CONTROL APPARATUS AND CONTROL METHOD FOR SECONDARY BATTERY

• US 20150022157A1
• Filed: 01/13/2012
• Published: 01/22/2015
• Est. Priority Date: 01/13/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Takahashi, Kenji
• Granted Patent: US 9,728,992 B2
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/0069 Charging or discharging for charge maintenance, battery initiation or rejuvenation
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A control apparatus has a controller configured to control charge and discharge of a secondary battery. The controller acquires a positive electrode potential and a negative electrode potential of the secondary battery. The controller controls the charge and discharge of the secondary battery such that each of the positive electrode potential and the negative electrode potential changes within a range between an upper limit value and a lower limit value set for each of the positive electrode potential and the negative electrode potential.

Claims

1. A control apparatus comprising a controller configured to control charge and discharge of a secondary battery,

wherein the controller acquires a positive electrode potential and a negative electrode potential of the secondary battery,

the controller controls the charge and discharge of the secondary battery such that each of the positive electrode potential and the negative electrode potential changes within a range between an upper limit value and a lower limit value set for each of the positive electrode potential and the negative electrode potential,

the controller uses a deterioration parameter to correct a local charge rate of each of a positive electrode and a negative electrode and corrects an open circuit potential of each of the positive electrode and the negative electrode on the basis of the corrected local charge rate and open circuit potential characteristic data in the acquisition of the positive electrode potential and the negative electrode potential,

the deterioration parameter includes a single electrode capacity ratio in the positive electrode, a single electrode capacity ratio in the negative electrode, and a variation in battery capacity of the secondary battery due to a change in correspondence between an average charge rate within an active material of the positive electrode and an average charge rate within an active material of the negative electrode, the change being a change from an initial state, and

the open circuit potential characteristic data is data defining a relationship between the local charge rate at a surface of the active material of the positive electrode and the open circuit potential of the positive electrode and a relationship between the local charge rate at a surface of the active material of the negative electrode and the open circuit potential of the negative electrode.

6. The control apparatus according to claim 1, wherein the controller reduces an upper limit value of electric power to which input to the secondary battery is allowed, when the positive electrode potential is higher than an upper limit value for the positive electrode potential or when the negative electrode potential is lower than a lower limit value for the negative electrode potential.

7. The control apparatus according to claim 1, wherein the controller reduces an upper limit value of electric power to which output from the secondary battery is allowed, when the positive electrode potential is lower than a lower limit value for the positive electrode potential or when the negative electrode potential is higher than an upper limit value for the negative electrode potential.

2-5. -5. (canceled)

8. A control method for controlling charge and discharge of a secondary battery, comprising:

acquiring a positive electrode potential and a negative electrode potential of the secondary battery,

controlling the charge and discharge of the secondary battery such that each of the positive electrode potential and the negative electrode potential changes within a range between an upper limit value and a lower limit value set for each of the positive electrode potential and the negative electrode potential,

using a deterioration parameter to correct a local charge rate of each of a positive electrode and a negative electrode, and

correcting an open circuit potential of each of the positive electrode and the negative electrode on the basis of the corrected local charge rate and open circuit potential characteristic data in the acquisition of the positive electrode potential and the negative electrode potential,

wherein the deterioration parameter includes a single electrode capacity ratio in the positive electrode, a single electrode capacity ratio in the negative electrode, and a variation in battery capacity of the secondary battery due to a change in correspondence between an average charge rate within an active material of the positive electrode and an average charge rate within an active material of the negative electrode, the change being a change from an initial state, and

the open circuit potential characteristic data is data defining a relationship between the local charge rate at a surface of the active material of the positive electrode and the open circuit potential of the positive electrode and a relationship between the local charge rate at a surface of the active material of the negative electrode and the open circuit potential of the negative electrode.