CN115982859A - Lightweight simulation analysis system and method for temperature-controllable vehicle power battery box - Google Patents
Lightweight simulation analysis system and method for temperature-controllable vehicle power battery box Download PDFInfo
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- CN115982859A CN115982859A CN202310056659.8A CN202310056659A CN115982859A CN 115982859 A CN115982859 A CN 115982859A CN 202310056659 A CN202310056659 A CN 202310056659A CN 115982859 A CN115982859 A CN 115982859A
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Abstract
The application discloses but be used for automobile-used power battery case lightweight simulation analysis system of control by temperature change and method, wherein the system includes: the system comprises a model building module, an analysis module, a structure optimization module and a simulation module; the model building module is used for building a finite element model of the power battery box; the analysis module is used for carrying out structural key point analysis, static strength analysis and modal analysis based on the finite element model to obtain structural key points, static strength analysis results and modal analysis results; the structure optimization module is used for carrying out lightweight design based on the structural key points, the static strength analysis result and the modal analysis result to obtain an optimized power battery box model; and the simulation module is used for constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying, analyzing and optimizing the safety performance of the optimized power battery box model. According to the method and the device, a standardized simulation method and an optimized design tool can be provided for the new energy automobile, and the experiment cost is reduced.
Description
Technical Field
The application relates to the field of simulation of vehicle power battery boxes, in particular to a light-weight simulation analysis system and method for a vehicle power battery box capable of controlling temperature.
Background
For electric vehicles, a critical component affecting safety performance is the battery pack. The battery box is used as a carrier of the power battery, plays a key role in the safety and protection of the battery pack, and therefore has important significance in research on the power battery box. Structural strength and lightweight need be considered multipurposely in the design of battery box, this is a system engineering, has certain degree of difficulty. The lightweight battery box at home and abroad is optimized from a single angle of improving strength, rigidity and natural frequency, and although various indexes are improved, the lightweight effect is limited. The project solves the problem of light weight design of the battery box systematically at multiple angles based on multiple optimization technologies and composite material mechanics theories, provides a temperature control-based safety comprehensive test system for the vehicle power battery box, obtains contact data of the battery box and a rigid body and contact data of the battery box and the power battery in collision contact through a temperature control-based collision test of the vehicle power battery box, and comprehensively reflects the comprehensive protection performance of the battery box body on the power battery.
Disclosure of Invention
The application provides a light-weight simulation analysis system and method for a temperature-controllable vehicle power battery box, wherein the light-weight design is carried out on the battery box by using a finite element method, and the influence of the optimized structural components on the overall static and dynamic performance of the battery box and the impact resistance of the optimized structure on an energy absorption component are discussed.
In order to achieve the above purpose, the present application provides the following solutions:
a but be used for automobile-used power battery case lightweight simulation analysis system of control by temperature change includes: the system comprises a model building module, an analysis module, a structure optimization module and a simulation module;
the model building module is used for building a finite element model of the power battery box;
the analysis module is used for carrying out structural key point analysis, static strength analysis and modal analysis based on the finite element model to obtain structural key points, static strength analysis results and modal analysis results;
the structure optimization module is used for carrying out lightweight design based on the structure key points, the static strength analysis result and the modal analysis result to obtain an optimized power battery box model;
and the simulation module is used for constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying and analyzing the safety performance of the optimized power battery box model.
Preferably, the method for constructing the finite element model includes:
constructing a geometric model of the power battery box;
carrying out distortion defect cleaning based on the geometric model to obtain a cleaned power battery box model;
and selecting unit types based on the cleaned power battery box model, and performing grid division and grid quality control to obtain the finite element model.
Preferably, the method for analyzing and obtaining the structural key points comprises:
carrying out frequency response analysis on the finite element model under unit acceleration load to obtain stress distribution of the finite element model on each order of frequency;
and analyzing the fatigue life based on the stress distribution to obtain the structure key points.
Preferably, the method of static strength analysis comprises:
and applying load to the finite element model by adopting a refined model, and analyzing the displacement and stress difference of the finite element model to obtain the static strength analysis result.
Preferably, the method of modal analysis comprises:
and applying different natural frequency vibrations to the finite element model, analyzing the vibration position of the finite element model when no boundary constraint condition is applied, and analyzing the vibration performance of the finite element model when the boundary constraint condition is applied to obtain the modal analysis result.
Preferably, the method of designing for light weight includes:
performing topology optimization based on the structural key points, the static strength analysis result and the modal analysis result to determine optimal material distribution;
and performing morphology optimization and size optimization based on the structural key points and the modal analysis result, and determining the optimal combination relationship of the optimal reinforcement position distribution, the optimal size of the structural assembly and the material performance.
Preferably, the collision simulation method includes:
setting a test lane, a simulated vehicle carrying the optimized power battery box model and rigid impact bodies in different shapes based on the whole vehicle collision model;
the simulated vehicle travels on the test lane in a non-uniform speed traveling mode;
during the running process of the simulated vehicle, the rigid impact body is randomly placed on the test lane, so that the simulated vehicle impacts the rigid impact body;
and acquiring the deformation data of the optimized power battery box model after impact to complete the collision simulation.
The application also provides a lightweight simulation analysis method for the temperature-controllable vehicle power battery box, which comprises the following steps:
constructing a finite element model of the power battery box;
performing structural key point analysis, static strength analysis and modal analysis based on the finite element model to obtain structural key points, static strength analysis results and modal analysis results;
carrying out lightweight design based on the structural key points, the static strength analysis result and the modal analysis result to obtain an optimized power battery box model;
and constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying and analyzing the safety performance of the optimized power battery box model.
The beneficial effect of this application does:
the method can provide standardized, flow-based and diversified simulation methods and optimized design tools for the new energy automobile, reduce the experiment cost and accelerate the design and development cycle of products; the upgrading and updating of the research and development technology of key parts of the new energy automobile can be promoted, the safety and the reliability of the new energy automobile are improved, the life and property safety of people is guaranteed, the healthy development of the new energy automobile industry is facilitated in the long run, and huge economic benefits and good social benefits are brought.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a system according to a first embodiment of the present application;
fig. 2 is a schematic flow chart of a method according to a second embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Example one
In the first embodiment, as shown in fig. 1, a temperature-controllable lightweight simulation analysis system for a vehicle power battery box includes: the system comprises a model building module, an analysis module, a structure optimization module and a simulation module.
The model building module is used for building a finite element model of the power battery box. The construction method of the finite element model comprises the following steps: constructing a geometric model of the power battery box; carrying out distortion defect cleaning based on the geometric model to obtain a cleaned power battery box model; and selecting unit types based on the cleaned power battery box model, and performing grid division and grid quality control to obtain a finite element model.
In this embodiment, a geometric model of the power battery box is constructed by using CATIA geometric modeling software by an indirect method, and because the power battery box has a complex structure, in order to reduce the data volume during subsequent analysis and processing, the geometric model of the power battery box is simplified, and main mechanical features and structural features are retained, that is, secondary features (such as small-sized assembly process holes, excessive fillets and the like) in a non-bearing construction and neglected structure are omitted; after the geometric model is built, the situations of data distortion and image distortion still exist, the distortion defects need to be processed, such as redundant and overlapped surfaces are deleted, overlapped and misplaced images are eliminated, the cleaned power battery box model is obtained, then the cleaned power battery box model is subjected to unit type selection by using Hypermesh software, four-node straight-edge unit division is used, after the unit selection is completed, grid division is carried out by integrating calculation precision and calculation speed, the grid number is determined, and the finite element model is obtained.
The analysis module is used for carrying out structural key point analysis, static strength analysis and modal analysis based on the finite element model to obtain structural key points, static strength analysis results and modal analysis results. The method for analyzing and obtaining the structural key points comprises the following steps: carrying out frequency response analysis on the finite element model under unit acceleration load to obtain stress distribution of the finite element model on each order of frequency, and carrying out fatigue life analysis based on the stress distribution to obtain structural key points; the method for static intensity analysis comprises the following steps: applying load to the finite element model by adopting a refined model, and analyzing the displacement and stress difference of the finite element model to obtain a static strength analysis result; the modal analysis method comprises the following steps: and applying different natural frequency vibrations to the finite element model, analyzing the vibration position of the finite element model when boundary constraint conditions are not applied, and analyzing the vibration performance of the finite element model when the boundary constraint conditions are applied to obtain a modal analysis result.
In this embodiment, MSC nanostran software is used to perform frequency response analysis on the finite element model, select a suitable excitation node, apply the load of acceleration to the X, Y, and Z directions of the node, and correspondingly analyze the frequencies in the three directions to obtain the stress distribution on the finite element model, where the maximum stress is the key position for load bearing and connection, i.e., the structural key point.
In this embodiment, a refined model is used to apply a load to the finite element model, a refined model displacement cloud chart and a refined model stress cloud chart are generated, and displacement and stress difference analysis is performed based on the displacement cloud chart and the stress cloud chart, so as to obtain a static strength analysis result.
In this embodiment, the power battery box may generate resonance under excitation of a certain external frequency, so modal analysis is required, different vibration frequencies are applied to the finite element model in Optistruct software to obtain a vibration mode image, and a vibration position is obtained by analyzing the vibration mode image at different vibration frequencies; and then, on the basis of the degree of freedom of the constraint node, applying different vibration frequencies to the finite element model to obtain a vibration mode image, and analyzing the vibration mode image under different vibration frequencies to obtain the vibration performance.
And the structure optimization module is used for carrying out lightweight design based on the structural key points, the static strength analysis result and the modal analysis result to obtain an optimized power battery box model. The method for designing the light weight includes: performing topology optimization based on the structural key points, the static strength analysis result and the modal analysis result to determine the optimal material distribution; and performing morphology optimization and size optimization based on the structural key points and the modal analysis result, and determining the optimal combination relationship of the optimal reinforcement position distribution, the optimal size of the structural assembly and the material performance.
And the simulation module is used for constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying, analyzing and optimizing the safety performance of the optimized power battery box model. The collision simulation method comprises the following steps: setting a test lane, a simulated vehicle carrying the optimized power battery box model and rigid impact bodies in different shapes based on the whole vehicle collision model; simulating the vehicle to advance on the test lane in a non-uniform speed advancing mode; in the running process of the simulated vehicle, the rigid impact body is randomly placed on a test lane, so that the simulated vehicle impacts the rigid impact body; and acquiring deformation data of the optimized power battery box model after impact to complete collision simulation.
In the present embodiment, a simulated test lane is provided to satisfy the requirement of simulating high-speed travel of the vehicle. By adopting the elliptical annular lane, the simulated vehicle can be ensured to travel on the lane at different speeds. Meanwhile, rigid bodies in different shapes are arranged at different positions of the lane, and can randomly appear on the simulation test lane, so that the simulation vehicle can impact on the rigid bodies. During testing, the simulated vehicle travels on the simulated test lane in a non-uniform speed state. The rigid body is randomly placed on a test lane, and the condition that the vehicle directly impacts the rigid body is simulated. And acquiring deformation data of the power battery box model in the impact process, comparing the deformation data with a safe impact target, and continuously optimizing the structure of the power battery box model until the impact test is met to obtain a final power battery box design scheme.
Example two
In the second embodiment, as shown in fig. 2, the method for simulating and analyzing the light weight of the temperature-controllable power battery box for the vehicle includes the following steps:
s1, constructing a finite element model of the power battery box. The construction method of the finite element model comprises the following steps: constructing a geometric model of the power battery box; carrying out distortion defect cleaning based on the geometric model to obtain a cleaned power battery box model; and selecting the unit type based on the cleaned power battery box model, and performing grid division and grid quality control to obtain a finite element model.
In this embodiment, a geometric model of the power battery box is constructed by using CATIA geometric modeling software by an indirect method, and because the power battery box has a complex structure, in order to reduce the data volume during subsequent analysis and processing, the geometric model of the power battery box is simplified, and main mechanical features and structural features are retained, that is, secondary features (such as small-sized assembly process holes, excessive fillets and the like) in a non-bearing construction and neglected structure are omitted; after the geometric model is built, the data distortion and the image distortion still exist, the distortion defects need to be processed, such as redundant and coincident surfaces are deleted, overlapped and misplaced images are eliminated, the cleaned power battery box model is obtained, then the cleaned power battery box model is subjected to unit type selection by using Hypermesh software, four-node straight edge unit division is used, after the unit selection is completed, grid division is carried out by comprehensively calculating precision and speed, the grid number is determined, and the finite element model is obtained.
And S2, carrying out structural key point analysis, static strength analysis and modal analysis on the finite element model to obtain structural key points, a static strength analysis result and a modal analysis result. The method for analyzing and obtaining the structural key points comprises the following steps: carrying out frequency response analysis on the finite element model under unit acceleration load to obtain stress distribution of the finite element model on each order of frequency, and carrying out fatigue life analysis based on the stress distribution to obtain structural key points; the method of static intensity analysis comprises: applying load to the finite element model by adopting a refined model, and analyzing the displacement and stress difference of the finite element model to obtain a static strength analysis result; the method for modal analysis comprises the following steps: and applying different natural frequency vibrations to the finite element model, analyzing the vibration position of the finite element model when no boundary constraint condition is applied, and analyzing the vibration performance of the finite element model when the boundary constraint condition is applied to obtain a modal analysis result.
In this embodiment, MSC nanostran software is used to perform frequency response analysis on the finite element model, select a suitable excitation node, apply the load of acceleration to the X, Y, and Z directions of the node, and correspondingly analyze the frequencies in the three directions to obtain the stress distribution on the finite element model, where the maximum stress is the key position for load bearing and connection, i.e., the structural key point.
In this embodiment, a refined model is used to apply a load to the finite element model, a refined model displacement cloud chart and a refined model stress cloud chart are generated, and displacement and stress difference analysis is performed based on the displacement cloud chart and the stress cloud chart, so as to obtain a static strength analysis result.
In this embodiment, the power battery box may generate resonance under excitation of a certain external frequency, so modal analysis is required, different vibration frequencies are applied to the finite element model in Optistruct software to obtain a vibration mode image, and a vibration position is obtained by analyzing the vibration mode image at different vibration frequencies; and then, on the basis of the degree of freedom of the constraint node, applying different vibration frequencies to the finite element model to obtain a vibration mode image, and analyzing the vibration mode image under different vibration frequencies to obtain the vibration performance.
And S3, carrying out lightweight design based on the structural key points, the static strength analysis result and the modal analysis result to obtain the optimized power battery box model. The method for designing the light weight includes: performing topology optimization based on the structural key points, the static strength analysis result and the modal analysis result to determine the optimal material distribution; and performing morphology optimization and size optimization based on the structural key points and the modal analysis result, and determining the optimal combination relationship of the optimal reinforcement position distribution, the optimal size of the structural assembly and the material performance.
And S4, constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying, analyzing and optimizing the safety performance of the optimized power battery box model. The collision simulation method comprises the following steps: setting a test lane, a simulated vehicle carrying the optimized power battery box model and rigid impact bodies in different shapes based on the whole vehicle collision model; simulating the vehicle to advance on the test lane in a non-uniform speed advancing mode; in the running process of the simulated vehicle, the rigid impact body is randomly placed on a test lane, so that the simulated vehicle impacts the rigid impact body; and acquiring deformation data of the optimized power battery box model after impact to complete collision simulation.
In the present embodiment, a simulation test lane is provided to satisfy the simulation of high-speed traveling of the vehicle. By adopting the elliptical annular lane, the simulated vehicle can be ensured to travel on the lane at different speeds. Meanwhile, rigid bodies in different shapes are arranged at different positions of the lane, and can randomly appear on the simulation test lane, so that the simulation vehicle can impact on the rigid bodies. During testing, the simulated vehicle travels on the simulated test lane in a non-uniform speed state. The rigid body is randomly placed on a test lane, and the condition that the vehicle impacts the rigid body is simulated. And acquiring deformation data of the power battery box model in the impact process, comparing the deformation data with a safe impact target, and continuously optimizing the structure of the power battery box model until the impact test is met to obtain a final power battery box design scheme.
The above-described embodiments are merely illustrative of the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the spirit of the present application should fall within the protection scope defined by the claims of the present application.
Claims (8)
1. A but be used for automobile-used power battery case lightweight simulation analysis system of control by temperature change, its characterized in that includes: the system comprises a model building module, an analysis module, a structure optimization module and a simulation module;
the model building module is used for building a finite element model of the power battery box;
the analysis module is used for carrying out structural key point analysis, static strength analysis and modal analysis based on the finite element model to obtain structural key points, static strength analysis results and modal analysis results;
the structure optimization module is used for carrying out lightweight design based on the structure key points, the static strength analysis result and the modal analysis result to obtain an optimized power battery box model;
and the simulation module is used for constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying and analyzing the safety performance of the optimized power battery box model.
2. The system for simulating and analyzing the lightweight of the temperature-controllable vehicle power battery box according to claim 1, wherein the method for constructing the finite element model comprises the following steps:
constructing a geometric model of the power battery box;
carrying out distortion defect cleaning based on the geometric model to obtain a cleaned power battery box model;
and selecting unit types based on the cleaned power battery box model, and performing grid division and grid quality control to obtain the finite element model.
3. The system for simulating and analyzing the lightweight of the temperature-controllable vehicle power battery box according to claim 1, wherein the method for analyzing and obtaining the structural key points comprises:
performing frequency response analysis on the finite element model under unit acceleration load to obtain stress distribution of the finite element model on each order of frequency;
and analyzing the fatigue life based on the stress distribution to obtain the structure key point.
4. The system for simulating and analyzing the lightweight of the temperature-controllable vehicle power battery box according to claim 1, wherein the method for analyzing the static strength comprises the following steps:
and applying load to the finite element model by adopting a refined model, and analyzing the displacement and stress difference of the finite element model to obtain the static strength analysis result.
5. The system for simulating and analyzing the lightweight of the temperature-controllable vehicle power battery box according to claim 1, wherein the modal analysis method comprises:
and applying different natural frequency vibrations to the finite element model, analyzing the vibration position of the finite element model when no boundary constraint condition is applied, and analyzing the vibration performance of the finite element model when the boundary constraint condition is applied to obtain the modal analysis result.
6. The system for simulating and analyzing the light weight of the temperature-controllable vehicle power battery box according to claim 1, wherein the method for designing the light weight comprises:
performing topology optimization based on the structural key points, the static strength analysis result and the modal analysis result to determine optimal material distribution;
and performing morphology optimization and size optimization based on the structural key points and the modal analysis result, and determining the optimal combination relationship of the optimal reinforcement position distribution, the optimal size of the structural component and the material performance.
7. The temperature-controllable vehicle power battery box lightweight simulation analysis system according to claim 1, wherein the collision simulation method comprises the following steps:
setting a test lane, a simulated vehicle carrying the optimized power battery box model and rigid impact bodies in different shapes based on the whole vehicle collision model;
the simulated vehicle travels on the test lane in a non-uniform speed traveling mode;
during the running process of the simulated vehicle, the rigid impact body is randomly placed on the test lane, so that the simulated vehicle impacts the rigid impact body;
and acquiring the deformation data of the optimized power battery box model after impact to complete the collision simulation.
8. A light weight simulation analysis method for a temperature-controllable vehicle power battery box is characterized by comprising the following steps:
constructing a finite element model of the power battery box;
performing structural key point analysis, static strength analysis and modal analysis based on the finite element model to obtain structural key points, static strength analysis results and modal analysis results;
carrying out lightweight design based on the structural key points, the static strength analysis result and the modal analysis result to obtain an optimized power battery box model;
and constructing a whole vehicle collision model based on the optimized power battery box model, performing collision simulation based on the whole vehicle collision model, and verifying and analyzing the safety performance of the optimized power battery box model.
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