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Battery electrochemical impedance spectrum generation method and system, automobile and medium

A technology of electrochemical impedance spectroscopy, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of long electrochemical impedance spectroscopy time, large installation space, etc., achieve high accuracy, increase speed, and reduce the cost of external equipment Effect

Pending Publication Date: 2022-04-05
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Embodiments of the present invention provide a battery electrochemical impedance spectrum generation method, system, vehicle, and medium to solve the problem of large installation space required to measure and obtain electrochemical impedance spectrum for a long time

Method used

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  • Battery electrochemical impedance spectrum generation method and system, automobile and medium
  • Battery electrochemical impedance spectrum generation method and system, automobile and medium
  • Battery electrochemical impedance spectrum generation method and system, automobile and medium

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] In one embodiment, as figure 1 As shown, a method for generating electrochemical impedance spectroscopy of a battery is provided, comprising the steps of:

[0023] S10: When the battery is in a discharging state, regularly collect battery discharge information of the battery according to a preset collection period, wherein the battery discharge information includes collection time and current information and voltage information associated with t...

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Abstract

The invention discloses a battery electrochemical impedance spectroscopy generation method and system, an automobile and a medium. According to the method, when a battery is in a discharging state, battery discharging information of the battery is collected regularly according to a preset collection period, and the battery discharging information comprises collection time and current information and voltage information associated with the collection time; performing Fourier transform according to the acquisition period and the battery discharge information to obtain a plurality of first battery signals based on frequency; determining a second battery signal from the plurality of first battery signals; the second battery signal comprises a voltage signal greater than or equal to a preset voltage threshold; and determining the electrochemical impedance of the corresponding frequency according to the second battery signal, and constructing an electrochemical impedance spectrum according to all the electrochemical impedance. According to the invention, the electrochemical impedance corresponding to different frequencies can be constructed in a short time without external equipment, and the constructed electrochemical impedance spectrum has high accuracy.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery electrochemical impedance spectrum generation method, system, vehicle and medium. Background technique [0002] With the development of science and technology, lithium battery technology has gradually developed. In order to understand the internal characteristics of lithium batteries (such as lithium ion diffusion coefficient, AC impedance value, etc.) in more detail, it is generally achieved by measuring the electrochemical impedance spectrum of lithium batteries, and then carry out aging detection and analysis of lithium batteries through the obtained internal characteristics. [0003] In the prior art, the electrochemical impedance spectroscopy of the lithium battery is generally obtained by measuring with electrochemical workstation equipment. However, this method has the following disadvantages: it takes a long time to measure the electrochemical impedance spect...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R31/3842G01R31/392
CPCG01R31/389G01R31/3842H01M10/0525H01M10/48H02J7/0047Y02E60/10G01R23/16G01R31/385G01R31/392G01R19/16576G01R31/396G01R31/367B60L58/10G01R25/00
Inventor 冯天宇邓林旺舒时伟李晓倩
Owner BYD CO LTD
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