Device, system, and method for measuring internal impedance of a test battery using frequency response

An impedance measurement system, comprising:

• a test battery;
• and
• an impedance measurement device operably coupled to the test battery, wherein the impedance measurement device includes:
• a preamplifier including a current driver and a signal measuring module operably coupled with the test battery;
• a current control signal generator operably coupled with the preamplifier;
• a data acquisition system operably coupled with the preamplifier;
• and
• a processor operably coupled with the current control signal generator and the data acquisition system, wherein the processor is configured to:
• control the current control signal generator to transmit a current control signal to the preamplifier during an auto-ranging mode to cause the current driver to generate an excitation current signal exhibiting a range of amplitudes;
• control the data acquisition system to analyze the response of the test battery from the signal measuring module during the auto-ranging mode;
• control the current control signal generator to transmit the current control signal to the preamplifier during a measuring to cause the current driver to generate the excitation current signal exhibiting a selected amplitude based, at least in part, on analyzing the response of the test battery during the auto-ranging mode;
• and
• control the data acquisition system to analyze the response of the test battery from the signal measuring module during the measuring mode to determine an impedance of the test battery.

A method of measuring impedance of a test battery, the method comprising:

• applying an excitation current signal to a test battery including a plurality of pulses exhibiting different amplitudes during an auto-ranging mode;
• measuring an electrical signal from the test battery responsive to the excitation current signal over the plurality of different amplitudes;
• applying the excitation current signal to the test battery exhibiting a fixed amplitude during a measuring mode, wherein the fixed amplitude is set based, at least in part, on an analysis of the electrical signal measured during the auto-ranging mode;
• and
• measuring the electrical signal from the test battery responsive to the excitation current signal exhibiting the fixed amplitude during the measuring mode to determine an internal impedance of the test battery.