Power storage apparatus, transport device, and control method

• US 10,439,405 B2
• Filed: 01/11/2017
• Issued: 10/08/2019
• Est. Priority Date: 01/14/2016
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Kawamura, Masayuki
• Primary Examiner(s): Grant, Robert
• Assistant Examiner(s): Trischler, John T
• Application Number:
  US15/403,176
• Publication Number:
  US 20170207638A1
• Time in Patent Office: 1,000 Days
• Field of Search: 320103, 320104, 320166
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/44 by parameter estimation
• CPC Class Codes: B60L 3/0038 relating to sensors
• CPC Class Codes: B60L 3/0092 with use of redundant elements for safety purposes
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• 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 power storage apparatus includes a first storage module, a second storage module, a charge-discharge circuit, and circuitry. The first storage module includes a first detector to detect first current input to and output from the first capacitor. The second storage module includes a second detector to detect second current input to and output from the second capacitor. The charge-discharge circuit is connected to the first capacitor and the second capacitor to charge and discharge the first capacitor and the second capacitor. The circuitry is configured to control the charge-discharge circuit to control charging and discharging between the first capacitor and the second capacitor. The circuitry is configured to determine whether or not at least one of the first detector and the second detector is to be corrected based on the first current and the second current during charging and discharging between the first capacitor and the second capacitor.

Claims

1. A power storage apparatus comprising:

a first storage module comprising;

a first capacitor; and

a first detector to detect first current input to and output from the first capacitor;

a second storage module comprising;

a second capacitor; and

a second detector to detect second current input to and output from the second capacitor;

a charge-discharge circuit connected to the first capacitor and the second capacitor to charge and discharge the first capacitor and the second capacitor; and

circuitry configured to

control the charge-discharge circuit to control charging and discharging between the first capacitor and the second capacitor; and

determine whether or not at least one of the first detector or the second detector is to be corrected based on the first current and the second current during charging and discharging between the first capacitor and the second capacitor,

wherein the circuitry calculates an average value of the first current and the second current, and

wherein the circuitry determines that the at least one of the first detector or the second detector is to be corrected if a difference between at least one of the first current or the second current and the average value is larger than a threshold current.

2. The power storage apparatus according to claim 1, wherein the charging and discharging between the first capacitor and the second capacitor comprise charging and discharging in which current flows from the first capacitor to the second capacitor, and charging and discharging in which current flows from the second capacitor to the first capacitor.

3. The power storage apparatus according to claim 1, wherein

the charge-discharge circuit comprises an inductor, and

the circuitry determines whether or not the circuitry corrects the first detector and the second detector based on the first current and the second current after elapse of a predetermined time from start of charging and discharging between the first capacitor and the second capacitor.

4. The power storage apparatus according to claim 1, wherein the charge-discharge circuit comprises a converter that converts at least one of an output voltage of the first capacitor or an output voltage of the second capacitor, and

the circuitry corrects at least one of the first current or the second current based on a predetermined coefficient in the converter.

5. The power storage apparatus according to claim 1, wherein the circuitry corrects at least one of the first detector or the second detector when the circuitry determines that the circuitry corrects the first detector and the second detector.

6. The power storage apparatus according to claim 1, wherein the circuitry corrects both of the first detector and the second detector when the circuitry determines that the circuitry corrects the first detector and the second detector.

7. The power storage apparatus according to claim 1, wherein the second capacitor is superior to the first capacitor in an output weight density, and is inferior in an energy weight density.

8. A transport device comprising the power storage apparatus according to claim 1.

9. A power storage apparatus comprising:

a first storage module comprising;

a first capacitor; and

a first detector to detect first current input to and output from the first capacitor;

a second storage module comprising;

a second capacitor; and

a second detector to detect second current input to and output from the second capacitor;

a charge-discharge circuit connected to the first capacitor and the second capacitor to charge and discharge the first capacitor and the second capacitor; and

circuitry configured to

control the charge-discharge circuit to control charging and discharging between the first capacitor and the second capacitor; and

determine whether or not at least one of the first detector or the second detector is to be corrected based on the first current and the second current during charging and discharging between the first capacitor and the second capacitor,

wherein the charge-discharge circuit comprises an inductor,

wherein the circuitry determines whether or not the circuitry corrects the first detector and the second detector based on the first current and the second current after elapse of a predetermined time from start of charging and discharging between the first capacitor and the second capacitor, and

wherein the predetermined time is based on the inductance of the inductor.

10. A power storage apparatus comprising:

a first storage module comprising;

a first capacitor; and

a first detector to detect first current input to and output from the first capacitor;

a second storage module comprising;

a second capacitor; and

a second detector to detect second current input to and output from the second capacitor;

a charge-discharge circuit connected to the first capacitor and the second capacitor to charge and discharge the first capacitor and the second capacitor; and

circuitry configured to

control the charge-discharge circuit to control charging and discharging between the first capacitor and the second capacitor; and

determine whether or not at least one of the first detector or the second detector is to be corrected based on the first current and the second current during charging and discharging between the first capacitor and the second capacitor,

wherein the charge-discharge circuit comprises a converter that converts at least one of an output voltage of the first capacitor or an output voltage of the second capacitor,

wherein the circuitry corrects at least one of the first current or the second current based on a predetermined coefficient in the converter, and

wherein the predetermined coefficient is a voltage conversion ratio of the converter.

11. A control method comprising:

controlling charging and discharging between a first capacitor and a second capacitor;

determining whether or not at least one of a first detector or a second detector is to be corrected based on a first current and a second current during charging and discharging between the first capacitor and the second capacitor, the first detector being to detect the first current input to and output from the first capacitor, the second detector being to detect the second current input to and output from the second capacitor; and

calculating an average value of the first current and the second current,

wherein it is determined that the at least one of the first detector or the second detector is to be corrected if a difference between at least one of the first current or the second current and the average value is larger than a threshold current.