmission.

[0012] In some implementations, the lower-level computer can control valves and liquid pumps to periodically flush the inside of the cavity.

[0013] In some implementations, the viscosity density sensor is a vibration sensor;

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

[0015] In some embodiments, the cavity is a cylindrical structure with a cylindrical first cavity inside and an opening at the top. A sealing ring is provided around the inside 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, and a frustum is set at the lower end of the cavity bottom cover, with a first through hole in the middle;

[0017] A step is provided on the outside of the top of the cavity to connect to the tank wall of the slurry mixing tank.

[0018] In some embodiments, a cylindrical second cavity is provided inside the piston cylinder, and a circular piston boss is provided on the outside. One or more sealing rings are installed on the outer circular surface of the piston boss so that the piston cylinder remains sealed 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 sealed 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 drive module includes a nut, a drive gear, and a motor; the outer circle of the piston cylinder is provided with an external thread that engages with the nut; a stop cap is provided on the surface of the cavity bottom cover away from the cylindrical first cavity; the nut is installed between the cavity bottom cover and the stop cap; the outer circle of the nut is gear-shaped and engages with the drive gear; the output shaft of the motor is fixedly connected to the drive gear; the stop cap is barrel-shaped with a hollowed-out barrel wall; a second through hole is provided at the bottom of the barrel; the diameter of the second through hole is smaller than the outer diameter of the piston cylinder; and the height of the barrel wall is greater than the thickness of the nut.

[0021] In some implementations, the drive module is an electric actuator or a push-pull electromagnet, and the piston cylinder is coaxially mounted with the electric actuator or push-pull electromagnet.

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

[0023] The advantages of an online battery slurry viscosity density measuring device are: firstly, it adopts a specially designed sensor position control mechanism to control the sensor to enter and exit the tank according to the production stage of the slurry, thus avoiding possible scraping between the agitator and the sensor during stirring. This design eliminates the need for recesses in the tank, thus solving the problem of slurry accumulation on the sensor surface. Secondly, because the sensor extends into the tank to measure slurry properties, and dynamic calibration is used, the accuracy and representativeness of the measurement are greatly improved. Thirdly, installation only requires drilling holes in the bottom or side wall of the tank, avoiding expensive pipeline modifications and valve controls, resulting in low installation costs, short equipment modification cycles, and minimal impact on production. Furthermore, installing the measuring device in the tank saves slurry wasted in bypass pipelines, simplifies production inspection steps, and improves production efficiency. Fourthly, good sealing is maintained during and after movement, ensuring no slurry leakage from the tank. Fifthly, when the sensor retracts into the cavity, slurry remains in the cavity. If the mixing tank is not in operation for a long period, the flushing module flushes the vibrating components of the sensor to ensure normal sensor operation. If the mixing tank is in continuous production, the slurry accumulated in the cavity will be pushed out of the cavity by the piston cylinder. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an online battery slurry viscosity and density measurement device according to one embodiment of the present invention;

[0025] Figure 2 for Figure 1 A left-side schematic diagram of an online viscosity and density measurement device for battery slurry is shown.

[0026] Figure 3 This is a schematic diagram of the measuring device of this utility model when a piston cylinder sealing method is used;

[0027] Figure 4 This is a schematic diagram of the measuring device of this utility model using a threaded screw drive;

[0028] Figure 5 This is a schematic diagram of the measuring device of this utility model using a bottom cover sealing method;

[0029] Figure 6 This is a schematic diagram of the measuring device system of this utility model;

[0030] Figure 7 This is a flowchart of the detection method of the measuring device of this utility model;

[0031] Figure 8 This is a flowchart of the dynamic calibration process for the measuring device of this utility model.

[0032] Cavity 1, first cavity 11, opening 12, sealing ring 13, cavity bottom cover 14, frustum 15, first through hole 16, tank wall 17, second through hole 18;

[0033] Viscosity density sensor 2, head vibration component 21, sensor top cover 22, circuit 23

[0034] Piston cylinder 3, second cavity 31, piston boss 32, piston cylinder cover plate 33;

[0035] Drive module 4, nut 41, drive gear 42, motor 43, external thread 44, electric push rod 45;

[0036] Lower-level computer 5; Upper-level computer 6; Temperature sensor 7;

[0037] The flushing module 8 has an inlet 81 and an outlet 82. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to the directions in the accompanying drawings, while the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0039] Figures 1 to 8 A schematic diagram illustrates an online viscosity density measuring device for battery slurry according to one embodiment of the present invention. As shown in the figure, the device includes: a cavity 1, a viscosity density sensor 2, a piston cylinder 3, a drive module 4, and a flushing module 8;

[0040] The cavity 1 is installed on the tank body of the slurry mixing tank, and the connection between the two is preferably by welding or screw fixing. A preferred structure of the cavity 1 is as follows: the cavity 1 is a cylindrical structure with a cylindrical first cavity 11 inside and an opening 12 at the top. A sealing ring 13 is provided on the inner circumference of the opening 12. A cavity bottom cover 14 is installed at the bottom of the cavity 1. A frustum 15 is provided at the lower end of the cavity bottom cover 14. A first through hole 16 is provided in the middle of the bottom cover. A step is provided on the outer side of the top of the cavity 1 to connect to the tank wall 17 of the slurry mixing tank.

[0041] The piston cylinder 3 is installed inside the cavity 1 and maintains a sealed connection with the inner wall of the cavity 1 or the bottom cover 14.

[0042] Viscosity density sensor 2 is installed at the end of piston cylinder 3 facing the tank body; the viscosity density sensor 2 is preferably a vibration sensor, such as a tuning fork sensor, a torsional vibration sensor, or an ultrasonic sensor; a preferred structure of viscosity density sensor 2 is as follows: it includes a head vibration component 21 and a circuit 23. The head vibration component 21 is installed at the end of piston cylinder 3 and fully extends out of the cavity 1 when piston cylinder 3 moves to position I, and fully retracts into the cavity 1 when piston cylinder 3 moves to position II; a sensor top cover 22 is provided at the head of viscosity density sensor 2, and the circuit 23 of viscosity density sensor 2 is installed inside piston cylinder 3. When the sensor retracts 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.

[0043] Drive module 4 is connected to piston cylinder 3 and is used to drive piston cylinder reciprocating motion; viscosity density sensor 2 enters the tank or returns to cavity 1 periodically with piston cylinder 3;

[0044] The flushing module 8 includes pipes, valves, a liquid pump, and a liquid collection tank. The cavity 1 is provided with an inlet 81 and an outlet 82 at both ends. The inlet 81 is connected to one end of the liquid pump through a pipe, and the outlet 82 is connected to one end of the liquid collection tank through a pipe. The other end of the liquid pump is connected to the other end of the liquid collection tank.

[0045] The advantages of an online battery slurry viscosity density measuring device are: firstly, it adopts a specially designed sensor position control mechanism to control the sensor to enter and exit the tank according to the production stage of the slurry, thus avoiding possible scraping between the agitator and the sensor during stirring. This design eliminates the need for recesses in the tank, thus solving the problem of slurry accumulation on the sensor surface. Secondly, because the sensor extends into the tank to measure slurry properties, and dynamic calibration is used, the accuracy and representativeness of the measurement are greatly improved. Thirdly, installation only requires drilling holes in the bottom or side wall of the tank, avoiding expensive pipeline modifications and valve controls, resulting in low installation costs, short equipment modification cycles, and minimal impact on production. Furthermore, installing the measuring device in the tank saves slurry wasted in bypass pipelines, simplifies production inspection steps, and improves production efficiency. Fourthly, good sealing is maintained during and after movement, ensuring no slurry leakage from the tank. Fifthly, when the sensor retracts into the cavity, slurry remains in the cavity. If the mixing tank is not in operation for a long period, the flushing module flushes the vibrating components of the sensor to ensure normal sensor operation. If the mixing tank is in continuous production, the slurry accumulated in the cavity will be pushed out of the cavity by the piston cylinder.

[0046] In some implementations, such as Figure 4As shown, the system also includes a lower-level machine 5, a higher-level machine 6, and a temperature sensor 7. The temperature sensor 7 is installed inside the viscosity density sensor 2. One lower-level machine 5 connects to one or more viscosity density sensors 2, and all lower-level machines 5 are connected to the higher-level machine 6. The connection method between the lower-level machines 5 and the higher-level machine 6 is preferably wired or wireless, enabling bidirectional data transmission. Preferably, when the slurry production interval is long, the lower-level machine 5 can control the valves and liquid pumps to flush the inside of the cavity 1 after the slurry is emptied from the tank, ensuring that the slurry does not solidify on the sensor surface and affect the measurement results in the next measurement. Its advantages are: this setup enables automated control, saves manpower, and improves production efficiency; simultaneously, given the large number of sensors, the lower-level machine and the higher-level machine can be combined, reducing system layers.

[0047] Furthermore, a cylindrical second cavity 31 is provided inside the piston cylinder 3, and a circular piston boss 32 is provided on the outside. One or more sealing rings are installed on the outer surface of the piston boss 32, so that the piston cylinder remains sealed with the inner wall of the cavity 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. The beneficial effect is that by setting the sealing rings, the piston boss 52 and the surface of the cavity 1 are kept in a protective seal during the axial movement of the piston cylinder 3 within the cavity 1. With this structure, during the reciprocating motion of the piston cylinder, the slurry only enters the cavity between position I and the piston boss 32. The cavity between the piston boss 32 and the bottom cover 14 of the cavity is empty of slurry and is connected to the outside atmosphere. The beneficial effect is that each reciprocating motion of the piston cylinder pushes out the slurry that entered the cavity last time, ensuring that the slurry in the cavity is renewed in a timely manner and is not easily solidified.

[0048] Furthermore, the drive module 4 includes a nut 41, a drive gear 42, and a motor 43. The outer circumference of the piston cylinder 3 is provided with an external thread 44 that engages with the nut 41. A stop cap 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 stop cap. The outer circumference of the nut 41 is gear-shaped and engages with the drive gear 42. The output shaft of the motor 43 is fixedly connected to the drive gear 42. The stop cap is barrel-shaped with a hollowed-out wall and a second through hole 18 at the bottom. The diameter of the second through hole 18 is smaller than the outer diameter 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 stop cap provides support for the nut 41. The beneficial effect of this structure is that the axial length of the measuring device is greatly reduced, allowing for installation and use in space-constrained production environments.

[0049] Preferably, the drive module 4 is an electric push rod 45 or a push-pull electromagnet, and the piston cylinder 3 is coaxially mounted with the electric push rod 45 or the push-pull electromagnet, so as to realize the reciprocating motion of the piston cylinder efficiently and stably. Its advantages are: the drive module has a simple structure, easy operation, and high integration and reliability.

[0050] In some implementations, such as Figure 5 As shown, one or more sealing rings are provided on the inner surface of the first through hole 16 of the cavity bottom cover 14 to form a sealed installation with the outer circumferential surface of the piston cylinder. A gap is provided between the piston cylinder boss and the inner wall of the cavity to allow the slurry to 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. Therefore, if cleaning solvent is pre-injected into the cavity, it will have a cleaning effect on the returned sensor. Then, by periodically updating the cleaning solvent in the cavity through the cleaning module, the frequency of device cleaning can be reduced.

[0051] like Figures 6 to 8 As shown, this utility model also provides a detection method, a detection method using the above-mentioned online viscosity and density measurement device for battery slurry, comprising the following steps:

[0052] S1: Cavity 1 is installed on the tank body of the slurry mixing tank, and viscosity density sensor 2 is located inside cavity 1; cavity 1 can be installed on the side wall or bottom of the tank body;

[0053] S2: Raw materials are poured into the mixing tank and mixing begins. After mixing is complete, the mixing paddle stops rotating. The position where the mixing paddle stops is offset from the position where the sensor is installed.

[0054] S3: The drive module 4 pushes the piston cylinder 3 out of the cavity 1, allowing the viscosity density sensor 2 to enter the tank; the sensor (such as the vibrating component of a vibration sensor) comes into full contact with the slurry;

[0055] S4: Measure the viscosity, density, and temperature of the slurry;

[0056] S5: Determine whether viscosity density sensor 2 needs dynamic calibration based on the production batch of the same formula slurry in this 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.

[0057] S6: If the viscosity density sensor 2 has not completed dynamic calibration, then perform dynamic calibration based on the difference between online and offline data;

[0058] S7: If the viscosity density sensor 2 has completed dynamic calibration, determine whether the measured viscosity of the slurry is within the standard range. If it meets the standard, the slurry in the tank is transported to the next production stage, and the piston cylinder 3 drives the sensor back to the chamber 1. If it does not meet the viscosity control standard, a sample needs to be taken for verification.

[0059] S8: Randomly sample and measure the viscosity and density of the slurry offline, and compare the results with those measured online;

[0060] S9: Proceed to step S2 loop.

[0061] like Figure 7As shown, preferably, in the above implementation method, the sensor dynamic calibration includes the following steps:

[0062] S1: The sensor completes the measurement and acquires the measurement data obtained;

[0063] S2: Slurry sampling. Samples are measured offline using laboratory instruments to obtain sample data.

[0064] S3: Obtain the sensor's conversion coefficient by looking up the table based on the slurry type. The conversion coefficient is either the sensor's calibration coefficient or the calculated coefficient.

[0065] S4: Adjust the sensor conversion coefficient based on the difference between the measured data and the sample data and store it.

[0066] The beneficial effects of this online detection method for battery slurry viscosity and density are as follows: First, the specially designed sensor position control mechanism controls the sensor's entry and exit from the tank according to the slurry's production stage, avoiding potential scraping between the sensor and the agitator during stirring. This design eliminates the need for creating 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 a dynamic sensor calibration method is used, the accuracy and representativeness of the measurement are greatly improved. Third, it has minimal impact on production, simplifies production inspection steps, and improves production efficiency.

[0067] like Figures 6 to 8 As shown, preferably, the system also includes a lower-level machine 5, a higher-level machine 6, and a temperature sensor 7, wherein the temperature sensor 7 is installed inside the viscosity density sensor 2, one lower-level machine 5 is connected to one or more viscosity density sensors 2, and multiple lower-level machines 5 are all connected to the higher-level machine 6 to achieve bidirectional data transmission. The optimized measurement method steps are as follows:

[0068] S1: Cavity 1 is installed on the tank body of the slurry mixing tank, and viscosity density sensor 2 is located inside cavity 1;

[0069] S2: Raw materials are injected into the mixing tank and mixing begins. After mixing is completed, the mixing paddle stops rotating, and the host computer 6 sends control information to the slave computer 5.

[0070] S3: After receiving the control information from the host computer 6, the lower computer 5 controls the drive 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.

[0071] S4: Viscosity density sensor 2 measures the viscosity, density and temperature of the slurry and sends the data to the lower computer 5, which in turn sends it to the upper computer 6;

[0072] S5: Based on the production batch of the same formula slurry in this tank (usually the data from the first 5 productions of the same formula slurry in the same tank is used for dynamic calibration of the sensor), the lower-level machine 5 determines whether the viscosity density sensor 2 needs dynamic calibration.

[0073] S6: If the viscosity density sensor 2 has not completed dynamic calibration, the offline data is sent to the lower-level machine 5 in batches. The lower-level machine 5 performs dynamic calibration based on the difference between the online and offline data.

[0074] S7: If the viscosity density sensor 2 has completed dynamic calibration, the host computer 6 determines whether the measured slurry viscosity is within the standard range. If it meets the standard, it controls the feeding valve to open and transport the slurry in the tank to the next production stage. The slave 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 host computer issues a sampling notice, and on-site personnel take samples for offline measurement and verification.

[0075] S8: Randomly sample and measure the viscosity and density of the slurry offline, and compare the results with those measured online;

[0076] S9: Proceed to step S2 loop.

[0077] Preferably, in the above measurement method, when the viscosity density sensor 2 is a vibration sensor, the difference is as follows:

[0078] In measurement step S1, cavity 1 is installed on the tank body of slurry mixing tank, viscosity density sensor 2 is located in the internal cavity of cavity 1, and sensor top cover seals and blocks the top through hole 12 of cavity 1.

[0079] In measurement step S3, after receiving the control information from the host computer 6, the lower computer 5 controls the drive 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 tank.

[0080] like Figure 8 As shown, the sensor dynamic calibration optimization in the above implementation method includes the following steps:

[0081] S1: The sensor completes the measurement and acquires the measurement data, and transmits the measurement data (viscosity η1, density ρ1 and temperature value) to the lower computer 5. The lower computer 5 transmits the online data to the upper computer 6.

[0082] S2: The host computer 6 issues a command to sample the slurry. The sample is measured offline using laboratory instruments (such as a rotational viscometer) to obtain sample data (viscosity η2, density ρ2, and temperature value).

[0083] S3: The host computer 6 sends offline measurement data and slurry type to the slave computer. The slave computer 5 looks up the conversion coefficient of the sensor according to the slurry type. The conversion coefficient is the calibration coefficient or calculation coefficient of the sensor.

[0084] S4: The lower-level machine 5 adjusts and stores the sensor conversion coefficient based on the difference (η1-η2, ρ1-ρ2) between the measurement data and the sample data.

[0085] The beneficial effects of this online detection method for battery slurry viscosity and density are as follows: First, the setup enables automated control, saving manpower and improving production efficiency. Second, the specially designed sensor position control mechanism controls the sensor's entry and exit from the tank according to the slurry's production stage, avoiding potential scraping between the agitator and the sensor during stirring. This design eliminates the need for creating 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 a dynamic sensor calibration method is used, the accuracy and representativeness of the measurement are greatly improved. Fourth, it has minimal impact on production, simplifies production inspection steps, and improves production efficiency.

[0086] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A battery slurry viscosity density on-line measuring device, characterized by, The application relates to a slurry viscosity and density sensor. The application comprises a cavity (1), a viscosity and density sensor (2), a piston cylinder (3), a driving module (4) and a flushing module (8). The cavity (1) is installed on a slurry stirring tank body. The piston cylinder (3) is installed in the cavity (1). The viscosity and density sensor (2) is installed at the end of the piston cylinder (3) towards the tank body. The driving module (4) is connected with the piston cylinder (3) and is used for driving the piston cylinder to reciprocate; the viscosity and 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 pipes, valves, a liquid pump and a liquid storage tank; liquid inlets (81) and liquid outlets (82) are arranged at the two ends of the cavity (1) respectively; one end of the liquid pump is connected with the liquid inlet (81) through the pipe; one end of the liquid storage tank is connected with the liquid outlet (82) through the pipe; and the other end of the liquid pump is connected with the other end of the liquid storage tank.

2. The on-line battery slurry viscosity and density measuring device according to claim 1, wherein, The application further comprises a lower computer (5), an upper computer (6) and a temperature sensor (7); the temperature sensor (7) is installed in the viscosity and density sensor (2); one lower computer (5) is connected with one or more viscosity and density sensors (2); and the plurality of lower computers (5) are connected with the upper computer (6) to realize bidirectional data transmission.

3. The on-line battery slurry viscosity and density measuring device according to claim 2, wherein, The lower computer (5) can control the valves and the liquid pump to periodically flush the inside of the cavity (1).

4. The online battery slurry viscosity and density measuring device according to claim 1, wherein, The viscosity and density sensor (2) is a vibration sensor. The viscosity and density sensor (2) comprises 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 completely extends out of the cavity (1) when the piston cylinder (3) moves to position I and completely retreats into the cavity (1) when the piston cylinder (3) moves to position II; a sensor top cover (22) is arranged at the head of the viscosity and density sensor (2); and the circuit (23) of the viscosity and density sensor (2) is installed in the piston cylinder (3).

5. The on-line battery slurry viscosity and density measuring device according to claim 4, wherein, The vibration sensor is a tuning fork sensor, a torsional vibration sensor or an ultrasonic sensor.

6. The on-line battery slurry viscosity and density measuring device according to claim 1, wherein, The cavity (1) is a cylindrical structure, internally provided with a cylindrical first cavity (11) and provided with an opening (12) at the top; a sealing ring (13) is arranged at the inner periphery of the opening (12) to form a sealing connection with the sensor top cover (22); A cavity bottom cover (14) is installed at the bottom of the cavity (1); a circular 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 of the cavity bottom cover (14). A step is arranged at the top of the cavity (1) to connect the tank wall (17) of the slurry stirring tank.

7. The on-line battery slurry viscosity and density measuring device according to claim 6, wherein, A cylindrical second cavity (31) is arranged in the piston cylinder (3); a circular piston boss (32) is arranged outside the piston cylinder (3); one or more sealing rings are installed on the outer circular surface of the piston boss (32) to make the piston cylinder (3) keep sealing with the inner wall of the cavity (1) during reciprocation; and a piston cylinder cover plate (33) is installed at the end of the piston cylinder (3) opposite to the piston boss (32).

8. The on-line battery slurry viscosity and density measuring device according to claim 7, wherein, The first through hole (16) of the cavity bottom cover (14) is provided with one or more sealing rings, which are in sealing installation with the outer circumferential surface of the piston cylinder (3), and the piston boss (32) is in clearance fit with the inner wall of the cavity (1).

9. The on-line battery slurry viscosity and density measuring device according to any one of claims 1-8, characterized in that, The driving module (4) comprises a screw cap (41), a driving gear (42) and a motor (43); the outer circle of the piston cylinder (3) is provided with an outer thread (44) which is in thread cooperation with the screw cap (41), the surface of the cavity bottom cover (14) away from the cylindrical first cavity (11) is provided with a stopper circular cover, the screw cap (41) is installed between the cavity bottom cover (14) and the stopper circular cover, the outer circle of the screw cap (41) is provided in the shape of a gear and is in cooperation with the driving gear (42), the output shaft of the motor (43) is fixedly connected with the driving gear (42), the stopper circular cover is provided in the shape of a barrel, the barrel wall is hollow, 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 piston cylinder (3), and the height of the barrel wall is greater than the thickness of the screw cap.

10. The on-line battery slurry viscosity and density measuring device according to any one of claims 1-8, wherein, 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.

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