# US 9,520,735 B2 · Storage battery control system and storage battery control method

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- Number: US 9,520,735 B2
- Document ID: US9520735B2
- Status: Granted
- Kind: B2
- Application number: 13/669,853
- Filed: 2012-11-06
- Published: 2013-11-14
- Granted: 2016-12-13
- Earliest claimed: 2011-11-10
- Assignees: Hitachi, Ltd.
- Applicants: Hitachi, Ltd.
- Inventors: Taminori Tomita; Yasuko Shiga; Yoshihito Nasu
- Web page: https://patentgrep.com/patent/US9520735B2

## CPC

- H01M 10/42: Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence)
- H01M 10/441: {for several batteries or cells simultaneously or sequentially}
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- 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}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A storage battery control system comprises multiple storage batteries disposed in a power grid, and a storage battery control apparatus. The storage battery control apparatus is communicably coupled to the multiple storage batteries and an energy management system. The storage battery control apparatus acquires storage battery information comprising a charging-discharging performance and a remaining capacity from each of the storage batteries, acquires power supply-demand prediction information showing a prediction of power supply and demand in a prescribed range from the energy management system, decides an individual charging-discharging rate for each of the storage batteries based on the storage battery information and the power supply-demand prediction information, and sends the decided individual charging-discharging rate to each of the storage batteries. Each of the storage batteries operates based on the individual charging-discharging rate received from the storage battery control apparatus.

## Claims

### Claim 1

A storage battery control system for controlling an operation of a storage battery coupled to a power grid, comprising:
multiple storage batteries disposed in a power grid; and
a storage battery control apparatus configured to control a charging and a discharging of the multiple storage batteries, and communicably coupled to the multiple storage batteries and an energy management system,
wherein the storage battery control apparatus is configured to:
acquire storage battery information comprising a charging-discharging performance and a remaining capacity from the storage batteries;
acquire power supply-demand prediction information showing a prediction of power supply and demand in a prescribed range from the energy management system, which manages the power supply and demand in the prescribed range;
determine, based on the power supply-demand prediction information received from the energy management system, whether a mode is a balanced mode in which a power demand and a power supply are in balance, a discharging performance priority mode in which the power demand is greater than the power supply, or a charging performance priority mode in which the power supply is greater than the power demand;
select, as a control pattern, in a case of the balanced mode, a balanced control pattern for deciding on the individual charging-discharging rate so as to allow the remaining capacity of each of the storage batteries to approach half of the full charge capacity of the relevant storage battery;
select, as the control pattern, in a case of the discharging performance priority mode, a discharging control pattern for deciding on the individual charging-discharging rate that allows charging from a low-discharging-performance storage battery of the storage batteries to a high-discharging-performance storage battery of the storage batteries; and
select, as the control pattern, in a case of the charging performance priority mode, a charging control pattern for deciding on the individual charging-discharging rate that allows charging from a high-charging-performance storage battery of the storage batteries to a low-charging-performance storage battery of the storage batteries
decide an individual charging-discharging rate for each of the storage batteries based on the control pattern; and
send the individual charging-discharging rate to each of the storage batteries, and
each of the storage batteries is configured to operate based on the individual charging-discharging rate received from the storage battery control apparatus.

### Claim 2 (depends on 1)

The storage battery control system according to claim 1, wherein the charging-discharging performance comprises a charging performance showing a charging rate per unit of time, a discharging performance showing a discharging rate per unit of time, and a full charge capacity.

### Claim 3 (depends on 2)

The storage battery control system according to claim 2, wherein:
the energy management system is configured to:
predict a power demand in the prescribed range in a prescribed time period, which is configured longer than the unit of time, based on a power consumption of a customer, who exists within the prescribed range; and
calculate a total charging-discharging rate requested for the storage batteries as a whole based on the predicted power demand, and
the energy management system includes the calculated total charging-discharging rate in the power supply-demand prediction information, and sends this information to the storage battery control apparatus.

### Claim 4 (depends on 3)

The storage battery control system according to claim 3, wherein the energy management system is configured to calculate load prediction information showing a trend of a change in the power demand based on the predicted power demand, and
the energy management system includes the calculated load prediction information in the power supply-demand prediction information, and sends this information to the storage battery control apparatus.

### Claim 5 (depends on 1)

The storage battery control system according to claim 1, wherein, in a case where there exists multiple candidates for the control pattern, the storage battery control apparatus is configured to select any one of the candidates as the control pattern based on a preconfigured prescribed selection criterion.

### Claim 6 (depends on 5)

The storage battery control system according to claim 5, wherein the prescribed selection criterion is used to select, from among the multiple candidates, a candidate having the shortest total value for a distance between a customer and the storage battery that supplies power to the customer.

### Claim 7 (depends on 5)

The storage battery control system according to claim 5, wherein the prescribed selection criterion is used to select, from among the multiple candidates, a candidate having the shortest total value for a time required for charging and discharging power.

### Claim 8 (depends on 1)

The storage battery control system according to claim 1, wherein the power supply and demand in the prescribed range is power supply and demand in a low voltage-side grid of a distribution substation.

### Claim 9 (depends on 1)

The storage battery control system according to claim 1, wherein the power supply and demand in the prescribed range is power supply and demand in a low voltage-side grid of a pole transformer.

### Claim 10 (depends on 1)

The storage battery control system according to claim 1, wherein the power supply and demand in the prescribed range is power supply and demand in electrical equipment of a customer.

### Claim 11 (depends on 1)

The storage battery control system according to claim 1, wherein the multiple storage batteries are respectively mounted in different electric vehicles.

### Claim 12

A storage battery control method for controlling an operation of a storage battery coupled to a power grid, comprising the steps, to be performed by a processor, of:
acquiring storage battery information comprising a charging-discharging performance and a remaining capacity from multiple storage batteries coupled to a power grid;
acquiring power supply-demand prediction information showing a prediction of power supply and demand in a prescribed range from an energy management system, which manages the power supply and demand in the prescribed range;
determining, based on the power supply-demand prediction information received from the energy management system, whether a mode is a balanced mode in which a power demand and a power supply are in balance, a discharging performance priority mode in which the power demand is greater than the power supply, or a charging performance priority mode in which the power supply is greater than the power demand;
selecting, as a control pattern, in a case of the balanced mode, a balanced control pattern for deciding on the individual charging-discharging rate so as to allow the remaining capacity of each of the storage batteries to approach half of the full charge capacity of the relevant storage battery;
selecting, as the control pattern, in a case of the discharging performance priority mode, a discharging control pattern for deciding on the individual charging-discharging rate that allows charging from a low-discharging-performance storage battery of the storage batteries to a high-discharging-performance storage battery of the storage batteries; and
selecting, as the control pattern, in a case of the charging performance priority mode, a charging control pattern for deciding on the individual charging-discharging rate that allows charging from a high-charging-performance storage battery of the storage batteries to a low-charging-performance storage battery of the storage batteries
deciding an individual charging-discharging rate for each of the storage batteries based on the control pattern;
sending the individual charging-discharging rate to each of the storage batteries; and
operating each of the storage batteries based on the individual charging-discharging rate received from a storage battery control apparatus.