Method for on-line measurement of battery internal resistance, current operational module, and on-line measurement instrument for battery internal resistance
First Claim
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1. An on-line measurement method for battery internal resistance, comprising:
- two operational modules connected in parallel with a positive end and a negative end of a battery to be measured,wherein one module of the two operational modules is a current operational module configured to generate an excitation current signal and measure a corresponding excitation current passing through the battery under measurement, and the other module of the two operational modules is a voltage measurement module configured to generate an excitation voltage signal and measure a corresponding excitation voltage between two ends of the battery under measurement,wherein the current operational module includes a load circuit configured to discharge a pulse Direct Current (DC) signal to generate the excitation current signal, the pulse DC signal having one DC component and one sine Alternating Current (AC) component,wherein work power of the load circuit is supplied by an auxiliary power supply connected in series with the load circuit, one end of the load circuit being connected with a positive end of the auxiliary power supply, and a positive end of the battery under measurement being connected with a negative end of the auxiliary power supply,wherein the load circuit is controlled by a signal generation module so that a frequency of the sine AC component is 10 Hz-25 Hz, andwherein the voltage measurement module includesa stopping capacitor configured to remove DC component in the voltage signal,an operational amplifier configured to amplify the voltage signal,a high efficient digital filter configured to filter the amplified voltage signal, anda resistance-capacitance coupled circuit configured to eliminate an effect of an output offset voltage from the filtered voltage signal and output the excitation voltage signal,wherein the excitation current signal output from the current operational module and the excitation voltage signal output from the voltage measurement module are converted to respective digital signals by an analog-to-digital converter which are sent to a central processing module, andwherein the central processing module is configured to calculate an internal resistance of the battery under measurement according to measured values of the excitation current signal and the excitation voltage signal.
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Abstract
A method and a current operational module for on-line measurement of battery internal resistance and an on-line measurement instrument for battery internal resistance have high measurement accuracy and strong anti-interference ability. The on-line measurement instrument for battery internal resistance comprises a current work module, a voltage measurement module, an analog to digital conversion module, a signal generation module, a center processing module, an Input/Output module, and a power supply module used for on-line measurement of battery internal resistance.
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Citations
12 Claims
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1. An on-line measurement method for battery internal resistance, comprising:
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two operational modules connected in parallel with a positive end and a negative end of a battery to be measured, wherein one module of the two operational modules is a current operational module configured to generate an excitation current signal and measure a corresponding excitation current passing through the battery under measurement, and the other module of the two operational modules is a voltage measurement module configured to generate an excitation voltage signal and measure a corresponding excitation voltage between two ends of the battery under measurement, wherein the current operational module includes a load circuit configured to discharge a pulse Direct Current (DC) signal to generate the excitation current signal, the pulse DC signal having one DC component and one sine Alternating Current (AC) component, wherein work power of the load circuit is supplied by an auxiliary power supply connected in series with the load circuit, one end of the load circuit being connected with a positive end of the auxiliary power supply, and a positive end of the battery under measurement being connected with a negative end of the auxiliary power supply, wherein the load circuit is controlled by a signal generation module so that a frequency of the sine AC component is 10 Hz-25 Hz, and wherein the voltage measurement module includes a stopping capacitor configured to remove DC component in the voltage signal, an operational amplifier configured to amplify the voltage signal, a high efficient digital filter configured to filter the amplified voltage signal, and a resistance-capacitance coupled circuit configured to eliminate an effect of an output offset voltage from the filtered voltage signal and output the excitation voltage signal, wherein the excitation current signal output from the current operational module and the excitation voltage signal output from the voltage measurement module are converted to respective digital signals by an analog-to-digital converter which are sent to a central processing module, and wherein the central processing module is configured to calculate an internal resistance of the battery under measurement according to measured values of the excitation current signal and the excitation voltage signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A current operational module for on-line measurement of battery internal resistance, comprising:
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a load circuit configured to discharge a pulse DC signal to a battery under measurement; an auxiliary power supply connected in series with the load circuit; and a stopping circuit, wherein the pulse DC signal has one DC component and one sine AC component, wherein a frequency of the sine AC component is 10 Hz-25 Hz wherein an output of the load circuit is connected with an input of the stopping circuit, and wherein one end of the load circuit is connected with a positive end of the auxiliary power supply, and a positive end of the battery under measurement is connected with a negative end of the auxiliary power supply.
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8. An on-line measurement instrument for battery internal resistance, comprising:
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a current operational module, a voltage measurement module, an analog to digital conversion module, a signal generation module, a central processing module, an Input/Output module, and a power supply module, wherein the current operational module comprises an auxiliary power supply, the current operational module and the voltage measurement module are connected in parallel to a positive end and a negative end of a battery under measurement, an output of the current operational module and an output of the voltage measurement module are connected with an analog to digital conversion input of the analog to digital conversion module, an Input/Output of the central processing module are connected with the analog to digital conversion module, the signal generation module and the Input/Output module, an output of the signal generation module is connected with an input of a load circuit of the current operational module, one end of the load circuit is connected with a positive end of the auxiliary power supply, and the positive end of the battery under measurement is connected with a negative end of the auxiliary power supply, an output of the power supply module is connected with a power supply end of the current operational module, the voltage measurement module, the analog to digital conversion module, the signal generation module, the central processing module and the Input/Output module, the signal generation module is configured to generate a pulse DC signal to control a discharge of the load circuit, the pulse DC signal has one DC component and one sine Alternating Current (AC) component, a frequency of the sine AC component is 10 Hz-25 Hz, and the voltage measurement module includes a stopping capacitor configured to remove a DC component in the voltage signal, an operational amplifier configured to amplify the voltage signal, a high efficient digital filter configured to filter the amplified voltage signal, and a resistance-capacitance coupled circuit configured to eliminate an effect of an output offset voltage from the filtered voltage signal and output a voltage measurement signal. - View Dependent Claims (9, 10, 11, 12)
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Specification