Battery pack fatigue test method
A fatigue test and battery pack technology, applied in the automotive field, can solve the problems of low calculation accuracy of battery pack fatigue life and long calculation cycle, and achieve the effect of improving fatigue test accuracy, short test period and high test efficiency
Pending Publication Date: 2021-04-27
JIANGLING MOTORS
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Problems solved by technology
[0004] In view of the above situation, it is necessary to provide a battery pack fatigue test method for the problems of low calculation accuracy and long calculation period of battery pack fatigue life in the prior art
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[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0035] These and other aspects of embodiments of the invention will become apparent with reference to the following description and drawings. In these descriptions and drawings, some specific implementations of the embodiments of the present invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the present invention, but it should be understood that the scope of the embodiments of the present invention is not limited by This restriction. On the contrary, the embodiments of the p...
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The invention discloses a battery pack fatigue test method, which comprises the following steps of: establishing a finite element model of a battery pack, and respectively loading vibration accelerations in X, Y and Z directions by taking a mounting point of the battery pack as an excitation source; carrying out modal frequency response analysis on the finite element model to obtain a frequency-stress function of each direction axis under unit stress; respectively acquiring vibration acceleration excitation signals of each mounting point of the battery pack on each direction axis under a plurality of actual road conditions; respectively performing power spectral density function conversion on the vibration acceleration excitation signal on each direction axis to obtain a power spectral density function of the corresponding direction axis; obtaining a material fatigue characteristic curve of the battery pack, and calculating a fatigue damage value of the battery pack according to the material fatigue characteristic curve and the frequency stress function and the power spectral density function of each direction axis; judging whether the fatigue damage value is lower than a threshold value; and if yes, determining that the fatigue performance test of the battery pack is qualified. The test method is high in accuracy and short in testing period.
Description
technical field [0001] The invention relates to the field of automobiles, in particular to a battery pack fatigue testing method. Background technique [0002] With the increasingly severe environmental pollution and energy shortages, the status of traditional fuel vehicles is gradually being replaced by new energy vehicles, especially new energy vehicles. As the main energy component of new energy vehicles, the power battery provides energy for the vehicle to run, and the battery pack is a component that accommodates and supports the power battery, so its performance will directly affect the reliability and safety of the vehicle. During the driving process of the car, the battery pack is constantly excited by the random road surface transmitted from the body, and long-term random vibration may lead to structural fatigue damage. [0003] At present, the fatigue life calculation of battery packs is mostly based on the time domain method, that is, using strain gauges to obtai...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G06F30/23G01M7/02G06F119/02G06F119/04G06F119/14
CPCG06F30/23G01M7/025G06F2119/02G06F2119/04G06F2119/14
Inventor 贾慧芳段龙杨黄晖邱星邱祖峰黄玮
Owner JIANGLING MOTORS