Method and equipment for automatically detecting and adjusting weight loss ratio of pole piece

Abstract

The embodiment of the invention relates to the field of batteries, and provides a method and equipment for automatically detecting and adjusting the weight loss ratio of a pole piece, and the method comprises the steps: providing drying equipment to dry the pole piece; providing a moisture content analyzer to measure the moisture content of the dried pole piece in real time; providing a programmable logic controller for obtaining the actual weight loss ratio of the dried pole piece based on the water content, setting a target weight loss ratio in the programmable logic controller, obtaining the actual error at the current moment based on the actual weight loss ratio and the target weight loss ratio, and if the actual error at the current moment meets a preset condition, sending the preset condition to the controller; the actual error serves as a current error, an expected error is obtained based on all the actual errors obtained within a previous preset time period including the current moment, an adjusting amount is obtained based on the current error and the expected error, and working parameters of the drying equipment are adjusted based on the adjusting amount so as to adjust the weight loss rate of the pole piece. The embodiment of the invention is at least beneficial to improving the qualified rate of the pole piece and reducing the preparation cost of the pole piece.

Description

Technical Field

[0001] The disclosed embodiments relate to the field of battery processing technology, and in particular to a method and device for automatically detecting and adjusting the weight loss rate of a pole piece. Background Art

[0002] In the manufacturing process of battery cells, in order to prepare pole pieces with a weight loss rate that meets the standard, drying the pole pieces is a key process in pole piece manufacturing. In the process of drying the pole pieces, controlling the drying process to control the degree of drying of the pole pieces is a key process to ensure that the weight loss rate of the pole pieces meets the standard. At present, in order to understand the degree of drying of the pole pieces by the drying process, it is mainly achieved by sampling the pole pieces after drying and measuring their weight loss rate.

[0003] However, sampling the dried electrodes requires suspending the electrode production process. This sampling method is cumbersome, time-consuming and labor-intensive, which not only affects the production efficiency of the electrodes, but also easily causes the electrodes off the production line to be scrapped during the inspection process, greatly affecting the production cost of the electrodes. Moreover, it is impossible to achieve real-time inspection and adjustment of the electrodes in the production process. Summary of the invention

[0004] The embodiments of the present disclosure provide a method and device for automatically detecting and adjusting the weight loss rate of a pole piece, which is at least beneficial to improving the qualified rate of the pole piece and reducing the cost of preparing the pole piece.

[0005] According to some embodiments of the present disclosure, on the one hand, an embodiment of the present disclosure provides a method for automatically detecting and adjusting the weight loss rate of an electrode, comprising: providing a drying device for drying the electrode; providing a moisture content analyzer for real-time measuring the moisture content of the electrode after drying after passing through the detection area of ​​the moisture content analyzer; providing a programmable logic controller for obtaining the actual weight loss rate of the electrode after drying based on the moisture content, and adjusting the working parameters of the drying device based on the actual weight loss rate to adjust the weight loss rate of the electrode after subsequent drying; wherein, the step of adjusting the working parameters of the drying device based on the actual weight loss rate comprises: setting a target weight loss rate in the programmable logic controller; obtaining an actual error at a current moment based on the actual weight loss rate and the target weight loss rate; if it is determined that the actual error at the current moment meets a preset condition, taking the actual error at the current moment as the current error; obtaining an expected error based on all the actual errors obtained in a previous preset time period including the current moment; obtaining an adjustment amount based on the current error and the expected error; and adjusting the working parameters of the drying device based on the adjustment amount.

[0006] In some embodiments, the expected error includes an integral error and a differential error, and the step of obtaining the expected error includes: performing an integral operation on all the actual errors obtained in the preset time period including the current moment to obtain the integral error; performing a differential operation on all the actual errors obtained in the preset time period including the current moment to obtain the differential error; the adjustment amount, the current error, the integral error and the differential error satisfy the following relationship:

[0007] D=(K p *E1)+(K i *E2)+(K d *E3)

[0008] Wherein, D is the adjustment amount, K p is the first coefficient, K i is the second coefficient, K d is the third coefficient, E1 is the current error, E2 is the integral error, and E3 is the differential error.

[0009] In some embodiments, the method of automatically detecting and adjusting the electrode weight loss rate also includes: adjusting the first coefficient, and / or the second coefficient, and / or the third coefficient according to the material or size of the electrode, the model of the drying equipment, the production environment in which the electrode is located, or the different operating parameters of the drying equipment.

[0010] In some embodiments, the first coefficient is 0.1 to 3; and / or, the second coefficient is 5 to 11; and / or, the third coefficient is 0 to 0.5.

[0011] In some embodiments, the step of determining whether the actual error at the current moment satisfies the preset condition includes: if it is determined that the actual error is greater than a first preset value or less than a second preset value, then the actual error satisfies the preset condition; wherein, the first preset value is -0.05% to 0.05%, and the second preset value is -0.2% to -0.1%.

[0012] In some embodiments, the step of obtaining all the actual errors within the previous preset time period including the current moment includes: obtaining the moving speed of the electrode in the drying device; obtaining the transmission distance required for the electrode to reach the detection area of ​​the moisture content analyzer after leaving the drying device; obtaining the preset time period based on the moving speed and the transmission distance; wherein the moving speed, the transmission distance and the preset time period satisfy the following relationship:

[0013]

[0014] Among them, T is the preset time period, V is the moving speed of the electrode in the drying equipment, and S is the transmission distance required for the electrode to reach the detection area of ​​the moisture content analyzer after leaving the drying equipment.

[0015] In some embodiments, along the moving direction of the pole piece, the drying equipment includes a circulating air outlet box located at the front end and a circulating air inlet box located at the rear end; the step of providing the moisture content analyzer includes: along the width direction of the pole piece, the detection area of ​​the moisture content analyzer is fixedly set on the area of ​​the pole piece close to the circulating air inlet box; and / or, providing the moisture content analyzer designed based on the ultra-high frequency resonance principle.

[0016] In some embodiments, the step of adjusting the working parameters of the drying device includes: adjusting the wind frequency of the drying device, or adjusting the drying temperature of the drying device.

[0017] In some embodiments, the drying equipment includes N ovens connected in sequence along the moving direction of the electrode piece, and at least part of the working parameters of each oven are independently adjusted; the step of adjusting the working parameters of the drying equipment based on the adjustment amount includes: adjusting the wind frequency of the M ovens closest to the moisture content analyzer based on the adjustment amount, or adjusting the drying temperature of the M ovens closest to the moisture content analyzer based on the adjustment amount; wherein N is greater than M, and N and M are both positive integers.

[0018] According to some embodiments of the present disclosure, on the other hand, the embodiments of the present disclosure further provide a device for automatically detecting and adjusting the weight loss rate of an electrode, comprising: a drying device, configured to dry the electrode; a moisture content analyzer, configured to measure in real time the moisture content of the electrode after drying that passes through the detection area of ​​the moisture content analyzer, and along the moving direction of the electrode, a electrode traction position is provided at the tail end of the drying device, and the moisture content analyzer is provided at the electrode traction position; a programmable logic controller that is respectively connected to the drying device and the moisture content analyzer for communication, and is configured to obtain the actual weight loss rate of the electrode after drying based on the moisture content; set a target weight loss rate, and obtain the actual error at the current moment based on the actual weight loss rate and the target weight loss rate; if it is determined that the actual error at the current moment meets the preset condition, use the actual error at the current moment as the current error; obtain an expected error based on all the actual errors obtained in the previous preset time period including the current moment; obtain an adjustment amount based on the current error and the expected error; and adjust the working parameters of the drying device based on the adjustment amount to adjust the weight loss rate of the electrode after subsequent drying.

[0019] The technical solution provided by the embodiments of the present disclosure has at least the following advantages:

[0020] On the one hand, the actual weight loss rate of the electrode after drying is obtained in real time with the help of a moisture content analyzer and a programmable logic controller, so as to realize real-time detection of the actual weight loss rate of the electrode. This is not only beneficial to improving the production efficiency of the electrode, but also beneficial to reducing the labor cost of preparing the electrode, and also beneficial to avoiding the problem of low detection accuracy or electrode damage due to human interference in the detection of the electrode. It is not only beneficial to improve the detection accuracy of the weight loss rate of the electrode, but also beneficial to improve the qualified rate of the electrode.

[0021] On the other hand, based on the real-time detection of the actual weight loss rate of the electrode, the working parameters of the drying equipment are controlled with the help of a programmable logic controller to achieve real-time closed-loop adjustment of the weight loss rate of the electrode after subsequent drying, which is beneficial to further improve the qualified rate of the electrode and further reduce the production cost of the electrode. Moreover, there is no need for excessive human intervention, which is beneficial to reduce the workload of operators.

[0022] On the other hand, in the step of analyzing and calculating the detection signal to obtain the adjustment amount, the programmable logic controller not only refers to the current error of the electrode that does not meet the standard at the current moment, but also refers to all actual errors obtained in the previous preset time period including the current moment. This is conducive to comprehensive consideration of the drying environment of the electrode within the preset time period, which is conducive to improving the accuracy of the obtained adjustment amount, and thus is conducive to achieving precise control of the weight loss rate of the electrode, so as to ensure an extremely high qualified rate of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, and these exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A flow chart of a method for automatically detecting and adjusting the weight loss rate of a pole piece provided in an embodiment of the present disclosure;

[0025] Figure 2 A schematic diagram of a local simplified structure corresponding to the method for automatically detecting and adjusting the weight loss rate of a pole piece provided in one embodiment of the present disclosure;

[0026] Figure 3 Another partial simplified structural schematic diagram corresponding to the method for automatically detecting and adjusting the pole piece weight loss rate provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] As can be seen from the background technology, the pass rate of pole pieces needs to be improved, and the preparation cost of pole pieces needs to be reduced.

[0028] The present disclosure implements a method and device for automatically detecting and adjusting the weight loss rate of the pole piece. In the method, on the one hand, the actual weight loss rate of the pole piece after drying is obtained in real time by means of a moisture content analyzer and a programmable logic controller, so as to realize the real-time detection of the actual weight loss rate of the pole piece, which is not only conducive to improving the production efficiency of the pole piece, but also conducive to reducing the labor cost of preparing the pole piece, and also conducive to avoiding the problem of low detection accuracy or pole piece damage due to human interference in the detection of the pole piece, which is not only conducive to improving the detection accuracy of the weight loss rate of the pole piece, but also conducive to improving the qualified rate of the pole piece. On the other hand, on the basis of real-time detection of the actual weight loss rate of the pole piece, the working parameters of the drying equipment are controlled by means of a programmable logic controller to realize real-time closed-loop adjustment of the weight loss rate of the pole piece after subsequent drying, which is conducive to further improving the qualified rate of the pole piece, so as to further reduce the production cost of the pole piece, and, without excessive human intervention, it is conducive to reducing the workload of operators. On the other hand, in the step of analyzing and calculating the detection signal to obtain the adjustment amount, the programmable logic controller not only refers to the current error of the electrode that does not meet the standard at the current moment, but also refers to all actual errors obtained in the previous preset time period including the current moment. This is conducive to comprehensive consideration of the drying environment of the electrode within the preset time period, which is conducive to improving the accuracy of the obtained adjustment amount, and thus is conducive to achieving precise control of the weight loss rate of the electrode, so as to ensure an extremely high qualified rate of the electrode.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] In the accompanying drawings corresponding to the embodiments of the present application, the thickness and area of ​​the layer are magnified for better understanding and ease of description. When describing a component (such as a layer, film, region or substrate) on another component or on the surface of another component, the component can be "directly" located on the surface of the other component, or a third component can be present between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0036] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise specified, other components are not excluded, and other components may be further included. In addition, when a component such as a layer, a film, a region, or a plate is referred to as being "on / located on" another component, it may be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may exist in between. In addition, when a component such as a layer, a film, a region, a plate, etc. is "directly located on" another component, or when a component such as a layer, a film, a region, a plate, etc. is located on the surface of another component, it means that no other components are located in between.

[0037] The terms used in the description of the various embodiments described herein are only used to describe specific embodiments and are not intended to be limiting. As used in the description of the various embodiments described and in the appended claims, "the components" are also intended to include plural forms unless the context clearly indicates otherwise. Among them, components include components such as layers, films, regions, or plates.

[0038] The following will describe the various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present disclosure, many technical details are provided in order to enable the reader to better understand the embodiments of the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the embodiments of the present disclosure can be implemented.

[0039] An embodiment of the present disclosure provides a method for automatically detecting and adjusting the weight loss rate of a pole piece. The method for automatically detecting and adjusting the weight loss rate of a pole piece provided by an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. Figure 1 A flow chart of a method for automatically detecting and adjusting the weight loss rate of a pole piece provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of a local simplified structure corresponding to the method for automatically detecting and adjusting the weight loss rate of a pole piece provided in one embodiment of the present disclosure; Figure 3 Another partial simplified structural schematic diagram corresponding to the method for automatically detecting and adjusting the pole piece weight loss rate provided in one embodiment of the present disclosure.

[0040] Combined with reference Figures 1 to 3 The method for automatically detecting and adjusting the weight loss rate of the pole piece includes the following steps:

[0041] Step S101 : providing a drying device 101 for drying the electrode 102 .

[0042] In some cases, the drying device 101 has a conveyor belt for conveying the electrode piece 102, and the conveyor belt conveys the preliminarily formed electrode piece 102 to the drying device 101 at a constant conveying speed for drying and further conveying it to the outside of the drying device 101. Specifically, the electrode piece 102 in the drying device 101 is conveyed while being dried, and then conveyed to the outside of the drying device 101 by the conveyor belt, and further conveyed to the detection area 113 of the moisture content analyzer 103 by the conveyor belt.

[0043] It should be noted that Figure 3 In the figure, the detection area 113 of the moisture content analyzer 103 is indicated by a dotted box on the electrode 102.

[0044] In some examples, the initially formed pole piece 102 may be prepared by a coating process.

[0045] Step S102 : providing a moisture content analyzer 103 for real-time measurement of the moisture content of the electrode 102 after drying that passes through the detection area 113 of the moisture content analyzer 103 .

[0046] In some cases, along the width direction Y of the pole piece 102, that is, along the direction perpendicular to the moving direction X of the pole piece 102, an area is selected on the pole piece 102 as the detection area 113 of the moisture content analyzer 103, and the moisture content of the pole piece 102 in the detection area 113 is tested to characterize the moisture content of the pole piece 102 per unit length. Therefore, there is no need to set up multiple moisture content analyzers 103, nor is there any need to make the moisture content analyzer 103 reciprocate along the width direction of the pole piece 102. It is only necessary to select a representative area on the pole piece 102 as the detection area 113 of the moisture content analyzer 103, which is conducive to simplifying the complexity of the equipment for automatically detecting and adjusting the weight loss rate of the pole piece and reducing the equipment cost.

[0047] It should be noted that, later, an exemplary description will be given on how to select a representative area on the electrode 102 as the detection area 113 of the moisture analyzer 103. In addition, in practical applications, based on the change in the size of the electrode to be prepared, the size of the detection area of ​​the moisture analyzer can be adaptively adjusted, or multiple moisture analyzers can be provided to simultaneously detect the moisture content of different areas on the electrode, or at least one moisture analyzer can be reciprocated along the width direction of the electrode.

[0048] Step S103: providing a programmable logic controller 104 for obtaining the actual weight loss rate of the electrode 102 after drying based on the moisture content, and adjusting the working parameters of the drying equipment 101 based on the actual weight loss rate to adjust the weight loss rate of the electrode 102 after subsequent drying.

[0049] The step of adjusting the working parameters of the drying equipment 101 based on the actual weight loss rate in step S103 includes: setting the target weight loss rate in the programmable logic controller 104; obtaining the actual error at the current moment based on the actual weight loss rate and the target weight loss rate; if it is determined that the actual error at the current moment meets the preset conditions, the actual error at the current moment is used as the current error; obtaining the expected error based on all actual errors obtained in the previous preset time period including the current moment; obtaining the adjustment amount based on the current error and the expected error; and adjusting the working parameters of the drying equipment 101 based on the adjustment amount to adjust the weight loss rate of the electrode 102 after subsequent drying.

[0050] It is worth noting that during the production process of the electrode 102 , on the one hand, the actual weight loss rate of the electrode 102 after drying is obtained in real time with the help of the moisture content analyzer 103 and the programmable logic controller 104 to achieve real-time detection of the actual weight loss rate of the electrode 102 . Therefore, based on the real-time detection of the actual weight loss rate of the electrode 102, the sampling of the electrode 102 is effectively avoided, so that there is no need to suspend the production process of the electrode 102. Firstly, it is beneficial to avoid the labor consumption generated for sampling, which is not only beneficial to improve the production efficiency of the electrode 102, but also beneficial to reduce the labor cost of preparing the electrode 102; secondly, the detection of the weight loss rate of the electrode 102 can be carried out on the production line of the electrode 102, without the electrode 102 being separated from the production line, and the operator will not directly contact the electrode 102, which is beneficial to avoid the problem of low detection accuracy or damage of the electrode 102 due to human interference in the detection of the electrode 102, which is not only beneficial to improve the detection accuracy of the weight loss rate of the electrode 102, but also beneficial to improve the qualified rate of the electrode 102, and avoid waste of materials for preparing the electrode 102.

[0051] On the other hand, on the basis of real-time detection of the actual weight loss rate of the electrode 102, the programmable logic controller 104 is also used to control the working parameters of the drying device 101 to achieve real-time closed-loop adjustment of the weight loss rate of the electrode 102 after subsequent drying. In other words, the moisture content analyzer 103 provides the programmable logic controller 104 with a detection signal, that is, the moisture content of the electrode 102 after drying; the programmable logic controller 104 then analyzes and calculates the detection signal, and outputs a control signal for adjusting the working parameters of the drying device 101, so that the drying device 101 adjusts the moisture content of the electrode 102 in the subsequent drying process, thereby achieving automatic closed-loop adjustment of the electrode 102, which is conducive to further improving the qualified rate of the electrode 102, so as to further reduce the production cost of the electrode 102. Moreover, the programmable logic controller 104 automatically adjusts the working parameters of the drying device 101 based on the subsequent detection signal, without excessive human intervention, which is conducive to reducing the workload of operators, thereby further reducing the labor cost in the production process of the electrode 102.

[0052] On the other hand, a target weight loss rate is set in the programmable logic controller 104, and this is used as a standard to judge the error in the weight loss rate of the detected pole piece 102. If the programmable logic controller 104 judges that the actual error at the current moment meets the preset conditions, it means that the weight loss rate of the pole piece 102 measured at the current moment does not meet the standard. Based on this, in the step of analyzing and calculating the detection signal to obtain the adjustment amount, the programmable logic controller 104 not only refers to the current error of the pole piece 102 that does not meet the standard at the current moment, but also refers to all the actual errors obtained in the previous preset time period including the current moment, which is conducive to comprehensive consideration of the drying environment of the pole piece 102 in the preset time period, and is conducive to improving the accuracy of the obtained adjustment amount, and effectively avoiding the phenomenon that the pole piece 102 is scrapped due to excessive adjustment of the working parameters of the drying equipment 101 by the programmable logic controller 104, so as to achieve precise control of the weight loss rate of the pole piece 102, so as to ensure a very high qualified rate of the pole piece 102.

[0053] In other words, in the step of analyzing and calculating the detection signal to obtain the adjustment amount, the programmable logic controller 104 not only refers to the actual weight loss rate of the pole piece 102 that does not meet the standard at the current moment, but also considers all the actual weight loss rates obtained in the previous preset time period including the current moment. It should be noted that among all the actual weight loss rates obtained in the previous preset time period including the current moment, whether the actual error obtained by the programmable logic controller 104 based on the actual weight loss rate and the target weight loss rate meets the preset conditions, it can be used as calculation data for obtaining the expected error.

[0054] The embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0055] In some embodiments, the step of adjusting the working parameters of the drying device 101 includes: adjusting the wind frequency of the drying device 101, or adjusting the drying temperature of the drying device 101. In other words, the programmable logic controller 104 obtains the adjustment amount based on the current error and the expected error, including at least the following two situations: the adjustment amount is the adjustment amount of the wind frequency of the drying device 101, or the adjustment amount is the adjustment amount of the drying temperature of the drying device 101. It should be noted that the adjustment amount will be described in detail in conjunction with specific examples later, and will not be repeated here.

[0056] It should be noted that, on the basis that the programmable logic controller 104 obtains the adjustment amount based on the current error and the expected error, and automatically controls the working parameters of the drying device 101, a manual mode can also be set in the programmable logic controller 104, that is, the operator can manually input the specific value of the adjustment amount on the programmable logic controller 104, so as to further ensure that the weight loss rate of the electrode 102 after subsequent drying approaches the target weight loss rate. In practical applications, the wind frequency of the drying device and the drying temperature of the drying device can also be adjusted at the same time. For example, if the programmable logic controller determines that the moisture content of the electrode is too high based on the actual weight loss rate and the target weight loss rate, at least one of the wind frequency of the drying device and the drying temperature of the drying device can be controlled to increase; if the programmable logic controller determines that the moisture content of the electrode is too low based on the actual weight loss rate and the target weight loss rate, at least one of the wind frequency of the drying device and the drying temperature of the drying device can be controlled to decrease.

[0057] In some embodiments, the expected error includes an integral error and a differential error, and the step of obtaining the expected error includes: performing an integral operation on all actual errors obtained in a previous preset time period including the current moment to obtain an integral error; performing a differential operation on all actual errors obtained in a previous preset time period including the current moment to obtain a differential error; the adjustment amount, the current error, the integral error, and the differential error satisfy the following relationship:

[0058] D=(K p *E1)+(K i *E2)+(K d *E3)

[0059] Among them, D is the adjustment amount, K p is the first coefficient, K i is the second coefficient, K d is the third coefficient, E1 is the current error, E2 is the integral error, and E3 is the differential error.

[0060] It is worth noting that for the programmable logic controller 104, if it is determined that the actual error at the current moment meets the preset conditions, the programmable logic controller 104 will use a proportional-integral-derivative control (PID) algorithm for all actual errors obtained in the previous preset time period including the current moment to obtain the adjustment amount for controlling the working parameters of the drying equipment 101. Based on the characteristics of the PID algorithm, such as good robustness, high reliability, and the ability to analyze historical data to predict future changes, it is beneficial to achieve precise control of the working parameters of the drying equipment 101 by the programmable logic controller 104, improve the accuracy of the obtained adjustment amount, and thus help to ensure a very high yield rate of the electrode 102. Moreover, based on the PID algorithm for the actual error in the preset time period in the programmable logic controller 104, real-time closed-loop adjustment of the weight loss rate of the electrode 102 after subsequent drying can be achieved.

[0061] Among them, K p , K i and K d As three constants in the programmable logic controller 104, they can be used to adjust the sensitivity and stability of the programmable logic controller 104 in controlling the working parameters of the drying device 101. Among them, the first coefficient K p Can be used to determine the approximate range of the adjustment amount; the second coefficient K i It can be used to reduce the actual weight loss rate error of the pole piece 102 in static state, so that the actual weight loss rate of the pole piece 102 is as close as possible to the set target weight loss rate, avoiding the error based on the first coefficient K p and the third coefficient K d The obtained adjustment amount makes the weight loss rate of the pole piece 102 deviate too much from the target weight loss rate; the third coefficient K d It can be used to control the actual weight loss rate of the pole piece 102 during the production process within a certain fluctuation range, and further promote the fluctuation range of the actual weight loss rate of the pole piece 102 during the production process to approach 0, so as to reduce or even avoid the fluctuation of the actual weight loss rate of the pole piece 102 during the production process.

[0062] In other words, the steps of the programmable logic controller 104 to obtain the adjustment amount based on the current error and the expected error include the following three links: proportional link, integral link and differential link. Among them, the proportional link can immediately and proportionally reflect the error between the actual weight loss rate and the target weight loss rate of the pole piece 102, and immediately produce a control effect to reduce the error. When the error is zero, the control effect is also zero; the integral link can memorize the error, which is mainly used to eliminate static error and improve the system's error-free. The strength of the integral link depends on the second coefficient K i , the second coefficient K iThe larger the value, the weaker the integral effect, and vice versa. The differential link can reflect the changing trend or rate of change of the error, and can adjust the error based on the third coefficient K before the error becomes too large. d The error can be corrected early, thereby speeding up the operation of the programmable logic controller 104 and reducing the adjustment time.

[0063] In some embodiments, the method for automatically detecting and adjusting the weight loss rate of the electrode piece may further include: adjusting the first coefficient K according to the material or size of the electrode piece 102, the model of the drying device 101, the production environment of the electrode piece 102, or the type of the operating parameter of the drying device 101 to be adjusted. p , and / or the second coefficient K i , and / or the third coefficient K d .

[0064] In other words, the first coefficient K p , the second coefficient K i and the third coefficient K d The values ​​of the three can be adjusted according to the actual situation to ensure that the adjustment amount obtained by the programmable logic controller 104 based on the current error, integral error and differential error meets the requirements, that is, the weight loss rate of the electrode 102 after subsequent drying is closer to the target weight loss rate. For example, when the adjustment amount is used to adjust the wind frequency of the drying device 101 and the adjustment amount is used to adjust the drying temperature of the drying device 101, the first coefficient K p The value of can be different, and / or the second coefficient K i The value of can be different, and / or the third coefficient K d The value of can be different. It is worth noting that when the first coefficient K p , the second coefficient K i and the third coefficient K d After the values ​​of the three are selected, the first coefficient K can be solidified without changing the material or size of the electrode 102, the model of the drying equipment 101, the production environment of the electrode 102, and the type of the operating parameters of the drying equipment 101. p , the second coefficient K i and the third coefficient K d The values ​​of the three are subsequently analyzed and calculated based only on the moisture content of the electrode 102 after drying to obtain the adjustment amount, which is conducive to parameter solidification and establishment of a more sound standardization.

[0065] In some examples, the adjustment amount is used to adjust the wind frequency of the drying device 101. Based on this, if the first coefficient K p The larger the value, the greater the amplitude of adjusting the wind frequency of the drying device 101; if the first coefficient K p The smaller it is, the more conservative the amplitude of adjusting the wind frequency of the drying device 101 is, that is, the smaller it is.

[0066] In some examples, the first coefficient K p , the second coefficient K i and the third coefficient K d The values ​​of the three can be set by the operator in the programmable logic controller 104. In other examples, the first coefficient K p , the second coefficient K i and the third coefficient K d The values ​​of the three are all set in a certain value range in the programmable logic controller 104. The programmable logic controller 104 can automatically select the first coefficient K to determine the value in the corresponding value range. p , the second coefficient K i and the third coefficient K d , and based on the subsequently obtained adjustment amount, determine whether the first coefficient K needs to be adjusted again p , the second coefficient K i and the third coefficient K d The value of at least one of the three.

[0067] In some embodiments, the first coefficient K p It can be 0.1 to 3. For example, the first coefficient K p It can be 0.15, 0.2, 0.25, 0.3, 0.35, 0.5, 0.8, 1, 1.2, 1.5, 1.6, 1.8, 2, 2.4, 2.5, 2.6 or 2.8, etc.

[0068] In some embodiments, the second coefficient K i is 5 to 11, for example, the second coefficient K i It can be 5.5, 6, 6.5, 6.8, 7, 7.2, 7.5, 8, 8.4, 8.5, 9, 9.5, 9.6, 10, 10.5 or 10.8, etc.

[0069] In some embodiments, the third coefficient K d is 0 to 0.5, for example, the third coefficient K d It can be 0.05, 0.1, 0.12, 0.15, 0.16, 0.18, 0.2, 0.24, 0.25, 0.28, 0.3, 0.35, 0.36, 0.4, 0.45 or 0.48, etc.

[0070] In some embodiments, the step of determining whether the actual error at the current moment satisfies a preset condition may include: if the actual error is determined to be greater than a first preset value or less than a second preset value, then the actual error satisfies the preset condition; wherein the first preset value is -0.05% to 0.05%, and the second preset value is -0.2% to -0.1%.

[0071] In some cases, the first preset value may be -0.04%, -0.03%, -0.02%, -0.01%, 0%, 0.01%, 0.02%, 0.03%, or 0.04%.

[0072] In some cases, the second preset value may be -0.19%, -0.18%, -0.17%, -0.16%, -0.15%, -0.14%, -0.13%, -0.12%, or -0.11%.

[0073] In some examples, the actual error obtained by the programmable logic controller 104 at the current moment based on the actual weight loss rate and the target weight loss rate refers to the difference obtained by subtracting the target weight loss rate from the actual weight loss rate. If it is judged that the actual error at the current moment is greater than 0%, the actual error meets the preset condition, which also indicates that the moisture content of the electrode 102 measured by the moisture content analyzer 103 at the current moment is too high, and the drying degree of the electrode 102 by the drying device 101 is not enough, then the programmable logic controller 104 can increase the wind frequency of the drying device 101 or the drying temperature of the drying device 101 by means of the adjustment amount obtained based on the current error and the expected error; if it is judged that the actual error at the current moment is less than or equal to -0.15%, the actual error meets the preset condition, which also indicates that the moisture content of the electrode 102 measured by the moisture content analyzer 103 at the current moment is too low, and the drying degree of the electrode 102 by the drying device 101 is too large, then the programmable logic controller 104 can reduce the wind frequency of the drying device 101 or the drying temperature of the drying device 101 by means of the adjustment amount obtained based on the current error and the expected error.

[0074] In some embodiments, the target weight loss rate may be 0.25% to 0.35%, for example, the target weight loss rate may be 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.31%, 0.32%, 0.33% or 0.34%.

[0075] In some cases, the value of the target weight loss rate may be set or modified by an operator in the programmable logic controller 104 .

[0076] In other cases, the value of the target weight loss rate is also set in a certain range of values ​​in the programmable logic controller 104. The programmable logic controller 104 can automatically select a target weight loss rate with a certain value in the corresponding value range, and judge whether the target weight loss rate needs to be adjusted again based on the adjustment amount obtained subsequently. In addition, the mapping relationship between the value of the target weight loss rate and the size specification of the electrode 102 can be set in the programmable logic controller 104. When the size specification of the electrode 102 to be dried in the drying device 101 changes, the programmable logic controller 104 can select a target weight loss rate with a different value based on the different size specifications of the electrode 102.

[0077] In some embodiments, the step of obtaining all actual errors in the previous preset time period including the current moment may include: obtaining the moving speed of the electrode 102 in the drying device 101; obtaining the transmission distance required for the electrode 102 to reach the detection area 113 of the moisture content analyzer 103 after leaving the drying device 101; obtaining the preset time period based on the moving speed and the transmission distance; wherein the moving speed, the transmission distance and the preset time period satisfy the following relationship:

[0078]

[0079] Wherein, T is a preset time period, V is a moving speed of the electrode 102 in the drying device 101 , and S is a transmission distance required for the electrode 102 to reach the detection area 113 of the moisture content analyzer 103 after leaving the drying device 101 .

[0080] It should be noted that, based on the different application scenarios of the method for automatically detecting and adjusting the weight loss rate of the electrode piece, the set movement rate of the electrode piece 102 in the drying device 101 may be different, and the transmission distance required for the electrode piece 102 to reach the detection area 113 of the moisture content analyzer 103 after leaving the drying device 101 may also be different. Therefore, the movement rate V and the transmission distance S in the programmable logic controller 104 are designed to be parameters that can be set and changed by the operator, so that the method for automatically detecting and adjusting the weight loss rate of the electrode piece provided in an embodiment of the present disclosure is applicable to a variety of application scenarios.

[0081] The following is a specific example to illustrate the method for automatically detecting and adjusting the weight loss rate of the pole piece provided by an embodiment of the present disclosure.

[0082] First, the moisture content analyzer 103 performs a measurement operation, detects the moisture content of the electrode 102 online, and sends the moisture content information of the electrode 102 to the programmable logic controller 104 through a signal line. Secondly, the programmable logic controller 104 performs an analysis operation. If it is determined that the actual error at the current moment meets the preset conditions, the programmable logic controller 104 uses a PID algorithm to automatically calculate the adjustment amount based on the acquired moisture content information of the electrode 102, and sends the adjustment amount to the drying device 101 through a signal line. Thirdly, the drying device 101 performs an adjustment operation, and the drying device 101 changes the drying temperature or wind frequency based on the acquired adjustment amount, and adjusts the drying device 101 to the target state according to the adjustment amount. Again, the programmable logic controller 104 obtains feedback and performs closed-loop adjustment. Specifically, based on the movement speed V of the electrode 102 in the drying equipment 101 and the transmission distance S required for the electrode 102 to reach the detection area 113 of the moisture analyzer 103 after leaving the drying equipment 101, the moisture content information of the electrode 102 measured by the moisture analyzer 103 within the preset time period T is obtained, and it is determined again that the actual error at the current moment meets the preset conditions, and the adjustment amount is automatically calculated based on the moisture content information of the electrode 102 obtained within the preset time period T, so as to realize automatic closed-loop adjustment of the weight loss rate of the electrode 102.

[0083] In some embodiments, the method for automatically detecting and adjusting the pole piece weight loss rate includes a manual adjustment mode and an automatic adjustment mode.

[0084] In some cases, if the automatic adjustment mode is adopted, the preset time period T is used as an adjustment cycle, and the programmable logic controller 104 automatically closes the loop to adjust the working parameters of the drying device 101 based on the detection information obtained from the moisture content analyzer 103. For example, in any adjustment cycle, the programmable logic controller 104 determines that the actual error at the current moment meets the preset condition, and then calculates the adjustment amount by itself, and makes the drying device 101 adjust its wind frequency or drying temperature based on the adjustment amount.

[0085] In other cases, if the manual adjustment mode is adopted, the operating parameters of the drying device 101 are manually adjusted by the operator inputting the adjustment amount to the programmable logic controller 104, or the operator manually adjusts the operating parameters of the drying device 101 directly on the drying device 101. For example, the operator adjusts the wind frequency or drying temperature of the drying device 101 by himself.

[0086] In some embodiments, along the moving direction of the pole piece 102, the drying equipment 101 includes a circulating air outlet box located at the front end and a circulating air inlet box located at the rear end; the step of providing a moisture content analyzer 103 may include: along the width direction of the pole piece 102, the detection area 113 of the moisture content analyzer 103 is fixedly set on the area of ​​the pole piece 102 close to the circulating air inlet box.

[0087] It is worth noting that, in the process of drying the pole piece 102 by the drying device 101, most of the wind is blown out by the circulating outlet air box, and blown to the circulating inlet air box at the tail end along the moving direction of the pole piece 102, and further sucked into the circulating inlet air box, and blown out again through the circulating outlet air box after being processed, so as to realize the circulation of the airflow in the drying device 101. In this process, as the pole piece 102 is dried, the airflow flowing from the circulating outlet air box to the circulating inlet air box carries more and more water vapor or small water droplets dried in the pole piece 102, so that the humidity of the airflow near the circulating inlet air box is relatively large, so the moisture content of the pole piece 102 dried here may be higher than the moisture content of the pole piece 102 dried through other areas. If the moisture content of the pole piece 102 near the circulating inlet air box detected by the moisture content analyzer 103 is up to standard, the moisture content of the pole piece 102 located in other areas that is lower than the moisture content of the pole piece 102 here will also be up to standard. In other words, the pole piece 102 dried near the circulating air inlet box can be used as a representative area on the pole piece 102 per unit length to characterize the moisture content of the pole piece 102 per unit length. In this way, there is no need to set up multiple moisture content analyzers 103, nor is there any need to make the moisture content analyzer 103 reciprocate along the width direction of the pole piece 102. It is only necessary to select a representative area on the pole piece 102 as the detection area 113 of the moisture content analyzer 103, which is conducive to simplifying the complexity of the equipment for automatically detecting and adjusting the weight loss rate of the pole piece and reducing the equipment cost.

[0088] In some embodiments, a moisture content analyzer 103 designed based on the ultra-high frequency resonance principle is provided.

[0089] It is worth noting that the moisture content analyzer 103 designed based on the ultra-high frequency resonance principle can not only meet the real-time measurement of the moisture content of the electrode 102, but also has a fast response speed and can instantly feed back the moisture content information of the electrode 102 to the programmable logic controller 104, so that the programmable logic controller 104 can adjust the working parameters of the drying equipment 101 based on the moisture content information of the electrode 102, so as to improve the qualified rate of the electrode 102 produced subsequently.

[0090] In some examples, the detector in the moisture content analyzer 103 is integrated with rare earth metal (such as bismuth) elements with high precision. The detector forms an ultra-high frequency resonance area in the detection area 113 according to the detection instruction issued by the central processor in the moisture content analyzer 103. The central processor detects and analyzes the pole piece 102 passing through the detection area 113 with a set ultra-high frequency resonance coefficient, and a relatively constant ultra-high frequency resonance detection field is formed between the detection area 113 and the pole piece 102 being detected. When a trace amount of water appears in the pole piece 102, the entire relatively constant ultra-high frequency resonance detection field will be slightly disturbed, and the central processor will immediately capture and digitize and analyze the weak water disturbance signal and quickly convert it into an analog signal output. Based on this, it is beneficial to obtain the water content of the pole piece 102 passing through the detection area 113 in a very short time by means of the ultra-high frequency resonance principle.

[0091] In some examples, the detection range of the moisture content analyzer 103 may be 0% to 100%.

[0092] In some examples, the detection rate of the moisture content analyzer 103 can be 9m per second; the single measurement time can be as short as 30ms to 35ms, such as 31.65ms, 32.64ms, 33.55ms or 34.36ms; the detection frequency of the moisture content analyzer 103 can be 0.016GHz to 0.022GHz.

[0093] In some examples, the detection accuracy of the moisture content analyzer 103 can be as high as ±0.01%.

[0094] In some examples, the temperature of the working environment of the moisture content analyzer 103 may be -25°C to 85°C, and the ideal temperature of the working environment may be 5°C to 72°C.

[0095] In some embodiments, the drying equipment 101 may include N ovens connected in sequence along the moving direction of the pole piece 102, and at least part of the working parameters of each oven are independently adjusted; the step of adjusting the working parameters of the drying equipment 101 based on the adjustment amount includes: adjusting the wind frequency of the M ovens closest to the moisture content analyzer 103 based on the adjustment amount, or adjusting the drying temperature of the M ovens closest to the moisture content analyzer 103 based on the adjustment amount; wherein N is greater than M, and N and M are both positive integers.

[0096] It is worth noting that when the programmable logic controller 104 determines that the actual error at the current moment meets the preset conditions, it does not adjust the working parameters of all the ovens in the drying equipment 101, but adopts the concept of back-end precise control to adjust the working parameters of the M ovens closest to the moisture analyzer 103 to ensure that the moisture content of the electrode 102 meets the standard after being dried in the adjusted M ovens.

[0097] In some examples, M can be 4, 5, 6, or 7, etc.

[0098] In some embodiments, the method for automatically detecting and adjusting the weight loss rate of the pole piece may further include the following steps: providing a marking device, the marking device is used to mark the pole piece 102 located in the detection area 113 at the current moment when the programmable logic controller 104 determines that the actual error at the current moment meets the preset conditions. In this way, the pole piece 102 that fails the weight loss rate detection is automatically marked with the help of the marking device, which is conducive to screening defective products in subsequent processes to improve the yield of the battery cell finally produced based on the pole piece 102, and the relevant information of the pole piece 102 with unqualified weight loss rate can be uploaded to the MES system (manufacturing execution system) to facilitate the subsequent traceability of the pole piece 102.

[0099] In some examples, the step of marking the pole piece 102 currently located in the detection area 113 may include: using a spray pen of a marking device to automatically spray a mark on the area of ​​the pole piece 102 .

[0100] In some examples, the sprayed mark may be characters and / or numbers, for example, the sprayed mark may be NG4, wherein NG4 indicates that the fourth pole piece is NG, that is, the weight loss rate of the fourth pole piece does not meet the standard.

[0101] In some cases, along the width direction of the pole piece 102, the pole piece 104 can be divided into 4 sub-pole pieces, each of which subsequently forms a corresponding battery. If the moisture content of any of the 4 sub-pole pieces does not meet the standard, the marking device can mark it. For example, based on the detection area 113 of the moisture content analyzer 103 being fixedly set on the area of ​​the pole piece 102 close to the circulating air inlet box, if the programmable logic controller 104 determines that the actual error at the current moment meets the preset conditions based on the detection information of the moisture content analyzer 103, then the 4 sub-pole pieces corresponding to the current moment are marked with NG1, NG2, NG3 and NG4 respectively.

[0102] In some examples, the material used in the airbrush for spraying may be provided by a cartridge.

[0103] In summary, on the one hand, the actual weight loss rate of the electrode 102 after drying is obtained in real time by means of the moisture content analyzer 103 and the programmable logic controller 104, so as to realize the real-time detection of the actual weight loss rate of the electrode 102, which is not only conducive to improving the production efficiency of the electrode 102, but also conducive to reducing the labor cost of preparing the electrode 102, and also conducive to avoiding the problem that the detection of the electrode 102 is interfered by human beings and the detection accuracy is not high or the electrode is damaged, which is not only conducive to improving the detection accuracy of the weight loss rate of the electrode 102, but also conducive to improving the qualified rate of the electrode 102. On the other hand, on the basis of real-time detection of the actual weight loss rate of the electrode 102, the working parameters of the drying equipment 101 are controlled by means of the programmable logic controller 104 to realize the real-time closed-loop adjustment of the weight loss rate of the electrode 102 after subsequent drying, which is conducive to further improving the qualified rate of the electrode 102, so as to further reduce the production cost of the electrode 102, and without excessive human intervention, it is conducive to reducing the workload of operators. On the other hand, in the step of analyzing and calculating the detection signal to obtain the adjustment amount, the programmable logic controller 104 not only refers to the current error of the pole piece 102 that does not meet the standard at the current moment, but also refers to all actual errors obtained in the previous preset time period including the current moment. This is beneficial to comprehensively consider the drying environment of the pole piece 102 in the preset time period, and is beneficial to improve the accuracy of the obtained adjustment amount, thereby facilitating the precise control of the weight loss rate of the pole piece 102, so as to ensure an extremely high good product qualification rate of the pole piece 102.

[0104] Another embodiment of the present disclosure also provides a device for automatically detecting and adjusting the weight loss rate of the pole piece, which is used to implement the method for automatically detecting and adjusting the weight loss rate of the pole piece provided in the above embodiment. The device for automatically detecting and adjusting the weight loss rate of the pole piece provided in another embodiment of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be noted that the parts that are the same or corresponding to the above embodiment will not be repeated here.

[0105] Combined with reference Figure 2 and Figure 3, the equipment for automatically detecting and adjusting the weight loss rate of the electrode piece includes: a drying device 101, which is configured to dry the electrode piece 102; a moisture content analyzer 103, which is configured to measure in real time the moisture content of the electrode piece 102 after drying after passing through the detection area 113 of the moisture content analyzer 103, along the moving direction of the electrode piece 102, a electrode piece traction part is arranged at the tail end of the drying device 101, and the moisture content analyzer 103 is arranged at the traction part of the electrode piece 102; a programmable logic controller 104 which is respectively connected to the drying device 101 and the moisture content analyzer 103 in communication, is configured to Set it as, based on the moisture content, obtain the actual weight loss rate of the electrode 102 after drying; set the target weight loss rate, and obtain the actual error at the current moment based on the actual weight loss rate and the target weight loss rate; if it is judged that the actual error at the current moment meets the preset conditions, use the actual error at the current moment as the current error; obtain the expected error based on all actual errors obtained in the previous preset time period including the current moment; obtain the adjustment amount based on the current error and the expected error; adjust the working parameters of the drying equipment 101 based on the adjustment amount to adjust the weight loss rate of the electrode 102 after subsequent drying.

[0106] In some embodiments, the device for automatically detecting and adjusting the weight loss rate of the pole piece further comprises an operation screen interface, on which a manual adjustment switch and an automatic adjustment switch are arranged. When the manual adjustment switch is pressed, the device for automatically detecting and adjusting the weight loss rate of the pole piece enters the manual adjustment mode; when the automatic adjustment switch is pressed, the device for automatically detecting and adjusting the weight loss rate of the pole piece enters the automatic adjustment mode.

[0107] In some embodiments, along the moving direction of the pole piece 102, the drying equipment 101 includes a circulating air outlet box located at the front end and a circulating air inlet box located at the rear end, and along the width direction of the pole piece 102, the detection area 113 of the moisture analyzer 103 is located in the area of ​​the pole piece 102 close to the circulating air inlet box.

[0108] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure, so the protection scope of the embodiments of the present disclosure shall be based on the scope defined in the claims.

Claims

1. A method for automatically detecting and adjusting the weight loss rate of a pole piece, characterized in that: include: Provide drying equipment for drying the pole pieces; Providing a moisture content analyzer for real-time measurement of the moisture content of the electrode after drying through the detection area of ​​the moisture content analyzer; A programmable logic controller is provided, which is used to obtain the actual weight loss rate of the electrode piece after drying based on the moisture content, and adjust the working parameters of the drying equipment based on the actual weight loss rate to adjust the weight loss rate of the electrode piece after subsequent drying; Wherein, the step of adjusting the working parameters of the drying equipment based on the actual weight loss rate includes: Setting a target weight loss rate in the programmable logic controller; Acquire an actual error at a current moment based on the actual weight loss rate and the target weight loss rate; If it is determined that the actual error at the current moment meets the preset conditions, the actual error at the current moment is used as the current error; an expected error is obtained based on all the actual errors obtained in the previous preset time period including the current moment; an adjustment amount is obtained based on the current error and the expected error; and the working parameters of the drying equipment are adjusted based on the adjustment amount.

2. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 1, characterized in that: The expected error includes an integral error and a differential error, and the step of obtaining the expected error includes: Performing an integration operation on all the actual errors obtained in the previous preset time period including the current moment to obtain the integrated error; Performing a differential operation on all the actual errors obtained within the preset time period including the current moment to obtain the differential error; The adjustment amount, the current error, the integral error and the differential error satisfy the following relationship: D=(K p *E1)+(K i *E2)+(K d *E3) Wherein, D is the adjustment amount, K p is the first coefficient, K i is the second coefficient, K d is the third coefficient, E1 is the current error, E2 is the integral error, and E3 is the differential error.

3. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 2, characterized in that: Also includes: The first coefficient, and / or the second coefficient, and / or the third coefficient are adjusted according to the material or size of the electrode, the model of the drying equipment, the production environment in which the electrode is located, or the adjusted working parameters of the drying equipment.

4. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 2 or 3, characterized in that: The first coefficient is 0.1 to 3; and / or the second coefficient is 5 to 11; and / or the third coefficient is 0 to 0.

5.

5. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 1 or 2, characterized in that: The step of determining whether the actual error at the current moment satisfies the preset condition comprises: If it is determined that the actual error is greater than the first preset value or less than the second preset value, then the actual error satisfies the preset condition; The first preset value is -0.05% to 0.05%, and the second preset value is -0.2% to -0.1%.

6. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 1 or 2, characterized in that: The step of obtaining all the actual errors within the previous preset time period including the current moment includes: Obtaining the moving speed of the electrode in the drying device; Obtaining the transmission distance required for the electrode to reach the detection area of ​​the moisture content analyzer after leaving the drying equipment; Acquire the preset time period based on the moving speed and the transmission distance; The moving speed, the transmission distance and the preset time period satisfy the following relationship: Among them, T is the preset time period, V is the moving speed of the electrode in the drying equipment, and S is the transmission distance required for the electrode to reach the detection area of ​​the moisture content analyzer after leaving the drying equipment.

7. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 1, characterized in that: Along the moving direction of the pole piece, the drying device includes a circulating air outlet box located at the front end and a circulating air inlet box located at the rear end; The steps of providing the moisture content analyzer include: Along the width direction of the pole piece, the detection area of ​​the moisture content analyzer is fixedly arranged on the area of ​​the pole piece close to the circulating air inlet box; And / or, provide the moisture content analyzer designed based on the ultra-high frequency resonance principle.

8. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 1, characterized in that: The step of adjusting the working parameters of the drying device includes: adjusting the wind frequency of the drying device, or adjusting the drying temperature of the drying device.

9. The method for automatically detecting and adjusting the weight loss rate of a pole piece according to claim 1, characterized in that: The drying device comprises N ovens connected in sequence along the moving direction of the electrode piece, and at least part of the working parameters of each oven are independently adjusted; The step of adjusting the working parameters of the drying equipment based on the adjustment amount includes: adjusting the wind frequency of the M ovens closest to the moisture content analyzer based on the adjustment amount, or adjusting the drying temperature of the M ovens closest to the moisture content analyzer based on the adjustment amount; Wherein, N is greater than M, and both N and M are positive integers.

10. A device for automatically detecting and adjusting the weight loss rate of a pole piece, characterized in that: include: A drying device, configured to dry the electrode piece; A moisture content analyzer is configured to measure in real time the moisture content of the electrode after drying after passing through the detection area of ​​the moisture content analyzer. Along the moving direction of the electrode, a electrode traction position is provided at the tail end of the drying device, and the moisture content analyzer is provided at the electrode traction position; A programmable logic controller is respectively connected to the drying device and the moisture content analyzer, and is configured to obtain the actual weight loss rate of the electrode after drying based on the moisture content; Setting a target weight loss rate, and obtaining an actual error at a current moment based on the actual weight loss rate and the target weight loss rate; If it is determined that the actual error at the current moment meets the preset conditions, the actual error at the current moment is used as the current error; an expected error is obtained based on all the actual errors obtained in the previous preset time period including the current moment; an adjustment amount is obtained based on the current error and the expected error; and the working parameters of the drying equipment are adjusted based on the adjustment amount to adjust the weight loss rate of the electrode after subsequent drying.

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