STORAGE CAPACITY MANAGEMENT SYSTEM

• US 20120133332A1
• Filed: 06/29/2010
• Published: 05/31/2012
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Ogane, Takashi, Maruno, Naoki, Ohnuma, Yoshikazu
• Granted Patent: US 8,947,051 B2
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/3828 using current integration
• 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 10/486 for measuring temperature
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

A storage capacity management system includes an upper limit terminal voltage inducing part for inducing an upper limit terminal voltage which is a terminal voltage when the storage capacity of the battery is an upper limit storage capacity, a lower limit terminal voltage inducing part for inducing a lower limit terminal voltage which is a terminal voltage when the storage capacity of the battery is a lower limit storage capacity, an upper and lower limit voltage width calculating part for calculating an upper and lower limit voltage width by subtracting the lower limit terminal voltage from the upper limit terminal voltage, an intermediate voltage difference calculating part for calculating an intermediate voltage difference by subtracting the lower limit terminal voltage from a terminal voltage of the battery, an upper and lower limit voltage ratio calculating part for calculating an upper and lower limit voltage difference which is a ratio of the intermediate voltage difference to the upper and lower limit voltage width, an intermediate determination voltage ratio inducing part for inducing an intermediate determination voltage ratio according to upper and lower limit capacities of the battery, a voltage ratio comparing part for comparing the upper and lower voltage ratio with the intermediate determination voltage ratio, and an intermediate storage capacity inducing part for inducing an intermediate storage capacity based on the upper limit storage capacity, the lower limit storage capacity and the intermediate determination voltage ratio when the results of the comparison by the voltage ratio comparing part satisfy a predetermined condition. Consequently, the storage capacity of the battery can be managed with high accuracy.

Claims

1. A storage capacity management system for managing a storage capacity of a battery, including:

an upper limit terminal voltage inducing part for inducing an upper limit terminal voltage which is a terminal voltage when the storage capacity of the battery is an upper limit storage capacity;

a lower limit terminal voltage inducing part for inducing a lower limit terminal voltage which is a terminal voltage when the storage capacity of the battery is a lower limit storage capacity;

an upper and lower limit voltage width calculating part for calculating an upper and lower limit voltage width by subtracting the lower limit terminal voltage from the upper limit terminal voltage;

an intermediate voltage difference calculating part for calculating an intermediate voltage difference by subtracting the lower limit terminal voltage from a terminal voltage of the battery;

an upper and lower limit voltage ratio calculating part for calculating an upper and lower limit voltage difference which is a ratio of the intermediate voltage difference to the upper and lower limit voltage width;

an intermediate determination voltage ratio inducing part for inducing an intermediate determination voltage ratio according to upper and lower limit capacities of the battery;

a voltage ratio comparing part for comparing the upper and lower voltage ratio with the intermediate determination voltage ratio; and

an intermediate storage capacity inducing part for inducing an intermediate storage capacity based on the upper limit storage capacity, the lower limit storage capacity and the intermediate determination voltage ratio when the results of the comparison by the voltage ratio comparing part satisfy a predetermined condition.

5. The system of claim 1, further including:

a storage capacity estimating part for estimating a storage capacity of the battery based on integration of charge and discharge currents of the battery,

wherein the storage capacity management system changes a storage capacity estimated by the storage capacity estimating part to an intermediate storage capacity induced by the intermediate storage capacity inducing part when the results of the comparison by the voltage ratio comparing part satisfy a predetermined condition.

6. The system of claim 1,

wherein the upper limit terminal voltage and the lower limit terminal voltage differ according to charge and discharge currents and a temperature of the battery, and

wherein the intermediate determination voltage ratio differs according to the temperature of the battery.

7. The system of claim 1,

wherein the predetermined condition is that a state continues for a predetermined time period in which the upper and lower voltage ratio is equal to or lower than the intermediate determination voltage ratio.

8. The system of claim 1,

wherein the intermediate storage capacity inducing part calculates the intermediate voltage capacity by using a computational expression:

“

the lower limit storage capacity+(the upper limit storage capacity−

the lower limit storage capacity)×

the intermediate determination voltage ratio.”

2. A storage capacity management system for managing a storage capacity of a battery, including:

an upper limit terminal voltage inducing part for inducing an upper limit terminal voltage which is a terminal voltage when the storage capacity of the battery is an upper limit storage capacity;

a lower limit terminal voltage inducing part for inducing a lower limit terminal voltage which is a terminal voltage when the storage capacity of the battery is a lower limit storage capacity;

an upper side voltage difference calculating part for calculating an upper side voltage difference by subtracting a terminal voltage of the battery from the upper limit terminal voltage;

a lower side voltage difference calculating part for calculating a lower side voltage difference by subtracting the lower limit terminal voltage from the terminal voltage of the battery;

an upper and lower limit voltage ratio calculating part for calculating an upper and lower limit voltage difference which is a ratio of the lower side voltage difference to a sum of the upper side voltage difference and the lower side voltage difference;

an intermediate determination voltage ratio inducing part for inducing an intermediate determination voltage ratio according to upper and lower limit capacities of the battery;

a voltage ratio comparing part for comparing the upper and lower voltage ratio with the intermediate determination voltage ratio; and

an intermediate storage capacity inducing part for inducing an intermediate storage capacity based on the upper limit storage capacity, the lower limit storage capacity and the intermediate determination voltage ratio when the results of the comparison by the voltage ratio comparing part satisfy a predetermined condition.

3. A storage capacity management system for managing a storage capacity of a battery, including:

an upper limit terminal voltage inducing part for inducing an upper limit terminal voltage which is a terminal voltage when the storage capacity of the battery is an upper limit storage capacity;

a lower limit terminal voltage inducing part for inducing a lower limit terminal voltage which is a terminal voltage when the storage capacity of the battery is a lower limit storage capacity;

an upper and lower limit voltage width calculating part for calculating an upper and lower limit voltage width by subtracting the lower limit terminal voltage from the upper limit terminal voltage;

an intermediate voltage difference calculating part for calculating an intermediate voltage difference by subtracting the lower limit terminal voltage from a terminal voltage of the battery;

an upper and lower limit voltage ratio calculating part for calculating an upper and lower limit voltage difference which is a ratio of the intermediate voltage difference to the upper and lower limit voltage width;

an intermediate determination voltage ratio inducing part for inducing an intermediate determination voltage ratio according to upper and lower limit capacities of the battery;

a voltage ratio comparing part for comparing the upper and lower voltage ratio with the intermediate determination voltage ratio; and

an intermediate storage capacity inducing part for inducing an intermediate storage capacity which is set in advance when the results of the comparison by the voltage ratio comparing part satisfy a predetermined condition.

4. A storage capacity management system for managing a storage capacity of a battery, including:

an upper limit terminal voltage inducing part for inducing an upper limit terminal voltage which is a terminal voltage when the storage capacity of the battery is an upper limit storage capacity;

a lower limit terminal voltage inducing part for inducing a lower limit terminal voltage which is a terminal voltage when the storage capacity of the battery is a lower limit storage capacity;

an upper side voltage difference calculating part for calculating an upper side voltage difference by subtracting a terminal voltage of the battery from the upper limit terminal voltage;

a lower side voltage difference calculating part for calculating a lower side voltage difference by subtracting the lower limit terminal voltage from the terminal voltage of the battery;

an upper and lower limit voltage ratio calculating part for calculating an upper and lower limit voltage difference which is a ratio of the lower side voltage difference to a sum of the upper side voltage difference and the lower side voltage difference;

an intermediate determination voltage ratio inducing part for inducing an intermediate determination voltage ratio according to upper and lower limit capacities of the battery;

a voltage ratio comparing part for comparing the upper and lower voltage ratio with the intermediate determination voltage ratio; and

an intermediate storage capacity inducing part for inducing an intermediate storage capacity which is set in advance when the results of the comparison by the voltage ratio comparing part satisfy a predetermined condition.