CN116213203A

CN116213203A - Double-sided coating method and device, electronic equipment and storage medium

Info

Publication number: CN116213203A
Application number: CN202310507442.4A
Authority: CN
Inventors: 胡呈红; 肖健武
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-05-08
Filing date: 2023-05-08
Publication date: 2023-06-06
Anticipated expiration: 2043-05-08
Also published as: CN116213203B

Abstract

The application provides a double-sided coating method, a device, an electronic device and a storage medium, wherein the double-sided coating method comprises the following steps: determining, for each coating of the pole piece, a deviation between an actual coating flow of the coating and a target coating flow of the coating; the actual coating flow rate of the coating is adjusted according to the deviation between the actual coating flow rate of the coating and the target coating flow rate of the coating. According to the double-sided coating method, the actual coating flow of each coating of the pole piece is subjected to closed-loop adjustment according to the deviation between the actual coating flow of the coating and the target coating flow of the coating, so that the deviation between the actual coating flow of each coating and the target coating flow of the coating meets the preset requirement, and the double-sided coating effect is effectively improved.

Description

Double-sided coating method and device, electronic equipment and storage medium

Technical Field

The application relates to the technical field of batteries, in particular to a double-sided coating method, a double-sided coating device, electronic equipment and a storage medium.

Background

The coating process is a process of coating one or more layers of liquid on a substrate, and the coated liquid is dried or cured to form a film layer with a special function. In the manufacturing process of the lithium ion battery, the coating process is used for uniformly coating the anode slurry and the cathode slurry of the battery on a base material, and the coating process is also a key process in the manufacturing process of the battery, and the coating quality is closely related to the capacity, the service life, the safety and the like of the battery.

The current double-sided coating process adjusts the coating flow through the dry film surface density in the following specific modes: the coating surface density standard value is preset, and when the actual coating surface density deviates from the coating surface density standard value, the actual coating surface density is regulated by regulating the pump speed of the slurry conveying device.

However, the above-described method of adjusting the coating flow rate by the dry film surface density has a hysteresis, resulting in poor coating effect.

Disclosure of Invention

An object of the embodiments of the present application is to provide a double-sided coating method, a device, an electronic apparatus, and a storage medium, which can solve the problem of poor coating effect caused by hysteresis in a manner of adjusting a coating flow rate by a dry film surface density.

In a first aspect, embodiments of the present application provide a double-sided coating method, the method including: determining, for each coating of the pole piece, a deviation between an actual coating flow of the coating and a target coating flow of the coating; and adjusting the actual coating flow of the coating according to the deviation between the actual coating flow of the coating and the target coating flow of the coating.

In the technical scheme of the embodiment of the application, the actual coating flow of each coating of the pole piece is closed-loop regulated according to the deviation between the actual coating flow of the coating and the target coating flow of the coating, so that the deviation between the actual coating flow of each coating and the target coating flow of the coating meets the preset requirement, and the double-sided coating effect is effectively improved.

In one implementation manner of the first aspect, the determining, for each coating layer of the pole piece, a deviation between an actual coating flow rate of the coating layer and a target coating flow rate of the coating layer includes: and determining deviation between the actual coating flow and the target coating flow of the coating aiming at the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating of the pole piece.

According to the technical scheme, according to the deviation between the actual coating flow of the coating and the target coating flow of the coating, the actual coating flow of the coating of the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating of the pole piece is controlled in a closed loop mode, and the double-sided coating effect is effectively improved; meanwhile, the coating uniformity of the pole piece is improved and the double-sided coating effect is further improved by respectively carrying out closed loop control on the first side wet film upper coating and the first side wet film lower coating and the second side wet film upper coating and the second side wet film lower coating which are respectively coated on the first side and the second side of the substrate.

In an implementation manner of the first aspect, the above two-sided coating method further includes: determining deviation between the actual dry film weight and the target dry film weight for the first dry film and the second dry film of the pole piece; and adjusting the coating target coating flow according to the deviation between the actual dry film weight and the target dry film weight.

In the technical scheme of this application embodiment, this scheme carries out closed loop control according to the deviation between dry film actual weight and the dry film target weight to the dry film actual weight of first face dry film and second face dry film of pole piece respectively, cooperatees with the flow closed loop, has realized the flow closed loop of two-sided coating and the double closed loop control of weight closed loop, has effectively improved two-sided coating effect.

In an implementation manner of the first aspect, the adjusting the actual coating flow according to a deviation between the actual coating flow and the target coating flow includes: if the deviation between the actual coating flow of the coating and the target coating flow of the coating meets a first preset threshold requirement, calculating a pump speed regulating quantity according to the deviation between the actual coating flow of the coating and the target coating flow of the coating and the double-sided coating head piece pump speed; and adjusting the actual coating flow of the coating by adopting the pump speed adjusting quantity.

In the technical scheme of the embodiment of the application, the deviation between the actual coating flow of the coating and the target coating flow of the coating meets the first preset threshold requirement, and the pump speed adjusting quantity is calculated by adopting the first pump speed of the double-sided coating, so that the actual coating flow of the coating is adjusted by adopting the pump speed adjusting quantity, the closed-loop adjustment of the flow of the double-sided coating is realized, and the double-sided coating effect is effectively improved.

In one implementation manner of the first aspect, the adjusting the actual coating flow of the coating using the pump speed adjustment amount includes: and if the pump speed regulating quantity meets the second preset threshold value requirement, adopting a first preset proportionality coefficient and the pump speed regulating quantity to carry out proportionality regulation on the actual coating flow of the coating.

In the technical scheme of the embodiment of the application, when the pump speed adjustment quantity meets the second preset threshold requirement, the first preset proportion coefficient and the pump speed adjustment quantity are adopted to carry out proportion adjustment on the actual coating flow of the coating, so that the actual coating flow of the coating can quickly reach the preset threshold requirement, the defect of poor coating effect caused by adjustment lag is avoided, and the double-sided coating effect is effectively improved.

In one implementation manner of the first aspect, the adjusting the target coating flow according to the deviation between the actual dry film weight and the target dry film weight includes: the deviation between the actual weights of the films and the target weight of the dry film meets a third preset threshold requirement, and then the first target flow adjustment amounts of the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating are calculated respectively according to the coating target coating flow, the pump speed adjustment amount, the actual weight of the dry film and the deviation between the actual weight of the dry film and the target weight of the dry film; and adjusting the target coating flow of the coating by adopting the first target flow adjustment amount.

In the technical scheme of the embodiment of the application, when the deviation between the actual dry film weight and the target dry film weight meets the preset threshold requirement, the first target flow regulating quantity is calculated according to the coating target coating flow, the pump speed regulating quantity, the actual dry film weight and the deviation between the actual dry film weight and the target dry film weight, the actual dry film weight is regulated by regulating the coating target coating flow, and the double-sided coating effect is effectively improved by combining the weight closed-loop control and the flow closed-loop control.

In one implementation manner of the first aspect, after the adjusting the coating target coating flow using the first target flow adjustment amount, the method further includes: waiting for a first preset time, and re-acquiring the actual weight of the dry film; calculating a second target flow adjustment amount according to the re-acquired dry film actual weight and the deviation between the re-acquired dry film actual weight and the dry film target weight; if the deviation between the second target flow rate adjustment amount and the first target flow rate adjustment amount does not meet a fourth preset threshold requirement, the value of the second target flow rate adjustment amount is given to the first target flow rate adjustment amount; adjusting the coating target coating flow by adopting the first target flow adjustment quantity; and repeating the steps until the deviation between the second target flow regulating quantity and the first target flow regulating quantity meets the fourth preset threshold requirement.

According to the technical scheme, the fool-proof function is added for weight closed-loop control, after the first target flow adjustment quantity is adopted to adjust the coating target coating flow, the second target flow adjustment quantity is adopted to adjust the first target flow adjustment quantity, so that on one hand, the situation that the weight closed-loop control effect is poor or even fails due to the fact that the first target flow value is smaller is avoided, and the double-sided coating effect is effectively improved; on the other hand, the problem of uneven coating weight due to a larger value of the first target flow rate is avoided, and the double-sided coating effect is further improved.

In one implementation manner of the first aspect, the adjusting the coating target coating flow using the first target flow adjustment amount includes: and adopting the first target flow and a second preset proportionality coefficient to carry out proportionality adjustment on the coating target coating flow.

In the technical scheme of the embodiment of the application, the second preset proportion coefficient and the first target flow are adopted to carry out proportion adjustment on the coating target coating flow, so that the coating target coating flow can quickly reach the preset threshold requirement, the defect of poor coating effect caused by adjustment lag is avoided, and the double-sided coating effect is effectively improved.

In one implementation manner of the first aspect, the method further includes: aiming at the first surface wet film and the second surface wet film of the pole piece, if the difference value of the ratio between the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film meets a fifth preset threshold requirement, calculating a third target flow regulating quantity according to the ratio between the target coating flow of the coating, the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film; and adjusting the coating target coating flow by adopting the third target flow adjustment amount.

In the technical scheme of the embodiment of the application, the flow closed-loop control is adopted to increase the proportional deviation fool-proofing function, when the difference value of the ratio between the actual coating flow of the upper coating of the wet film and the actual coating flow of the lower coating of the wet film and the ratio between the target coating flow of the upper coating of the wet film and the target coating flow of the lower coating of the wet film meets the fifth preset threshold requirement, the coating target coating flows of the upper coating and the lower coating are respectively regulated, and the double-sided coating effect is effectively improved.

In a second aspect, embodiments of the present application provide a double-sided coating apparatus, the apparatus comprising:

and the flow regulating module is used for regulating the actual coating flow of each coating of the pole piece according to the deviation between the actual coating flow of the coating and the target coating flow of the coating.

In a third aspect, embodiments of the present application provide an electronic device comprising a processor and a memory storing computer readable instructions that, when executed by the processor, perform the steps of the method as provided in the first aspect above.

In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method as provided in the first aspect above.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a two-sided coating system according to some embodiments of the present application;

FIG. 2 is a schematic illustration of a structure of a pole piece with a double-sided coating according to some embodiments of the present application;

fig. 3 is a schematic structural diagram of an electronic device according to some embodiments of the present application;

fig. 4 is a schematic flow chart of a double-sided coating method according to some embodiments of the present application;

FIG. 5 is a flow chart of another two-sided coating method provided in some embodiments of the present application;

FIG. 6 is a schematic flow chart of an embodiment of the present application when the actual coating flow rate of a coating is adjusted according to the deviation between the actual coating flow rate of the coating and the target coating flow rate of the coating;

FIG. 7 is a schematic diagram of a specific flow chart when the coating target coating flow is adjusted according to the deviation between the actual dry film weight and the target dry film weight according to some embodiments of the present application;

FIG. 8 is a schematic diagram of a flow chart for obtaining a first target flow adjustment according to some embodiments of the present disclosure;

FIG. 9 is a flow chart of another two-sided coating method provided in some embodiments of the present application;

fig. 10 is a schematic structural diagram of a double-sided coating apparatus according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

100-double-sided coating system, 110-unreeling mechanism, 120-slurry coating mechanism, 130-slurry drying mechanism and 140-reeling mechanism; 200-pole piece, 210-substrate, 220-first side upper coating, 230-first side lower coating, 240-second side upper coating, 250-second side lower coating; 300-electronic device, 310-processor, 320-communication interface, 330-memory, 340-communication bus; 500-double-sided coating device, 510-flow regulating module, 520-weight regulating module.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the double-sided coating process of the battery manufacturing process, a double-sided coating layer is coated on the substrate 210 by the double-sided coating system 100 to obtain a double-coated pole piece. Referring to fig. 1, fig. 1 is a schematic structural diagram of a double-sided coating system 100 according to some embodiments of the present application, where the double-sided coating system 100 includes an unreeling mechanism 110, a slurry coating mechanism 120, a slurry drying mechanism 130, and a reeling mechanism 140, a substrate 210 is input into the slurry coating mechanism 120 through the unreeling mechanism 110, the slurry coating mechanism 120 inputs a substrate coated with the slurry into the slurry drying mechanism 130 after coating the slurry on the substrate, and the slurry drying mechanism 130 inputs the slurry coated on the substrate 210 into the reeling mechanism 140 after drying the slurry. It should be understood that the double-sided coating system 100 is only one possible implementation of double-sided coating in the double-sided coating process, and the specific structure of the double-sided coating system 100 is not limited in the embodiments of the present application.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a pole piece 200 with a double-sided coating according to some embodiments of the present application, wherein the pole piece 200 includes a substrate 210, a first on-side coating 220 and a first under-side coating 230 coated on a first side of the substrate, and a second on-side coating 240 and a second under-side coating 250 coated on a second side of the substrate. It will be appreciated that the first topcoat 220, the first undercoating 230, the second topcoat 240, and the second undercoating 250 described above may be wet film coatings or dry film coatings. In addition, it should be noted that fig. 2 shows only an example of one double-coated pole piece of the multi-coated pole pieces.

In the current double-sided coating process, the surface density of the dry film obtained after being dried by the slurry drying mechanism 130 is used for adjusting the coating flow rate of the slurry coating mechanism 120 when the wet film is coated, in the practical application process, a certain distance exists between the slurry coating mechanism 120 and the slurry drying mechanism 130, if the surface density of the dry film after being dried is used for adjusting the coating flow rate of the slurry coating mechanism 120 when the wet film is coated, a certain hysteresis exists, and the coating effect of the pole piece is poor due to the hysteresis of the adjustment of the coating flow rate, and the dry film weight has a high probability of not meeting the coating weight requirement.

The surface density of the dry film after drying has a certain relation with the coating flow of the slurry coating mechanism 120, if the coating flow of the slurry coating mechanism 120 is controlled, the problem that the coating flow is regulated by adopting the surface density of the dry film with a certain hysteresis can be relieved, and the uniformity of the dry film weight can be further controlled by controlling the coating flow.

Based on the above conception, the application provides a double-sided coating method, which respectively performs closed-loop control on the actual coating flow of each coating of the pole piece according to the actual coating flow of the coating and the target coating flow of the coating, solves the problem that the coating flow is regulated by adopting the dry film surface density to have certain hysteresis, and improves the double-sided coating effect.

The double-sided coating method disclosed by the embodiment of the application can be applied to a coating procedure of multi-coating on the two sides of the pole piece in the battery manufacturing process.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an electronic device according to some embodiments of the present application. An embodiment of the present application provides an electronic device 300, which may include: at least one processor 310, such as a CPU, at least one communication interface 320, at least one memory 330, and at least one communication bus 340. Wherein the communication bus 340 is used to enable direct connection communication of these components. The communication interface 320 of the device in the embodiment of the present application is used for performing signaling or data communication with other node devices. Memory 330 may be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. Memory 330 may also optionally be at least one storage device located remotely from the aforementioned processor. The memory 330 has stored therein computer readable instructions which, when executed by the processor 310, perform the method process shown in fig. 4 described below.

Referring to fig. 4, fig. 4 is a flow chart of a double-sided coating method according to some embodiments of the present application. The embodiment of the application provides a double-sided coating method, which comprises the following steps:

Step S410: determining, for each coating of the pole piece, a deviation between an actual coating flow of the coating and a target coating flow of the coating; adjusting the actual coating flow of the coating according to the deviation between the actual coating flow of the coating and the target coating flow of the coating;

the actual coating flow of each of the above-described coatings can be determined by measuring the slurry discharge amount of the coating die in the slurry coating mechanism 120. The slurry discharge amount of the coating die may be obtained by a flow meter provided in the slurry coating mechanism 120.

It will be appreciated that the electronic device performing the above-described double-sided coating method may acquire the actual coating flow rate of each coating layer in real time through the flow meter provided in the slurry coating mechanism 120, so as to adjust the actual coating flow rate of each coating layer in real time, respectively. The actual coating flow rate of each coating layer may also be obtained at regular time by a flow meter provided in the slurry coating mechanism 120, so that the actual coating flow rate of each coating layer is adjusted at regular time, respectively.

It should be noted that the coating target coating flow may be determined by the first piece parameters. It will be appreciated that prior to the actual production of the two-sided coating system 100 described above, a first inspection is required, which is typically performed on the first or first few products produced by the two-sided coating system 100, and subsequent processing may continue after the products are inspected. The coating target coating flow rate of each coating may be determined from the coating average coating flow rate of the corresponding coating of one of the good products in the head-piece inspection, or from the coating average coating flow rates of the corresponding coating of a plurality of good products in the head-piece inspection. Of course, the target coating flow rate of the coating can also be set directly and manually.

In addition, it should be noted that, according to the deviation between the actual coating flow rate of the coating and the target coating flow rate of the coating, adjusting the actual coating flow rate of the coating may be understood as a closed loop control process of the actual coating flow rate of the coating, and when the deviation between the actual coating flow rate of the coating and the target coating flow rate of the coating is greater than a certain deviation threshold, the actual coating flow rate of the coating is adjusted so that the deviation between the actual coating flow rate of the coating and the target coating flow rate of the coating meets the preset threshold requirement.

In the implementation process of the scheme, the actual coating flow of each coating of the pole piece is subjected to closed-loop adjustment according to the deviation between the actual coating flow of the coating and the target coating flow of the coating, so that the deviation between the actual coating flow of each coating and the target coating flow of the coating meets the preset requirement, and the double-sided coating effect is effectively improved.

According to some embodiments of the present application, step S410 determines, for each coating of the pole piece, a deviation between an actual coating flow of the coating and a target coating flow of the coating, comprising:

and determining deviation between the actual coating flow and the target coating flow of the coating aiming at the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating of the pole piece.

The structures of the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating are shown in fig. 2, the first surface wet film upper coating and the first surface wet film lower coating are coated on the first surface of the substrate, and the second surface wet film upper coating and the second surface wet film lower coating are coated on the second surface of the wet film.

It is understood that the deviation between the actual coating flow of the coating and the target coating flow of the coating is determined for the first side wet film upper coating, the first side wet film lower coating, the second side wet film upper coating and the second side wet film lower coating of the pole piece; adjusting the actual coating flow of the coating according to the deviation between the actual coating flow of the coating and the target coating flow of the coating comprises:

according to the deviation between the actual coating flow of the coating on the first surface wet film and the target coating flow of the coating on the first surface wet film, the actual coating flow of the coating on the first surface wet film is regulated;

according to the deviation between the actual coating flow of the first wet under-film coating and the target coating flow of the first wet under-film coating, the actual coating flow of the first wet under-film coating is regulated;

according to the deviation between the actual coating flow of the coating on the second surface wet film and the target coating flow of the coating on the second surface wet film, the actual coating flow of the coating on the second surface wet film is regulated;

And adjusting the actual coating flow of the second surface wet film under coating according to the deviation between the actual coating flow of the second surface wet film under coating and the target coating flow of the second surface wet film under coating.

The above-described first-side wet film upper coating actual coating flow rate, first-side wet film lower coating actual coating flow rate, second-side wet film upper coating actual coating flow rate, and second-side wet film lower coating actual coating flow rate can be determined by measuring the slurry discharge amount of the coating die in the slurry coating mechanism 120. The slurry discharge amount of the coating die may be obtained by a flow meter provided in the slurry coating mechanism 120.

It is understood that the electronic device performing the above-mentioned two-sided coating method may obtain the first wet film upper coating actual coating flow rate, the first wet film lower coating actual coating flow rate, the second wet film upper coating actual coating flow rate, and the second wet film lower coating actual coating flow rate in real time through the flow meter provided in the slurry coating mechanism 120, so as to adjust the first wet film upper coating actual coating flow rate, the first wet film lower coating actual coating flow rate, the second wet film upper coating actual coating flow rate, and the second wet film lower coating actual coating flow rate in real time, respectively. The first wet film upper coating actual coating flow rate, the first wet film lower coating actual coating flow rate, the second wet film upper coating actual coating flow rate, and the second wet film lower coating actual coating flow rate can also be obtained at regular time by the flow meter provided in the slurry coating mechanism 120, so that the first wet film upper coating actual coating flow rate, the first wet film lower coating actual coating flow rate, the second wet film upper coating actual coating flow rate, and the second wet film lower coating actual coating flow rate are respectively adjusted at regular time.

In the implementation process of the scheme, according to the deviation between the actual coating flow of the coating and the target coating flow of the coating, the actual coating flow of the coating of the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating of the pole piece are respectively controlled in a closed loop manner, so that the double-sided coating effect is effectively improved; meanwhile, the coating uniformity of the pole piece is improved and the double-sided coating effect is further improved by respectively carrying out closed loop control on the first side wet film upper coating and the first side wet film lower coating and the second side wet film upper coating and the second side wet film lower coating which are respectively coated on the first side and the second side of the substrate.

According to some embodiments of the present application, referring to fig. 5, the above-mentioned double-sided coating method may further include:

step S420: determining deviation between the actual weight of the dry film and the target weight of the dry film according to the dry films of the first surface and the second surface of the pole piece; the coating target coating flow is adjusted according to the deviation between the actual dry film weight and the target dry film weight.

The structures of the first dry film and the second dry film in step S420 are shown in fig. 2, wherein the first dry film includes a first upper dry film coating and a first lower dry film coating, the second dry film includes a second upper dry film coating and a second lower dry film coating, and the first dry film and the second dry film are respectively coated on the first side and the second side of the substrate 210.

It is understood that step S420 includes:

adjusting the coating target coating flow on the first surface wet film and the coating target coating flow under the first surface wet film according to the deviation between the actual weight of the first surface dry film and the target weight of the first surface dry film;

and adjusting the coating target coating flow on the second surface wet film and the coating target coating flow under the second surface wet film according to the deviation between the actual weight of the second surface dry film and the target weight of the second surface dry film.

The first dry film actual weight and the second dry film actual weight can be obtained by measuring the first dry film surface density and the second dry film surface density of the pole piece dried by the slurry drying mechanism 130. The first dry film surface density multiplied by the first dry film area is the actual weight of the first dry film. Similarly, the second side dry film weight can be obtained from the second side dry film surface density and the second side dry film area. Dry film areal density can be obtained by an areal density meter disposed in the slurry drying mechanism 130.

The actual weight of the first dry film and the actual weight of the second dry film may also be directly obtained by a beta-ray weight measuring device disposed in the slurry drying mechanism 130.

Of course, the actual dry film weight of the first surface and the actual dry film weight of the second surface may also be obtained by sampling, for example, punching and sampling are performed on the surface of the dry film, the sample is weighed, and then the actual dry film weight may be obtained according to the ratio of the punched area to the dry film area.

It can be understood that the electronic device executing the double-sided coating method can acquire the actual weight of the first side dry film and the actual weight of the second side dry film in real time, so as to respectively adjust the target coating flow rate of the first side wet film, the target coating flow rate of the second side wet film, and the target coating flow rate of the second side wet film according to the deviation between the actual weight of the first side dry film and the target weight of the first side dry film and the deviation between the actual weight of the second side dry film and the target weight of the second side dry film. The first side dry film actual weight and the second side dry film actual weight can be obtained at regular time, so that the first side wet film upper coating target coating flow and the first side wet film lower coating target coating flow and the second side wet film upper coating target coating flow and the second side wet film lower coating target coating flow are respectively adjusted at regular time according to the deviation between the first side dry film actual weight and the first side dry film target weight and the deviation between the second side dry film actual weight and the second side dry film target weight.

It should be noted that the dry film target weight described above may be determined by the first piece parameters. The dry film target weight for each dry film may be determined from the dry film weight of the corresponding dry film of one acceptable product in the head piece inspection, or from the average dry film weight of the corresponding dry films of the plurality of acceptable products in the head piece inspection. Of course, the dry film target weight may also be set directly manually.

In addition, it should be noted that, according to the deviation between the actual dry film weight and the target dry film weight, adjusting the coating target coating flow rate can be understood as a closed-loop control process for the actual dry film weight, and when the deviation between the actual dry film weight and the target dry film weight is greater than a certain deviation threshold, the coating actual coating flow rate is adjusted, so that the deviation between the actual dry film weight and the target dry film weight meets the preset threshold requirement.

In the implementation process of the scheme, according to the deviation between the actual weight of the dry film and the target weight of the dry film, the actual weights of the dry films of the first surface dry film and the second surface dry film of the pole piece are respectively subjected to closed-loop control, and are matched with the flow closed loop, so that the double closed-loop control of the flow closed loop and the weight closed loop of double-sided coating is realized, and the double-sided coating effect is effectively improved.

According to some embodiments of the present application, referring to fig. 6, the step S410 adjusts the actual coating flow according to the deviation between the actual coating flow and the target coating flow, including:

step S411: if the deviation between the actual coating flow of the coating and the target coating flow of the coating meets the first preset threshold requirement, calculating the pump speed regulating quantity according to the deviation between the actual coating flow of the coating and the target coating flow of the coating and the double-sided coating first piece pump speed;

step S412: and adjusting the actual coating flow of the coating by adopting the pump speed adjusting quantity.

It will be appreciated that the slurry coating mechanism 120 may adjust the discharge flow rate of each die separately by a plurality of screw pumps, and thus the actual coating flow rate of the coating may be adjusted by adjusting the pump speed of the screw pumps.

The double-sided coating head pump speed is the pump speed of the screw pump obtained when the head test is performed on the double-sided coating system 100, and the double-sided coating head pump speed may be determined by the average pump speed of each screw pump corresponding to one qualified product in the head test, or may be determined by the average pump speed of each screw pump corresponding to a plurality of qualified products in the head test.

Optionally, according to the deviation between the actual coating flow of the coating and the target coating flow of the coating and the pump speed of the double-sided coating head piece, the method for calculating the pump speed adjustment amount can be as follows:

optionally, referring to fig. 6, the step S410 adjusts the actual coating flow according to the deviation between the actual coating flow and the target coating flow, and further includes:

step S413: if the deviation between the actual coating flow of the coating and the target coating flow of the coating does not meet the first preset threshold requirement, the original pump speed of the screw pump is maintained.

In the implementation process of the scheme, the deviation between the actual coating flow of the coating and the target coating flow of the coating meets the first preset threshold requirement, and the pump speed adjusting quantity is calculated by adopting the first pump speed of the double-sided coating, so that the actual coating flow of the coating is adjusted by adopting the pump speed adjusting quantity, the closed-loop adjustment of the flow of the double-sided coating is realized, and the double-sided coating effect is effectively improved.

According to some embodiments of the present application, referring to fig. 6, step S412 adjusts the actual coating flow of the coating using the pump speed adjustment amount, including:

step S4121: and if the pump speed regulating quantity meets the second preset threshold requirement, adopting the first preset proportionality coefficient and the pump speed regulating quantity to carry out proportionality regulation on the actual coating flow of the coating.

The step S4121 of scaling the actual coating flow of the coating by using the first preset scaling factor and the pump speed adjustment amount may be understood as determining a new pump speed adjustment amount superimposed with the first preset scaling factor by using the product of the first preset scaling factor and the pump speed adjustment amount, and then scaling the actual coating flow of the coating by using the pump speed adjustment amount superimposed with the first preset scaling factor.

Step S412 adjusts the actual coating flow of the coating by using the pump speed adjustment amount, and further includes:

step S4122: if the pump speed adjustment quantity meets the sixth preset threshold requirement, adjusting the actual coating flow of the coating by adopting the preset pump speed adjustment quantity;

step S4123: and if the pump speed adjustment quantity meets the seventh preset threshold value requirement, giving an alarm and prompting that manual adjustment is needed.

In the implementation process of the scheme, when the pump speed adjustment quantity meets the second preset threshold requirement, the first preset proportion coefficient and the pump speed adjustment quantity are adopted to carry out proportion adjustment on the actual coating flow of the coating, so that the actual coating flow of the coating can quickly reach the preset threshold requirement, the defect of poor coating effect caused by adjustment lag is avoided, and the double-sided coating effect is effectively improved.

According to some embodiments of the present application, referring to fig. 7, the step S420 adjusts the target coating flow according to the deviation between the actual dry film weight and the target dry film weight, including:

step S421: the deviation between the actual weight of the films and the target weight of the dry film meets the third preset threshold requirement, and then the first target flow regulating amounts of the first wet film upper coating, the first wet film lower coating, the second wet film upper coating and the second wet film lower coating are respectively calculated according to the coating target coating flow, the pump speed regulating amount, the actual weight of the dry film and the deviation between the actual weight of the dry film and the target weight of the dry film;

step S422: and adjusting the target coating flow of the coating by adopting the first target flow adjustment.

Optionally, referring to fig. 8, in step S421, according to the coating target coating flow, the pump speed adjustment amount, the actual dry film weight, and the deviation between the actual dry film weight and the target dry film weight, the method for calculating the first target flow adjustment amounts of the first wet film upper coating and the first wet film lower coating or the second wet film upper coating and the second wet film lower coating respectively includes:

step S4211: obtaining the pump speed adjustment amount of the upper coating layer or the lower coating layer of the first surface wet film calculated in the step S411, and recording the pump speed adjustment amount of the upper coating layer as

The lower coating pump speed regulating quantity is marked as +.>

；

Step S4212: if it is

And->

In step S412, the actual flow rate of the lower coating layer is adjusted by the pump speed adjustment amount alone, and the first target flow rate adjustment amount of the lower coating layer is calculated>

；

Wherein,,

coating flow for the original lower coating target;

The actual dry film weight of the first dry film;

A dry film target weight for the first side dry film;

Is the weight of the substrate;

The representation will->

Value of +.>

；

Step S4213: if it is

And->

In step S412, the actual flow rate of the coating layer is adjusted by the pump speed adjustment amount alone, and the first target flow rate adjustment amount of the coating layer is calculated>

；

Wherein,,

coating flow for the original coating target;

The representation will->

Value of +.>

；

Step S4124: if it is

And->

Or->

And->

I.e. step S412 of simultaneously applying the upper and lower coatingsThe actual coating flow of the coating is adjusted or the actual coating flow of the coating on the upper coating and the lower coating is not adjusted at the same time, the first target flow adjustment amount of the upper coating is calculated respectively +>

And a first target flow regulation amount of the under-coating layer +.>

；

It is understood that the above-mentioned steps S4211 to S4124 only describe the calculation method of the coating target coating flow rate of the first side wet film upper coating layer and the first side wet film lower coating layer, and the calculation method of the coating target coating flow rate of the second side wet film upper coating layer and the second side wet film lower coating layer is consistent with the above-mentioned steps S4211 to S4124, and the embodiments of the present application will not be repeated.

Optionally, referring to fig. 7, the step S420 adjusts the target coating flow according to the deviation between the actual dry film weight and the target dry film weight, and further includes:

step S423: the deviation between the actual weights of the films and the target weight of the dry film meets the eighth preset threshold requirement, and the target coating flow of the original coating is not regulated;

step S424: and (3) alarming if the deviation between the actual weight of the films and the target weight of the dry film meets the ninth preset threshold value requirement, prompting that the manual adjustment is needed, and re-executing the steps S421 to S424, wherein if the continuous preset times are followed, the whole machine is stopped after alarming each time.

Alternatively, after step S422 or step S424 is performed, a second preset time may be waited for and then steps S421 to S424 are re-performed, wherein the preset time may be calculated according to the coating speed of the double-sided coating system 100 and the distance between the slurry coating mechanism 120 and the slurry drying mechanism 130.

In the implementation process of the scheme, the deviation between the actual weight of the films and the target weight of the dry films meets the preset threshold requirement, the first target flow regulating quantity is calculated according to the coating target coating flow, the pump speed regulating quantity, the actual weight of the dry films and the deviation between the actual weight of the dry films and the target weight of the dry films, the actual weight of the dry films is regulated by regulating the coating target coating flow, and the double-sided coating effect is effectively improved by combining the weight closed-loop control and the flow closed-loop control.

According to some embodiments of the present application, referring to fig. 8, after adjusting the coating target coating flow using the first target flow adjustment amount in step S422, the method further includes:

step S423: executing a weight closed loop fool-proofing step;

the step S423 includes:

step S4231: waiting for a first preset time, and re-acquiring the actual weight of the dry film;

step S4232: calculating a second target flow adjustment amount according to the re-acquired actual dry film weight and the deviation between the re-acquired actual dry film weight and the target dry film weight;

step S4233: if the deviation between the second target flow rate adjustment amount and the first target flow rate adjustment amount does not meet the fourth preset threshold requirement, the value of the second target flow rate adjustment amount is given to the first target flow rate adjustment amount, and then step S422 is returned;

and repeating the steps until the deviation between the second target flow regulating quantity and the first target flow regulating quantity meets the fourth preset threshold requirement.

The method for calculating the second target flow rate adjustment amount for the first preset time, for example, 15 seconds, is the same as the method for calculating the first target flow rate adjustment amount, and will not be described herein.

In the implementation process of the scheme, a fool-proof function is added for weight closed-loop control, after the first target flow regulating quantity is adopted to regulate the coating target coating flow, the second target flow regulating quantity is adopted to regulate the first target flow regulating quantity, so that on one hand, the situation that the weight closed-loop control effect is poor or even fails due to the fact that the first target flow value is smaller is avoided, and the double-sided coating effect is effectively improved; on the other hand, the problem of uneven coating weight due to a larger value of the first target flow rate is avoided, and the double-sided coating effect is further improved.

According to some embodiments of the present application, step S422 adjusts the coating target coating flow using the first target flow adjustment amount, including: and adopting the first target flow and the second preset proportionality coefficient to carry out proportionality adjustment on the target coating flow of the coating.

It will be appreciated that when the first target flow rate and the second preset scaling factor are used to scale the target coating flow rate of the coating, the first target flow rate adjustment amount of the lower coating

The calculation method of (1) is as follows:

first target flow rate adjustment of the upper coating

The calculation method of (1) is that

First target flow rate adjustment of the upper coating

The calculation method of (1) is as follows:

first target flow rate adjustment of coating

The calculation method of (1) is as follows:

wherein,,

the second predetermined scaling factor may also be referred to as a closed-loop scaling factor by weight.

In the implementation process of the scheme, the second preset proportion coefficient and the first target flow are adopted to carry out proportion adjustment on the coating target coating flow, so that the coating target coating flow can quickly reach the preset threshold requirement, the defect of poor coating effect caused by adjustment lag is avoided, and the double-sided coating effect is effectively improved.

According to some embodiments of the present application, referring to fig. 9, the above-mentioned double-sided coating method further includes:

Step S430: aiming at the first surface wet film and the second surface wet film of the pole piece, if the difference value of the ratio between the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film meets a fifth preset threshold requirement, calculating a third target flow regulating quantity according to the ratio between the target coating flow of the coating, the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film; and adjusting the coating target coating flow by adopting the third target flow adjustment amount.

The above step S430 may be understood as that the deviation of the actual coating flow of the upper and lower coating layers in the closed flow loop is foolproof, and when the difference between the ratio between the actual coating flow of the upper coating layer on the wet film and the actual coating flow of the lower coating layer on the wet film and the ratio between the target coating flow of the upper coating layer on the wet film and the target coating flow of the lower coating layer on the wet film meets the fifth preset threshold requirement, it is proved that the deviation of the actual coating flow of the upper coating layer on the wet film and the actual coating flow of the lower coating layer on the wet film is larger, and at this time, the target coating flow of the upper and lower coating layers needs to be adjusted.

The calculation method of the third target flow adjustment amount comprises the following steps:

wherein,,

a third target flow adjustment for the topcoat;

A third target flow adjustment for the undercoating;

Coating flow for the under-coating target;

Coating a flow rate for the overcoated target;

The actual coating flow for the topcoat;

The flow is actually applied for the under coat.

In the implementation process of the scheme, the proportion deviation fool-proof function is added for flow closed-loop control, and when the difference value of the ratio between the actual coating flow of the upper coating of the wet film and the actual coating flow of the lower coating of the wet film and the ratio between the target coating flow of the upper coating of the wet film and the target coating flow of the lower coating of the wet film meets the fifth preset threshold requirement, the coating target coating flows of the upper coating and the lower coating are respectively regulated, so that the double-sided coating effect is effectively improved.

Fig. 10 shows a schematic block diagram of a double-sided coating apparatus 500 provided herein, the apparatus comprising:

the flow adjustment module 510 is configured to adjust, for each coating layer of the pole piece, the actual coating flow of the coating layer according to a deviation between the actual coating flow of the coating layer and the target coating flow of the coating layer.

According to some embodiments of the present application, optionally, the flow adjustment module 510 is specifically configured to: determining deviation between actual coating flow and target coating flow of the coating aiming at the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating of the pole piece; and adjusting the actual coating flow of the coating according to the deviation between the actual coating flow of the coating and the target coating flow of the coating, and adjusting the actual coating flow of the coating.

Optionally, according to some embodiments of the present application, the flow adjustment module 510 includes:

the first wet film coating actual coating flow regulating unit is used for regulating the first wet film coating actual coating flow according to the deviation between the first wet film coating actual coating flow and the first wet film coating target coating flow;

the first wet under-film coating actual coating flow regulating unit is used for regulating the first wet under-film coating actual coating flow according to the deviation between the first wet under-film coating actual coating flow and the first wet under-film coating target coating flow;

the second-side wet film coating actual coating flow regulating unit is used for regulating the second-side wet film coating actual coating flow according to the deviation between the second-side wet film coating actual coating flow and the second-side wet film coating target coating flow;

and the second-side wet film under-coating actual coating flow regulating unit is used for regulating the second-side wet film under-coating actual coating flow according to the deviation between the second-side wet film under-coating actual coating flow and the second-side wet film under-coating target coating flow.

Optionally, referring to fig. 10, according to some embodiments of the present application, the double-sided coating apparatus 500 further includes:

The weight adjusting module 520 is configured to adjust the coating target coating flow according to the deviation between the actual dry film weight and the target dry film weight for the first dry film and the second dry film of the pole piece.

Optionally, according to some embodiments of the present application, the weight adjustment module 520 includes:

the first surface dry film weight adjusting unit is used for adjusting the coating target coating flow on the first surface wet film and the coating target coating flow under the first surface wet film according to the deviation between the actual weight of the first surface dry film and the target weight of the first surface dry film;

and the second surface dry film weight adjusting unit is used for adjusting the coating target coating flow on the second surface wet film and the coating target coating flow under the second surface wet film according to the deviation between the actual weight of the second surface dry film and the target weight of the second surface dry film.

Optionally, according to some embodiments of the present application, the flow adjustment module 510 is specifically configured to:

when the deviation between the actual coating flow of the coating and the target coating flow of the coating meets the first preset threshold requirement, calculating the pump speed regulating quantity according to the deviation between the actual coating flow of the coating and the target coating flow of the coating and the double-sided coating head piece pump speed; and adjusting the actual coating flow of the coating by adopting the pump speed adjusting quantity.

Optionally, according to some embodiments of the present application, the flow adjustment module 510 further includes:

and the first proportion adjusting unit is used for adopting a first preset proportion coefficient and the pump speed adjusting quantity to carry out proportion adjustment on the actual coating flow of the coating when the pump speed adjusting quantity meets the second preset threshold value requirement.

Optionally, according to some embodiments of the present application, the weight adjustment module 520 is specifically configured to:

when the deviation between the actual dry film weight and the target dry film weight meets a third preset threshold requirement, respectively calculating first target flow adjustment amounts of the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating according to the coating target coating flow, the pump speed adjustment amount, the actual dry film weight and the deviation between the actual dry film weight and the target dry film weight; and adjusting the target coating flow of the coating by adopting the first target flow adjustment amount.

Optionally, according to some embodiments of the present application, the weight adjustment module 520 further comprises:

the weight closed-loop fool-proofing unit is used for waiting for a first preset time after the weight adjusting module adjusts the coating target coating flow by adopting the first target flow adjusting quantity, and re-acquiring the actual weight of the dry film; calculating a second target flow adjustment amount according to the re-acquired dry film actual weight and the deviation between the re-acquired dry film actual weight and the dry film target weight; if the deviation between the second target flow rate adjustment amount and the first target flow rate adjustment amount does not meet a fourth preset threshold requirement, the value of the second target flow rate adjustment amount is given to the first target flow rate adjustment amount; adjusting the coating target coating flow by adopting the first target flow adjustment quantity; and repeating the steps until the deviation between the second target flow regulating quantity and the first target flow regulating quantity meets the fourth preset threshold requirement.

and the second proportion adjusting unit is used for adopting the first target flow and a second preset proportion coefficient to carry out proportion adjustment on the coating target coating flow.

Optionally, according to some embodiments of the present application, the double-sided coating apparatus 500 further comprises:

the flow closed loop fool-proofing module is used for aiming at the first surface wet film and the second surface wet film of the pole piece, if the difference value of the ratio between the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film meets a fifth preset threshold requirement, calculating a third target flow regulating quantity according to the ratio between the target coating flow of the coating, the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film; adjusting the coating target coating flow rate by adopting the third target flow rate adjustment amount

The present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs a method in any of the foregoing alternative implementations.

The storage medium may be implemented by any type of volatile or nonvolatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM), electrically erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), erasable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.

Embodiments of the present application also provide a computer program product which, when run on a computer, causes the computer to perform the method in any of the alternative implementations.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

Further, the units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Furthermore, functional modules in various embodiments of the present application may be integrated together to form a single portion, or each module may exist alone, or two or more modules may be integrated to form a single portion.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A double-sided coating method, characterized in that the method comprises:

determining, for each coating of the pole piece, a deviation between an actual coating flow of the coating and a target coating flow of the coating;

and adjusting the actual coating flow of the coating according to the deviation between the actual coating flow of the coating and the target coating flow of the coating.

2. The double-sided coating method according to claim 1, wherein determining a deviation between an actual coating flow rate of the coating and a target coating flow rate of the coating for each coating of the pole piece comprises:

3. The double-sided coating method of claim 2, further comprising:

determining deviation between the actual dry film weight and the target dry film weight for the first dry film and the second dry film of the pole piece;

and adjusting the coating target coating flow according to the deviation between the actual dry film weight and the target dry film weight.

4. A double-sided coating method according to claim 3, wherein the adjusting the coating actual coating flow according to the deviation between the coating actual coating flow and the coating target coating flow comprises:

if the deviation between the actual coating flow of the coating and the target coating flow of the coating meets a first preset threshold requirement, calculating a pump speed regulating quantity according to the deviation between the actual coating flow of the coating and the target coating flow of the coating and the double-sided coating head piece pump speed;

and adjusting the actual coating flow of the coating by adopting the pump speed adjusting quantity.

5. The double-sided coating method according to claim 4, wherein the adjusting the actual coating flow rate of the coating using the pump speed adjustment amount comprises:

and if the pump speed regulating quantity meets the second preset threshold value requirement, adopting a first preset proportionality coefficient and the pump speed regulating quantity to carry out proportionality regulation on the actual coating flow of the coating.

6. The double-sided coating method according to claim 4, wherein the adjusting the coating target coating flow according to the deviation between the dry film actual weight and the dry film target weight comprises:

The deviation between the actual weights of the films and the target weight of the dry film meets a third preset threshold requirement, and then the first target flow adjustment amounts of the first surface wet film upper coating, the first surface wet film lower coating, the second surface wet film upper coating and the second surface wet film lower coating are calculated respectively according to the coating target coating flow, the pump speed adjustment amount, the actual weight of the dry film and the deviation between the actual weight of the dry film and the target weight of the dry film;

and adjusting the target coating flow of the coating by adopting the first target flow adjustment amount.

7. The double-sided coating method according to claim 6, characterized in that, after the adjustment of the coating target coating flow rate using the first target flow rate adjustment amount, the method further comprises:

waiting for a first preset time, and re-acquiring the actual weight of the dry film;

calculating a second target flow adjustment amount according to the re-acquired dry film actual weight and the deviation between the re-acquired dry film actual weight and the dry film target weight;

if the deviation between the second target flow rate adjustment amount and the first target flow rate adjustment amount does not meet a fourth preset threshold requirement, the value of the second target flow rate adjustment amount is given to the first target flow rate adjustment amount;

Adjusting the coating target coating flow by adopting the first target flow adjustment quantity;

8. The double-sided coating method according to claim 6 or 7, characterized in that the adjusting the coating target coating flow rate using the first target flow rate adjustment amount includes:

and adopting the first target flow and a second preset proportionality coefficient to carry out proportionality adjustment on the coating target coating flow.

9. The double-sided coating method according to any one of claims 1 to 7, characterized in that the method further comprises:

aiming at the first surface wet film and the second surface wet film of the pole piece, if the difference value of the ratio between the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film meets a fifth preset threshold requirement, calculating a third target flow regulating quantity according to the ratio between the target coating flow of the coating, the actual coating flow of the coating on the wet film and the actual coating flow of the coating below the wet film and the ratio between the target coating flow of the coating on the wet film and the target coating flow of the coating below the wet film;

And adjusting the coating target coating flow by adopting the third target flow adjustment amount.

10. A double-sided coating apparatus, characterized in that the apparatus comprises:

11. An electronic device, comprising: a processor and a memory storing computer readable instructions which, when executed by the processor, perform the steps of the method according to any one of claims 1 to 9.

12. A computer readable storage medium storing computer instructions which, when executed by a computer, cause the computer to perform the method of any one of claims 1-9.