Method and device for detecting uniformity of pole piece coating, electronic equipment and storage medium

Abstract

The application is suitable for the technical field of nickel-hydrogen battery manufacturing, and provides a detection method and device for coating uniformity of an electrode sheet, an electronic device and a storage medium, which comprises: before the electrode sheet is rolled, whether the coating uniformity of two sides of the electrode sheet is qualified is judged according to the total thickness δ of a target area of the electrode sheet and the single-side thickness δ1 of the target area after removing a single-side coating layer. Since the thickness of the electrode sheet after rolling is affected by the rolling pressure, the rebound of the electrode sheet and other factors in addition to the sizing amount, and the thickness of the electrode sheet before rolling is only affected by the sizing amount, the thickness of the electrode sheet can more objectively reflect the thickness of the electrode sheet. Therefore, the coating uniformity of two sides of the electrode sheet is detected according to the thickness of the electrode sheet before the electrode sheet is rolled, which is more accurate, so that the probability of the existence of positive and negative sides of the electrode sheet product can be reduced, and the problem of battery leakage caused by the existence of positive and negative sides of the electrode sheet can be solved.

Description

Technical Field

[0001] This application belongs to the field of nickel-metal hydride battery manufacturing, and particularly relates to a method, apparatus, electronic device and storage medium for detecting the uniformity of electrode coating. Background Technology

[0002] Currently, the manufacturing of nickel-metal hydride battery electrodes typically includes two processes: dry and wet. The wet process involves uniformly coating a slurry, which is made by mixing and stirring active materials (hydrogen storage alloy), conductive agents, dispersants, binders, and deionized water, onto the current collector (perforated nickel-plated steel strip) of the electrode using a paste-coating method with a scraper. The electrode is then dried, rolled, and cut to produce the finished electrode.

[0003] The coating effect of the electrode has a significant impact on the assembly, capacity, internal resistance, cycle life, and safety of nickel-metal hydride batteries, so it is necessary to ensure the uniformity of the electrode coating.

[0004] Nickel-metal hydride (NiMH) batteries have electrodes coated on both sides simultaneously. When one side of the current collector has more coating and the other side has less, it is commonly referred to as the "positive" or "negative" side. The side with more coating is the positive side, and the side with less coating is the negative side.

[0005] For nickel-metal hydride (NiMH) batteries using a stacked electrode process, using electrodes with distinct positive and negative sides can affect the consistency of battery performance. For NiMH batteries using a wound electrode process, when the positive side of the electrode is placed on the inner side of the winding (the side facing the center of the cylindrical battery is the inner side of the winding, and the side facing away from the center of the cylindrical battery is the outer side of the winding), uneven stress and the greatest deformation curvature at the starting point can cause the electrode to break at the starting point. Once the electrode breaks, it is difficult to detect during the winding process until the battery is activated and charged / discharged. Because the negative electrode breaks, its capacity decreases, the capacity ratio of the negative electrode to the positive electrode decreases, the battery's overcharge resistance deteriorates, and ultimately, battery leakage occurs. Summary of the Invention

[0006] This application provides a method, apparatus, electronic device, and storage medium for detecting the uniformity of electrode coating, which can solve the problem of battery leakage caused by the presence of positive and negative sides on the electrode.

[0007] In a first aspect, embodiments of this application provide a method for detecting the uniformity of electrode coating, applied in a coating detection device of an electrode coating detection system, the method comprising:

[0008] Before rolling the electrode sheet, the total thickness δ of the target area of ​​the electrode sheet is obtained;

[0009] Obtain the single-sided thickness δ1 of the target area after removing the single-sided coating layer;

[0010] The coating uniformity of the two sides of the electrode is determined based on the total thickness δ and the single-sided thickness δ1.

[0011] Optionally, the system further includes a measuring device, which includes a first measuring probe and a second measuring probe. The first measuring probe and the second measuring probe communicate with the coating detection device. Obtaining the total thickness δ of the target area of ​​the electrode includes:

[0012] Receive the total thickness δ measured by the first measuring probe;

[0013] Correspondingly, obtaining the single-sided thickness δ1 of the target area after removing the single-sided coating layer includes:

[0014] The single-sided thickness δ1 obtained by the second measuring probe is received.

[0015] Optionally, the total thickness δ of the target region of the electrode is the first thickness measured by the first measuring probe at the target measuring point in the target region, where the target measuring point is one of the n measuring points in the target region, and n is greater than or equal to 1;

[0016] The single-sided thickness δ1 of the target area is the second thickness measured by the second measuring probe at the target measuring point of the target area after the single-sided coating layer has been removed;

[0017] Determining whether the coating uniformity of the two sides of the electrode is qualified based on the total thickness δ and the single-sided thickness δ1 includes:

[0018] The coating uniformity of the two sides of the electrode is determined based on the first thickness measured sequentially at the n measurement points and the second thickness measured sequentially at the n measurement points.

[0019] Secondly, embodiments of this application provide a method for measuring electrode thickness, applied in the mechanical device of a measuring equipment in an electrode coating detection system. The measuring equipment further includes a sensor, a first measuring probe, a second measuring probe, and a coating removal device. The method includes:

[0020] Acquire the sensing data from the sensor;

[0021] If the target area of ​​the electrode is determined to have moved to the first measuring probe based on the sensing data, the tape is controlled to stop moving forward, and the first measuring probe is driven to measure the thickness of the target area to obtain the total thickness δ of the target area.

[0022] Control the conveyor belt to resume forward movement. If the sensing data determines that the conveyor belt in the target area has moved to the decoating device, then control the conveyor belt to stop moving forward and drive the decoating device to remove the single-sided coating of the target area.

[0023] If the conveyor belt is controlled to resume forward movement, and it is determined from the sensing data that the conveyor belt of the target area after the removal of the single-sided coating has moved to the second measuring probe, then the conveyor belt is controlled to stop moving forward, and the second measuring probe is driven to measure the thickness of the target area after the removal of the single-sided coating to obtain the single-sided thickness δ1 of the target area.

[0024] Optionally, driving the first measuring probe to measure the thickness of the target region to obtain the total thickness δ of the target region includes:

[0025] The first measuring probe is driven to reach each measuring point in the target area in sequence, so that the first measuring probe can measure the thickness at each measuring point in sequence to obtain the total thickness of each measuring point.

[0026] Correspondingly, the step of driving the second measuring probe to measure the thickness of the target region to obtain the single-sided thickness δ1 of the target region includes:

[0027] The second measuring probe is driven to reach each measuring point in sequence, so that the second measuring probe can measure the thickness at each measuring point in sequence to obtain the single-sided thickness of each measuring point.

[0028] Optionally, the measuring device further includes a powder suction device, and after driving the coating removal device to remove the single-sided coating layer of the target area, it further includes:

[0029] The powder suction device is driven to clean the surface particles and loose powder in the target area.

[0030] Thirdly, embodiments of this application provide a device for detecting the uniformity of electrode coating, which is built into the coating detection equipment of an electrode coating detection system, including:

[0031] The first acquisition module is used to acquire the total thickness δ of the target area of ​​the electrode sheet before rolling the electrode sheet.

[0032] The second acquisition module is used to acquire the single-sided thickness δ1 of the target area after removing the single-sided coating layer;

[0033] The judgment module is used to determine whether the coating uniformity of the two sides of the electrode is qualified based on the total thickness δ and the single-sided thickness δ1.

[0034] Optionally, the system further includes a measuring device, which includes a first measuring probe and a second measuring probe. The first measuring probe and the second measuring probe communicate with the coating detection device. The first acquisition module includes:

[0035] The first receiving unit is used to receive the total thickness δ measured by the first measuring probe;

[0036] Correspondingly, the second acquisition module includes:

[0037] The second receiving unit is used to receive the single-sided thickness δ1 measured by the second measuring probe.

[0038] Optionally, the total thickness δ of the target region of the electrode is the first thickness measured by the first measuring probe at the target measuring point in the target region, where the target measuring point is one of the n measuring points in the target region, and n is greater than or equal to 1;

[0039] The single-sided thickness δ1 of the target area is the second thickness measured by the second measuring probe at the target measuring point of the target area after the single-sided coating layer has been removed;

[0040] The judgment module includes:

[0041] The judgment unit is used to determine whether the coating uniformity of the two sides of the electrode sheet is qualified based on the first thickness measured sequentially at the n measurement points and the second thickness measured sequentially at the n measurement points.

[0042] Fourthly, a measuring device is provided, comprising: a sensor, a mechanical device, a first measuring probe, a second measuring probe, and a coating removal device;

[0043] The sensor is used to sense the movement position of the conveyor belt in the target area of ​​the electrode sheet;

[0044] The first measuring probe is used to measure the thickness of the target area to obtain the total thickness δ of the target area;

[0045] The coating removal device is used to remove the single-sided coating layer of the target area;

[0046] The second measuring probe is used to measure the thickness of the target area after the single-sided coating layer is removed, so as to obtain the single-sided thickness δ1 of the target area;

[0047] The mechanical device is configured to: if, based on the sensor data, the conveyor belt of the target area of ​​the electrode is determined to have moved to the first measuring probe, control the conveyor belt to stop moving forward and drive the first measuring probe to measure the thickness of the target area; control the conveyor belt to resume moving forward; if, based on the sensor data, the conveyor belt of the target area is determined to have moved to the decoating device, control the conveyor belt to stop moving forward and drive the decoating device to remove the single-sided coating of the target area; control the conveyor belt to resume moving forward; if, based on the sensor data, the conveyor belt of the target area after the single-sided coating has been removed is determined to have moved to the second measuring probe, control the conveyor belt to stop moving forward and drive the second measuring probe to measure the thickness of the target area after the single-sided coating has been removed.

[0048] Fifthly, embodiments of this application provide an electronic device, including:

[0049] The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, performs the steps of detecting the uniformity of electrode coating as described in the first aspect above.

[0050] In a sixth aspect, embodiments of this application provide a computer-readable storage medium, comprising: the computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, it implements the step of detecting the uniformity of electrode coating described in the first aspect.

[0051] In a seventh aspect, embodiments of this application provide a computer program product that, when run on an electronic device, causes the electronic device to perform the steps of the electrode coating uniformity detection method described in the first aspect.

[0052] The beneficial effects of this application embodiment compared to the prior art are as follows: Before rolling the electrode sheet, the coating uniformity of both sides of the electrode sheet is judged based on the total thickness δ of the target area of ​​the electrode sheet and the single-sided thickness δ1 of the target area after removing the single-sided coating layer. Since the thickness of the electrode sheet after rolling is affected not only by the amount of sizing agent but also by rolling pressure and electrode sheet rebound, while the thickness of the electrode sheet before rolling is only affected by the amount of sizing agent, it more objectively reflects the thickness of the electrode sheet. Therefore, detecting the coating uniformity of both sides of the electrode sheet based on the electrode sheet thickness before rolling is more accurate, thereby reducing the probability of uneven coating on the finished electrode sheet and thus solving the problem of battery leakage caused by uneven coating on the electrode sheet. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic flowchart of the electrode coating uniformity detection method provided in the embodiments of this application;

[0055] Figure 2 This is a flowchart illustrating the electrode thickness measurement method provided in an embodiment of this application;

[0056] Figure 3 This is a schematic diagram of the structure of the electrode coating uniformity detection device provided in the embodiments of this application;

[0057] Figure 4 This is a schematic diagram of the structure of the measuring device provided in the embodiments of this application;

[0058] Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0059] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0060] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0061] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0062] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0063] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0064] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0065] The uniformity of electrode coating is typically measured by coating thickness, weight, or areal density, and includes uniformity in three directions: transverse (coating width direction), longitudinal (coating length direction), and axial (coating thickness direction). In this embodiment, the uniformity of electrode coating is determined based on coating thickness.

[0066] Figure 1 A schematic flowchart of the electrode coating uniformity detection method provided in this application embodiment is shown, as follows: Figure 1 As shown, the method includes steps S110 to S130 and can be applied to the coating inspection equipment of the electrode coating inspection system. The specific implementation principle of each step is as follows:

[0067] S110, before rolling the electrode sheet, obtain the total thickness δ of the target area of ​​the electrode sheet.

[0068] In this embodiment of the application, a specific area of ​​the electrode can be selected as the target area according to the requirements. For example, after dividing the electrode into three areas A, B and C, area A can be selected as the target area, and the total thickness δ of area A can be obtained by the coating detection device. Of course, area B can also be selected as the target area, which is not limited here.

[0069] The electrode can be either a positive or negative electrode; this is not limited here. The total thickness δ of region A can be the thickness measured at any point within region A.

[0070] In this embodiment of the application, the target area is described using area A as an example.

[0071] In some embodiments, considering that the thickness of the electrode sheet before rolling after drying can more accurately evaluate the amount of sizing, the above-mentioned S110 specifically includes: after coating and drying the electrode sheet but before rolling, obtaining the total thickness δ of the target area of ​​the electrode sheet.

[0072] S120, obtain the single-sided thickness δ1 of the target area after removing the single-sided coating.

[0073] In some embodiments, assuming the target area is area A, the coating layer on one side of area A is removed to expose the current collector, and area A after removing the coating layer on one side can be obtained by a coating detection device.

[0074] The thickness of region A after removing the single-sided coating is the sum of the single-sided coating thickness and the current collector thickness.

[0075] In some embodiments, step S120 includes: obtaining the single-sided thickness of the target area after removing the single-sided coating layer, surface particles, and loose powder. Since surface particles and loose powder exist on the surface of the electrode, and these particles and loose powder can affect the measurement accuracy of the single-sided thickness, in order to reduce measurement errors, the single-sided thickness of area A can be measured after removing the single-sided coating layer of the electrode and cleaning the surface particles and loose powder of the electrode.

[0076] S130, determine whether the coating uniformity of the two sides of the electrode sheet is qualified based on the total thickness δ and the single-sided thickness δ1.

[0077] In some embodiments, the total thickness δ, the current collector (perforated nickel-plated steel strip) thickness δ0, and the single-sided thicknesses δ1 and δ2 satisfy the following formula:

[0078] δ=δ1+δ2-δ0

[0079] Among them, δ1 and δ2 are the single-sided thicknesses obtained by measuring the front and back sides of the target area of ​​the electrode twice.

[0080] Ideally, the coating inspection equipment should obtain the same single-sided thickness in two separate measurements, that is:

[0081] δ1=δ2=(δ-δ0) / 2

[0082] However, in reality, deviations often occur. Assuming the allowable deviation Δδ in the thickness of a single side of the electrode, that is, satisfying:

[0083] δ1=δ2±Δδ / 2

[0084] The deviation Δδ is determined by experiments. Within this deviation range, the negative electrode will not break during winding, and the electrical performance of the battery will meet the design requirements.

[0085] Therefore, if the total thickness δ and the single-sided thickness δ1 of the electrode meet the following judgment condition 1, the coating inspection equipment can determine that the coating uniformity of both sides of the electrode is qualified:

[0086] Judgment condition 1: (δ-δ0) / 2-Δδ / 2≤δ1≤(δ-δ0) / 2+Δδ / 2

[0087] Where Δδ is the preset allowable error for the thickness of a single side of the electrode, and δ0 is the thickness of the current collector.

[0088] It should be understood that in steps S110 to S130 above, before rolling the electrode sheet, the coating uniformity of both sides of the electrode sheet is judged based on the total thickness δ of the target area of ​​the electrode sheet and the single-sided thickness δ1 of the target area after removing the single-sided coating layer. Since the thickness of the electrode sheet after rolling is affected not only by the amount of sizing agent but also by rolling pressure and electrode sheet rebound, while the thickness of the electrode sheet before rolling is only affected by the amount of sizing agent, it more objectively reflects the thickness of the electrode sheet. Therefore, detecting the coating uniformity of both sides of the electrode sheet based on the electrode sheet thickness before rolling is more accurate, thereby reducing the probability of uneven coating on the finished electrode sheet and thus solving the problem of battery leakage caused by uneven coating on the electrode sheet.

[0089] In some embodiments, the coating inspection system further includes an electrode thickness measuring device, which includes a first measuring probe and a second measuring probe. The first and second measuring probes communicate with the coating inspection device. Figure 1 Based on the embodiment of the electrode coating uniformity detection method shown, step S110, obtaining the total thickness δ of the target area of ​​the electrode, can be achieved through the following steps:

[0090] Step 1: Receive the total thickness δ obtained by the first measuring probe.

[0091] Correspondingly, step S120, obtaining the single-sided thickness δ1 of the target area after removing the single-sided coating, can be achieved through the following steps:

[0092] Step 2: Receive the single-sided thickness δ1 obtained by the second measuring probe.

[0093] In some embodiments, the first measuring probe and the second measuring probe are equipped with a serial communication interface, through which the measured total thickness δ and single-sided thickness δ1 can be output to the coating detection device. The coating detection device receives the total thickness δ and single-sided thickness δ1 output by the first measuring probe and the second measuring probe through the serial communication interface, and can determine whether the uniformity of the electrode coating is qualified according to the determination condition 1 in step S130.

[0094] It should be understood that, through steps 11 and 12 above, the coating detection equipment can receive the total thickness δ and single-sided thickness δ1 output by the first measuring probe and the second measuring probe, respectively.

[0095] In some embodiments, in the above Figure 1 Based on the embodiment for detecting the uniformity of electrode coating shown, the total thickness δ of the target area of ​​the electrode is the first thickness measured by the first measuring probe at the target measuring point of the target area, where the target measuring point is one of n measuring points in the target area, and n is greater than or equal to 1; the single-sided thickness δ1 of the target area is the second thickness measured by the second measuring probe at the target measuring point of the target area after the single-sided coating layer has been removed. Correspondingly, step S130, which determines whether the coating uniformity of the two sides of the electrode is qualified based on the total thickness δ and the single-sided thickness δ1, can be achieved through the following steps:

[0096] Step 11: Determine whether the coating uniformity of the two sides of the electrode sheet is qualified based on the first thickness measured sequentially at the above n measurement points and the second thickness measured sequentially at the above n measurement points.

[0097] Specifically, measurement points a, b, and c are three measurement points in the target area.

[0098] The coating inspection equipment can obtain the total thickness δ(a), δ(b), and δ(c) measured at measurement points a, b, and c, and can also obtain the single-sided thickness δ1(a), δ1(b), and δ1(c) measured at measurement points a, b, and c. Then, it is determined whether the total thickness and single-sided thickness at the three measurement points meet the following three conditions. If the following three conditions are met simultaneously, the coating uniformity of the electrode is deemed to be qualified.

[0099] (δ(a)-δ0) / 2-Δδ / 2≤δ1(a)≤(δ(a)-δ0) / 2+Δδ / 2

[0100] (δ(b)-δ0) / 2-Δδ / 2≤δ1(b)≤(δ(b)-δ0) / 2+Δδ / 2

[0101] (δ(c)-δ0) / 2-Δδ / 2≤δ1(c)≤(δ(c)-δ0) / 2+Δδ / 2

[0102] It should be understood that coating inspection equipment judges the uniformity of coating based on the total thickness obtained from measurements at multiple measurement points and the single-sided thickness obtained from measurements at the same multiple measurement points, making the judgment more accurate.

[0103] Figure 2 A flowchart illustrating the electrode thickness measurement method provided in an embodiment of this application is shown, as follows: Figure 2 As shown, the method includes steps S210 to S240 and can be applied to the mechanical device of the measuring equipment in the electrode coating detection system. The measuring equipment also includes a sensor, a first measuring probe, a second measuring probe, and a coating removal device. The specific implementation principle of each step is as follows:

[0104] Step S210: Obtain the sensing data of the above-mentioned sensor.

[0105] In some embodiments, the mechanical device is connected to a sensor, which can send sensing data to the mechanical device.

[0106] The sensor can accurately locate the position of area A, ensuring that the total thickness, coating removal, and single-sided thickness measurements are all completed within the same area A.

[0107] Step S220: If it is determined from the above sensing data that the conductor of the target area of ​​the electrode has moved to the first measuring probe, then the conductor is controlled to stop moving forward, and the first measuring probe is driven to measure the thickness of the target area to obtain the total thickness δ of the target area.

[0108] The thickness measurement can be performed in a non-contact manner, such as using a laser thickness gauge; or it can be performed using a thickness gauge or height gauge. This embodiment does not limit the specific measurement method or equipment used.

[0109] Step S230: Control the conveyor belt to resume forward movement. If the conveyor belt in the target area is determined to have moved to the decoating device based on the sensing data, control the conveyor belt to stop moving forward and drive the decoating device to remove the single-sided coating of the target area.

[0110] The coating removal device can be a scraper, milling cutter, air grinder, or ultrasonic device, etc., and there are no restrictions.

[0111] The coating can be removed by scraping with a scraper or milling cutter, grinding with a high-speed air grinder, or removing powder with ultrasonic cleaning.

[0112] Specifically, the method used to remove the single-sided coating layer from the target area can be selected based on the size of the target area to be measured and the thickness of the coating layer; there are no restrictions here.

[0113] Step S240: Control the conveyor belt to resume forward movement. If, based on the sensing data, it is determined that the conveyor belt of the target area after the removal of the single-sided coating has moved to the second measuring probe, then control the conveyor belt to stop moving forward and drive the second measuring probe to measure the thickness of the target area after the removal of the single-sided coating to obtain the single-sided thickness δ1 of the target area.

[0114] It should be understood that, under the control of the mechanical device, the above steps S210 to S240, through the first measuring probe, the removal of the single-sided coating layer, and the second measuring probe, can automatically measure the total thickness of the target area of ​​the electrode and the single-sided thickness of the target area of ​​the electrode after the coating layer is removed online. This not only shortens the measurement time but also has high accuracy, which can improve the detection efficiency of subsequent coating uniformity and greatly enhance the user experience.

[0115] In the above Figure 2 Based on the embodiment of the electrode thickness measurement method shown, step S220 drives the first measuring probe to measure the thickness of the target region to obtain the total thickness δ of the target region, which can be achieved through the following steps:

[0116] Step 21: Drive the first measuring probe to each measuring point in the target area in sequence, so that the first measuring probe can measure the thickness at each measuring point in sequence to obtain the total thickness of each measuring point.

[0117] Correspondingly, step S230 drives the second measuring probe to measure the thickness of the target area, obtaining the single-sided thickness δ1 of the target area, which can be achieved through the following steps:

[0118] Step 22: Drive the second measuring probe to each of the above measuring points in sequence, so that the second measuring probe can measure the thickness at each of the above measuring points in sequence, and obtain the single-sided thickness of each of the above measuring points.

[0119] It should be understood that in steps 21 to 22 above, the mechanical device can control the first and second measuring probes to perform measurements at multiple measuring points in the target area, obtaining multiple total thicknesses and single-sided thicknesses that correspond one-to-one with the multiple total thicknesses. The subsequent coating inspection equipment can judge the uniformity of electrode coating based on at least one set of total thicknesses and single-sided thicknesses, which can improve the accuracy of the judgment and enhance the user experience.

[0120] In the above Figure 2Based on the embodiment of the electrode thickness measurement method shown, the above-mentioned measuring device further includes a powder suction device. After step S230 drives the above-mentioned coating removal device to remove the single-sided coating layer of the target area, the following steps may also be included:

[0121] Step 23: Drive the above-mentioned powder suction device to clean the surface particles and floating powder of the target area.

[0122] In some embodiments, since surface particles and loose powder will be present on the surface of the target area after the single-sided coating of the target area is removed, in order to reduce measurement errors, after removing the single-sided coating of the target area of ​​the electrode, the surface particles and loose powder of the target area of ​​the electrode can be cleaned away by a powder suction device such as a negative pressure powder suction device.

[0123] It should be understood that in step 23 above, after removing the single-sided coating layer of the target area, the surface particles and loose powder of the target area of ​​the electrode are cleaned away using a powder suction device. Then, the single-sided thickness of the target area is measured. This measurement accuracy is higher, which can improve the efficiency of subsequent coating uniformity detection and greatly enhance the user experience.

[0124] The following example illustrates the testing of the uniformity of coating on both sides of a nickel-metal hydride battery electrode during the wet slurry drawing process:

[0125] It is known that the current collector used for the battery electrode is a perforated nickel-plated steel strip, and the thickness specification value δ0 of the current collector is 0.04mm; the allowable deviation of the single-sided thickness process of the electrode is Δδ 0.03mm, that is, the coating thickness difference between side A and side B is within 0.03mm to be considered qualified; the width of the current collector is 190mm, and the direction of the strip during the slurry drawing process is perpendicular to the width of the current collector.

[0126] The preset inspection frequency interval ΔT is every 30 minutes; the preset measurement points n for a single inspection are 3; the preset measurement points are arranged according to the principle of basically covering the width of the electrode sheet and the 3 measurement points are equally distributed, and the distance L from the edge of the current collector is selected as 70mm, 120mm and 170mm respectively.

[0127] For ease of explanation, the measurement points are defined as points a, b, and c, and the total thicknesses corresponding to the three measurement points are δ(a), δ(b), and δ(c); the single-sided thicknesses corresponding to the three measurement points after removing the coating are δ1(a), δ1(b), and δ1(c).

[0128] First, enter the values ​​of δ0, Δδ, ΔT, n, and L into the parameter setting interface of the coating inspection equipment.

[0129] In some embodiments, the measuring probe uses laser thickness measurement, and each measuring probe includes two coaxial laser probes that are simultaneously scanning upwards and downwards. The coating removal device uses an air grinding gun to grind off the coating.

[0130] When the sensor detects that the conveyor belt of the area to be measured A has moved to the first laser probe, the conveyor belt stops moving forward. The mechanical device drives the laser probe to move a corresponding distance L, and sequentially reaches points a, b and c to measure the total thickness. The measured total thickness δ(a), δ(b) and δ(c) are output to the coating inspection equipment through the serial communication interface connected to the first laser probe.

[0131] After the measurement is completed, the conveyor belt resumes its forward movement. When the sensor detects that the conveyor belt in the test area A has moved to the coating removal device, the conveyor belt stops moving forward. The mechanical device drives the air grinder to move a corresponding distance L, sequentially reaching points a, b, and c. The air grinder rotates at high speed to remove the single-sided coating layer at points a, b, and c, and removes surface particles and floating powder through the negative pressure powder suction channel.

[0132] After the surface particles and loose powder are cleaned, the conveyor belt resumes its forward movement. When the sensor detects that the conveyor belt in the test area A has moved to the second laser probe, the conveyor belt stops moving forward. The mechanical device drives the second laser probe to move a corresponding distance L, sequentially reaching points a, b, and c. The second laser probe measures the single-sided thickness at points a, b, and c, and outputs the measured total thicknesses δ1(a), δ1(b), and δ1(c) to the coating inspection equipment through the serial communication interface connected to the second measuring probe.

[0133] After the measurement is completed, the coating inspection equipment automatically calculates whether the measurement results meet the following three conditions:

[0134] (δ(a)-δ0) / 2-Δδ / 2≤δ1(a)≤(δ(a)-δ0) / 2+Δδ / 2

[0135] (δ(b)-δ0) / 2-Δδ / 2≤δ1(b)≤(δ(b)-δ0) / 2+Δδ / 2

[0136] (δ(c)-δ0) / 2-Δδ / 2≤δ1(c)≤(δ(c)-δ0) / 2+Δδ / 2

[0137] After the calculation is completed, the judgment conclusion is given:

[0138] When conditions ①②③ are all met, the coating testing equipment will determine the result as "qualified"; otherwise, the result will be "unqualified", and specific unqualified measurement points will be given.

[0139] Optionally, the coating inspection equipment may also include an audible and visual alarm, which prompts the operator to check the non-compliant measurement points and make corresponding adjustments in the coating process when the inspection result is "non-compliant".

[0140] Corresponding to the above Figure 1 The method shown, Figure 3 The illustration shows an electrode coating uniformity detection device M100 provided in an embodiment of this application. This electrode coating uniformity detection device M100 can be built into the coating detection equipment of an electrode coating detection system, and includes:

[0141] The first acquisition module M110 is used to acquire the total thickness δ of the target area of ​​the electrode sheet before rolling the electrode sheet.

[0142] The second acquisition module M120 is used to acquire the single-sided thickness δ1 of the target area after removing the single-sided coating layer.

[0143] The judgment module M130 is used to determine whether the coating uniformity of the two sides of the electrode is qualified based on the total thickness δ and the single-sided thickness δ1.

[0144] Optionally, the system further includes a measuring device, which includes a first measuring probe and a second measuring probe. The first measuring probe and the second measuring probe communicate with the coating detection device. The first acquisition module M110 includes:

[0145] The first receiving unit is used to receive the total thickness δ measured by the first measuring probe;

[0146] Correspondingly, the second acquisition module M120 includes:

[0147] The second receiving unit is used to receive the single-sided thickness δ1 measured by the second measuring probe.

[0148] Optionally, the total thickness δ of the target region of the electrode is the first thickness measured by the first measuring probe at the target measuring point in the target region, where the target measuring point is one of the n measuring points in the target region, and n is greater than or equal to 1;

[0149] The single-sided thickness δ1 of the target area is the second thickness measured by the second measuring probe at the target measuring point of the target area after the single-sided coating layer has been removed;

[0150] The judgment module M130 includes:

[0151] The judgment unit is used to determine whether the coating uniformity of the two sides of the electrode sheet is qualified based on the first thickness measured sequentially at the n measurement points and the second thickness measured sequentially at the n measurement points.

[0152] It is understood that the various implementation methods and combinations of implementation methods in the above embodiments and their beneficial effects are also applicable to this embodiment, and will not be repeated here.

[0153] Corresponding to the above Figure 2 The method shown, Figure 4 The illustration shows a measuring device M200 provided in an embodiment of this application. The measuring device M200 is an electrode thickness measuring device, which can be combined with a coating detection device to form an electrode coating detection system to detect the uniformity of coating on both sides of the electrode. The measuring device M200 includes: a sensor M210, a mechanical device M220, a first measuring probe M230, a second measuring probe M240, and a coating removal device M250.

[0154] The sensor M210 is used to sense the movement position of the conveyor belt in the target area of ​​the electrode sheet;

[0155] The first measuring probe M230 is used to measure the thickness of the target area to obtain the total thickness δ of the target area;

[0156] The coating removal device M250 is used to remove the single-sided coating layer of the target area;

[0157] The second measuring probe M240 is used to measure the thickness of the target area after the single-sided coating layer is removed, and to obtain the single-sided thickness δ1 of the target area;

[0158] The mechanical device M220 is configured to: if, based on the sensing data from the sensor M210, the conveyor belt of the target area of ​​the electrode sheet is determined to have moved to the first measuring probe M230, control the conveyor belt to stop moving forward and drive the first measuring probe M230 to measure the thickness of the target area; control the conveyor belt to resume moving forward; if, based on the sensing data from the sensor M210, the conveyor belt of the target area is determined to have moved to the decoating device M250, control the conveyor belt to stop moving forward and drive the decoating device M250 to remove the single-sided coating of the target area; control the conveyor belt to resume moving forward; if, based on the sensing data from the sensor M210, the conveyor belt of the target area after the single-sided coating has been removed is determined to have moved to the second measuring probe M240, control the conveyor belt to stop moving forward and drive the second measuring probe M240 to measure the thickness of the target area after the single-sided coating has been removed.

[0159] Figure 5This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 5 As shown, the electronic device D10 of this embodiment includes: at least one processor D100 ( Figure 5 Only one is shown in the diagram. A processor, a memory D101, and a computer program D102 stored in the memory D101 and executable on the at least one processor D100, wherein the processor D100 executes the computer program D102 to implement the steps in any of the above method embodiments. Alternatively, the processor D100 executes the computer program D102 to implement the functions of each module / unit in the above device embodiments, for example... Figure 3 The functions of modules M110 to M130 are shown.

[0160] In some embodiments, when the processor D100 executes the computer program D102, it performs the following steps:

[0161] Before rolling the electrode sheet, the total thickness δ of the target area of ​​the electrode sheet is obtained;

[0162] Obtain the single-sided thickness δ1 of the target area after removing the single-sided coating layer;

[0163] The coating uniformity of the two sides of the electrode is determined based on the total thickness δ and the single-sided thickness δ1.

[0164] When the processor D100 executes the computer program D102, the process of obtaining the total thickness δ of the target area of ​​the electrode sheet can be achieved through the following steps:

[0165] Receive the total thickness δ obtained by the first measuring probe;

[0166] When the processor D100 executes the computer program D102, the acquisition of the single-sided thickness δ1 of the target area after removing the single-sided coating can be achieved through the following steps:

[0167] The single-sided thickness δ1 is obtained by receiving the measurement from the second measuring probe.

[0168] When the processor D100 executes the computer program D102, the total thickness δ of the target region of the electrode is the first thickness measured by the first measuring probe at the target measuring point in the target region. The target measuring point is one of the n measuring points in the target region, where n is greater than or equal to 1.

[0169] The single-sided thickness δ1 of the target area is the second thickness measured by the second measuring probe at the target measuring point of the target area after the single-sided coating layer has been removed;

[0170] Correspondingly, when the processor D100 executes the computer program D102, the following steps can be used to determine whether the coating uniformity of the two sides of the electrode sheet is qualified based on the total thickness δ and the single-sided thickness δ1:

[0171] The coating uniformity of the two sides of the electrode is determined based on the first thickness measured sequentially at the n measurement points and the second thickness measured sequentially at the n measurement points.

[0172] The electronic device D10 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. This electronic device may include, but is not limited to, a processor D100 and a memory D101. Those skilled in the art will understand that... Figure 5 This is merely an example of electronic device D10 and does not constitute a limitation on electronic device D10. It may include more or fewer components than shown, or combine certain components, or different components, such as input / output devices, network access devices, etc.

[0173] The processor D100 can be a Central Processing Unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0174] In some embodiments, the memory D101 may be an internal storage unit of the electronic device D10, such as a hard disk or memory of the electronic device D10. In other embodiments, the memory D101 may be an external storage device of the electronic device D10, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the electronic device D10. Furthermore, the memory D101 may include both internal and external storage units of the electronic device D10. The memory D101 is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory D101 can also be used to temporarily store data that has been output or will be output.

[0175] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0176] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0177] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the steps in the above-described method embodiments.

[0178] This application provides a computer program product that, when run on an electronic device, enables the electronic device to implement the steps described in the various method embodiments above.

[0179] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographic device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0180] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0181] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0182] In the embodiments provided in this application, it should be understood that the disclosed apparatus / network devices and methods can be implemented in other ways. For example, the apparatus / network device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0183] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0184] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for detecting the uniformity of electrode coating, characterized in that, In a coating inspection device applied to an electrode coating inspection system, the method includes: Before rolling the electrode sheet, the total thickness δ of the target area of ​​the electrode sheet is obtained; Obtain the single-sided thickness δ1 of the target area after removing the single-sided coating layer; The coating uniformity of the two sides of the electrode is judged to be qualified based on the total thickness δ and the single-sided thickness δ1: Judgment condition 1: (δ-δ0) / 2-Δδ / 2≤δ1≤(δ-δ0) / 2+Δδ / 2; Where Δδ is the preset allowable error for the thickness of a single side of the electrode, and δ0 is the thickness of the current collector.

2. The method for detecting the uniformity of electrode coating as described in claim 1, characterized in that, The system further includes a measuring device, which comprises a first measuring probe and a second measuring probe. The first measuring probe and the second measuring probe communicate with the coating detection device to obtain the total thickness δ of the target area of ​​the electrode, including: Receive the total thickness δ measured by the first measuring probe; Correspondingly, obtaining the single-sided thickness δ1 of the target area after removing the single-sided coating layer includes: The single-sided thickness δ1 obtained by the second measuring probe is received.

3. The method for detecting the uniformity of electrode coating as described in claim 2, characterized in that, The total thickness δ of the target region of the electrode is the first thickness measured by the first measuring probe at the target measuring point in the target region. The target measuring point is one of the n measuring points in the target region, where n is greater than or equal to 1. The single-sided thickness δ1 of the target area is the second thickness measured by the second measuring probe at the target measuring point of the target area after the single-sided coating layer has been removed; Determining whether the coating uniformity of the two sides of the electrode is qualified based on the total thickness δ and the single-sided thickness δ1 includes: The coating uniformity of the two sides of the electrode is determined based on the first thickness measured sequentially at the n measurement points and the second thickness measured sequentially at the n measurement points.

4. A method for measuring electrode thickness, wherein the method, when executed, implements the electrode coating uniformity detection method as described in claim 1, characterized in that, In the mechanical device of a measuring equipment used in an electrode coating inspection system, the measuring equipment further includes a sensor, a first measuring probe, a second measuring probe, and a coating removal device, and the method includes: Acquire the sensor data; If the target area of ​​the electrode is determined to have moved to the first measuring probe based on the sensing data, the tape is controlled to stop moving forward, and the first measuring probe is driven to measure the thickness of the target area to obtain the total thickness δ of the target area. Control the conveyor belt to resume forward movement. If the sensing data determines that the conveyor belt in the target area has moved to the decoating device, then control the conveyor belt to stop moving forward and drive the decoating device to remove the single-sided coating of the target area. If the conveyor belt is controlled to resume forward movement, and it is determined from the sensing data that the conveyor belt of the target area after the removal of the single-sided coating has moved to the second measuring probe, then the conveyor belt is controlled to stop moving forward, and the second measuring probe is driven to measure the thickness of the target area after the removal of the single-sided coating to obtain the single-sided thickness δ1 of the target area.

5. The method for measuring electrode thickness as described in claim 4, characterized in that, The step of driving the first measuring probe to measure the thickness of the target region and obtaining the total thickness δ of the target region includes: The first measuring probe is driven to reach each measuring point in the target area in sequence, so that the first measuring probe can measure the thickness at each measuring point in sequence to obtain the total thickness of each measuring point. Correspondingly, the step of driving the second measuring probe to measure the thickness of the target region to obtain the single-sided thickness δ1 of the target region includes: The second measuring probe is driven to reach each measuring point in sequence, so that the second measuring probe can measure the thickness at each measuring point in sequence to obtain the single-sided thickness of each measuring point.

6. The method for measuring electrode thickness as described in claim 5, characterized in that, The measuring device further includes a powder suction device, and after the decoating device is driven to remove the single-sided coating layer of the target area, it further includes: The powder suction device is driven to clean the surface particles and loose powder in the target area.

7. A device for detecting the uniformity of electrode coating, characterized in that, The coating inspection equipment built into the electrode coating inspection system includes: The first acquisition module is used to acquire the total thickness δ of the target area of ​​the electrode sheet before rolling the electrode sheet. The second acquisition module is used to acquire the single-sided thickness δ1 of the target area after removing the single-sided coating layer; The judgment module is used to determine whether the coating uniformity of the two sides of the electrode is qualified based on the total thickness δ and the single-sided thickness δ1. Judgment condition 1: (δ-δ0) / 2-Δδ / 2≤δ1≤(δ-δ0) / 2+Δδ / 2; Where Δδ is the preset allowable error for the thickness of a single side of the electrode, and δ0 is the thickness of the current collector.

8. A measuring device, wherein the device, when executed, implements the method for detecting the uniformity of electrode coating as described in claim 1, characterized in that, include: Sensor, mechanical device, first measuring probe, second measuring probe, and coating removal device; The sensor is used to sense the movement position of the conveyor belt in the target area of ​​the electrode sheet; The first measuring probe is used to measure the thickness of the target area to obtain the total thickness δ of the target area; The coating removal device is used to remove the single-sided coating layer of the target area; The second measuring probe is used to measure the thickness of the target area after the single-sided coating layer is removed, so as to obtain the single-sided thickness δ1 of the target area; The mechanical device is configured to: if, based on the sensor data, the conveyor belt of the target area of ​​the electrode is determined to have moved to the first measuring probe, control the conveyor belt to stop moving forward and drive the first measuring probe to measure the thickness of the target area; control the conveyor belt to resume moving forward; if, based on the sensor data, the conveyor belt of the target area is determined to have moved to the decoating device, control the conveyor belt to stop moving forward and drive the decoating device to remove the single-sided coating of the target area; control the conveyor belt to resume moving forward; if, based on the sensor data, the conveyor belt of the target area after the single-sided coating has been removed is determined to have moved to the second measuring probe, control the conveyor belt to stop moving forward and drive the second measuring probe to measure the thickness of the target area after the single-sided coating has been removed.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that, When the processor executes the computer program, it implements the method for detecting the uniformity of electrode coating as described in any one of claims 1 to 3.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for detecting the uniformity of electrode coating as described in any one of claims 1 to 3.

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