Backpack battery frame optimization method, system and device based on vehicle chassis

Abstract

The invention relates to the technical field of vehicle chassis, and discloses a backpack type battery frame optimization method, system and device based on a vehicle chassis, and the method comprises the steps: constructing a backpack type battery frame grid model; the method comprises the following steps: acquiring part structure and material parameters, calculating stress of a battery at different load position offsets by utilizing mechanical calculation software, and fitting the stress and the load position offsets to establish a load spectrum; defining boundary conditions of the backpack battery frame grid model, and loading the model by giving displacement, stress and acceleration; combining the knapsack battery frame grid model with the whole vehicle model, and importing the combined model into a load spectrum for iterative calculation; and judging whether the calculation is accurate or not by comparing the calculation result with the actual operation condition until the calculation result is consistent with the actual condition. According to the scheme, the calculation of the knapsack framework can be accurately optimized by combining the modeling and the load spectrum. And under the optimization, the design efficiency is improved, so that the calculation accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle chassis, and in particular to a method, system and device for optimizing a backpack battery frame based on a vehicle chassis. Background Art

[0002] Patent document 1 (CN201910109552.9) provides a battery frame durability analysis method, which only involves the battery frame durability analysis process, cannot judge the accuracy of the calculation, and has no optimization means to ensure the accuracy of the model. Patent document 2 (CN202311720973.8) discloses a method for improving the accuracy of the enhanced load spectrum using CAE technology. This technology tends to use the load spectrum and cannot correct the finite element model itself, which easily polarizes the results and causes the calculation results to deviate from the actual results.

[0003] The backpack battery frame vehicle frame system itself should have sufficient strength and reasonable rigidity to ensure that the stress of each part of the frame structure is within a reasonable range under various operating conditions, so that the relative positions of the related components installed thereon remain basically unchanged during the driving of the car, and its own deformation is minimized. Otherwise, it will affect the reliability of its external parts and even cause damage to the frame such as deformation and breakage, or affect the normal functioning of these components.

[0004] The backpack frame system has many design structures and variables. Currently, the strength and stiffness analysis of the frame structure requires repeated calculations. The optimization process is time-consuming and labor-intensive. There is a lack of effective optimization solutions, and it is difficult to obtain the optimal solution. At the same time, there is a lack of effective actual load spectrum boundary conditions, which leads to risks in the optimal solution obtained by design, resulting in repeated designs.

[0005] The design calculation model itself is not very accurate due to many factors such as multiple structures, multiple variables, and multiple boundary conditions. The repeated iterations of a single variable can easily deviate from the actual results. Summary of the invention

[0006] In order to solve and remedy the above-mentioned defects, the purpose of the present invention is to provide a backpack battery frame optimization method, system and device based on the vehicle chassis, which optimizes and iterates the model itself while combining the load spectrum to ensure the accuracy of the calculation results, thereby solving the problem of excessive deviation between the calculation results of the backpack battery frame and the actual results.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, the present application provides a method for optimizing a backpack battery frame based on a vehicle chassis, the method comprising:

[0009] Construct a backpack battery frame grid model;

[0010] By obtaining the structure and material parameters of the parts, the stress of the battery at different load position offsets is calculated using mechanical calculation software, and the force and load position offset are fitted to establish the load spectrum;

[0011] Defining the boundary conditions of the backpack battery frame grid model, and loading the model by assigning displacement, stress and acceleration;

[0012] Combine the backpack battery frame grid model with the vehicle model and import it into the load spectrum for iterative calculation;

[0013] By comparing the calculation results with the actual operation situation, determine whether the calculation is accurate until the calculation results are consistent with the actual situation.

[0014] Optionally, the constructing of the backpack battery frame grid model includes: grid modeling the backpack battery frame structure; dividing the backpack battery frame structure into two-dimensional grids and three-dimensional grids according to the part features of the backpack battery frame, processing the welding part by weld modeling, generating different grid models, and selecting entity attributes of different grid models for assignment;

[0015] Wherein, the backpack battery frame comprises a backpack frame, a battery and a vehicle frame;

[0016] The entity attributes of the grid model include rigid body unit, entity unit, plate unit and mass unit attributes;

[0017] The backpack battery frame grid model is simplified and the model construction is completed after simplification.

[0018] Optionally, the simplification of the backpack battery frame mesh model includes: mass point simplification, bolt simplification and contact simplification;

[0019] The mass point simplification refers to converting the model into a mass point; the mass point is located at the point where the center of gravity of the battery is the same as the weight;

[0020] The bolt simplification refers to changing the common bolt preload connection form into a rigid body connection;

[0021] The contact simplification refers to adding a contact connection rather than a rigid connection between two planes with contact force.

[0022] Optionally, the boundary conditions are formulated based on the actual stress conditions of the backpack battery frame, which include stress positions and displacement positions; the displacement position is the position where the battery frame is tied to the frame; the stress position is the position of the connection point between the battery and the frame where the battery is installed on the battery frame.

[0023] Optionally, combining the backpack battery frame grid model with the whole vehicle model and importing the load spectrum for iterative calculation includes: based on the whole vehicle model, importing the load spectrum to simulate the vehicle operation, and importing the back battery frame into the whole vehicle model for iterative calculation, and exporting the calculated stress results.

[0024] Optionally, judging whether the calculation is accurate by comparing the calculation result with the actual operation situation until the calculation result is consistent with the actual situation includes:

[0025] If the calculated stress result is inconsistent with the stress position measured by the actual load spectrum, it is determined whether the inconsistent deviation data amount exceeds the preset threshold; when the deviation data amount exceeds the preset threshold, adjustments are made to the two-dimensional and three-dimensional mesh quality, rigid unit, solid unit properties, and connection methods to make the calculation results converge to the actual load spectrum.

[0026] In a second aspect, the present application provides a backpack battery frame optimization system based on a vehicle chassis, the system comprising:

[0027] A construction module for building a piggyback battery frame grid model;

[0028] The first calculation module is used to obtain the part structure and material parameters, calculate the stress of the battery at different load position offsets using mechanical calculation software, and fit the force and load position offset to establish a load spectrum;

[0029] The loading module is used to define the boundary conditions of the backpack battery frame grid model and load the model by assigning displacement, stress and acceleration;

[0030] The second calculation module is used to combine the backpack battery frame grid model with the vehicle model and import it into the load spectrum for iterative calculation;

[0031] The adjustment module is used to determine whether the calculation is accurate by comparing the calculation results with the actual operation conditions, until the calculation results are consistent with the actual conditions.

[0032] Optionally, the building blocks include:

[0033] A construction unit is used to perform mesh modeling on the backpack battery frame structure. According to the part features of the backpack battery frame, the backpack battery frame structure is divided into two-dimensional meshes and three-dimensional meshes, the weld part is processed by weld modeling, different mesh models are generated, and entity attributes of different mesh models are selected for assignment;

[0034] Wherein, the backpack battery frame comprises a backpack frame, a battery and a vehicle frame;

[0035] The entity attributes of the grid model include rigid body unit, entity unit, plate unit and mass unit attributes;

[0036] The simplified unit is used to simplify the backpack battery frame grid model and complete the model construction after simplification.

[0037] In a third aspect, the present application further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the method steps as described in any one of the first aspects.

[0038] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0039] The beneficial effects of the present invention are embodied in:

[0040] The present invention provides a backpack battery frame optimization method, system and device based on the vehicle chassis, the purpose of which is to improve the design efficiency and obtain a relatively accurate solution through this optimization method. It includes constructing a backpack battery frame grid model; by obtaining the part structure and material parameters, using mechanical calculation software to calculate the stress of the battery at different load position offsets, and fitting the force and load position offset to establish a load spectrum; defining the boundary conditions of the backpack battery frame grid model, and loading the model by assigning displacement, stress and acceleration; combining the backpack battery frame grid model with the whole vehicle model, importing it into the load spectrum for iterative calculation; by comparing the calculation results with the actual operation situation, judging whether the calculation is accurate, until the calculation results are consistent with the actual situation.

[0041] The above invention combines the load spectrum and optimizes and iterates the model itself to ensure the accuracy of the calculation results, thereby solving the problem that the calculation results of the backpack battery frame deviate too much from the actual results. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0043] Figure 1 A flow chart of a backpack battery frame optimization method based on a vehicle chassis provided by the present invention;

[0044] Figure 2A schematic diagram of a backpack battery frame optimization process based on a vehicle chassis provided by the present invention;

[0045] Figure 3 A cross-sectional schematic diagram of a backpack battery frame provided by the present invention;

[0046] Figure 4 A schematic structural diagram of a backpack battery frame optimization system based on a vehicle chassis provided by the present invention;

[0047] Figure 5 The present invention provides a schematic structural diagram of an electronic device. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0049] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0050] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0052] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0053] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0054] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0055] The embodiment of the present application provides a backpack battery frame optimization method, system and device based on a vehicle chassis, which is mainly used in a vehicle system; the method can be applied to a terminal, a server, or a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. The terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, etc.

[0056] The backpack battery frame optimization method based on the vehicle chassis provided in the embodiment of the present application is intended to solve the many defects of the existing backpack frame structure calculation model. While combining the load spectrum, the model itself is optimized and iterated to ensure the accuracy of the calculation results.

[0057] Reference Figure 1 and Figure 2 , an embodiment of the present invention provides a backpack battery frame optimization method based on a vehicle chassis, the method comprising:

[0058] S101 builds a backpack battery frame grid model;

[0059] S102 obtains part structure and material parameters, calculates the stress of the battery at different load position offsets using mechanical calculation software, and fits the force and load position offset to establish a load spectrum;

[0060] S103 defines the boundary conditions of the backpack battery frame grid model, and loads the model by assigning displacement, stress, and acceleration;

[0061] S104 combines the backpack battery frame grid model with the vehicle model and imports it into the load spectrum for iterative calculation;

[0062] S105 determines whether the calculation is accurate by comparing the calculation result with the actual operation situation, until the calculation result is consistent with the actual situation.

[0063] In the above embodiment, the step S101 of constructing a backpack battery frame grid model includes:

[0064] Conduct mesh modeling on the backpack battery frame structure; divide the backpack battery frame structure into two-dimensional meshes and three-dimensional meshes according to the part features of the backpack battery frame, use weld modeling to process the welding part, generate different mesh models, and select entity attributes of different mesh models for assignment;

[0065] like Figure 3 As shown, the backpack battery frame includes a battery 110, a backpack frame 120 and a vehicle frame 130;

[0066] The entity attributes of the grid model include rigid body unit, entity unit, plate unit and mass unit attributes;

[0067] The backpack battery frame grid model is simplified and the model construction is completed after simplification.

[0068] In the above embodiment, the simplification of the mesh model of the backpack battery frame includes: mass point simplification, bolt simplification and contact simplification;

[0069] The mass point simplification refers to converting the model into a mass point; the mass point is located at the point where the center of gravity of the battery is the same as the weight;

[0070] The bolt simplification refers to changing the common bolt preload connection form into a rigid body connection;

[0071] The contact simplification refers to adding a contact connection rather than a rigid connection between two planes with contact force.

[0072] Specifically, the mass point is simplified: for example, the battery model can be equivalent to a mass point, that is, a point at the center of gravity of the battery with the same weight;

[0073] Bolt simplification: such as changing the common bolt preload connection form to a rigid connection;

[0074] Contact simplification: Add contact connection instead of rigid connection to two planes with contact force.

[0075] The above are all simplified methods, and the actual model needs to be selected according to the actual situation.

[0076] After simplification, the model is built in combination with the above embodiment, and subsequent calculations can be performed.

[0077] In the above embodiment, the boundary conditions defined in step S102 are formulated based on the actual stress conditions of the backpack battery frame, which include a stress position and a displacement position; the displacement position is the position where the battery frame is tied to the frame; the stress position is the position where the battery is installed on the battery frame and the connection point between the battery and the frame.

[0078] Among them, the stress position and the displacement position are determined according to the actual stress conditions of the back battery frame. For example, if the battery frame is tied to the frame, the displacement position here is bound to the frame; the battery is installed on the battery frame, and the connection point between the battery and the frame is the stress position.

[0079] In step S103 of the above embodiment, the backpack battery frame grid model is combined with the whole vehicle model, and the load spectrum is imported for iterative calculation, including: based on the whole vehicle model, the load spectrum is imported to simulate the vehicle operation condition, and the back battery frame is imported into the whole vehicle model for iterative calculation, and the calculated stress results are exported.

[0080] In the above embodiment, step S105, by comparing the calculation result with the actual operation situation, judging whether the calculation is accurate, until the calculation result is consistent with the actual situation, includes:

[0081] If the calculated stress result is inconsistent with the stress position measured by the actual load spectrum, determine whether the inconsistent deviation data exceeds the preset threshold; if the deviation data exceeds the preset threshold, adjust the two-dimensional and three-dimensional mesh quality, rigid unit, solid unit properties, and connection method to make the calculation result converge to the actual load spectrum. Until the calculation result is consistent with the actual situation; if it is consistent, the deviation is within 10%.

[0082] The method provided in the above embodiment also includes: test data can be obtained according to the operating data of the test vehicle under different working conditions, and the test data includes acceleration load data and displacement load data.

[0083] For example, an acceleration sensor may be installed on the backpack battery frame of the test vehicle to test the acceleration load data under different working conditions, and a displacement sensor may be installed on the backpack battery frame to test the displacement load data under different working conditions.

[0084] The backpack battery frame mesh model established by the processing software Hypermesh is imported into the ABAQUS software, and then the test data is applied to the backpack battery frame mesh model to simulate the actual vehicle working conditions. The stress data of the backpack battery frame mesh model after the test data is applied is obtained.

[0085] Optionally, test data is applied to the backpack battery frame mesh model. In the process of simulating the actual vehicle working conditions, the strength of the backpack battery frame mesh model after the test data is applied can be calculated based on the finite element analysis software ABAQUS. The finite element analysis method is to concentrate the mass of the mesh unit in the finite element model on the corresponding node, and the connection and force transmission between the mesh units are carried out through the node.

[0086] For the method steps disclosed in the above embodiments, the method steps are described as a series of action combinations for the purpose of simple description, but those skilled in the art should know that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0087] Based on the same inventive concept, the embodiment of the present application also provides a backpack battery frame optimization system based on a vehicle chassis for implementing the above-mentioned backpack battery frame optimization method based on a vehicle chassis. The implementation solution for solving the problem provided by the system is similar to the implementation solution recorded in the above-mentioned method. Therefore, the specific limitations in one or more embodiments of the backpack battery frame optimization system based on a vehicle chassis provided below can be found in the above limitations on the above-mentioned backpack battery frame optimization method based on a vehicle chassis, and will not be repeated here. It can be understood that the above description of its method is also applicable to the description of the system.

[0088] In one embodiment, a backpack battery frame optimization system based on a vehicle chassis is also provided. The embodiments of the present invention are described below in conjunction with the accompanying drawings. Figure 4 As shown, the system specifically includes:

[0089] A construction module 210 is used to construct a backpack battery frame grid model;

[0090] The first calculation module 220 is used to calculate the stress of the battery at different load position offsets by obtaining part structure and material parameters using mechanical calculation software, and to fit the force and load position offset to establish a load spectrum;

[0091] The loading module 230 is used to define the boundary conditions of the backpack battery frame grid model and load the model by assigning displacement, stress and acceleration;

[0092] The second calculation module 240 is used to combine the backpack battery frame grid model with the vehicle model and import it into the load spectrum for iterative calculation;

[0093] The adjustment module 250 is used to determine whether the calculation is accurate by comparing the calculation result with the actual operation situation, until the calculation result is consistent with the actual situation.

[0094] Optionally, the construction module 210 includes:

[0095] A construction unit is used to perform mesh modeling on the backpack battery frame structure. According to the part features of the backpack battery frame, the backpack battery frame structure is divided into two-dimensional meshes and three-dimensional meshes, the weld part is processed by weld modeling, different mesh models are generated, and entity attributes of different mesh models are selected for assignment;

[0096] Wherein, the backpack battery frame comprises a backpack frame, a battery and a vehicle frame;

[0097] The entity attributes of the grid model include rigid body unit, entity unit, plate unit and mass unit attributes;

[0098] The simplified unit is used to simplify the backpack battery frame grid model and complete the model construction after simplification.

[0099] It is worth noting that although only some basic functional modules are disclosed in the embodiments of the present invention, it does not mean that the composition of the present system is limited to the above basic functional modules. On the contrary, what the present embodiment wants to express is that on the basis of the above basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the prior art to form an infinite number of embodiments or technical solutions. In other words, the present system is open rather than closed. Just because the present embodiment only discloses individual basic functional modules, it cannot be considered that the protection scope of the claims of the present invention is limited to the disclosed basic functional modules. At the same time, for the convenience of description, the above devices are described in terms of functions and are described separately in various units and modules. Of course, when implementing the present invention, the functions of each unit and module can be implemented in the same or one or more software and / or hardware.

[0100] like Figure 5 As shown, the present invention also provides an electronic device, comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of a backpack battery frame optimization method based on a vehicle chassis.

[0101] Figure 5 Schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Figure 5 The electronic device provided in the embodiment of the present invention includes: one or more processors 310 and a storage device 320; the processor 310 in the electronic device may be one or more, Figure 3A processor 310 is taken as an example; the storage device 320 is used to store one or more programs; the one or more programs are executed by the one or more processors 310, so that the one or more processors 310 implement the method for optimizing a backpack battery frame based on a vehicle chassis as described in any of the embodiments of the present invention.

[0102] The electronic device may further include: an input device 330 and an output device 340 .

[0103] The processor 310, storage device 320, input device 330 and output device 340 in the electronic device can be connected via a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0104] The storage device 320 in the electronic device is a computer-readable storage medium that can be used to store one or more programs, which can be software programs, computer executable programs, and modules, such as the program instructions / modules corresponding to the backpack battery frame optimization method based on the vehicle chassis provided in the embodiment of the present invention. The processor 310 executes various functional applications and data processing of the electronic device by running the software programs, instructions, and modules stored in the storage device 320, that is, the method for optimizing the backpack battery frame based on the vehicle chassis in the above method embodiment is implemented.

[0105] The storage device 320 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the electronic device, etc. In addition, the storage device 320 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the storage device 320 may further include a memory remotely arranged relative to the processor 310, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0106] The input device 330 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 340 may include a display device such as a display screen.

[0107] The present invention also provides a computer-readable storage medium storing a computer program executable by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of a method for optimizing a backpack battery frame based on a vehicle chassis.

[0108] Specifically, the computer storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0109] The present invention also provides a vehicle, which is provided with a vehicle body, and a backpack battery frame optimization system based on a vehicle chassis as described above is arranged in the vehicle body.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A backpack battery frame optimization method based on a vehicle chassis, characterized in that: The method comprises: Construct a backpack battery frame grid model; By obtaining the structure and material parameters of the parts, the stress of the battery at different load position offsets is calculated using mechanical calculation software, and the force and load position offset are fitted to establish the load spectrum; Defining the boundary conditions of the backpack battery frame grid model, and loading the model by assigning displacement, stress and acceleration; Combine the backpack battery frame grid model with the vehicle model and import it into the load spectrum for iterative calculation; By comparing the calculation results with the actual operation situation, determine whether the calculation is accurate until the calculation results are consistent with the actual situation.

2. The method according to claim 1, characterized in that The method of constructing a backpack battery frame grid model includes: grid modeling the backpack battery frame structure; dividing the backpack battery frame structure into two-dimensional grids and three-dimensional grids according to the part features of the backpack battery frame, processing the welding part by weld modeling, generating different grid models, and selecting entity attributes of different grid models for assignment; Wherein, the backpack battery frame comprises a backpack frame, a battery and a vehicle frame; The entity attributes of the grid model include rigid body unit, entity unit, plate unit and mass unit attributes; The backpack battery frame grid model is simplified and the model construction is completed after simplification.

3. The method according to claim 2, characterized in that The simplification of the backpack battery frame mesh model includes: mass point simplification, bolt simplification and contact simplification; The mass point simplification refers to converting the model into a mass point; the mass point is located at the point where the center of gravity of the battery is the same as the weight; The bolt simplification refers to changing the common bolt preload connection form into a rigid body connection; The contact simplification refers to adding a contact connection rather than a rigid connection between two planes with contact force.

4. The method according to claim 1, characterized in that: The boundary conditions are formulated based on the actual stress conditions of the backpack battery frame, which include stress positions and displacement positions; the displacement position is the position where the battery frame is tied to the frame; the stress position is the position of the connection point between the battery and the frame where the battery is installed on the battery frame.

5. The method according to claim 1, characterized in that The method of combining the backpack battery frame grid model with the whole vehicle model and importing the load spectrum for iterative calculation includes: based on the whole vehicle model, importing the load spectrum to simulate the vehicle operation, and importing the back battery frame into the whole vehicle model for iterative calculation, and exporting the calculated stress results.

6. The method according to claim 1, characterized in that The step of comparing the calculation result with the actual operation situation to determine whether the calculation is accurate until the calculation result is consistent with the actual situation includes: If the calculated stress result is inconsistent with the stress position measured by the actual load spectrum, it is determined whether the inconsistent deviation data amount exceeds the preset threshold; when the deviation data amount exceeds the preset threshold, adjustments are made to the two-dimensional and three-dimensional mesh quality, rigid unit, solid unit properties, and connection methods to make the calculation results converge to the actual load spectrum.

7. A backpack battery frame optimization system based on a vehicle chassis, characterized in that: The system comprises: A construction module for building a piggyback battery frame grid model; The first calculation module is used to obtain the part structure and material parameters, calculate the stress of the battery at different load position offsets using mechanical calculation software, and fit the force and load position offset to establish a load spectrum; A loading module, used to define the boundary conditions of the backpack battery frame grid model, and load the model by assigning displacement, stress and acceleration; The second calculation module is used to combine the backpack battery frame grid model with the vehicle model and import it into the load spectrum for iterative calculation; The adjustment module is used to determine whether the calculation is accurate by comparing the calculation results with the actual operation conditions, until the calculation results are consistent with the actual conditions.

8. The system according to claim 7, characterized in that The building blocks include: A construction unit is used to perform mesh modeling on the backpack battery frame structure. According to the part features of the backpack battery frame, the backpack battery frame structure is divided into two-dimensional meshes and three-dimensional meshes, the weld part is processed by weld modeling, different mesh models are generated, and entity attributes of different mesh models are selected for assignment; Wherein, the backpack battery frame comprises a backpack frame, a battery and a vehicle frame; The entity attributes of the grid model include rigid body unit, entity unit, plate unit and mass unit attributes; The simplified unit is used to simplify the backpack battery frame grid model and complete the model construction after simplification.

9. An electronic device, comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the method steps as claimed in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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