Online test equipment for electrode powder

Abstract

The invention discloses electrode powder on-line testing equipment which is provided with a material moving device and a testing device, the testing device comprises a funnel and a material carrying assembly, the material carrying assembly comprises a transverse driver and a carrier, the transverse driver drives the carrier to move to the position below the funnel, the material moving device transfers a sagger to the position above the funnel and turns over, and the sagger is driven by the transverse driver to move to the position below the funnel. A first driver of the testing device is matched to drive a crimping end of a first pressure head to be in close contact with the electrode powder and enable a testing probe to be inserted into the electrode powder, and a second driver drives a second pressure head to apply pressure to the electrode powder through the carrier; the sliding end of the linear displacement sensor is driven by the driver to slide and approach, so that the calculation module can obtain weight data, voltage data, current data and distance data, and the resistivity, the compaction density and / or the package density are calculated by combining set parameters; the performance parameters of the electrode powder can be tested on line in the production process of the positive electrode and the negative electrode.

Description

Technical Field

[0001] The present invention relates to the technical field of electrode powder testing, in particular to an online testing device for electrode powder. Background Art

[0002] The positive and negative electrodes of the battery are generally made of powder materials such as ternary, lithium iron phosphate, graphite, silicon carbon, silicon oxide, and hard carbon. The resistivity, compaction density, and packaging density of the powder materials are key parameters for evaluating their performance. Therefore, during the production process of the positive and negative electrodes, the positive and negative electrode powder materials need to be taken out of the production line and sent to the laboratory for testing. However, the same batch of materials often has different test results due to different sampling times, different temperature and humidity in the test environment, etc. When these test results are used as reference data for production, production misjudgments are prone to occur, resulting in quality problems in the products produced. Summary of the Invention

[0003] The purpose of the present invention is to provide an online testing device for electrode powder, which can test the performance parameters of electrode powder online during the production process of positive and negative electrodes, realize real-time monitoring of the production quality of electrode powder, and provide data support for production.

[0004] In order to achieve the above object, the present invention discloses an electrode powder online testing device for testing electrode powder loaded in a sagger on a production transmission line, which comprises: A material transfer device and a testing device, wherein the testing device includes a hopper and a material loading assembly, the material loading assembly includes a transverse driver provided with a driving rod and a carrier fixedly connected to the driving rod, the carrier being provided with a receiving hole, the transverse driver being used to drive the carrier to move laterally to below the hopper, the material transfer device being used to transfer a sagger containing electrode powder to above the hopper and flip it over so that the electrode powder enters the receiving hole through the hopper, and the driving rod being provided with a weighing sensor; The testing device includes a linear displacement sensor and a resistance assembly and a pressure assembly arranged vertically opposite to each other. The transverse driver is used to drive the carrier to move laterally between the resistance assembly and the pressure assembly. The resistance assembly includes a first driver provided with a first pressure head and a test probe provided at the crimping end of the first pressure head. The pressure assembly includes a second driver provided with a second pressure head and a pressure sensor provided at the second pressure head. The first driver is used to drive the crimping end of the first pressure head to press into the receiving hole to make close contact with the electrode powder and allow the detection end of the test probe to be inserted into the electrode powder. The second driver is used to drive the second pressure head to abut against the bottom surface of the carrier so as to apply pressure to the electrode powder through the carrier. The linear displacement sensor includes two sliding ends fixedly connected to the first pressure head and the second pressure head respectively, and the two sliding ends slide close to each other under the drive of the first driver and the second driver. The testing device includes a computing module electrically connected to the weighing sensor, the test probe, and the linear displacement sensor. The computing module is used to obtain weight data of the weighing sensor, voltage data and current data of the test probe, and distance data of the linear displacement sensor, and calculate the resistivity, compaction density, and / or packaging density in combination with set parameters.

[0005] Preferably, a vibrator is provided on the outer side wall of the carrier.

[0006] Preferably, the testing device includes a gas nozzle connected to an external high-pressure gas generating device, the opening of the gas nozzle is set upward, and when the lateral driver drives the carrier to move laterally to above the gas nozzle and drives the carrier to flip, the gas nozzle outputs high-pressure gas to the carrier.

[0007] Preferably, the linear displacement sensor includes a resistance test rod extending vertically and a first sliding member and a second sliding member slidably connected to the resistance test rod, and the first sliding member and the second sliding member are fixedly connected to the first pressure head and the second pressure head respectively, so that the first sliding member and the second sliding member slide close to each other along the resistance test rod under the drive of the first driver and the second driver.

[0008] Preferably, the test probe includes at least two current probes and at least two voltage probes arranged between the current probes, the calculation module is provided with a voltage and current detection circuit, the crimping end includes a mold core, a crimping block arranged below the mold core, and a first insulating sheet wrapped and fixed on the outside of the mold core and the crimping block, the radial dimension of the crimping block is adapted to the radial dimension of the accommodating hole, a channel is provided in the mold core, and the crimping block is provided with a plurality of through holes arranged side by side at intervals, the current probe and the voltage probe are correspondingly passed through the through holes, and one end thereof passes through the through hole downward, and the other end is electrically connected to the voltage and current detection circuit through a signal line passing through the channel.

[0009] Preferably, the first insulating sheet and the crimping block are made of PTFE, PFA, PEEK or PPS.

[0010] Preferably, the distance between two adjacent through holes ranges from 0.1 cm to 0.5 cm.

[0011] Preferably, a second insulating sheet is attached to the side wall of the accommodating hole, and a spring and a slider are provided in the accommodating hole. The radial dimension of the slider is adapted to the radial dimension of the accommodating hole. The slider is provided above the spring and contacts the electrode powder entering the accommodating hole. A limit block is provided in the spring. When the second driver drives the second pressure head to push the carrier upward to compress the electrode powder, the slider slides along the accommodating hole and compresses the spring until it abuts against the limit block.

[0012] Preferably, the second insulating sheet and the slider are made of PTFE, PFA, PEEK or PPS.

[0013] Preferably, the testing device is arranged in a silo, and a dew point sensor and / or a temperature sensor is arranged in the silo.

[0014] Compared with the prior art, the present invention is provided with a material moving device and a testing device. The testing device includes a funnel and a loading assembly. The loading assembly includes a transverse driver and a carrier. The transverse driver drives the carrier to move to the bottom of the funnel. The material moving device transfers the sagger to the top of the funnel and flips it over so that the electrode powder enters the accommodating hole of the carrier. The linear displacement sensor, resistance assembly, pressure assembly and calculation module provided with the testing device are matched. The resistance assembly includes a first driver, a first pressure head and a test probe. The pressure assembly includes a second pressure head, a second driver and a pressure sensor. The first driver drives the crimping end of the first pressure head to contact the electrode. The electrode powder is in close contact and the test probe is inserted into the electrode powder. The second driver drives the second pressure head to apply pressure to the electrode powder through the carrier. The sliding end of the linear displacement sensor slides close under the drive of the driver, so that the calculation module can obtain the weight data of the weighing sensor, the voltage data and current data of the test probe, and the distance data of the linear displacement sensor, and calculate the resistivity, compaction density and / or packaging density in combination with the set parameters, so as to realize the online testing of the performance parameters of the electrode powder during the production process of the positive and negative electrodes, and then monitor the production quality of the electrode powder in real time to provide data support for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of an online testing device for electrode powder according to an embodiment of the present invention.

[0016] Figure 2 This is a front view of the testing device in the electrode powder online testing equipment according to an embodiment of the present invention when receiving materials.

[0017] Figure 3 This is a front view of the testing device in the electrode powder online testing equipment according to an embodiment of the present invention during testing.

[0018] Figure 4 Schematic diagram of the structure of the crimping end of the first indenter and the carrier in the electrode powder online testing equipment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0020] See also Figures 1 to 4 The present invention discloses an electrode powder online testing device for testing electrode powder loaded on a sagger 201 on a production transmission line, comprising: The material transfer device 101 and the testing device 102 include a hopper 1 and a loading assembly 2. The loading assembly 2 includes a transverse driver 22 provided with a driving rod 21 and a carrier 23 fixedly connected to the driving rod 21. The carrier 23 is provided with a receiving hole 231. The transverse driver 22 is used to drive the carrier 23 to move laterally to the bottom of the funnel 1. The material transfer device 101 is used to transfer the sagger 201 containing the electrode powder to the top of the funnel 1 and flip it over so that the electrode powder enters the receiving hole 231 through the funnel 1. The driving rod 21 is provided with a weighing sensor 211. The testing device 102 includes a linear displacement sensor 3 and a resistance component 4 and a pressure component 5 arranged vertically opposite to each other. The transverse driver 22 is used to drive the carrier 23 to move laterally between the resistance component 4 and the pressure component 5. The resistance component 4 includes a first driver 42 provided with a first pressing head 41 and a test probe 6 provided at the crimping end 411 of the first pressing head 41. The pressure component 5 includes a second driver 52 provided with a second pressing head 51 and a pressure sensor 53 provided at the second pressing head 51. The first driver 42 is used to drive the crimping end 411 of the first pressing head 41 to press into the accommodating hole 231 to make close contact with the electrode powder and allow the detection end of the test probe 6 to be inserted into the electrode powder. The second driver 52 is used to drive the second pressing head 51 to abut against the bottom surface of the carrier 23 to apply pressure to the electrode powder through the carrier 23. The linear displacement sensor 3 includes two sliding ends 31 fixedly connected to the first pressing head 41 and the second pressing head 51 respectively. The two sliding ends 31 slide close to each other under the drive of the first driver 42 and the second driver 52. The testing device 102 includes a computing module (not shown) electrically connected to the weighing sensor 211, the test probe 6, and the linear displacement sensor 3. The computing module is used to obtain weight data from the weighing sensor 211, voltage data and current data from the test probe 6, and distance data from the linear displacement sensor 3, and calculate the resistivity, compaction density, and / or packaging density based on the set parameters.

[0021] Compared with the prior art, the present invention is provided with a material moving device 101 and a testing device 102, the testing device 102 includes a funnel 1 and a loading assembly 2, the loading assembly 2 includes a transverse driver 22 and a carrier 23, the transverse driver 22 drives the carrier 23 to move to the bottom of the funnel 1, the material moving device 101 transfers the sagger 201 to the top of the funnel 1 and flips it over so that the electrode powder enters the receiving hole 231 of the carrier 23, and cooperates with the linear displacement sensor 3, the resistance assembly 4, the pressure assembly 5 and the calculation module provided with the testing device 102, the resistance assembly 4 includes a first driver 42, a first pressure head 41 and a test probe 6, the pressure assembly 5 includes a second pressure head 51, a second driver 52 and a pressure sensor 53, the first The driver 42 drives the crimping end 411 of the first pressing head 41 to be in close contact with the electrode powder and allows the test probe 6 to be inserted into the electrode powder. The second driver 52 drives the second pressing head 51 to apply pressure to the electrode powder through the carrier 23. The sliding end 31 of the linear displacement sensor 3 slides closer under the drive of the driver, so that the calculation module can obtain the weight data of the weighing sensor 211, the voltage data and current data of the test probe 6, and the distance data of the linear displacement sensor 3, and calculate the resistivity, compaction density and / or wrapping density in combination with the set parameters, so as to realize online testing of the performance parameters of the electrode powder during the production process of the positive and negative electrodes, and then monitor the production quality of the electrode powder in real time to provide data support for production.

[0022] Specifically, in this embodiment, the transverse driver 22 is a commercially available servo electric push rod, which is internally provided with a trapezoidal screw, a ball screw, gears and a servo motor to achieve the functions of extension and rotation. The stroke of the push rod (driving rod 21) is 1mm-300mm, but is not limited thereto.

[0023] Specifically, in this embodiment, the weighing sensor 211 is a commercially available cantilever weighing sensor, which adopts a cantilever beam structure and determines the force applied to the cantilever beam by measuring the bending deformation of the cantilever beam. The measuring range is 0kg-10kg. The mass of the electrode powder in the carrier 23 can be calculated by subtracting the mass of the carrier 23 before the electrode powder is loaded from the mass of the carrier 23 after the electrode powder is loaded.

[0024] Specifically, in this embodiment, the first driver 42 is a commercially available servo electric cylinder, which is provided with a ground ball screw, a planetary ball screw and a motor, and can achieve pushing control of the first pressing head 41 with an accuracy of 0.02mm, a thrust of 15 tons and a stroke of 0-50mm, so that the crimping end 411 of the first pressing head 41 can be combined with the carrier 23 and in close contact with the electrode powder, thereby applying different forces to the electrode powder, but not limited to this. The first driver 42 can also select a servo electric cylinder with an accuracy of 0.01mm-0.1m, a thrust of 1-35 tons and a stroke of 1-100mm.

[0025] Specifically, in this embodiment, the second driver 52 is a commercially available electronic servo press, which drives the second pressing head 51 with a stroke of 0 mm-200 mm and a pressure range of 0.1 KN-150 KN. Its built-in pressure sensor 53 can display in real time, so as to accurately apply different forces to the electrode powder.

[0026] See Figures 1 to 4 The linear displacement sensor 3 includes a resistance test rod 32 extending vertically and a first sliding member 33 and a second sliding member 34 slidably connected to the resistance test rod 32. The first sliding member 33 and the second sliding member 34 are fixedly connected to the first pressure head 41 and the second pressure head 51 respectively, so that the first sliding member 33 and the second sliding member 34 slide close to each other along the resistance test rod 32 under the drive of the first driver 42 and the second driver 52, so that the linear displacement sensor 3 can measure different resistance signals, and the thickness of the electrode powder in the carrier 23 can be obtained based on these resistance signals.

[0027] See Figures 1 to 4 A vibrator 7 is provided on the outer side wall of the carrier 23.

[0028] Specifically, in this embodiment, the vibrator 7 is a commercially available ultrasonic vibrator with a frequency of 1 MHz, but is not limited thereto.

[0029] See Figures 1 to 4 The testing device 102 includes a gas nozzle 8 connected to an external high-pressure gas generating device. The opening of the gas nozzle 8 is set upward. When the lateral driver 22 drives the carrier 23 to move horizontally to the top of the gas nozzle 8 and drives the carrier 23 to flip, the gas nozzle 8 outputs high-pressure gas to the carrier 23.

[0030] Specifically, in this embodiment, the gas blowing nozzle 8 is connected to the high-pressure nitrogen device of the production line to achieve high-pressure nitrogen output with a pressure greater than 0.6 MPa, but the present invention is not limited thereto.

[0031] See Figures 1 to 4 The test probe 6 includes at least two current probes 61 and at least two voltage probes 62 arranged between the current probes 61. The calculation module is provided with a voltage and current detection circuit. The crimping end 411 includes a mold core 412, a crimping block 413 arranged below the mold core 412, and a first insulating sheet 414 wrapped and fixed on the outside of the mold core 412 and the crimping block 413. The radial dimension of the crimping block 413 is adapted to the radial dimension of the accommodating hole 231. A channel 415 is provided in the mold core 412, and the crimping block 413 is provided with a plurality of through holes 416 arranged side by side at intervals. The current probe 61 and the voltage probe 62 are correspondingly penetrated through the through hole 416, and one end thereof passes through the through hole 416 downward, and the other end is electrically connected to the voltage and current detection circuit through a signal line 417 passing through the channel 415.

[0032] Specifically, in this embodiment, two current probes 61 and two voltage probes 62 are provided, and the two voltage probes 62 are provided between the two current probes 61 , but the present invention is not limited thereto.

[0033] Specifically, in this embodiment, the mold core 412 is made of high-strength stainless steel capable of withstanding high pressures of 0-15 MPa. Driven by the first driver 42, the mold core 412 drives the crimping block 413 to apply pressure from top to bottom to the electrode powder in the receiving hole 231, thereby keeping the electrode powder tightly contained within the receiving hole 231.

[0034] Furthermore, the material of the first insulating sheet 414 and the crimping block 413 is PTFE, PFA, PEEK or PPS. In this embodiment, the material of the first insulating sheet 414 and the crimping block 413 is preferably PTFE, which has electrical insulation and self-lubricating properties, which is beneficial to isolating the accommodating hole 231 from the outside world and avoiding the introduction of metal foreign matter.

[0035] Specifically, in this embodiment, the first insulating sheet 414 is fixedly connected to the core mold 412 and the crimping block 413 by ultrasonic welding, thereby achieving electrical insulation of the core mold 412 while connecting the two, thereby ensuring the insulation performance of the crimping end 411.

[0036] Furthermore, the interval between two adjacent through holes 416 ranges from 0.1 cm to 0.5 cm. In this embodiment, the interval is 0.2 cm, so that the interval between the two current probes 61 and the two voltage probes 62 is 0.2 cm, but the present invention is not limited thereto.

[0037] Specifically, the voltage and current detection circuit can measure the voltage between the two probes through the voltage probe 62, and the measurement range is 50mV-5V, and can measure the current between the two probes through the current probe 61, and the measurement range is 0.1uA-1000mA. In this embodiment, the voltage and current detection circuit obtains the test parameters of the electrode powder resistivity by applying a constant 0.1V voltage to the voltage probe 62 and measuring the current of the current probe 61. See Figures 1 to 4A second insulating sheet 232 is attached to the side wall of the accommodating hole 231, and a spring 233 and a slider 234 are provided in the accommodating hole 231. The radial dimension of the slider 234 is adapted to the radial dimension of the accommodating hole 231. The slider 234 is arranged above the spring 233 and contacts the electrode powder entering the accommodating hole 231. A limit block 235 is provided in the spring 233. When the second driver 52 drives the second pressing head 51 to push the carrier 23 to move upward to compress the electrode powder, the slider 234 slides along the accommodating hole 231 and compresses the spring 233 until it abuts against the limit block 235.

[0038] Specifically, in this embodiment, the material of the carrier 23 is stainless steel, and the radial dimension of the receiving hole 231 for filling the electrode powder can be selected within the range of 5mm-20mm, and the axial dimension can be within the range of 5mm-50mm. In this embodiment, the radial dimension of the receiving hole 231 is 10mm, and the axial dimension is 20mm, but not limited to this. Correspondingly, the radial dimension of the slider 234 is 10mm and the thickness is 5mm, so as to cooperate with the carrier 23 to confine the electrode powder within the space of the receiving hole 231.

[0039] Specifically, in this embodiment, the amount of electrode powder that can be received can be varied by adjusting the length of spring 233, allowing the accommodating hole 231 to accommodate different volumes of electrode powder. Furthermore, a stopper 235 is provided to support the slider 234 when the spring 233 is compressed, providing a physical stop. This prevents the spring 233 from collapsing, maintaining its elasticity, and enabling the linear displacement sensor 3 to accurately measure the thickness of the electrode powder within the carrier 23.

[0040] Furthermore, the material of the second insulating sheet 232 and the slider 234 is PTFE, PFA, PEEK or PPS. In this embodiment, the material of the second insulating sheet 232 and the slider 234 is preferably PTFE, which has electrical insulation and self-lubricating properties, and is in direct contact with the electrode powder to transmit the pressure jointly applied to the electrode powder by the first driver 42 through the crimping end 411 of the first pressing head 41 and the second driver 52 through the carrier 23.

[0041] See Figures 1 to 4 The testing device 102 is arranged in the silo 9 , and a dew point sensor 91 and / or a temperature sensor 92 is arranged in the silo 9 .

[0042] By monitoring the temperature and dew point in the silo 9, the pertinence of the test data is ensured, and when the test data is abnormal, the cause of the abnormality can be checked by tracing the data, which is conducive to preventing the test environment factors from affecting the normal production.

[0043] Specifically, in this embodiment, the monitoring range of the temperature sensor 92 is -20°C-100°C, and the dew point sensor 91 is a dew point meter probe, which cooperates with the dew point meter to achieve dew point monitoring in the range of -60°C-60°C, thereby monitoring the temperature and dew point of the silo 9 during the test.

[0044] See Figures 1 to 4 In this embodiment, the electrode powder online testing equipment of the present invention is used to test the powder resistivity, compaction density and package density of the electrode powder loaded on the sagger 201 on the production conveyor line and after high-temperature carbonization and cooling in the roller kiln. The operation process is as follows: The weight data of the weighing sensor 211 is reset to zero, and the transverse driver 22 is controlled to drive the driving rod 21 to extend laterally to push the carrier 23 on the driving rod 21 to the bottom of the funnel 1. The manipulator (material moving device 101) is controlled to transfer the sagger 201 to the top of the funnel 1 of the silo 9 and flip it 180 degrees so that the electrode powder in the sagger 201 is poured into the funnel 1 of the silo 9, and part of the material enters the receiving hole 231 of the carrier 23 through the funnel 1 to realize the reception of the electrode powder material. The gas blower 8 is started to output high-pressure nitrogen and the vibrator 7 is started to vibrate the carrier 23 for thirty seconds so that the electrode powder is completely loaded into the receiving hole 231 of the carrier 23. At this time, the weight data of the weighing sensor 211 is obtained.

[0045] Test the wrapping density of the electrode powder: control the lateral driver 22 to drive the driving rod 21 to contract laterally to move the carrier 23 on the driving rod 21 to between the first pressing head 41 and the second pressing head 51, control the first driver 42 to drive the crimping end 411 of the first pressing head 41 to be pressed into the accommodating hole 231, and synchronously start the vibrator 7 to vibrate the carrier 23 for one hundred seconds, and then control the second driver 52 to drive the second pressing head 51 upward to abut against the bottom of the carrier 23 to apply pressure to the electrode powder through the carrier 23 until the value of the pressure sensor 53 on the second pressing head 51 is 50N, and maintain it for 30 seconds. At this time, read the distance data of the linear displacement sensor 3.

[0046] At this time, the calculation module can be based on the formula ρ3= Calculate the packing density ρ3 of the electrode powder in grams per cubic centimeter (g / cm 3 ), where the powder mass m is obtained by the weighing sensor 211 in grams (g); the diameter d of the electrode powder is the radial dimension of the receiving hole 231 in centimeters (cm); the thickness H of the electrode powder is obtained by the linear displacement sensor 3 when the pressure sensor 53 displays a force of 50N in centimeters (cm). In this embodiment, the circumference of a circle is Take 3.1415; m=1.7410g; H=1.2960cm, d=1cm; therefore, the packing density of the electrode powder ρ3 = =1.71 g / cm 3 By testing the 50N package density to reflect the tap density, the stability of product quality can be effectively monitored and data support can be provided for production.

[0047] Test the compaction density of the electrode powder: Control the lateral driver 22 to drive the driving rod 21 to contract laterally to move the carrier 23 on the driving rod 21 to between the first pressing head 41 and the second pressing head 51, control the first driver 42 to drive the crimping end 411 of the first pressing head 41 to press into the receiving hole 231, and then repeat the 5-ton 5-step method by controlling the second driver 52 to drive the second pressing head 51 to continuously press upward against the bottom of the carrier 23 to apply pressure to the electrode powder through the carrier 23, and each time the second pressing head The value of the pressure sensor 53 on 51 reaches different set values ​​and maintains different set time lengths, and then the distance data of the linear displacement sensor 3 is read. For example, the different set values ​​can be 100, 5000, 20, 10000, 20, 15000, 20, 20000, 20, 50000, 20, and the corresponding different set time lengths can be 10, 30, 10, 30, 10, 30, 10, 30, 10, 30, 10.

[0048] At this time, the calculation module can be based on the formula ρ2= Calculate the compacted density ρ2 of the electrode powder in grams per cubic centimeter (g / cm 3 ), where the powder mass m is obtained by the weighing sensor 211 in grams (g); the diameter d of the electrode powder is the radial dimension of the receiving hole 231 in centimeters (cm); the thickness H of the electrode powder is obtained by the linear displacement sensor 3 after executing the 5-ton 5 step in centimeters (cm). In this embodiment, the circumference of a circle is Take 3.1415; m=1.7410g; H=1.0901cm, d=1cm; therefore, the compacted density of the electrode powder ρ2 = =2.03 g / cm 3 ; Test the resistivity of the electrode powder: control the lateral driver 22 to drive the driving rod 21 to contract laterally to move the carrier 23 on the driving rod 21 to between the first pressing head 41 and the second pressing head 51, control the first driver 42 to drive the crimping end 411 of the first pressing head 41 to be pressed into the accommodating hole 231, and then control the second driver 52 to drive the second pressing head 51 upward to abut against the bottom of the carrier 23 to apply pressure to the electrode powder through the carrier 23 until the value of the pressure sensor 53 on the second pressing head 51 is the set value and maintained for the set time, and then the voltage and current detection circuit obtains the test parameters of the resistivity of the electrode powder by applying a constant voltage to the voltage probe 62 and measuring the current of the current probe 61.

[0049] At this time, the calculation module is based on the formula ρ1=2πι Calculate the resistivity ρ1 of the electrode powder in the sample near the test probes in ohm-centimeter (Ω·cm), where the probe coefficient ι is the distance between two adjacent probes in centimeters (cm), the DC voltage value U is measured by voltage probe 62 in volts (V), and the DC current value I is measured by current probe 61 in amperes (A). In this embodiment, the setting value is 5000, the setting time is 30 seconds, ι is 0.2 cm, U is a constant voltage of 0.1 V, and I is measured to be 14.74 A. Therefore, the resistivity ρ1 of the electrode powder is 2πι. =2*3.1415*0.2* =0.0085; and combined with the data from the dew point sensor 91 and the temperature sensor 92, the following table data can be obtained:

[0050] However, it is not limited to this. When testing the compaction density of the electrode powder and executing the 5-ton 5-step method, the resistivity of the electrode powder can also be tested simultaneously. That is, in the 5-ton 5-step method, each time the value of the pressure sensor 53 on the second pressure head 51 reaches a different set value, the voltage and current detection circuit applies a constant voltage to the voltage probe 62 and obtains multiple test parameters of the electrode powder resistivity by measuring the current of the current probe 61. Then, the resistivity ρ1 of multiple electrode powders corresponding to different pressure values ​​N can be calculated.

[0051] After performing the above-mentioned tests on the package density, compaction density, and resistivity of the electrode powder, the first driver 42 is controlled to drive the first pressing head 41 to retract until its crimping end 411 is disengaged from the carrier 23. The transverse driver 22 is controlled to drive the driving rod 21 to extend laterally to push the carrier 23 on the driving rod 21 to directly above the gas nozzle 8. The transverse driver 22 is controlled to drive the driving rod 21 to rotate 180 degrees so that the accommodating hole 231 is opposite to the gas nozzle 8. After the reversal, the spring 233 and the slider 234 in the accommodating hole 231 can provide a rebound force. At the same time, the gas nozzle 8 is started to output high-pressure nitrogen for purging and cleaning, and the vibrator 7 is started to provide high-frequency vibration to the carrier 23. This lasts for 120 seconds and then stops for 30 seconds to remove the electrode powder from the carrier 23. When the reading of the weighing sensor 211 is negative or within 0.1g, it means that the electrode powder in the carrier 23 has been cleaned, and the carrier 23 is cleaned between the tests of different batches of materials to ensure that the inside of the carrier 23 remains clean before the materials are loaded. The transverse driver 22 is controlled to drive the driving rod 21 to rotate 180 degrees, and the transverse driver 22 is controlled to drive the driving rod 21 to retract laterally to move the carrier 23 on the driving rod 21 to between the first pressure head 41 and the second pressure head 51. The next test is performed after waiting for 15 minutes. This cycle is repeated at a fixed frequency to perform automatic online tests on the resistivity, compaction density, and package density of the electrode powder in the production process without human interference to obtain reliable process monitoring data and improve product quality.

[0052] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. An electrode powder online testing device for testing electrode powder loaded in a sagger on a production transmission line, characterized in that: include: A material transfer device and a testing device, wherein the testing device includes a hopper and a material loading assembly, the material loading assembly includes a transverse driver provided with a driving rod and a carrier fixedly connected to the driving rod, the carrier being provided with a receiving hole, the transverse driver being used to drive the carrier to move laterally to below the hopper, the material transfer device being used to transfer a sagger containing electrode powder to above the hopper and flip it over so that the electrode powder enters the receiving hole through the hopper, and the driving rod being provided with a weighing sensor; The testing device includes a linear displacement sensor and a resistance assembly and a pressure assembly arranged vertically opposite to each other. The transverse driver is used to drive the carrier to move laterally between the resistance assembly and the pressure assembly. The resistance assembly includes a first driver provided with a first pressure head and a test probe provided at the crimping end of the first pressure head. The pressure assembly includes a second driver provided with a second pressure head and a pressure sensor provided at the second pressure head. The first driver is used to drive the crimping end of the first pressure head to press into the receiving hole to make close contact with the electrode powder and allow the detection end of the test probe to be inserted into the electrode powder. The second driver is used to drive the second pressure head to abut against the bottom surface of the carrier so as to apply pressure to the electrode powder through the carrier. The linear displacement sensor includes two sliding ends fixedly connected to the first pressure head and the second pressure head respectively, and the two sliding ends slide close to each other under the drive of the first driver and the second driver. The testing device includes a computing module electrically connected to the weighing sensor, the test probe, and the linear displacement sensor. The computing module is used to obtain weight data of the weighing sensor, voltage data and current data of the test probe, and distance data of the linear displacement sensor, and calculate the resistivity, compaction density, and / or packaging density in combination with set parameters.

2. The electrode powder online testing equipment according to claim 1, characterized in that: A vibrator is provided on the outer side wall of the carrier.

3. The electrode powder online testing equipment according to claim 1, characterized in that: The testing device includes a gas nozzle connected to an external high-pressure gas generating device, the opening of the gas nozzle is set upward, and when the lateral driver drives the carrier to move laterally to above the gas nozzle and drives the carrier to flip, the gas nozzle outputs high-pressure gas to the carrier.

4. The electrode powder online testing equipment according to claim 1, characterized in that: The linear displacement sensor includes a resistance test rod extending vertically and a first sliding member and a second sliding member slidably connected to the resistance test rod. The first sliding member and the second sliding member are fixedly connected to the first pressure head and the second pressure head respectively, so that the first sliding member and the second sliding member slide closer along the resistance test rod under the drive of the first driver and the second driver.

5. The electrode powder online testing equipment according to claim 1, characterized in that: The test probe includes at least two current probes and at least two voltage probes arranged between the current probes. The calculation module is provided with a voltage and current detection circuit. The crimping end includes a mold core, a crimping block arranged below the mold core, and a first insulating sheet wrapped and fixed on the outside of the mold core and the crimping block. The radial dimension of the crimping block is adapted to the radial dimension of the accommodating hole. A channel is provided in the mold core. The crimping block is provided with a plurality of through holes arranged side by side at intervals. The current probe and the voltage probe are correspondingly passed through the through holes, and one end thereof passes through the through hole downward, and the other end is electrically connected to the voltage and current detection circuit through a signal line passing through the channel.

6. The electrode powder online testing equipment according to claim 5, characterized in that: The first insulating sheet and the crimping block are made of PTFE, PFA, PEEK or PPS.

7. The electrode powder online testing equipment according to claim 5, characterized in that: The distance between two adjacent through holes ranges from 0.1 cm to 0.5 cm.

8. The electrode powder online testing equipment according to claim 1, characterized in that: A second insulating sheet is attached to the side wall of the accommodating hole, and a spring and a slider are provided in the accommodating hole. The radial dimension of the slider is adapted to the radial dimension of the accommodating hole. The slider is provided above the spring and contacts the electrode powder entering the accommodating hole. A limit block is provided in the spring. When the second driver drives the second pressure head to push the carrier upward to compress the electrode powder, the slider slides along the accommodating hole and compresses the spring until it abuts against the limit block.

9. The electrode powder online testing equipment according to claim 8, characterized in that: The second insulating sheet and the slider are made of PTFE, PFA, PEEK or PPS.

10. The electrode powder online testing equipment according to claim 1, characterized in that: The testing device is arranged in a silo, and a dew point sensor and / or a temperature sensor is arranged in the silo.

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