Power battery heating noise optimization method and device

A power battery and optimization method technology, which is applied in the direction of power devices, electric power devices, battery/fuel cell control devices, etc., can solve the problems of poor temperature rise uniformity, complex structure of external heating method, etc., and achieve the effect of noise optimization

Active Publication Date: 2021-08-03
深蓝汽车科技有限公司
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  • Application Information

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Problems solved by technology

However, the external heating method has the disadvantages of complex structure and poor uniformity of temperature rise.

Method used

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  • Power battery heating noise optimization method and device
  • Power battery heating noise optimization method and device
  • Power battery heating noise optimization method and device

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Embodiment Construction

[0047] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0048] Such as Picture 1-1 and Figure 1-2, the inventor conducted spectrum analysis on the battery heating noise through experiments, and found that the noise spectrum is characterized by constant frequency and its multiplied frequency. At the same time, the noise spectrum and the AC current spectrum echo each other. The frequency doubling characteristics and the frequency spectrum characteristics of the AC current are closely related to the ...

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Abstract

The invention relates to a power battery heating noise optimization method and device so as to reduce the sound pressure level and sharpness of noise in the battery heating process and improve the sound quality of the battery heating noise. The method comprises the following steps: selecting a basic fixed-frequency switching frequency for enabling an IGBT to output pulse current; selecting a frequency bandwidth enabling the amplitude of the pulse current output by the IGBT to be optimal; generating a random variable-frequency switching frequency based on the basic fixed-frequency switching frequency and the frequency bandwidth; outputting the random frequency conversion switching frequency to an IGBT, so the IGBT outputs pulse current according to the random frequency conversion switching frequency, pulse heating is carried out on the power battery, the heating rate of the power battery is the highest, and the noise sound pressure level and noise sharpness generated in the heating process of the power battery both meet preset noise optimization requirements; wherein the frequency value of the random variable-frequency switching frequency is within a frequency range formed by the basic fixed-frequency switching frequency and the target fixed-frequency switching frequency.

Description

technical field [0001] The invention belongs to the field of NVH noise control optimization, and in particular relates to a power battery heating noise optimization method and device. Background technique [0002] The new energy vehicle battery is mainly a lithium battery, and the lithium battery electrolyte moves slowly in a low temperature environment, which affects the transfer activity of lithium ions between the positive and negative electrodes, resulting in a decline in the charge and discharge performance of the lithium battery. Among them, the charge and discharge performance of lithium iron phosphate battery at low temperature is the worst. The working temperature of lithium iron phosphate battery is generally required to be above -20°C, and the charge and discharge performance of lithium iron phosphate battery is severely limited below -20°C. Therefore, in a low temperature environment below -20°C, in order to maintain the charge and discharge performance of the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/42B60K1/00B60L58/27
CPCH01M10/615H01M10/625H01M10/42B60K1/00B60L58/27B60K2001/008Y02T10/70Y02E60/10
Inventor 郑伟邓清鹏喻成邓承浩周立群丁艳平牟小龙周安健
Owner 深蓝汽车科技有限公司
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