Lithium battery aging analysis method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a lithium battery aging analysis method and device, electronic equipment and a storage medium, and belongs to the technical field of battery analysis. The method comprises the following steps: constructing a first battery pseudo two-dimensional model based on a plurality of battery basic parameters; acquiring a first potential set according to the plurality of first key coordinate points; generating a first differential voltage curve group; any battery basic parameter is selected from the battery basic parameters to serve as a comparison parameter to be modified, and the unmodified battery basic parameters serve as remaining battery basic parameters; constructing a second battery pseudo two-dimensional model according to the comparison parameters and the basic parameters of the remaining batteries; acquiring a second potential set according to the plurality of second key coordinate points, and generating a second differential voltage curve group; and comparing the first differential voltage curve group with the second differential voltage curve group, and determining the influence degree of the comparison parameters on the lithium battery aging according to the comparison result. Through the provided scheme, the experiment cost is reduced, and the analysis efficiency and accuracy are improved.

Description

Technical Field

[0001] The present application relates to the field of battery analysis technology, and in particular to a lithium battery aging analysis method, device, electronic device and storage medium. Background Art

[0002] At present, lithium batteries, as a high-performance rechargeable battery, are widely used in portable electronic devices, electric vehicles, energy storage systems and other fields. With the rapid growth of the new energy market, the demand for lithium batteries continues to rise, and the demand for lithium battery performance and life is also increasing. The existing technical solutions have high experimental costs when analyzing the aging process and aging factors of lithium batteries. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide a lithium battery aging analysis method, device, electronic device and computer-readable storage medium.

[0004] In a first aspect, an embodiment of the present application provides a lithium battery aging analysis method, the method comprising: constructing a first battery pseudo two-dimensional model based on a plurality of battery basic parameters;

[0005] Acquire a first potential set according to a plurality of first key coordinate points of the first battery pseudo two-dimensional model;

[0006] generating a first differential voltage curve set according to the first potential set;

[0007] Select any one of the battery basic parameters as a comparison parameter for modification, and use the unmodified battery basic parameters as the remaining battery basic parameters;

[0008] Constructing a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters;

[0009] Acquire a second potential set according to a plurality of second key coordinate points of the second battery pseudo two-dimensional model;

[0010] generating a second set of differential voltage curves according to the second set of potentials;

[0011] The first differential voltage curve group and the second differential voltage curve group are compared, and the influence degree of the comparison parameter on the aging of the lithium battery is determined according to the comparison result.

[0012] In one embodiment, the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector are determined according to the first pseudo two-dimensional model of the battery, and a first probe, a second probe and a third probe are respectively set at the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector;

[0013] Record the reference potential of the center coordinate point of the diaphragm according to the first probe, record the positive electrode potential of the positive electrode current collector coordinate point according to the second probe, and record the negative electrode potential of the negative electrode current collector coordinate point according to the third probe;

[0014] The reference potential, the positive electrode potential and the negative electrode potential are taken as the first potential set.

[0015] In one embodiment, the full cell voltage, the positive electrode potential difference and the negative electrode potential difference are obtained according to the reference potential, the positive electrode potential and the negative electrode potential;

[0016] generating a full-battery differential voltage curve, a positive electrode differential voltage curve, and a negative electrode differential voltage curve according to the full-battery voltage, the positive electrode potential difference, and the negative electrode potential difference, respectively;

[0017] The full-battery differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve are taken as the first differential voltage curve group.

[0018] In one embodiment, the first battery pseudo two-dimensional model is controlled to perform energy conversion according to a preset power, and the full battery voltage, the positive electrode potential difference, and the negative electrode potential difference are calculated respectively.

[0019] In one embodiment, the full cell voltage is obtained according to the difference between the positive electrode potential and the negative electrode potential;

[0020] Obtaining the positive electrode potential difference according to the difference between the positive electrode potential and the reference potential;

[0021] The negative electrode potential difference is obtained according to the difference between the negative electrode potential and the reference potential.

[0022] In one embodiment, the first battery pseudo two-dimensional model is controlled to perform energy conversion according to a preset power and record the battery capacity value;

[0023] Calculating the derivatives of the full-battery voltage, the positive electrode potential difference and the negative electrode potential difference with respect to time respectively, to obtain a full-battery derivative, a positive electrode derivative and a negative electrode derivative;

[0024] Calculating the derivative of the battery capacity value with respect to time to obtain a second derivative;

[0025] generating the full-battery differential voltage curve according to the full-battery derivative and the second derivative;

[0026] generating the positive electrode differential voltage curve according to the positive electrode derivative and the second derivative;

[0027] The negative differential voltage curve is generated based on the negative derivative and the second derivative.

[0028] In a second aspect, an embodiment of the present application provides a lithium battery aging analysis device, the lithium battery aging analysis device comprising:

[0029] A first building module, used to build a first battery pseudo two-dimensional model based on a plurality of battery basic parameters;

[0030] A first acquisition module, configured to acquire a first potential set according to a plurality of first key coordinate points of the first pseudo two-dimensional model of the battery;

[0031] A first generating module, configured to generate a first differential voltage curve group according to the first potential set;

[0032] A modification module, used for selecting any battery basic parameter from the battery basic parameters as a comparison parameter for modification, and using the unmodified battery basic parameter as the remaining battery basic parameter;

[0033] A second construction module, used to construct a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters;

[0034] A second acquisition module, used for acquiring a second potential set according to a plurality of second key coordinate points of the second battery pseudo two-dimensional model;

[0035] a second generating module, configured to generate a second differential voltage curve group according to the second potential set;

[0036] A comparison module is used to compare the first differential voltage curve group and the second differential voltage curve group, and determine the influence of the comparison parameter on the aging of the lithium battery according to the comparison result.

[0037] In one embodiment, a setting module is used to determine the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector according to the first pseudo two-dimensional model of the battery, and respectively set a first probe, a second probe and a third probe at the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector;

[0038] A recording module, used to record the reference potential of the center coordinate point of the diaphragm according to the first probe, record the positive electrode potential of the positive electrode collector coordinate point according to the second probe, and record the negative electrode potential of the negative electrode collector coordinate point according to the third probe;

[0039] As a module, the reference potential, the positive electrode potential and the negative electrode potential are used as the first potential set.

[0040] In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and when the computer program is run by the processor, the lithium battery aging analysis method provided in the first aspect is executed.

[0041] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which executes the lithium battery aging analysis method provided in the first aspect when running on a processor.

[0042] The lithium battery aging analysis method, device, electronic device and storage medium provided by the present application above construct a first battery pseudo two-dimensional model based on multiple battery basic parameters; obtain a first potential set according to multiple first key coordinate points; and generate a first differential voltage curve group; select any battery basic parameter from the battery basic parameters as a comparison parameter for modification, and use the unmodified battery basic parameters as the remaining battery basic parameters; construct a second battery pseudo two-dimensional model based on the comparison parameters and the remaining battery basic parameters; obtain a second potential set according to multiple second key coordinate points, and generate a second differential voltage curve group; compare the first differential voltage curve group and the second differential voltage curve group, and determine the degree of influence of the comparison parameters on the aging of the lithium battery according to the comparison results. By constructing a battery pseudo two-dimensional model, modifying the battery basic parameters, and determining the degree of influence of each battery basic parameter on the aging of the lithium battery, the experimental cost is reduced and the efficiency and accuracy of the analysis of lithium battery aging factors are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0044] Figure 1 A schematic diagram of a process of a lithium battery aging analysis method provided in an embodiment of the present application is shown;

[0045] Figure 2 A schematic diagram of a three-electrode model provided in an embodiment of the present application is shown;

[0046] Figure 3 A schematic diagram of a differential voltage curve provided by an embodiment of the present application is shown;

[0047] Figure 4 A schematic diagram of a full-battery differential voltage curve provided in an embodiment of the present application is shown;

[0048] Figure 5 A schematic diagram of a positive electrode differential voltage curve provided in an embodiment of the present application is shown;

[0049] Figure 6 A schematic diagram of a negative electrode differential voltage curve provided in an embodiment of the present application is shown;

[0050] Figure 7 A schematic diagram of the structure of a lithium battery aging analysis device provided in an embodiment of the present application is shown;

[0051] Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown.

[0052] Icon: 700-lithium battery aging analysis device, 701-first building module, 702-first acquisition module, 703-first generation module, 704-modification module, 705-second building module, 706-second acquisition module, 707-second generation module, 708-comparison module, 709-setting module, 710-recording module, 711-as module, 800-electronic device, 801-transceiver, 802-processor, 803-memory. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0054] The components of the embodiments of the present application generally described and shown in the drawings herein may 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.

[0055] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0056] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0057] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0058] The existing experimental methods for lithium battery aging analysis are costly, time-consuming, and complex in data processing, making it difficult to comprehensively and accurately evaluate the battery aging process and aging factors. Therefore, this application proposes a lithium battery aging analysis method, which aims to reduce research costs while improving analysis efficiency and accuracy through simulation, and can monitor the electrochemical reactions inside the battery in real time and capture aging characteristics under different working conditions.

[0059] Example 1

[0060] The embodiment of the present application provides a lithium battery aging analysis method.

[0061] See also Figure 1 , lithium battery aging analysis methods include:

[0062] S101, constructing a first battery pseudo two-dimensional model based on a plurality of battery basic parameters.

[0063] It should be noted that multiple basic battery parameters include battery design parameters and battery material parameters. The battery design parameters include the length, width, thickness of the positive and negative electrodes of the battery and the thickness of the diaphragm, etc. The battery material parameters include the electrochemical properties of the positive and negative electrode materials, such as diffusion coefficient, electrical conductivity, reaction rate constant, etc.

[0064] In the process of constructing the first pseudo two-dimensional battery model, the thickness direction of the battery is defined as the x-axis direction. The range of the x-axis is determined according to the battery design parameters, such as the total thickness of the battery (including the sum of the thickness of the negative electrode, the separator, the positive electrode, etc.). If the thickness of the negative electrode of the battery is known to be Lneg, the thickness of the separator is Lsep, and the thickness of the positive electrode is Lpos, then the range of the x-axis can be from 0 to Lneg+Lsep+Lpos.

[0065] The r-axis direction is defined as the radius direction of the active particle material of the battery. If the radius of the active particle material is R, the r-axis range is from 0 to R. The r-axis direction is not directly drawn in the geometry, but it needs to be defined. Among them, the x-axis direction is the one-dimensional part of the first battery pseudo two-dimensional model, and the r-axis direction is the two-dimensional part of the first battery pseudo two-dimensional model.

[0066] By constructing a pseudo two-dimensional model, the potential of different parts of the battery can be accurately measured. By accurately measuring the potential, the power performance of the battery at different aging stages can be better evaluated.

[0067] S102: Acquire a first potential set according to a plurality of first key coordinate points of the first pseudo two-dimensional model of the battery.

[0068] In one embodiment, the center coordinate point of the diaphragm, the coordinate point of the positive current collector and the coordinate point of the negative current collector are determined according to the first pseudo two-dimensional model of the battery, and a first probe, a second probe and a third probe are respectively set at the center coordinate point of the diaphragm, the coordinate point of the positive current collector and the coordinate point of the negative current collector; the reference potential of the center coordinate point of the diaphragm is recorded according to the first probe, the positive electrode potential of the positive current collector coordinate point is recorded according to the second probe, and the negative electrode potential of the negative current collector coordinate point is recorded according to the third probe; the reference potential, the positive electrode potential and the negative electrode potential are used as the first potential set.

[0069] It should be noted that the separator center coordinate point, the positive electrode current collector coordinate point and the negative electrode current collector coordinate point are determined according to the thickness of the battery negative electrode, the separator thickness and the positive electrode thickness.

[0070] For example, the coordinate of the left end of the negative electrode is x=0, and the position of the negative electrode current collector probe is determined to be x=0. The thickness of the battery negative electrode is set to Lneg, and the interval occupied by the battery negative electrode in the x-axis direction is from x=0 to x=Lneg. The thickness of the separator is set to Lsep, and the battery separator is from x=Lneg to x=Lsep in the x-axis direction. Therefore, the coordinate point position of the separator center is x=Lneg+Lsep / 2. The thickness of the positive electrode is set to Lpos, and the coordinate point position of the positive electrode current collector is x=Lneg+Lsep+Lpos.

[0071] like Figure 2 As shown, Figure 2 It is a schematic diagram of the three-electrode model. The first probe is inserted into the coordinate point of the center of the diaphragm to measure and record the potential at that position to determine the reference potential REphil. The second probe is inserted into the coordinate point of the positive electrode collector to measure and record the potential at that position to determine the positive electrode potential Vpos. The third probe is inserted into the coordinate point of the negative electrode collector to measure and record the potential at that position to determine the negative electrode potential Vneg.

[0072] The potential data obtained from the collector position in this application is relatively single and direct, and the data processing process is relatively simple. There is no need for complex integration and analysis of a large amount of data from different positions and dimensions, which further increases the efficiency of analyzing lithium battery aging factors.

[0073] S103: Generate a first differential voltage curve group according to the first potential set.

[0074] In one embodiment, the full-cell voltage, the positive electrode potential difference and the negative electrode potential difference are obtained according to the reference potential, the positive electrode potential and the negative electrode potential; the full-cell differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve are generated according to the full-cell voltage, the positive electrode potential difference and the negative electrode potential difference, respectively; the full-cell differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve are used as the first differential voltage curve group.

[0075] Among them, the first battery pseudo two-dimensional model is controlled to perform energy conversion according to a preset power, and the full battery voltage, the positive electrode potential difference and the negative electrode potential difference are calculated respectively.

[0076] In this embodiment, the first battery pseudo two-dimensional model is controlled to charge and discharge according to a preset power, and the full battery voltage, positive electrode potential difference and negative electrode potential difference in the charging state, and the full battery voltage, positive electrode potential difference and negative electrode potential difference in the discharging state are obtained, and the full battery differential voltage curve, positive electrode differential voltage curve and negative electrode differential voltage curve in the charging state and the full battery differential voltage curve, positive electrode differential voltage curve and negative electrode differential voltage curve in the discharging state are obtained according to the full battery voltage, positive electrode potential difference and negative electrode potential difference, respectively.

[0077] It should be noted that, in the embodiment of the present application, the full battery voltage is obtained according to the difference between the positive electrode potential and the negative electrode potential; the positive electrode potential difference is obtained according to the difference between the positive electrode potential and the reference potential; and the negative electrode potential difference is obtained according to the difference between the negative electrode potential and the reference potential.

[0078] In one embodiment, the first battery pseudo two-dimensional model is controlled to perform energy conversion according to a preset power, and the battery capacity value is recorded; the derivatives of the full battery voltage, the positive electrode potential difference and the negative electrode potential difference with respect to time are calculated respectively to obtain a full battery derivative, a positive electrode derivative and a negative electrode derivative; the derivative of the battery capacity value with respect to time is calculated to obtain a second derivative; the full battery differential voltage curve is generated according to the full battery derivative and the second derivative; the positive electrode differential voltage curve is generated according to the positive electrode derivative and the second derivative; the negative electrode differential voltage curve is generated according to the negative electrode derivative and the second derivative.

[0079] It should be noted that by setting the differential voltage curve formula dV / dQ, this formula can reflect the change in voltage of the battery during the charging and discharging process, and is used to identify the electrochemical reactions and aging factors inside the battery.

[0080] In the simulation post-processing operation, the voltage V and the capacity Q are both dependent variables of time t, and time t is a single independent variable. Therefore, dV / dQ cannot be directly calculated, so it needs to be converted as shown below: dV / dQ = (dV / dt) / (dQ / dt) = d(V, t) / (d(Q, t)), where d(V, t) represents the derivative of the voltage V with respect to time t, and d(Q, t) represents the derivative of the capacity Q with respect to time t.

[0081] After the pseudo two-dimensional model of the control battery is simulated and calculated, the full battery voltage, positive electrode potential difference and negative electrode potential difference are obtained. The obtained full battery voltage, positive electrode potential difference and negative electrode potential difference are substituted into the above differential voltage curve formula to obtain the full battery differential voltage curve, positive electrode differential voltage curve and negative electrode differential voltage curve respectively.

[0082] The embodiment of the present application generates a full-battery differential voltage curve, a positive electrode differential voltage curve, and a negative electrode differential voltage curve, respectively, for subsequent analysis of lithium battery aging factors. By comparing different curves, the degree of aging of the lithium battery can be more intuitively identified.

[0083] S104, selecting any one of the battery basic parameters as a comparison parameter to be modified, and using the unmodified battery basic parameters as the remaining battery basic parameters.

[0084] The battery aging is simulated by changing the corresponding battery design parameters or battery material parameters, for example, the amount of positive electrode active material is reduced to simulate the loss of positive electrode active material during aging, or the loss of negative electrode active material, electrolyte loss, etc. Different aging factors lead to different changes in the differential voltage curve. Through simulation, the relevant laws are explored to more accurately analyze the causes of lithium battery aging.

[0085] S105: construct a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters.

[0086] S106: Acquire a second potential set according to a plurality of second key coordinate points of the second battery pseudo two-dimensional model.

[0087] It should be noted that the second key coordinate is consistent with the first key coordinate, and the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector are determined according to the second pseudo two-dimensional model of the battery.

[0088] S107: Generate a second differential voltage curve group according to the second potential set.

[0089] In this embodiment, the second differential curve group is generated by repeating the step of generating the first differential voltage curve group. It should be noted that in other embodiments, more groups of differential curves can be generated for comparison by modifying any basic battery parameter to determine the degree of influence of different comparison parameters on lithium battery aging, thereby further improving the accuracy of the analysis.

[0090] S108, comparing the first differential voltage curve group and the second differential voltage curve group, and determining the influence degree of the comparison parameter on the aging of the lithium battery according to the comparison result.

[0091] It should be noted that by comparing the full battery differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve in the first differential voltage curve group under the charging state with the full battery differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve in the second differential voltage curve group under the charging state, the influence of the comparison parameters on the aging of the lithium battery is determined.

[0092] For example, the starting voltage is set to 2.5V, the constant current charging current is 5A, and the end voltage is set to 4.2V for simulation calculation to obtain the simulated charging voltage curve, and at the same time obtain the full battery voltage Ecell, the positive electrode potential difference Epos and the negative electrode potential difference Eneg.

[0093] According to the differential voltage curve formula d(V,t) / (d(Q,t), the following are generated respectively: Figure 3 A schematic diagram of a differential voltage curve is shown, wherein the differential voltage curve includes: a full battery differential voltage curve Positive differential voltage curve And negative differential voltage curve

[0094] The loss of positive electrode active material during aging is simulated by reducing the amount of positive electrode active material, and the above-mentioned first differential voltage curve group is obtained to obtain the second differential voltage curve group. The influence of corresponding aging factors on lithium batteries is analyzed by comparing the changes in the full battery differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve.

[0095] In this embodiment, by generating a change diagram of the differential voltage curve corresponding to the positive electrode active material without loss, loss of 10% and loss of 20%, the influence of the positive electrode active material on the aging of the lithium battery can be obtained. Figure 4 To include the full battery differential voltage curve, Figure 5 is the positive differential voltage curve, Figure 6 By comparing the differential voltage curves under different parameters, analyzing the impact of battery aging, identifying the main aging factors, and finding out the main factors affecting battery life.

[0096] The lithium battery aging analysis method provided in this embodiment constructs a first battery pseudo two-dimensional model based on multiple battery basic parameters; obtains a first potential set according to multiple first key coordinate points; and generates a first differential voltage curve group; selects any battery basic parameter from the battery basic parameters as a comparison parameter for modification, and uses the unmodified battery basic parameters as the remaining battery basic parameters; constructs a second battery pseudo two-dimensional model based on the comparison parameters and the remaining battery basic parameters; obtains a second potential set according to multiple second key coordinate points, and generates a second differential voltage curve group; compares the first differential voltage curve group and the second differential voltage curve group, and determines the degree of influence of the comparison parameters on the aging of the lithium battery according to the comparison results. By constructing a battery pseudo two-dimensional model, modifying the battery basic parameters, and determining the degree of influence of each battery basic parameter on the aging of the lithium battery, the experimental cost is reduced, and the efficiency and accuracy of the analysis of lithium battery aging factors are improved.

[0097] Example 2

[0098] In addition, an embodiment of the present application provides a lithium battery aging analysis device.

[0099] like Figure 7 As shown, the lithium battery aging analysis device 700 includes:

[0100] A first construction module 701 is used to construct a first battery pseudo two-dimensional model based on a plurality of battery basic parameters;

[0101] A first acquisition module 702, configured to acquire a first potential set according to a plurality of first key coordinate points of the first battery pseudo two-dimensional model;

[0102] A first generating module 703, configured to generate a first differential voltage curve group according to the first potential set;

[0103] A modification module 704 is used to select any battery basic parameter from the battery basic parameters as a comparison parameter to be modified, and use the unmodified battery basic parameter as the remaining battery basic parameter;

[0104] A second construction module 705 is used to construct a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters;

[0105] A second acquisition module 706, configured to acquire a second potential set according to a plurality of second key coordinate points of the second battery pseudo two-dimensional model;

[0106] A second generating module 707, configured to generate a second differential voltage curve group according to the second potential set;

[0107] The comparison module 708 is used to compare the first differential voltage curve group and the second differential voltage curve group, and determine the influence of the comparison parameter on the aging of the lithium battery according to the comparison result.

[0108] Optionally, a setting module 709 is used to determine the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector according to the first pseudo two-dimensional model of the battery, and respectively set a first probe, a second probe and a third probe at the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector;

[0109] A recording module 710 is used to record the reference potential of the center coordinate point of the diaphragm according to the first probe, record the positive electrode potential of the positive electrode current collector coordinate point according to the second probe, and record the negative electrode potential of the negative electrode current collector coordinate point according to the third probe;

[0110] As module 711, it is used to use the reference potential, the positive electrode potential and the negative electrode potential as the first potential set.

[0111] The lithium battery aging analysis device 700 provided in this embodiment can implement the lithium battery aging analysis method provided in Example 1, and will not be described again here to avoid repetition.

[0112] The lithium battery aging analysis device provided in this embodiment constructs a pseudo two-dimensional battery model, modifies the basic battery parameters, and determines the degree of influence of each basic battery parameter on the aging of the lithium battery, thereby reducing the experimental cost and improving the analysis efficiency and accuracy of the lithium battery aging factors.

[0113] Example 3

[0114] In addition, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program runs on the processor, the lithium battery aging analysis method provided in Example 8 is executed.

[0115] For details, see Figure 8The electronic device 800 includes: a transceiver 801, a bus interface and a processor 802, wherein the processor 802 is used to: construct a first battery pseudo two-dimensional model based on multiple battery basic parameters; obtain a first potential set according to multiple first key coordinate points of the first battery pseudo two-dimensional model; generate a first differential voltage curve group according to the first potential set; select any battery basic parameter from the battery basic parameters as a comparison parameter for modification, and use the unmodified battery basic parameters as the remaining battery basic parameters; construct a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters; obtain a second potential set according to multiple second key coordinate points of the second battery pseudo two-dimensional model; generate a second differential voltage curve group according to the second potential set; compare the first differential voltage curve group with the second differential voltage curve group, and determine the influence of the comparison parameters on the aging of the lithium battery according to the comparison result.

[0116] In one embodiment, the processor 802 is also used to: determine the center coordinate point of the diaphragm, the positive current collector coordinate point and the negative current collector coordinate point according to the first pseudo two-dimensional model of the battery, and set a first probe, a second probe and a third probe at the center coordinate point of the diaphragm, the positive current collector coordinate point and the negative current collector coordinate point respectively; record the reference potential of the center coordinate point of the diaphragm according to the first probe, record the positive electrode potential of the positive current collector coordinate point according to the second probe, and record the negative electrode potential of the negative current collector coordinate point according to the third probe; use the reference potential, the positive electrode potential and the negative electrode potential as the first potential set.

[0117] In one embodiment, the processor 802 is further used to: obtain the full-battery voltage, the positive electrode potential difference and the negative electrode potential difference according to the reference potential, the positive electrode potential and the negative electrode potential; generate a full-battery differential voltage curve, a positive electrode differential voltage curve and a negative electrode differential voltage curve according to the full-battery voltage, the positive electrode potential difference and the negative electrode potential difference, respectively; and use the full-battery differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve as the first differential voltage curve group.

[0118] In one embodiment, the processor 802 is further used to: control the first battery pseudo two-dimensional model to perform energy conversion according to a preset power, and respectively calculate the full battery voltage, the positive electrode potential difference, and the negative electrode potential difference.

[0119] In one embodiment, the processor 802 is further used to: obtain the full battery voltage according to the difference between the positive electrode potential and the negative electrode potential; obtain the positive electrode potential difference according to the difference between the positive electrode potential and the reference potential; obtain the negative electrode potential difference according to the difference between the negative electrode potential and the reference potential.

[0120] In one embodiment, the processor 802 is also used to: control the first battery pseudo two-dimensional model to perform energy conversion according to a preset power and record the battery capacity value; respectively calculate the derivatives of the full battery voltage, the positive electrode potential difference and the negative electrode potential difference with respect to time to obtain the full battery derivative, the positive electrode derivative and the negative electrode derivative; calculate the derivative of the battery capacity value with respect to time to obtain a second derivative; generate the full battery differential voltage curve according to the full battery derivative and the second derivative; generate the positive electrode differential voltage curve according to the positive electrode derivative and the second derivative; generate the negative electrode differential voltage curve according to the negative electrode derivative and the second derivative.

[0121] In the embodiment of the present application, the electronic device 800 further includes: a memory 803. Figure 8 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 802 and memory represented by memory 803. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 801 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 802 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 802 when performing operations.

[0122] The electronic device 800 provided in the embodiment of the present application can execute the steps of the lithium battery aging analysis method provided in the above method embodiment 1, which will not be described again here to avoid repetition.

[0123] The electronic device provided in this embodiment constructs a pseudo two-dimensional battery model, modifies the basic battery parameters, and determines the influence of each basic battery parameter on the aging of the lithium battery, thereby reducing the experimental cost and improving the analysis efficiency and accuracy of the lithium battery aging factors.

[0124] Example 4

[0125] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the lithium battery aging analysis method provided in Example 1 is implemented.

[0126] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0127] The computer-readable storage medium provided in this embodiment can implement the lithium battery aging analysis method provided in Example 1, and will not be described again here to avoid repetition.

[0128] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or terminal including the element.

[0129] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0130] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A lithium battery aging analysis method, characterized in that: The method comprises: Constructing a first battery pseudo two-dimensional model based on a plurality of battery basic parameters; Acquire a first potential set according to a plurality of first key coordinate points of the first battery pseudo two-dimensional model; generating a first differential voltage curve set according to the first potential set; Select any one of the battery basic parameters as a comparison parameter for modification, and use the unmodified battery basic parameters as the remaining battery basic parameters; Constructing a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters; Acquire a second potential set according to a plurality of second key coordinate points of the second battery pseudo two-dimensional model; generating a second set of differential voltage curves according to the second set of potentials; The first differential voltage curve group and the second differential voltage curve group are compared, and the influence degree of the comparison parameter on the aging of the lithium battery is determined according to the comparison result.

2. The lithium battery aging analysis method according to claim 1, characterized in that: The step of acquiring a first potential set according to a plurality of first key coordinate points of the first pseudo two-dimensional battery model comprises: Determine the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector according to the first pseudo two-dimensional model of the battery, and respectively set a first probe, a second probe and a third probe at the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector; Record the reference potential of the center coordinate point of the diaphragm according to the first probe, record the positive electrode potential of the positive electrode current collector coordinate point according to the second probe, and record the negative electrode potential of the negative electrode current collector coordinate point according to the third probe; The reference potential, the positive electrode potential and the negative electrode potential are taken as the first potential set.

3. The lithium battery aging analysis method according to claim 2, characterized in that: The step of generating a first differential voltage curve group according to the first potential set comprises: Obtaining a full-cell voltage, a positive electrode potential difference, and a negative electrode potential difference according to the reference potential, the positive electrode potential, and the negative electrode potential; generating a full-battery differential voltage curve, a positive electrode differential voltage curve, and a negative electrode differential voltage curve according to the full-battery voltage, the positive electrode potential difference, and the negative electrode potential difference, respectively; The full-battery differential voltage curve, the positive electrode differential voltage curve and the negative electrode differential voltage curve are taken as the first differential voltage curve group.

4. The lithium battery aging analysis method according to claim 3, characterized in that: The step of obtaining a full-cell voltage, a positive electrode potential difference and a negative electrode potential difference according to the reference potential, the positive electrode potential and the negative electrode potential comprises: The first battery pseudo two-dimensional model is controlled to perform energy conversion according to a preset power, and the full battery voltage, the positive electrode potential difference and the negative electrode potential difference are calculated respectively.

5. The lithium battery aging analysis method according to claim 4, characterized in that: The calculating the full battery voltage, the positive electrode potential difference and the negative electrode potential difference respectively comprises: Obtaining the full battery voltage according to the difference between the positive electrode potential and the negative electrode potential; Obtaining the positive electrode potential difference according to the difference between the positive electrode potential and the reference potential; The negative electrode potential difference is obtained according to the difference between the negative electrode potential and the reference potential.

6. The lithium battery aging analysis method according to claim 3, characterized in that: The generating of a full-battery differential voltage curve, a positive electrode differential voltage curve and a negative electrode differential voltage curve according to the full-battery voltage, the positive electrode potential difference and the negative electrode potential difference respectively comprises: Controlling the first battery pseudo two-dimensional model to perform energy conversion according to a preset power and recording the battery capacity value; Calculating the derivatives of the full-battery voltage, the positive electrode potential difference and the negative electrode potential difference with respect to time respectively, to obtain a full-battery derivative, a positive electrode derivative and a negative electrode derivative; Calculating the derivative of the battery capacity value with respect to time to obtain a second derivative; generating the full-battery differential voltage curve according to the full-battery derivative and the second derivative; generating the positive electrode differential voltage curve according to the positive electrode derivative and the second derivative; The negative differential voltage curve is generated based on the negative derivative and the second derivative.

7. A lithium battery aging analysis device, characterized in that: The device comprises: A first building module, used to build a first battery pseudo two-dimensional model based on a plurality of battery basic parameters; A first acquisition module, configured to acquire a first potential set according to a plurality of first key coordinate points of the first pseudo two-dimensional model of the battery; A first generating module, configured to generate a first differential voltage curve group according to the first potential set; A modification module, used for selecting any battery basic parameter from the battery basic parameters as a comparison parameter for modification, and using the unmodified battery basic parameter as the remaining battery basic parameter; A second construction module, used to construct a second battery pseudo two-dimensional model according to the comparison parameters and the remaining battery basic parameters; A second acquisition module, used for acquiring a second potential set according to a plurality of second key coordinate points of the second battery pseudo two-dimensional model; a second generating module, configured to generate a second differential voltage curve group according to the second potential set; A comparison module is used to compare the first differential voltage curve group and the second differential voltage curve group, and determine the influence of the comparison parameter on the aging of the lithium battery according to the comparison result.

8. The lithium battery aging analysis device according to claim 7, characterized in that: The device also includes: A setting module, used to determine the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector according to the first pseudo two-dimensional model of the battery, and respectively set a first probe, a second probe and a third probe at the center coordinate point of the diaphragm, the coordinate point of the positive electrode current collector and the coordinate point of the negative electrode current collector; A recording module, used to record the reference potential of the center coordinate point of the diaphragm according to the first probe, record the positive electrode potential of the positive electrode collector coordinate point according to the second probe, and record the negative electrode potential of the negative electrode collector coordinate point according to the third probe; As a module, the reference potential, the positive electrode potential and the negative electrode potential are used as the first potential set.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a computer program, and the computer program executes the lithium battery aging analysis method according to any one of claims 1 to 6 when the processor is running.

10. A computer-readable storage medium, characterized in that: The computer program stores a computer program, which executes the lithium battery aging analysis method according to any one of claims 1 to 6 when running on a processor.

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