BATTERY MONITORING DEVICE

• US 20130030596A1
• Filed: 07/30/2012
• Published: 01/31/2013
• Est. Priority Date: 07/29/2011
• Status: Active Grant

• Current Assignee: Yokogawa Electric Corporation
• Original Assignee: Yokogawa Electric Corporation
• Inventors: OKADA, Syuhei, YOSHITAKE, Satoshi
• Granted Patent: US 9,448,287 B2
• Time in Patent Office: Days
• US Class Current: 700/297
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables

Abstract

A battery monitoring device for real-time measurement and monitoring of a battery module driving an actual load and having a plurality battery cells connected together in series, has a plurality of power and impedance calculators provided for the respective battery cells, and configured to receive voltage signals and current signals from the battery cells, respectively and to measure instantaneous power values and internal impedance characteristics of the battery cells, respectively, and a battery module state manager configured to receive output data of the power and impedance calculators via an internal bus.

Claims

1. A battery monitoring device for real-time measurement and monitoring of a battery module driving an actual load and having a plurality battery cells connected together in series, comprising:

a plurality of power and impedance calculators provided for the respective battery cells, and configured to receive voltage signals and current signals from the battery cells, respectively and to measure instantaneous power values and internal impedance characteristics of the battery cells, respectively; and

a battery module state manager configured to receive output data of the power and impedance calculators via an internal bus.

2. The battery monitoring device according to claim 1, further comprising:

an accelerator work monitor configured to monitor movement of an accelerator which is part of a vehicle driving system as a load device of the battery module, and to supply a resulting detection signal to the power and impedance calculators and the battery module state manager.

3. The battery monitoring device according to claim 1, wherein each of the power and impedance calculators is configured to perform discrete Fourier transformation or fast Fourier transformation, and to estimate constants of an equivalent circuit that exhibits an internal impedance characteristic of the associated battery cell in a desired frequency domain on the basis of results of the discrete Fourier transformation or fast Fourier transformation.

4. The battery monitoring device according to claim 1, wherein each of the power and impedance calculators is configured to acquire measurement data at such a time resolution and in such a time span that optimum estimation of a time constant of reaction occurring in a battery cell is enabled according to the reaction time constant, and to estimate constants of an equivalent circuit that are considered to govern the time constant using the acquired measurement data.

5. The battery monitoring device according to claim 1, wherein the power and impedance calculators are configured to receive pieces of temperature information of the battery cells, respectively.

6. The battery monitoring device according to claim 1, further comprising:

a pseudo-load device connected to the actual load in parallel and configured to generate a waveform including high-frequency components.

7. The battery monitoring device according to claim 1, further comprising:

a load control unit configured to drive and control the actual load according to a load program.

8. The battery monitoring device according to claim 2, wherein each of the power and impedance calculators is configured to perform discrete Fourier transformation or fast Fourier transformation, and to estimate constants of an equivalent circuit that exhibits an internal impedance characteristic of the associated battery cell in a desired frequency domain on the basis of results of the discrete Fourier transformation or fast Fourier transformation.

9. The battery monitoring device according to claim 2, wherein each of the power and impedance calculators is configured to acquire measurement data at such a time resolution and in such a time span that optimum estimation of a time constant of reaction occurring in a battery cell is enabled according to the reaction time constant, and to estimate constants of an equivalent circuit that are considered to govern the time constant using the acquired measurement data.

10. The battery monitoring device according to claim 2, wherein the power and impedance calculators are configured to receive pieces of temperature information of the battery cells, respectively.

11. The battery monitoring device according to claim 2, further comprising:

a pseudo-load device connected to the actual load in parallel and configured to generate a waveform including high-frequency components.

12. The battery monitoring device according to claim 2, further comprising:

a load control unit configured to drive and control the actual load according to a load program.