Method and device for testing electromagnetic compatibility of power battery applying metal film

Abstract

The invention provides a method and a device for testing electromagnetic compatibility of a power battery applying a metal film, and the method comprises the steps: firstly, building a first shielding effectiveness model which is related with the effect of the material and the layer number of the metal film on a shielding effect; then, a plurality of samples are manufactured, the shielding effectiveness of the samples is actually measured, the model is verified and adjusted, and a more accurate second shielding effectiveness model is formed; finally, the model is applied to a power battery electronic component, and a third shielding effectiveness model is determined through further test verification; according to the invention, a scientific basis can be provided for electromagnetic compatibility evaluation of the power battery.

Description

Technical Field

[0001] The present application relates to the field of battery testing, and in particular to a method and device for testing electromagnetic compatibility of a power battery using a metal film. Background Art

[0002] With the rapid popularization of electric vehicles, consumers and automakers are paying more and more attention to battery safety issues. Power batteries are not only the main power source and core components of electric vehicles, but also the main technical barrier to their rapid development. Lithium batteries are widely used in mobile phones, electric vehicles, mobile power supplies and other fields due to their high energy density, high cycle life and high environmental protection.

[0003] Information security issues in the field of electric vehicle power battery technology have attracted much attention due to electromagnetic radiation, because it directly affects the accuracy of testing and data analysis during the use of power batteries. Therefore, finding ways to reduce the radiation associated with the operation of electronic equipment is one of the technical problems that need to be solved urgently. The electromagnetic compatibility (EMC) test of power battery packs refers to a series of tests to ensure that the power battery system of electric vehicles will not generate electromagnetic interference or be affected by electromagnetic interference during normal use and operation in an external electromagnetic environment. These tests are usually conducted by test laboratories to verify the EMC performance of new energy vehicle power battery packs. However, the existing testing methods make it difficult to achieve seamless management of the entire life cycle of all batteries, and cannot effectively guide the improvement of lithium-ion batteries. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a method, device, electronic device and storage medium for electromagnetic compatibility testing of power batteries using metal thin films, which can achieve seamless management of the entire life cycle of all batteries, and then study the causes and mechanisms of battery aging and failure, and thus can fundamentally play a guiding role in the improvement of lithium-ion batteries.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for testing electromagnetic compatibility of a power battery using a metal film, the method comprising:

[0007] Constructing a first shielding effectiveness model; wherein the first shielding effectiveness model represents the influence of the number of layers of metal films of different materials on the shielding effectiveness;

[0008] Manufacturing a plurality of samples according to the first shielding effectiveness model, and testing the shielding effectiveness of the plurality of samples, and determining or correcting the first shielding effectiveness model based on the first test result to obtain a second shielding effectiveness model;

[0009] The second shielding effectiveness model is tested by applying the second shielding effectiveness model to power battery electronic components, a third shielding effectiveness model is determined based on the second test result, and the electromagnetic compatibility of the power battery is tested based on the third shielding effectiveness model.

[0010] In a possible implementation manner, constructing the first shielding effectiveness model includes:

[0011] Construct a single-layer shielding effectiveness model;

[0012] Based on the single-layer shielding effectiveness model, an equivalent circuit of an n-layer structure, a field source and a measuring device is constructed through a metal network composed of multiple conductive layers;

[0013] The first shielding effectiveness model is determined based on the equivalent circuit.

[0014] In a possible implementation, the single-layer shielding effectiveness model is:

[0015]

[0016] Among them, k3 represents the single-layer shielding factor, L3 is the shielding inductance, R3 is the shielding impedance, and ω is the magnetic field frequency.

[0017] In a possible implementation, each of the multiple conductive layers includes an inductor L and a resistor R connected in parallel, and a magnetic field is generated by a coil L0 through which an alternating current I0 with a frequency of ω passes, and an electromotive force is induced in a receiving coil L′ in the absence of shielding;

[0018]

[0019] Among them, k is the mutual inductance coefficient of the coil, through I1...I n The current in each shielding layer is represented by a system of n equations.

[0020]

[0021] The mutual inductance between the i-th and j-th coils is represented by L ij express.

[0022] In a possible implementation manner, determining the first shielding effectiveness model based on the equivalent circuit includes:

[0023] The single-layer shielding factor is taken as the ratio of the electromotive force induced in the receiving coil without and with shielding;

[0024]

[0025] Among them, U э caused by eddy currents flowing in the shield;

[0026]

[0027] Available

[0028]

[0029] The first formula for the value of the multi-layer shielding factor is then:

[0030]

[0031] The resistance of the shielding layer and the specific volume resistance of the material making it are obtained by the first formula I Proportional to the layer thickness d i Inversely proportional, inductance is related to the magnetic permeability μ of the material. I is proportional to;

[0032] The first formula is expressed as the second formula:

[0033]

[0034] where A is a scaling factor that depends on the shield geometry;

[0035] The second formula is used as the first shielding effectiveness model.

[0036] In a possible implementation manner, the manufacturing of multiple samples for the first shielding effectiveness model and testing the shielding effectiveness of the multiple samples include:

[0037] A thin film shielding coating is prepared by magnetron sputtering and / or vacuum deposition, and the thin film shielding coating is tested to obtain the characteristics of the thin film shielding coating; wherein the thin film shielding coating uses aluminum and copper as high conductive materials and iron and nickel as ferromagnetic materials, and the thin film shielding coating corresponds to a physical and mechanical parameter, and the physical and mechanical parameter includes surface resistivity, volume resistivity, adhesion, thickness and shielding effectiveness;

[0038] A plurality of 1-n layer thin film shielding coating samples of different materials are manufactured, and the samples are tested respectively to obtain first test results, wherein the first test results at least include the dispersed structure, particle shape, electromagnetic radiation reflection coefficient and frequency dependence of transmittance of the samples.

[0039] In a possible implementation, the method further includes:

[0040] A shielding factor adapted to a target component is determined based on an electromagnetic compatibility test result of a power battery, and a target metal film is determined based on the shielding factor.

[0041] In a second aspect, an embodiment of the present application further provides a power battery electromagnetic compatibility test device using a metal film, the device comprising:

[0042] A construction module, used to construct a first shielding effectiveness model; wherein the first shielding effectiveness model characterizes the influence of the number of layers of metal films of different materials on the shielding effectiveness;

[0043] an optimization module, configured to prepare a plurality of samples for the first shielding effectiveness model, test the shielding effectiveness of the plurality of samples, determine or correct the first shielding effectiveness model based on the first test result, and obtain a second shielding effectiveness model;

[0044] A testing module is used to test the second shielding effectiveness model by applying the second shielding effectiveness model to the electronic components of the power battery, determine a third shielding effectiveness model based on the second test result, and test the electromagnetic compatibility of the power battery based on the third shielding effectiveness model.

[0045] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to execute the electromagnetic compatibility test method for a power battery using a metal film as described in any one of the first aspects.

[0046] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the electromagnetic compatibility testing method for a power battery using a metal film as described in any one of the first aspects is executed.

[0047] Embodiments of the present application Embodiments of the present application have the following beneficial effects:

[0048] (1) Improving the performance and safety of lithium-ion batteries: By accurately studying the effects of different materials and layers of metal films on shielding effectiveness, we can guide the improvement of lithium-ion batteries from a mechanism perspective, significantly improve the electromagnetic shielding effect of the battery, and thus increase its service life and safety. This is of great significance for promoting the commercial application of lithium-ion batteries.

[0049] (2) Lightweight and optimized design: Using transparent metal film as shielding material will not only not increase the weight and size of the equipment, but also can be finely processed using photolithography technology, making it easier to design and manufacture. This method helps to achieve lightweight and optimized design of power batteries and related electronic equipment, and improve their overall performance.

[0050] (3) Enhanced technology scalability: Thin-film shielding coatings are prepared through advanced manufacturing technologies such as magnetron sputtering and vacuum deposition, and accurate analytical models are constructed. These technologies and models have wide applicability. They can be applied not only to the field of lithium-ion batteries, but also to the analysis of other types of power batteries (such as solid-state batteries), providing strong support for the design and optimization of related fields.

[0051] (4) Promote the formation and application of empirical models: Through repeated experiments and model verification, empirical analysis models for metal film shielding performance can be gradually constructed. These models will become important tools for power battery design, optimization and performance evaluation, helping to improve product reliability and market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 is a flowchart of steps S101-S103 provided in an embodiment of the present application;

[0054] Figure 2 It is a flowchart of steps S201-S203 provided in an embodiment of the present application;

[0055] Figure 3 is an equivalent circuit diagram provided in an embodiment of the present application;

[0056] Figure 4 is a T(λ) relationship diagram of a nickel film dispersed on a glass substrate provided in an embodiment of the present application;

[0057] Figure 5 is a graph of R(λ) of a nickel film dispersed on a glass substrate provided in an embodiment of the present application;

[0058] Figure 6 It is a structural schematic diagram of a power battery electromagnetic compatibility test device using a metal film provided in an embodiment of the present application;

[0059] Figure 7It is a schematic diagram of the composition structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0060] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of order, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0061] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0062] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0063] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0064] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0066] See also Figure 1 , Figure 1 is a flow chart of steps S101-S103 of the electromagnetic compatibility test method for a power battery using a metal film provided in an embodiment of the present application, which will be combined with Figure 1 Steps S101-S103 are shown for explanation.

[0067] In step S101, a first shielding effectiveness model is constructed; wherein the first shielding effectiveness model characterizes the influence of the number of layers of metal films of different materials on the shielding effectiveness.

[0068] The embodiments of the present application aim to optimize and verify the effect of metal film in improving the electromagnetic compatibility of power batteries through refined modeling and experimental verification.

[0069] First, through theoretical analysis and preliminary experimental data, a preliminary model was established to describe the effects of different materials (such as copper, aluminum, nickel, etc.) and different numbers of metal films on electromagnetic shielding effectiveness. This model is the basis for subsequent experiments and optimization.

[0070] In some embodiments, see Figure 2 , Figure 2 It is a flow chart of steps S201-S203 provided in an embodiment of the present application. The construction of the first shielding effectiveness model can be achieved through steps S201-S203, which will be described in combination with each step.

[0071] In step S201, a single-layer shielding effectiveness model is constructed;

[0072] Here, in the alternating magnetic field, since the distance between the layers of the film is very close, they will interact with each other, thus affecting the shielding effectiveness. Due to the induced eddy current, the alternating magnetic field can be shielded by the conductive shielding. The calculation method of the single-layer shielding effectiveness is:

[0073]

[0074] Among them, k3 represents the single-layer shielding factor, L3 is the shielding inductance, R3 is the shielding impedance, and ω is the magnetic field frequency.

[0075] In step S202, based on the single-layer shielding effectiveness model, an equivalent circuit of an n-layer structure, a field source and a measuring device is constructed through a metal network composed of multiple conductive layers;

[0076] Here, in practice, it is sometimes necessary to use a metal network composed of several layers of different thicknesses. To analyze the shielding effectiveness of a metal network composed of multiple conductive layers against an alternating magnetic field, it is necessary to consider the following form. Each conductive layer is represented by an equivalent circuit consisting of a parallel inductance L and a resistance R, where L is the layer inductance and R represents the resistance of the screen to the eddy current flowing through it. The equivalent circuit of the n-layer structure, field source and measurement device is as follows: Figure 3 shown.

[0077] The magnetic field is generated by the coil L0 through which the alternating current I0 with a frequency of ω passes. In the absence of shielding, an electromotive force is induced in the receiving coil L', and the formula is:

[0078]

[0079] Where k is the mutual inductance of the coil. Since we are considering a closed shielding device to shield the source, we can assume that the connection between the source and the shield, as well as the connection between the shields, is complete, using I1…I n To represent the current in each shielding layer, a system of n equations can be written for the emf occurring in each layer;

[0080]

[0081] The mutual inductance of the i-th and j-th coils is represented by L ij The shielding factor is found as the ratio of the electromotive force induced in the receiving coil without and with shielding, given by:

[0082]

[0083] Among them, U э is caused by eddy currents flowing in the shield, as shown below:

[0084]

[0085] By using Matlab to calculate, we can get:

[0086]

[0087] Furthermore, the value of the multi-layer shielding factor is:

[0088]

[0089] From the formula, it can be seen that the frequency dependence of the shielding coefficient of the multi-layer shield has not changed compared with the single-layer shield. The resistance of the shielding layer is related to the specific volume resistance (ρ I ) is proportional to the layer thickness (d i ), inductance is inversely proportional to the magnetic permeability of the material (μI ), further, the formula can be expressed as:

[0090]

[0091] where A is a scaling factor that depends on the shield geometry.

[0092] In step S203, the first shielding effectiveness model is determined based on the equivalent circuit.

[0093] Through the above calculations, a single-layer shield of a given thickness made of a metal with high magnetic permeability and low resistivity will have the maximum magnetic field shielding effectiveness. The shielding effectiveness measurement results of aluminum films of various thicknesses in an alternating magnetic field are further compared, as shown in Table 1.

[0094] Table 1

[0095]

[0096] As can be seen from the table above, a single shielding layer of a given thickness made of a metal with high magnetic permeability and low resistivity will have the greatest magnetic field shielding effectiveness. However, multi-layer coatings are not excluded, in which case it is necessary to optimize the technology and improve economics. In addition, theoretical models of thin film shielding can only give correct qualitative conclusions, but they cannot give sufficiently accurate quantitative results.

[0097] In step S102, a plurality of samples are produced according to the first shielding effectiveness model, and the shielding effectiveness of the plurality of samples is tested. The first shielding effectiveness model is determined or corrected based on the first test result to obtain a second shielding effectiveness model.

[0098] In some embodiments, magnetron sputtering and vacuum deposition methods are used to prepare thin film shielding coatings because they can control the physical and mechanical parameters of the thin film shielding coatings during and after the production process, such as surface resistivity, volume resistivity, adhesion, thickness, and shielding effectiveness.

[0099] For electronic components such as polystyrene and plastics, it is crucial to provide the required conductive film parameters without heating the substrate. Since aluminum, copper, iron, nickel, etc. can undergo plasma chemical reactions and obtain their nitrides, oxides and other compounds, the structure and properties of the resulting conductive film can be further changed by controlling the process parameters. Based on this, aluminum and copper are selected as high conductive materials, and iron and nickel are selected as ferromagnetic materials.

[0100] Magnetron sputtering and vacuum deposition were used to prepare thin film shielding coatings because they can control the physical and mechanical parameters of thin film shielding coatings during and after production, such as surface resistivity, volume resistivity, adhesion, thickness, and shielding effectiveness. A list of some representative test samples of single-layer shielding coatings and their characteristics are shown in Table 2.

[0101] Table 2

[0102]

[0103] Two-layer and three-layer conductive film shielding layer samples were made using combinations of aluminum layers with iron and copper layers, as well as test samples of multi-layer shielding coatings. Multiple samples were then used to compare and analyze the optically transparent shielding layer.

[0104] Electron microscopy studies have shown that the transparent conductive film coating has a dispersed structure, the particle shape is close to spherical, and the frequency dependence of the reflection coefficient K and transmittance T of electromagnetic radiation of dispersed nickel films with different particle sizes is as follows: Figure 4 , Figure 5 As shown, Figure 4 This is the T(λ) relationship diagram of the nickel film dispersed on the glass substrate, 1-3(T) corresponds to the particle size of 1.5, 2.0, and 3.0 nm. Figure 5 R(λ) relationship of nickel film dispersed on glass substrate Figure 1 '-3'(R) corresponds to particle sizes of 1.5, 2.0, and 3.0 nm.

[0105] In step S103, the second shielding effectiveness model is tested by applying the second shielding effectiveness model to power battery electronic components, a third shielding effectiveness model is determined based on the second test result, and the electromagnetic compatibility of the power battery is tested based on the third shielding effectiveness model.

[0106] Here, the model corrected in step S102 is applied to the electronic components of the electric vehicle power battery, and then the accuracy of the model is verified through actual testing. If any problem occurs, step S101 is repeated.

[0107] Below, the embodiments of the present application will be fully described in combination with experimental data.

[0108] First, determine the effect of metal films of different materials on shielding performance. In order to test the shielding effect of multi-layer shielding coatings, two-layer and three-layer conductive film shielding layer samples were made, using a combination of aluminum layer with iron and copper layers. The test sample list of multi-layer shielding coatings and their characteristics were collected and calculated according to the experimental steps to obtain the experimental data at 25°C, as shown in Table 3.

[0109] Table 3

[0110]

[0111] In samples 2.1 to 2.5, a layer of material with high magnetic permeability (iron) is both the outer layer and the inner layer of the electromagnetic field source. Therefore, the effect of alternating the shielding layer on its effectiveness should be further studied.

[0112] Next, three samples were used for comparative analysis of the optically transparent shielding layer. The first one was a 50 μm thick copper grating obtained by vacuum deposition and photolithography on a glass substrate, with a grating period of 400 μm and a bandwidth of 200 μm; the second sample was a grating with the same geometric parameters prepared on an insulating rubber substrate; the third sample was obtained by magnetron deposition of 0.25 μm thick semi-transparent silicon oxide and 3.0 nm thick nickel film on a glass substrate. The experimental data are summarized in Table 4.

[0113] Table 4

[0114]

[0115] Then, the thin film shielding coating was prepared by magnetron sputtering and vacuum deposition, and the physical and mechanical parameters of the thin film shielding coating during and after the production process were tested, such as surface resistivity, volume resistivity, adhesion, thickness, and shielding effectiveness. The measurement results of the shielding effectiveness of the above test samples in electric and magnetic fields are shown in Tables 5 and 6.

[0116] Table 5

[0117]

[0118] Table 6

[0119]

[0120] From the analysis of the experimental data in Tables 5 and 6, it can be seen that the shielding effectiveness of the copper film is almost the same as that of the aluminum film of the same thickness. As for the steel film, due to its high resistivity, its shielding effect is significantly reduced in this frequency range. As can be seen from Table 6, sputtered copper films with a frequency of 3MHz or higher will produce sufficiently strong shielding effectiveness (over 10dB), while for continuous copper films, the frequency is about 100kHz, and the frequency ratio exceeds an order of magnitude. The reason for this difference lies in the structural characteristics of the film obtained by vacuum deposition. Electron microscopy studies have shown that the deposited film consists of fine grains, whose size depends on various factors that affect the deposition of metal on the substrate. On average, the grain size can range from units to tens of microns. During the growth of the film, the grains contact each other. However, on the contact surface, the periodicity of the metal crystal structure is broken, and potential barriers are formed between the grains, preventing the current from flowing between the grains. These results are qualitatively consistent with theoretical calculations.

[0121] In summary, the embodiments of the present application have the following beneficial effects:

[0122] (1) Improving the performance and safety of lithium-ion batteries: By accurately studying the effects of different materials and layers of metal films on shielding effectiveness, we can guide the improvement of lithium-ion batteries from a mechanism perspective, significantly improve the electromagnetic shielding effect of the battery, and thus increase its service life and safety. This is of great significance for promoting the commercial application of lithium-ion batteries.

[0123] (2) Lightweight and optimized design: Using transparent metal film as shielding material will not only not increase the weight and size of the equipment, but also can be finely processed using photolithography technology, making it easier to design and manufacture. This method helps to achieve lightweight and optimized design of power batteries and related electronic equipment, and improve their overall performance.

[0124] (3) Enhanced technology scalability: Thin-film shielding coatings are prepared through advanced manufacturing technologies such as magnetron sputtering and vacuum deposition, and accurate analytical models are constructed. These technologies and models have wide applicability. They can be applied not only to the field of lithium-ion batteries, but also to the analysis of other types of power batteries (such as solid-state batteries), providing strong support for the design and optimization of related fields.

[0125] (4) Promote the formation and application of empirical models: Through repeated experiments and model verification, empirical analysis models for metal film shielding performance can be gradually constructed. These models will become important tools for power battery design, optimization and performance evaluation, helping to improve product reliability and market competitiveness.

[0126] Based on the same inventive concept, an electromagnetic compatibility testing device for a power battery using a metal film corresponding to the electromagnetic compatibility testing method for a power battery using a metal film in the first embodiment is also provided in an embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the electromagnetic compatibility testing method for a power battery using a metal film, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0127] like Figure 6 As shown, Figure 6 : is a schematic diagram of the structure of a power battery electromagnetic compatibility test device 600 using a metal film provided in an embodiment of the present application. The power battery electromagnetic compatibility test device 600 using a metal film includes:

[0128] A construction module 601 is used to construct a first shielding effectiveness model; wherein the first shielding effectiveness model represents the influence of the number of layers of metal films of different materials on the shielding effectiveness;

[0129] An optimization module 602 is used to prepare a plurality of samples for the first shielding effectiveness model, and test the shielding effectiveness of the plurality of samples, and determine or correct the first shielding effectiveness model based on the first test result to obtain a second shielding effectiveness model;

[0130] The testing module 603 is used to test the second shielding effectiveness model by applying the second shielding effectiveness model to the electronic components of the power battery, determine the third shielding effectiveness model based on the second test result, and test the electromagnetic compatibility of the power battery based on the third shielding effectiveness model.

[0131] Those skilled in the art should understand that Figure 6 The functions of the various units in the electromagnetic compatibility testing device 600 for a power battery using a metal film can be understood by referring to the related description of the electromagnetic compatibility testing method for a power battery using a metal film. Figure 6 The functions of the various units in the power battery electromagnetic compatibility testing device 600 using a metal film as shown can be implemented by a program running on a processor, or can be implemented by a specific logic circuit.

[0132] In a possible implementation, the construction module 601 constructs a first shielding effectiveness model, including:

[0133] Construct a single-layer shielding effectiveness model;

[0134] Based on the single-layer shielding effectiveness model, an equivalent circuit of an n-layer structure, a field source and a measuring device is constructed through a metal network composed of multiple conductive layers;

[0135] The first shielding effectiveness model is determined based on the equivalent circuit.

[0136] In a possible implementation, the single-layer shielding effectiveness model is:

[0137]

[0138] Among them, k3 represents the single-layer shielding factor, L3 is the shielding inductance, R3 is the shielding impedance, and ω is the magnetic field frequency.

[0139] In a possible implementation, each of the multiple conductive layers includes an inductor L and a resistor R connected in parallel, and a magnetic field is generated by a coil L0 through which an alternating current I0 with a frequency of ω passes, and an electromotive force is induced in a receiving coil L′ in the absence of shielding;

[0140]

[0141] Among them, k is the mutual inductance coefficient of the coil, through I1...I nThe current in each shielding layer is represented by a system of n equations.

[0142]

[0143] The mutual inductance of the i-th and j-th coils is represented by L ij express.

[0144] In a possible implementation manner, the construction module 601 determines the first shielding effectiveness model based on the equivalent circuit, including:

[0145] The single-layer shielding factor is taken as the ratio of the electromotive force induced in the receiving coil without and with shielding;

[0146]

[0147] Among them, U э caused by eddy currents flowing in the shield;

[0148]

[0149] Available

[0150]

[0151] The first formula for the value of the multi-layer shielding factor is then:

[0152]

[0153] The resistance of the shielding layer and the specific volume resistance of the material making it are obtained by the first formula I Proportional to the layer thickness d i Inversely proportional, inductance is related to the magnetic permeability μ of the material. I is proportional to;

[0154] The first formula is expressed as the second formula:

[0155]

[0156] where A is a scaling factor that depends on the shield geometry;

[0157] The second formula is used as the first shielding effectiveness model.

[0158] In a possible implementation, the optimization module 602 prepares a plurality of samples for the first shielding effectiveness model, and tests the shielding effectiveness of the plurality of samples, including:

[0159] A thin film shielding coating is prepared by magnetron sputtering and / or vacuum deposition, and the thin film shielding coating is tested to obtain the characteristics of the thin film shielding coating; wherein the thin film shielding coating uses aluminum and copper as high conductive materials and iron and nickel as ferromagnetic materials, and the thin film shielding coating corresponds to a physical and mechanical parameter, and the physical and mechanical parameter includes surface resistivity, volume resistivity, adhesion, thickness and shielding effectiveness;

[0160] A plurality of 1-n layer thin film shielding coating samples of different materials are manufactured, and the samples are tested respectively to obtain first test results, wherein the first test results at least include the dispersed structure, particle shape, electromagnetic radiation reflection coefficient and frequency dependence of transmittance of the samples.

[0161] In a possible implementation, the testing module 603 further includes:

[0162] A shielding factor adapted to a target component is determined based on an electromagnetic compatibility test result of a power battery, and a target metal film is determined based on the shielding factor.

[0163] The above-mentioned power battery electromagnetic compatibility test device using metal film in the present application embodiment has the following beneficial effects:

[0164] (1) Improving the performance and safety of lithium-ion batteries: By accurately studying the effects of different materials and layers of metal films on shielding effectiveness, we can guide the improvement of lithium-ion batteries from a mechanism perspective, significantly improve the electromagnetic shielding effect of the battery, and thus increase its service life and safety. This is of great significance for promoting the commercial application of lithium-ion batteries.

[0165] (2) Lightweight and optimized design: Using transparent metal film as shielding material will not only not increase the weight and size of the equipment, but also can be finely processed using photolithography technology, making it easier to design and manufacture. This method helps to achieve lightweight and optimized design of power batteries and related electronic equipment, and improve their overall performance.

[0166] (3) Enhanced technology scalability: Thin-film shielding coatings are prepared through advanced manufacturing technologies such as magnetron sputtering and vacuum deposition, and accurate analytical models are constructed. These technologies and models have wide applicability. They can be applied not only to the field of lithium-ion batteries, but also to the analysis of other types of power batteries (such as solid-state batteries), providing strong support for the design and optimization of related fields.

[0167] (4) Promote the formation and application of empirical models: Through repeated experiments and model verification, empirical analysis models for metal film shielding performance can be gradually constructed. These models will become important tools for power battery design, optimization and performance evaluation, helping to improve product reliability and market competitiveness.

[0168] like Figure 7 As shown, Figure 7 The present invention provides a schematic diagram of the structure of an electronic device 700, wherein the electronic device 700 includes:

[0169] A processor 701, a storage medium 702 and a bus 703, wherein the storage medium 702 stores machine-readable instructions executable by the processor 701. When the electronic device 700 is running, the processor 701 communicates with the storage medium 702 via the bus 703, and the processor 701 executes the machine-readable instructions to perform the steps of the electromagnetic compatibility test method for a power battery using a metal film as described in an embodiment of the present application.

[0170] In actual application, the components in the electronic device 700 are coupled together via the bus 703. It is understood that the bus 703 is used to realize the connection and communication between these components. In addition to the data bus, the bus 703 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, Figure 7 Various buses are labeled as bus 703.

[0171] The electronic device of the present application has the following beneficial effects:

[0172] (1) Improving the performance and safety of lithium-ion batteries: By accurately studying the effects of different materials and layers of metal films on shielding effectiveness, we can guide the improvement of lithium-ion batteries from a mechanism perspective, significantly improve the electromagnetic shielding effect of the battery, and thus increase its service life and safety. This is of great significance for promoting the commercial application of lithium-ion batteries.

[0173] (2) Lightweight and optimized design: Using transparent metal film as shielding material will not only not increase the weight and size of the equipment, but also can be finely processed using photolithography technology, making it easier to design and manufacture. This method helps to achieve lightweight and optimized design of power batteries and related electronic equipment, and improve their overall performance.

[0174] (3) Enhanced technology scalability: Thin-film shielding coatings are prepared through advanced manufacturing technologies such as magnetron sputtering and vacuum deposition, and accurate analytical models are constructed. These technologies and models have wide applicability. They can be applied not only to the field of lithium-ion batteries, but also to the analysis of other types of power batteries (such as solid-state batteries), providing strong support for the design and optimization of related fields.

[0175] (4) Promote the formation and application of empirical models: Through repeated experiments and model verification, empirical analysis models for metal film shielding performance can be gradually constructed. These models will become important tools for power battery design, optimization and performance evaluation, helping to improve product reliability and market competitiveness.

[0176] The embodiment of the present application also provides a computer-readable storage medium, which stores executable instructions. When the executable instructions are executed by at least one processor 701, the electromagnetic compatibility testing method for a power battery using a metal film described in the embodiment of the present application is implemented.

[0177] In some embodiments, the storage medium can be a magnetic random access memory (FRAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, a magnetic surface storage, an optical disk, or a compact disc read-only memory (CD ROM); it can also be various devices including one or any combination of the above memories.

[0178] In some embodiments, executable instructions may be in the form of a program, software, software module, script or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine or other unit suitable for use in a computing environment.

[0179] As an example, executable instructions may, but do not necessarily, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, for example, in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (for example, files storing one or more modules, subroutines, or code portions).

[0180] By way of example, executable instructions may be deployed to be executed on one computing device, or on multiple computing devices located at one site, or on multiple computing devices distributed across multiple sites and interconnected by a communication network.

[0181] The above computer-readable storage medium in the present application embodiment has the following beneficial effects:

[0182] (1) Improving the performance and safety of lithium-ion batteries: By accurately studying the effects of different materials and layers of metal films on shielding effectiveness, we can guide the improvement of lithium-ion batteries from a mechanism perspective, significantly improve the electromagnetic shielding effect of the battery, and thus increase its service life and safety. This is of great significance for promoting the commercial application of lithium-ion batteries.

[0183] (2) Lightweight and optimized design: Using transparent metal film as shielding material will not only not increase the weight and size of the equipment, but also can be finely processed using photolithography technology, making it easier to design and manufacture. This method helps to achieve lightweight and optimized design of power batteries and related electronic equipment, and improve their overall performance.

[0184] (3) Enhanced technology scalability: Thin-film shielding coatings are prepared through advanced manufacturing technologies such as magnetron sputtering and vacuum deposition, and accurate analytical models are constructed. These technologies and models have wide applicability. They can be applied not only to the field of lithium-ion batteries, but also to the analysis of other types of power batteries (such as solid-state batteries), providing strong support for the design and optimization of related fields.

[0185] (4) Promote the formation and application of empirical models: Through repeated experiments and model verification, empirical analysis models for metal film shielding performance can be gradually constructed. These models will become important tools for power battery design, optimization and performance evaluation, helping to improve product reliability and market competitiveness.

[0186] In the several embodiments provided in the present application, it should be understood that the disclosed methods and electronic devices can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0187] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple 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.

[0188] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0189] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a platform server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0190] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for testing electromagnetic compatibility of a power battery using a metal film, characterized in that: The method comprises: Constructing a first shielding effectiveness model; wherein the first shielding effectiveness model represents the influence of the number of layers of metal films of different materials on the shielding effectiveness; Manufacturing a plurality of samples according to the first shielding effectiveness model, and testing the shielding effectiveness of the plurality of samples, and determining or correcting the first shielding effectiveness model based on the first test result to obtain a second shielding effectiveness model; The second shielding effectiveness model is tested by applying the second shielding effectiveness model to power battery electronic components, a third shielding effectiveness model is determined based on the second test result, and the electromagnetic compatibility of the power battery is tested based on the third shielding effectiveness model.

2. The method according to claim 1, characterized in that The constructing of the first shielding effectiveness model comprises: Construct a single-layer shielding effectiveness model; Based on the single-layer shielding effectiveness model, an equivalent circuit of an n-layer structure, a field source and a measuring device is constructed through a metal network composed of multiple conductive layers; The first shielding effectiveness model is determined based on the equivalent circuit.

3. The method according to claim 2, characterized in that The single-layer shielding effectiveness model is: Among them, k3 represents the single-layer shielding factor, L3 is the shielding inductance, R3 is the shielding impedance, and ω is the magnetic field frequency.

4. The method according to claim 3, characterized in that Each of the plurality of conductive layers comprises an inductor L and a resistor R connected in parallel, and a magnetic field is generated by a coil L0 through which an alternating current I0 with a frequency of ω passes, and an electromotive force is induced in a receiving coil L′ in the absence of shielding; Among them, k is the mutual inductance coefficient of the coil, through I1...I n The current in each shielding layer is represented by a system of n equations. The mutual inductance of the i-th and j-th coils is represented by L ij express.

5. The method according to claim 4, characterized in that The determining the first shielding effectiveness model based on the equivalent circuit comprises: The single-layer shielding factor is taken as the ratio of the electromotive force induced in the receiving coil without and with shielding; Among them, U э caused by eddy currents flowing in the shield; Available The first formula for the value of the multi-layer shielding factor is then: The resistance of the shielding layer and the specific volume resistance of the material making it are obtained by the first formula I Proportional to the layer thickness d i Inversely proportional, inductance is related to the magnetic permeability μ of the material. I is proportional to; The first formula is expressed as the second formula: where A is a scaling factor that depends on the shield geometry; The second formula is used as the first shielding effectiveness model.

6. The method according to claim 1, characterized in that The method of manufacturing a plurality of samples according to the first shielding effectiveness model and testing the shielding effectiveness of the plurality of samples comprises: A thin film shielding coating is prepared by magnetron sputtering and / or vacuum deposition, and the thin film shielding coating is tested to obtain the characteristics of the thin film shielding coating; wherein the thin film shielding coating uses aluminum and copper as high conductive materials and iron and nickel as ferromagnetic materials, and the thin film shielding coating corresponds to a physical and mechanical parameter, and the physical and mechanical parameter includes surface resistivity, volume resistivity, adhesion, thickness and shielding effectiveness; A plurality of 1-n layer thin film shielding coating samples of different materials are manufactured, and the samples are tested respectively to obtain first test results, wherein the first test results at least include the dispersed structure, particle shape, electromagnetic radiation reflection coefficient and frequency dependence of transmittance of the samples.

7. The method according to claim 1, characterized in that The method further comprises: A shielding factor adapted to a target component is determined based on an electromagnetic compatibility test result of a power battery, and a target metal film is determined based on the shielding factor.

8. A power battery electromagnetic compatibility test device using a metal film, characterized in that: The device comprises: A construction module, used to construct a first shielding effectiveness model; wherein the first shielding effectiveness model characterizes the influence of the number of layers of metal films of different materials on the shielding effectiveness; an optimization module, configured to prepare a plurality of samples for the first shielding effectiveness model, test the shielding effectiveness of the plurality of samples, determine or correct the first shielding effectiveness model based on the first test result, and obtain a second shielding effectiveness model; A testing module is used to test the second shielding effectiveness model by applying the second shielding effectiveness model to the electronic components of the power battery, determine a third shielding effectiveness model based on the second test result, and test the electromagnetic compatibility of the power battery based on the third shielding effectiveness model.

9. An electronic device, characterized in that: include: A processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the electromagnetic compatibility test method for a power battery using a metal film as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the electromagnetic compatibility testing method for a power battery using a metal film as claimed in any one of claims 1 to 7 is executed.

Images