Measuring circuit and method for measuring AC impedance of a battery

An AC impedance and measurement circuit technology, applied in the measurement of electrical variables, measurement of resistance/reactance/impedance, measurement devices, etc., can solve the problems of complex algorithms, bulky equipment, and inapplicability to on-board impedance measurement, to simplify calculation, improve Accurate, practical effects

Active Publication Date: 2019-10-15
TONGJI UNIV
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Problems solved by technology

[0003] At present, the AC impedance measurement of power batteries is mostly based on electrochemical workstations. The impedance information of the battery can be obtained very accurately by using the AC impedance method (EIS), but the algorithm is complicated and the equipment is bulky, which is not suitable for vehicle impedance measurement.

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  • Measuring circuit and method for measuring AC impedance of a battery
  • Measuring circuit and method for measuring AC impedance of a battery
  • Measuring circuit and method for measuring AC impedance of a battery

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0051] The invention proposes a measurement circuit for the AC impedance of a battery cell, figure 1 Shown is the schematic diagram of this measuring circuit in the present embodiment, figure 2 for a more detailed schematic diagram.

[0052]The measurement circuit includes a sampling resistor connected in series with the battery B1, a battery current signal conditioning module MOD1 whose input terminal is connected to both ends of the sampling resistor (to measure the excitation current applied to the battery B1 and regulate the measured excitation current, the conditioning Including amplifying and filtering the excitation current; in the present embodiment, the excitation current is a sinusoidal current containing a single frequency component), the battery response voltage signal conditioning module MOD2 connected to the two ends of the batt...

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Abstract

The invention proposes a battery AC impedance measurement circuit and method, and belongs to the technical field of battery measurement. The circuit comprises a battery current signal conditioning module which is used for obtaining an excitation current loaded on a battery and amplifying and filtering the current; a battery response voltage signal conditioning module which is connected with the battery and is used for measuring and amplifying and filtering a response voltage of the battery to the excitation current; and a signal processing and control module which is connected with the battery current signal conditioning module and the battery response voltage signal conditioning module and is used for carrying out the orthogonal calculation of an orthogonal value of the excitation current, enabling the excitation current, the orthogonal value and the response voltage to be mutually correlated, obtaining a mutual correlation result, calculating the modulus of impedance and an impedance angle based on the mutual correlation result, and obtaining the AC impedance of the battery. The circuit can measure the AC impedance of the battery in a simple mode, and is especially suitable for the measurement of the AC impedance of a power cell.

Description

technical field [0001] The invention belongs to the technical field of battery measurement, and relates to an impedance measurement technology, in particular to an AC impedance measurement technology. Background technique [0002] New energy electric vehicles are considered to be an effective way to solve energy and environmental problems, and have received strong support and promotion from various countries. In new energy vehicles, the power battery needs to provide a strong driving force, and also provide power to the power steering system, signal system, ignition system, etc. In order to better understand the state of battery usage, it is necessary to acquire and analyze various states of the battery (lifetime, internal temperature, state of charge, etc.). Early battery state estimation was mainly aimed at the state of charge of the battery, which was realized with the help of various algorithms through the detection of voltage, current, and temperature. As a frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/14
Inventor 魏学哲戴海峰蒋晶王学远
Owner TONGJI UNIV
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