JP2009105998A - Electrical storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical storage device that allows enhancement of the efficiency of electricity usage and prevent shortening of the lifetime of a storage battery. <P>SOLUTION: The electrical storage device 101 supplies commercial power from a commercial electric power system 61 to a load LD1 and includes a storage battery 2 that stores commercial power and supplies the stored power to the load LD1; an amount of stored power detection unit 3 that detects the amount of power stored in the storage battery 2 at predetermined time intervals; a switch SW1 that is connected in between the power system 61 and the storage battery 2 and switches whether commercial power is to be supplied to the storage battery 2; and a control unit 1. Commercial power is stored in the storage battery 2 by turning on the switch SW1. Based on the detected amount of power stored in the storage battery 2, the control unit switches whether the period for which the switch SW1 is turned on so that the amount of power stored in the storage battery 2 reaches the maximum power storage capacity of the storage battery 2, or so that the amount of power stored in the storage battery 2 becomes less than the maximum power storage capacity of the storage battery 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power storage device, and more particularly, to a power storage device having a function of storing commercial power supplied from a commercial power system and controlling the amount of stored commercial power.

As an example of a technique for supplying power from a private power generation device or a private power storage device to a load when supply of commercial power from a commercial power system stops, for example, Patent Document 1 discloses the following private power supply control. A system is disclosed. That is, the private power supply control system includes a private power generation device and a private power storage device. In a private power supply control system that supplies power from a private power generation device and private power storage device to electrical equipment in a consumer via a power control device at the time of a commercial power outage, commercial power is supplied to a device in a power company that supplies commercial power. The function of transmitting the information of the scheduled recovery time to the consumer by the communication line at the time of the power failure is provided, and the function of receiving the information from the device in the power company is provided in the power control device of the consumer. And at the time of a power failure of commercial power, a power control device selects an appropriate electrical device according to the received scheduled recovery time, and supplies power from the private power generation device and private power storage device. With such a configuration, it is possible to minimize adverse effects caused by power outages.
JP 2003-92844 A

  By the way, normally, in a storage battery, a power loss occurs during charging, and a power loss due to discharge occurs. For this reason, in the structure which charges a storage battery regularly to the maximum electrical storage capacity of a storage battery regularly, when the electric power of a storage battery remains at the time of the next charge, the use efficiency of electric power will worsen. Moreover, if the storage battery is charged to the maximum storage capacity of the storage battery, the life of the storage battery is shortened. However, the private power supply control system described in Patent Document 1 does not disclose a configuration for dealing with such a problem.

  Therefore, an object of the present invention is to provide a power storage device that can improve the use efficiency of electric power and prevent the life of the storage battery from being shortened.

  In order to solve the above-described problem, a power storage device according to an aspect of the present invention is a power storage device that supplies commercial power from a commercial power system to a load, stores the commercial power, and supplies the stored power to the load. A storage battery, a storage amount detection unit that detects the amount of power stored in the storage battery at a predetermined interval, a switch that is connected between the commercial power system and the storage battery, and switches whether or not the commercial power is supplied to the storage battery; By turning on the switch, commercial power is stored in the storage battery, and based on the detected storage amount of the storage battery, the period for turning on the switch is set so that the storage amount of the storage battery reaches the maximum storage capacity of the storage battery, or the storage battery And a control unit that switches whether to set a period for turning on the switch so that the amount of stored electricity is less than the maximum storage capacity of the storage battery.

  Preferably, when the detected storage amount of the storage battery is greater than a predetermined value, the control unit turns on the switch so that the storage amount of the storage battery is greater than or equal to the detected storage amount of the storage battery and less than the maximum storage capacity of the storage battery. Set the time period.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the utilization efficiency of electric power improves and the lifetime of a storage battery becomes short.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a power supply system according to an embodiment of the present invention.

  Referring to FIG. 1, power supply system 201 includes a commercial power system 61, a watt hour meter 51, a breaker 52, and a power storage device 101.

The watt-hour meter 51 measures commercial power supplied from the commercial power grid 61 to the home.
The power storage device 101 supplies the commercial power supplied from the commercial power system 61 to household appliances such as a microwave oven, a refrigerator, a washing machine, lighting, an air conditioner, and a water heater.

  The breaker 52 is connected between the watt-hour meter 51 and the power storage device 101, and is turned off when the power consumption of each household electrical appliance in the home exceeds a predetermined value. Shut off the power supply to

FIG. 2 is a diagram showing in detail the configuration of the power storage device according to the embodiment of the present invention.
Referring to FIG. 2, power storage device 101 includes control unit 1, storage battery 2, storage amount detection unit 3, and switches SW <b> 1 and SW <b> 2.

  The storage battery 2 stores the commercial power supplied from the commercial power system 61 and supplies the stored power to the home appliance LD1.

  The power storage amount detection unit 3 detects the amount of power stored in the storage battery 2 and outputs a signal indicating the detected power amount to the control unit 1. The storage amount detection unit 3 may be configured to detect the discharge amount of the storage battery 2 and calculate the storage amount of the storage battery 2 from the detected discharge amount.

  The switch SW1 is connected between the breaker 52 and the storage battery 2, and switches whether or not the commercial power from the commercial power system 61 is supplied to the storage battery 2.

  The switch SW2 is connected between the storage battery 2 and the home appliance LD1, and switches whether or not the electric power stored in the storage battery 2 is supplied to the home appliance LD1.

  Control unit 1 turns on or off switch SW <b> 1 based on the state of charge of storage battery 2. Moreover, the control part 1 turns on or off switch SW2 based on the power consumption of household appliances LD1.

[Operation]
Next, an operation when the power storage device according to the embodiment of the present invention charges commercial power will be described.

  The controller 1 turns on the switch SW2 and turns off the switch SW1 during the daytime. Then, the commercial power from the commercial power system 61 and the power from the storage battery 2 are supplied to the home appliance LD1. Thereby, the usage-amount of the commercial power from the commercial power system 61 can be reduced, and an electricity bill can be saved.

  The control unit 1 turns on the switch SW1 and turns off the switch SW2 at night. Thereby, the commercial power from the commercial power system 61 is stored in the storage battery 2.

  The control unit 1 receives a signal indicating the storage amount of the storage battery 2 from the storage amount detection unit 3, and decreases the target storage amount when the remaining storage amount of the storage battery 2 is large at a predetermined time, for example, 11:00 pm every day. Increase the target power storage amount. The storage amount detection unit 3 may output a signal indicating the remaining storage amount of the storage battery 2 to the control unit 1 at least 11:00 pm every day.

  More specifically, when the remaining amount of electricity stored in the storage battery 2 at 01:00 pm is 0, the control unit 1 turns on the switch SW1 so that the storage amount of the storage battery 2 reaches the maximum storage capacity, that is, the storage battery 2 Set the charging period.

  In addition, when the remaining amount of power stored in the storage battery 2 at 11 pm is 10% or less of the maximum storage capacity, the control unit 1 sets target storage amount = target storage amount set on the previous day + (maximum storage capacity of the storage battery 2 10%). And the control part 1 sets the period which turns on switch SW1 so that the electrical storage amount of the storage battery 2 may become a target electrical storage amount. Note that the control unit 1 sets the target power storage amount to the maximum power storage capacity when the target power storage amount of the storage battery 2 exceeds the maximum power storage capacity.

  The control unit 1 sets the target power storage amount to be the same as the previous day when the remaining power storage amount of the storage battery 2 at 11 pm is greater than 10% of the maximum power storage capacity and 30% or less.

  Further, the control unit 1 determines that the target storage amount = the target storage amount set on the previous day−the storage battery 2 when the remaining storage amount of the storage battery 2 at 11 pm is greater than 30% of the maximum storage capacity and 50% or less. The remaining amount of electricity is / 4. And the control part 1 sets the period which turns on switch SW1 so that the electrical storage amount of the storage battery 2 may become a target electrical storage amount. Note that when the target storage amount is less than 40% of the maximum storage capacity of the storage battery 2, the control unit 1 sets the target storage amount to 40% of the maximum storage capacity.

  In addition, when the remaining amount of storage battery 2 is greater than 50% of the maximum storage capacity at 11:00 pm, control unit 1 sets target storage amount = target storage amount set on the previous day−remaining storage amount of storage battery / 2. And And the control part 1 sets the period which turns on switch SW1 so that the electrical storage amount of the storage battery 2 may become a target electrical storage amount. Note that when the target storage amount is less than 40% of the maximum storage capacity of the storage battery 2, the control unit 1 sets the target storage amount to 40% of the maximum storage capacity.

  That is, when the storage amount of the storage battery 2 at 11:00 pm is greater than 30% (predetermined value) of the maximum storage capacity, the control unit 1 determines that the storage amount of the storage battery 2 is greater than or equal to the storage amount of the storage battery 2 at 11:00 pm The period during which the switch SW1 is turned on is set so as to be less than the maximum storage capacity of the storage battery 2.

  When the target storage amount is equal to or less than the remaining storage amount of the storage battery 2 at 11:00 pm, the control unit 1 turns off the switch SW1 until 11:00 pm on the next day.

  By the way, in the structure which charges a storage battery regularly to the maximum electrical storage capacity of a storage battery regularly, when the electric power of the storage battery was surplus at the time of the next charge, there existed a problem that the use efficiency of electric power worsened. In addition, there is a problem that if the storage battery is charged up to the maximum storage capacity of the storage battery, the life of the storage battery is shortened. However, in the power storage device according to the embodiment of the present invention, the control unit 1 stores the commercial power in the storage battery 2 by turning on the switch SW1, for example, based on the storage amount of the storage battery 2 at 11 pm Of the period up to 11:00 pm, the period for turning on the switch SW1 is determined. That is, the control unit 1 sets a period for turning on the switch SW <b> 1 so that the storage amount of the storage battery 2 reaches the maximum storage capacity of the storage battery 2 based on the storage amount of the storage battery 2, or the storage amount of the storage battery 2 is Whether to set the period for turning on the switch SW1 is switched so as to be less than the maximum storage capacity of the storage battery 2.

  Thus, by appropriately setting the amount of charge of the storage battery 2 based on the remaining amount of power stored in the storage battery 2, it is possible to reduce power loss during charging of the storage battery 2 and power loss due to discharge.

  Therefore, in the power storage device according to the embodiment of the present invention, it is possible to improve the power use efficiency and prevent the life of the storage battery from being shortened.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the electric power supply system which concerns on embodiment of this invention. It is a figure which shows the structure of the electrical storage apparatus which concerns on embodiment of this invention in detail.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Control part, 2 Storage battery, 3 Electric power storage amount detection part, 51 Electric energy meter, 52 Breaker, 61 Commercial power system, 101 Electric power storage apparatus, 201 Electric power supply system, SW1, SW2 switch, LD1 Home appliances.

Claims (2)

A power storage device for supplying commercial power from a commercial power system to a load,
A storage battery for storing the commercial power and supplying the stored power to the load;
A storage amount detection unit for detecting the amount of power stored in the storage battery at predetermined intervals;
A switch connected between the commercial power system and the storage battery, for switching whether or not the commercial power is supplied to the storage battery;
The commercial power is stored in the storage battery by turning on the switch, and the switch is turned on so that the storage amount of the storage battery reaches the maximum storage capacity of the storage battery based on the detected storage amount of the storage battery. Or a control unit that switches whether to set a period for turning on the switch so that a storage amount of the storage battery is less than a maximum storage capacity of the storage battery.   When the detected storage amount of the storage battery is greater than a predetermined value, the control unit causes the storage amount of the storage battery to be equal to or greater than the detected storage amount of the storage battery and less than the maximum storage capacity of the storage battery. The power storage device according to claim 1, wherein a period during which the switch is turned on is set.

Images