Method and system for testing battery impedance spectroscopy

A battery impedance and testing system technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring devices, etc., can solve the problems of monotonically changing excitation current, long test time, low efficiency, etc., and achieve the effect of improving measurement efficiency

Inactive Publication Date: 2007-05-23
BEIHUA UNIV +1
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Problems solved by technology

Since the impedance of the battery is a function of frequency, its impedance is different at different frequencies. Therefore, to measure the impedance spectrum of the battery, it is necessary to continuously change the frequency of the excitation current monotonously and repeat the above measurement process. The test time is long and the efficiency is high. Low

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  • Method and system for testing battery impedance spectroscopy
  • Method and system for testing battery impedance spectroscopy
  • Method and system for testing battery impedance spectroscopy

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Embodiment Construction

[0032] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention, and those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present utility model, Therefore, all equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by each claim.

[0033] 1. Basic principle of measurement

[0034] The battery can actually be equivalent to an active network, when a current of a certain frequency is applied to the battery to stimulate I(t)=I 0 Sin(ω t ), then there will be a corresponding response U(t)=U at the terminal voltage of the battery 0 Sin(ω t +ψ). By changing the frequency ω of the current excitation I(t), and measuring the corresponding terminal voltage response U(t), the internal impedance Z(ω) of ...

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Abstract

The invention relates to the battery impedance spectroscopy testing technology. The invention provides a battery impedance spectroscopy testing method, which imposes the current incentive I(t) on the battery, and through synchronous measurement of current incentive I(t) and terminal voltage response U(t), calculates the amplitude spectrum I(Omegak), U(Omegak) and phase spectrum phiI(Omegak), phiU(Omegak) of current incentive I(t) and terminal voltage response U(t) under a variety of frequencies, and according to the spectrum of I and U, calculates the battery inner impedance Z0(Omegak)=U(Omegak) / I(Omegak) under a variety of frequencies, resulting in the complete spectra of battery inner impedance. The invention also provides a battery impedance spectroscopy testing system, including the control and data processing module, the high-speed synchronous sampling and measurement module, the voltage and current signal isolation and modulating module, the discharge control module, the controllable discharge module. Using the method and system in this invention, it can quickly complete the battery impedance spectrum measurement and analysis in a short time, greatly increasing the measurement efficiency.

Description

technical field [0001] The invention relates to battery impedance spectrum testing technology, in particular to a battery impedance spectrum testing technology based on current pulse excitation and spectrum analysis technology. Background technique [0002] In recent years, the simple and rapid test method of battery state of charge (SOC) and battery state of health (SOH) using internal resistance / conductance testing technology has been widely recognized by western countries. This technology has been approved by the International Electrotechnical Commission ( IEEE) is listed as the test standard for valve-regulated lead-acid batteries (VRLA). [0003] The IEEE standard (1118-1996) states that the measurement of battery conductance is to apply an alternating voltage of known frequency and amplitude to both ends of the battery, and then measure the resulting current. The AC conductance value is the ratio of the AC current component in phase with the AC voltage to the AC volta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/14G01R31/36
Inventor 姜丰
Owner BEIHUA UNIV
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