CN113238149B - Method for constructing thermoelectric coupling power battery model - Google Patents
Method for constructing thermoelectric coupling power battery model Download PDFInfo
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- CN113238149B CN113238149B CN202110286971.7A CN202110286971A CN113238149B CN 113238149 B CN113238149 B CN 113238149B CN 202110286971 A CN202110286971 A CN 202110286971A CN 113238149 B CN113238149 B CN 113238149B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000008878 coupling Effects 0.000 title claims abstract description 19
- 238000010168 coupling process Methods 0.000 title claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 19
- 238000005316 response function Methods 0.000 claims abstract description 47
- 238000004088 simulation Methods 0.000 claims abstract description 19
- 230000004044 response Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 6
- 101100495597 Orientia tsutsugamushi groES gene Proteins 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 238000004422 calculation algorithm Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
Abstract
The invention discloses a method for constructing a thermoelectric coupling power battery model, and relates to the technical field. The method comprises the following steps: extracting an electrical performance response function; extracting a thermal performance response function; and (3) obtaining a battery thermal coupling model according to the electrical performance response function and the thermal performance function obtained in the first step and the second step, and taking the output temperature of the thermal performance response as the input of the electrical performance response function to form closed loop simulation. According to the invention, through an electrical performance response function and a thermal performance response function of the battery thermoelectric coupling model, the output temperature of the thermal performance response is used as the input of the electrical performance response function, so that closed loop simulation is formed; the working temperature of the power battery can be restored more accurately, the simulation precision is improved, and support is provided for design optimization of related systems and algorithms.
Description
Technical Field
The invention belongs to the technical field of battery health simulation, and particularly relates to a method for constructing a thermoelectric coupling power battery model.
Background
The power battery provides a power source for the new energy automobile, is a key core component of the new energy automobile, and is an important precondition for normal operation of the whole automobile. The power battery model can simulate the output characteristics of a battery, can be widely applied to the fields of whole vehicle modeling, battery management system algorithm development, power battery pack design and the like, and is a key part of product development and battery performance monitoring.
Common power cell modeling is generally based on RC equivalent circuit models. The model extracts equivalent performance parameters required by the model according to dynamic performance test data of the battery, simulates the output voltages of the battery under different currents, and estimates the current state of charge. The model is generally used for extracting parameters based on dynamic performance test data in a standard environment, and takes the current working environment temperature and working current of the battery as input conditions and the working voltage of the battery as output. The model cannot comprehensively consider the influence of the heat generated by the battery heat exchange system and the battery in the working state on the battery, and cannot accurately reflect the battery performance under the actual working condition.
Disclosure of Invention
The invention aims to provide a method for constructing a thermoelectric coupling power battery model, which takes the output temperature of thermal performance response as the input of the electrical performance response function through the electrical performance response function and the thermal performance response function of the battery thermoelectric coupling model to form closed loop simulation; the working temperature of the power battery can be restored more accurately, the simulation precision is improved, and support is provided for design optimization of related systems and algorithms.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for constructing a thermoelectric coupling power battery model, which comprises the following steps:
step one, extracting an electrical performance response function, which comprises the following substeps:
stp11, test temperature points T1, T2, T3..Ti for determining battery dynamic performance parameters;
stp12, selecting a test temperature point Ti to test the battery, obtaining dynamic performance parameters of the battery under a group of temperature test points, and extracting modeling parameters of an RC equivalent circuit model, wherein the parameters of the untested temperature points are obtained by adopting a difference value method;
stp13, extracting an ECM electrical performance model according to the parameters of the steps;
step two, extracting a thermal performance response function, which comprises the following substeps:
stp21, determining the temperature T1, T2 and T3 of a battery heat exchange working medium; the flow rates V1, V2 and V3. of the battery heat exchange working medium;
stp22, testing the working temperature of the battery under the temperature Tj and the flow velocity Vk of the battery heat exchange working medium;
stp23, obtaining a plurality of groups of data by changing the temperature Tj and the flow velocity Vk of the battery heat exchange working medium, wherein the data of the battery working temperature under the untested condition is obtained by adopting a difference method;
stp24, extracting a system thermal performance response function according to the data parameters of the steps;
and thirdly, obtaining a battery thermal coupling model according to the electrical performance response function obtained in the first step and the thermal performance response function obtained in the second step, and taking the output temperature of the thermal performance response function as the input of the electrical performance response function to form closed loop simulation.
Further, in step Stp22, based on the data obtained by the test or the simulation, a response function extracting method of the linear time-invariant system is used to obtain a thermal performance response function of the battery, that is, a temperature response of the battery under a unit heating power.
The invention has the following beneficial effects:
according to the invention, through an electrical performance response function and a thermal performance response function of the battery thermoelectric coupling model, the output temperature of the thermal performance response is used as the input of the electrical performance response function, so that closed loop simulation is formed; the working temperature of the power battery can be restored more accurately, the simulation precision is improved, and support is provided for design optimization of related systems and algorithms.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of constructing a thermoelectric coupling power cell model;
fig. 2 is a system diagram of a battery thermal coupling model.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, the invention discloses a method for constructing a thermoelectric coupling power battery model, which comprises the following steps:
step one, extracting an electrical performance response function, which comprises the following substeps:
stp11, determining test temperature points T1, T2, T3..Ti of the dynamic performance parameters of the battery according to the requirements;
stp12, selecting a test temperature point Ti to test the battery, obtaining dynamic performance parameters of the battery under a group of temperature test points, and extracting modeling parameters of an RC equivalent circuit model, wherein the parameters of the untested temperature points are obtained by adopting a difference value method;
stp13, extracting an ECM electrical performance model according to the parameters of the steps;
step two, extracting a thermal performance response function, which comprises the following substeps:
stp21, determining the temperature T1, T2 and T3 of the battery heat exchange working medium according to requirements; the flow rates V1, V2 and V3. of the battery heat exchange working medium;
stp22, testing the working temperature of the battery under the temperature Tj and the flow velocity Vk of the battery heat exchange working medium;
stp23, obtaining a plurality of groups of data by changing the temperature Tj and the flow velocity Vk of the battery heat exchange working medium, wherein the data of the battery working temperature under the untested condition is obtained by adopting a difference method;
stp24, extracting a system thermal performance response function according to the data parameters of the steps;
and thirdly, obtaining a battery thermal coupling model according to the electrical performance response function obtained in the first step and the thermal performance response function obtained in the second step, and taking the output temperature of the thermal performance response function as the input of the electrical performance response function to form closed loop simulation.
In step Stp22, based on the data obtained by the test or the simulation, a response function extracting method of the linear time-invariant system is used to obtain a thermal performance response function of the battery, namely, a temperature response of the battery under unit heating power.
Embodiment one: the battery thermal coupling model is divided into an electrical performance response function and a thermal performance response function. The electric performance response function takes the working current and the working temperature of the battery as input conditions, so that the output voltage of the battery under the corresponding conditions can be obtained, and meanwhile, the heating power of the battery is approximately obtained through Joule heat calculation. The thermal performance response function takes the flow rate and the temperature of the working medium of the heat exchange system, the environment temperature of the system and the heating power of the current battery as input conditions, and the working temperature of the battery under the corresponding conditions can be obtained. The temperature is used as an input condition of an electrical performance response function to participate in a new round of simulation operation.
The model is added with a thermal performance transfer function on the basis of an RC equivalent circuit model, so that closed-loop simulation of 'working environment', 'battery output state', 'new working environment' is formed, and the working performance of the battery can be reflected more accurately and effectively.
According to the simulation requirement, determining temperature test points of the dynamic performance parameters of the battery, obtaining the dynamic performance parameters of the battery under a group of temperature test points, extracting modeling parameters of an RC equivalent circuit model, and obtaining parameters of non-tested temperature points by adopting a difference value method.
And determining the flow speed, the temperature and the environmental temperature of the heat exchange working medium according to the actual design condition of the power battery system, and obtaining the battery working temperature under the specified test condition through experimental test. And (3) changing different testing conditions (namely the flow rate, the temperature and the environmental temperature of the heat exchange working medium) to obtain a plurality of groups of data. And obtaining the battery working temperature value under the untested condition by adopting a difference method. The data may also be obtained through system thermal simulation. Based on the data obtained by the test or simulation, a response function extraction method of a linear time-invariant system is used to obtain a thermal characteristic step response function of the power battery, namely the temperature response of the battery under unit heating power.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (2)
1. The method for constructing the thermoelectric coupling power battery model is characterized by comprising the following steps of:
step one, extracting an electrical performance response function, which comprises the following substeps:
stp11, test temperature points T1, T2, T3..Ti for determining battery dynamic performance parameters;
stp12, selecting a test temperature point Ti to test the battery, obtaining dynamic performance parameters of the battery under a group of temperature test points, and extracting modeling parameters of an RC equivalent circuit model, wherein the parameters of the untested temperature points are obtained by adopting a difference value method;
stp13, extracting an ECM electrical performance model according to the parameters of the steps;
step two, extracting a thermal performance response function, which comprises the following substeps:
stp21, determining the temperature T1, T2 and T3 of a battery heat exchange working medium; the flow rates V1, V2 and V3. of the battery heat exchange working medium;
stp22, testing the working temperature of the battery under the temperature Tj and the flow velocity Vk of the battery heat exchange working medium;
stp23, obtaining a plurality of groups of data by changing the temperature Tj and the flow velocity Vk of the battery heat exchange working medium, wherein the data of the battery working temperature under the untested condition is obtained by adopting a difference method;
stp24, extracting a system thermal performance response function according to the data parameters of the steps;
and thirdly, obtaining a battery thermal coupling model according to the electrical performance response function obtained in the first step and the thermal performance response function obtained in the second step, and taking the output temperature of the thermal performance response function as the input of the electrical performance response function to form closed loop simulation.
2. The method for constructing a thermoelectric coupling power battery model according to claim 1, wherein in the step Stp22, based on the data obtained by the test or the simulation, a response function extraction method of a linear time-invariant system is used to obtain a thermal performance response function of the battery, i.e. a temperature response of the battery under a unit heating power.
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| CN111144029A (en) * | 2020-01-02 | 2020-05-12 | 北京理工大学 | Modeling method for thermoelectric coupling characteristics of lithium ion power battery |
| CN111191366A (en) * | 2019-12-30 | 2020-05-22 | 中国第一汽车股份有限公司 | Power battery temperature prediction model based on liquid cooling heat dissipation mode and modeling method |
| CN111914503A (en) * | 2020-08-04 | 2020-11-10 | 重庆大学 | Lithium ion battery power input electric heating coupling model building method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090000652A1 (en) * | 2007-06-26 | 2009-01-01 | Nextreme Thermal Solutions, Inc. | Thermoelectric Structures Including Bridging Thermoelectric Elements |
| WO2015035406A1 (en) * | 2013-09-09 | 2015-03-12 | The Regents Of The University Of California | Battery thermal management systems, apparatuses, and methods |
| CN105680071B (en) * | 2016-03-16 | 2018-04-13 | 华中科技大学 | Based on fractional order sliding moding structure SOFC system thermoelectricity cooperative control methods |
| KR20180048227A (en) * | 2016-10-31 | 2018-05-10 | 주식회사 테그웨이 | Feedback device and method for providing thermal using the same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633501A (en) * | 2014-11-04 | 2016-06-01 | 北京理工大学 | Liquid flow thermal management device and management system of electromobile power battery pack and control method of management system |
| CN107145628A (en) * | 2017-03-31 | 2017-09-08 | 中南大学 | The method of prediction lithium battery cycle life based on electrochemical heat coupling model |
| CN111191366A (en) * | 2019-12-30 | 2020-05-22 | 中国第一汽车股份有限公司 | Power battery temperature prediction model based on liquid cooling heat dissipation mode and modeling method |
| CN111144029A (en) * | 2020-01-02 | 2020-05-12 | 北京理工大学 | Modeling method for thermoelectric coupling characteristics of lithium ion power battery |
| CN111914503A (en) * | 2020-08-04 | 2020-11-10 | 重庆大学 | Lithium ion battery power input electric heating coupling model building method |
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