CELL STATUS ESTIMATION DEVICE AND POWER SUPPLY DEVICE

• US 20170274794A1
• Filed: 01/20/2016
• Published: 09/28/2017
• Est. Priority Date: 02/13/2015
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: TENMYO, HIROSHI, TAKEDA, MUTSUHIKO, YUASA, SHINICHI
• Application Number:
  US15/504,058
• Publication Number:
  US 20170274794A1
• Time in Patent Office: Days
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3828 using current integration
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A battery status estimation device includes an SOC determination unit for determining whether a charge rate of a battery should be estimated based on a full charge capacity or a dischargeable capacity of the battery, a full charge capacity estimation unit for estimating the full charge capacity, a discharge capacity estimation unit for estimating the dischargeable capacity, and a current integrated estimation unit for estimating the charge rate of the battery based on the full charge capacity or the dischargeable capacity.

Claims

1. A battery status estimation device for estimating a charge rate of a battery, the battery status estimation device comprising:

an SOC determination unit for determining whether the charge rate of the battery is estimated based on a full charge capacity or a dischargeable capacity of the battery;

a full charge capacity estimation unit for estimating the full charge capacity;

a discharge capacity estimation unit for estimating the dischargeable capacity; and

a current integrated estimation unit for estimating the charge rate of the battery based on the full charge capacity or the dischargeable capacity.

2. The battery status estimation device according to claim 1, wherein the SOC determination unit determines that, while the battery is discharged, when the charge rate of the battery estimated based on the full charge capacity lowers to a value equal to or below a predetermined value, the charge rate of the battery is estimated based on the dischargeable capacity.

3. The battery status estimation device according to claim 1, wherein the SOC determination unit calculates, while the battery is discharged, a difference between the charge rate of the battery estimated based on the full charge capacity and a charge rate estimated based on an open circuit voltage of the battery, and determines that, when the difference exceeds a predetermined value, the charge rate of the battery is estimated based on the dischargeable capacity.

4. The battery status estimation device according to claim 1, wherein the discharge capacity estimation unit estimates the dischargeable capacity, based on the full charge capacity estimated by the full charge capacity estimation unit and a discharge rate of the battery.

5. A power supply device comprising:

the battery status estimation device according to claim 1; and

a fuel meter,

wherein the fuel meter displays a remaining capacity of a battery based on a charge rate of the battery estimated by the battery status estimation device.

6. The battery status estimation device according to claim 2, wherein the discharge capacity estimation unit estimates the dischargeable capacity, based on the full charge capacity estimated by the full charge capacity estimation unit and a discharge rate of the battery.

7. The battery status estimation device according to claim 3, wherein the discharge capacity estimation unit estimates the dischargeable capacity, based on the full charge capacity estimated by the full charge capacity estimation unit and a discharge rate of the battery.

8. A power supply device comprising:

the battery status estimation device according to claim 2; and

a fuel meter,

wherein the fuel meter displays a remaining capacity of a battery based on a charge rate of the battery estimated by the battery status estimation device.

9. A power supply device comprising:

the battery status estimation device according to claim 3; and

a fuel meter,

wherein the fuel meter displays a remaining capacity of a battery based on a charge rate of the battery estimated by the battery status estimation device.

10. A power supply device comprising:

the battery status estimation device according to claim 4; and

a fuel meter,

wherein the fuel meter displays a remaining capacity of a battery based on a charge rate of the battery estimated by the battery status estimation device.