Method for generating electrochemical impedance spectroscopy of battery, medium, and computer device

A non-transitory computer readable storage medium storing computer-executable instructions for, when executed by one or more processors, performing a method for generating an electrochemical impedance spectrum for a battery of a vehicle, the method comprising:

• when the batter is discharged to power other devices of the vehicle, collecting battery discharge information of the battery periodically and on board according to a preset collection interval, wherein the battery discharge information comprises collection time, and current information and voltage information, and wherein the collection time is every time point when the battery discharge information is collected, the current information is a corresponding current value of the battery at each collection time, and the voltage information is a corresponding voltage value of the battery at each collection time;
• performing Fourier transform according to the collection interval and the battery discharge information, to obtain multiple frequency-based first battery signals;
• determining a preset voltage threshold;
• determining a second battery signal from the multiple first battery signals, wherein the second battery signal comprises a voltage signal greater than or equal to the preset voltage threshold;
• determining an electrochemical impedance of a corresponding frequency according to the second battery signal, and constructing an electrochemical impedance spectrum according to all the electrochemical impedance without an off-line electrochemical workstation, and
• presenting the electrochemical impedance spectrum as an electrochemical impedance spectrum curve to reflect an overall state of the battery of the vehicle, wherein a start point of the electrochemical impedance spectrum curve is limited by a frequency of the collection time,
• wherein determining the preset voltage threshold comprises:
• setting an initial voltage threshold;
• increasing the initial voltage threshold by a preset increment, until the obtained electrochemical impedance spectrum curve is a smooth curve;
• and
• using the voltage threshold corresponding to the smooth curve as the preset voltage threshold.

A computer device for generating an electrochemical impedance spectrum for a battery of a vehicle, comprising:

• a memory storing computer-executable computer programs;
• and
• at least one processor configured to execute the computer program to perform:
• when the battery is discharged to power other devices of the vehicle, collecting battery discharge information of the battery periodically and on board according to a preset collection interval, wherein the battery discharge information comprises collection time, and current information and voltage information, and wherein the collection time is every time point when the battery discharge information is collected, the current information is a corresponding current value of the battery at each collection time, and the voltage information is a corresponding voltage value of the battery at each collection time;
• performing Fourier transform according to the collection interval and the battery discharge information, to obtain multiple frequency-based first battery signals;
• determining a preset voltage threshold;
• determining a second battery signal from the multiple first battery signals, wherein the second battery signal comprises a voltage signal greater than or equal to the preset voltage threshold;
• determining an electrochemical impedance of a corresponding frequency according to the second battery signal, and constructing an electrochemical impedance spectrum according to all the electrochemical impedance without an off-line electrochemical workstation, and
• presenting the electrochemical impedance spectrum as an electrochemical impedance spectrum curve to reflect an overall state of the batter of the vehicle, wherein a start point of the electrochemical impedance spectrum curve is limited by a frequency of the collection time,
• wherein determining the preset voltage threshold comprises:
• setting an initial voltage threshold;
• increasing the initial voltage threshold by a preset increment, until the obtained electrochemical impedance spectrum curve is a smooth curve;
• and
• using the voltage threshold corresponding to the smooth curve as the preset voltage threshold.