STORAGE BATTERY CONTROLLING DEVICE, CONTROLLING METHOD, NON-TRANSITORY COMPUTER READABLE MEDIUM, POWER STORAGE SYSTEM, AND POWER SYSTEM

• US 20180006335A1
• Filed: 08/31/2017
• Published: 01/04/2018
• Est. Priority Date: 09/15/2015
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: FUJITA, Yumi, MORITA, Tomokazu, ISHll, Ena, SUGIYAMA, Nobukatsu
• Granted Patent: US 10,644,359 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/446 Initial charging measures
• 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 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2010/4278 Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0045 concerning the insertion or the connection of the batteries
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A storage battery controlling device according to an embodiment of the present invention includes: a battery characteristic estimator configured to calculate an internal resistance of a secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery therein, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery; and an input/output performance value calculator configured to calculate an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator.

Claims

1. A storage battery controlling device comprising:

a battery characteristic estimator configured to calculate an internal resistance of a secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery; and

an input/output performance value calculator configured to calculate an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator.

2. The storage battery controlling device according to claim 1, wherein

the input/output performance value calculator calculates an inputtable/outputtable current within a predetermined fixed period on the basis of the fixed period and the function, calculates a voltage drop of the secondary battery on the basis of the internal resistance and the inputtable/outputtable current within the fixed period, and calculates the inputtable/outputtable power amount of the secondary battery within the fixed period on the basis of the function and the voltage drop.

3. The storage battery controlling device according to claim 1, wherein

the battery characteristic estimator calculates initial charge amounts and masses of a positive electrode and a negative electrode of the secondary battery on the basis of the data of the temperature, the voltage and the current of the secondary battery, and on the basis of those calculated, calculates the function.

4. The storage battery controlling device according to claim 1, further comprising

an internal resistance corrector configured to calculate an internal resistance at a predetermined reference temperature on the basis of the data of the temperature of the secondary battery and the internal resistance calculated by the battery characteristic estimator, wherein

the input/output performance value calculator calculates the inputtable/outputtable power amount of the secondary battery at the reference temperature on the basis of the internal resistance at the reference temperature.

5. The storage battery controlling device according to claim 4, wherein

the internal resistance corrector calculates three resistance components of a reaction resistance component, an ohmic resistance component and a diffusion resistance component from the internal resistance calculated by the battery characteristic estimator on the basis of a predetermined calculating method, and calculates the internal resistance at the reference temperature by calculating and adding values of the three resistance components at the reference temperature on the basis of transformation expressions respectively predetermined for the three resistance components.

6. The storage battery controlling device according to claim 5, wherein

the internal resistance corrector calculates the three resistance components by regarding the ohmic resistance component and the diffusion resistance component as fixed values, and setting a difference between the internal resistance calculated by the battery characteristic estimator and a sum of the reaction resistance component and the diffusion resistance component to the reaction resistance component.

7. The storage battery controlling device according to claim 5, wherein

the internal resistance corrector calculates the three resistance components by estimating the ohmic resistance component and the diffusion resistance component on the basis of an accumulated time or an accumulated power amount regarding charge and discharge of the secondary battery, and setting a difference between the internal resistance calculated by the battery characteristic estimator and a sum of the ohmic resistance component and the diffusion resistance component to the reaction resistance component.

8. The storage battery controlling device according to claim 5, wherein

the internal resistance corrector calculates the reaction resistance component and the diffusion resistance component by beforehand holding first relationship data indicating relationship between a reaction resistance and a charge amount, and second relationship data indicating relationship between a diffusion resistance and the charge amount, and performing regression calculation on the basis of the first and second relationship data, and calculates the three resistance components by setting a difference between the internal resistance calculated by the battery characteristic estimator and a sum of the reaction resistance component and the diffusion resistance component to the ohmic resistance component.

9. The storage battery controlling device according to claim 5, wherein

the internal resistance corrector calculates the three resistance components by beforehand holding first relationship data indicating relationship between a reaction resistance and a charge amount, second relationship data indicating relationship between an ohmic resistance and the charge amount, and third relationship data indicating relationship between a diffusion resistance and the charge amount, and performing regression calculation on the basis of the first to third relationship data.

10. A controlling method by which a computer executes:

calculating an internal resistance of a secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery; and

calculating an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator.

11. A non-transitory computer readable medium having a computer program stored therein which causes a computer when executed by the computer, to perform processes comprising:

calculating an internal resistance of a secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery; and

calculating an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator.

12. A power storage system comprising:

a storage battery;

a storage battery controlling device; and

a control system, wherein

the storage battery includes s one or more secondary batteries and performs charge or discharge under a predetermined condition for every fixed period,

the storage battery controlling device includes

a battery characteristic estimator configured to calculate an internal resistance of the secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery, and

an input/output performance value calculator configured to calculate an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator,

the storage battery controlling device reports each of the inputtable/outputtable power amounts of the secondary batteries in the storage battery to the control system, and

the control system generates an instruction of charge/discharge with respect to the storage battery on the basis of each of the inputtable/outputtable power amounts of the secondary batteries in the storage battery, and reports the instruction to the storage battery controlling device or the storage battery.

13. A power system comprising:

a storage battery;

a storage battery controlling device;

a control system; and

a power generating system or a power line system or both of these, wherein

the storage battery includes one or more secondary batteries and performs charge or discharge under a predetermined condition for every fixed period,

the storage battery controlling device includes

a battery characteristic estimator configured to calculate an internal resistance of the secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery, and

an input/output performance value calculator configured to calculate an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator,

the storage battery controlling device reports each of the inputtable/outputtable power amounts of the secondary batteries in the storage battery to the control system, and

the control system determines an input/output amount of power with respect to the power generating system or the power line system or both of these on the basis of each of the inputtable/outputtable power amounts of the secondary batteries in the storage battery, generates an instruction of charge/discharge with respect to the storage battery, and reports the instruction to the storage battery controlling device or the storage battery.