CN118153208A - New energy battery pack bracket structure performance analysis and evaluation method - Google Patents
New energy battery pack bracket structure performance analysis and evaluation method Download PDFInfo
- Publication number
- CN118153208A CN118153208A CN202410568409.7A CN202410568409A CN118153208A CN 118153208 A CN118153208 A CN 118153208A CN 202410568409 A CN202410568409 A CN 202410568409A CN 118153208 A CN118153208 A CN 118153208A
- Authority
- CN
- China
- Prior art keywords
- battery pack
- whole vehicle
- working condition
- analysis working
- quasi
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004458 analytical method Methods 0.000 title claims abstract description 157
- 238000011156 evaluation Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 24
- 230000005284 excitation Effects 0.000 claims abstract description 9
- 238000001228 spectrum Methods 0.000 claims description 59
- 238000004364 calculation method Methods 0.000 claims description 46
- 230000001133 acceleration Effects 0.000 claims description 39
- 238000006073 displacement reaction Methods 0.000 claims description 31
- 230000005484 gravity Effects 0.000 claims description 23
- 238000009826 distribution Methods 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 17
- 230000036316 preload Effects 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 9
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Automation & Control Theory (AREA)
- Aviation & Aerospace Engineering (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a new energy battery pack bracket structure performance analysis and evaluation method, belongs to the technical field of new energy commercial automobiles, and aims to solve the problem that in the prior art, the difference of loading conditions of a battery frame in a whole vehicle environment is ignored, and the problem that the structural performance evaluation has certain limitation because the contact between components and the prestress condition caused by an initial assembly environment are not comprehensively considered in the modal analysis and random vibration analysis processes. According to the invention, the quasi-static strength analysis and modal analysis working conditions of the battery pack bracket in the whole vehicle environment are considered, the analysis result is more close to engineering application, and the analysis working conditions comprise the quasi-static strength analysis working conditions without considering the excitation frequency, and the modal analysis and random vibration analysis working conditions with considering the excitation frequency, so that the structural performance of the battery pack bracket can be more comprehensively examined.
Description
Technical Field
The invention relates to a new energy battery pack bracket structure performance analysis and evaluation method, and belongs to the technical field of new energy commercial automobiles.
Background
The new energy battery pack bracket is used for bearing a battery pack and a cooling system assembly, and is arranged on a frame and subjected to various loads caused by uneven road surface impact, so that the structural performance of the new energy battery pack bracket needs to be evaluated in a key way.
At present, more battery package bracket performance analysis methods are related in the industry, but the performance analysis is often carried out by one of two methods of analyzing by considering road surface frequency and analyzing without considering road surface frequency, or the performance calculation of a battery frame under the action of load is only considered, the difference of the loading condition of the battery frame under the whole vehicle environment is ignored, and the prestress condition caused by the contact of parts and the initial assembly environment is not comprehensively considered in the modal analysis and random vibration analysis process, so that the structural performance evaluation has certain limitation and the actual working effect is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a new energy battery pack bracket structure performance analysis and evaluation method, and solves the problem that the existing battery pack bracket performance analysis method ignores the different loading conditions of a battery frame in a whole vehicle environment, and the problem that the structural performance evaluation has certain limitation because the prestress conditions caused by the initial assembly environment are not comprehensively considered in the modal analysis and random vibration analysis processes due to the contact of parts.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a new energy battery pack bracket structure performance analysis and evaluation method, which comprises the following steps:
Step a: collecting first acceleration load spectrums at the central positions of all connecting vertical plates in the whole vehicle, collecting relative displacement spectrums between the vehicle frame and the vehicle axle, and collecting second acceleration load spectrums at the central positions of all connecting vertical plates in the hoisting process of the battery pack and the battery pack bracket;
Step b: building a whole-vehicle finite element model, and acquiring a battery pack and a finite element model of a battery pack bracket according to the whole-vehicle finite element model;
Step c: establishing quasi-static analysis working conditions of vertical impact, steering, braking, torsion and hoisting according to a first acceleration load spectrum, a relative displacement spectrum and a second acceleration load spectrum, solving and calculating each quasi-static analysis working condition by combining a whole vehicle finite element model, and evaluating and analyzing calculation results of each quasi-static analysis working condition to obtain a first evaluation result;
Step d: establishing a quasi-static analysis working condition when the whole vehicle is only subjected to gravity, combining a whole vehicle finite element model, and carrying out nonlinear calculation on the whole vehicle by considering contact between components to obtain a stress distribution result of the whole vehicle;
Step e: establishing a whole vehicle modal analysis working condition, adding a quasi-static analysis working condition of the whole vehicle under gravity only as a preload into the whole vehicle modal analysis working condition, carrying out solving calculation by combining a whole vehicle finite element model, and evaluating and analyzing a calculation result of the whole vehicle modal analysis working condition to obtain a second evaluation result;
Step f: establishing a random vibration analysis working condition, adding a quasi-static analysis working condition of the whole vehicle under the gravity force as a preload into the random vibration analysis working condition, solving and calculating by combining finite element models of the battery pack and the battery pack bracket, and evaluating and analyzing a calculation result of the random vibration analysis working condition to obtain a third evaluation result;
Step g: and analyzing and evaluating the performance of the new energy battery pack bracket structure according to the first evaluation result, the second evaluation result and the third evaluation result.
Further, the collecting the first acceleration load spectrum of each connecting vertical plate center position in the whole vehicle specifically comprises:
collecting longitudinal, transverse and vertical three-dimensional vibration acceleration spectrums at the central positions of all connecting vertical plates in the whole vehicle;
the relative displacement spectrum between the acquisition frame and the axle comprises:
collecting the relative displacement spectrum between the frame and the front, middle and rear axles;
The vehicle axle comprises a front axle, a middle axle and a rear axle, and the vehicle frame comprises a front end vehicle frame and a rear end vehicle frame.
Further, the whole vehicle comprises a vehicle body, a battery pack bracket, a vehicle frame, a suspension, an axle and a power assembly.
Further, each quasi-static analysis working condition is solved and calculated by combining a whole vehicle finite element model, and the method specifically comprises the following steps:
Carrying out drift removal, deburring and filtering treatment on the first acceleration load spectrum, extracting the maximum values of longitudinal, transverse and vertical acceleration in the whole load process, and taking the maximum values as the load of a brake, steering and vertical impact quasi-static analysis working condition;
Carrying out drift removal, deburring and filtering treatment on the relative displacement spectrum, extracting the maximum displacement of the front end frame relative to the front axle in the whole displacement signal process, and taking the maximum displacement of the rear end frame relative to the middle axle and the rear axle as the load of the torsion quasi-static analysis working condition;
carrying out drift removal, deburring and filtering treatment on the second acceleration load spectrum, and extracting the acceleration maximum value of the load process in the whole hoisting process to serve as the load of the hoisting quasi-static analysis working condition;
performing component constraint according to the running condition of the whole vehicle under the quasi-static analysis working conditions of vertical impact, steering, braking and torsion, setting nonlinear analysis load iteration parameters, and solving and calculating by combining a whole vehicle finite element model to obtain a whole vehicle stress distribution result;
The hoisting quasi-static analysis working condition is used for carrying out component constraint according to the process of hoisting the battery pack and the battery pack bracket to the chassis by a whole vehicle factory, setting nonlinear analysis load iteration parameters, and carrying out solving calculation by combining the finite element models of the battery pack and the battery pack bracket to obtain stress distribution results of the battery pack and the battery pack bracket;
the evaluation analysis is performed on the calculation results of each quasi-static analysis working condition to obtain a first evaluation result, and the method specifically comprises the following steps:
Judging whether the safety coefficient of the plate structure is larger than a first preset value or not according to the stress distribution result of the whole vehicle and the stress distribution result of the battery pack and the battery pack bracket, judging whether the safety coefficient of the casting structure is larger than a second preset value or not, and if both the two judgment results are yes, judging that the first evaluation result is passed; if one of the evaluation results is judged to be not passed, the first evaluation result is not passed;
wherein, the plate structure comprises a part with uniform plate thickness in the whole vehicle; the casting structure comprises castings with non-uniform plate thickness in the whole vehicle; coefficient of safety = yield strength/stress.
Further, the step d specifically includes:
Establishing a quasi-static analysis working condition when the whole vehicle is only subjected to gravity, performing component constraint according to the whole vehicle only subjected to the gravity working condition, setting nonlinear analysis load iteration parameters, combining a whole vehicle finite element model, and performing whole vehicle nonlinear calculation by considering contact between components to obtain a whole vehicle stress distribution result.
Furthermore, the solving and calculating by combining the whole vehicle finite element model in the step e specifically includes:
the method comprises the steps of adding a quasi-static analysis working condition of the whole vehicle when the whole vehicle is only subjected to gravity into a mode analysis working condition of the whole vehicle as a preload, carrying out component constraint according to the running condition of the whole vehicle, and carrying out solving calculation by combining a finite element model of the whole vehicle to obtain the mode shape and the mode frequency of the whole vehicle;
the evaluation analysis of the calculation result of the whole vehicle modal analysis working condition, and the second evaluation result is obtained, specifically comprising:
selecting an elastic mode belonging to a battery pack bracket from the mode shape of the whole vehicle, and recording the mode frequency of the battery pack bracket;
converting the first acceleration load spectrum into a PSD spectrum and recording the frequencies of a plurality of PSD peak signals;
Acquiring a plurality of frequency ranges according to the frequencies of the PSD peak signals;
Judging whether the modal frequency of the battery pack bracket is smaller than the minimum value in the frequencies of the PSD peak signals, judging whether the modal frequency of the battery pack bracket is in a plurality of frequency ranges, and if both the modal frequency and the frequency are not in the same frequency range, judging that the second evaluation result is passed; if one of the evaluation results is yes, the second evaluation result is not passed.
Further, the solving calculation of the finite element model combined with the battery pack and the battery pack bracket in the step f specifically includes:
Establishing modal frequency response analysis working conditions;
Applying longitudinal, transverse and vertical unit load spectrum excitation at each connecting vertical plate position, extracting the modes of 0-400Hz of the finite element models of the battery pack and the battery pack support, taking the quasi-static analysis working condition of the whole vehicle only subjected to gravity as the pre-load to be added into the modal frequency response analysis working condition, setting the damping of the finite element models of the battery pack and the battery pack support to be 0.06, and carrying out solving calculation in the longitudinal, transverse and vertical directions by combining the finite element models of the battery pack and the battery pack support;
Establishing a random vibration analysis working condition, substituting a modal frequency response analysis working condition into the random vibration analysis working condition, converting a first acceleration load spectrum into a PSD spectrum, introducing the PSD spectrum into the random vibration analysis working condition, combining a battery pack and a finite element model of a battery pack support, carrying out solving calculation to obtain a1 sigma stress field of the battery pack support in three loading directions, and obtaining the maximum 1 sigma stress of the battery pack support in the three loading directions;
The evaluation analysis is performed on the calculation result of the random vibration analysis working condition to obtain a third evaluation result, and the method specifically comprises the following steps:
If three times of the maximum 1 sigma stress of the battery pack bracket in the three loading directions exceeds the yield strength of the battery pack bracket, the third evaluation result is that the battery pack bracket does not pass; if three times the maximum 1 sigma stress of the battery pack holder in the three loading directions does not exceed the yield strength of the battery pack holder, the third evaluation result is passed.
Further, the analyzing and evaluating the performance of the new energy battery pack bracket structure specifically comprises:
if the first evaluation result, the second evaluation result and the third evaluation result are all passed, evaluating that the performance of the battery pack bracket structure meets the requirement;
otherwise, evaluating the structural performance of the battery pack bracket is not satisfied.
In a second aspect, the invention provides a new energy battery pack support structure determined by the new energy battery pack support structure performance analysis and evaluation method according to the first aspect, which comprises a battery pack support and a battery pack assembly, wherein the battery pack support and the battery pack assembly comprise a battery pack support and a battery pack, the battery pack is arranged on the inner side of the battery pack support, and a plurality of connecting vertical plates are symmetrically arranged on two sides of the outer wall of the battery pack support.
In a third aspect, the invention provides a new energy automobile, which comprises the new energy battery pack support structure of the second aspect, and further comprises a vehicle frame and a vehicle axle, wherein the vehicle axle comprises a front axle, a middle axle and a rear axle, the vehicle frame is fixedly connected with the battery pack support through a plurality of connecting vertical plates, displacement sensors are arranged among the front axle, the middle axle and the rear axle and between the vehicle frame, and the number of the connecting vertical plates is six.
Compared with the prior art, the invention has the beneficial effects that:
According to the new energy battery pack bracket structure performance analysis and evaluation method, the quasi-static strength analysis and modal analysis working conditions of the battery pack bracket in the whole vehicle environment are considered, the analysis result is more close to engineering application, the analysis working conditions comprise the quasi-static strength analysis working condition without the excitation frequency, the modal analysis and random vibration analysis working condition with the excitation frequency, and the structure performance of the battery pack bracket can be more comprehensively inspected;
in the modeling process, nonlinear influence factors such as contact and limit among components are fully considered, and a simulation result is more accurate;
The invention comprehensively evaluates the performance of the battery pack bracket, shortens a large amount of reliability road test verification time and saves test cost.
Drawings
FIG. 1 is a schematic flow chart of a new energy battery pack bracket structure performance analysis and evaluation method provided according to an embodiment of the invention;
Fig. 2 is an evaluation flow chart of a new energy battery pack bracket structure performance analysis and evaluation method according to an embodiment of the invention;
Fig. 3 is a schematic perspective view of a new energy automobile according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a first acceleration load spectrum acquisition scheme of a part of a connecting vertical plate of a new energy automobile according to an embodiment of the invention;
Fig. 5 is a schematic diagram of a relative displacement acquisition scheme of a frame and a front axle of a new energy automobile according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a relative displacement acquisition scheme of a frame, a middle axle and a rear axle of a new energy automobile according to an embodiment of the invention.
In the figure: 1. a battery pack bracket and a battery pack assembly; 2. a frame; 3. connecting the vertical plates; 4. a front axle; 5. a middle bridge; 6. a rear axle; 7. a displacement sensor.
Detailed Description
The following detailed description of the technical solutions of the present application will be given by way of the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present application are detailed descriptions of the technical solutions of the present application, and not limiting the technical solutions of the present application, and that the embodiments and technical features of the embodiments of the present application may be combined with each other without conflict.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Embodiment one:
As shown in fig. 1 to 2, the invention provides a new energy battery pack bracket structure performance analysis and evaluation method, which comprises the following steps:
Step a: collecting first acceleration load spectrums at the central positions of all connecting vertical plates in the whole vehicle, collecting relative displacement spectrums between the vehicle frame and the vehicle axle, and collecting second acceleration load spectrums at the central positions of all connecting vertical plates in the hoisting process of the battery pack and the battery pack bracket;
Step b: building a whole-vehicle finite element model, and acquiring a battery pack and a finite element model of a battery pack bracket according to the whole-vehicle finite element model;
Step c: establishing quasi-static analysis working conditions of vertical impact, steering, braking, torsion and hoisting according to a first acceleration load spectrum, a relative displacement spectrum and a second acceleration load spectrum, solving and calculating each quasi-static analysis working condition by combining a whole vehicle finite element model, and evaluating and analyzing calculation results of each quasi-static analysis working condition to obtain a first evaluation result;
Step d: establishing a quasi-static analysis working condition when the whole vehicle is only subjected to gravity, combining a whole vehicle finite element model, and carrying out nonlinear calculation on the whole vehicle by considering contact between components to obtain a stress distribution result of the whole vehicle;
Step e: establishing a whole vehicle modal analysis working condition, adding a quasi-static analysis working condition of the whole vehicle under gravity only as a preload into the whole vehicle modal analysis working condition, carrying out solving calculation by combining a whole vehicle finite element model, and evaluating and analyzing a calculation result of the whole vehicle modal analysis working condition to obtain a second evaluation result;
Step f: establishing a random vibration analysis working condition, adding a quasi-static analysis working condition of the whole vehicle under the gravity force as a preload into the random vibration analysis working condition, solving and calculating by combining finite element models of the battery pack and the battery pack bracket, and evaluating and analyzing a calculation result of the random vibration analysis working condition to obtain a third evaluation result;
Step g: and analyzing and evaluating the performance of the new energy battery pack bracket structure according to the first evaluation result, the second evaluation result and the third evaluation result.
An embodiment, gather the first acceleration load spectrum of each connection riser central point department in whole car, specifically include: collecting longitudinal, transverse and vertical three-dimensional vibration acceleration spectrums at the central positions of all connecting vertical plates in the whole vehicle;
the relative displacement spectrum between the acquisition frame and the axle comprises:
collecting the relative displacement spectrum between the frame and the front, middle and rear axles;
The vehicle axle comprises a front axle, a middle axle and a rear axle, and the vehicle frame comprises a front end vehicle frame and a rear end vehicle frame; the sampling frequency was set to 600Hz.
In one embodiment, the whole vehicle comprises a vehicle body, a battery pack bracket, a vehicle frame, a suspension, an axle and a power assembly.
Specifically, the plate structure comprises a part with uniform plate thickness in the whole vehicle structural member; the casting structure comprises a casting with non-uniform plate thickness in a whole vehicle structural member, data comprising a frame, a battery pack support and a suspension are imported into finite element analysis software, the plate members of the vehicle body, the plate members of the frame, rectangular pipes of the battery pack support and the plate members are plate members, a two-dimensional shell unit is adopted for dispersion, the grid size is 8mm, the casting plate spring battery pack support of the suspension, the casting battery pack support of the cab suspension, the casting battery pack support of the power assembly, the casting battery pack support of the battery pack and other non-uniform plate thickness members are casting structures, a three-dimensional entity unit is adopted for dispersion, the grid size is 5mm, the corresponding material parameters are set for each member, and the corresponding centralized mass unit is adopted for simulation for the members with small influence on supporting work such as a motor, a gearbox, an air compressor and saddle quality, according to the actual situation, the rigid/flexible units are attached to the corresponding battery pack mounting brackets, the bolts are simulated by adopting the combination of the rigid units and the beam units, the welding line units are simulated by adopting the combination of the three-dimensional units and the flexible units, the plate springs are simulated by adopting the two-dimensional shell units, the thickness of the shell units is set according to the rigidity of the plate springs, the rigidity of the plate springs is guaranteed to be a design value, the axle is simplified to be the beam unit simulation with the corresponding size according to the actual situation, the rigidity and the quality are guaranteed to correspond to the actual situation, the grid units of all the components are connected and combined to form a whole automobile, the contact pairs are established according to the design relationship among the components, the limiting relationship is established among the plate springs and the automobile frame according to the actual situation, and the load is transmitted among the components through contact, the bolts, the welding line, the limiting and the like during the actual operation condition is guaranteed. And under the no-load working condition of the whole vehicle, each axle load simulation calculation is carried out, and the analysis model is adjusted to be within 2% of the axle load difference between the simulation and the whole vehicle according to the axle load value of the whole vehicle, so that the simulation calculation model and the state of the whole vehicle are ensured to be consistent as much as possible.
In one embodiment, each quasi-static analysis condition is solved and calculated by combining a whole vehicle finite element model, and the method specifically includes:
Carrying out drift removal, deburring and filtering treatment on the first acceleration load spectrum, extracting the maximum values of longitudinal, transverse and vertical acceleration in the whole load process, and taking the maximum values as the load of a brake, steering and vertical impact quasi-static analysis working condition;
Carrying out drift removal, deburring and filtering treatment on the relative displacement spectrum, extracting the maximum displacement of the front end frame relative to the front axle in the whole displacement signal process, and taking the maximum displacement of the rear end frame relative to the middle axle and the rear axle as the load of the torsion quasi-static analysis working condition;
carrying out drift removal, deburring and filtering treatment on the second acceleration load spectrum, and extracting the acceleration maximum value of the load process in the whole hoisting process to serve as the load of the hoisting quasi-static analysis working condition;
performing component constraint according to the running condition of the whole vehicle under the quasi-static analysis working conditions of vertical impact, steering, braking and torsion, setting nonlinear analysis load iteration parameters, and solving and calculating by combining a whole vehicle finite element model to obtain a whole vehicle stress distribution result;
The hoisting quasi-static analysis working condition is used for carrying out component constraint according to the process of hoisting the battery pack and the battery pack bracket to the chassis by a whole vehicle factory, setting nonlinear analysis load iteration parameters, and carrying out solving calculation by combining the finite element models of the battery pack and the battery pack bracket to obtain stress distribution results of the battery pack and the battery pack bracket;
the evaluation analysis is performed on the calculation results of each quasi-static analysis working condition to obtain a first evaluation result, and the method specifically comprises the following steps:
Judging whether the safety coefficient of the plate structure is larger than a first preset value or not according to the stress distribution result of the whole vehicle and the stress distribution result of the battery pack and the battery pack bracket, judging whether the safety coefficient of the casting structure is larger than a second preset value or not, and if both the two judgment results are yes, judging that the first evaluation result is passed; if one of the evaluation results is judged to be not passed, the first evaluation result is not passed;
Wherein, the plate structure comprises a part with uniform plate thickness in the whole vehicle structural member; the casting structure comprises castings with non-uniform plate thickness in the whole vehicle structural member; coefficient of safety = yield strength/stress.
Specifically, the first preset value is 1.5, and the second preset value is 2, so that the safety coefficient of the plate structure is required to be greater than 1.5, the safety coefficient of the casting structure is required to be greater than 2, the requirement of the safety coefficient is met, the requirement of the quasi-static structural strength is met, and the requirement of the safety coefficient is not met.
In one embodiment, the step d specifically includes:
Establishing a quasi-static analysis working condition when the whole vehicle is only subjected to gravity, carrying out component constraint according to the working condition that the whole vehicle is only subjected to gravity, setting nonlinear analysis load iteration parameters, combining a whole vehicle finite element model, and carrying out whole vehicle nonlinear calculation by considering contact between components, namely carrying out whole vehicle nonlinear calculation by considering contact between components under the working condition that the whole vehicle is only subjected to gravity, namely vertical-1 g gravity acceleration load, so as to obtain a whole vehicle stress distribution result.
In one embodiment, the solving calculation in step e by combining the whole vehicle finite element model specifically includes:
The method comprises the steps of adding a quasi-static analysis working condition of the whole vehicle when the whole vehicle is only subjected to gravity into a mode analysis working condition of the whole vehicle as a preload, carrying out component constraint according to the running condition of the whole vehicle, and carrying out solving calculation by combining a finite element model of the whole vehicle to obtain the mode shape and the mode frequency of the whole vehicle, namely, taking the mode analysis of the preload into consideration;
the evaluation analysis of the calculation result of the whole vehicle modal analysis working condition, and the second evaluation result is obtained, specifically comprising:
selecting an elastic mode belonging to a battery pack bracket from the mode shape of the whole vehicle, and recording the mode frequency of the battery pack bracket;
converting the first acceleration load spectrum into a PSD spectrum and recording the frequencies of a plurality of PSD peak signals;
Acquiring a plurality of frequency ranges according to the frequencies of the PSD peak signals;
Judging whether the modal frequency of the battery pack bracket is smaller than the minimum value in the frequencies of the PSD peak signals, judging whether the modal frequency of the battery pack bracket is in a plurality of frequency ranges, and if both the modal frequency and the frequency are not in the same frequency range, judging that the second evaluation result is passed; if one of the evaluation results is yes, the second evaluation result is not passed.
Specifically, the frequency range is the frequency + -2 Hz of the corresponding PSD peak signal.
In one embodiment, the solving calculation in step f by combining the finite element model of the battery pack and the battery pack bracket specifically includes:
Establishing modal frequency response analysis working conditions;
Applying longitudinal, transverse and vertical unit load spectrum excitation at each connecting vertical plate position, extracting the modes of 0-400Hz of the finite element models of the battery pack and the battery pack support, taking the quasi-static analysis working condition of the whole vehicle only subjected to gravity as the pre-load to be added into the modal frequency response analysis working condition, setting the damping of the finite element models of the battery pack and the battery pack support to be 0.06, and carrying out solving calculation in the longitudinal, transverse and vertical directions by combining the finite element models of the battery pack and the battery pack support;
Establishing a random vibration analysis working condition, substituting a modal frequency response analysis working condition into the random vibration analysis working condition, converting a first acceleration load spectrum into a PSD spectrum, introducing the PSD spectrum into the random vibration analysis working condition, combining a battery pack and a finite element model of a battery pack support, carrying out solving calculation to obtain a1 sigma stress field of the battery pack support in three loading directions, and obtaining the maximum 1 sigma stress of the battery pack support in the three loading directions;
The evaluation analysis is performed on the calculation result of the random vibration analysis working condition to obtain a third evaluation result, and the method specifically comprises the following steps:
If three times of the maximum 1 sigma stress (i.e. 3 sigma stress) of the battery pack support in the three loading directions exceeds the yield strength of the battery pack support, the third evaluation result is that the battery pack support does not pass; if the maximum 1 sigma stress of the battery pack support in the three loading directions is three times (namely 3 sigma stress) that of the battery pack support, the third evaluation result is that the battery pack support passes, if the maximum 1 sigma stress of the battery pack support exceeds the yield strength of the battery pack support, the random vibration performance requirement of the battery pack support is not met, and if the maximum 1 sigma stress of the battery pack support does not exceed the yield strength of the battery pack support, the random vibration performance requirement of the battery pack support is met.
An embodiment, the analysis and evaluation to new energy battery package support structure performance specifically includes:
if the first evaluation result, the second evaluation result and the third evaluation result are all passed, evaluating that the performance of the battery pack bracket structure meets the requirement;
otherwise, evaluating the structural performance of the battery pack bracket is not satisfied.
According to the invention, the quasi-static strength analysis and modal analysis working conditions of the battery pack bracket in the whole vehicle environment are considered, the analysis result is more close to engineering application, and the analysis working conditions comprise the quasi-static strength analysis working conditions without considering the excitation frequency, and the modal analysis and random vibration analysis working conditions with considering the excitation frequency, so that the structural performance of the battery pack bracket can be more comprehensively examined.
According to the invention, nonlinear influence factors such as contact and limit among components are fully considered in the modeling process, and the simulation result is more accurate.
The invention comprehensively evaluates the performance of the battery pack bracket, shortens a large amount of reliability road test verification time and saves test cost.
Embodiment two:
The invention provides a new energy battery pack support structure determined by a new energy battery pack support structure performance analysis and evaluation method, which comprises a battery pack support and a battery pack assembly 1, wherein the battery pack support and the battery pack assembly 1 comprise a battery pack support and a battery pack, the battery pack is arranged on the inner side of the battery pack support, and a plurality of connecting vertical plates 3 are symmetrically arranged on two sides of the outer wall of the battery pack support.
Embodiment III:
As shown in fig. 3 to 6, the invention provides a new energy automobile, which comprises a new energy battery pack bracket structure according to the second embodiment, and further comprises a frame 2 and an axle, wherein the axle comprises a front axle 4, a middle axle 5 and a rear axle 6, the frame 2 is fixedly connected with the battery pack bracket through a plurality of connecting vertical plates 3, displacement sensors 7 are respectively arranged among the front axle 4, the middle axle 5 and the rear axle 6 and the frame 2, the number of the connecting vertical plates 3 is six, and fig. 4 is a first acceleration load spectrum acquisition scheme (only a single side is shown) of the partial connecting vertical plates 3; fig. 5 shows a relative displacement acquisition scheme (only one side is shown) of the frame 2 and the front axle 4; fig. 6 shows a relative displacement acquisition scheme (only one side is shown) of the frame 2 and the center and rear axles 5, 6.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. The new energy battery pack bracket structure performance analysis and evaluation method is characterized by comprising the following steps:
Step a: collecting first acceleration load spectrums at the central positions of all connecting vertical plates in the whole vehicle, collecting relative displacement spectrums between the vehicle frame and the vehicle axle, and collecting second acceleration load spectrums at the central positions of all connecting vertical plates in the hoisting process of the battery pack and the battery pack bracket;
Step b: building a whole-vehicle finite element model, and acquiring a battery pack and a finite element model of a battery pack bracket according to the whole-vehicle finite element model;
Step c: establishing quasi-static analysis working conditions of vertical impact, steering, braking, torsion and hoisting according to a first acceleration load spectrum, a relative displacement spectrum and a second acceleration load spectrum, solving and calculating each quasi-static analysis working condition by combining a whole vehicle finite element model, and evaluating and analyzing calculation results of each quasi-static analysis working condition to obtain a first evaluation result;
Step d: establishing a quasi-static analysis working condition when the whole vehicle is only subjected to gravity, combining a whole vehicle finite element model, and carrying out nonlinear calculation on the whole vehicle by considering contact between components to obtain a stress distribution result of the whole vehicle;
Step e: establishing a whole vehicle modal analysis working condition, adding a quasi-static analysis working condition of the whole vehicle under gravity only as a preload into the whole vehicle modal analysis working condition, carrying out solving calculation by combining a whole vehicle finite element model, and evaluating and analyzing a calculation result of the whole vehicle modal analysis working condition to obtain a second evaluation result;
Step f: establishing a random vibration analysis working condition, adding a quasi-static analysis working condition of the whole vehicle under the gravity force as a preload into the random vibration analysis working condition, solving and calculating by combining finite element models of the battery pack and the battery pack bracket, and evaluating and analyzing a calculation result of the random vibration analysis working condition to obtain a third evaluation result;
Step g: and analyzing and evaluating the performance of the new energy battery pack bracket structure according to the first evaluation result, the second evaluation result and the third evaluation result.
2. The method for analyzing and evaluating the performance of a new energy battery pack bracket structure according to claim 1, wherein the collecting the first acceleration load spectrum at the center of each connecting vertical plate in the whole vehicle specifically comprises:
collecting longitudinal, transverse and vertical three-dimensional vibration acceleration spectrums at the central positions of all connecting vertical plates in the whole vehicle;
the relative displacement spectrum between the acquisition frame and the axle comprises:
collecting the relative displacement spectrum between the frame and the front, middle and rear axles;
The vehicle axle comprises a front axle, a middle axle and a rear axle, and the vehicle frame comprises a front end vehicle frame and a rear end vehicle frame.
3. The method for analyzing and evaluating the performance of a new energy battery pack bracket structure according to claim 2, wherein the whole vehicle comprises a vehicle body, a battery pack bracket, a vehicle frame, a suspension, an axle and a power assembly.
4. The method for analyzing and evaluating the performance of a new energy battery pack bracket structure according to claim 3, wherein each quasi-static analysis working condition is solved and calculated by combining a whole vehicle finite element model, and the method specifically comprises the following steps:
Carrying out drift removal, deburring and filtering treatment on the first acceleration load spectrum, extracting the maximum values of longitudinal, transverse and vertical acceleration in the whole load process, and taking the maximum values as the load of a brake, steering and vertical impact quasi-static analysis working condition;
Carrying out drift removal, deburring and filtering treatment on the relative displacement spectrum, extracting the maximum displacement of the front end frame relative to the front axle in the whole displacement signal process, and taking the maximum displacement of the rear end frame relative to the middle axle and the rear axle as the load of the torsion quasi-static analysis working condition;
carrying out drift removal, deburring and filtering treatment on the second acceleration load spectrum, and extracting the acceleration maximum value of the load process in the whole hoisting process to serve as the load of the hoisting quasi-static analysis working condition;
performing component constraint according to the running condition of the whole vehicle under the quasi-static analysis working conditions of vertical impact, steering, braking and torsion, setting nonlinear analysis load iteration parameters, and solving and calculating by combining a whole vehicle finite element model to obtain a whole vehicle stress distribution result;
The hoisting quasi-static analysis working condition is used for carrying out component constraint according to the process of hoisting the battery pack and the battery pack bracket to the chassis by a whole vehicle factory, setting nonlinear analysis load iteration parameters, and carrying out solving calculation by combining the finite element models of the battery pack and the battery pack bracket to obtain stress distribution results of the battery pack and the battery pack bracket;
the evaluation analysis is performed on the calculation results of each quasi-static analysis working condition to obtain a first evaluation result, and the method specifically comprises the following steps:
Judging whether the safety coefficient of the plate structure is larger than a first preset value or not according to the stress distribution result of the whole vehicle and the stress distribution result of the battery pack and the battery pack bracket, judging whether the safety coefficient of the casting structure is larger than a second preset value or not, and if both the two judgment results are yes, judging that the first evaluation result is passed; if one of the evaluation results is judged to be not passed, the first evaluation result is not passed;
wherein, the plate structure comprises a part with uniform plate thickness in the whole vehicle; the casting structure comprises castings with non-uniform plate thickness in the whole vehicle; coefficient of safety = yield strength/stress.
5. The method for analyzing and evaluating the performance of a new energy battery pack bracket structure according to claim 1, wherein the step d specifically comprises:
Establishing a quasi-static analysis working condition when the whole vehicle is only subjected to gravity, performing component constraint according to the whole vehicle only subjected to the gravity working condition, setting nonlinear analysis load iteration parameters, combining a whole vehicle finite element model, and performing whole vehicle nonlinear calculation by considering contact between components to obtain a whole vehicle stress distribution result.
6. The method for analyzing and evaluating the performance of the new energy battery pack bracket structure according to claim 1, wherein the solving and calculating by combining the whole vehicle finite element model in the step e specifically comprises:
the method comprises the steps of adding a quasi-static analysis working condition of the whole vehicle when the whole vehicle is only subjected to gravity into a mode analysis working condition of the whole vehicle as a preload, carrying out component constraint according to the running condition of the whole vehicle, and carrying out solving calculation by combining a finite element model of the whole vehicle to obtain the mode shape and the mode frequency of the whole vehicle;
the evaluation analysis of the calculation result of the whole vehicle modal analysis working condition, and the second evaluation result is obtained, specifically comprising:
selecting an elastic mode belonging to a battery pack bracket from the mode shape of the whole vehicle, and recording the mode frequency of the battery pack bracket;
converting the first acceleration load spectrum into a PSD spectrum and recording the frequencies of a plurality of PSD peak signals;
Acquiring a plurality of frequency ranges according to the frequencies of the PSD peak signals;
Judging whether the modal frequency of the battery pack bracket is smaller than the minimum value in the frequencies of the PSD peak signals, judging whether the modal frequency of the battery pack bracket is in a plurality of frequency ranges, and if both the modal frequency and the frequency are not in the same frequency range, judging that the second evaluation result is passed; if one of the evaluation results is yes, the second evaluation result is not passed.
7. The method for analyzing and evaluating the performance of a new energy battery pack bracket according to claim 1, wherein the solving and calculating are performed by combining a battery pack and a finite element model of the battery pack bracket in the step f, specifically comprising:
Establishing modal frequency response analysis working conditions;
Applying longitudinal, transverse and vertical unit load spectrum excitation at each connecting vertical plate position, extracting the modes of the finite element models of the battery pack and the battery pack bracket, taking the quasi-static analysis working condition of the whole vehicle only under gravity as a preload to be added into the modal frequency response analysis working condition, setting the damping of the finite element models of the battery pack and the battery pack bracket, and carrying out solving calculation in the longitudinal, transverse and vertical directions by combining the finite element models of the battery pack and the battery pack bracket;
Establishing a random vibration analysis working condition, substituting a modal frequency response analysis working condition into the random vibration analysis working condition, converting a first acceleration load spectrum into a PSD spectrum, introducing the PSD spectrum into the random vibration analysis working condition, combining a battery pack and a finite element model of a battery pack support, carrying out solving calculation to obtain a1 sigma stress field of the battery pack support in three loading directions, and obtaining the maximum 1 sigma stress of the battery pack support in the three loading directions;
The evaluation analysis is performed on the calculation result of the random vibration analysis working condition to obtain a third evaluation result, and the method specifically comprises the following steps:
If three times of the maximum 1 sigma stress of the battery pack bracket in the three loading directions exceeds the yield strength of the battery pack bracket, the third evaluation result is that the battery pack bracket does not pass; if three times the maximum 1 sigma stress of the battery pack holder in the three loading directions does not exceed the yield strength of the battery pack holder, the third evaluation result is passed.
8. The method for analyzing and evaluating the performance of the new energy battery pack bracket structure according to claim 1, wherein the analyzing and evaluating the performance of the new energy battery pack bracket structure specifically comprises:
if the first evaluation result, the second evaluation result and the third evaluation result are all passed, evaluating that the performance of the battery pack bracket structure meets the requirement;
otherwise, evaluating the structural performance of the battery pack bracket is not satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410568409.7A CN118153208B (en) | 2024-05-09 | 2024-05-09 | New energy battery pack bracket structure performance analysis and evaluation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410568409.7A CN118153208B (en) | 2024-05-09 | 2024-05-09 | New energy battery pack bracket structure performance analysis and evaluation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118153208A true CN118153208A (en) | 2024-06-07 |
| CN118153208B CN118153208B (en) | 2024-07-05 |
Family
ID=91298824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410568409.7A Active CN118153208B (en) | 2024-05-09 | 2024-05-09 | New energy battery pack bracket structure performance analysis and evaluation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118153208B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110119577A (en) * | 2019-05-17 | 2019-08-13 | 江铃汽车股份有限公司 | A method of extracting pure electric vehicle truck batteries bag bracket structure load spectrum |
| CN112163351A (en) * | 2020-08-05 | 2021-01-01 | 珠海广通汽车有限公司 | Simulation analysis method and device for battery bracket |
| CN114491825A (en) * | 2022-04-15 | 2022-05-13 | 岚图汽车科技有限公司 | Automobile fender vibration intensity analysis method |
| CN115169168A (en) * | 2022-05-31 | 2022-10-11 | 中国第一汽车股份有限公司 | Simulation calculation method for multi-axis random vibration strength and fatigue damage of vehicle body cantilever structure, storage medium and electronic device |
| CN115481485A (en) * | 2022-09-06 | 2022-12-16 | 重庆长安汽车股份有限公司 | General analysis method and device for strength of automobile mounting bracket and storage medium |
-
2024
- 2024-05-09 CN CN202410568409.7A patent/CN118153208B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110119577A (en) * | 2019-05-17 | 2019-08-13 | 江铃汽车股份有限公司 | A method of extracting pure electric vehicle truck batteries bag bracket structure load spectrum |
| CN112163351A (en) * | 2020-08-05 | 2021-01-01 | 珠海广通汽车有限公司 | Simulation analysis method and device for battery bracket |
| CN114491825A (en) * | 2022-04-15 | 2022-05-13 | 岚图汽车科技有限公司 | Automobile fender vibration intensity analysis method |
| CN115169168A (en) * | 2022-05-31 | 2022-10-11 | 中国第一汽车股份有限公司 | Simulation calculation method for multi-axis random vibration strength and fatigue damage of vehicle body cantilever structure, storage medium and electronic device |
| CN115481485A (en) * | 2022-09-06 | 2022-12-16 | 重庆长安汽车股份有限公司 | General analysis method and device for strength of automobile mounting bracket and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 汪谟清;沈磊;徐娟;王良模;: "随机振动疲劳分析的某商用车悬挂件改进设计", 轻型汽车技术, no. 03, 15 March 2015 (2015-03-15), pages 14 - 19 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118153208B (en) | 2024-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106644512B (en) | Noise analysis approach and system based on power assembly load | |
| CN114091176A (en) | Vehicle dynamics model calibration method based on time domain and frequency domain states | |
| CN113343374A (en) | Automobile plate spring fatigue testing method | |
| CN113449376B (en) | Method, system and equipment for selecting shock absorber of suspension equipment under train | |
| CN118153208B (en) | New energy battery pack bracket structure performance analysis and evaluation method | |
| Chinnaraj et al. | Experimental analysis and quasi-static numerical idealization of dynamic stresses on a heavy truck chassis frame assembly | |
| Zhou et al. | Fatigue Analysis of a Light Truck Rear Axle Based on Virtual Iteration Method | |
| Deulgaonkar | Analysis of vibration characteristics of transport utility vehicle by finite element method | |
| CN111125953A (en) | Method for optimizing morphology of spare tire pit | |
| Mohite | Stress analysis and optimization of front wheel hub | |
| Uhlar | Simulating and optimizing the dynamic chassis forces of the Audi e-tron | |
| Pan et al. | Lightweight design of an electric tricycle frame considering dynamic stress in driving conditions | |
| CN111241724B (en) | Fatigue life prediction method for wide-body mining vehicle frame | |
| CN114329772A (en) | Rail vehicle frame and design method and device thereof | |
| CN113155486A (en) | Durability simulation test method and system for power assembly suspension system | |
| Kagnici | Vibration induced fatigue assessment in vehicle development process | |
| Sakuma et al. | Heavy duty truck ride–comfort analysis by computer simulation | |
| Galvagno et al. | Experimental-Numerical Correlation of a Multi-Body Model for Comfort Analysis of a Heavy Truck | |
| Yu et al. | Design of the Lower Control Arm of an Electric SUV Front Suspension Based on Multi-Disciplinary Optimization Technology. | |
| Pečeliūnas et al. | Experimental research into motor vehicle oscillations in the case of changeable deceleration | |
| Tajiri et al. | Modal identification of motorcycle tires using circumferential wave number decomposition | |
| CN117786830A (en) | Simulation analysis method for vehicle body suspension | |
| Rauber et al. | Optimization of steering knuckle geometry of an off-road vehicle applying DoE | |
| Kanunje et al. | Fatigue analysis & optimization of suspension bracket of light passenger vehicles | |
| Anthonysamy et al. | Develop the Methodology to Predict the Engine Mount Loads from Road Load Data Using MSC ADAMS and FEMFAT Virtual Iteration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |