CN111523193A - CAE battery module connection structure equivalent model based establishment method - Google Patents
CAE battery module connection structure equivalent model based establishment method Download PDFInfo
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- CN111523193A CN111523193A CN201910039733.9A CN201910039733A CN111523193A CN 111523193 A CN111523193 A CN 111523193A CN 201910039733 A CN201910039733 A CN 201910039733A CN 111523193 A CN111523193 A CN 111523193A
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Abstract
The application discloses a CAE battery module connection structure equivalent model-based establishing method, which comprises the following steps: 1) establishing an accurate model of a battery module connecting structure, and carrying out simulation tests of axial compression and radial overturning deflection on the accurate model; 2) establishing an equivalent model, and carrying out the same simulation test of axial compression and radial overturning deflection on the accurate model; 3) and comparing the difference of the reaction forces of the parallel-connection elastic sheets in the two model simulation tests, and adjusting the parameters of the anisotropic material applied to the series-connection elastic sheet equivalent body in the equivalent model according to the difference until the difference of the reaction forces of the parallel-connection elastic sheets in the two model simulation tests is reduced to an ideal range. By adopting the method to establish the equivalent model, the simulation error can be reduced in the finite element simulation process in the later period, and the simulation efficiency of the battery connection structure and the whole battery pack can be greatly improved.
Description
Technical Field
The application relates to the field of batteries, in particular to an establishment method based on a CAE battery module connecting structure equivalent model.
Background
In recent years, with the strong support of the nation, the new energy automobile industry is rapidly developed. The reliability of the internal module structure of the new energy battery pack has also become a focus of wide attention at present, and the rigidity characteristic of the internal module connecting structure and the input mode in the finite element simulation process are always one of the more focused hotspots in the industry.
At present, battery packs grouped by cylindrical battery cells are complex, and particularly, a connection structure between two battery cells is the most important part of the reliability of a battery module. At present, the cylindrical battery core is mainly connected by eight-claw elastic pieces (series elastic pieces), and pretightening force is applied to the battery core, so that the purpose of fixing the battery core and the whole module is achieved. In the finite element simulation process, because the connection structure is more complicated and the number of parts is more, all the characteristics cannot be calculated in the modeling process, the connection part needs to be equivalent to the corresponding structure, so that the calculation accuracy is ensured, the calculation efficiency is greatly improved, and from the experimental angle, the characteristic parameters of the link structure cannot be accurately and efficiently tested, so that the simulation analysis must be carried out by a CAE (computer aided engineering) simulation means, and the accuracy of the finite element analysis of the whole battery pack is ensured.
The traditional processing method for analyzing the connection structure of the battery pack CAE comprises the following steps: in order to reduce the calculation time and improve the calculation efficiency, engineers often replace the quality of the module by using quality points, and the method has the defects that the module characteristics cannot be accurately mapped onto the battery box body, and only the quality is separately distributed; the module is composed of parts such as a battery core, a clamp, an eight-claw spring plate and the like, the simplified material parameters are necessarily anisotropic materials, so that the anisotropic materials are only replaced by three parameters, calculation errors are inevitably increased, and simulation calculation of the battery pack is not facilitated.
Disclosure of Invention
The purpose of the application is: aiming at the problems, the establishment method based on the CAE battery module connecting structure equivalent model is provided, so that the simulation error can be reduced in the finite element simulation process in the later period, and the simulation efficiency of the battery connecting structure and the whole pack thereof is greatly improved.
The technical scheme of the application is as follows:
a CAE battery module connection structure-based equivalent model establishing method comprises the following steps:
1) establishing an accurate model of a battery module connecting structure, wherein the accurate model comprises the following steps: the system comprises a left electric core accurate body, a right electric core accurate body, a series connection elastic sheet accurate body and a control device, wherein the left electric core accurate body and the right electric core accurate body are coaxially arranged in a left-right mode and are of cylindrical structures, the series connection elastic sheet accurate body is positioned between the left electric core accurate body and the right electric core accurate body, the material attributes are applied to the left electric core accurate body, the right electric core accurate body and the series connection elastic sheet accurate body, the left electric core accurate body is set to be fixed in position, and the deformation amount of the series connection elastic sheet accurate body and the reaction force I applied to the right electric core accurate body by the series connection elastic sheet accurate body are calculated when the right electric core accurate body and the axis of the left electric;
2) establishing an equivalent model corresponding to the accurate model, wherein the equivalent model comprises: the system comprises a left cell equivalent body, a right cell equivalent body, a series connection elastic sheet equivalent body, a left cell equivalent body, a right cell equivalent body, a series connection elastic sheet equivalent body and a right cell equivalent body, wherein the left cell equivalent body and the right cell equivalent body are coaxially arranged in a left-right mode and are of cylindrical structures;
3) comparing the reaction force I with the reaction force II;
if the difference value of the reaction force I and the reaction force II is within the ideal range, the establishment of the equivalent model is completed;
if the difference between the reaction force I and the reaction force II is out of the ideal range, the following step 4) is carried out;
4) adjusting anisotropic material parameters applied to the series elastic sheet equivalent body in the equivalent model to obtain the deformation of the series elastic sheet equivalent body and the reaction force III applied to the right electric core equivalent body by the series elastic sheet equivalent body when the axis of the right electric core equivalent body and the axis of the left electric core equivalent body form an included angle of X degrees and move leftwards by Y millimeters, and comparing the reaction force I with the reaction force III;
if the difference value of the first reaction force I and the third reaction force III is within an ideal range, the establishment of the equivalent model is completed;
and if the difference value of the first reaction force I and the third reaction force III is out of the ideal range, adjusting the anisotropic material parameters applied to the series elastic sheet equivalent body in the equivalent model again until the difference value of the reaction force of the series elastic sheet equivalent body and the reaction force I is within the ideal range when the axis of the right cell equivalent body and the axis of the left cell equivalent body in the established equivalent model move leftwards by Y millimeters under the condition of an X-degree included angle.
On the basis of the technical scheme, the application also comprises the following preferable scheme:
the parameters of the anisotropic material applied to the equivalent body of the series elastic sheet comprise elastic modulus E in the x directionxElastic modulus E in the y-directionyZ-direction elastic modulus EzPoisson ratio μ of yz planeyzPoisson's ratio mu in xy planexyZx plane poisson ratio muzxShear modulus G in the xy planexyShear modulus G in yz planeyzZx plane shear modulus Gzx。
In the step 1), the precise model further comprises a battery support precise body.
In the step 1), adjusting the values of X and Y to obtain a plurality of reaction forces I;
in the step 2), a plurality of the reaction forces II corresponding to the reaction forces I are obtained;
in the step 3), comparing each pair of the reaction force I and the reaction force II respectively until the difference value of each pair of the reaction force I and the reaction force II is within an ideal range, and establishing an equivalent model; otherwise, adjusting anisotropic material parameters applied to the series elastic sheet equivalent body in the equivalent model until the difference value of each pair of the reaction force I and the reaction force II is within an ideal range.
The series elastic sheet equivalent body in the equivalent model is of a cylindrical structure.
The application has the advantages that:
1. deeply analyzing the characteristics of the battery module connecting structure.
2. The model is simplified, and the simulation efficiency is greatly improved.
3. And the simulation error of the whole packet is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a perspective view of an accurate model in an embodiment of the present application;
FIG. 2 is a front view of an accurate model in an embodiment of the present application;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a schematic diagram of a simulation test performed on an accurate model according to an embodiment of the present application;
FIG. 5 is a schematic perspective view of an equivalent model in an embodiment of the present application;
FIG. 6 is a front view of an equivalent model in an embodiment of the present application;
FIG. 7 is a left side view of FIG. 6;
wherein: 1-left cell exact body, 2-series shrapnel exact body, 3-right cell exact body, 4-battery support exact body, 5-parallel network exact body, 10-left cell equivalent body, 20-series shrapnel equivalent body, and 30-right cell equivalent body.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.
One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.
Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
The method for establishing the equivalent model based on the CAE battery module connecting structure comprises the following steps:
1) firstly, an accurate model of the battery module connecting structure is established by utilizing modeling software. Referring to fig. 1 to 3, the accurate model index includes: a left cell accurate body 1 and a right cell accurate body 3 which are coaxially arranged at the left and the right and have a cylindrical structure, and a series elastic sheet accurate body 2 which is positioned between the left cell accurate body and the right cell accurate body.
In this accurate model, use fig. 2 as the reference, the accurate body 2 of series connection shell fragment is eight claw shell fragment structures, and it includes a circular shape film and from this film outer fringe department an organic whole eight bullet claws that extend left, each bullet claw encircles film interval distribution, and holds the right-hand member portion elasticity of left electric core tightly, and the middle part of film is integrative to be formed with the protruding boss of going to the right side, and left electric core 1 and right electric core 3 lean on respectively to arrange in the left and right sides of film.
Then, in the precise model, material properties are applied to the left cell precise body 1, the right cell precise body 3, and the series-connected leaf spring precise body 2. The position of the left electric core accurate body 1 is fixed (boundary condition setting), software is directly utilized or manual calculation is carried out to obtain the reaction force I applied to the right electric core accurate body 3 after the right electric core accurate body 3 and the right electric core accurate body 2 generate the deformation amount when the right electric core accurate body 3 moves leftwards by Y millimeters under the state that the axis of the right electric core accurate body 3 and the axis of the left electric core accurate body 1 form an X-degree included angle (namely the right electric core accurate body 3 generates radial angle deflection). As shown in fig. 4. The values of X and Y mentioned above are generally very small and X and Y may take on values of zero.
Specifically, when the right cell precision body 3 moves Y millimeters left in a state that the axis of the right cell precision body 3 and the axis of the left cell precision body 1 form an X-degree included angle, the boss on the film is elastically deformed, and thus the reaction force i is only related to the deformation of the boss. The simulation method is a simulation of a practical application scene of the battery connection structure: in the practical use process of the battery module, the deflection of the X angle and the movement of the Y stroke can occur due to the fact that the battery core is subjected to various axial external forces and radial external forces, and the deflection and the movement can extrude the battery serial sheets to cause the deformation of the battery serial sheets.
Of course, other components of the battery module connection structure can be added to the precise model, such as: battery support (also called battery anchor clamps, its inside has electric core cartridge hole, and the accurate body 2 of above-mentioned series connection shell fragment inlays in electric core cartridge hole, and the right-hand member of the accurate body 1 of left electric core and the accurate body 3 left ends of right electric core all insert in electric core cartridge hole), and network etc.. In the figure, reference numeral 4 denotes a battery holder accurate body of the battery holder, and reference numeral 5 denotes a parallel network accurate body which is connected in parallel.
2) Then, an equivalent model corresponding to the precise model is built in modeling software, as shown in fig. 5 to 7, similar to the precise model, the equivalent model includes: a left cell equivalent body 10 and a right cell equivalent body 30 which are coaxially arranged at the left and the right and have a cylindrical structure, and a series elastic sheet equivalent body 20 which is positioned between the left cell equivalent body and the right cell equivalent body. The difference from the above accurate model is: the series shell equivalent 20 used to represent the series shell in the equivalent model is simply replaced with a cylinder, and the bottom sheet and shell structure of the series shell are not shown; and there is no equivalent representing a battery rack and parallel networking.
Then, anisotropic material parameters including the elastic modulus E in the x direction are applied (which can be directly written in software) to the left series elastic equivalent 20xElastic modulus E in the y-directionyZ-direction elastic modulus EzPoisson ratio μ of yz planeyzPoisson's ratio mu in xy planexyZx plane poisson ratio muzxShear modulus G in the xy planexyShear modulus G in yz planeyzZx plane shear modulus Gzx。
In the equivalent model, the left cell equivalent body 10 is set to be fixed in position through the boundary condition setting function, and the deformation of the series elastic sheet equivalent body 20 and the reaction force ii exerted by the series elastic sheet accurate body 20 on the right cell equivalent body 30 under the deformation when the right cell equivalent body 30 and the axis of the left cell equivalent body 10 form an included angle of X degrees and the right cell equivalent body 30 moves leftwards by Y millimeters are obtained.
3) The reaction force I and the reaction force II are compared.
And if the difference value of the reaction force I and the reaction force II is within the ideal range, establishing the equivalent model. Obviously, the smaller the difference between the reaction force I and the reaction force II is, the better the difference is, the closer the reaction force I and the reaction force II are, and the more accurate the established equivalent model is.
If the difference between the reaction force I and the reaction force II is too large, the difference between the reaction force I and the reaction force II is out of the ideal range, and the established equivalent model cannot meet the requirement, the following steps 4) are required,
4) The anisotropic material parameters applied to the series spring equivalent 20 in the equivalent model are adjusted, i.e. modified. And then, the left cell equivalent body 10 is set to be fixed in position through a boundary condition setting function, so that the deformation of the series elastic sheet equivalent body 20 and the reaction force iii generated by the series elastic sheet accurate body 20 when the right cell equivalent body 30 and the axis of the left cell equivalent body 10 move leftwards by Y millimeters under the state of forming an included angle of X degrees. Obviously, the parameters of the anisotropic material applied to the equivalent of the series elastic piece 20 are modified, so that the reaction force iii obtained at this time is necessarily different from the reaction force ii.
The reaction force i and the reaction force iii were compared.
If the difference value of the first reaction force I and the third reaction force III is found to be in an ideal range, the establishment of the equivalent model is completed.
And if the difference between the first reaction force i and the third reaction force iii is still outside the ideal range, modifying the anisotropic material parameter applied to the series elastic sheet equivalent body 20 in the equivalent model again until the difference between the reaction force applied to the right cell equivalent body 30 by the series elastic sheet equivalent body 20 and the reaction force i in the step 1) is within the ideal range when the axis of the right cell equivalent body 30 and the left cell equivalent body 10 in the established equivalent model moves leftward by Y millimeters under the condition of an included angle of X degrees.
Obviously, if the values of X and Y in step 1) above are only one set, only one value of reaction force i can be obtained, and only one value of reaction force ii can be correspondingly obtained in step 2). Only one group of data is compared, and the anisotropic material parameter error of the series elastic sheet equivalent body 20 in the determined equivalent model is large, so that the persuasion is not strong.
Therefore, the values of X and Y can be adjusted in step 1) many times, so as to obtain the reaction force generated by the accurate body 2 of the right cell in series connection with the accurate body of the shrapnel under various deflection angles (X) and various axial displacement amounts (Y), that is, a plurality of reaction forces i with different sizes can be obtained, and each reaction force i corresponds to a deformation state of the accurate body 2 of the series connection shrapnel.
In step 2), a plurality of reaction forces ii generated by the right cell equivalent body and the series connection spring equivalent body 20 under the same deflection angle and the same axial displacement are correspondingly obtained, and the obtained reaction forces ii correspond to (but are not necessarily equal to) the reaction forces i.
In the step 3), the difference values of each pair of the reaction force I and the reaction force II are respectively compared until the difference values of each pair of the reaction force I and the reaction force II are within an ideal range, and then the establishment of the equivalent model is completed. Otherwise, adjusting the parameters of the anisotropic material applied to the series elastic sheet equivalent body 20 in the equivalent model until the difference between each pair of the reaction force I and the reaction force II is within the ideal range.
The term "counterforce" refers to elastic deformation of the series elastic sheet due to the thrust of the right cell, and the elastic deformation causes the series elastic sheet to have an elastic force acting in the opposite direction on the outside (specifically, the right cell).
The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.
Claims (5)
1. A CAE battery module connection structure-based equivalent model establishing method is characterized by comprising the following steps:
1) establishing an accurate model of a battery module connecting structure, wherein the accurate model comprises the following steps: the device comprises a left electric core accurate body (1), a right electric core accurate body (3) and a series connection elastic sheet accurate body (2), wherein the left electric core accurate body and the right electric core accurate body are coaxially arranged in a left-right mode and are of cylindrical structures, the series connection elastic sheet accurate body (2) is positioned between the left electric core accurate body and the right electric core accurate body, material attributes are applied to the left electric core accurate body (1), the right electric core accurate body (3) and the series connection elastic sheet accurate body (2), the left electric core accurate body (1) is fixed in position, and the deformation amount of the series connection elastic sheet accurate body (2) and the reaction force I applied to the right electric core accurate body (3) by the series connection elastic sheet accurate body (2) when the right electric core accurate body (3) moves leftwards for Y millimeters under the state that the right electric core accurate body (3) and the;
2) establishing an equivalent model corresponding to the accurate model, wherein the equivalent model comprises: the left cell equivalent body (10) and the right cell equivalent body (30) which are coaxially arranged in a left-right mode and are of cylindrical structures, and the series connection spring plate equivalent body (20) located between the left cell equivalent body and the right cell equivalent body apply anisotropic material parameters to the left series connection spring plate equivalent body (20), the left cell equivalent body (10) is set to be fixed in position, and the deformation amount of the series connection spring plate equivalent body (20) and the reaction force II applied by the series connection spring plate equivalent body (20) to the right cell equivalent body (30) are obtained under the condition that the axis of the right cell equivalent body (30) and the axis of the left cell equivalent body (10) form an included angle of X degrees, when the right cell equivalent body (30) moves leftwards by Y millimeters;
3) comparing the reaction force I with the reaction force II;
if the difference value of the reaction force I and the reaction force II is within the ideal range, the establishment of the equivalent model is completed;
if the difference between the reaction force I and the reaction force II is out of the ideal range, the following step 4) is carried out;
4) adjusting anisotropic material parameters applied to the series elastic sheet equivalent body (20) in the equivalent model to obtain the deformation of the series elastic sheet equivalent body (20) and a reaction force III applied to the right electric core equivalent body (30) by the series elastic sheet equivalent body (20) when the axis of the right electric core equivalent body (30) and the axis of the left electric core equivalent body (10) form an included angle of X degrees and move leftwards by Y millimeters, and comparing the reaction force I with the reaction force III;
if the difference value of the first reaction force I and the third reaction force III is within an ideal range, the establishment of the equivalent model is completed;
if the difference value of the first reaction force I and the third reaction force III is out of the ideal range, adjusting the anisotropic material parameters applied to the series elastic sheet equivalent body (20) in the equivalent model again until the difference value of the reaction force applied to the right cell equivalent body (30) by the series elastic sheet equivalent body (20) and the reaction force I is in the ideal range when the axis of the right cell equivalent body (30) and the left cell equivalent body (10) in the established equivalent model moves leftwards by Y millimeters under the condition that the axis of the right cell equivalent body (30) and the axis of the left cell equivalent body (10) form an included angle of X degrees.
2. The CAE-based battery module connection structure equivalent model establishing method according to claim 1, wherein the anisotropic material parameters applied to the series elastic sheet equivalent body (20) comprise elastic modulus E in x directionxElastic modulus E in the y-directionyZ-direction elastic modulus EzPoisson ratio μ of yz planeyzPoisson's ratio mu in xy planexyZx plane poisson ratio muzxShear modulus G in the xy planexyShear modulus G in yz planeyzZx plane shear modulus Gzx。
3. The CAE battery module connecting structure equivalent model-based establishing method according to claim 1, characterized in that in the step 1), the accurate model further comprises a battery support accurate body (4).
4. The CAE battery module connection structure-based establishment method according to claim 1,
in the step 1), adjusting the values of X and Y to obtain a plurality of reaction forces I;
in the step 2), a plurality of the reaction forces II corresponding to the reaction forces I are obtained;
in the step 3), comparing each pair of the reaction force I and the reaction force II respectively until the difference value of each pair of the reaction force I and the reaction force II is within an ideal range, and establishing an equivalent model; otherwise, adjusting anisotropic material parameters applied to the series elastic sheet equivalent body (20) in the equivalent model until the difference value of each pair of the reaction force I and the reaction force II is within an ideal range.
5. The CAE battery module connection structure-based establishment method according to claim 1, wherein the series elastic sheet equivalent body (20) in the equivalent model is of a cylindrical structure.
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| CN112149325A (en) * | 2020-08-28 | 2020-12-29 | 同济大学 | Finite element modeling method for flexibly-connected cylindrical cell battery module |
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| CN107330158A (en) * | 2017-06-08 | 2017-11-07 | 南京航空航天大学 | The equivalent radial rigidity recognition methods of bearing based on local fine contact model |
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| CN112149325A (en) * | 2020-08-28 | 2020-12-29 | 同济大学 | Finite element modeling method for flexibly-connected cylindrical cell battery module |
| CN112149325B (en) * | 2020-08-28 | 2023-03-28 | 同济大学 | Finite element modeling method for flexibly-connected cylindrical cell battery module |
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Application publication date: 20200811 |