On-line measurement method and system for dynamic impedance of battery

A dynamic impedance and measurement method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inability to accurately obtain the online dynamic impedance of the battery, affect the battery impedance, change the battery state, etc., and achieve real-time online measurement , the effect of reducing the measurement time

Pending Publication Date: 2020-08-25
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] At present, electrochemical impedance spectroscopy is a quasi-steady-state method. When measuring battery impedance spectroscopy, the battery needs to be left still to ensure that the battery is in a steady state for measurement. Therefore, the traditional EIS method is only carried out in the laboratory. Off-line measurement; however, in practical applications, the battery is in a running state, and the charging and discharging current will change the state of the battery, which will also affect the impedance of the battery. Therefore, the existing impedance spectroscopy measurement method is limited and cannot accurately obtain the battery. Online Dynamic Impedance

Method used

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  • On-line measurement method and system for dynamic impedance of battery
  • On-line measurement method and system for dynamic impedance of battery
  • On-line measurement method and system for dynamic impedance of battery

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Embodiment 1

[0036] A kind of online measurement method of battery dynamic impedance, see Figure 1 to Figure 6 , including the following steps,

[0037] In the first step, a multi-tone excitation signal is synthesized by using sinusoidal signals of multiple frequencies and phases;

[0038]The second step is to measure the impedance spectrum in the time domain through FFT, and use the multi-tone excitation signal as the input to measure the battery impedance at multiple frequency points at the same time;

[0039] The third step is to measure the battery impedance during the operation process. During the measurement, connect the signal amplification power supply device at both ends of the battery, amplify the excitation signal and superimpose it on both ends of the battery, because the battery charge and discharge is a DC signal, and the excitation signal is an AC signal. During the measurement, the DC signal of the battery is filtered out as a bias signal, and only the AC component of the...

Embodiment 2

[0043] The online measurement method for battery dynamic impedance described in Embodiment 1 may more specifically include the following steps,

[0044] In the first step, multiple frequency and phase sinusoidal signals are used to synthesize a multi-tone excitation signal, and the multi-tone excitation signal is generated by superposition of multiple sinusoidal signals, such as figure 1 As shown, a single sinusoidal signal is generated by a digital direct frequency synthesizer (DDS), and the DDS generates a sinusoidal frequency and phase controllable in the form of a numerically controlled oscillator. The circuit includes a system clock, a frequency controller, and a phase control It is composed of device, sine table, signal storage, adder and digital / analog converter; the frequency controller and phase controller respectively control the frequency and phase of the sine wave output by DDS, and the sine table stores a complete cycle of sine wave Digital amplitude information, ...

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Abstract

The invention discloses an on-line measurement method for dynamic impedance of a battery. The method comprises the following steps: a multi-tone excitation signal is synthesized by using sinusoidal signals of multiple frequencies and phases; through FFT impedance spectrum time domain measurement, a multi-tone excitation signal is used as input, and battery impedance under multiple frequency pointsis measured at the same time; battery impedance measurement is carried out in the operation process; during measurement, signal amplification power supply devices are connected to the two ends of a battery, and excitation signals are amplified and then superposed at the two ends of the battery; during measurement, direct-current signals of the battery serve as bias signals to be filtered out, only alternating-current components of voltage/current need to be tested, FFT conversion is conducted according to the measured alternating-current components, and the dynamic impedance of the battery isobtained through calculation; dynamic impedance measurement is carried out through parallel connection and series connection of a plurality of batteries; impedance of a plurality of frequency pointscan be measured at one time, the measurement time of battery impedance is greatly reduced, the impedance of the battery under the action of charging and discharging current can be better reflected, and real-time online measurement of the battery impedance can be realized.

Description

technical field [0001] The invention belongs to the field of battery technology, in particular to an online measurement method and system for battery dynamic impedance. Background technique [0002] Lithium battery is a closed nonlinear electrochemical system. During the charge and discharge process, various forms of energy such as electric energy, chemical energy, and heat energy will be converted. In fact, it is difficult to express the internal characteristics of the battery through external characteristics, which makes it difficult to Accurate evaluation of battery status and performance is achieved, resulting in poor initial battery sorting results and poor implementation of the equalization strategy of the battery management system in the later stage. In order to better grasp the dynamic consistency of the lithium-ion battery pack, it is hoped that a means can be used to quantify the dynamic consistency of the battery through certain parameters, so as to help analyze a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389G01R31/396G01R31/367
CPCG01R31/389G01R31/396G01R31/367
Inventor 侯朝勇陈娟渠展展汪奂伶杨水丽惠东
Owner CHINA ELECTRIC POWER RES INST
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