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Power battery pack fatigue life calculation method

A power battery pack, fatigue life technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of actual working condition deviation, excluding torsional strength, etc., to reduce simulation errors, improve performance, and improve Effects on Modeling Efficiency

Pending Publication Date: 2021-02-05
NANJING NAVECO AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, these standards only consider the vibrations in the X, Y, and Z directions, and do not consider complex vibrations, which often deviate from the actual working conditions.
In addition, when the vehicle is driving on an uneven road, the vehicle has a certain torsion angle and drives the power battery pack to torsion, and the analysis of torsional strength is not included in the conventional analysis

Method used

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  • Power battery pack fatigue life calculation method
  • Power battery pack fatigue life calculation method
  • Power battery pack fatigue life calculation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: as figure 1 As shown, a method for calculating the fatigue life of a power battery pack includes the following steps:

[0060] a. Acceleration load collection: Arrange three three-way acceleration sensors on the beam near the power battery pack. The acceleration sensor model is: PCB 356A26, and collect the acceleration load spectrum of the power battery pack on the typical road surface of the test site;

[0061] b. Acceleration load processing: check the data rationality of the measured acceleration load spectrum, select relevant channels for filtering, and eliminate low frequency and high frequency parts that have little effect on fatigue strength;

[0062] c. Establish a vibration fatigue finite element model: establish a finite element model of the frame truncated belt power battery pack, use shell elements to simulate the solder joints and welds in the key areas of the power battery pack, and perform constrained modal analysis to judge whether the mode...

example 1

[0093] Example 1: The node number 403826 on the welding seam of the power battery pack has a loss value of 1.6e for one cycle on the No. 1 Belgian road -5 , the loss value of one cycle on No. 2 shortwave road is 2.2e -6 , then the total damage value of node number 403826 is:

[0094] D. v =C 1 D. 1 +C 2 D. 2 ;

[0095] D. v : The total damage value on each unit of the power battery pack;

[0096] C 1 : Number of cycles on Belgian pavement No. 1, C 1 =20440;

[0097] C 2 : Number of cycles on No. 2 shortwave road, C 2 =4088;

[0098] D. v =20440×1.6e -5 +4088×2.2e -6 =0.33>0.2 does not meet the requirements.

example 2

[0099] Example 2: The loss value of the node number 1905295 on the welding seam of the power battery pack for one cycle on the No. 1 Belgian road is 2.81e -6 , the loss value of one cycle on No. 2 shortwave road is 1.05e -6 , then the total damage value of node number 1905295 is:

[0100] D. v =C 1 D. 1 +C 2 D. 2 ;

[0101] D. v : The total damage value on each unit of the power battery pack;

[0102] C 1 : Number of cycles on Belgian pavement No. 1, C 1 =20440;

[0103] C 2 : Number of cycles on No. 2 shortwave road, C 2 =4088;

[0104] D. v =20440×2.81e -6 +4088×1.05e -6 =0.062<0.2, meeting the requirements.

[0105] The limit torsion angle of the vehicle in step f is measured under quasi-static conditions. The working condition is that the left front wheel is raised by 150 mm, and the right rear wheel is raised by 150 mm. The measured torsion angle of the front and rear axles of the frame is θ=0.8°.

[0106] like Figure 9 As shown, the finite element mod...

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Abstract

The invention discloses a power battery pack fatigue life calculation method, which comprises two working conditions of multi-axis vibration fatigue analysis and torsional fatigue, load inputs of thetwo working conditions are from test actual measurement data, and meanwhile, influences of welding spots and welding seams of a key area of a power battery pack on fatigue life are considered. According to the method for calculating the fatigue life of the power battery pack provided by the invention, the stress condition of the power battery pack with a flexible connection structure is also considered in vibration fatigue analysis, and the stress load of the power battery pack on various road surfaces is accurately and comprehensively considered; according to the method, the performance of the power battery pack structure can be rapidly and effectively evaluated, and engineering technicians are helped to carry out risk prediction on the power battery pack, so that the power battery pack is optimized in a targeted manner, and the performance of the power battery pack is improved.

Description

Technical field: [0001] The invention relates to the technical field of new energy vehicles, in particular to a method for calculating the fatigue life of a power battery pack. Background technique: [0002] The power battery pack is the core component of new energy vehicles. It is the "heart" of new energy vehicles. Its performance not only affects the driving comfort and reliability of vehicles, but also affects the safety of new energy vehicles. The structural mechanical properties of power battery packs are the basis for reliability and safety. Predicting the fatigue life of the power battery pack and optimizing the battery pack through simulation analysis technology is an important part of the structural design of the battery pack. Through simulation analysis technology, the structural mechanical properties of the power battery pack can be improved to improve the performance and quality of the power battery pack. The structural mechanics analysis of conventional batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F119/04
CPCG06F30/23G06F2119/04
Inventor 袁刘凯张汤赟黄玉杨佼源孙文政陆小川
Owner NANJING NAVECO AUTOMOBILE CO LTD
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