BATTERY RESIDUAL CAPACITANCE CALCULATION DEVICE AND BATTERY RESIDUAL CAPACITANCE CALCULATION METHOD

• US 20150134282A1
• Filed: 03/08/2013
• Published: 05/14/2015
• Est. Priority Date: 03/13/2012
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Soga, Tsutomu, Takano, Atsushi
• Granted Patent: US 10,310,025 B2
• Time in Patent Office: Days
• US Class Current: 702/63
• 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 2260/44 by parameter estimation
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• 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: G01R 31/3842 combining voltage and current measurements
• 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: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A residual capacity calculation apparatus for a battery includes: a current detection device to detect a charge/discharge current of the battery; a voltage detection device to detect a terminal voltage of the battery; a first residual capacity calculation unit to calculate a first residual capacity based on an integrated value of the charge/discharge current of the battery; a second residual capacity calculation unit to calculate a second residual capacity based on an open circuit voltage of the battery; a blend rate setting unit to determine a blend rate of the second residual capacity based on a deviation between the first residual capacity and the second residual capacity; and a third residual capacity calculation unit to calculate a post-combination residual capacity by subjecting the first residual capacity and the second residual capacity to weighted combination with use of the blend rate, in which the blend rate setting unit is configured to increase the blend rate as the deviation between the first residual capacity and the second residual capacity increases.

Claims

1-4. -4. (canceled)

5. A residual capacity calculation apparatus for a battery, comprising:

a current detection device adapted to detect a charge/discharge current of the battery;

a voltage detection device adapted to detect a terminal voltage of the battery;

a first residual capacity calculation unit adapted to calculate a first residual capacity based on an integrated value of the charge/discharge current of the battery;

a second residual capacity calculation unit adapted to calculate a second residual capacity based on an open circuit voltage of the battery;

a blend rate setting unit adapted to determine a blend rate of the second residual capacity based on a deviation between the first residual capacity and the second residual capacity; and

a third residual capacity calculation unit adapted to calculate a post-combination residual capacity by subjecting the first residual capacity and the second residual capacity to weighted combination with use of the blend rate,

wherein the blend rate setting unit is configured to increase the blend rate as the first residual capacity increases relative to the second residual capacity during discharging or as the second residual capacity increases relative to the first residual capacity during charging.

6. The residual capacity calculation apparatus for a battery according to claim 5, wherein the first residual capacity calculation unit is configured to:

calculate a change range of the first residual capacity in one calculation period based on an integrated value of a detection value of the charge/discharge current in the one calculation period, a full charge capacity determined in advance, and an error estimated value including any one of a detection error of the current detection device and an error of the full charge capacity; and

limit the second residual capacity to a value within an estimation value limit range to calculate a value as the first residual capacity.

7. A residual capacity calculation apparatus for a battery, comprising:

current detection means for detecting a charge/discharge current of the battery;

voltage detection means for detecting a terminal voltage of the battery;

first residual capacity calculation means for calculating a first residual capacity based on an integrated value of the charge/discharge current of the battery;

second residual capacity calculation means for calculating a second residual capacity based on an open circuit voltage of the battery;

blend rate setting means for determining a blend rate of the second residual capacity based on a deviation between the first residual capacity and the second residual capacity; and

third residual capacity calculation means for calculating a post-combination residual capacity by subjecting the first residual capacity and the second residual capacity to weighted combination with use of the blend rate,

wherein the blend rate setting means is configured to increase the blend rate as the first residual capacity increases relative to the second residual capacity during discharging or as the second residual capacity increases relative to the first residual capacity during charging.

8. A residual capacity calculation method for a battery, the battery comprising current detection device adapted to detect a charge/discharge current of the battery, and voltage detection device adapted to detect a terminal voltage of the battery;

the residual capacity calculation method comprising;

a first residual capacity calculation step of calculating a first residual capacity based on an integrated value of the charge/discharge current of the battery;

a second residual capacity calculation step of calculating a second residual capacity based on an open circuit voltage of the battery;

a step of setting a blend rate larger as the first residual capacity increases relative to the second residual capacity during discharging or as the second residual capacity increases relative to the first residual capacity during charging; and

a third residual capacity calculation step of calculating a post-combination residual capacity by subjecting the first residual capacity and the second residual capacity to weighted combination with use of the blend rate.