Energy storage device management apparatus, energy storage device module, vehicle, and energy storage device management method

Patent metadata

Field	Value
Publication number	US-10712393-B2
Application number	US-201716069442-A
Country	US
Kind code	B2
Filing date	Jan 13, 2017
Priority date	Jan 15, 2016
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

The present invention is to improve the estimation accuracy of an SOC of a storage element. A storage element management device disclosed in the present description is a battery management device 50 that determines an SOC range indicating a state-of-charge of a secondary battery 30 , and has a constitution including a central processing unit 61 that sets an overlapping range between an SOC range (i) R 1 , determined by a current integration method, and an SOC range (v) R 2 , determined by a voltage reference method in a stage where the SOC range (i) R 1 is determined by the current integration method, as a new SOC range R 3.

First claim

The invention claimed is:

1. An energy storage device management apparatus configured to determine an SOC region that indicates a state of charge of an energy storage device, the apparatus comprising:
an information processor which determines the SOC region based on a first SOC region, which is determined by a first method, and a second SOC region, which is determined by a second method different than the first method when the first SOC region is determined,
wherein:
the information processor determines whether the first SOC region and the second SOC region overlap one another or not, and, when the first SOC region and the second SOC region overlap, determines an overlapped region in which the first SOC region and the second SOC region overlap as the SOC region; and
the SOC region, the first SOC region, and the second SOC region are all data in a range.

2. The energy storage device management apparatus according to claim 1 , wherein:
the first method determines the first SOC region based on a state from a previous SOC region with time of the energy storage device,
the second method determines the second SOC region based on a state of the energy storage device when the first SOC region is determined, and
the second SOC region is determined as the SOC region when the first SOC region and the second SOC region do not overlap.

3. The energy storage device management apparatus according to claim 2 , wherein:
the first SOC region is determined by time-integration of a current that flows through the energy storage device, and
the second SOC region is determined by an SOC-V correlation of the energy storage device and a voltage of the energy storage device.

4. The energy storage device management apparatus according to claim 1 , wherein the information processor determines the second SOC region based on an SOC-OCV correlation which is a correlation between a state of charge and an open circuit voltage of the energy storage device in a non-energization state.

5. The energy storage device management apparatus according to claim 4 , wherein the information processor determines the second SOC region based on an SOC-OCV correlation of the energy storage device after being charged and an SOC-OCV correlation of the energy storage device after being discharged.

6. The energy storage device management apparatus according to claim 1 , wherein:
the information processor determines the second SOC region based on a C-V correlation which is a correlation between a residual capacity and a charging voltage of the energy storage device during charge, and
the information processor determines the second SOC region as a full-charge SOC region, which is a state close to a full-charge state of the energy storage device, when a charging current is less than a predetermined current value and the charging voltage is more than a predetermined voltage value.

7. The energy storage device management apparatus according to claim 6 , wherein the information processor determines the second SOC region as a not-full-charge SOC region, which is a region different from the full-charge SOC region, when the charging current is more than the predetermined current value and the charging voltage is less than the predetermined voltage value.

8. The energy storage device management apparatus according to claim 1 , wherein:
the information processor determines the second SOC region based on a C-V correlation which is a correlation between a residual capacity and a discharging voltage of the energy storage device during discharge, and
the information processor determines the second SOC region as a discharge-end SOC region, which is a state close to a discharge-end state of the energy storage device, when a discharging current is less than a predetermined current value and a discharging voltage is less than a predetermined voltage value.

9. The energy storage device management apparatus according to claim 8 , wherein the information processor determines the second SOC region as a not-discharge-end SOC region, which is a region different from the discharge-end SOC region, when the discharging current is more than the predetermined current value and the discharging voltage is more than the predetermined voltage value.

10. The energy storage device management apparatus according to claim 1 , wherein:
the information processor sections the state of charge of the energy storage device into plural SOC regions, the SOC region, of which a voltage variation relative to an SOC variation is smaller than that of another SOC region, being a small-variation region, and
the energy storage device is charged or discharged when the first SOC region is in the small-variation region for a predetermined time, and the second SOC region is made to be a region different from the first SOC region.

11. The energy storage device management apparatus according to claim 10 , wherein the information processor changes the second SOC region as to be in a region different from a small-variation region in which the second SOC region currently is.

12. An energy storage device module comprising:
an energy storage device;
a current measurement unit which detects a current that flows through the energy storage device;
a voltage measurement unit which detects a voltage of the energy storage device;
a memory which records information on a correlation between a voltage and an SOC of the energy storage device; and
the energy storage device management apparatus according to claim 1 .

13. A vehicle comprising:
the energy storage device module according to claim 12 ;
a vehicle load supplied with electric power from the energy storage device module; and
a vehicle electronic control unit which controls the vehicle load and is capable of communicating with the energy storage device module.

14. An energy storage device management method which determines an SOC estimation value that is a value indicating a state of charge of an energy storage device, the method comprising:
determining a first SOC region by a first method and a second SOC region by a second SOC method different than the first method;
determining whether the first SOC region and the second SOC region overlap one another or not; and
when the first SOC region and the second SOC region overlap, determining a SOC region based upon an overlapped region in which the first SOC region and the second SOC region overlap,
wherein
the SOC region, the first SOC region, and the second SOC region are all data in a range.

15. An energy storage device management apparatus configured to determine an SOC region that indicates a state of charge of an energy storage device, the apparatus comprising:
an information processor which determines the SOC region based on a first SOC region, which is determined by a first method, and a second SOC region, which is determined by a second method when the first SOC region is determined,
wherein:
the information processor determines the second SOC region based on a C-V correlation which is a correlation between a residual capacity and a charging voltage of the energy storage device during charge, and
the information processor determines the second SOC region as a full-charge SOC region, which is a state close to a full-charge state of the energy storage device, when a charging current is less than a predetermined current value and the charging voltage is more than a predetermined voltage value.

16. The energy storage device management apparatus according to claim 15 , wherein the information processor determines the second SOC region as a not-full-charge SOC region, which

Assignees

• Gs Yuasa Int Ltd

Inventors

• Sejima Kenichi

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M10/48

  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 title

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• B60L50/64 Primary

  Constructional details of batteries specially adapted for electric vehicles · CPC title