CN111931312B - New energy automobile battery tray topological structure simulation test method and device - Google Patents
New energy automobile battery tray topological structure simulation test method and device Download PDFInfo
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Abstract
The embodiment of the invention provides a new energy automobile battery tray topological structure simulation test method and device, and relates to the technical field of battery pack simulation tests. The method comprises the following steps: acquiring initial structure parameters of the battery pack; constructing a first topological structure model of the battery tray based on the initial structure parameters of the battery pack; performing rigidity and strength simulation on the first topological structure model to obtain a second topological structure model of the battery tray; acquiring final structure parameters of the battery pack; and constructing a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and performing rigidity and strength simulation on the three-dimensional finite element model according to the final structure parameters of the battery pack to determine the final structure of the battery tray. When the design of the battery tray structure needs to be adjusted due to design change or power battery module updating, the invention can only slightly change the second topological structure model, thereby carrying out simulation test on the structural model of the battery tray to determine the final structure of the battery tray.
Description
Technical Field
The invention relates to the technical field of battery pack simulation test, in particular to a new energy automobile battery tray topological structure simulation test method and a new energy automobile battery tray topological structure simulation test device.
Background
The safety performance of the power battery pack is determined to a great extent by the safety performance of the power battery pack as an important component of a pure electric vehicle, the battery tray bears a most core high-energy-density battery core of the power battery pack, and the mechanical performance of the structure of the power battery pack is determined to a great extent by the safety performance of the power battery pack, so that multiple times of simulation and final tests are required to determine the structural strength of the battery tray in the development process.
Disclosure of Invention
The invention aims to provide a new energy automobile battery tray topological structure simulation test method and device, and solves the problem that the existing battery tray structure simulation test method cannot quickly respond to design changes.
In order to achieve the above object, in a first aspect of the present invention, a new energy automobile battery tray topological structure simulation test method is provided, including:
acquiring initial structure parameters of a battery pack, wherein the initial structure parameters of the battery pack comprise the initial size of a battery tray, the initial material of the battery tray, the initial self weight of the battery tray and the initial weight of a battery module;
constructing a first topological structure model of the battery tray based on the initial structure parameters of the battery pack; and
performing rigidity and strength simulation on the first topological structure model, and determining an initial structure of the battery tray according to a simulation result to obtain a second topological structure model of the battery tray;
acquiring final structural parameters of the battery pack, wherein the final structural parameters of the battery pack comprise the final size of the battery tray, the final material of the battery tray, the final self weight of the battery tray and the final weight of the battery module;
and constructing a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and carrying out rigidity and strength simulation on the three-dimensional finite element model according to the final structure parameters of the battery pack so as to determine the final structure of the battery tray according to the simulation result.
Optionally, the first topology is a finite element model with simplified three-dimensional structural features of the battery pack, and the building of the first topology model of the battery tray based on the initial structural parameters of the battery pack includes:
acquiring the boundary and constraint of the battery tray;
and constructing a first topological structure model of the battery tray according to the initial size of the battery tray, the initial material of the battery tray, the initial self weight of the battery tray, the initial weight of the battery module, the boundary of the battery tray and the constraint.
Optionally, performing rigidity and strength simulation on the first topological structure model, and determining an initial structure of the battery tray according to a simulation result to obtain a second topological structure model of the battery tray, including:
respectively carrying out simulation analysis on static stiffness, mode, transverse extrusion stiffness and longitudinal extrusion stiffness on the first topological structure model;
judging whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model all meet preset conditions; if so, taking the first topological structure model as the second topological structure model; otherwise, the first topological structure is adjusted according to the simulation result until the static rigidity, the mode, the transverse extrusion rigidity and the longitudinal extrusion rigidity of the adjusted first topological structure model all meet preset conditions, and the adjusted first topological structure model is used as the second topological structure model.
Optionally, performing static stiffness simulation analysis on the first topological structure model, and determining whether the first topological structure model meets a preset condition, including:
respectively applying a first gravity and a second gravity to the first topological structure;
when the first deformation displacement of the first topological structure under the first gravity is smaller than a first threshold value and the second deformation displacement of the first topological structure under the second gravity is smaller than a second threshold value, the first topological structure model meets a preset condition;
the second threshold is n times the first threshold.
Optionally, if not, adjusting the first topological structure according to the simulation result until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as the second topological structure model, including:
if any one of the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model does not meet the preset condition, adding the corresponding structural beam at a position where the first topological structure model does not meet the preset condition until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, taking the cross points among all the structural beams as middle fixed points of the first topological structure model, marking all the middle fixed points in the first topological structure model, and taking the first topological structure model after the middle fixed points are marked as the second topological structure model.
In a second aspect of the present invention, a new energy vehicle battery tray topological structure simulation testing device is provided, including:
the battery pack structure comprises a first data acquisition module, a second data acquisition module and a third data acquisition module, wherein the first data acquisition module is configured to acquire initial structure parameters of a battery pack, and the initial structure parameters of the battery pack comprise the initial size of a battery tray, the initial material of the battery tray, the initial self weight of the battery tray and the initial weight of a battery module;
a first calculation module configured to construct a first topological structure model of a battery tray based on initial structure parameters of the battery pack; and
performing rigidity and strength simulation on the first topological structure model, and determining an initial structure of the battery tray according to a simulation result to obtain a second topological structure model of the battery tray;
the second data acquisition module is configured to acquire final structural parameters of the battery pack, wherein the final structural parameters of the battery pack comprise the final size of the battery tray, the final material of the battery tray, the final self weight of the battery tray and the final weight of the battery module;
and the second computing module is configured to construct a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and perform rigidity and strength simulation on the three-dimensional finite element model according to the final structure parameters of the battery pack so as to determine the final structure of the battery tray according to the simulation result.
Optionally, the first topology is a finite element model with simplified three-dimensional structural features of the battery pack, and the first computing module includes:
a first data acquisition unit configured to acquire a boundary and a constraint of the battery tray;
a first calculation unit configured to construct a first topology model of the battery tray according to an initial size of the battery tray, an initial material of the battery tray, an initial self-weight of the battery tray, an initial weight of the battery module, a boundary of the battery tray, and a constraint.
Optionally, the first computing module further includes:
the second computing unit is configured to perform simulation analysis on static stiffness, modal, transverse extrusion stiffness and longitudinal extrusion stiffness on the first topological structure model respectively;
judging whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model all meet preset conditions; if so, taking the first topological structure model as the second topological structure model; otherwise, adjusting the first topological structure according to the simulation result until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as the second topological structure model.
Optionally, the second computing unit comprises:
a first computing subunit configured to apply first and second gravitational forces, respectively, to the first topology;
when the first deformation displacement of the first topological structure under the first gravity is smaller than a first threshold value and the second deformation displacement of the first topological structure under the second gravity is smaller than a second threshold value, the first topological structure model meets a preset condition;
the second threshold is n times the first threshold.
Optionally, the second computing unit further includes:
the second calculating subunit is configured to, if any one of the static stiffness, the modal, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model does not meet a preset condition, add a corresponding structural beam to a position where the first topological structure model does not meet the preset condition until the static stiffness, the modal, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, use intersection points between all the structural beams as middle fixed points of the first topological structure model, mark all the middle fixed points in the first topological structure model, and use the first topological structure model after the middle fixed points as the second topological structure model.
According to the technical scheme, the first topological structure model of the battery tray is constructed in advance according to the initial design parameters of the battery pack, and the second topological structure model capable of meeting the initial design parameter requirements of the battery pack is obtained through simulation verification based on the first topological structure model, so that when the design of the battery tray is changed or the power battery module is updated and needs to be adjusted, the second topological structure model can be slightly changed, and the structural model of the battery tray is subjected to simulation test to determine the final structure of the battery tray.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a flowchart of a new energy vehicle battery tray topological structure simulation test method provided in a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a simulation of a conventional battery pack structure according to a preferred embodiment of the present invention;
fig. 3 is a schematic simulation diagram of a new energy vehicle battery tray topological structure simulation test method according to a preferred embodiment of the present invention;
fig. 4 is a top view of a battery tray structure according to a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of a first topology model provided by the preferred embodiment of the present invention;
fig. 6 is a top view of another battery tray configuration provided in accordance with a preferred embodiment of the present invention;
FIG. 7 is a diagram of a second topology model provided by the preferred embodiment of the present invention;
fig. 8 is a schematic diagram of a new energy vehicle battery tray topological structure simulation testing device according to a preferred embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, in a first aspect of the present invention, a new energy vehicle battery tray topological structure simulation test method is provided, including:
s100, acquiring initial structure parameters of the battery pack, wherein the initial structure parameters of the battery pack comprise the initial size of a battery tray, the initial material of the battery tray, the initial self weight of the battery tray and the initial weight of a battery module;
s200, constructing a first topological structure model of the battery tray based on the initial structure parameters of the battery pack; performing rigidity and strength simulation on the first topological structure model, and determining the initial structure of the battery tray according to the simulation result to obtain a second topological structure model of the battery tray;
s300, obtaining final structural parameters of the battery pack, wherein the final structural parameters of the battery pack comprise the final size of the battery tray, the final material of the battery tray, the final self weight of the battery tray and the final weight of the battery module;
s400, building a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and performing rigidity and strength simulation on the three-dimensional finite element model according to the final structure parameters of the battery pack so as to determine the final structure of the battery tray according to the simulation result.
Therefore, in the embodiment, the first topological structure model of the battery tray is constructed in advance according to the initial design parameters of the battery pack, and the second topological structure model capable of meeting the requirements of the initial design parameters of the battery pack is obtained through simulation verification based on the first topological structure model, so that when the design of the battery tray structure needs to be adjusted due to design change or power battery module updating, the second topological structure model can be slightly changed, and the structural model of the battery tray is subjected to simulation test to determine the final structure of the battery tray.
Specifically, as shown in fig. 2 and fig. 3, in the development and design process of the new energy vehicle battery pack, the concept stage is the most important, the whole topology structure largely determines the complete design scheme, and the battery tray structure is a part of the battery pack structure, and since the battery tray structure carries the most core high-energy-density battery core of the power battery, the mechanical performance of the structure determines the safety of the power battery pack. However, in the existing battery pack structure development, the simulation test of the structure of the battery tray is often performed at the later stage of the whole design process, that is, after the structural parameters of the battery pack are basically determined, the battery pack structure is subjected to multiple rounds of simulation tests under various working conditions based on the parameters, the structural parameters are adjusted according to the test results to meet the design requirements, and then the battery pack structure is subjected to physical verification. In the embodiment, at the initial development stage of the battery structure, the arrangement and the spatial check of the battery modules are performed in advance according to the design boundary and the battery performance requirement, so as to determine the initial structure parameters of the battery pack, and the initial structure parameters of the battery pack, such as the initial size, the material, the self-weight, the number, the arrangement and the total weight of the battery modules, are obtained through automatic reading or manual input, so as to establish the initial structure of the battery tray according to the initial structure parameters and establish a first topological structure model of the battery tray, wherein the first topological structure model can be established based on CAE simulation software and perform preliminary rigid strength simulation on the first topological structure model, for example, simulation of multiple working conditions is performed to judge whether the first topological structure model meets the strength requirement, and if not, the first topological structure model parameters are modified, And adjusting until the rigidity and strength requirements are met so as to construct a second topological structure model meeting the rigidity and strength requirements. For the same vehicle model, the design of the battery pack needs to meet the fixed whole vehicle architecture, therefore, certain parameters of the battery pack have fixed initial values, for example, parameters such as the boundary and the size of the battery tray, the number and the weight of the battery modules are often fixed values determined in advance, on this basis, in the concept stage of the battery pack design, the first topological structure model of the battery tray is constructed according to the initial structure parameters of the battery pack determined preliminarily, for example, the first topological structure model of the battery tray, such as Hypermesh simulation software, is constructed through CAE simulation software according to the initial size, the initial material, the initial self weight of the battery tray, the initial weight of the battery modules and the preset arrangement mode of the battery modules, and is subjected to mechanical performance simulation tests of different working conditions to adjust the parameters of the first topological structure model, and obtaining an initial topological structure model of the battery tray, namely a second topological structure model, until the battery tray can meet the basic rigidity and strength requirements of the battery pack, so that the subsequent battery pack development design can be guided based on the second topological structure model. In the design process of the battery pack, the final structure parameters of the battery pack are often different from the initial structure parameters determined in the design concept stage to a certain extent, so that after the final structure parameters of the battery pack are determined, a battery pack three-dimensional finite element model comprising the battery tray and the battery module is established based on the second topological structure model by obtaining the final size, the final material, the final self weight of the battery tray and the final weight of the battery module, finite element data of the battery pack are determined, simulation tests of modal, extrusion and random vibration are carried out on the battery pack under different working conditions according to the finite element data of the battery pack, and the three-dimensional finite element model is modified and adjusted according to simulation results to determine the final structure of the battery tray.
When the structure of the battery tray needs to be changed due to the subsequent structural design change or battery module update, for example, due to the fact that the battery module is updated and arranged in a manner different from the preset arrangement manner of the battery modules adopted for constructing the second topological structure model of the battery tray, the stress point of the battery tray further changes, therefore, when the structure of the battery tray needs to be adjusted, only the final arrangement of the battery modules needs to be obtained, and the second topological structure model is adjusted, if any one parameter of the final size of the battery tray designed by the battery pack, the final material of the battery tray, the final self weight of the battery tray or the final weight of the battery module changes compared with the initial structural parameter of the battery pack, only the changed final structural parameter needs to be obtained and the second topological structure model is adjusted correspondingly, the detailed three-dimensional finite element model can be established on the basis of the adjusted second topological structure model, and the final structure of the battery tray can be determined by performing simulation test, so that the new three-dimensional finite element model can be quickly modified and established on the basis of the second topological structure model when the design is changed, and the design efficiency is effectively improved. Meanwhile, vehicle models based on the same architecture but different models are generally high in universality in terms of battery pack structure, so that when the battery pack structure is designed for the vehicle models based on the same architecture but different models, a corresponding three-dimensional finite element model can be quickly established based on the second topological structure model and the final structure parameters of the battery pack of the corresponding vehicle model.
In order to further improve the research and development efficiency and shorten the research and development cycle, the first topological structure is a finite element model with simplified three-dimensional structural features of the battery pack, and the first topological structure model of the battery tray is constructed based on the initial structural parameters of the battery pack, and the method comprises the following steps:
acquiring the boundary and constraint of the battery tray, and determining the initial structure shape and constraint points of the battery tray; and constructing a first topological structure model of the battery tray based on CAE simulation software according to the initial size of the battery tray, the initial material of the battery tray, the initial self weight of the battery tray, the initial weight of the battery module, the boundary and the constraint of the battery tray. In this embodiment, the initial structure of the battery tray is obtained according to the electric quantity demand of the whole vehicle and the space arrangement concept, the initial structure of the battery tray comprises a rectangular chassis and four baffle plates vertically arranged on the chassis, the four baffle plates are enclosed to form a rectangle corresponding to the chassis, the structural beam is arranged between the two longer baffle plates of the battery tray and is perpendicular to the two longer baffle plates of the battery tray, a constraint point is determined, and the constraint can be welding or bolt connection, so that the structural beam, the baffle plates and the chassis are fixed.
After the first topological structure model is determined, rigidity and strength simulation is carried out on the first topological structure model, the initial structure of the battery tray is determined according to the simulation result, and a second topological structure model of the battery tray is obtained, wherein the method comprises the following steps:
respectively carrying out simulation analysis on static stiffness, mode, transverse extrusion stiffness and longitudinal extrusion stiffness on the first topological structure model; judging whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model all meet preset conditions; if so, taking the first topological structure model as a second topological structure model; otherwise, adjusting the first topological structure according to the simulation result until the static rigidity, the mode, the transverse extrusion rigidity and the longitudinal extrusion rigidity of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as a second topological structure model.
Wherein, carry out static rigidity simulation analysis to first topological structure model, judge whether first topological structure model satisfies the preset condition, include:
respectively applying a first gravity and a second gravity to the first topological structure; when the first deformation displacement of the first topological structure under the first gravity is smaller than a first threshold value and the second deformation displacement of the first topological structure under the second gravity is smaller than a second threshold value, the first topological structure model meets a preset condition; the second threshold is n times the first threshold.
In this embodiment, according to the arrangement of the battery modules, 1-time dead weight and 3-time dead weight are applied to the first topological structure model respectively to perform a simulation test on the first topological structure, and at the same time, a simulation test on the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness is performed on the first topological structure model to determine whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model satisfy preset conditions.
Otherwise, adjusting the first topological structure according to the simulation result until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as a second topological structure model, including:
if any one of the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model does not meet the preset condition, adding the corresponding structural beam at a position where the first topological structure model does not meet the preset condition until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, taking the cross points among all the structural beams as middle fixed points of the first topological structure model, marking all the middle fixed points in the first topological structure model, and taking the first topological structure model after the middle fixed points are marked as a second topological structure model.
The structural beams are important structural members of the battery tray and function to support the battery cover and maintain the rigid strength properties of the chassis of the battery tray. When the battery tray receives the impact of battery module, the structure roof beam bears main impact to maintain battery tray's stable in structure, to the module of different arrangements, the distribution of structure roof beam also needs the corresponding adjustment, consequently, reserves middle fixed point and is favorable to the convenient change that carries out the structure roof beam when subsequent battery tray structural design, thereby carries out the simulation of isostructure, can effectively improve simulation efficiency. For example, when the transverse extrusion stiffness of the two shorter baffles of the first topological structure model does not meet the preset condition, a structural beam perpendicular to the two shorter baffles is added between the two shorter baffles, and so on, when the static stiffness, the mode, the transverse extrusion stiffness or the longitudinal extrusion stiffness of the first topological structure model does not meet the preset condition, the structural beam is added to adjust the first topological structure model, and the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness are subjected to simulation test until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, and the intersection point between the structural beams is marked as a middle fixed point, so that the second topological structure model is determined.
Next, a first topological structure model and a second topological structure model are used for carrying out simulation test comparison, wherein, as shown in fig. 4 and 5, the first topological structure model is provided with 3 structural beams between two longer baffles of the battery tray of the scheme 1, and as shown in fig. 6 and 7, the second topological structure model is provided with 3 structural beams between two longer baffles of the battery tray of the scheme 2, and 2 structural beams are connected between two shorter baffles of the battery tray, and an intersection point between the structural beams is taken as an intermediate fixed point, which is also called an intermediate hanging point. In scheme 1 and scheme 2, the beam sections of the battery trays are all made of a-b-t aluminum profiles, and the weight of all the VDA battery modules is m2=n*mmodule=324 kg; in scheme 1, the weight of the battery tray is m1=33kg, overall topological weight m1+m2=357 kg; in scheme 2, the weight of the battery tray is m3=38kg, overall topological weight m3+m2=362 kg. Respectively carrying out simulation tests on static stiffness, mode, transverse extrusion stiffness or longitudinal extrusion stiffness on the topological structure models of the scheme 1 and the scheme 2, wherein the static stiffness tests are respectively carried out on the topological structure models of the scheme 1 and the scheme 2 by applying 1 time of dead weight, namely 357kg, and 3 times of dead weight, namely 1071kg, and the specific simulation test results are shown in table 1:
TABLE 1
According to simulation tests, the battery tray topological structure of the scheme 2 is greatly improved after the middle fixing point is added, so that the position of the middle fixing point needs to be reserved, and a structural beam at the collision position of the column of the whole vehicle needs to be added to transfer load if the extrusion rigidity at the collision position of the column does not meet the design target. Therefore, the battery tray topological structure of the scheme 2 is better in overall mode, small in self deformation, and small in extrusion deformation of the simulated whole vehicle pillar collision position, so that the battery tray topological structure of the scheme 2 is used for guiding the detailed design of the subsequent battery pack structure.
As shown in fig. 8, in a second aspect of the present embodiment, there is provided a new energy vehicle battery tray topology structure simulation test apparatus, including:
the first data acquisition module is configured to acquire initial structure parameters of the battery pack, wherein the initial structure parameters of the battery pack comprise the initial size of the battery tray, the initial material of the battery tray, the initial self weight of the battery tray and the initial weight of the battery module;
a first calculation module configured to construct a first topological structure model of the battery tray based on the initial structure parameters of the battery pack; and
performing rigidity and strength simulation on the first topological structure model, and determining the initial structure of the battery tray according to the simulation result to obtain a second topological structure model of the battery tray;
the second data acquisition module is configured to acquire final structural parameters of the battery pack, wherein the final structural parameters of the battery pack comprise the final size of the battery tray, the final material of the battery tray, the final self weight of the battery tray and the final weight of the battery module;
and the second calculation module is configured to construct a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and perform rigidity and strength simulation on the three-dimensional finite element model according to the final structure parameters of the battery pack so as to determine the final structure of the battery tray according to the simulation result.
Optionally, the first topology is a finite element model with simplified three-dimensional structural features of the battery pack, and the first calculation module includes:
a first data acquisition unit configured to acquire a boundary and a constraint of the battery tray;
a first calculation unit configured to construct a first topology model of the battery tray according to an initial size of the battery tray, an initial material, an initial self-weight of the battery tray, an initial weight of the battery module, a boundary of the battery tray, and a constraint.
Optionally, the first computing module further includes:
the second computing unit is configured to perform simulation analysis on the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model respectively;
judging whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model all meet preset conditions; if so, taking the first topological structure model as a second topological structure model; otherwise, adjusting the first topological structure according to the simulation result until the static rigidity, the mode, the transverse extrusion rigidity and the longitudinal extrusion rigidity of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as a second topological structure model.
Optionally, the second computing unit comprises:
a first computing subunit configured to apply a first gravity and a second gravity to the first topology, respectively;
when the first deformation displacement of the first topological structure under the first gravity is smaller than a first threshold value and the second deformation displacement of the first topological structure under the second gravity is smaller than a second threshold value, the first topological structure model meets a preset condition;
the second threshold is n times the first threshold.
Optionally, the second computing unit further includes:
the second calculating subunit is configured to, if any one of the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model does not meet the preset condition, add the corresponding structural beam to a position where the first topological structure model does not meet the preset condition until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, use the intersection points between all the structural beams as middle fixed points of the first topological structure model, mark all the middle fixed points in the first topological structure model, and use the first topological structure model after the middle fixed points as a second topological structure model.
In summary, in the embodiment, the first topological structure model of the battery tray is constructed in advance according to the initial design parameters of the battery pack, and the second topological structure model capable of meeting the initial design parameter requirements of the battery pack is obtained through simulation verification based on the first topological structure model, so that when the final structural design of the battery tray is determined, the final structural model of the battery tray can be constructed only by slightly changing the second topological structure model on the basis of the second topological structure model, and the structural model of the battery tray is subjected to simulation test to adjust and determine the final structure of the battery tray.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same shall be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (8)
1. A new energy automobile battery tray topological structure simulation test method is characterized by comprising the following steps:
acquiring initial structure parameters of a battery pack, wherein the initial structure parameters of the battery pack comprise the initial size of a battery tray, the initial material of the battery tray, the initial self weight of the battery tray and the initial weight of a battery module;
constructing a first topological structure model of the battery tray based on the initial structure parameters of the battery pack; and
performing rigidity and strength simulation on the first topological structure model, and determining an initial structure of the battery tray according to a simulation result to obtain a second topological structure model of the battery tray;
acquiring final structural parameters of the battery pack, wherein the final structural parameters of the battery pack comprise the final size of the battery tray, the final material of the battery tray, the final self weight of the battery tray and the final weight of the battery module;
building a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and carrying out rigidity and strength simulation on the three-dimensional finite element model according to the final structure parameters of the battery pack so as to determine the final structure of the battery tray according to the simulation result;
performing rigidity and strength simulation on the first topological structure model, and determining the initial structure of the battery tray according to a simulation result to obtain a second topological structure model of the battery tray, wherein the rigidity and strength simulation comprises the following steps:
respectively carrying out simulation analysis on static stiffness, mode, transverse extrusion stiffness and longitudinal extrusion stiffness on the first topological structure model;
judging whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model all meet preset conditions; if so, taking the first topological structure model as the second topological structure model; otherwise, the first topological structure is adjusted according to the simulation result until the static rigidity, the mode, the transverse extrusion rigidity and the longitudinal extrusion rigidity of the adjusted first topological structure model all meet preset conditions, and the adjusted first topological structure model is used as the second topological structure model.
2. The new energy automobile battery tray topological structure simulation test method according to claim 1, wherein the first topological structure is a finite element model with three-dimensional structural feature simplification of the battery pack, and the building of the first topological structure model of the battery tray based on the initial structural parameters of the battery pack comprises:
acquiring the boundary and constraint of the battery tray;
and constructing a first topological structure model of the battery tray according to the initial size of the battery tray, the initial material of the battery tray, the initial self weight of the battery tray, the initial weight of the battery module, the boundary of the battery tray and the constraint.
3. The new energy automobile battery tray topological structure simulation test method according to claim 1, wherein the step of performing static stiffness simulation analysis on the first topological structure model and judging whether the first topological structure model meets a preset condition comprises the steps of:
respectively applying a first gravity and a second gravity to the first topological structure;
when the first deformation displacement of the first topological structure under the first gravity is smaller than a first threshold value and the second deformation displacement of the first topological structure under the second gravity is smaller than a second threshold value, the first topological structure model meets a preset condition;
the second threshold is n times the first threshold.
4. The new energy automobile battery tray topological structure simulation test method of claim 1, wherein otherwise, the first topological structure is adjusted according to the simulation result until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as the second topological structure model comprises:
if any one of the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model does not meet the preset condition, adding the corresponding structural beam at a position where the first topological structure model does not meet the preset condition until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, taking the cross points among all the structural beams as middle fixed points of the first topological structure model, marking all the middle fixed points in the first topological structure model, and taking the first topological structure model after the middle fixed points are marked as the second topological structure model.
5. The utility model provides a new energy automobile battery tray topological structure simulation testing arrangement which characterized in that includes:
the battery pack structure comprises a first data acquisition module, a second data acquisition module and a third data acquisition module, wherein the first data acquisition module is configured to acquire initial structure parameters of a battery pack, and the initial structure parameters of the battery pack comprise the initial size of a battery tray, the initial material of the battery tray, the initial self weight of the battery tray and the initial weight of a battery module;
a first calculation module configured to construct a first topological structure model of a battery tray based on initial structure parameters of the battery pack; performing rigidity and strength simulation on the first topological structure model, and determining an initial structure of the battery tray according to a simulation result to obtain a second topological structure model of the battery tray;
the second data acquisition module is configured to acquire final structural parameters of the battery pack, wherein the final structural parameters of the battery pack comprise the final size of the battery tray, the final material of the battery tray, the final self weight of the battery tray and the final weight of the battery module;
the second computing module is configured to construct a three-dimensional finite element model of the battery tray and the battery module based on the second topological structure model, and perform rigidity and strength simulation on the three-dimensional finite element model according to final structure parameters of the battery pack so as to determine a final structure of the battery tray according to a simulation result;
the first computing module further comprises:
the second computing unit is configured to perform simulation analysis on static stiffness, modal, transverse extrusion stiffness and longitudinal extrusion stiffness on the first topological structure model respectively;
judging whether the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model all meet preset conditions; if so, taking the first topological structure model as the second topological structure model; otherwise, adjusting the first topological structure according to the simulation result until the static stiffness, the mode, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the adjusted first topological structure model all meet preset conditions, and taking the adjusted first topological structure model as the second topological structure model.
6. The new energy automobile battery tray topological structure simulation testing device of claim 5, wherein the first topological structure is a finite element model with three-dimensional structural feature simplification of the battery pack, and the first calculation module comprises:
a first data acquisition unit configured to acquire a boundary and a constraint of the battery tray;
a first calculation unit configured to construct a first topology model of the battery tray according to an initial size of the battery tray, an initial material of the battery tray, an initial self-weight of the battery tray, an initial weight of the battery module, a boundary of the battery tray, and a constraint.
7. The new energy automobile battery tray topological structure simulation testing device of claim 5, wherein the second computing unit comprises:
a first computing subunit configured to apply first and second gravitational forces, respectively, to the first topology;
when the first deformation displacement of the first topological structure under the first gravity is smaller than a first threshold value and the second deformation displacement of the first topological structure under the second gravity is smaller than a second threshold value, the first topological structure model meets a preset condition;
the second threshold is n times the first threshold.
8. The new energy automobile battery tray topological structure simulation testing device of claim 5, wherein the second computing unit further comprises:
the second calculating subunit is configured to, if any one of the static stiffness, the modal, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model does not meet a preset condition, add a corresponding structural beam to a position where the first topological structure model does not meet the preset condition until the static stiffness, the modal, the transverse extrusion stiffness and the longitudinal extrusion stiffness of the first topological structure model after the structural beam is added meet the preset condition, use intersection points between all the structural beams as middle fixed points of the first topological structure model, mark all the middle fixed points in the first topological structure model, and use the first topological structure model after the middle fixed points as the second topological structure model.
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