IMPEDANCE ANALYZING DEVICE

• US 20130253862A1
• Filed: 05/10/2013
• Published: 09/26/2013
• Est. Priority Date: 01/06/2012
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Luo, Yi-Feng, Gong, Cihun-Siyong
• Granted Patent: US 9,322,884 B2
• Time in Patent Office: Days
• US Class Current: 702/63
• CPC Class Codes: G01R 27/02 Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant by measuring phase angle only G01R25/00
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/371 with remote indication, e.g. on external chargers
• CPC Class Codes: G01R 31/385 Arrangements for measuring battery or accumulator variables for monitoring G01R31/382
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health

Abstract

An impedance analyzing device, adapted to a testee comprising an electrode or at least one battery cell, includes a signal capturing unit, a signal adjusting unit, a signal analyzing unit, a processing unit, and a power source supply unit providing a variable-frequency voltage signal to the testee. The signal adjusting unit receiving and adjusts a variable-frequency voltage signal and the current signal to generate an adjusted variable-frequency voltage signal and an adjusted current signal. The signal capturing unit captures a current signal generated by the testee in response to the variable-frequency voltage signal. The signal analyzing unit receives and analyzes the adjusted variable-frequency voltage signal and the adjusted current signal in frequency domain to obtain a frequency domain parameter and/or a time domain parameter. The processing unit receives the frequency domain parameter and/or the time domain parameter to obtain an impedance variation characteristic of the testee.

Claims

1. An impedance analyzing device, adapted to a testee comprising an electrode or at least one battery cell, the impedance analyzing device comprising:

a power source supply unit, for providing a variable-frequency voltage signal to the testee, the variable-frequency voltage signal having a plurality of frequencies in a range between a first frequency and a second frequency;

a signal capturing unit, for capturing a current signal generated by the testee in response to the variable-frequency voltage signal;

a signal adjusting unit, coupled to the power source supply unit and the signal capturing unit, for receiving and adjusting the variable-frequency voltage signal and the current signal to generate an adjusted variable-frequency voltage signal and an adjusted current signal;

a signal analyzing unit, coupled to the signal capturing unit, for receiving and analyzing the adjusted variable-frequency voltage signal and the adjusted current signal in frequency domain to obtain at least one of a frequency domain parameter and a time domain parameter; and

a processing unit, coupled to the signal analyzing unit, for receiving the at least one of the frequency domain parameter and the time domain parameter, and for obtaining an impedance variation characteristic of the testee according to the at least one of the frequency domain parameter and the time domain parameter.

2. The impedance analyzing device according to claim 1, wherein the processing unit further estimates state of charge (SOC) and state of health (SOH) of the at least one battery cell according to an electrochemistry characteristic of the battery cell and a temperature signal.

3. The impedance analyzing device according to claim 1, wherein the impedance analyzing device analyzes the testee in real time in an online manner.

4. The impedance analyzing device according to claim 1, wherein the impedance analyzing device is embodied on a chip by an Integrated Circuit (IC) design, and is disposed on a user or an electronic device having batteries.

5. The impedance analyzing device according to claim 1, wherein the processing unit comprises:

a wireless transmitting unit, coupled to the signal analyzing unit, for receiving the at least one of the frequency domain parameter and the time domain parameter, for converting the at least one of the frequency domain parameter and the time domain parameter into a wireless signal, and for transmitting the wireless signal;

a wireless receiving unit, for receiving the wireless signal; and

an analyzing unit, coupled to the wireless receiving unit, for receiving the wireless signal, converting the wireless signal to extract the at least one of the frequency domain parameter and the time domain parameter, and according to the at least one of the frequency domain parameter and the time domain parameter, obtaining an electrochemistry characteristic corresponding to the testee.