Judging method of electromobile car battery discharging termination bused on small wave transformation

A technology of electric vehicle battery and wavelet transform, which is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, measuring electricity, etc., can solve problems such as rarely used and complicated process, and achieve overcoming influence and strong self-adaptation performance, the effect of overcoming measurement noise

Inactive Publication Date: 2004-12-22
TSINGHUA UNIV
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Problems solved by technology

In addition to continuously recording the historical data of battery charge and discharge, this method also needs to correct the capacity of discharge current, battery aging, self-discharge, etc. The process is complicated and is generally rarely used.

Method used

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  • Judging method of electromobile car battery discharging termination bused on small wave transformation
  • Judging method of electromobile car battery discharging termination bused on small wave transformation
  • Judging method of electromobile car battery discharging termination bused on small wave transformation

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Embodiment Construction

[0027] The specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0028] combine figure 1 For illustration, the load voltage signal V(t) of the battery cell is obtained from the data acquisition module of the battery management system. When using the fixed termination voltage method for pre-judgment, the threshold V 0 The selection can use the conclusion of the experiment (constant current discharge experiment) of the fixed termination voltage method to choose a conservative value of termination voltage as V 0 . For example, for Ni-MH battery threshold V 0 =1.1V, for lithium-ion battery threshold V 0 = 2.9V.

[0029] When V(t) is lower than the threshold V 0 After that, start the wavelet to analyze the load voltage V(t).

[0030] The continuous wavelet transform of a signal x(t) is defined as:

[0031] WTx ( a , t ) = ...

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Abstract

In the invention, using method of fixed final voltage and slope method of discharge curve synthetically carries out judgment of discharge off. Using method of fixed final voltage carried out prejudgment. When load voltage is lower then fixed final voltage, wavelet analysis module is started up. Using wavelet transform analyzes signal of load voltage on batteries to pick up catastrophe point of slope. When catastrophe point of slope occurs, discharge is stopped. The invention possesses strong adaptability. The method determines final state of discharge in self-adapting under different environment in use and different kinds of batteries. Moreover, the method overcomes influence of measuring noise.

Description

technical field [0001] A wavelet transform-based determination method for the discharge termination state of an electric vehicle battery relates to the technical field of electric vehicle intelligent information processing. Background technique [0002] With the growing awareness of environmental protection, more and more people in the automotive field are turning their attention to zero-emission electric vehicles. As the main or auxiliary power source of electric vehicles, batteries are a key component of electric vehicles. How to use batteries reasonably, make full use of the energy in the battery pack, and prolong the service life of batteries are the problems that must be solved in the further development of electric vehicles and hybrid vehicles. In order to make full use of the energy of the battery and prevent any battery in the battery pack from over-discharging, the judgment of the end-of-discharge state of the battery must be timely and accurate. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/44
CPCY02E60/12Y02E60/10
Inventor 王军平陈全世田光宇韩晓东
Owner TSINGHUA UNIV
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