Modeling methods, apparatuses, devices, media, and products for solid-state battery conductive agents

Abstract

The application relates to a modeling method, device, equipment, medium and product of a solid-state battery conductive agent. The method comprises the following steps: constructing a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle, wherein the positive active particle is not in contact with the positive current collector, and the negative active particle is not in contact with the negative current collector; constructing a first resistance between the first circuit node and the positive current collector, and constructing a second resistance between the second circuit node and the negative current collector; and determining a circuit model of the solid-state battery conductive agent based on the first circuit node, the second circuit node, the first resistance and the second resistance. The method can reduce the required computing resources for modeling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid-state battery modeling, in particular to a modeling method and device for a solid-state battery conductive agent, a computer device, a computer readable storage medium and a computer program product. BACKGROUND

[0002] Compared with traditional liquid lithium-ion batteries, solid-state batteries have the advantages of high safety, high energy density, wide working temperature range, etc. However, the development of solid-state batteries requires a large number of experimental verifications. Simulation technology can quickly simulate the performance and behavior of the battery in a virtual environment, reduce the number of experiments, reduce the development cost, and shorten the development cycle.

[0003] As a key component in a solid-state battery, the conductive agent, together with the active material particles, forms an electron conductive network. Typical conductive agents, such as carbon black and carbon nanotubes, have a size of 10-100 nm, and the size of active particles and solid electrolyte is 1 um-10 um. The size of the electrode sheet containing the positive electrode, negative electrode and separator is about 100 um.

[0004] In related technologies, when modeling a solid-state battery, a large number of small-size conductive agent models need to be constructed on the surface of the particles, resulting in a large amount of computing resources required for modeling. SUMMARY

[0005] Therefore, it is necessary to provide a modeling method, device, equipment, medium and product for a solid-state battery conductive agent, which can reduce the computing resources required for modeling.

[0006] In a first aspect, the present application provides a modeling method for a solid-state battery conductive agent, comprising:

[0007] constructing a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle, wherein the positive active particles are not in contact with the positive current collector, and the negative active particles are not in contact with the negative current collector;

[0008] constructing a first resistor between the first circuit node and the positive current collector, and a second resistor between the second circuit node and the negative current collector;

[0009] determining a circuit model of the solid-state battery conductive agent based on the first circuit node, the second circuit node, the first resistor and the second resistor.

[0010] In one of the embodiments, the constructing the first circuit node corresponding to the center of each positive active particle and the second circuit node corresponding to the center of each negative active particle comprises: constructing a first virtual contact pair between the positive active particle and the positive current collector and a second virtual contact pair between the negative active particle and the negative current collector; determining the center of the positive active particle as a first contact position of the first virtual contact pair and determining the center of the negative active particle as a second contact position of the second virtual contact pair; constructing the first circuit node according to the first contact position and constructing the second circuit node according to the second contact position.

[0011] In one of the embodiments, the constructing the first resistance between the first circuit node and the positive current collector comprises: determining a first distance between the center of the positive active particle and the positive current collector; determining a resistance value of the first resistance based on a preset resistivity, the first distance and a radius of the positive active particle; and constructing the first resistance between the first circuit node and the positive current collector according to the resistance value of the first resistance.

[0012] In one of the embodiments, the constructing the second resistance between the second circuit node and the negative current collector comprises: determining a second distance between the center of the negative active particle and the negative current collector; determining a resistance value of the second resistance based on a preset resistivity, the second distance and a radius of the negative active particle; and constructing the second resistance between the second circuit node and the negative current collector according to the resistance value of the second resistance.

[0013] In one of the embodiments, the determining the circuit model of the solid-state battery conductive agent based on the first circuit node, the second circuit node, the first resistance and the second resistance comprises: constructing a circuit node set of each particle in the solid-state battery according to a contact relationship between the particles in the solid-state battery; adding the first circuit node and the second circuit node to the circuit node set to obtain a new circuit node set; constructing a third resistance between any two circuit nodes of the new circuit node set corresponding to each particle; and determining the circuit model of the solid-state battery conductive agent according to the first resistance, the second resistance and the third resistance.

[0014] In one of the embodiments, the constructing the circuit node set of each particle in the solid-state battery according to the contact relationship between the particles in the solid-state battery comprises: determining a corresponding relationship between two particles in mutual contact in the solid-state battery to obtain a plurality of contact pairs; constructing two third circuit nodes for each contact pair and adding the two third circuit nodes to the circuit node set of the corresponding particles respectively.

[0015] In a second aspect, the application further provides a modeling device of a solid-state battery conductive agent, comprising:

[0016] A first constructing module is configured to construct a first circuit node corresponding to a center of each positive active particle, and a second circuit node corresponding to a center of each negative active particle, wherein the positive active particle is not in contact with a positive current collector, and the negative active particle is not in contact with a negative current collector;

[0017] A second constructing module is configured to construct a first resistance between the first circuit node and the positive current collector, and construct a second resistance between the second circuit node and the negative current collector;

[0018] A determining module is configured to determine a circuit model of the solid-state battery conductive agent based on the first circuit node, the second circuit node, the first resistance and the second resistance.

[0019] In a third aspect, the present application further provides a computer device, including a memory and a processor, the memory stores a computer program, and the processor implements the method in the first aspect when executing the computer program.

[0020] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method in the first aspect.

[0021] In a fifth aspect, the present application further provides a computer program product, including a computer program, and the computer program is executed by a processor to implement the method in the first aspect.

[0022] The modeling method, device, equipment, medium and product of the solid-state battery conductive agent construct a first circuit node corresponding to a center of each positive active particle, and a second circuit node corresponding to a center of each negative active particle, construct a first resistance between the first circuit node and the positive current collector, and construct a second resistance between the second circuit node and the negative current collector, and finally determine a circuit model of the solid-state battery conductive agent based on all circuit nodes and all resistances. The embodiments of the present application construct a resistance between the isolated particles and the corresponding current collector, so as to reflect the overall effect of the conductive agent through the resistance, and the electronic conduction effect of the conductive agent is homogenized. The calculation amount mainly lies in the number of active particles not in contact with the current collector, which is much less than the number of conductive agent particles. Therefore, the calculation amount is greatly reduced, the calculation resources required for modeling are reduced, the calculation cost is reduced, and the practical application is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an application environment diagram of a modeling method for the conductive agent in a solid-state battery in one embodiment;

[0025] Figure 2 This is a flowchart illustrating a modeling method for a solid-state battery conductive agent in one embodiment.

[0026] Figure 3 for Figure 2 A flowchart illustrating step 201;

[0027] Figure 4 for Figure 2 A partial flowchart of step 202;

[0028] Figure 5 for Figure 2 Another part of the process diagram for step 202;

[0029] Figure 6 for Figure 2 A flowchart illustrating step 203;

[0030] Figure 7 This is a flowchart illustrating a modeling method for solid-state batteries in one embodiment.

[0031] Figure 8 A schematic diagram of a solid-state battery composed of 7 particles;

[0032] Figure 9 When the conductive agent is not considered Figure 8 Equivalent circuit model of solid-state batteries;

[0033] Figure 10 When considering conductive agents Figure 8 Equivalent circuit model of solid-state batteries;

[0034] Figure 11 for Figure 8 A schematic diagram of the charge and discharge simulation results of a solid-state battery;

[0035] Figure 12 This is a structural block diagram of a modeling device for a solid-state battery conductive agent in one embodiment;

[0036] Figure 13 This is an internal structural diagram of a computer device in one embodiment. DETAILED DESCRIPTION

[0037] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0038] It should be noted that the terms "first", "second" and the like used in the present application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "include" and "have" and any variations thereof used in the present application are intended to cover non-exclusive inclusion. The term "multiple" used in the present application refers to two and more. The term "and / or" used in the present application refers to one of the options or any combination of multiple options.

[0039] In the related art, when modeling the conductive agent, the conductive agent particles need to be explicitly modeled, that is, small particles are generated on the surface of each particle of the solid-state battery to conduct the conductive agent, and the geometry of each conductive agent particle needs to be created one by one. Therefore, a large number of small-size conductive agent particles need to be constructed in the simulation of the actual electrode sheet scale. The number of conductive agent particles is large and irregular. Therefore, modeling the conductive agent as a discrete particle leads to a large amount of required computing resources and high computing cost, which is difficult to use in practice.

[0040] Therefore, the embodiment of the present application proposes a modeling method of a solid-state battery conductive agent, which can reduce the computing resources required for modeling the conductive agent.

[0041] The modeling method of the solid-state battery conductive agent provided by the embodiment of the present application can be applied to the application environment as shown in the figure. Figure 1 The terminal 102 communicates with the server 104 through the network. The data storage system can store the data required to be processed by the server 104. The data storage system can be integrated on the server 104, or placed on the cloud or other network servers. The terminal 102 can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, unmanned aerial vehicles, low-altitude aircraft, Internet of Things devices and portable wearable devices. The Internet of Things device can be a smart speaker, a smart television, a smart air conditioner, a smart vehicle device, a projection device, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. The server 104 can be a standalone physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0042] In one exemplary embodiment, as shown in Figure 2 a modeling method of a solid-state battery conductive agent is provided, and the method is applied to the server 104 in Figure 1 for example, including the following steps 201 to 203. Among them:

[0043] Step 201, constructing a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle. Among them, the positive active particles are not in contact with the positive current collector, and the negative active particles are not in contact with the negative current collector.

[0044] Among them, the first circuit node refers to the circuit node corresponding to the center of the positive active particle which is not in contact with the positive current collector of the solid-state battery. The second circuit node refers to the circuit node corresponding to the center of the negative active particle which is not in contact with the negative current collector of the solid-state battery. The number of first and second circuit nodes is multiple respectively.

[0045] Exemplarily, the positions of all positive active particles and the positions of all negative active particles, and the positions of the positive current collector and the negative current collector can be obtained, wherein the position refers to the position in the solid-state battery, which can be represented by coordinates. Then, a plurality of positive active particles A which are not in contact with the boundary of the positive current collector are determined according to the positions of the positive active particles and the position of the positive current collector, and a first circuit node corresponding to the center of the positive active particle A is constructed. At the same time, a plurality of negative active particles B which are not in contact with the boundary of the negative current collector are determined according to the positions of the negative active particles and the position of the negative current collector, and a second circuit node corresponding to the center of the negative active particle B is constructed.

[0046] Step 202, constructing a first resistance between the first circuit node and the positive current collector, and constructing a second resistance between the second circuit node and the negative current collector.

[0047] In this embodiment, the electronic conduction effect of the conductive agent is homogenized under the assumption that the conductive agent is uniformly dispersed.

[0048] Exemplarily, after defining the center of each positive active particle A as a first circuit node, determining the effective resistivity of the conductive agent network according to the effect or performance of the conductive agent, and determining the distance between the center of the particle A and the positive current collector, a first resistance is constructed between each first circuit node and the positive current collector according to the effective resistivity and the distance. Similarly, after defining the center of each negative active particle B as a second circuit node, determining the effective resistivity of the conductive agent network according to the effect or performance of the conductive agent, and determining the distance between the center of the particle B and the negative current collector, a second resistance is constructed between each second circuit node and the negative current collector according to the effective resistivity and the distance. Thus, a plurality of first resistances and second resistances are obtained as equivalent resistances, and a virtual circuit channel is established between each particle A and the positive current collector, and a virtual circuit channel is established between each particle B and the negative current collector.

[0049] The embodiment assumes that there is a conductive agent between each isolated particle (particle A and particle B) and the corresponding current collector, and the first resistance and the second resistance are equivalent resistances of the conductive agent.

[0050] In step 203, a circuit model of the conductive agent of the solid-state battery is determined based on the first circuit node, the second circuit node, the first resistance, and the second resistance.

[0051] Exemplarily, after obtaining a plurality of first circuit nodes and second circuit nodes, a third resistance is constructed again according to all the circuit nodes, and a circuit model equivalent to the conductive agent of the solid-state battery is determined according to the third resistance, the first resistance, and the second resistance.

[0052] In the modeling method of the conductive agent of the solid-state battery, a first circuit node corresponding to the center of each positive active particle and a second circuit node corresponding to the center of each negative active particle are constructed, a first resistance is constructed between the first circuit node and the positive current collector, and a second resistance is constructed between the second circuit node and the negative current collector, and finally a circuit model of the conductive agent of the solid-state battery is determined based on all the circuit nodes and all the resistances. The embodiment constructs a resistance between the isolated particle and the corresponding current collector to reflect the overall effect of the conductive agent through the resistance, and homogenizes the electronic conduction effect of the conductive agent. The calculation amount mainly lies in the number of active particles that are not in contact with the current collector, which is much less than the number of conductive agent particles. Therefore, the calculation amount is greatly reduced, and the calculation resources required for modeling are reduced, and the calculation cost is reduced, thereby facilitating practical application.

[0053] In an exemplary embodiment, as shown in Figure 3 Step 201 includes steps 301 to 303. Among them:

[0054] Step 301, constructing a first virtual contact pair between the positive active particles and the positive current collector, and a second virtual contact pair between the negative active particles and the negative current collector.

[0055] Wherein, the virtual contact pair refers to the contact relationship between the isolated particles and the corresponding current collector. Since it is actually not in contact, this embodiment assumes that it is in contact, so the corresponding relationship between them is set as a virtual contact pair. The first and second virtual contact pairs respectively represent the contact pairs corresponding to the positive and negative electrodes.

[0056] Step 302, determining the center of the positive active particles as the first contact position of the first virtual contact pair, and determining the center of the negative active particles as the second contact position of the second virtual contact pair.

[0057] The first and second contact positions refer to the contact positions of the contact pair objects corresponding to the virtual contact pairs.

[0058] Step 303, constructing a first circuit node according to the first contact position, and constructing a second circuit node according to the second contact position.

[0059] Exemplarily, a virtual mathematically equivalent connection is created between the isolated positive active particles A and the positive current collector, and a virtual mathematically equivalent connection is created between the isolated negative active particles B and the negative current collector. This virtual connection is set as a connection between the center point of the isolated particles and the boundary of the corresponding current collector, i.e. the contact position is set as the center point (such as the center of a sphere) of the isolated particles. Then, the corresponding isolated particles are defined as a circuit node according to the contact positions of the virtual contact pairs. Finally, resistances are constructed between the circuit nodes and the corresponding current collectors to quantify the paths of electron transport through the virtual contact.

[0060] For example, assuming that there is no particle A1 in contact with the positive current collector, a first resistance is constructed between the particle A1 and the positive current collector, and the resistance value of the first resistance is determined based on the distance between the contact position and the boundary of the current collector and the equivalent resistivity of the conductive agent, wherein the equivalent resistivity can be set in advance based on the performance and proportion of the conductive agent.

[0061] Thus, this example constructs virtual contact pairs, sets contact positions, constructs resistances corresponding to the virtual contact pairs, and realizes virtual contact through resistances, greatly simplifying the electron transport path and reducing the computational cost.

[0062] Then, step 202 is performed, i.e., the first resistance and the second resistance are constructed. The first resistance and the second resistance can be constructed based on a preset resistivity and a distance between the active particles and the corresponding current collector. The preset resistivity is used to represent the equivalent resistivity of the conductive agent between the positive or negative active particles and the corresponding current collector. The preset resistivity includes a contact resistivity and a bulk resistivity. The contact resistivity and the bulk resistivity can be user input parameters, which are the properties of the homogenized conductive agent, and reflect the performance and proportion of the conductive agent in the electrode formula. For example, using an additive with higher conductivity or adding more proportion of the conductive agent corresponds to smaller contact resistivity and bulk resistivity. The construction method of the resistance is described in detail below.

[0063] In one exemplary embodiment, as shown in FIG. 4, Figure 4 step 202 includes steps 401 to 403.

[0064] Step 401: determining a first distance between the center of the positive active particle and the positive current collector.

[0065] Step 402: determining the resistance value of the first resistance based on the preset resistivity, the first distance, and the radius of the positive active particle.

[0066] Step 403: constructing the first resistance between the first circuit node and the positive current collector according to the resistance value of the first resistance.

[0067] Exemplarily, the preset resistivity, the first distance, and the radius of the positive active particle A are used to calculate the electronic resistance from the center of the positive active particle A to the positive current collector according to a preset calculation rule, i.e., the resistance value of the first resistance, and the calculation formula is as follows:

[0068] .

[0069] wherein, R1 is the resistance value of the first resistance from the positive active particle not in contact with the positive current collector to the positive current collector, is the contact resistivity between the positive active particle not in contact with the positive current collector and the positive current collector, with the unit of Ω·m 2 , r1 is the radius of the positive active particle not in contact with the positive current collector, with the unit of m, and L1 is the first distance between the positive active particle not in contact with the positive current collector and the positive current collector, with the unit of m, is the bulk resistivity between the contact resistivity . , is the bulk resistivity between the positive active particle not in contact with the positive current collector and the positive current collector.

[0070] In one exemplary embodiment, as shown in FIG. 4,Figure 5 As shown, step 202 further includes steps 501 to 503. Among them:

[0071] Step 501, determine the second distance between the center of the negative active particle and the negative current collector.

[0072] Step 502, based on the preset resistivity, the second distance and the radius of the negative active particle, determine the resistance value of the second resistance.

[0073] Step 503, according to the resistance value of the second resistance, construct the second resistance between the second circuit node and the negative current collector.

[0074] Exemplarily, the preset resistivity, the second distance and the radius of the negative active particle B are calculated according to the preset calculation rule to calculate the electronic resistance from the center of the negative active particle B to the negative current collector, that is, the resistance value of the second resistance, and the calculation formula is:

[0075] .

[0076] Among them, is the resistance value of the second resistance from the negative active particle without contact with the negative current collector to the negative current collector, is the contact resistivity between the negative active particle without contact with the negative current collector and the negative current collector, unit: Ω·m 2 , r2 is the radius of the negative active particle without contact with the negative current collector, unit: m, L2 is the first distance between the negative active particle without contact with the negative current collector and the negative current collector, unit: m, is the bulk resistivity and the contact resistivity between them, unit: , is the bulk resistivity between the negative active particle without contact with the negative current collector and the negative current collector.

[0077] Thus, the present example constructs the resistance between the isolated particle and the corresponding current collector according to the distance, the radius and the preset resistivity, so as to quantify the electronic resistance between the particle and the current collector.

[0078] The first resistance and the second resistance are constructed by the above steps, that is, the creation of the core component in the conductive agent modeling process is completed, and then step 203 is executed, that is, the circuit model of the solid-state battery conductive agent is determined based on the first circuit node, the second circuit node, the first resistance and the second resistance.

[0079] In one exemplary embodiment, as shown in Figure 6 , step 203 includes steps 601 to 604:

[0080] Step 601, constructing a circuit node set of each particle in the solid-state battery according to the contact relationship between the particles in the solid-state battery.

[0081] Further, the step can include determining the correspondence between two particles in contact with each other in the solid-state battery to obtain a plurality of contact pairs; and constructing two third circuit nodes for each contact pair and adding the two third circuit nodes to the circuit node set of the corresponding particles, respectively.

[0082] Wherein, the particles in the solid-state battery include active particles (including the above-mentioned positive active particles and negative active particles) and solid-state electrolyte particles. The third circuit node refers to the circuit node of the active particle and the solid-state electrolyte particle, wherein each particle corresponds to at least one third circuit node. In a possible implementation, a fourth resistance with a preset resistance value can be constructed between the third circuit nodes corresponding to two particles in contact with each other.

[0083] Illustratively, the positions of the active particles and the solid-state electrolyte particles in the solid-state battery and the isolation radius are obtained first, and whether there is a contact relationship between the particles is determined based on the positions and the radius, and two particles in contact with each other are determined as a contact pair, i.e., the contact pair defines the contact of the two particles. The contact pairs are divided into four categories, each category containing a plurality of contact pairs:

[0084] The contact pair AM-AM of the active material particle AM and the active material particle AM;

[0085] The contact pair AM-SE of the active material particle AM and the solid-state electrolyte particle SE;

[0086] The contact pair AM-CC of the active particle AM and the current collector CC;

[0087] The contact pair SE-SE of the solid-state electrolyte particle SE and the solid-state electrolyte particle SE.

[0088] Then, for each contact pair, two corresponding third circuit nodes are constructed. The circuit node set of each particle is defined. All third circuit nodes are added to the circuit node set of the corresponding particle to obtain the circuit node set of each particle, which includes the third circuit nodes. For example, two third circuit nodes (ij_x, ij_y) are created for each contact pair (i,j), where (i,j) represents the contact pair of particles x and y, x represents particle x, and y represents particle y in contact with particle x. The node ij_x is placed in the circuit node set corresponding to particle x, and the node ij_y is placed in the circuit node set corresponding to particle y, respectively obtaining the circuit node set of particles x and y.

[0089] After constructing the circuit node set, a fourth resistance with a preset resistance value can also be constructed between the third circuit nodes corresponding to two particles in contact with each other:

[0090] If the contact pair belongs to any one of AM-AM, AM-CC or SE-SE, a contact resistance Rc= p 面 / A is created between the circuit nodes (ij_x, ij_y), where p 面 is the surface resistivity between particle x and particle y, and A is the contact area between particle x and particle y.

[0091] If the contact pair belongs to AM-SE, a reaction resistance Rbv is created between the circuit nodes (ij_x, ij_y), and the volt-ampere characteristic of Rbv is defined by the Butler-Volmer equation containing the film resistance.

[0092] Step 602, add the first circuit node and the second circuit node to the circuit node set to obtain a new circuit node set.

[0093] Specifically, after obtaining the circuit node set corresponding to each particle of the solid-state battery (including the third circuit node), the first circuit node and the second circuit node constructed in step 201 are added to the circuit node set corresponding to the particle to obtain a new circuit node set, that is, the new circuit node set of each particle includes the third circuit node and the first circuit node or the second circuit node. For example, the new circuit node set of the positive active particle A1 includes the third circuit node and the first circuit node, and the new circuit node set of the negative active particle B1 includes the third circuit node and the second circuit node.

[0094] Step 603, for each particle corresponding to the new circuit node set, construct a third resistance between any two circuit nodes.

[0095] Exemplarily, the third resistance is constructed between any two third circuit nodes, between the first circuit nodes, and between the first and third circuit nodes corresponding to each positive active particle, and the third resistance can be a bulk resistance. The resistance value of the third resistance can be determined according to the bulk conductivity, the distance, and the particle radius between the corresponding two particles.

[0096] Step 604, determine the circuit model of the conductive agent of the solid-state battery according to the first resistance, the second resistance, and the third resistance.

[0097] Exemplarily, the circuit model of the conductive agent is obtained according to the first resistance, the second resistance, and the third resistance constructed corresponding to the virtual contact pair.

[0098] Optionally, the equivalent circuit model of the solid-state battery can also be determined according to the first to fourth resistances.

[0099] The following takes the solid-state battery modeling method comprising the solid-state battery modeling method as an example to illustrate the construction method of the solid-state battery circuit model:

[0100] As shown in Figure 7 The solid-state battery modeling method based on the conductive agent modeling includes the following steps:

[0101] Step 701, obtaining the position and radius of the active particles and solid electrolyte particles in the solid-state battery;

[0102] Step 702, determining the contact pair between two particles in contact according to the position and radius;

[0103] Step 703, defining the circuit node set corresponding to each particle, and constructing two third circuit nodes for each contact pair, and adding the two third circuit nodes to the circuit node set of the corresponding particles respectively;

[0104] Step 704, constructing a fourth resistance between the third circuit nodes corresponding to the two particles in contact;

[0105] Step 705, constructing a first virtual contact pair between each active particle A of the positive electrode and the positive electrode current collector which is not in contact, and a second virtual contact pair between each active particle B of the negative electrode and the negative electrode current collector which is not in contact;

[0106] Step 706, taking the center of the particle A and the particle B as the contact position of the virtual contact pair;

[0107] Step 707, constructing a first circuit node corresponding to the center of the particle A and a second circuit node corresponding to the center of the particle B according to the contact position;

[0108] Step 708, constructing a first resistance between the first circuit node and the positive electrode current collector, and a second resistance between the second circuit node and the negative electrode current collector based on the preset resistivity, the radius of the active particle, and the distance between the active particle and the corresponding current collector;

[0109] Step 709, adding the first circuit node and the second circuit node to the circuit node set to obtain a new circuit node set;

[0110] Step 710, for each particle corresponding to the new circuit node set, constructing a third resistance between any two circuit nodes;

[0111] Step 711, determining the circuit model of the conductive agent of the solid-state battery according to the first resistance, the second resistance, the third resistance and the fourth resistance.

[0112] By the above steps to complete the modeling of solid-state battery, before simulation, the following boundary conditions can be set: the negative electrode current collector is grounded, and the positive electrode current collector creates a constant current, constant voltage or constant power load. Then according to the created circuit, the simulation of the solid-state battery is carried out without boundary conditions.

[0113] Figures 8 to 11 The algorithm results of the present embodiment are shown. Figure 8 In the solid-state battery composed of 7 particles, the schematic diagram ignores the conductive agent. Figure 8 In the solid-state battery composed of 7 particles, the schematic diagram ignores the conductive agent.

[0114] Figure 9 The equivalent circuit model of the solid-state battery without considering the conductive agent is Figure 10 The equivalent circuit model of the solid-state battery considering the conductive agent is Figure 9 It can be seen that in the equivalent circuit of the model without conductive agent, the positive active particle d corresponds to three resistances: the bulk resistance Rdd10, the electrochemical reaction resistance Bde5 and Bdi7, and the negative active particle g corresponds to three resistances: the bulk resistance Rgg13, the electrochemical reaction resistance Bgh4 and Bgi8. Figure 10 In the equivalent circuit of the model without conductive agent, the other resistances: Rff12, Bfh3 and Rbf2f are all three resistances corresponding to the negative active particle f; Rac1, Rcc9 and Rce6 are all three resistances corresponding to the positive active particle c, and Rhh4 and Bgh4, Rii5, Ree11 and Bce6 are resistances corresponding to the particles h, i and e. Figure 10 It can be seen that after considering the effect of the conductive agent, the positive active particle d adds one resistance Rad9 to the positive electrode current collector, and the bulk resistance increases to three: Rdd12, Rdd13 and Rdd14, and the electrochemical reaction resistance remains unchanged as Bde5 and Bdi7. The negative active particle g adds one resistance Rbg10 to the negative electrode current collector, and the bulk resistance increases to three: Rdd17, Rdd18 and Rdd19, and the electrochemical reaction resistance remains unchanged as Bgh4 and Bgi8.

[0115] Figure 11 The simulation results of the battery in Figure 8 at the rate of Figure 9 and Figure 10 The curve of voltage increase is the charging curve, and the curve of voltage decrease is the discharging curve. It can be seen that when the conductive agent is not considered, the positive active particle d and the positive active particle g cannot contribute to the effective capacity due to the lack of electron channels to the current collector, and their charging and discharging capacity is less than that of the model considering the conductive agent. The charging and discharging results of the model considering the conductive agent are more in line with the actual situation.

[0116] In summary, the embodiments of the present application assume that the conductive agent is uniformly dispersed, and the electronic conduction effect of the conductive agent is homogenized. In this way, the computational cost is greatly reduced, and it is possible to simulate the actual size of the solid-state battery electrode.

[0117] It should be understood that, although each step in the flowchart involved in each of the above-described embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least some of the steps in the flowchart involved in each of the above-described embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least some of the other steps or steps or stages in other steps. It can be understood that the steps in different embodiments can be freely combined as needed, and various non-contradictory schemes formed by the combination are within the scope of protection of the present application.

[0118] Based on the same inventive concept, the embodiments of the present application also provide a solid-state battery conductive agent modeling device for implementing the above-mentioned solid-state battery conductive agent modeling method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more solid-state battery conductive agent modeling device embodiments provided below can refer to the limitations of the solid-state battery conductive agent modeling method described above, and will not be repeated here.

[0119] In one exemplary embodiment, as shown in Figure 12 A solid-state battery conductive agent modeling device is provided, comprising: a first construction module 1201, a second construction module 1202, and a determination module 1203, wherein:

[0120] The first construction module 1201 is configured to construct a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle, wherein the positive active particle is not in contact with the positive current collector, and the negative active particle is not in contact with the negative current collector;

[0121] The second construction module 1202 is configured to construct a first resistance between the first circuit node and the positive current collector, and a second resistance between the second circuit node and the negative current collector;

[0122] The determining module 1203 is configured to determine a circuit model of the conductive agent of the solid-state battery based on the first circuit node, the second circuit node, the first resistance, and the second resistance.

[0123] In one embodiment, the first constructing module 1201 includes a first constructing unit, a first determining unit, and a second constructing unit, where: the first constructing unit is configured to construct a first virtual contact pair between the positive active particle and the positive current collector, and a second virtual contact pair between the negative active particle and the negative current collector; the first determining unit is configured to determine a center of the positive active particle as a first contact position of the first virtual contact pair, and determine a center of the negative active particle as a second contact position of the second virtual contact pair; and the second constructing unit is configured to construct the first circuit node according to the first contact position, and construct the second circuit node according to the second contact position.

[0124] In one embodiment, the second constructing module 1202 is specifically configured to: determine a first distance between the center of the positive active particle and the positive current collector; determine a resistance value of the first resistance based on a preset resistivity, the first distance, and a radius of the positive active particle; and construct the first resistance between the first circuit node and the positive current collector according to the resistance value of the first resistance.

[0125] In one embodiment, the second constructing module 1202 is specifically further configured to: determine a second distance between the center of the negative active particle and the negative current collector; determine a resistance value of the second resistance based on the preset resistivity, the second distance, and a radius of the negative active particle; and construct the second resistance between the second circuit node and the negative current collector according to the resistance value of the second resistance.

[0126] In one embodiment, the determining module 1203 includes a third constructing unit, an adding unit, a fourth constructing unit, and a second determining unit, where: the third constructing unit is configured to construct a circuit node set of each particle in the solid-state battery according to a contact relationship between the particles in the solid-state battery; the adding unit is configured to add the first circuit node and the second circuit node to the circuit node set to obtain a new circuit node set; the fourth constructing unit is configured to construct a third resistance between any two circuit nodes in the new circuit node set corresponding to each particle; and the second determining unit is configured to determine a circuit model of the conductive agent of the solid-state battery according to the first resistance, the second resistance, and the third resistance.

[0127] The second determining unit is configured to determine a circuit model of the conductive agent of the solid-state battery according to the first resistance, the second resistance, and the third resistance.

[0128] Further, the third constructing unit is specifically configured to: determine a correspondence between two particles in contact with each other in the solid-state battery, to obtain a plurality of contact pairs; and construct two third circuit nodes for each contact pair, and add the two third circuit nodes to the circuit node set of the corresponding particles respectively.

[0129] The above-mentioned modules in the modeling device of the solid-state battery conductive agent can be implemented by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules.

[0130] In an exemplary embodiment, a computer device is provided, which can be a server, and an internal structure diagram thereof can be as shown in Figure 13 The computer device includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the computer device is configured to store modeling data of the conductive agent. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to communicate with external terminals through a network connection. The computer program is executed by the processor to implement a modeling method of a solid-state battery conductive agent.

[0131] Those skilled in the art can understand that Figure 13 The structure shown in the above-mentioned figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. Specifically, the computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0132] In an exemplary embodiment, a computer device is provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the modeling method of the solid-state battery conductive agent proposed in the above-mentioned embodiments.

[0133] In an embodiment, a computer readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the modeling method of the solid-state battery conductive agent proposed in the above-mentioned embodiments.

[0134] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the modeling method of the solid-state battery conductive agent proposed in the above embodiment.

[0135] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiments. In the embodiments provided in the present application, any reference to a memory, a database or other medium can include at least one of a non-volatile memory and a volatile memory. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, and the like, but is not limited thereto. The processor involved in the embodiments provided in the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, and the like, but is not limited thereto.

[0136] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0137] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for a person of ordinary skill in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method of modeling a solid-state battery conductive agent, the method comprising: The method comprises: constructing a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle, wherein the positive active particle is not in contact with the positive current collector, and the negative active particle is not in contact with the negative current collector; constructing a first resistance between the first circuit node and the positive current collector, and a second resistance between the second circuit node and the negative current collector; determining a circuit model of the solid-state battery conductive agent based on the first circuit node, the second circuit node, the first resistance and the second resistance, constructing a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle, comprises: constructing a first virtual contact pair between the positive active particle and the positive current collector, and a second virtual contact pair between the negative active particle and the negative current collector; determining the center of the positive active particle as a first contact position of the first virtual contact pair, and determining the center of the negative active particle as a second contact position of the second virtual contact pair; constructing the first circuit node according to the first contact position, and constructing the second circuit node according to the second contact position.

2. The method of claim 1, wherein, The method comprises: determining a first distance between the center of the positive active particle and the positive current collector; determining a resistance value of the first resistance based on a preset resistivity, the first distance and the radius of the positive active particle; constructing the first resistance between the first circuit node and the positive current collector according to the resistance value of the first resistance.

3. The method of claim 2, wherein, The preset resistivity comprises a contact resistivity between the positive active particle and the positive current collector, and a bulk resistivity between the positive active particle and the positive current collector.

4. The method of claim 1, wherein, The method comprises: determining a second distance between the center of the negative active particle and the negative current collector; determining a resistance value of the second resistance based on a preset resistivity, the second distance and the radius of the negative active particle; constructing the second resistance between the second circuit node and the negative current collector according to the resistance value of the second resistance.

5. The method according to any one of claims 1 to 4, characterized in that, The method comprises: constructing a set of circuit nodes of each particle in the solid-state battery according to the contact relationship between the particles in the solid-state battery; adding the first circuit node and the second circuit node to the set of circuit nodes to obtain a new set of circuit nodes; constructing a third resistance between any two circuit nodes in the new set of circuit nodes corresponding to each particle; determining a circuit model of the solid-state battery conductive agent according to the first resistance, the second resistance and the third resistance.

6. The method of claim 5, wherein, The method comprises: determining a corresponding relationship between two particles in contact with each other in the solid-state battery to obtain a plurality of contact pairs; construct two third circuit nodes for each contact pair, and add the two third circuit nodes into the circuit node set of the corresponding particle respectively.

7. A modeling device for a solid-state battery conductive agent, characterized by, The device comprises: a first constructing module, configured to construct a first circuit node corresponding to the center of each positive active particle, and a second circuit node corresponding to the center of each negative active particle, wherein the positive active particle is not in contact with the positive current collector, and the negative active particle is not in contact with the negative current collector; a second constructing module, configured to construct a first resistance between the first circuit node and the positive current collector, and a second resistance between the second circuit node and the negative current collector; a determining module, configured to determine a circuit model of a solid-state battery conductive agent based on the first circuit node, the second circuit node, the first resistance and the second resistance, the first constructing module comprises: a first constructing unit, configured to construct a first virtual contact pair between the positive active particle and the positive current collector, and a second virtual contact pair between the negative active particle and the negative current collector; a first determining unit, configured to determine the center of the positive active particle as a first contact position of the first virtual contact pair, and determine the center of the negative active particle as a second contact position of the second virtual contact pair; a second constructing unit, configured to construct the first circuit node according to the first contact position, and construct the second circuit node according to the second contact position.

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, The processor executes the computer program to realize the steps of the method in any one of claims 1 to 6.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the method in any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the method in any one of claims 1 to 6. The computer program is executed by the processor to realize the steps of the method in any one of claims 1 to 6.

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