ELECTRICAL STORAGE DEVICE TEMPERATURE-MEASURING METHOD

• US 20150253204A1
• Filed: 05/21/2015
• Published: 09/10/2015
• Est. Priority Date: 01/11/2013
• Status: Abandoned Application

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: Alps Green Devices Co., Ltd. (Alps Alpine Co., Ltd.)
• Inventors: HEBIGUCHI, Hiroyuki
• Application Number:
  US14/718,484
• Publication Number:
  US 20150253204A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01K 13/00 Thermometers specially adapted for specific purposes
• CPC Class Codes: G01K 7/00 Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat giving results other than momentary value of temperature G01K3/00 ; Power supply therefor, e.g. using thermoelectric elements
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electrical storage device temperature-measuring method includes: measuring the real part of the internal impedance of an electrical storage device by using an alternating-current signal having a frequency at which the internal impedance or the real part of the internal impedance of the electrical storage device does not change according to the remaining capacity (SOC: state of charge) of the electrical storage device; and calculating the internal temperature of the electrical storage device from the measured value of the real part of the internal impedance.

Claims

1. An electrical storage device temperature-measuring method comprising:

measuring a real part of internal impedance of an electrical storage device by using an alternating-current signal having a frequency band in which the real part of the internal impedance of the electrical storage device does not change according to a remaining capacity (SOC;

state of charge) of the electrical storage device; and

calculating internal temperature of the electrical storage device from a measured value of the real part of the internal impedance.

2. The electrical storage device temperature-measuring method according to claim 1,

wherein the real part of the internal impedance of the electrical storage device is measured by using an alternating-current signal having a frequency band between 100 kHz and 1 MHz inclusive, and

wherein the internal temperature of the electrical storage device is calculated from a measured value of the real part of the internal impedance.

3. The electrical storage device temperature-measuring method according to claim 1,

wherein the real part of the internal impedance of the electrical storage device is measured by using an alternating-current signal having a frequency of 300 kHz, and

wherein the internal temperature of the electrical storage device is calculated from a measured value of the real part of the internal impedance.

7. The electrical storage device temperature-measuring method according to claim 1, wherein the alternating-current signal is superimposed on a direct current to be used for charging or discharging the electrical storage device.

8. The electrical storage device temperature-measuring method according to claim 1,

wherein the electrical storage device includes a current detection unit and a voltage detection unit for detecting the alternating-current signal, and

wherein at least one of the current detection unit and the voltage detection unit is used for calculating the remaining capacity of the electrical storage device.

9. The electrical storage device temperature-measuring method according to claim 8,

wherein a plurality of electrical storage devices each corresponding to the electrical storage device are connected in series, and

wherein the current detection unit, which is a single one, is connected in series to the plurality of electrical storage devices, and the voltage detection unit is provided for each of the plurality of electrical storage devices.

4. An electrical storage device temperature-measuring method comprising:

measuring internal impedance of an electrical storage device by using an alternating-current signal having a frequency band in which the internal impedance of the electrical storage device does not change according to a remaining capacity (SOC;

state of charge) of the electrical storage device; and

calculating internal temperature of the electrical storage device from a measured value of the internal impedance.

5. The electrical storage device temperature-measuring method according to claim 4,

wherein the internal impedance of the electrical storage device is measured by using an alternating-current signal having a frequency band between 10 kHz and 100 kHz inclusive, and

wherein the internal temperature of the electrical storage device is calculated from a measured value of the internal impedance.

6. The electrical storage device temperature-measuring method according to claim 4,

wherein the internal impedance of the electrical storage device is measured by using an alternating-current signal having a frequency of 30 kHz, and

wherein the internal temperature of the electrical storage device is calculated from a measured value of the internal impedance.

10. The electrical storage device temperature-measuring method according to claim 4, wherein the alternating-current signal is superimposed on a direct current to be used for charging or discharging the electrical storage device.

11. The electrical storage device temperature-measuring method according to claim 4,

wherein the electrical storage device includes a current detection unit and a voltage detection unit for detecting the alternating-current signal, and

wherein at least one of the current detection unit and the voltage detection unit is used for calculating the remaining capacity of the electrical storage device.

12. The electrical storage device temperature-measuring method according to claim 11,

wherein a plurality of electrical storage devices each corresponding to the electrical storage device are connected in series, and

wherein the current detection unit, which is a single one, is connected in series to the plurality of electrical storage devices, and the voltage detection unit is provided for each of the plurality of the electrical storage devices.