Energy storage device management apparatus, energy storage device management method, energy storage device module, energy storage device management program, and movable body

Patent metadata

Field	Value
Publication number	US-2016259012-A1
Application number	US-201615056915-A
Country	US
Kind code	A1
Filing date	Feb 29, 2016
Priority date	Mar 5, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

An energy storage device management method for deciding an SOC estimated value includes: preparing first and second SOC estimation methods for estimating an SOC; and employing a predetermined value as the SOC estimated value when a first SOC region and a second SOC region are different. V-SOC correlation between a voltage and the state of charge of the energy storage device is sectioned into a plurality of SOC regions. The first SOC region is the SOC region that the SOC estimated by the first SOC estimation method belongs to, and the second SOC region is the SOC region that the SOC estimated by the second SOC estimation method belongs to. The predetermined value is set to a value close to a boundary value on a side close to the first SOC region of boundary values sectioning the second SOC region, or a value between the boundary value and an intermediate value of the second SOC region.

First claim

What is claimed is:

1 . An energy storage device management method for deciding an SOC estimated value, which is a value indicating a state of charge of an energy storage device, comprising:
preparing first and second SOC estimation methods for estimating an SOC of the energy storage device in ways different from each other; and employing a predetermined value as the SOC estimated value when a first SOC region and a second SOC region are different from each other, wherein a V-SOC correlation between a voltage and the state of charge of the energy storage device is sectioned into a plurality of SOC regions, the first SOC region is the SOC region that the SOC estimated by the first SOC estimation method belongs to, and the second SOC region is the SOC region that the SOC estimated by the second SOC estimation method belongs to, and the predetermined value is set to 1) a value close to a boundary value on a side close to the first SOC region of boundary values sectioning the second SOC region, or 2) a value between the boundary value and an intermediate value of the second SOC region.

2 . The energy storage device management method according to claim 1 , wherein the first SOC estimation method is a method in which the SOC of the energy storage device is estimated, using data obtained by measuring a current flowing in/from the energy storage device, and the second SOC decision method is a method in which the SOC of the energy storage device is estimated, using data obtained by measuring the voltage of the energy storage device.

3 . The energy storage device management method according to claim 1 , wherein when the first SOC region and the second SOC region are same, the SOC estimated based on the first SOC estimation method is employed as the SOC estimated value.

4 . The energy storage device management method according to claim 1 , wherein one of the SOC regions is a region corresponding to a voltage flat region in which as to the voltage of the energy storage device, change of the voltage to the change of the SOC in the V-SOC correlation is smaller than that in an other region.

5 . An energy storage device management apparatus, comprising:
an information processor that outputs an SOC estimated value, which is a value indicating a state of charge of an energy storage device, and executes first and second SOC estimation methods for estimating an SOC of the energy storage device in ways different from each other, wherein a V-SOC correlation between a voltage and the state of charge of the energy storage device is sectioned into a plurality of SOC regions, the information processor employs a predetermined value as the SOC estimated value when a first SOC region and a second SOC region are different from each other, the first SOC region being the SOC region that the SOC estimated by the first SOC estimation method belongs to, and the second SOC region being the SOC region that the SOC estimated by the second SOC estimation method belongs to, and the predetermined value is set to 1) a value close to a boundary value on a side close to the first SOC region of boundary values sectioning the second SOC region, or 2) a value between the boundary value and an intermediate value of the second SOC region.

6 . The energy storage device management apparatus according to claim 5 , wherein the first SOC estimation method is a method in which the SOC of the energy storage device is estimated, using data obtained by measuring a current flowing in/from the energy storage device, and the second SOC estimation method is a method in which the SOC of the energy storage device is estimated, using data obtained by measuring the voltage of the energy storage device.

7 . The energy storage device management apparatus according to claim 5 , wherein when the first SOC region and the second SOC region are same, the SOC estimated based on the first SOC estimation method is employed as the SOC estimated value.

8 . The energy storage device management apparatus according to claim 5 , wherein one of the SOC regions is a region corresponding to a voltage flat region in which as to the voltage of the energy storage device, change of the voltage to the change of the SOC in the V-SOC correlation is smaller than that in an other region.

9 . The energy storage device management apparatus according to claim 8 , wherein the V-SOC correlation includes information regarding a plurality of the voltage flat regions.

10 . The energy storage device management apparatus according to claim 5 , wherein the energy storage device is a lithium ion battery including an iron-phosphate based positive active material.

11 . An energy storage device module, comprising:
an energy storage device; and the energy storage device management apparatus according to claim 5 .

12 . An energy storage device management program for causing a computer that controls an energy storage device to decide an SOC estimated value, which is a value indicating a state of charge of the energy storage device, the computer executing first and second SOC estimation methods for estimating an SOC of the energy storage device in ways different from each other, wherein the program causes the computer to perform:
employing a predetermined value as the SOC estimated value when a first SOC region and a second SOC region are different from each other, wherein a V-SOC correlation between a voltage and the state of charge of the energy storage device is sectioned into a plurality of SOC regions, the first SOC region is the SOC region that the SOC estimated by the first SOC estimation method belongs to, and the second SOC region is the SOC region that the SOC estimated by the second SOC estimation method belongs to, and the predetermined value is set to 1) a value close to a boundary value on a side close to the first SOC region of boundary values sectioning the second SOC region, or 2) a value between the boundary value and an intermediate value of the second SOC region.

13 . A movable body, comprising:
an energy storage device; and the energy storage device management apparatus according to claim 5 .

Assignees

• Gs Yuasa Int Ltd

Inventors

• Sejima Kenichi
• Shiraishi Takeyuki
• Mizuta Yoshihiko

Classifications

• G01R31/3624

  Physics · mapped topic

• G01R31/3651 Primary

  Physics · mapped topic

• G01R31/3842 Primary

  combining voltage and current measurements · CPC title

• G01R31/367 Primary

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title