A battery pole piece coating correction method, a correction device and a coating machine

Abstract

The application relates to a battery pole piece coating deviation correction method, which comprises the following steps: obtaining the real size of a wet film coated according to standard coating parameters, and calculating the wet film deviation value of the real size of the wet film and the preset standard wet film size; obtaining the real size of a dry film after the wet film is dried, and calculating the dry film deviation value of the real size of the dry film and the preset standard dry film size; calculating the dry film deviation average value of a plurality of dry film deviation values; registering a plurality of dry films and a plurality of wet films; calculating the size compensation average value of the plurality of dry films after registration according to the wet film deviation value and the dry film deviation value; calculating the correction amount according to the dry film deviation average value and the size compensation average value, and correcting the standard coating parameters according to the correction amount. The battery pole piece coating deviation correction method provided by the application combines the size compensation average value and the deviation average value as the correction amount for the real-time adjustment of a coating die, so that the waste of materials caused by the lag of the deviation correction operation due to the length of an oven can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery pole piece processing technology, in particular to a battery pole piece coating deviation correction method, a deviation correction device and a coating machine. BACKGROUND

[0002] In the battery processing technology, coating is a necessary link, by uniformly coating the positive and negative electrode plasma on the substrate of the battery, and drying the coated substrate through the oven to form a dry film. Accordingly, according to the active substance in the dry film as the main body of the electrochemical reaction in the battery, the charging and discharging are realized. In the coating process, the width of the positive and negative electrode plasma coverage is an index for measuring the coating quality, and the width that is too wide or too narrow will affect the capacity and safety of the battery.

[0003] However, the wet film formed after coating needs to be dried in the oven, so it is easy to cause the dry film to have certain deformation due to thermal expansion and contraction. In addition, the wet film may be affected by environmental factors such as vibration of the conveying roller or coating equipment, resulting in uneven coating and further deviation, or the surface of the substrate itself is uneven or the thickness is uneven, which may also cause the coating position to deviate. Accordingly, the coating process needs to be corrected according to a standard dry film to ensure that the dry film after drying is consistent with the standard, thereby ensuring the performance and production quality of the battery.

[0004] In the prior art, because the distance of the oven is relatively long, and the wet film is in dynamic change during the baking process, generally, the dry film after drying is detected for misalignment, and compared with the standard dry film to obtain the size difference value, and the difference value is used as the correction amount to adjust the coating die to ensure that the dry film after drying of the wet film is consistent with the standard dry film in the subsequent coating process. However, due to the excessive length of the oven, if misalignment occurs multiple times during production, especially wet film misalignment, the coating die cannot be adjusted in time, and the non-immediate correction can easily cause a lot of waste. SUMMARY

[0005] Based on this, the purpose of the present application is to provide a battery pole piece coating deviation correction method.

[0006] A battery pole piece coating deviation correction method, comprising the following steps:

[0007] S1: obtaining the real size of the wet film coated according to the standard coating parameters, and calculating the wet film misalignment value of the real size of the wet film and the preset standard wet film size n is the total number of samples;

[0008] S2: obtaining the real size of the dry film after the wet film is dried, and calculating the dry film misalignment value of the real size of the dry film and the preset standard dry film size and calculate the dry film misregistration average value E of several dry film misregistration values average ;

[0009] S3: register the several dry films with the several wet films;

[0010] S4: calculate the size compensation average value H of the several dry films after registration according to the wet film misregistration value and the dry film misregistration value ; average ;

[0011] S5: calculate the correction amount according to the dry film misregistration average value E average and the size compensation average value H average , and correct the standard coating parameters according to the correction amount.

[0012] The correction method for the battery pole piece coating provided by the application obtains the size compensation average value and the dry film misregistration average value by real-time acquisition of the real sizes of the wet film and the dry film and combination of calculation, and combines the two to obtain the correction amount, so that the coating die can be adjusted in real time through the correction amount, thereby avoiding the situation that the correction operation lags due to the length of the oven and further causing the waste of production materials. In addition, the size compensation average value is used to reflect the influence of the oven on the wet film, and the dry film misregistration average value is compensated based on the influence, so as to ensure the accurate adjustment of the coating die and effectively improve the coating efficiency.

[0013] Further, the step S3 registers the several dry films with the several wet films in the following manner:

[0014] {(x j ,W j ),(x j +α,D i )},i,j∈n

[0015] {W j＝i ,D i＝j}

[0016] wherein W j＝i is the real size of the jth frame of wet film registered with the ith frame of dry film, W j is the real size of the jth frame of wet film sampled, x j is the coating running distance of the jth frame of wet film sampled, and α is a preset coating running distance; D i＝j is the real size of the ith frame of wet film registered with the jth frame of wet film, D i is the real size of the ith frame of dry film sampled, and n is the total number of samples.

[0017] The present application matches the wet film of the jth frame with the dry film of the ith frame (i.e. i=j) by preset coating running distance, so that the wet film offset value and the dry film offset value are one-to-one corresponding, thereby preventing the continuity and accuracy of the dry film and wet film data from being affected by the production process caused by the transport pause or acceleration, or by the dry film and wet film data sampling out of synchronization or delay caused by random factors, or by the dry and wet film unable to be directly matched, and thereby preventing the error accumulation caused by the subsequent size compensation calculation.

[0018] Further, the correction amount Q satisfies:

[0019] Q=E average +H average

[0020] Wherein, the size compensation mean H average satisfies:

[0021]

[0022] In the formula, is the dry film offset value of the ith frame dry film, is the wet film offset value of the jth frame wet film matched with the ith frame dry film, and n is the total number of samples.

[0023] The present application adds the offset mean and the size compensation mean to obtain the correction amount, thereby effectively improving the stability and precision of the coating process, and ensuring that the wet film width meets the expected requirements.

[0024] In addition, the present application obtains the size compensation value by statistical analysis, which is used to represent the influence of the drying device or oven on the wet film, so that the larger the total number of samples is, the more accurate the correction amount is, thereby improving the quality and yield of the coating process.

[0025] Further, the dry film offset mean E average satisfies:

[0026]

[0027] In the formula, D i represents the actual size of the dry film of the ith frame sample, and D S represents the preset standard dry film size.

[0028] Further, the dry film offset mean E average also satisfies:

[0029]

[0030] In the formula, ReD iRiS represents the real size of the dry film of the reverse side of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, and n1 and n2 are the total number of samples of the front side and the reverse side respectively; and

[0031] the size compensation mean value H average Also satisfied:

[0032]

[0033] In the formula, is the dry film misregistration value of the reverse side of the i-th frame dry film, is the wet film misregistration value of the reverse side of the j-th frame wet film matched with the i-th frame dry film, and n1 and n2 are the total number of samples of the front side and the reverse side respectively.

[0034] The present application introduces the final misregistration mean value and the size compensation mean value with the width data characteristics of the front and reverse sides as the current value, so that the system can update and adjust the coating parameters in real time, thereby significantly reducing the error accumulation in the coating process, improving the production efficiency and quality stability, and further improving the consistency and performance of the product.

[0035] A correction device, comprising a wet film data processing unit, a dry film data processing unit, a dry-wet film registration unit, a size compensation mean value calculation unit and a correction amount calculation unit:

[0036] The wet film data processing unit is used to obtain the real size of the wet film coated according to the standard coating parameters, and calculate the wet film misregistration value of the real size of the wet film and the preset standard wet film size n is the total number of samples;

[0037] The dry film data processing unit is used to obtain the real size of the dry film after the wet film is dried, and calculate the dry film misregistration value of the real size of the dry film and the preset standard dry film size and calculate the dry film misregistration mean value E of a plurality of dry film misregistration values average ;

[0038] The dry-wet film registration unit is used to register a plurality of dry films with a plurality of wet films;

[0039] The size compensation mean value calculation unit is used to calculate the size compensation mean value H of a plurality of dry films after registration according to the wet film misregistration value and the dry film misregistration value ; and average ;

[0040] The correction amount calculation unit is used to calculate the correction amount according to the dry film misregistration mean value E average and the size compensation mean value H average , and correct the standard coating parameters according to the correction amount.

[0041] Further, the dry-wet film registration unit registers the dry films and the wet films in the following manner:

[0042] {(x j ,W j ),(x j +α,D i )},i,j∈n

[0043] {W j＝i ,D i＝j}

[0044] wherein W j＝i is the real size of the jth frame of wet film registered with the ith frame of dry film, W j is the real size of the jth frame of wet film sampled, x j is the coating running distance of the jth frame of wet film sampled, and a is a preset coating running distance; D i＝j is the real size of the ith frame of wet film registered with the jth frame of wet film, D i is the real size of the ith frame of dry film sampled, and n is the total number of samples; and,

[0045] The correction amount Q satisfies:

[0046] Q=E average +H average

[0047] wherein the size compensation mean value H average satisfies:

[0048]

[0049] In the formula, E average is the dry film misregistration value of the ith frame of dry film, E i is the wet film misregistration value of the jth frame of wet film registered with the ith frame of dry film, and n is the total number of samples, and the dry film misregistration mean value E S satisfies:

[0050]

[0051] In the formula, D average represents the real size of the ith frame of dry film sampled, and D i represents a preset standard dry film size.

[0052] Further, the dry film misregistration mean value E average also satisfies:

[0053]

[0054] In the formula, ReD jRiS represents the real size of the dry film of the reverse side of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, and n1 and n2 are the total number of samples of the front side and the reverse side, respectively; and

[0055] The size compensation mean H average Also satisfies:

[0056]

[0057] In the formula, RiS represents the real size of the dry film of the reverse side of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, and n1 and n2 are the total number of samples of the front side and the reverse side, respectively; and RiS represents the real size of the dry film of the reverse side of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, and n1 and n2 are the total number of samples of the front side and the reverse side, respectively; and

[0058] In order to better understand and implement, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 It is a simple structure schematic diagram of a battery pole piece coating machine;

[0060] Figure 2 It is a simple schematic diagram of wet film forming;

[0061] Figure 3 It is a simple schematic diagram of dry film forming;

[0062] Figure 4 It is a simple structure schematic diagram of a battery pole piece coating machine of another embodiment;

[0063] Figure 5 It is a simple structure schematic diagram of a coating die;

[0064] Figure 6 It is a simple structure schematic diagram of the correction device described in the present application;

[0065] Figure 7 It is a simple flowchart schematic diagram of the correction method of the battery pole piece coating described in the present application;

[0066] Figure 8 It is a simple schematic diagram of a baseline setting example of misregistration measurement or calculation;

[0067] Figure 9 It is a simple example schematic diagram of dry-wet film registration. DETAILED DESCRIPTION

[0068] In order to solve the problem of multiple misalignment and offset during the coating process, and the waste of a large amount of material caused by the offset correction process due to the inability to adjust the coating die in time, the present application compensates the current dry film misalignment mean value by sampling the real size of the dry film in a coating distance interval and the registered wet film, and calculating the size compensation mean value, and obtains the correction amount by compensating the current dry film misalignment mean value by the size compensation mean value, adjusts the coating die by the correction amount, and completes the correction. The present application uses the size compensation mean value to represent the influence of the oven on the wet film, and compensates the misalignment mean value by the size compensation mean value to ensure the accuracy of the correction amount, so as to realize the instant and accurate adjustment of the coating die.

[0069] Based on the above design, the present application provides a correction method for battery pole piece coating, and based on the method, a correction device is provided.

[0070] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 , which is a simple structure schematic diagram of a battery pole piece coating machine, Figure 2 , which is a simple schematic diagram of wet film forming, Figure 3 , which is a simple schematic diagram of dry film forming, Figure 4 , which is a simple structure schematic diagram of another embodiment of a battery pole piece coating machine.

[0071] A battery pole piece coating machine comprises a transmission unit 100, a coating die 101 arranged in sequence on the transmission path of the transmission unit, a wet film detection unit, a drying device 105, a dry film detection unit, and the correction device 110 electrically connected and / or communicatively connected with the coating die, the wet film detection unit and the dry film detection unit.

[0072] The transmission unit 100 transmits the battery pole piece to be coated to the next process of battery pole piece processing after passing through the coating die, the wet film detection unit, the drying device and the dry film detection unit in sequence. The transmission unit 100 can be a conveying roller for winding and unwinding the battery pole piece to be coated, i.e. the substrate.

[0073] The coating die 101 coats the battery pole piece to be coated according to the standard coating parameters of the correction device 110, i.e. uniformly applies the plasma coating to the substrate of the battery pole piece through the slit outlet 101A of the coating die, so as to form a wet film on the surface of the battery pole piece. The specific structure of the coating die 101 can be referred to in Figure 5 .

[0074] The wet film detection unit comprises a wet film camera 103 and a reverse wet film camera 104. The wet film camera 103 is arranged on the front surface of the substrate coating surface, and photographs the wet film to detect the width data of the wet film coating. The reverse wet film camera 104 is arranged on the back surface of the substrate coating surface, and also photographs the wet film through the substrate to detect the reverse width data of the wet film coating. The wet film camera can be selected by a charge-coupled device (CCD) visual detection, which is used to sample the actual size of the wet film.

[0075] The drying device 105 can be an oven, which is used to bake the wet film passing through to form a dry film on the surface of the battery pole piece. The oven can be selected according to different film or coating characteristics, production requirements, etc. to obtain the drying degree and curing effect of the dry film coating required by the user, so the selection of the oven is not specifically limited herein.

[0076] The dry film detection unit comprises a dry film camera 106 and a reverse dry film camera 107. The dry film camera 106 is arranged on the front surface of the dry film, and photographs the dry film to detect the width data of the cured coating of the dry film. The reverse dry film camera 107 is arranged on the back surface of the dry film, and also photographs the dry film through the substrate to detect the reverse width data of the cured coating of the dry film. The dry film camera can be a charge-coupled device visual detection, which is used to sample the actual size of the dry film.

[0077] The correction device 110 obtains the width data and the reverse width data of the wet film detection unit and the dry film detection unit, calculates the correction amount through the above data, corrects the standard coating parameters through the correction amount, and sends the corrected coating parameters to the coating die 101.

[0078] Please refer to Figure 6 and Figure 7 , Figure 6 for the simple structure diagram of the correction device of the present application, Figure 7 for the simple flow diagram of the correction method of the battery pole piece coating of the present application.

[0079] The correction device 110 comprises a wet film data processing unit 1, a dry film data processing unit 2, a wet-dry film registration unit 3, a size compensation mean value calculation unit 4, and a correction amount calculation unit 5.

[0080] The wet film data processing unit 1 is used to perform step S1: obtaining the actual size of the wet film coated according to the standard coating parameters, and calculating the wet film misalignment value of the actual size of the wet film and the preset standard wet film size n is the total number of samples.

[0081] Specifically, the wet film data processing unit 1 comprises a wet film data acquisition module 11 and a wet film misregistration calculation module 12.

[0082] The wet film data acquisition module 11 is configured to perform step S11: acquiring the real size of the wet film coated according to the standard coating parameters.

[0083] The standard coating parameters define the relative coordinate position of the coating die, and the standard coating parameters are corrected by distance increments to adjust the position of the coating die, so that the coating die moves accurately according to the distance increments (corrected standard coating parameters).

[0084] The distance increments can be offset or manually input distance data, which is used to adjust the distance of the current coating die movement.

[0085] The wet film misregistration calculation module 12 is configured to perform step S12: calculating the misregistration value of the real size of the wet film and the preset standard wet film size, to obtain the wet film misregistration value

[0086] The wet film misregistration value is calculated as follows:

[0087]

[0088] In the formula, W j is the real size of the wet film of the jth frame sample, W S is the preset standard wet film size, and n is the total number of samples.

[0089] The preset standard wet film size can be set to different standard sizes according to different camera devices, production process requirements, and different substrate raw materials. For example, a baseline is taken as the starting point, and the difference between the detection target and the standard condition on the same baseline is calculated to represent the misregistration value. For specific examples, refer to Figure 8 , Figure 8 The present application does not specifically limit the measurement and calculation of the standard size and the real size.

[0090] Further, the misregistration value of the wet film also includes the misregistration value of the reverse side of the wet film The misregistration value of the reverse side of the wet film is calculated as follows:

[0091]

[0092] In the formula, ReW j is the real size of the reverse side of the wet film of the jth frame sample, ReW S is the preset standard wet film size of the reverse side, and n2 is the total number of samples of the reverse side. ​​

[0093] The calculation of the offset value of the reverse side of the dry film can prevent the limitation of single data source and ensure the stability and effectiveness of the offset value.

[0094] The dry film data processing unit 2 is configured to perform step S2: obtaining the real size of the dry film after the wet film is dried, and calculating the offset value of the dry film between the real size of the dry film and the preset standard dry film size; and calculating the dry film offset average of a plurality of dry film offset values.

[0095] Specifically, the dry film data processing unit 2 comprises a dry film data acquisition module 21, a dry film offset calculation module 22A and a dry film offset average calculation module 22B.

[0096] The dry film data acquisition module 21 is configured to perform step S21: obtaining the real size of the dry film after the wet film is dried.

[0097] Since the wet film needs to be dried for a long conveying distance, and the wet film or dry film may be offset due to mechanical factors during conveying, such as uneven tension of the conveying belt, unstable speed, wear or unevenness, etc.; or thermal factors during drying, such as temperature fluctuation of the oven, uneven temperature distribution, thermal expansion and contraction, etc. leading to offset of the dry film during forming; or environmental factors of the current production, such as humidity change or uneven air flow, etc. leading to the drying speed and drying uniformity of the wet film, causing deviation during the forming of the dry film; accordingly, the real size of the dry film is obtained in real time for subsequent detection of whether the offset occurs.

[0098] The dry film offset calculation module 22A is configured to perform step S22A: calculating the offset value between the real size of the dry film and the preset standard dry film size, to obtain the dry film offset value

[0099] The dry film offset average calculation module 22B is configured to perform step S22B: calculating the dry film offset average of a plurality of dry film offset values. The specific calculation is as follows:

[0100]

[0101] In the formula, D i is the real size of the dry film of the i-th sample, D S is the preset standard dry film size, and n is the total number of samples.

[0102] Accordingly, the dry film offset value can represent whether the current dry film is offset, leading to non-compliance with the production standard. The measurement and calculation of the offset value between the real size of the dry film and the standard dry film size are consistent with the calculation of the offset value of the wet film, and specific examples can be referred to in the description of the wet film offset calculation module 21. Figure 8

[0103] Further, the offset value of the dry film also includes the offset value of the reverse side of the dry film​ its specific The calculation is expressed as:

[0104]

[0105] In the formula, ReD i is the real size of the dry film of the i-th frame sample, ReD S is the preset standard dry film size of the reverse side, and n2 is the total number of reverse side samples.

[0106] The dry film misregistration mean calculation module 22B is configured to perform step S22B: calculating the mean of a plurality of dry film misregistration values to obtain the dry film misregistration mean E average .

[0107] The calculation of E average may be expressed as:

[0108]

[0109] In the formula, D i represents the real size of the dry film of the i-th frame sample, D S represents the preset standard dry film size, and n is the total number of samples.

[0110] The present application calculates a plurality of dry film misregistration values, and uses the dry film misregistration mean as the stable misregistration value of the dry film, so as to ensure that the resetting after misregistration caused by measurement error or individual factors will not affect the calculation of the correction amount.

[0111] Further, the dry film misregistration mean further includes the mean of the reverse side dry film misregistration value, which may be specifically expressed as:

[0112]

[0113] In the formula, ReD i represents the real size of the dry film of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, and n1 and n2 are the total number of samples of the front side and the reverse side, respectively.

[0114] The dry-wet film registration unit 3 is configured to perform step S3: registering a plurality of dry films with a plurality of wet films.

[0115] Specifically, the plurality of dry films and the plurality of wet films are registered in the following manner:

[0116] {(x j ,W i ),(x j +α,D i )}, i, j ∈ n

[0117] Thus:

[0118] {W j＝i ,D i＝j}

[0119] Among them, W j＝i is the actual size of the jth wet film aligned with the ith dry film, W j is the actual size of the wet film sampled at the jth frame, x j is the coating running distance of the wet film sampled in the jth frame, α is the preset coating running distance; D i＝j is the actual size of the i-th frame wet film registered with the j-th frame wet film, D i is the actual size of the dry film sampled in the i-th frame, and n is the total number of samples.

[0120] The preset coating running distance varies depending on the production equipment, production process, production specifications, oven scale, camera setting position or coating machine parameters. For specific examples, please refer to Figure 9 , which represents a schematic diagram of alignment through a preset coating running distance. Therefore, the present invention does not specifically limit its preset coating running distance.

[0121] During the coating process, the transmission unit may pause, freeze, or experience acceleration changes during the substrate conveying process due to mechanical failure, external factors, human intervention, material problems, voltage instability, or control system factors between substrate unwinding and rewinding. Although the certain duplication of width data obtained by camera (CCD) visual inspection has little actual impact on the calculation of the mean misalignment value, it is easy to cause inaccurate registration data (i.e., i≠j) in the compensation calculation process, especially the tracking or registration of the wet film using the camera time frame, which ultimately leads to inaccurate calculation of the size compensation mean.

[0122] Accordingly, the wet film of the jth frame is aligned and matched with the dry film of the ith frame (making i=j) through the preset coating running distance, so that the wet film misalignment value and the dry film misalignment value correspond one-to-one, thereby preventing the conveying pause or acceleration caused by the production process from affecting the continuity and accuracy of the dry film and wet film data; or preventing the dry and wet films from being directly matched due to asynchronous data sampling of the dry and wet films or delays caused by random factors; thereby affecting the error accumulation caused by the subsequent size compensation calculation.

[0123] The size compensation mean value calculation unit 4 is used to perform step S4: according to the wet film misalignment value Displacement value with dry film Calculate the size compensation mean H of several dry films after registration average .

[0124] Its H average The calculation can be expressed as:

[0125]

[0126] In the formula, is the dry film misregistration value of the i-th frame of dry film, is the wet film misregistration value of the j-th frame of wet film registered with the i-th frame of dry film, and n is the total number of samples.

[0127] The wet film misregistration value of the j-th frame of wet film registered with the i-th frame of dry film can ensure that the error accumulation of the size compensation average value is not caused by environmental factors or sampling delay when calculating the difference.

[0128] The present application calculates the difference average value between the misregistration value of the dry film and the misregistration value of the wet film registered with the dry film, which is used to characterize the influence of the oven on the coating film, and prevents the influence of individual abnormal conditions on the result, thereby ensuring the stability of the size compensation average value. In addition, the user can set the total number of samples according to the needs, and the greater the value of the total number of samples, the higher the stability of the size compensation average value, and the better the reflection of the influence of the oven on the wet film.

[0129] Further, the size compensation average value further includes the dry film and the wet film on the opposite side registered for compensation average value calculation, which can be specifically represented as:

[0130]

[0131] In the formula, is the dry film misregistration value of the i-th frame of dry film, is the wet film misregistration value of the j-th frame of wet film registered with the i-th frame of dry film, and n1 and n2 are the total number of samples of the front and back, respectively.

[0132] Accordingly, by combining the misregistration data on the opposite side for compensation, the effectiveness and accuracy of the size compensation average value are further improved.

[0133] The correction amount calculation unit 5 is used to perform step S5: calculating the correction amount according to the dry film misregistration average value and the size compensation average value, and correcting the standard coating parameters according to the correction amount.

[0134] Specifically, the correction amount Q is calculated as:

[0135] Q=E average +H average

[0136] Then, the current standard coating parameters are corrected according to the correction amount, so that the coating die is corrected, and the wet film width meets the expected requirements.

[0137] In addition, by respectively setting the front dry and wet film cameras and the back wet film camera according to different distances, for example,Figure 4 The distance between the front dry film camera and the front wet film camera is greater or smaller than the distance between the back dry film camera and the back wet film camera, so that when the width data of the back is involved in the mean value calculation, the data result is more effective and stable compared with setting the front and back cameras at the same distance when calculating the size compensation mean value or the misalignment mean value.

[0138] Compared with the prior art, the real size of the wet film and the dry film is obtained in real time, and the size compensation mean value and the dry film misalignment mean value are obtained by calculation, and the dry film misalignment mean value is combined with the size compensation mean value to obtain the correction amount, and the coating die is adjusted in real time through the correction amount, so that the correction operation lag caused by the length of the oven is avoided, and the waste of production materials caused by the lag is avoided. In addition, the size compensation mean value is used to reflect the influence of the oven on the wet film, and the misalignment of the dry film is compensated based on the influence, so as to ensure the accurate adjustment of the coating die and effectively improve the efficiency of coating.

[0139] Further, the real size of the back dry film and the real size of the back wet film can be further combined to compensate for the dry film misalignment mean value and the size compensation mean value, so as to improve the overall stability of the coating process and the consistency of the product quality.

[0140] Based on the same inventive concept, the present application also provides an electronic device, which can be a server, a desktop computing device or a mobile computing device (for example, a laptop computer, a handheld computing device, a tablet computer, a netbook, etc.) and the like terminal device. The device includes one or more processors and a memory, wherein the processor is used to execute a program to realize the battery pole piece coating correction method of the embodiment of the present application; the memory is used to store the computer program executable by the processor.

[0141] Based on the same inventive concept, the present application also provides a computer readable storage medium, which corresponds to the above-mentioned embodiments of the battery pole piece coating correction method, and the computer readable storage medium has a computer program stored thereon, and the program is executed by the processor to realize the steps of the battery pole piece coating correction method described in any of the above-mentioned embodiments.

[0142] The application can take the form of a computer program product accessible from a storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code for use by or in connection with a computer. Computer-usable storage media include permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0143] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but cannot be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and the present application also intends to include these modifications and improvements.

Claims

1. A method for correcting the deviation of a battery electrode coating, characterized in that: The following steps are involved: S1: Obtain the actual size of the wet film coated according to the standard coating parameters, and calculate the wet film misalignment value between the actual size of the wet film and the preset standard wet film size j∈n, n is the total number of samples; S2: Obtain the actual size of the dry film after the wet film is dried, and calculate the offset value E between the actual size of the dry film and the preset standard dry film size. Di , i∈n; and calculate the mean dry film misalignment E of several dry film misalignment values average ; S3: registering a number of dry films with a number of wet films; S4: According to the wet film misalignment value E Wj Displacement value E with dry film Di , calculate the size compensation mean H of several dry films after registration average ; S5: According to the mean value of dry film misalignment E average and size compensation mean H average The deviation correction amount is calculated, and the standard coating parameters are corrected according to the deviation correction amount.

2. The correction method according to claim 1, characterized in that: The step S3 aligns the dry films with the wet films in the following manner: {(x j ,W j ),(x j +α,D i )},i,j∈n {W j＝i ,D i＝j } Among them, W j＝i is the actual size of the jth wet film aligned with the ith dry film, W j is the actual size of the wet film sampled at the jth frame, x j is the coating running distance of the wet film sampled in the jth frame, α is the preset coating running distance; D i＝j is the actual size of the i-th frame wet film registered with the j-th frame wet film, D i is the actual size of the dry film sampled in the i-th frame, and n is the total number of samples.

3. The correction method according to claim 1 or 2, characterized in that: The deviation correction amount Q satisfies: Q=E average +H average Among them, the size compensation mean H average satisfy: Where, is the dry film misalignment value of the i-th frame dry film, is the wet film misalignment value of the jth wet film frame registered with the ith dry film frame, and n is the total number of samples.

4. The correction method according to claim 3, characterized in that: The dry film misalignment mean E average satisfy: Where D i The actual size of the dry film sampled at the i-th frame, D S Indicates preset standard dry film sizes.

5. The correction method according to claim 4, characterized in that: The dry film misalignment mean E average Also meets: Where ReD i represents the actual size of the dry film on the reverse side of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, n1 and n2 are the total number of samples on the front side and the reverse side respectively; and The size compensation mean H average Also meets: Where, is the dry film misalignment value on the reverse side of the i-th frame dry film, is the wet film misalignment value of the back side of the jth wet film aligned with the ith dry film, n1 and n2 are the total number of samples on the front and back sides, respectively.

6. A deviation correction device, characterized in that: It includes wet film data processing unit, dry film data processing unit, dry and wet film registration unit, size compensation mean value calculation unit and correction amount calculation unit: The wet film data processing unit is used to obtain the real size of the wet film coated according to the standard coating parameters and calculate the wet film misalignment value between the real size of the wet film and the preset standard wet film size. j∈n, n is the total number of samples; The dry film data processing unit is used to obtain the real size of the dry film after the wet film is dried, and calculate the dry film misalignment value between the real size of the dry film and the preset standard dry film size. i∈n; and calculate the mean dry film dislocation E of several dry film dislocation values average ; The dry and wet film registration unit is used to register a plurality of dry films with a plurality of wet films; The size compensation mean value calculation unit is used to calculate the size compensation mean value according to the wet film misalignment value. Displacement value with dry film Calculate the size compensation mean H of several dry films after registration average ; The deviation correction amount calculation unit is used to calculate the deviation correction amount according to the dry film misalignment mean E average and size compensation mean H average The deviation correction amount is calculated, and the standard coating parameters are corrected according to the deviation correction amount.

7. The deviation-correcting device according to claim 6, characterized in that: The dry-wet film registration unit registers a plurality of dry films with a plurality of wet films in the following manner: {(x j ,W j ),(x j +α,D i )},i,j∈n {W j＝i ,D i＝j } Among them, W j＝i is the actual size of the jth wet film aligned with the ith dry film, w j is the actual size of the wet film sampled at the jth frame, x j is the coating running distance of the wet film sampled in the jth frame, α is the preset coating running distance; D i＝j is the actual size of the i-th frame wet film registered with the j-th frame wet film, D i is the actual size of the dry film sampled in the i-th frame, n is the total number of samples; and The deviation correction amount Q satisfies: Q=E average +H average Among them, the size compensation mean H average satisfy: Where, is the dry film misalignment value of the i-th frame dry film, is the wet film misalignment value of the jth wet film aligned with the ith dry film, n is the total number of samples, and the dry film misalignment mean E average satisfy: Where D i The actual size of the dry film sampled at the i-th frame, D S Indicates preset standard dry film sizes.

8. The deviation-correcting device according to claim 7, characterized in that: The dry film misalignment mean E average Also meets: Where ReD i represents the actual size of the dry film on the reverse side of the i-th frame sample, ReS represents the preset standard dry film size of the reverse side, n1 and n2 are the total number of samples on the front side and the reverse side respectively; and The size compensation mean H average Also meets: Where, is the dry film misalignment value on the reverse side of the i-th frame dry film, is the wet film misalignment value of the back side of the jth wet film aligned with the ith dry film, n1 and n2 are the total number of samples on the front and back sides, respectively.

9. A coating machine comprising: A transmission unit, a coating die head, a wet film detection unit, an oven, and a dry film detection unit sequentially arranged on a transmission path of the transmission unit, characterized in that it further comprises a correction device according to any one of claims 6 to 8 electrically and / or communicatively connected to the coating die head, the wet film detection unit, and the dry film detection unit; The transmission unit transmits the battery electrode to be coated to the next process of battery electrode processing after passing through the coating die head, wet film detection unit, drying device, and dry film detection unit in sequence; The coating die head coats the battery pole piece to be coated according to the standard coating parameters of the correction device, that is, the plasma coating is evenly applied to the substrate of the battery pole piece to form a wet film on the surface of the battery pole piece; A wet film camera is located between the coating die head and the drying oven, and is used to detect the width data of the wet film coating and transmit the width data to the correction device according to any one of claims 6 to 8; The oven bakes the wet film that has been transported, so that a dry film is formed on the surface of the battery electrode; The dry film detection unit includes a dry film camera; the dry film camera is arranged on the front of the dry film, takes pictures of the dry film, detects the width data of the cured coating on the dry film, and transmits the width data to the correction device according to any one of claims 6-8.

10. The coating machine according to claim 9, characterized in that The wet film detection unit further includes a reverse wet film camera; the reverse wet film camera is arranged on the reverse side of the coated surface of the substrate, and also takes a picture of the wet film through the substrate to detect the reverse width data of the wet film coating, and uses the reverse width data as the correction device according to any one of claims 6 to 8; The dry film detection unit also includes a back dry film camera; the back dry film camera is arranged on the back of the dry film, and it also takes a picture of the dry film through the substrate, detects the back width data of the cured coating of the dry film, and transmits its back width data to the correction device according to any one of claims 6-8.

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