Energy storage apparatus, vehicle apparatus, and control method

Patent metadata

Field	Value
Publication number	US-2017113564-A1
Application number	US-201615333194-A
Country	US
Kind code	A1
Filing date	Oct 25, 2016
Priority date	Oct 27, 2015
Publication date	Apr 27, 2017
Grant date	—

Abstract

A converter is to convert at least one of a first voltage output from a first energy storage device and a second voltage output from a second energy storage device. A detector is to detect the first voltage and a current flowing between the first energy storage device and the second energy storage device. Circuitry is configured to control the converter to perform a first constant current control in which a first constant current flows from one of the first energy storage device and the second energy storage device to another of the first energy storage device and the second energy storage device. The circuitry is configured to determine a state of the first energy storage device based on the first voltage and the first constant current while the first constant current control is performed.

First claim

What is claimed is:

1 . An energy storage apparatus comprising:
a first energy storage device; a second energy storage device; a converter to convert at least one of a first voltage output from the first energy storage device and a second voltage output from the second energy storage device; a detector to detect the first voltage and a current flowing between the first energy storage device and the second energy storage device; and circuitry configured to:
control the converter to perform a first constant current control in which a first constant current flows from one of the first energy storage device and the second energy storage device to another of the first energy storage device and the second energy storage device; and
determine a state of the first energy storage device based on the first voltage and the first constant current while the first constant current control is performed.

2 . The energy storage apparatus according to claim 1 , wherein the circuitry calculates a capacity of the first energy storage device based on the first constant current while the first constant current control is performed and a difference between a state of charge of the first energy storage device corresponding to an open circuit voltage of the first energy storage device before the first constant current control is performed and a state of charge of the first energy storage device corresponding to an open circuit voltage of the first energy storage device after the first constant current control is performed, and
wherein the circuitry determines a state of the first energy storage device based on the capacity of the first energy storage device.

3 . The energy storage apparatus according to claim 1 ,
wherein the circuitry calculates an internal resistance of the first energy storage device based on an open circuit voltage of the first energy storage device detected before or after the first constant current control is performed, based on a closed circuit voltage of the first energy storage device detected while the first constant current control is performed, and based on the first constant current, and wherein the circuitry determines a state of the first energy storage device based on the internal resistance of the first energy storage device.

4 . The energy storage apparatus according to claim 3 ,
wherein, when a temperature of the first energy storage device is less than or equal to a threshold, the circuitry performs multiple first constant current controls with changing a current value of the first constant current, and wherein the circuitry determines a state of the first energy storage device based on resistance values of the internal resistance of the first energy storage device, each of which is calculated in each of the multiple first constant current controls, respectively.

5 . The energy storage apparatus according to claim 1 ,
wherein in addition to the first constant current control, the circuitry is configured to control the converter to perform second constant current control in which a second constant current flows from the another of the first energy storage device and the second energy storage device to the one of the first energy storage device and the second energy storage device, and wherein the circuitry determines a state of the first energy storage device based on the first constant current detected while the first constant current control is performed, the second constant current detected while the second constant current control is performed, the first voltage of the first energy storage device detected while the first constant control is performed, and the first voltage of the first energy storage device detected while the second constant current control is performed.

6 . The energy storage apparatus according to claim 5 ,
wherein the circuitry calculates a capacity of the first energy storage device based on the second constant current detected while the second constant current control is performed and a difference between a state of charge of the first energy storage device corresponding to an open circuit voltage detected before the second constant current control is performed and a state of charge of the first energy storage device corresponding to an open circuit voltage detected after the second constant current control is performed, and wherein the circuitry determines a state of the first energy storage device based on the capacity of the first energy storage device.

7 . The energy storage apparatus according to claim 5 ,
wherein the circuitry calculates an internal resistance of the first energy storage device based on an open circuit voltage of the first energy storage device detected before or after the second constant current control is performed, based on a closed circuit voltage of the first energy storage device detected while the second constant current control is performed, and based on the second constant current, and wherein the circuitry determines a state of the first energy storage device based on the internal resistance of the first energy storage device.

8 . An energy storage apparatus comprising:
a first energy storage device; a second energy storage device; a converter to convert at least one of a first voltage output from the first energy storage device and a second voltage output from the second energy storage device; a detector to detect the first voltage and a current flowing between the first energy storage device and the second energy storage device; circuitry configured to:
control the converter to perform a constant current control in which a constant current flows from one of the first energy storage device and the second energy storage device to another of the first energy storage device and the second energy storage device; and
determine a state of the first energy storage device based on the first voltage and the constant current while the constant current control is performed; and
determine a state of the second energy storage device based on the second voltage and the constant current while the constant current control is performed.

9 . A vehicle apparatus comprising the energy storage apparatus according to claim 1 .

10 . A vehicle apparatus comprising the energy storage apparatus according to claim 8 .

11 . A control method for an energy storage apparatus, comprising:
converting at least one of a first voltage output from a first energy storage device and a second voltage output from a second energy storage device to perform a first constant current control in which a constant current flows from one of the first energy storage device and the second energy storage device to another of the first energy storage device and the second energy storage device; detecting the first voltage and the constant current flowing between the first energy storage device and the second energy storage device; and determining a state of the first energy storage device based on the first voltage and the constant current while the first constant current control is performed.

12 . A control method for an energy storage apparatus, comprising:
converting at least one of a first voltage output from a first energy storage device and a second voltage output from a second energy storage device to perform a constant current control in which a constant current flows from one of the first energy storage device and the second energy storage device to another of the first energy storage device and the second energy storage device; detecting the first voltage, the second voltage, and the constant current flowing between the first energy storage device and the second energy storage device; dete

Assignees

• Honda Motor Co Ltd

Inventors

• Unno Ryota
• Takizawa Daijiro
• Oguma Hirokazu

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/92

  with prioritisation of loads or sources · CPC title

• H02J7/54

  Passive balancing, e.g. using resistors or parallel MOSFETs · CPC title

• B60L58/24

  for controlling the temperature of batteries · CPC title