Pole piece density detection method, system and equipment, storage medium and program product

Abstract

The invention relates to the technical field of batteries, and discloses a pole piece density detection method, system and device, a storage medium and a program product, the method comprises the following steps: obtaining original physical parameters of a pole piece sample, the original physical parameters being physical quantities representing inherent intrinsic properties of the pole piece sample after the influence of an open space on the surface of the pole piece sample is excluded; obtaining apparent physical parameters of the pole piece sample, wherein the apparent physical parameters are physical parameters of the pole piece sample subjected to sealing treatment; the apparent physical parameters comprise the apparent density of the pole piece sample; the sealing treatment is to form a sealing layer on the surface of the pole piece sample so as to seal the open space; and determining the density of the pole piece sample based on the original physical parameters and the apparent physical parameters. The open space on the surface of the pole piece sample can be effectively isolated, so that the real apparent physical parameters of the pole piece sample are obtained, the actual density of the pole piece sample is accurately calculated in combination with the original physical parameters, and the quality of the pole piece is reliably evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a compactness detection method, system, device, storage medium and program product of an electrode sheet. BACKGROUND

[0002] The electrode sheet is a core functional component of a battery, and directly determines the energy density, power characteristics, cycle life and safety of the battery. The compactness is a core index for measuring the compactness of the electrode sheet, and the compactness of the electrode sheet has an important influence on the performance of the battery. Too high or too low compactness has an adverse effect on the performance of the battery. Therefore, before the electrode sheet is used to manufacture a battery, the compactness of the electrode sheet needs to be detected.

[0003] In the related art, the density of the electrode sheet is usually determined by using the Archimedes drainage method, geometric density calculation and the like, and the compactness of the electrode sheet is qualitatively analyzed based on the density. However, the actual compactness of the electrode sheet cannot be accurately represented based on the density of the electrode sheet, and therefore there is a lack of a scheme capable of directly and accurately quantitatively calculating the compactness of the electrode sheet of the battery in the related art.

[0004] The part provided in this part is merely background information related to the present application, and it is not necessarily prior art. SUMMARY

[0005] In view of the above problems, the present application provides a compactness detection method, system, device, storage medium and program product of an electrode sheet. The electrode sheet sample is subjected to sealing treatment, which can effectively isolate the open space on the surface of the electrode sheet sample, so as to realize the measurement and calculation of the apparent physical parameters of the electrode sheet sample, and realize the quantitative analysis of the compactness of the electrode sheet in combination with the original physical parameters of the electrode sheet sample.

[0006] The first aspect of the present application provides a compactness detection method of an electrode sheet, comprising: obtaining original physical parameters of an electrode sheet sample, the original physical parameters being physical quantities representing the intrinsic properties of the electrode sheet sample after excluding the influence of the open space on the surface of the electrode sheet sample; obtaining apparent physical parameters of the electrode sheet sample, the apparent physical parameters being physical parameters of the electrode sheet sample after sealing treatment; the apparent physical parameters include apparent density of the electrode sheet sample; the sealing treatment is to form a sealing layer on the surface of the electrode sheet sample to close the open space on the surface of the electrode sheet sample; determining the compactness of the electrode sheet sample based on the original physical parameters and the apparent physical parameters.

[0007] By sealing the surface of the pole piece sample, the open space on the surface of the pole piece sample is effectively isolated from the external space, so that the subsequent apparent physical parameters obtained are consistent with the true apparent properties of the pole piece sample. Further, in combination with the original physical parameters of the pole piece sample, the actual density of the pole piece sample can be accurately calculated, the quantitative analysis of the pole piece density is realized, and the accuracy of the calculated density is improved, so that the quality of the pole piece can be reliably evaluated.

[0008] In some embodiments of the present application, the apparent physical parameters of the pole piece sample are obtained by: obtaining the target volume of the pole piece sample after sealing treatment; obtaining the target weight of the pole piece sample after sealing treatment; determining the apparent physical parameters of the pole piece sample based on the original physical parameters, the target volume and the target weight.

[0009] Since the surface of the pole piece sample is sealed, the open space on the surface of the pole piece sample is isolated from the external space, so that in the process of detecting the target volume of the sealed pole piece sample, the volume of the open space on the surface of the pole piece sample will not affect the measurement of the target volume. The detected target volume includes the apparent volume of the pole piece sample and the volume of the sealing layer on the surface of the pole piece sample after sealing, thereby helping to accurately obtain the apparent physical parameters of the pole piece sample, improving the accuracy of the apparent physical parameters, and further improving the accuracy of the final obtained density of the pole piece sample.

[0010] In some embodiments of the present application, the apparent physical parameters of the pole piece sample are determined based on the original physical parameters, the target volume and the target weight, including: calculating the difference between the target weight and the original weight of the pole piece sample included in the original physical parameters to obtain the weight of the sealing layer on the surface of the pole piece sample after sealing treatment; obtaining the volume of the sealing layer based on the weight of the sealing layer and the preset density of the preset substance constituting the sealing layer; calculating the difference between the target volume and the volume of the sealing layer to obtain the apparent volume of the pole piece sample; obtaining the apparent density of the pole piece sample based on the original weight of the pole piece sample and the apparent volume.

[0011] By precisely measuring the target volume and target weight of the pole piece sample with a sealing layer, the apparent density of the pole piece sample is accurately calculated, the quantitative analysis of the apparent density of the pole piece sample is realized, and the subsequent quantitative analysis of the density of the pole piece sample is realized.

[0012] In some embodiments of the present application, the determining the compactness of the pole piece sample based on the original physical parameters and the apparent physical parameters comprises: obtaining an original density of the pole piece sample based on the original weight and the original volume of the pole piece sample included in the original physical parameters; calculating the compactness of the pole piece sample based on the original density and an apparent density of the pole piece sample included in the apparent physical parameters.

[0013] By precisely measuring the original volume and the apparent volume of the pole piece sample, the deviation of the compactness caused by the simplification of the assumed particle packing model or the volume measurement error in the traditional estimation method is reduced, so that the finally calculated compactness is closer to the real material state of the pole piece sample, the quantitative analysis of the compactness of the pole piece is realized, and high precision of the determined compactness can be obtained.

[0014] In some embodiments of the present application, after the determining the compactness of the pole piece sample, the method further comprises: performing quality detection on the pole piece sample based on the compactness to obtain a quality detection result; in a case where the quality detection result indicates that the pole piece sample has a compactness defect, sending feedback information to a pole piece production system, so that the pole piece production system adjusts pole piece production parameters based on the feedback information.

[0015] In the above manner, the quality of the pole piece produced by the pole piece production system is detected based on the compactness of the pole piece sample, and in a case where the pole piece sample has a compactness defect, feedback information is provided to the pole piece production system, so that the pole piece production system can accurately adjust the pole piece production parameters, thereby improving the production quality of the pole piece and the consistency of the compactness of the produced pole piece, and further improving the product yield of the subsequent battery manufacturing process, reducing the battery performance failure or safety hazard caused by the flow of substandard products into the market due to the compactness defect, and reducing the quality cost.

[0016] A second aspect of the present application provides a pole piece compactness detection system, comprising a compactness detection device and a sealing device; The sealing device is configured to form a sealing layer on the surface of the pole piece sample, the sealing layer covering the open space on the surface of the pole piece sample and isolating the open space from the external environment; The density detection device is configured to execute the compactness detection method of the first aspect.

[0017] The sealing device forms a sealing layer on the surface of the electrode sheet sample, which can effectively isolate the open space on the surface of the electrode sheet sample, so that the subsequent apparent physical parameters obtained are consistent with the true apparent properties of the electrode sheet sample. In combination with the original physical parameters of the electrode sheet sample, the actual density of the electrode sheet sample can be accurately calculated, the quantitative analysis of the electrode sheet density is realized, and the accuracy of the calculated density is improved, so that the quality of the electrode sheet can be reliably evaluated.

[0018] In some embodiments of the present application, the sealing device is used to coat the surface of the electrode sheet sample with a liquid preset substance; and the temperature is adjusted to make the liquid preset substance on the surface of the electrode sheet sample cool and solidify to form the sealing layer.

[0019] Since the size of the open space such as pores, cracks and depressions on the surface of the electrode sheet sample is very small, usually in microns or even nanometers. The molecules of the preset substance are relatively large and difficult to fill into the open space. Therefore, the sealing layer formed only covers the open space and isolates the open space from the external environment. Therefore, when the volume of the electrode sheet sample with the sealing layer is detected, the gas cannot enter the open space on the surface of the electrode sheet sample through the sealing layer, which helps to accurately detect the true apparent volume of the electrode sheet sample, and further improves the accuracy of the final obtained density of the electrode sheet sample.

[0020] In some embodiments of the present application, the density detection system further comprises an electrode sheet production system, a conveying device and a punching device. The density detection device is further configured to send an electrode sheet sampling instruction to the electrode sheet production system. The electrode sheet production system is configured to determine a to-be-tested electrode sheet from the currently produced electrode sheet in response to the electrode sheet sampling instruction. The conveying device is configured to convey the to-be-tested electrode sheet from the electrode sheet production system to a preset density detection station where the punching device is located. The punching device is configured to punch the electrode sheet sample from the coating area of the to-be-tested electrode sheet.

[0021] A preset density detection station is added to the existing electrode sheet production line, and the conveying device connects the electrode sheet production system and the punching device at the preset density detection station, forming a full-process and automated production and detection process from electrode sheet production to electrode sheet density detection. The timeliness and efficiency of the electrode sheet density detection are improved, the electrode sheet density can be detected immediately after production, so that the electrode sheet with unqualified density can be identified as soon as possible, the possibility of unqualified electrode sheet flowing into the subsequent process is reduced, the product yield of the subsequent process is improved, and production resources are saved.

[0022] The third aspect of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method of the first aspect.

[0023] The fourth aspect of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method of the first aspect.

[0024] The fifth aspect of the present application provides a computer program product, comprising a computer program, and the computer program is executed by a processor to implement the method of the first aspect.

[0025] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are included to provide a better understanding of the embodiments of the present application, and should not be considered limiting of the present application. Moreover, in the accompanying drawings, like reference numerals denote same or similar components. In the drawings: Figure 1 A flowchart of a compactness detection method of an electrode plate according to some embodiments of the present application; Figure 2 A structural schematic diagram of a preset density detection device according to some embodiments of the present application; Figure 3 A schematic diagram of a compactness detection system of an electrode plate according to some embodiments of the present application; Figure 4 Another schematic diagram of a compactness detection system of an electrode plate according to some embodiments of the present application; Figure 5 A structural schematic diagram of a compactness detection device of an electrode plate according to some embodiments of the present application; Figure 6 A structural schematic diagram of an electronic device according to some embodiments of the present application. DETAILED DESCRIPTION

[0027] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0028] Unless otherwise defined, 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 present application; the description and claims of the present application as well as the above abstract are not to be limited to the specific embodiments described herein; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "comprised of" as used herein are synonymous with "including," "includes" or "containing," "contains," and are inclusive or open-ended and do not exclude additional, unrecited elements or method steps.

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

[0030] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification are not necessarily all referring to the same embodiment, or are necessarily referring to different or alternative embodiments to one another. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0031] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0032] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the term "determine" can cover a variety of actions. For example, "determine" can include calculating, computing, processing, deriving, investigating, looking up (such as, for example, looking up in a table, a database or another data structure), ascertaining and the like. Also, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, "determine" can include resolving, selecting, choosing, establishing and the like.

[0034] The density of the pole piece is used to measure the compaction degree of the pole piece, and the compaction degree of the pole piece has a great influence on the performance of the battery made of the pole piece. Especially for solid-state batteries, the electrolyte of the solid-state battery is a solid material, and there is no continuous flowing liquid interface between the positive and negative electrodes and the electrolyte, and the ion conduction is completed by the solid phase. The solid-state electrolyte of the solid-state battery is usually formed by coating a solid-state electrolyte material on the positive pole piece. Therefore, the density of the positive pole piece and the negative pole piece in the solid-state battery has a great influence on the charge and discharge performance of the solid-state battery, and it is necessary to realize and maintain high density and low porosity of the pole piece of the solid-state battery to ensure that the particles in the pole piece are in close contact, which is a prerequisite for ensuring low impedance, high safety and long life of the solid-state battery, and is very important for the commercialization of the solid-state battery.

[0035] The quality detection methods commonly used in battery manufacturing of related technologies, such as Archimedes drainage method, geometric density calculation, and even part of X-ray tomography analysis, mainly provide the overall or average density data of the pole piece. Although the density is related to the density, the density value cannot fully and accurately represent the actual density. Therefore, the existing method based on density measurement cannot accurately evaluate the compaction degree of the microstructure which plays a decisive role in the performance of the battery, and cannot meet the deep-seated needs of optimizing the process and ensuring the reliability of the battery, and it is urgent to develop a new detection technology which can directly and quantitatively represent the density of the microstructure of the pole piece.

[0036] Therefore, the present application provides a pole piece density detection method, which obtains the original physical parameters of the pole piece sample; obtains the apparent physical parameters of the pole piece sample, the apparent physical parameters being the physical parameters of the pole piece sample after sealing treatment; the apparent physical parameters include the apparent density of the pole piece sample; and determines the density of the pole piece sample based on the original physical parameters and the apparent physical parameters.

[0037] The method seals the pole piece sample, which can effectively isolate the complex topography such as openings, recesses or gaps on the surface of the pole piece sample, thereby helping to accurately obtain the real apparent physical parameters of the pole piece sample, and combining the original physical parameters of the pole piece sample, the actual density of the pole piece sample can be actually calculated, the quantitative analysis of the density of the pole piece is realized, and the internal compaction degree and pore structure of the pole piece can be reliably evaluated.

[0038] In the embodiments of the present application, the pole piece sample can be a pole piece from a solid-state battery or a liquid-state battery, and the pole piece can be a positive pole piece or a negative pole piece. For the positive pole piece used in the solid-state battery, the positive pole piece can be coated with a solid-state electrolyte material, or it can be a positive pole piece without coating a solid-state electrolyte material.

[0039] The solid-state battery can include, but is not limited to, a solid-state battery cell, a solid-state battery module, a solid-state battery pack, and the like. The solid-state battery can include a solid-state battery of any electrolyte material and positive and negative electrode system, such as a polymer solid-state battery, an oxide solid-state battery, a sulfide solid-state battery, a composite electrolyte solid-state battery, a solid-state lithium ion battery, a solid-state lithium metal battery, and the like. The liquid-state battery refers to a battery using a liquid electrolyte. The liquid-state battery can include, but is not limited to, a zinc-manganese battery, a lead-acid battery, a lithium ion battery, and the like.

[0040] The solid-state battery and the liquid-state battery can be applied to any application field requiring power supply or power storage, such as consumer electronics, new energy vehicles, energy storage systems, aerospace, humanoid robots, deep sea exploration, flexible electronics, and the like. The method for detecting the density of the pole piece provided by the embodiments of the present application can be applied to any process and link in the production and application of the pole piece.

[0041] Some embodiments of the present application provide a method, system, device, storage medium and program product for detecting the density of a pole piece.

[0042] Referring to Figure 1 , a method for detecting the density of a pole piece is shown, which specifically includes the following steps S101-S103.

[0043] In step S101, the original physical parameters of the pole piece sample are obtained. The original physical parameters are physical quantities representing the intrinsic properties of the pole piece sample after excluding the influence of the open space on the surface of the pole piece sample; In step S102, the apparent physical parameters of the pole piece sample are obtained. The apparent physical parameters are the physical parameters of the pole piece sample after sealing treatment; the apparent physical parameters include the apparent density of the pole piece sample; the sealing treatment is to form a sealing layer on the surface of the pole piece sample to close the open space on the surface of the pole piece sample; In step S103, the density of the pole piece sample is determined based on the original physical parameters and the apparent physical parameters.

[0044] The execution subject of the embodiments of the present application can be a detection system for detecting the density of the pole piece. The detection system can include a controller, and the controller can execute the operations of steps S101-S103.

[0045] The pole piece sample can be a part of the pole piece cut from a whole pole piece product. The pole piece sample can be a sample of a positive pole piece or a negative pole piece. For a positive pole piece used to prepare a solid-state battery, the positive pole piece can be coated with a solid-state electrolyte material, or can not be coated with a solid-state electrolyte material.

[0046] The original physical parameter of the pole piece sample is a physical quantity representing the intrinsic property of the pole piece sample itself after excluding the influence of the open space on the surface of the pole piece sample, and can reflect the essential physical attribute of the material and internal structure of the pole piece sample. The open space includes but is not limited to pores, recesses, cracks, scratches and other surface defects or uneven places on the surface of the pole piece sample.

[0047] After the sealing treatment of the pole piece sample, a sealing layer is formed on the surface of the pole piece sample, which covers the surface of the pole piece sample and seals the open space on the surface of the pole piece sample, thereby forming an isolation barrier. The sealing layer realizes sealing by forming a dense and continuous layer on the surface of the pole piece sample without penetrating into the open space on the surface of the pole piece sample. The sealing layer forms a continuous covering film on the surface of the pole piece sample, which bridges the open space on the surface of the pole piece sample and isolates the open space from the external environment.

[0048] The apparent physical parameter of the pole piece sample is used to characterize the apparent attribute of the pole piece sample, and is a physical property that can be directly measured or observed by the pole piece sample (including the open space on the surface thereof). The apparent physical parameter of the pole piece sample includes the apparent density and apparent volume of the pole piece sample.

[0049] By sealing the pole piece sample, the open space on the surface of the pole piece sample is effectively isolated, so that the subsequent obtained apparent physical parameter is consistent with the true apparent attribute of the pole piece sample. Further, in combination with the original physical parameter of the pole piece sample, the actual density of the pole piece sample can be accurately calculated, the quantitative analysis of the pole piece density is realized, and the precision of the calculated density is improved, thereby enabling reliable evaluation of the pole piece quality.

[0050] In some embodiments of the present application, the pole piece sample can be cut from a whole pole piece. After obtaining the pole piece sample, the original physical parameter of the pole piece sample is obtained, which can include but is not limited to the original volume, original weight and original density of the pole piece sample. The preset density detection device and the preset weight detection device are pre-set in the pole piece density detection system. The original weight of the pole piece sample is detected by the preset weight detection device, and the original volume of the pole piece sample is detected by the preset density detection device. The ratio of the original weight to the original volume of the pole piece sample is calculated to obtain the original density of the pole piece sample.

[0051] The preset weight detection device can include but is not limited to an electronic scale, a precision balance and the like. The preset density detection device can include but is not limited to a true density analyzer, a nitrogen adsorption instrument and the like. The preset density detection device has two chambers, i.e. a reference chamber and a sample chamber, which are connected by a pipeline, and a valve is arranged on the pipeline, as shown in Figure 2 .

[0052] As an example, the preset density detection device can be a helium true density analyzer, the volume of the reference chamber is V1, and the volume of the sample chamber is V2. Before detecting the original volume of the pole piece sample, the valve between the reference chamber and the sample chamber is closed. The pole piece sample is placed in the sample chamber, helium is first injected into the reference chamber, and the gas pressure P1 in the reference chamber after being filled with helium is detected. Then the valve is opened, and the helium diffuses into the sample chamber. When the gas pressures in the reference chamber and the sample chamber are detected to be the same, the gas pressure P2 at this time is recorded. According to the Boyle's law P1*V1=P2*(V1+V2-V 样品 solving the equation to obtain the original volume V 样品 of the pole piece sample.

[0053] Since the gas can fill the open space such as pores, recesses, cracks and the like on the surface of the pole piece sample, the volume detected by the helium true density analyzer is the original volume excluding the influence of the open space on the surface of the pole piece sample.

[0054] After obtaining the original volume and the original weight of the pole piece sample in the above manner, the pole piece sample is sealed to form a sealing layer on the surface of the pole piece sample. The sealing layer can be formed by a preset substance, which has the properties of thermoplasticity, film-forming property and chemical inertness. Thermoplasticity means that the preset substance can melt when heated and solidify when cooled. Film-forming property means that the preset substance can form a dense, non-porous continuous film, which can not only block the penetration of liquid but also effectively block the penetration of gas. Chemical inertness means that the preset substance is very stable and is not prone to react with oxygen and moisture in the air. The preset substance can be, but is not limited to, paraffin, vaseline and the like.

[0055] Since the open space such as pores, cracks and recesses on the surface of the pole piece sample has a very small size, usually in microns or even nanometers. The molecules of the preset substance are relatively large and difficult to fill into the open space, so the sealing layer formed only covers the open space and isolates the open space from the external environment. Therefore, when the volume of the pole piece sample with the sealing layer is detected by the preset density detection device, the gas will not penetrate into the open space on the surface of the pole piece sample through the sealing layer, thereby helping to accurately detect the true apparent volume of the pole piece sample, and further improving the accuracy of the final obtained density of the pole piece sample.

[0056] In some embodiments of the present application, after the pole piece sample is sealed, the apparent physical parameters of the pole piece sample are obtained by the following method, including: obtaining the target volume of the pole piece sample after sealing, and obtaining the target weight of the pole piece sample after sealing; determining the apparent physical parameters of the pole piece sample based on the original physical parameters, the target volume and the target weight.

[0057] The target volume mentioned above includes the apparent volume of the electrode sample and the volume of the sealing layer. The target weight mentioned above includes the original weight of the electrode sample and the weight of the sealing layer.

[0058] The process of detecting the target volume of an electrode sample with a sealing layer using a preset density detection device is the same as the process of detecting the original volume of an electrode sample before sealing using a preset density detection device, and will not be repeated here.

[0059] Because the sealing process isolates the open space on the surface of the electrode sample from the external space, the gas (such as helium or nitrogen) filled into the sample chamber cannot penetrate the sealing layer into the open space on the surface of the electrode sample during the detection of the target volume of the sealed electrode sample. Therefore, the detected target volume includes the apparent volume of the electrode sample and the volume of the sealing layer, which helps to accurately obtain the apparent physical parameters of the electrode sample, improves the accuracy of the apparent physical parameters, and thus improves the accuracy of the final obtained density of the electrode sample.

[0060] In some embodiments of this application, the apparent physical parameters of the electrode sample are determined in the following ways: calculating the difference between the target weight and the original weight of the electrode sample, which are included in the original physical parameters, to obtain the weight of the sealing layer on the surface of the sealed electrode sample; obtaining the volume of the sealing layer based on the weight of the sealing layer and the preset density of the preset material constituting the sealing layer; calculating the difference between the target volume and the volume of the sealing layer to obtain the apparent volume of the electrode sample; and obtaining the apparent density of the electrode sample based on the original weight and apparent volume of the electrode sample.

[0061] The target weight mentioned above is the sum of the original weight of the electrode sample and the weight of the sealing layer. Therefore, the difference between the target weight and the original weight of the electrode sample is the weight of the sealing layer. Since the preset material is a known substance, its density is known and pre-configured into the system. Therefore, after obtaining the weight of the sealing layer, the ratio of the weight of the sealing layer to the preset density of the preset material is calculated to obtain the volume of the sealing layer.

[0062] The target volume of an electrode sample with a sealing layer is the sum of the apparent volume of the electrode sample and the volume of the sealing layer. Therefore, calculating the difference between the target volume and the volume of the sealing layer yields the apparent volume of the electrode sample. Calculating the ratio of the original weight to the apparent volume of the electrode sample gives the apparent density of the electrode sample.

[0063] By precisely measuring the target volume and target weight of the electrode sample with the sealing layer, the apparent density of the electrode sample was accurately calculated, realizing the quantitative analysis of the apparent density of the electrode sample, and thus enabling the subsequent quantitative analysis of the density of the electrode sample.

[0064] In some embodiments of this application, determining the density of an electrode sample based on original physical parameters and apparent physical parameters includes: obtaining the original density of the electrode sample based on the original weight and original volume of the electrode sample included in the original physical parameters; and calculating the density of the electrode sample based on the original density and the apparent density of the electrode sample included in the apparent physical parameters.

[0065] The ratio of the apparent density to the original density of the electrode sample is calculated, and this ratio is used as the density of the electrode sample. By precisely measuring the original volume and apparent volume of the electrode sample, the density deviation caused by the simplification of the assumed particle packing model or volume measurement errors in traditional estimation methods is reduced. This makes the final calculated density closer to the true material state of the electrode sample, realizing quantitative analysis of electrode density and achieving high accuracy in determining density.

[0066] In some embodiments of this application, after determining the density of the electrode sample, the method further includes: performing a quality test on the electrode sample based on the density to obtain a quality test result; and sending feedback information to the electrode production system when the quality test result indicates that the electrode sample has a density defect, so that the electrode production system can adjust the electrode production parameters based on the feedback information.

[0067] After obtaining the density of the electrode sample using the method described above, its density can be compared with a preset density range. If the density of the electrode sample is within the preset density range, the density of the electrode sample is deemed acceptable. If it is not within the preset density range, the density of the electrode sample is deemed unacceptable. The above quality test results can be used to characterize whether the density of the electrode sample is acceptable.

[0068] If the density of an electrode sample is within acceptable limits, the production batch of electrodes corresponding to that sample can be considered to have acceptable density. If the density of an electrode sample is unacceptable, the production batch of electrodes corresponding to that sample can be considered to have unacceptable density. In this case, the batch of electrodes can be recycled, or operations such as recoating and compaction can be used to correct the density of the batch of electrodes.

[0069] If the density of the electrode sample is unqualified, it indicates a problem with the current electrode production parameters in the electrode production system, resulting in density defects in the produced electrodes. Therefore, feedback information can be sent to the electrode production system, which can include the density of the electrode sample. Upon receiving this feedback, the electrode production system adjusts the current electrode production parameters based on the deviation of the electrode sample's density from a preset density range, thereby ensuring that the density of subsequently produced electrodes falls within the preset density range.

[0070] The above method enables quality inspection of electrodes produced by the electrode production system based on the density of electrode samples. When density defects are found in the electrode samples, feedback information is provided to the electrode production system, allowing it to accurately adjust electrode production parameters. This improves electrode production quality and the consistency of density in the produced electrodes, thereby increasing the yield of subsequent cell manufacturing processes, reducing battery performance failures or safety hazards caused by defective products entering the market due to density defects, and lowering quality costs.

[0071] Measuring the apparent volume of the electrode sample requires controlling the uniformity and consistency of the sealing layer. In some embodiments of this application, the sealing device can be controlled to adjust the temperature to completely melt the preset substance into a liquid state and maintain it in a constant temperature environment for a period of time to obtain a liquid with uniform composition and no bubbles. Then, the sealing device is controlled to immerse the electrode sample in the liquid, and the lifting mechanism controlled by the motor in the sealing device is used to lift the electrode sample from the liquid at a uniform speed without shaking, so that the sealing layer formed on the surface of the electrode sample is of uniform thickness, reducing the measurement error of the sealing layer.

[0072] The embodiments of this application utilize a preset density detection device to detect the volume of electrode samples before and after sealing. The preset density detection device automatically adjusts the inflation rate and environmental parameters (such as temperature and humidity) through feedback to ensure that the measurement signal-to-noise ratio meets the requirements and to reduce measurement errors caused by fluctuations in environmental parameters and inflation rate.

[0073] The electrode density detection method provided in this application has strong universality and can be applied to the detection of electrodes with different material systems. At the same time, it provides a technical foundation for the subsequent development of multi-parameter comprehensive detection technology (such as combining cell thickness, electrolyte distribution, etc.).

[0074] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0075] Other embodiments of this application also provide a density detection system for electrode sheets, such as... Figure 3 As shown, the density detection system includes: a density detection device 1 and a sealing device 2; The sealing device 2 is used to form a sealing layer on the surface of the electrode sample, which covers the open space on the surface of the electrode sample and isolates the open space from the external environment. Density detection device 1 is used to perform the density detection method provided in the foregoing embodiments.

[0076] The sealing device 2 described above is a device capable of forming a sealing layer on the surface of the electrode sample. In the embodiments of this application, an online detection station for detecting electrode density can be set up on the electrode production line. The sealing device 2 is installed at this detection station, and the electrodes produced on the electrode production line can be sampled. The sampled electrodes can be transferred to the detection station for detecting density. At this station, an electrode sample is cut from the sampled electrode, and the density of the electrode sample is detected using the operations of steps S101-S103 described above. During this process, the sealing device 2 installed at this station forms a sealing layer on the surface of the electrode sample.

[0077] By forming a sealing layer on the surface of the electrode sample through the sealing device 2, the open space on the surface of the electrode sample can be effectively isolated, so that the subsequent obtained apparent physical parameters can match the true apparent properties of the electrode sample. Furthermore, combined with the original physical parameters of the electrode sample, the actual density of the electrode sample can be accurately calculated, realizing the quantitative analysis of the electrode density and improving the accuracy of the calculated density, thereby enabling a reliable evaluation of the electrode quality.

[0078] The sealing device 2 coats the surface of the electrode sample with a liquid preset substance; and adjusts the temperature to cool and solidify the liquid preset substance on the surface of the electrode sample to form a sealing layer.

[0079] First, control the sealing device 2 to raise the temperature to the melting point of the preset substance, so that the preset substance melts into a liquid state. Then, control the sealing device 2 to place the electrode sample into the molten preset substance, or control the sealing device 2 to spray or apply the molten preset substance to the surface of the electrode sample. After confirming that the surface of the electrode sample is covered with the liquid preset substance, control the sealing device 2 to lower the temperature, so that the preset substance covering the surface of the electrode sample solidifies upon cooling, thereby forming a sealing layer on the surface of the electrode sample.

[0080] Because the open spaces such as pores, cracks, and depressions on the surface of electrode samples are very small, typically on the micrometer or even nanometer scale, while the molecules of the pre-selected material are relatively large and difficult to fill into these open spaces, the resulting sealing layer merely covers these spaces, isolating them from the external environment. Consequently, when the volume of the electrode sample with the sealing layer is subsequently measured using a pre-selected density detection device, gas will not permeate through the sealing layer into the open spaces on the electrode sample surface. This helps to accurately determine the true apparent volume of the electrode sample, thereby improving the accuracy of the final electrode sample density measurement.

[0081] In some embodiments of this application, such as Figure 4 As shown, the density detection system also includes: electrode production system 3, conveying device 4, and punching device 5; Density testing equipment 1 is also used to send electrode sampling instructions to the electrode production system; Electrode production system 3 is used to identify the electrode to be tested from the currently produced electrode sheets in response to an electrode sampling instruction; Conveying device 4 is used to convey the electrode sheet to be tested from the electrode sheet production system to the preset density detection station where the punching device 5 is located; The punching device 5 is used to punch out the coating area of ​​the electrode to be tested to obtain an electrode sample.

[0082] The electrode production system 3 is the core of the front-end process in battery manufacturing. It refers to the entire integrated and continuous production equipment and technology process for turning battery active materials into positive and negative electrode sheets. The task of the electrode production system 3 is to uniformly, stably, and efficiently coat the slurry (composed of active materials, conductive agents, binders, etc.) onto the metal current collector (such as aluminum foil for the positive electrode and copper foil for the negative electrode), and then manufacture standard electrode sheets through processes such as drying, rolling, and slitting.

[0083] The electrode sampling inspection command is issued by the density detection system used for density testing, instructing the electrode production system 3 to provide the electrode to be tested. After receiving the electrode sampling inspection command, the electrode production system 3 can randomly select one electrode from the currently produced electrodes as the electrode to be tested, or it can select the electrode whose production completion time is closest to the time of receiving the electrode sampling inspection command as the electrode to be tested.

[0084] The conveying device 4 refers to the complete automated material transfer and control system that is responsible for carrying, guiding and controlling the metal current collector (foil) and the coated wet / dry electrode throughout the entire electrode production process, so that it can smoothly pass through each process module (such as coating, drying, rolling and slitting) with constant tension, stable path and precise speed.

[0085] The preset density testing station is a newly added processing station in the electrode production process according to the embodiments of this application. It is a specific location or equipment system on the electrode production line, dedicated to measuring the density of the electrode online or offline. After the electrode production system 3 selects the electrode to be tested, the conveying device 4 conveys the electrode to be tested to the location of the preset density testing station.

[0086] A punching device 5 and a sealing device 2 are installed at the preset density testing station. The punching device 5 at the preset density testing station is an automated device that uses a mold to punch and precisely process the electrode sheet to be tested into an electrode sample of a specific shape and size. The sealing device 2 is a device that seals the electrode sample, forming a sealing layer on the surface of the electrode sample. The sealing device 2 can be an automated or semi-automated device, or it can be a device that requires manual operation to complete the sealing.

[0087] After the conveying device 4 conveys the electrode to be tested to the preset density detection station, the punching device 5 is first controlled to punch the electrode to obtain an electrode sample. The punching device 5 is pre-configured with punching parameters for the electrode sample, which may include, but are not limited to, parameters such as the shape and size of the electrode sample. The shape of the electrode sample may be, but is not limited to, circular, elliptical, rectangular, and triangular. The size of the electrode sample may be, but is not limited to, the radius or diameter when the electrode sample is circular, the side length when the electrode sample is rectangular, the perimeter, and the area of ​​the electrode sample. The punching device 5 punches the electrode sample from the electrode to be tested according to the pre-configured punching parameters. The size of the obtained electrode sample is smaller than a preset size threshold, and the weight of the electrode sample is greater than a preset weight threshold. As an example, when the shape of the electrode sample is circular, the preset size threshold may be, but is not limited to, 10mm, 15mm, etc. The preset weight threshold may be, but is not limited to, 1g, 2g, etc.

[0088] By limiting the size of the electrode sample to less than a preset size threshold, it is possible to prevent the die-cut electrode samples from being too large, thus avoiding waste of electrode material. By limiting the weight of the electrode sample to more than a preset weight threshold, it is possible to reduce the possibility of inaccurate subsequent density testing due to excessively low electrode sample weight.

[0089] The electrode sheet includes a coated area and a blank area. The coated area is where the active material is applied to the electrode sheet, and it is the site of electrochemical reactions, used for storing and releasing energy. The blank area is a clean area exposing the current collector foil, serving as a channel for collecting and conducting current, and is used to connect to external circuits in the battery. During the electrode sheet production process, after the active material is coated onto the current collector, it is compacted. The density of the active material on the electrode sheet after compaction has a significant impact on the electrode sheet's performance. The electrode sheet density to be tested in this embodiment is the density of the coated area on the electrode sheet. Therefore, before the punching device 5 punches the electrode sheet to be tested to obtain an electrode sheet sample, it is necessary to first identify the coated area of ​​the electrode sheet to be tested.

[0090] In some embodiments, the punching device 5 is equipped with an imaging device to capture images of the surface of the electrode to be tested. Because the blank areas of the electrode have high light transmittance, they appear as bright colors in the image, while the coated areas are almost opaque and appear as dark colors. By analyzing the contrast of different areas in the image, the coated areas of the electrode to be tested can be accurately identified.

[0091] In other embodiments, a ranging device can be provided on the punching device 5. Since the thickness of the coating area is greater than that of the blank area, there is a height difference between the two areas. Therefore, the ranging device can detect the boundary line between the coating area and the blank area, thereby identifying the coating area of ​​the electrode to be tested.

[0092] After identifying the coating area, the punching device 5 punches an electrode sample from the coating area according to the aforementioned punching parameters. The punching device 5 can punch the electrode sample along either the MD (Machine Direction) or CD (Cross Direction) direction of the electrode to be tested. The MD direction is the direction in which the electrode is processed and conveyed on the production line, while the CD direction is the direction perpendicular to the MD direction on the surface of the electrode to be tested.

[0093] By adding a pre-set density testing station to the existing electrode production line in the above manner, the electrode production system 3 is connected to the pre-set density testing station through the conveying device 4, forming a fully automated production and testing process from electrode production to electrode density testing. This improves the timeliness and efficiency of electrode density testing, enabling density testing to be performed immediately after electrode production. This allows for the rapid identification of electrodes with unqualified density, reducing the possibility of unqualified electrodes flowing into subsequent processes, improving the product yield of subsequent processes, and saving production resources.

[0094] In other embodiments of this application, the device for cutting electrode samples can be set up in any scenario, such as in a laboratory or battery repair station, to cut electrode samples from the electrode to be tested. In these scenarios, the electrode to be tested can be an electrode that has undergone any process such as rolling, drying, or stacking, or it can be an electrode disassembled from a manufactured battery system. Here, the battery system can be a cell, battery module, or battery pack, etc. This method enables density testing of electrode samples under any circumstances, expanding the applicability of the density testing method of the embodiments of this application.

[0095] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0096] To facilitate understanding of the electrode density detection method provided in this application embodiment, the following example uses an electrode used in manufacturing solid-state battery cells. A circular electrode sample s is cut from this electrode.

[0097] Preheat the reference chamber and sample chamber of the helium true density analyzer to a constant temperature of 35°C. Place the electrode sample s in the sample chamber and seal it. The sample chamber of the helium true density analyzer integrates a weight sensor; weigh the electrode sample s using the weight sensor to obtain its true mass of 2.5111 g. Turn on the vacuum pump and vacuum system, and open the gas valve between the sample chamber and the reference chamber to purge the air from both chambers and obtain a vacuum environment. Open the helium inlet valve to fill the reference chamber with helium. Close the inlet valve to allow the helium to preheat in the fixed-volume reference chamber. The amount of helium injected at this point can be expressed as P1*V1, where P1 is the pressure in the reference chamber and V1 is the volume of the reference chamber. Open the gas valve between the two chambers to allow the helium in the reference chamber to escape into the sample chamber. Once the pressure in the reference chamber and sample chamber stabilizes, express the amount of helium at this point as P2*V3. Where P2 is the air pressure in the reference chamber and the sample chamber at this time, V3 = V1 + V2 - V, V2 is the volume of the sample chamber, and V is the original volume of the electrode sample s. Calculate the ratio between the actual mass and the original volume of the electrode sample s to obtain the original density of the electrode sample s.

[0098] Thirteen measurements were performed as described above to obtain 13 sets of original physical parameters for the electrode sample s. These original physical parameters included the true mass, original volume, and original density of the electrode sample s. The volume mean, standard deviation, and RSD (relative standard deviation) of the original volume of the electrode sample s, as well as the density mean, standard deviation, and RSD of the original density of the electrode sample s, were calculated, as shown in Table 1.

[0099] Table 1

[0100] The sample battery s was placed in heated paraffin wax. After the electrode sample s was completely wrapped in paraffin wax, it was placed in the sample chamber of a helium true density analyzer. The above method was used to perform 8 tests, and the data obtained are shown in Table 2.

[0101] Table 2

[0102] Based on the data of electrode sample s before wax sealing shown in Table 1 and the data of electrode sample s after wax sealing shown in Table 2, the density results of electrode sample s are calculated as shown in Table 3.

[0103] Table 3

[0104] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0105] Some embodiments of this application provide an electrode density detection device, which applies the electrode density detection method provided in the above embodiments. For example... Figure 5 As shown, the device includes: The first acquisition module 201 is used to acquire the original physical parameters of the electrode sample; The second acquisition module 202 is used to acquire the apparent physical parameters of the electrode sample; the apparent physical parameters are the physical parameters of the electrode sample after sealing treatment; the apparent physical parameters include the apparent density of the electrode sample. The determination module 203 is used to determine the density of the electrode sample based on the original physical parameters and the apparent physical parameters.

[0106] The second acquisition module 202 is used to acquire the target volume of the sealed electrode sample and the target weight of the sealed electrode sample; and to determine the apparent physical parameters of the electrode sample based on the original physical parameters, the target volume and the target weight.

[0107] The second acquisition module 202 is used to calculate the difference between the target weight and the original weight of the electrode sample, including the original physical parameters, to obtain the weight of the sealing layer on the surface of the electrode sample after sealing treatment; based on the weight of the sealing layer and the preset density of the preset material constituting the sealing layer, to obtain the volume of the sealing layer; calculate the difference between the target volume and the volume of the sealing layer to obtain the apparent volume of the electrode sample; and based on the original weight and apparent volume of the electrode sample, to obtain the apparent density of the electrode sample.

[0108] The determination module 203 is used to obtain the original density of the electrode sample based on the original weight and original volume of the electrode sample, which are included in the original physical parameters; and to calculate the compactness of the electrode sample based on the original density and the apparent density of the electrode sample, which are included in the apparent physical parameters.

[0109] The device also includes: a feedback module for performing quality testing on electrode samples based on density to obtain quality testing results; and sending feedback information to the electrode production system when the quality testing results indicate that the electrode sample has density defects, so that the electrode production system can adjust the electrode production parameters based on the feedback information.

[0110] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0111] Other embodiments of this application provide an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the electrode density detection method of any of the above embodiments.

[0112] like Figure 6 As shown, the electronic device 60 may include: a processor 600, a memory 601, a bus 602 and a communication interface 603. The processor 600, the communication interface 603 and the memory 601 are connected through the bus 602. The memory 601 stores a computer program that can run on the processor 600. When the processor 600 runs the computer program, it executes the method provided in any of the foregoing embodiments of this application.

[0113] The memory 601 may include high-speed random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage device. Communication between the device network element and at least one other network element is achieved through at least one communication interface 603 (which may be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc.

[0114] Bus 602 can be an ISA bus, PCI bus, or EISA bus, etc. Buses can be divided into address buses, data buses, control buses, etc. Memory 601 stores computer programs. After receiving execution instructions, processor 600 executes the computer program. The methods disclosed in any of the foregoing embodiments of this application can be applied to processor 600, or implemented by processor 600.

[0115] The processor 600 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 600 or by instructions in software form. The processor 600 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), an Off-the-shelf Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 601. Processor 600 reads the information in memory 601 and, in conjunction with its hardware, completes the steps of the above method.

[0116] The electronic devices and methods provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods they employ, operate, or implement.

[0117] Other embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the methods of any of the above embodiments.

[0118] The computer-readable storage medium provided in the embodiments of this application and the method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods used, operated or implemented therein.

[0119] This application also provides a computer program product corresponding to the method provided in the foregoing embodiments. The computer program product includes a computer program that is executed by a processor to implement the method provided in the foregoing embodiments.

[0120] The computer program products provided in the above embodiments of this application and the methods provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application models stored therein.

[0121] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting the density of an electrode sheet, characterized in that, The method comprises: obtaining an original physical parameter of the pole piece sample, the original physical parameter being a physical quantity representing an intrinsic property of the pole piece sample excluding the influence of open space on the surface of the pole piece sample; obtaining an apparent physical parameter of the pole piece sample, the apparent physical parameter being a physical parameter of the pole piece sample after a sealing treatment; the apparent physical parameter comprising an apparent density of the pole piece sample; the sealing treatment being a process of forming a sealing layer on the surface of the pole piece sample to seal the open space on the surface of the pole piece sample; determining a compactness of the pole piece sample based on the original physical parameter and the apparent physical parameter.

2. The method of claim 1, wherein, The method of obtaining the apparent physical parameter of the pole piece sample comprises: obtaining a target volume of the pole piece sample after the sealing treatment; obtaining a target weight of the pole piece sample after the sealing treatment; determining the apparent physical parameter of the pole piece sample based on the original physical parameter, the target volume and the target weight.

3. The method of claim 2, wherein, The method of determining the apparent physical parameter of the pole piece sample based on the original physical parameter, the target volume and the target weight comprises: calculating a difference between the target weight and an original weight of the pole piece sample included in the original physical parameter to obtain a weight of the sealing layer on the surface of the pole piece sample after the sealing treatment; obtaining a volume of the sealing layer based on the weight of the sealing layer and a preset density of a preset substance constituting the sealing layer; calculating a difference between the target volume and the volume of the sealing layer to obtain an apparent volume of the pole piece sample; obtaining the apparent density of the pole piece sample based on the original weight of the pole piece sample and the apparent volume.

4. The method according to any one of claims 1 to 3, characterized in that, The method of determining the compactness of the pole piece sample based on the original physical parameter and the apparent physical parameter comprises: obtaining an original density of the pole piece sample based on an original weight and an original volume of the pole piece sample included in the original physical parameter; calculating the compactness of the pole piece sample based on the original density and an apparent density of the pole piece sample included in the apparent physical parameter.

5. The method according to any one of claims 1 to 3, characterized in that, After determining the compactness of the pole piece sample, the method further comprises: performing quality detection on the pole piece sample based on the compactness to obtain a quality detection result; in a case where the quality detection result indicates that the pole piece sample has a compactness defect, sending feedback information to a pole piece production system to enable the pole piece production system to adjust pole piece production parameters based on the feedback information.

6. A system for detecting density of an electrode tab, the system comprising: The system comprises a compactness detection device and a sealing device. The sealing device is configured to form a sealing layer on the surface of the pole piece sample, the sealing layer covering open space on the surface of the pole piece sample and isolating the open space from an external environment. The density detection device is configured to perform the compactness detection method according to any one of claims 1-5.

7. The compactness detection system according to claim 6, wherein the sealing device is configured to coat the surface of the pole piece sample with a preset substance in a liquid state, and adjust a temperature to cause the preset substance in a liquid state on the surface of the pole piece sample to cool and solidify to form the sealing layer. ​ 8. The compactness detection system of claim 6, wherein, The density detection system further comprises a pole piece production system, a conveying device and a punching device; The density detection device is further configured to send a pole piece sampling instruction to the pole piece production system; The pole piece production system is configured to determine a to-be-tested pole piece from currently produced pole pieces in response to the pole piece sampling instruction; The conveying device is configured to convey the to-be-tested pole piece from the pole piece production system to a preset density detection station where the punching device is located; The punching device is configured to punch the pole piece sample from a coating area of the to-be-tested pole piece.

9. An electronic device, comprising: A computer program product comprising a memory, a processor, and a computer program stored on the memory and loadable on the processor, the processor being configured to execute the computer program to implement the method of any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, A computer readable storage medium having stored therein a computer program, the computer program being executable by a processor to implement the method of any one of claims 1-5.

11. A computer program product, characterised in that, A computer program product comprising a computer program, the computer program being executable by a processor to implement the method of any one of claims 1-5.

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