Conductor voltage estimation methods, electronic devices and storage media

Abstract

This application discloses a conductor voltage estimation method, electronic device, and storage medium, comprising: calculating a first temperature of a target conductor using a calculation module; inputting the first temperature into a pre-built first model; and calculating the voltage of the target conductor using the first model. The method provided in this application can estimate the voltage of a target conductor based on its temperature and a model. This solves the problem of calculating the voltage of a target conductor without adding an AFE chip, thereby reducing the use of AFE chips and saving costs.

Description

Technical Field

[0001] The embodiments of this application relate to the field of battery data acquisition technology, and in particular to a conductor voltage estimation method, electronic device, and storage medium. Background Technology

[0002] Battery packs typically use Active Front End (AFE) chips for individual cell voltage acquisition. An AFE chip has multiple acquisition channels, usually one channel corresponding to one acquisition point. However, in some cases, when all acquisition channels of the AFE chip are occupied, one or two acquisition points remain unacquired. In most cases, an additional AFE chip is added to ensure the accuracy of the individual cell voltage. However, this results in the waste of the remaining channels of the additional AFE chip. Furthermore, adding an extra AFE chip increases costs. In some existing implementations, voltage is obtained by offline measurement of the copper busbar resistance and then calculating the voltage divider based on the current; however, the voltage calculated by this method has low accuracy. Summary of the Invention

[0003] Embodiments of this application provide a conductor voltage estimation method, an electronic device, and a storage medium to solve the technical problem in the prior art of calculating accurate conductor voltage without adding an AFE chip.

[0004] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0005] Firstly, a method for estimating conductor voltage is provided, comprising the following steps:

[0006] The first temperature of the target conductor is calculated using the calculation module.

[0007] The first temperature is input into a pre-built first model;

[0008] The voltage of the target conductor is calculated using the first model.

[0009] In conjunction with the first aspect, the method for constructing the first model includes:

[0010] The first equation is obtained by combining the resistance calculation formula and the Ohm's law formula.

[0011] The first relation is simplified to obtain the first model.

[0012] In conjunction with the first aspect, the method of obtaining the first relational expression by simultaneously solving the resistance calculation formula and Ohm's law formula includes:

[0013] Substituting the resistance calculation formula into the Ohm's law formula yields the voltage-temperature relationship.

[0014] In conjunction with the first aspect, the method for calculating the first temperature of the target conductor using a calculation module includes:

[0015] Acquire parameter data of at least four neighboring conductors that are close to the target conductor;

[0016] The parameter data is input into the first model, and the second temperature of the adjacent conductor is calculated by the first calculation module.

[0017] The second temperature is input into a pre-built second model, and the first heat dissipation coefficient of the target conductor is calculated by the second calculation module.

[0018] The first heat dissipation coefficient is input into the second model, and the first temperature is calculated by the second calculation module.

[0019] In conjunction with the first aspect, the construction method of the second model includes:

[0020] The second relation is obtained based on the energy conservation law formula;

[0021] The third relationship is obtained based on the specific heat capacity formula;

[0022] The fourth relation is obtained based on Newton's law of cooling.

[0023] The fifth relation is obtained from the Joule's law formula;

[0024] The second model is obtained based on the second relation and in combination with the third, fourth and fifth relations.

[0025] In conjunction with the first aspect, the second relationship is the relationship between actual heat output and total heat generation and total heat dissipation; the third relationship is the relationship between actual heat output and the parameter data; the fourth relationship is the relationship between total heat dissipation and heat dissipation coefficient; and the fifth relationship is the relationship between total heat output and the parameter data.

[0026] The temperature-heat dissipation coefficient relationship is obtained based on the second, third, fourth and fifth relationships.

[0027] In conjunction with the first aspect, the method for obtaining a first heat dissipation coefficient of a target conductor by inputting the second temperature into a pre-constructed second model includes:

[0028] Obtain the second temperature of the plurality of adjacent conductors;

[0029] Multiple second temperatures are input into the second model, and the second heat dissipation coefficients of the multiple adjacent conductors are calculated by the second calculation module.

[0030] The heat dissipation coefficient of the target conductor is obtained by calculating the heat dissipation coefficient of multiple adjacent conductors using interpolation.

[0031] In conjunction with the first aspect, the parameter data includes one or more of the following: current, voltage, resistance, resistivity, temperature rise coefficient, length, cross-sectional area, cross-sectional perimeter, and duration.

[0032] In a second aspect, an electronic device is provided, including a memory and a processor; the memory is used to store a computer program; the processor is used to implement the conductor voltage estimation method as described in the first aspect when the computer program is executed.

[0033] In a second aspect, a computer-readable storage medium storing a computer program that, when executed by a processor, implements the conductor voltage estimation method as described in the first aspect.

[0034] One of the above technical solutions has the following advantages or beneficial effects:

[0035] Compared with existing technologies, this application provides a conductor voltage estimation method, which includes: calculating a first temperature of a target conductor using a calculation module; inputting the first temperature into a pre-built first model; and calculating the voltage of the target conductor using the first model. The method provided by this application can estimate the voltage of a target conductor based on its temperature and the model. This solves the problem of calculating the voltage of a target conductor without adding an AFE chip, thereby reducing the use of AFE chips and saving costs. Attached Figure Description

[0036] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of the method flow provided in the embodiments of this application;

[0038] Figure 2 A schematic flowchart illustrating the method for calculating the first temperature provided in an embodiment of this application;

[0039] Figure 3 A line graph showing the second heat dissipation coefficient of the adjacent conductor provided in an embodiment of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] The specific implementation methods of this application are illustrated below through examples:

[0042] like Figure 1 As shown in the figure, this application provides a method for estimating conductor voltage, including the following steps:

[0043] S1: The first temperature of the target conductor is calculated by the calculation module;

[0044] like Figure 2 As shown, the specific calculation steps are as follows:

[0045] S101: Obtain parameter data of at least four adjacent conductors close to the target conductor;

[0046] The position of the target conductor in the circuit is obtained by reading the parameter data of several adjacent conductors close to the target conductor through an AFE chip or obtaining them from a known database. Since the operating state and environment of the adjacent conductors close to the target conductor are similar to those of the target conductor, the parameter data of the adjacent conductors can be used as reference data for the target conductor.

[0047] The parameters of the adjacent conductor include current, voltage, resistance, resistivity, temperature rise coefficient, length, cross-sectional area, and perimeter. Current, voltage, resistance, and duration are variable parameters of the adjacent conductor during operation and need to be measured by the AFE chip. Resistivity, temperature rise coefficient, length, cross-sectional area, and perimeter are inherent parameters of the adjacent conductor itself. These parameters are also known about the target conductor and can be obtained from a database, without needing to be obtained through the AFE chip. It is understandable that the more adjacent conductors acquired, the more accurate the calculated data will be. Therefore, to ensure a certain level of accuracy, at least four adjacent conductors should be selected, but five, six, or even more are also possible. The specific number can be set according to needs and will not be elaborated here.

[0048] S102: Input the parameter data into the first model, and calculate the second temperature of the adjacent conductor through the first calculation module;

[0049] First, a primary model needs to be constructed. This primary model is a voltage-temperature model, meaning that the temperature can be calculated given the voltage, or vice versa. The construction method includes:

[0050] The first equation is obtained by combining the resistance calculation formula and the Ohm's law formula.

[0051] The first relationship is the voltage-temperature relationship, which can be obtained by substituting the resistance calculation formula into Ohm's law formula.

[0052] The formula for Ohm's law is obtained by transforming it:

[0053] U = IR;

[0054] Where I represents conductor current, in A; R represents conductor resistance, in Ω; and U represents conductor voltage, in V.

[0055] The specific content of the resistance calculation formula is as follows:

[0056] R = ρ0(1+αT)L / S;

[0057] Where ρ0 represents the initial resistivity of the conductor, in Ω·m; α represents the temperature rise coefficient of the conductor resistance, in 1 / ℃; T represents the conductor temperature, in ℃; L represents the conductor length, in m; and S represents the conductor cross-sectional area, in ㎡.

[0058] Substituting the resistance calculation formula into Ohm's law formula, we get:

[0059] U / L=(αIρ0 / S)T+Iρ0 / S;

[0060] Simplify the above formula:

[0061] U / L = Y = kT + b;

[0062] This yields a linear equation in one variable relating the conductor voltage and conductor temperature, where k and b are known constants in the linear equation, k represents αIρ0 / S, b represents Iρ0 / S, L represents the conductor length (a known quantity), and Y represents the quotient of voltage U and conductor length L; this linear equation is the first model.

[0063] Therefore, by inputting the obtained temperature rise coefficients α, current I, initial resistivity ρ0, cross-sectional area S, voltage U, and conductor length L of multiple adjacent conductors into the first model, the second temperature of the adjacent conductors can be calculated; that is:

[0064] T = (U / Lb) / k.

[0065] S103: Input the second temperature into the pre-built second model, and calculate the first heat dissipation coefficient of the target conductor through the second calculation module;

[0066] First, a second model needs to be constructed. The construction method for the second model includes the following steps:

[0067] The second relation is obtained based on the energy conservation law formula;

[0068] The third relationship is obtained based on the specific heat capacity formula;

[0069] The fourth relation is obtained based on Newton's law of cooling.

[0070] The fifth relation is obtained from the Joule's law formula;

[0071] The second model is obtained based on the second relation and combined with the third, fourth, and fifth relations; wherein, the second relation represents the relationship between actual heat output and total heat generation and total heat dissipation; the third relation represents the relationship between actual heat output and parameter data; the fourth relation represents the relationship between total heat dissipation and heat dissipation coefficient; and the fifth relation represents the relationship between total heat generation and parameter data; the specific construction steps include:

[0072] The specific content of the law of conservation of energy is as follows:

[0073] Q 实际 =Q 发热 -Q 散热 ;

[0074] Among them, Q 实际 Q represents the actual heat output. 发热 Q represents the total heat output. 散热 This indicates the total heat dissipation.

[0075] According to the specific heat capacity formula, we can obtain:

[0076] Q 实际 =Cm△T;

[0077] Where C represents the specific heat capacity of the conductor, m represents the mass of the conductor in kg, ΔT represents the temperature rise of the conductor in °C, and m = PSL, where P represents the density of the conductor in kg / m³. 3 S represents the conductor cross-sectional area, in square meters (m), and L represents the conductor length, in meters (m).

[0078] According to the specific content of Newton's law of cooling, we can obtain:

[0079] Q 散热 =K t ML△Tt;

[0080] Among them, K t The conductor's overall heat dissipation coefficient is expressed in W / m²·℃, M represents the conductor's cross-sectional perimeter in meters, ΔT represents the conductor's temperature rise in ℃, and t represents the conductor's operating duration in seconds.

[0081] According to the specific content of Joule's law formula, we can obtain:

[0082] Q 发热 =I 2 Rt;

[0083] Where I represents the conductor current in A, R represents the conductor resistance in Ω, and t represents the conductor's operating duration in s.

[0084] By combining the specific contents of Joule's law formula, Newton's law of cooling formula, and specific heat capacity formula, the specific contents of the energy conservation law formula are rewritten to obtain:

[0085] Cm△T=I 2 Rt-K t ML△Tt=I 2 tρ0(1+αT)L / SK t ML△Tt;

[0086] Since temperature T can be converted into T = T0 + ΔT, where T0 represents the initial temperature of the conductor and ΔT represents the temperature increment;

[0087] Therefore, the above equation can be rewritten as Cm△T=I 2 tρ0(1+α(T0+△T))L / SK t ML△Tt;

[0088] Taking △T as a separate case, we can further rewrite the formula to obtain:

[0089] △T=(I2 ρ0t+I 2 tρ0αt) / (CPS 2 +K t Mt-I 2 ρ0t)+T0(I 2 ρ0t) / (CPS 2 +K t Mt-I 2 tρ0t);

[0090] Therefore, through the derivation of the above formula, we can obtain the relationship between the temperature rise α and the overall heat dissipation coefficient K. t This is relevant. Therefore, further simplification of the above equation yields:

[0091] △T=a / (bK t (x)+a)+dT0 / (bK t (x)+a);

[0092] The current I, initial resistivity ρ0, working duration t, temperature rise coefficient α, cross-sectional area S, density P, specific heat capacity C, and cross-sectional perimeter M are all known quantities.

[0093] Therefore, by inputting the second temperatures T0 of the multiple adjacent conductors into the above formula, the comprehensive heat dissipation coefficient K of the multiple adjacent conductors can be calculated. t That is, the second heat dissipation coefficient.

[0094] Then, by using interpolation to calculate the second heat dissipation coefficient of multiple adjacent conductors, the first heat dissipation coefficient of the target conductor can be obtained. For example... Figure 3 The figure shows a line graph of the second heat dissipation coefficient of 10 adjacent conductors provided in the embodiment of this application. The vertical axis represents the specific value of the second heat dissipation coefficient, and the horizontal axis represents the adjacent conductors numbered 1-10. When calculating the first heat dissipation coefficient of the target conductor, the target conductor is arranged according to its position and the positions of the adjacent conductors numbered 1-10, so that the specific value of the first heat dissipation coefficient of the target conductor is calculated.

[0095] S104: Input the first heat dissipation coefficient into the second model, and calculate the first temperature through the second calculation module;

[0096] Substitute the calculated first heat dissipation coefficient into the following formula:

[0097] △T=(I 2 ρ0t+I 2 tρ0αt) / (CPS 2 +K t Mt-I 2 ρ0t)+T0(I 2 ρ0t) / (CPS 2 +Kt Mt-I 2 tρ0t);

[0098] Or in the following formula:

[0099] △T=a / (bKt(x)+a)+dT0 / (bKt(x)+a);

[0100] The first temperature of the target conductor can be calculated based on the current I, initial resistivity ρ0, working duration t, temperature rise coefficient α, cross-sectional area S, density P, specific heat capacity C, cross-sectional perimeter M, and first heat dissipation coefficient.

[0101] S2: Input the first temperature into the pre-built first model;

[0102] The first temperature of the target conductor is input into the first model;

[0103] The calculation formula for the first model is:

[0104] U / L=(αIρ0 / S)T+Iρ0 / S;

[0105] Or:

[0106] U / L = Y = kT + b;

[0107] S3: Calculate the voltage of the target conductor using the first model.

[0108] The current I, initial resistivity ρ0, temperature rise coefficient α, and cross-sectional area S of the target conductor are input into the first model. The voltage of the target conductor can then be obtained by calculation based on the first model.

[0109] U=((αIρ0 / S)·T+Iρ0 / S) / L.

[0110] It should be noted that the conductor referred to in the embodiments of this application can be a conductive wire, copper busbar, copper sheet, or copper strip, etc. The method of this application allows for the calculation of voltage or temperature for any conductive conductor.

[0111] This application provides an electronic device, including a memory and a processor; the memory is used to store a computer program; the processor is used to implement the conductor voltage estimation method as described above when the computer program is executed.

[0112] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the conductor voltage estimation method described above.

[0113] The present application provides a detailed description of a conductor voltage estimation method, electronic device, and storage medium. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for estimating conductor voltage, characterized in that, Includes the following steps: The first temperature of the target conductor is calculated using a calculation module, and the method includes: Acquire parameter data of at least four adjacent conductors close to the target conductor, the parameter data including: temperature rise coefficient α, current I, initial resistivity ρ0, cross-sectional area S, voltage U and conductor length L; The parameter data is input into a pre-built first model, and the second temperature of the adjacent conductor is calculated by the first calculation module. The calculation formula of the first model is: U / L=Y=kT+b, where k and b are known constants of the calculation formula; T represents the conductor temperature; k represents αIρ0 / S; b represents Iρ0 / S; L represents the conductor length, which is a known quantity; Y represents the quotient of voltage U and conductor length L. The second temperature is input into a pre-built second model, and the first heat dissipation coefficient of the target conductor is calculated by the second calculation module, including: Obtain the second temperature of the plurality of adjacent conductors; The second temperature of multiple adjacent conductors is input into the second model to calculate the second heat dissipation coefficient of the multiple adjacent conductors; The heat dissipation coefficient of the target conductor is obtained by calculating the heat dissipation coefficients of multiple adjacent conductors using interpolation methods. The first heat dissipation coefficient is input into the second model, and the first temperature is calculated by the second calculation module. Input the first temperature into the first model; The voltage of the target conductor is calculated using the first model.

2. The conductor voltage estimation method as described in claim 1, characterized in that, The method for constructing the first model includes: The first equation is obtained by combining the resistance calculation formula and the Ohm's law formula. The first relation is simplified to obtain the first model.

3. The conductor voltage estimation method as described in claim 2, characterized in that, The method of obtaining the first relational expression by simultaneously solving the resistance calculation formula and Ohm's law formula includes: Substituting the resistance calculation formula into the Ohm's law formula yields the voltage-temperature relationship.

4. The conductor voltage estimation method as described in claim 1, characterized in that, The construction method of the second model includes: The second relation is obtained based on the energy conservation law formula; The third relationship is obtained based on the specific heat capacity formula; The fourth relation is obtained based on Newton's law of cooling. The fifth relation is obtained from the Joule's law formula; The second model is obtained based on the second relation and in combination with the third, fourth and fifth relations.

5. The conductor voltage estimation method as described in claim 4, characterized in that, The second relationship is the relationship between actual heat output and total heat generation and total heat dissipation; the third relationship is the relationship between actual heat output and the parameter data; the fourth relationship is the relationship between total heat dissipation and heat dissipation coefficient; the fifth relationship is the relationship between total heat output and the parameter data. The temperature-heat dissipation coefficient relationship is obtained based on the second, third, fourth and fifth relational expressions.

6. An electronic device, characterized in that: It includes a memory and a processor; the memory is used to store a computer program; the processor is used to implement the conductor voltage estimation method as described in any one of claims 1 to 5 when the computer program is executed.

7. A computer-readable storage medium, characterized in that: The storage medium stores a computer program that, when executed by a processor, implements the conductor voltage estimation method as described in any one of claims 1 to 5.

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