CN115292807A - Method and system for determining damping of battery pack, electronic device and storage medium - Google Patents
Method and system for determining damping of battery pack, electronic device and storage medium Download PDFInfo
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- CN115292807A CN115292807A CN202210837170.XA CN202210837170A CN115292807A CN 115292807 A CN115292807 A CN 115292807A CN 202210837170 A CN202210837170 A CN 202210837170A CN 115292807 A CN115292807 A CN 115292807A
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The present application provides a method, a system, an electronic device and a storage medium for determining damping of a battery pack, comprising: acquiring a vibration curve of the battery pack, and taking the upper limit values of a plurality of displacement response values in the vibration curve as actual displacement response values of the battery pack; determining an interpolation interval of a target damping value of the battery pack in the simulation data table based on the actual displacement response value; determining a fitting damping value of the battery pack in an interpolation interval by using an interpolation method; and correcting the fitted damping value to obtain a target damping value. The method and the device are favorable for accurately obtaining the target damping value of the battery pack, and further ensure the accuracy of the input parameters of the battery pack vibration response test.
Description
Technical Field
The application relates to the technical field of intelligent vehicle returning, in particular to a method and a system for determining damping of a battery pack, electronic equipment and a storage medium.
Background
The power battery pack is used as an energy storage component of the electric automobile, the charging and discharging tests are required to be completed under the conditions of temperature change, vibration, impact and the like before the power battery pack is put into use, and the battery pack is optimized according to the test results, so that the requirements of mechanical bearing, working safety and reliability under variable operating environments and driving working conditions can be met by the battery pack. Specifically, during the test process of the battery pack, the battery pack is usually subjected to simulation of two working conditions, namely steady-state random vibration and instant impact, structural damage of the battery pack caused by vibration is analyzed from the perspective of stress values, and the response condition of an internal electric contact point of the battery pack in a vibration environment is described from the perspective of acceleration.
Obviously, in the vibration response test of the battery pack, the test result of the battery pack has important significance on the optimization of the structural performance of the battery pack. The damping of the battery pack is used as an important parameter for the vibration response test, and the accuracy of the damping of the battery pack inevitably affects the precision of the test result of the battery pack, but an effective and accurate method for determining the damping value of the battery pack is not provided in the related art, so that the precision of the test result of the battery pack cannot be ensured.
Disclosure of Invention
The present application is directed to solving, at least in part, one of the technical problems in the related art. Therefore, an object of the present application is to provide a method, a system, an electronic device, and a storage medium for determining damping of a battery pack, where an interpolation method is used to determine a fitting damping value of the battery pack, and the fitting damping value is corrected to finally obtain a target damping value with higher accuracy, so as to ensure accuracy of an input parameter of a vibration response test of the battery pack.
One aspect of the present application provides a method of determining damping of a battery pack, which may include: acquiring a vibration curve of a battery pack, and taking upper limit values of a plurality of displacement response values in the vibration curve as actual displacement response values of the battery pack; determining an interpolation interval of a target damping value of the battery pack in a simulation data table based on the actual displacement response value; determining a fitting damping value of the battery pack in the interpolation interval by using an interpolation method; and correcting the fitting damping value to obtain the target damping value.
In some embodiments, the determining an interpolation interval of the target damping value of the battery pack in a simulation data table based on the actual displacement response value may include: performing descending arrangement on the actual displacement response value and a plurality of displacement simulation values in the simulation data table to obtain a descending arrangement table; extracting a first displacement simulation value and a second displacement simulation value adjacent to the actual displacement response value from the descending sequence list; and taking an interval between a first endpoint damping value corresponding to the first displacement simulation value and a second endpoint damping value corresponding to the second displacement simulation value as an interpolation interval of the target damping value of the battery pack.
In some embodiments, the determining the fitted damping value of the battery pack in the interpolation interval by using an interpolation method may include: extracting a first displacement simulation value corresponding to the first endpoint damping value and a second displacement simulation value corresponding to the second endpoint damping value respectively in the simulation data table to obtain a first analog number pair consisting of the first endpoint damping value and the first displacement simulation value and a second analog number pair consisting of the second endpoint damping value and the second displacement simulation value; determining the fitting slope of a straight line where the first fitting number pair and the second fitting number pair are located to construct a fitting function comprising the first fitting number pair and the second fitting number pair; and calculating a corresponding fitting damping value of the actual displacement response value in the fitting function.
In some embodiments, the modifying the fitted damping value to obtain the target damping value may include: calculating a displacement simulation value corresponding to the fitting damping value by using a finite element model, and acquiring a simulation number pair consisting of the fitting damping value and the displacement simulation value corresponding to the fitting damping value; constructing a simulation function comprising the simulation number pair based on the fitting slope and the simulation number pair; and calculating a target damping value corresponding to the actual displacement response value in the simulation function by using the simulation function.
In some embodiments, before obtaining the vibration curve of the battery pack and using the upper limit value of the plurality of displacement response values in the vibration curve as the actual displacement response value of the battery pack, the method may include: acquiring the simulation vibration frequency of the finite element model; and when the error between the simulated vibration frequency and the actual vibration frequency of the target vehicle is smaller than a frequency error threshold value, generating a simulation performance qualified result of the finite element model.
In some embodiments, before obtaining the vibration curve of the battery pack and using the upper limit value of the plurality of displacement response values in the vibration curve as the actual displacement response value of the battery pack, the method may include: in a preset sampling range, analyzing and processing a plurality of damping values of a preset gradient by using the finite element model to obtain displacement simulation values corresponding to the damping values; and integrating each damping value and the corresponding displacement simulation value thereof to obtain a simulation data table, wherein the simulation data table is composed of a plurality of groups of damping values and displacement simulation values with corresponding relations.
In some embodiments, after the correcting the fitted damping value to obtain the target damping value, the method may include: analyzing the target damping value by a finite element model to obtain a displacement simulation value corresponding to the target damping value; and calculating an error value between the displacement simulation value corresponding to the target damping value and the actual displacement response value, and generating a verification qualified result of the target damping value when the error value is smaller than a displacement error threshold value.
Another aspect of the present application provides a system for determining battery pack damping, which may include: the device comprises an actual displacement response value determining module, an interpolation interval determining module, a fitting damping value extracting module and a correcting module. The actual displacement response value determining module is used for acquiring a vibration curve of the battery pack and taking the upper limit values of a plurality of displacement response values in the vibration curve as the actual displacement response values of the battery pack. And the interpolation interval determination module is used for determining the interpolation interval of the target damping value of the battery pack in a simulation data table based on the actual displacement response value. And the fitting damping value extraction module is used for determining the fitting damping value of the battery pack in the interpolation interval by utilizing an interpolation method. And the correction module is used for correcting the fitting damping value to obtain the target damping value.
Yet another aspect of the present application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for determining battery pack damping as described in any of the above embodiments.
A further aspect of the present application provides a storage medium storing a computer program adapted to be loaded by a processor to perform the steps of the method for determining battery pack damping as described in any of the above embodiments.
According to the technical scheme of the embodiment, at least the following beneficial effects can be obtained.
According to the method and the system for determining the damping of the battery pack, the electronic device and the storage medium, the fitting damping value of the battery pack is determined by using an interpolation method, the fitting damping value is corrected, and the target damping value with high precision is finally obtained.
Drawings
FIG. 1 is a flow chart of a method of determining battery pack damping according to one aspect of the present application;
FIG. 2 is a schematic illustration of an interpolation interval for a target damping value in accordance with an aspect of the subject application;
FIG. 3 is a block diagram of a system for determining battery pack damping according to another aspect of the present application;
FIG. 4 is a schematic diagram of an electronic device architecture according to yet another aspect of the present application; and
FIG. 5 is a schematic diagram of a storage medium structure according to yet another aspect of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification the expressions first, second, third etc. are only used to distinguish one feature from another, and do not indicate any limitation of features, in particular any order of precedence. Thus, a first class of documents discussed in this application may also be referred to as a second class of documents and a first class of documents may also be referred to as a second class of documents and vice versa without departing from the teachings of this application.
In the drawings, the thickness, size, and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than merely individual elements of the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to examples or illustrations.
Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the methods described herein are not necessarily limited to the order described, but can be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a flow chart of a method of determining battery pack damping according to one aspect of the present application.
As shown in fig. 1, one aspect of the present application provides a method of determining damping of a battery pack, which may include: step S110, obtaining a vibration curve of the battery pack, and taking the upper limit values of a plurality of displacement response values in the vibration curve as actual displacement response values of the battery pack; step S120, determining an interpolation interval of a target damping value of the battery pack in a simulation data table based on the actual displacement response value; step S130, determining a fitting damping value of the battery pack in an interpolation interval by using an interpolation method; and step S140, correcting the fitting damping value to obtain a target damping value.
In some embodiments, the battery pack includes an upper cover and a lower case, and the damping test is performed on the battery pack as a whole in this application, but any one of the upper cover and the lower case of the battery pack may be selected as the damping detection object, and is not limited herein.
In some embodiments, a finite element model is used as a vibration response simulation model of the battery pack to obtain a displacement simulation value corresponding to any input damping value. In the subsequent process, the finite element model is required to be used for obtaining a plurality of displacement simulation values corresponding to each damping value in the simulation data table, the finite element model is required to be used for verifying the accuracy of the finally obtained target damping value of the battery pack, and the like, so that the accuracy of the finite element model output data is required to be ensured. Based on this, a vibration curve of the battery pack in the target vehicle is first determined, and the actual vibration frequency of the target vehicle in which the battery pack is located is determined from the vibration curve. Further, acquiring the simulated vibration frequency of the finite element model, comparing the simulated vibration frequency with the actual vibration frequency, and when the error between the simulated vibration frequency of the finite element model and the actual vibration frequency of the target vehicle in the experimental road condition is smaller than the frequency error threshold value, proving that the simulation performance of the finite element model is qualified, and generating a result that the simulation performance of the finite element model is qualified. On the contrary, if the error between the simulated vibration frequency of the finite element model and the actual vibration frequency of the target vehicle in the experimental road condition is greater than or equal to the frequency error threshold, the simulation performance of the finite element model is proved to be poor, and a result that the simulation performance of the finite element model is unqualified is generated. When the simulation performance of the finite element model is poor, each weight in the finite element model needs to be corrected and optimized until the error between the simulated vibration frequency and the vibration frequency of the target vehicle under the actual road condition is smaller than the frequency error threshold value, and the finite element model can be started. For example, the actual vibration frequency of the target vehicle carrying the battery pack under the experimental road condition is 37.12 hz, and the simulated vibration frequency of the finite element model is 36.25 hz, and the error between the actual vibration frequency and the simulated vibration frequency is 2.3% which is less than the frequency error threshold value of 5% can be obtained through calculation, so that the simulation result of the finite element model is credible, and the finite element model can be used for subsequent simulation calculation. Of course, the specific value of the frequency error threshold may be adjusted according to the precision required by the user, and is not limited herein.
In some embodiments, a plurality of displacement response values of the battery pack are obtained in a frequency sweep interval of 1 Hz to 100 Hz and an excitation amplitude range of 1G according to a vibration curve of the battery pack in the target vehicle, and the upper limit of the displacement response value of the battery pack is used as an actual displacement response value of the battery pack. For example, the actual displacement response value may be 1.8 millimeters. Of course, the range of the sweep frequency interval and the range of the excitation amplitude can be set according to requirements, and are not limited herein.
In some embodiments, after the actual displacement response value of the battery pack is obtained, a sweep interval of 1 hz to 100 hz and an excitation amplitude range of 1G are selected to obtain a plurality of simulated displacement values of the battery pack. Specifically, in a preset sampling range, a plurality of damping values of a preset gradient are analyzed and processed by using a finite element model, and a displacement simulation value corresponding to each damping value is obtained. Specifically, a preset sampling range of the damping value is 0.01 to 0.04, a sampling gradient is 0.01, that is, 0.01, 0.02, 0.03 and 0.04 are respectively used as the input of the damping value of the finite element model, the finite element model respectively processes and analyzes each damping value, and then the displacement simulation value corresponding to each damping value is output. Specifically, when the damping value is 0.01, the displacement simulation value output by the finite element model is 6.632 millimeters; when the damping value is 0.02, the displacement simulation value output by the finite element model is 4.059 mm; when the damping value is 0.03, the displacement simulation value output by the finite element model is 2.472 millimeters; when the damping value is 0.04, the finite element model outputs a displacement simulation value of 1.604 mm. Of course, the sampling range and the sampling gradient of the damping value can be adjusted according to the precision requirement, and are not limited herein.
In some embodiments, the plurality of damping values sampled at the preset gradient within the preset sampling range and the displacement simulation values corresponding to the respective damping values are integrated to generate a simulation data table including a plurality of sets of corresponding damping values and displacement simulation values.
In some embodiments, based on the selection of the damping values with the preset gradient in the preset sampling range and the determination of the displacement simulation value corresponding to each damping value, it can be seen that the displacement simulation value of the battery pack decreases as the damping value increases; in other words, the displacement simulation value shows a monotonically decreasing trend as the damping value increases. Further, the actual displacement response values of the battery pack and the displacement response values in the simulation data table are sorted in a descending order to obtain a descending order list. Further, two displacement simulation values adjacent to the actual displacement response value are extracted according to the position of the actual displacement response value in the descending order list and defined as a first displacement simulation value and a second displacement simulation value. Furthermore, the damping value corresponding to the first simulation value is determined in the simulation data table as a first endpoint damping value, the damping value corresponding to the second simulation value is determined in the simulation data table as a second endpoint damping value, and finally, an interval between the first endpoint damping value and the second endpoint damping value is used as an interpolation interval of the target damping value of the battery pack. For example, when the actual displacement response value is 1.8 mm, the actual displacement response value is between 2.472 mm and 1.604 mm in the simulation data table, i.e. let 2.472 mm be the first displacement simulation value and let 1.604 mm be the second displacement simulation value, and then the interpolation interval of the target damping value corresponding to the obtained actual displacement response value is 0.03 to 0.04.
In some embodiments, the fit damping value of the battery pack is determined in the interpolation interval using interpolation based on the interpolation interval of the target damping value of the battery pack. Specifically, since the displacement simulation value has a tendency of monotonically decreasing with an increase in the damping value, an inverse proportional function may be preliminarily set as a fitting function between the displacement simulation value and the corresponding damping value. First, a first displacement simulation value corresponding to a first endpoint damping value and a second displacement simulation value corresponding to a second endpoint damping value are respectively extracted from a simulation data table to obtain a first analog number pair composed of the first endpoint damping value and the first displacement simulation value and a second analog number pair composed of the second endpoint damping value and the second displacement simulation value. Further, the first fitting number pair and the second fitting number pair are used for determining the fitting slope of the straight line of the inverse proportion function. Furthermore, since the fitting function is an inverse proportional function, after the fitting slope is obtained, the fitting function with the fitting slope can be constructed, and the actual displacement response value of the battery pack is brought into the fitting function, so that the fitting damping value corresponding to the actual displacement response value in the fitting function can be obtained.
Specifically, the inverse scaling function may be: y = γ X + α, (1)
In formula (1), Y is a displacement simulation value, X is a damping value, γ is a fitting slope, and α is a fitting parameter.
In some embodiments, the first simulated displacement value is 2.472 mm, the second simulated displacement value is 1.604 mm, the first end point damping value corresponding to the first simulated displacement value is 0.03, and the second end point damping value corresponding to the second simulated displacement value is 0.04, based on which the fitting slope γ can be obtained 1 = -86.8, fitting parameter α 1 =5.076, and then can obtainThe fitting function is obtained as: y = -86.8X +5.076. Further, substituting the actual displacement response value of the battery pack of 1.8 mm into the fitting function described above may result in a fitted damping value of about 0.0376.
In some embodiments, although the displacement simulation value shows a monotonically decreasing trend as the damping value increases, the displacement simulation value and the damping value do not have a linear inverse relationship, so that an error exists between the fitted damping value obtained by using the fitting function and the target damping value, and the fitted damping value needs to be corrected to obtain the target damping value with reliability.
Specifically, a displacement simulation value corresponding to the fitting damping value is calculated by using a finite element model, and a simulation number pair consisting of the fitting damping value and the displacement simulation value corresponding to the fitting damping value is obtained. Further, based on the fitting slope and the simulation number pair, simulation parameters are determined, and then a simulation function comprising the simulation number pair is constructed. And finally, calculating a target damping value corresponding to the actual displacement response value in the simulation function by using the simulation function.
Fig. 2 is a block diagram of a system for determining battery pack damping according to another aspect of the present application.
In order to visually demonstrate the correction process of the fitting damping value, as shown in fig. 2, a spatial coordinate system of a damping value X and a displacement simulation value Y is constructed, where L1 is a fitting line segment corresponding to the fitting function, and L2 is a simulation line segment corresponding to the simulation function. Specifically, point E characterizes the first endpoint damping value X E And the first shift simulation value form Y E Point F represents the damping value X from the first endpoint F And a first simulated value of displacement constituting Y F A second simulation number pair, point A, characterized by an actual displacement response value Y A And fitting the damping value X A And forming interpolation number pairs. Further, the response value Y is responded to due to the actual displacement of the point A A Knowing the fitted damping value X of point A A Substituting the finite element model to obtain a fitting damping value X A Corresponding simulated values of displacement, e.g. when fitting a damping value X A At 0.0376, the simulated displacement value corresponding to the fitting damping value may be 1.758 mm, which is defined by the fitting damping value X A Corresponding displacement simulation value and fitting damping value X A The constructed number pair is a simulation number pair whose mapping point in the coordinate system shown in fig. 2 is a point C. Further, the fitting slope gamma of the fitting function is used 1 Value of = -86.8 as value of simulation slope of simulation function, i.e. γ 2 = -86.8; will simulate the slope gamma 2 And substituting the coordinate of the point C into the formula (1) to obtain alpha 2 =0.056, and the simulation function is obtained: y = -86.8X +5.056. Further, the actual displacement response value Y of the point A is compared A And substituting the actual displacement response value into the simulation function to obtain a target damping value corresponding to the actual displacement response value in the simulation function, namely the numerical value of the abscissa of the point B. In other words, the point of the simulation straight line L2 mapped by the point having the same actual displacement response value as the point a is the point B. If the actual displacement response value is 1.8 mm, the corresponding damping value of the actual displacement response value in the simulation function is about 0.0375, and the damping value is taken as the target damping value of the battery pack.
Of course, the target damping value corresponding to the point B can also be obtained by using the principle of similar triangle, specifically, since the coordinate of the point C and the coordinate of the point a are known, the side length of a right-angle side AC in Δ ABC is the difference between the ordinate of the point a and the ordinate of the point C, that is, 1.8-1.758=0.042 mm; the side length of another right-angle side AB of the delta ABC is an interpolation value between the abscissa of the point A and the abscissa of the point B, but the abscissa of the point B is unknown, namely the value of the abscissa of the point B is set as X B The side length of AB is 1.8-X B . The right angle Δ EFG is established in a rectangular coordinate system in fig. 2, a point G is taken as an intersection point of two right-angled sides of the Δ EFG, since slopes of L1 and L2 are equal, and based on a principle of similar triangles, tangent values of an angle ABC and the angle EFG are the same and are 86.8, that is, tan ═ ABC = tan ≦ EFG =86.8, and since a coordinate of the point E, a coordinate of the point F, a coordinate of the point G and a side length of the AC are known, a length of the side length AB can be obtained, which is about 0.000484 in the present application. Further, since the point a and the point B have the same ordinate value, the abscissa of the point B is the difference between the abscissa of the point a and the side length AB, i.e., X B =0.0376-0.000484 ≈ 0.0375, i.e. the target damping value is about 0.0375.
In some embodiments, since the point B is a point in the simulation function, and the corresponding target damping value is not the actual damping value of the battery pack, the target damping value needs to be verified. Specifically, the target damping value is substituted into the finite element model, the finite element model processes and analyzes the target damping value, a displacement simulation value corresponding to the target damping value is output, the displacement simulation value corresponding to the target damping value is compared with an actual displacement response value of the battery pack, an error value between the displacement simulation value corresponding to the target damping value and the actual displacement response value is calculated, and when the error value is smaller than a displacement error threshold value, a verification qualified result of the target damping value is generated. The displacement error threshold value can be 20%, and can also be adjusted according to the test precision. Of course, if the error value between the displacement simulation value corresponding to the target damping value and the actual displacement response value exceeds the displacement error threshold, the interpolation interval needs to be reselected until the error between the displacement simulation value and the actual displacement response value is controlled within the displacement error threshold, and the target damping value of the battery pack can be output.
According to the method for determining the damping of the battery pack, the fitting damping value of the battery pack is determined by using an interpolation method, the fitting damping value is corrected, and the target damping value with high precision is finally obtained.
Fig. 3 is a block diagram of a system for determining battery pack damping according to another aspect of the present application.
As shown in fig. 3, another aspect of the present application provides a battery pack damping determination system 200 that may include: an actual displacement response value determination module 210, an interpolation interval determination module 220, a fitted damping value extraction module 230, and a correction module 240. The actual displacement response value determining module 210 is configured to obtain a vibration curve of the battery pack, and use an upper limit value of a plurality of displacement response values in the vibration curve as an actual displacement response value of the battery pack. The interpolation interval determination module 220 is configured to determine an interpolation interval of the target damping value of the battery pack in a simulation data table based on the actual displacement response value. The fitting damping value extraction module 230 is configured to determine a fitting damping value of the battery pack in the interpolation interval by using an interpolation method. The correcting module 240 is configured to correct the fitted damping value to obtain the target damping value.
In some embodiments, the interpolation interval determination module 220 may perform the steps of: performing descending arrangement on the actual displacement response value and a plurality of displacement simulation values in the simulation data table to obtain a descending arrangement table; extracting a first displacement simulation value and a second displacement simulation value adjacent to the actual displacement response value from the descending sequence list; and taking an interval between a first endpoint damping value corresponding to the first displacement simulation value and a second endpoint damping value corresponding to the second displacement simulation value as an interpolation interval of the target damping value of the battery pack.
In some embodiments, the performing step of the fitting damping value extraction module 230 may include: respectively extracting a first displacement simulation value corresponding to the first endpoint damping value and a second displacement simulation value corresponding to the second endpoint damping value from a simulation data table to obtain a first analog number pair consisting of the first endpoint damping value and the first displacement simulation value and a second analog number pair consisting of the second endpoint damping value and the second displacement simulation value; determining the fitting slope of a straight line where the first fitting number pair and the second fitting number pair are located to construct a fitting function comprising the first fitting number pair and the second fitting number pair; and calculating a corresponding fitting damping value of the actual displacement response value in the fitting function.
In some embodiments, the performing step of the modification module 240 may include: calculating a displacement simulation value corresponding to the fitting damping value by using a finite element model, and acquiring a simulation number pair consisting of the fitting damping value and the displacement simulation value corresponding to the fitting damping value; constructing a simulation function comprising simulation number pairs based on the fitting slope and the simulation number pairs; and calculating a target damping value corresponding to the actual displacement response value in the simulation function by using the simulation function.
In some embodiments, a finite element model verification module (not shown) may be further included, operable to obtain a simulated vibration frequency of the finite element model; and when the error between the simulated vibration frequency and the actual vibration frequency of the target vehicle is smaller than the frequency error threshold value, generating a simulation performance qualified result of the finite element model.
In some embodiments, the system may further include a simulation data table generating module (not shown) configured to analyze a plurality of damping values of a preset gradient by using a finite element model in a preset sampling range to obtain a displacement simulation value corresponding to each damping value; and integrating the damping values and the corresponding displacement simulation values thereof to obtain a simulation data table, wherein the simulation data table consists of a plurality of groups of damping values and displacement simulation values with corresponding relations.
In some embodiments, a result verification module (not shown) may be further included, configured to analyze the target damping value by using the finite element model, and obtain a displacement simulation value corresponding to the target damping value; and calculating an error value between the displacement simulation value corresponding to the target damping value and the actual displacement response value, and generating a verification qualified result of the target damping value when the error value is smaller than a displacement error threshold value.
Fig. 4 is a schematic diagram of an electronic device according to yet another aspect of the present application. As shown in fig. 4, according to yet another aspect of the present application, there is also provided an electronic device 300. The electronic device 300 may include one or more processors and one or more memories. Wherein the memory has stored therein computer readable code which, when executed by the one or more processors, may perform the method of determining battery pack damping as described above.
The method or system according to embodiments of the present application may also be implemented by means of the architecture of the electronic device shown in fig. 4. As shown in fig. 4, the electronic device 300 may include a bus 301, one or more CPUs 302, a Read Only Memory (ROM) 303, a Random Access Memory (RAM) 304, a communication port 305 connected to a network, an input/output component 306, a hard disk 307, and the like. A storage device in the electronic device 300, such as the ROM303 or the hard disk 307, may store the battery pack damping determination method provided herein. The method for determining the damping of the battery pack can comprise the steps of acquiring a vibration curve of the battery pack, and taking an upper limit value of a plurality of displacement response values in the vibration curve as an actual displacement response value of the battery pack; determining an interpolation interval of a target damping value of the battery pack in the simulation data table based on the actual displacement response value; determining a fitting damping value of the battery pack in an interpolation interval by using an interpolation method; and correcting the fitted damping value to obtain a target damping value. Further, the electronic device 300 may also include a user interface 308. Of course, the architecture shown in fig. 4 is merely exemplary, and one or more components of the electronic device shown in fig. 4 may be omitted as needed in implementing different devices.
FIG. 5 is a schematic diagram of a computer-readable storage medium structure according to yet another aspect of the present application. As shown in fig. 5, a computer-readable storage medium 400 according to an embodiment of the present application. The computer-readable storage medium 400 has computer-readable instructions stored thereon. The method of determining battery pack damping according to embodiments of the present application described with reference to the above figures may be performed when the computer readable instructions are executed by a processor. The storage medium 400 includes, but is not limited to, volatile memory and/or non-volatile memory, for example. Volatile memory can include, for example, random Access Memory (RAM), cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), a hard disk, flash memory, and the like.
In addition, according to an embodiment of the present application, the processes described above with reference to the flowcharts may be implemented as a computer software program. For example, the present application provides a non-transitory machine-readable storage medium having stored thereon machine-readable instructions executable by a processor to perform instructions corresponding to the method steps provided herein, such as: acquiring a vibration curve of the battery pack, and taking the upper limit values of a plurality of displacement response values in the vibration curve as actual displacement response values of the battery pack; determining an interpolation interval of a target damping value of the battery pack in the simulation data table based on the actual displacement response value; determining a fitting damping value of the battery pack in an interpolation interval by using an interpolation method; and correcting the fitted damping value to obtain a target damping value. The computer program performs the above-mentioned functions defined in the method of the present application when executed by a Central Processing Unit (CPU).
The method and apparatus, device of the present application may be implemented in a number of ways. For example, the methods and apparatuses, devices of the present application may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present application are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present application may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present application. Thus, the present application also covers a recording medium storing a program for executing the method according to the present application.
In addition, parts of the above technical solutions provided in the embodiments of the present application that are consistent with the implementation principle of the corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.
The above description is only an embodiment of the present application and an illustration of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A method of determining battery pack damping, comprising:
acquiring a vibration curve of a battery pack, and taking upper limit values of a plurality of displacement response values in the vibration curve as actual displacement response values of the battery pack;
determining an interpolation interval of a target damping value of the battery pack in a simulation data table based on the actual displacement response value;
determining a fitting damping value of the battery pack in the interpolation interval by using an interpolation method; and
and correcting the fitted damping value to obtain the target damping value.
2. The method for determining battery pack damping according to claim 1, wherein the determining an interpolation interval of the target damping value of the battery pack in a simulation data table based on the actual displacement response value comprises:
performing descending arrangement on the actual displacement response value and a plurality of displacement simulation values in the simulation data table to obtain a descending arrangement table;
extracting a first displacement simulation value and a second displacement simulation value adjacent to the actual displacement response value from the descending order arrangement table; and
and taking an interval between a first endpoint damping value corresponding to the first displacement simulation value and a second endpoint damping value corresponding to the second displacement simulation value as an interpolation interval of the target damping value of the battery pack.
3. The method for determining damping of a battery pack according to claim 2, wherein the determining the fitted damping value of the battery pack in the interpolation interval by using an interpolation method comprises:
extracting a first displacement simulation value corresponding to the first endpoint damping value and a second displacement simulation value corresponding to the second endpoint damping value respectively in the simulation data table to obtain a first analog number pair consisting of the first endpoint damping value and the first displacement simulation value and a second analog number pair consisting of the second endpoint damping value and the second displacement simulation value;
determining the fitting slope of the straight line where the first fitting number pair and the second fitting number pair are located so as to construct a fitting function comprising the first fitting number pair and the second fitting number pair; and
and calculating a corresponding fitting damping value of the actual displacement response value in the fitting function.
4. The method for determining battery pack damping according to claim 3, wherein the modifying the fitted damping value to obtain the target damping value comprises:
calculating a displacement simulation value corresponding to the fitting damping value by using a finite element model, and acquiring a simulation number pair consisting of the fitting damping value and the displacement simulation value corresponding to the fitting damping value;
constructing a simulation function comprising the simulation number pair based on the fitting slope and the simulation number pair; and
and calculating a target damping value corresponding to the actual displacement response value in the simulation function by using the simulation function.
5. The method for determining the damping of the battery pack according to claim 1, wherein before the obtaining the vibration curve of the battery pack and using the upper limit values of the plurality of displacement response values in the vibration curve as the actual displacement response values of the battery pack, the method comprises:
acquiring the simulation vibration frequency of the finite element model; and
and when the error between the simulated vibration frequency and the actual vibration frequency of the target vehicle is smaller than a frequency error threshold value, generating a simulation performance qualified result of the finite element model.
6. The method for determining damping of a battery pack according to claim 5, wherein before obtaining a vibration curve of the battery pack and using upper limit values of a plurality of displacement response values in the vibration curve as actual displacement response values of the battery pack, the method comprises:
in a preset sampling range, analyzing and processing a plurality of damping values of a preset gradient by using the finite element model to obtain displacement simulation values corresponding to the damping values; and
and integrating each damping value and the corresponding displacement simulation value thereof to obtain a simulation data table, wherein the simulation data table consists of a plurality of groups of damping values and displacement simulation values with corresponding relations.
7. The method of determining battery pack damping according to claim 1, after said modifying the fitted damping value to obtain the target damping value, comprising:
analyzing the target damping value by a finite element model to obtain a displacement simulation value corresponding to the target damping value; and
and calculating an error value between the displacement simulation value corresponding to the target damping value and the actual displacement response value, and generating a verification qualified result of the target damping value when the error value is smaller than a displacement error threshold value.
8. A system for determining battery pack damping, comprising:
the actual displacement response value determining module is used for acquiring a vibration curve of the battery pack and taking the upper limit values of a plurality of displacement response values in the vibration curve as the actual displacement response values of the battery pack;
an interpolation interval determination module, configured to determine, based on the actual displacement response value, an interpolation interval of a target damping value of the battery pack in a simulation data table;
the fitting damping value extraction module is used for determining a fitting damping value of the battery pack in the interpolation interval by using an interpolation method; and
and the correction module is used for correcting the fitted damping value to obtain the target damping value.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor when executing the program implementing the steps in the method of determining battery pack damping as claimed in any one of claims 1 to 7.
10. A storage medium storing a computer program adapted to be loaded by a processor for performing the steps of the method for determining battery pack damping according to any of claims 1-7.
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| CN202210837170.XA CN115292807A (en) | 2022-07-15 | 2022-07-15 | Method and system for determining damping of battery pack, electronic device and storage medium |
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| CN202210837170.XA CN115292807A (en) | 2022-07-15 | 2022-07-15 | Method and system for determining damping of battery pack, electronic device and storage medium |
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