Electrode array control method and system for power transmission and medium

Abstract

The invention provides an electrode array control method for power transmission, which comprises the following steps of: measuring the root temperature of each single electrode (2) in real time at certain time intervals to form a temperature set, counting the average value, the maximum value and the standard deviation of each temperature measurement value in the temperature set, and if the maximum value at the current moment is greater than the sum of the average value and p times of the standard deviation, judging that the maximum value is greater than the sum of the average value and the standard deviation. If yes, forced cooling is started for the single electrode (2) corresponding to the maximum value until the root temperature of the single electrode (2) at a subsequent certain moment is smaller than the sum of the average value and q times of standard deviation at the moment, and forced cooling of the single electrode (2) is ended. The electrode array control method for power transmission is scientific, reliable, simple and convenient, a corresponding control system can be realized only by simply adding equipment elements such as a temperature sensor (7) and a fan (8) on the basis of the facility of the existing graphitization furnace (1), and the existing facility and production process are basically not influenced, so that the method has very wide adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of graphitization furnace connection device, in particular to a kind of electrode array control method, system and medium for power transmission. BACKGROUND

[0002] As a device for converting carbon materials into graphite by high temperature, the graphitization furnace is widely used in the production of negative electrode materials of lithium ion batteries and sodium ion batteries. When the graphitization furnace is working, the electrodes at the furnace head and the furnace tail need to be connected to the copper-aluminum busbar outside the furnace through the clamping plate to form a loop, and high temperature is generated after power on to complete the graphitization of carbon materials in the furnace. Generally, the highest temperature in the process of graphitization conversion of carbon materials in the furnace is about 3000℃. In industry, carbon materials such as graphite are generally used as the basis to make electrodes.

[0003] In order to improve production efficiency and reduce manufacturing cost, modern graphitization furnace is developing towards large-scale, which requires arranging multiple single electrodes at the furnace head and the furnace tail to form an electrode array: first, the number of electrodes increases, which can improve the current carrying capacity; second, multiple single electrodes are dispersedly connected to different areas in the furnace, which helps to improve the uniformity of power transmission in each area of the furnace, saves production time and improves the consistency of products in each area of the furnace, and consistency is one of the most important product properties of battery negative electrode materials.

[0004] Due to the great difference between the internal areas of the graphitization furnace, the internal carbon material preparation process takes a long time and the working condition is complex and changeable, and the current known technical means cannot guarantee that the currents carried by each single electrode are always equal, which leads to that the material preparation process in each area of the furnace cannot be well synchronized, which has adverse effects on working efficiency and material consistency. Therefore, it is urgent to develop new technical means to improve the uniformity of power transmission of electrode array. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a scientific and reliable, simple and convenient, widely applicable, and helpful to improve the uniformity of current distribution electrode array control method for power transmission, and provides the corresponding control system and medium.

[0006] According to the first aspect of the present application, a kind of electrode array control method for power transmission is provided, the electrode array is made of several parallel carbon-based material single electrodes, and is used to power supply for graphitization furnace, characterized in that, the method comprises: measuring the root temperature of each single electrode in real time at preset time interval to form temperature set, and the average value, maximum value and standard deviation of temperature value in temperature set are counted;

[0007] If the maximum value at the current time is greater than the sum of the average value and p times the standard deviation, then the forced cooling is started for the single electrode corresponding to the maximum value; until at a certain time later, the root temperature of the single electrode is less than the sum of the average value and q times the standard deviation of the temperature value at the time, the forced cooling of the single electrode is ended.

[0008] wherein p and q are coefficients;

[0009] The measurement position of the root temperature of the single electrode is located at the contact between the single electrode and the furnace shell and outside the furnace.

[0010] Optionally, in the electrode array control method for power transmission, the time interval of the temperature measurement is between 10 seconds and 10 minutes.

[0011] Optionally, in the electrode array control method for power transmission, the coefficient p is between 1 and 4, and the coefficient q is between 0.5 and 3 and p>q.

[0012] Optionally, in the electrode array control method for power transmission, the single electrode is made of a graphite-based material.

[0013] Optionally, in the electrode array control method for power transmission, the forced cooling is in the form of air cooling.

[0014] Optionally, in the electrode array control method for power transmission, the action site of the forced cooling is located on the single electrode, and the distance from the contact between the single electrode and the furnace shell is between 1 / 3 and 2 / 3 of the total length of the single electrode exposed outside the furnace.

[0015] Optionally, in the electrode array control method for power transmission, the root temperature of the single electrode is measured by a temperature sensor embedded in the single electrode.

[0016] Optionally, in the electrode array control method for power transmission, the temperature sensor is a thermocouple with an insulating sheath.

[0017] Further, the forced cooling of the single electrode is realized by using a fan to blow air to the single electrode.

[0018] Optionally, a fan is arranged near each single electrode for blowing air to the single electrode.

[0019] Further, a wind shield is arranged for the fan, or a wind shield is arranged at the air blowing position of the single electrode, so as to improve the cooling efficiency and reduce the forced cooling effect on the surrounding electrodes during the air blowing process of the single electrode.

[0020] According to a second aspect of the present application, a control system applied to the electrode array control method for power transmission is provided, which comprises a measurement module, a storage module, an operation module and an execution module.

[0021] The measuring module is a temperature sensor for measuring the root temperature of each single electrode.

[0022] The storage module is used for storing the data measured by the measuring module.

[0023] The operation module is used for reading the measurement data, performing statistical analysis and issuing control instructions to the execution module.

[0024] The execution module is a fan for implementing forced cooling on the specified single electrode.

[0025] According to a third aspect of the present application, a computer readable storage medium is provided, in which a plurality of program codes are stored, the program codes being adapted to be loaded and run by a processor to execute the above-mentioned electrode array control method for power transmission.

[0026] The beneficial effects of the present application will be described below in combination with the principles of the technical solutions.

[0027] The graphitization furnace is filled with production raw materials and resistance materials, which are inorganic materials like the electrode materials and have the characteristic of decreasing resistivity with increasing temperature within the working temperature range. Although the electrode array for power transmission of the graphitization furnace is observed from the outside to be composed of single electrodes of the same specification connected in parallel, the power transmission currents shared by the single electrodes are theoretically consistent. However, due to the differences in heat dissipation capacity, spatial position, compaction degree of the loaded materials and insulation effect of the furnace bottom in different internal regions, the temperature and resistivity in different internal regions are different, which leads to the inconsistency of the internal current density distribution: the regions with higher current density often have higher temperature; the local higher temperature helps to accelerate the graphitization process of the raw materials, and the resistivity of the raw materials decreases with the increase of the graphitization degree, which is more conducive to the increase of the current density in the local high-temperature region, thus continuously strengthening in a positive direction. The uneven distribution of the current density in the furnace worsens the consistency index of the product and reduces the production capacity utilization rate of the graphitization furnace, prolonging the production cycle.

[0028] If a local high temperature occurs in the region where a single electrode extends into the furnace, the single electrode will be allocated more power transmission current. Due to the excellent thermal conductivity of graphite-based materials, under the double effects of heat conduction and the greater ohmic heat of the single electrode itself, the temperature of the single electrode is higher than that of other single electrodes.

[0029] The resistivity of graphite materials at room temperature is on the order of 10 -6 Ω·m, and decreases continuously with increasing temperature. When the temperature rises to 1000℃, the resistivity can be reduced to a very low level. According to this characteristic, if the temperature of a single electrode in the electrode array is significantly higher than that of other single electrodes in the array, the single electrode is individually subjected to forced cooling to reduce its temperature and increase its resistivity, thereby reducing the amount of current transmission allocated to it until the temperature of the single electrode is reduced to a reasonable level.

[0030] Specifically, statistical methods are used to determine whether there are single electrodes with significantly higher temperatures within the electrode array.

[0031] To minimize external interference, the temperature measurement point at the root of each individual electrode is located at the contact point between the electrode and the furnace shell, outside the furnace. The temperature values ​​are typically between room temperature and 1000°C, falling within the measurement range of conventional industrial thermocouples. The thermocouple has an insulating sheath and is placed inside the electrode for measurement, thus ensuring accurate and reliable temperature readings.

[0032] Forced cooling involves air cooling at the center of a single electrode, which is convenient to operate and causes less interference to surrounding components. Compared with other forced cooling methods such as water cooling, air cooling is simple to implement on-site and eliminates the risk of leaks.

[0033] Therefore, the electrode array control method for power transmission provided by this invention, combined with the specific working characteristics of the graphitization furnace production process, effectively utilizes the characteristic that the resistivity of graphite-based materials increases with decreasing temperature within the working temperature range to reduce the temperature of specific single electrodes through localized forced air cooling. Superficially, this technique only reduces the temperature of a single electrode, but in reality, it simultaneously increases the resistance of that specific single electrode and reduces its current distribution, thus achieving the unexpected effect of promoting the uniformity of power transmission in the electrode array, improving product consistency, and increasing production efficiency. This provides a completely new technical solution to the aforementioned technical problems that have long plagued the graphitization furnace field. Overall, the entire control method is scientific, reliable, simple, and convenient. The corresponding control system only requires the simple addition of temperature sensors and fans to the existing graphitization furnace facilities, with minimal impact on existing facilities and production processes, thus possessing very wide adaptability. Attached Figure Description

[0034] Figure 1 This is a flowchart of the power transmission electrode array control method in an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the graphitization furnace and its power transmission electrode array in an embodiment of the present invention. In the figure, 1 is the graphitization furnace, 2 is a single electrode, 3 is a clamping plate, 4 is a wire, 5 is a busbar, 6 is a power supply, 7 is a temperature sensor, and 8 is a fan.

[0036] Figure 3 This is a schematic diagram of the configuration of the power transmission electrode array control system in an embodiment of the present invention. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1 andFigure 2 As shown, a method for controlling an electrode array for power transmission is disclosed. The electrode array consists of several parallel single electrodes 2 made of carbon-based material, used to transmit power to a graphitization furnace 1. The method involves measuring the root temperature of each single electrode 2 in real time at certain preset time intervals to form a temperature set, and statistically analyzing the average, maximum, and standard deviation of each temperature measurement value in the temperature set.

[0039] If the maximum value at the current moment is greater than the sum of the average value and p times the standard deviation, then forced cooling is initiated for the single electrode 2 corresponding to the maximum value; until the root temperature of the single electrode 2 at a later moment is less than the sum of the average value of all temperature measurements at that moment and q times the standard deviation, then forced cooling for the single electrode 2 ends.

[0040] Both p and q above are coefficients;

[0041] The temperature measurement position at the root of the single electrode 2 is located at the contact point between the single electrode 2 and the furnace shell, and is outside the furnace.

[0042] Preferably, in the above-described control method for the electrode array used in power transmission, the time interval for temperature measurement is between 10 seconds and 10 minutes.

[0043] Preferably, in the above-described control method for the electrode array used in power transmission, the coefficient p is between 1 and 4, the coefficient q is between 0.5 and 3, and p > q.

[0044] Preferably, in the above-described method for controlling an electrode array for power transmission, the single electrode 2 is made of a graphite-based material.

[0045] Preferably, in the above-mentioned control method for the electrode array used in power transmission, the forced cooling is a wind-cooling method.

[0046] Preferably, in the above-mentioned control method for the electrode array for power transmission, the forced cooling part on the single electrode 2 is located between 1 / 3 and 2 / 3 of the total length of the single electrode 2 exposed outside the furnace shell at the point where the single electrode 2 contacts the furnace shell.

[0047] Preferably, in the above-mentioned control method for the power transmission electrode array, the measurement of the root temperature of the single electrode 2 is performed by a temperature sensor 7 embedded inside the single electrode 2.

[0048] Preferably, in the above-mentioned control method for the electrode array used in power transmission, the temperature sensor 7 is a thermocouple with an insulating sheath.

[0049] Furthermore, a fan 8 is used to blow air onto a specific single electrode 2 to achieve forced cooling.

[0050] Preferably, a fan 8 is provided near each single electrode 2 to blow air onto it.

[0051] Furthermore, a wind deflector is provided for the fan 8, or a wind deflector is provided at the blowing part of the single electrode 2, in order to reduce the forced cooling effect on the surrounding electrodes caused by the blowing process of a specific electrode.

[0052] like Figure 3 As shown, a control system applied to the above-mentioned control method for power transmission electrode arrays includes a measurement module, a storage module, a calculation module, and an execution module:

[0053] The measurement module is a temperature sensor 7, which is used to measure the root temperature of each single electrode 2;

[0054] The storage module is used to store the measurement data from the measurement module;

[0055] The arithmetic module reads data from the measurement module, performs statistical analysis, and sends control commands to the execution module;

[0056] The execution module is fan 8, which is used to provide forced cooling for a specific single electrode 2.

[0057] A computer-readable storage medium storing a plurality of program codes adapted to be loaded and run by a processor to perform the above-described control method for a power transmission electrode array.

[0058] Figure 2 In the diagram, an array of four single electrodes 2 is set at both the furnace head and the furnace tail. Only the components near the furnace head are labeled, while the components near the furnace tail are the same as those at the furnace head. Each single electrode 2 is held by a clamping plate 3 and draws power from the busbar 5 through a wire 4. A corresponding fan 8 is set below each single electrode 2.

[0059] Example

[0060] Please refer to Figures 1 to 3 Understand this embodiment.

[0061] A graphitization furnace 1 has an array of four single electrodes 2 each at the furnace head and furnace tail. The control method for the furnace head electrode array is described below, with the control of the furnace tail electrode array following the same procedure. The four single electrodes 2 at the furnace head are numbered 1# to 4#. In this embodiment, the forced cooling area on the single electrode 2 is located in the middle of the area exposed to the outside of the furnace, with coefficients p=1.2 and q=1.1. Every 5 minutes, the root temperature of each single electrode 2 is measured in real time to form a temperature set. The average, maximum, and standard deviation of each temperature measurement in the temperature set are statistically analyzed. Based on the statistical results, a judgment is made and control actions are implemented.

[0062] At a certain moment, the root temperatures of the four single electrodes 2 (1# to 4#) are 752℃, 743℃, 761℃, and 822℃, respectively. Let this moment be the current moment. Then, the average value of each temperature measurement in the temperature set at the current moment is 769.5℃, the maximum value is 822℃, and the standard deviation is 35.8℃. The maximum value corresponds to single electrode 2 (4#). Therefore, the sum of the average value and p times the standard deviation is 769.5 + 1.2 * 35.8 = 812.5℃ < 822℃. At this time, the fan 8 corresponding to single electrode 2 (4#) is immediately started to force air cooling.

[0063] After a period of time, the root temperatures of the four single electrodes 2 (1# to 4#) were 759℃, 765℃, 772℃, and 774℃, respectively. At this moment, the average value of each temperature measurement in the temperature set was 767.5℃, the maximum value was 774℃, and the standard deviation was 6.9℃. Therefore, the sum of the average value and q times the standard deviation was 767.5 + 1.1 * 6.9 = 775.1℃ > 774℃. At this point, the operation of the fan 8 corresponding to single electrode 2 (4#) was stopped, and the forced cooling of single electrode 2 (4#) was ended.

[0064] The electrode array control method for power transmission in this embodiment of the invention, combined with the specific working characteristics of the graphitization furnace 1 production process, effectively utilizes the characteristic that the resistivity of graphite-based material increases with decreasing temperature within the working temperature range, and employs localized forced air cooling to reduce the temperature of a specific single electrode 2. Superficially, this technique only reduces the temperature of the single electrode 2, but in reality, it simultaneously increases the resistance of the specific single electrode 2 and reduces its current distribution, thus achieving the unexpected effect of promoting the uniformity of power transmission in the electrode array, improving product consistency, and increasing production efficiency. This provides a completely new technical solution to the aforementioned technical problems that have long plagued the graphitization furnace 1 field. Overall, the entire control method is scientific, reliable, simple, and convenient. The corresponding control system only requires the simple addition of temperature sensors 7 and fans 8 to the existing graphitization furnace 1 facilities, with minimal impact on existing facilities and production processes, thus possessing very wide adaptability.

Claims

1. A method for controlling an electrode array for power transmission, wherein the electrode array is composed of several parallel carbon-based single electrodes (2) for supplying power to a graphitization furnace (1), characterized in that, The method includes: measuring the root temperature of each single electrode (2) in real time at a preset time interval to form a temperature set, and calculating the average value, maximum value and standard deviation of the temperature values ​​in the temperature set; If the maximum value at the current moment is greater than the sum of the average value and p times the standard deviation, then forced cooling is started for the single electrode (2) corresponding to the maximum value; until at a later moment, when the root temperature of the single electrode (2) is less than the sum of the average value of the temperature at that moment and q times the standard deviation, the forced cooling ends. Where p and q are both preset coefficients; The temperature measurement position of the root of the single electrode (2) is located at the contact point between the single electrode (2) and the furnace shell, and is located outside the furnace.

2. The control method for power transmission electrode arrays as described in claim 1, characterized in that, The time interval for temperature measurements is from 10 seconds to 10 minutes.

3. The control method for power transmission electrode arrays as described in claim 1, characterized in that, The coefficient p ranges from 1 to 4, and the coefficient q ranges from 0.5 to 3, with p > q.

4. The control method for power transmission electrode array as described in claim 1, characterized in that, The single electrode (2) is made of graphite-based material.

5. The control method for an electrode array for power transmission as described in claim 1, characterized in that, The forced cooling adopts air cooling.

6. The control method for an electrode array for power transmission as described in claim 1, characterized in that, The forced cooling action is located on the single electrode (2), and the distance between the single electrode (2) and the furnace shell is between 1 / 3 and 2 / 3 of the total length of the single electrode (2) exposed outside the furnace.

7. The method for controlling an electrode array for power transmission as described in claim 1, characterized in that, The root temperature of the single electrode (2) is measured by a temperature sensor (7) embedded inside the single electrode (2).

8. The method for controlling an electrode array for power transmission as described in claim 7, characterized in that, The temperature sensor (7) is a thermocouple with an insulating sheath.

9. A control system applied to the control method for the transmission electrode array according to any one of claims 1 to 8, characterized in that, include: Measurement module, storage module, calculation module, and execution module; The measurement module is a temperature sensor (7) used to measure the root temperature of each single electrode (2); The storage module is used to store the data measured by the measurement module; The computing module is used to read measurement data, perform statistical analysis, and send control commands to the execution module. The execution module is a fan (8) used to force-cool a designated single electrode (2).

10. A computer-readable storage medium storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the power transmission electrode array control method according to any one of claims 1 to 8.

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