JP2012083041A - Hot water storage unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that, since heat is generated during charging and discharging when a storage battery is used, a resulting high-temperature state makes the storage battery short in lifetime, and heat generation accompanied by the charging and discharging of the storage battery is a waste of energy.SOLUTION: A hot water storage unit includes a storage battery 101 which is charged with electric power and discharges electric power, an electric power connection means 102 of supplying the electric power of the storage battery 101, a hot water storage tank 103 which stores hot water, a water supply pipe 104 which supplies water to the hot water storage tank 103, a heat exchange means 105 of making heat generated by the storage battery 101 conductive to water in the water supply pipe 104, and a water supply valve 106 which controls water supply from the water supply pipe 104 to the hot water storage tank 103. The hot water storage unit suppresses a rise in temperature accompanied by the charging and discharging of the storage battery 101 and warms the water to be supplied.

Description

  The present invention stores power generated using commercial power sources such as nighttime power or solar / wind / fuel cells, and discharges and uses the stored power during the daytime or when there is a power outage. Thus, the present invention relates to a hot water storage unit including a storage battery that can use the power generated efficiently. Here, the hot water storage unit is a hot pump water heater (also called Eco Cute), a household fuel cell cogeneration system (also called ENE-FARM), an electric water heater, a solar water heater, etc. This is a device for temporarily storing hot water until the user uses it in a hot water supply or a bath.

  Conventionally, as this type of device, for example, as shown in Patent Document 1, a storage battery is provided as a hot water supply system, and power is charged in a midnight power time zone, discharged in another time zone such as daytime, and supplied to a heat pump unit. By doing so, it has been proposed to level the power consumption.

JP 2010-7952 A

  However, the hot water supply system of Patent Document 1 having the conventional configuration has not been considered much about the heat generated when charging and discharging the storage battery and the use of the storage battery at high or low temperatures.

  In general, rechargeable storage batteries (also called secondary batteries) such as lithium ion batteries, nickel metal hydride batteries, and lead batteries generate heat during charging and discharging, and are in a high temperature state due to continued charging and discharging in the heated state. The deterioration of the storage battery due to the use of the battery is the cause of shortening the life of the storage battery, and reducing the deterioration of the storage battery, which is an expensive part, is one of the very important issues. In addition, since the charging and discharging operation of the storage battery involves a chemical reaction, it is necessary to be in an appropriate temperature range in which the chemical substance to be used can react, and when the temperature becomes too low, the electrical conductivity of the electrolytic solution decreases rapidly, There has been a problem that the conventional performance cannot be exhibited, for example, the charging and discharging performance is deteriorated.

  In order to solve the conventional problem, the hot water storage unit of the present invention is connected to a storage battery that charges and discharges power, a power load and a power supply source, and power connection means that uses and supplies power of the storage battery, A hot water storage tank for storing hot water, a water supply pipe for supplying water from a commercial water tap to the hot water storage tank, heat exchange means for transferring heat generated from the storage battery to water in the water supply pipe, and from the water supply pipe to the hot water storage tank A water supply valve for adjusting the water supply is provided.

  The hot water storage unit of the present invention transmits heat generated during charging / discharging of the storage battery to the water supplied to the hot water storage tank by heat exchange means, thereby suppressing the rise in the temperature of the storage battery and using the storage battery at a high temperature. Reduce degradation. Furthermore, since this water can be heated by transferring the heat generated from the storage battery to the water supplied to the hot water storage tank by the heat exchange means, the energy as heat can be used effectively.

The figure of the structural example of the hot water storage unit of Embodiment 1. The figure of the structural example of the hot water storage unit of Embodiment 1. The figure of the structural example of the hot water storage unit of Embodiment 2. Flowchart of the second embodiment The figure of the structural example of the hot water storage unit of Embodiment 3. Flowchart of the third embodiment The figure of the structural example of the hot water storage unit of Embodiment 4. Flowchart of the fourth embodiment The figure of the structural example of the hot water storage unit of Embodiment 5. Flowchart of the fifth embodiment The figure of the structural example of the hot water storage unit of Embodiment 6. The figure of the structural example of the hot water storage unit of Embodiment 7.

  A first invention is a storage battery for charging / discharging electric power, an electric power connection means connected to an electric power load and a power supply source, and uses and supplies electric power of the storage battery, a hot water storage tank for storing hot water, and a commercial water tap Water supply pipe that supplies water to the hot water storage tank, heat exchange means that transfers heat generated from the storage battery to the water in the water supply pipe, and a water supply valve that adjusts the water supply from the water supply pipe to the hot water storage tank. By transmitting the heat to be supplied to the water supplied to the hot water storage tank by the heat exchange means, it is possible to reduce deterioration of the storage battery due to heat generation and use at a high temperature by suppressing the temperature rise of the storage battery. Furthermore, since this water can be heated by transmitting the heat generated from the storage battery to the water supplied to the hot water storage tank by the heat exchanging means, the energy as heat can be used effectively.

  According to the second aspect of the invention, in particular, the storage battery of the first aspect of the invention can be arranged at a position lower than the hot water storage tank, thereby reducing the influence of heat generation of the hot water storage tank.

  In particular, in addition to the first or second invention, the third invention is a power supply detection means for detecting water supply from the water supply valve to the hot water storage unit, and a power load for operating a power load such as a heat pump unit or a heater. Control means, and when the water supply is detected by the water supply detection means, the power of the storage battery is used by the power load control means, so that the heat generated by the discharge when using the power of the storage battery is Since the heat of the storage battery can be transmitted to the water at the time of water supply by transmitting to the water supplied to the hot water storage tank by the exchange means, the heat generated by the storage battery can be used effectively. Further, by suppressing the temperature rise of the storage battery, it is possible to reduce the deterioration of the storage battery due to heat generation and use at a high temperature.

  In addition to any one of the first to third inventions, the fourth invention is a water supply detection means for detecting water supply from the water supply valve to the hot water storage unit, and power generated by, for example, a commercial power source or a fuel cell unit. Power supply control means for supplying the storage battery to the storage battery, and when the water supply detection means detects water supply, the storage battery is charged by the power supply control means, so that the heat generated during charging of the storage battery is By transmitting to the water supplied to the hot water storage tank by the exchange means, the heat generated by the storage battery can be used effectively. Further, by suppressing the temperature rise of the storage battery, it is possible to reduce the deterioration of the storage battery due to heat generation and use at a high temperature.

In addition to any one of the first to fourth inventions, the fifth aspect of the invention is a storage battery discharge detection means for detecting use of the power of the storage battery by means of a power load such as a heat pump unit or a heater from the power connection means. Water supply valve control means for controlling the opening and closing of the water supply valve, and when the storage battery discharge detection means detects discharge of the storage battery, the water supply valve control means opens the water supply valve to supply water to the hot water storage tank. Since the heat generated by the discharge of the storage battery can be transmitted to the water at the time of water supply by supplying the heat, the heat generated by the storage battery can be effectively used. Further, by suppressing the temperature rise of the storage battery, it is possible to reduce the deterioration of the storage battery due to heat generation and use at a high temperature.

  In addition to any one of the first to fifth inventions, the sixth aspect of the invention is a storage battery charging for detecting a state in which the storage battery is charged with electric power from, for example, a commercial power source or a fuel cell unit from the power connection means. A water supply valve control means for controlling opening and closing of the water supply valve, and when the storage battery charge detection means detects charging of the storage battery, the water supply valve control means opens the water supply valve to the hot water storage tank. By supplying water, the heat generated by charging the storage battery can be transferred to the water at the time of water supply, so that the heat generated by the storage battery can be used effectively. Further, by suppressing the temperature rise of the storage battery, it is possible to reduce the deterioration of the storage battery due to heat generation and use at a high temperature.

  According to a seventh invention, in addition to any one of the first to sixth inventions, in particular, the water supply pipe supplies water to the hot water storage tank without passing through the heat exchange means, the avoidance path, and the heat. When the temperature of the water supplied by the water temperature detecting means is lower than a predetermined temperature by providing a switching valve for switching a water supply path through the exchange means and a water temperature detecting means for detecting the temperature of the water to be supplied, By switching the water supply path to the switching valve and supplying water to the hot water storage tank without passing through the heat exchanging means, it is possible to reduce the influence due to the temperature drop of the storage battery.

  In addition to any one of the first to seventh inventions, the eighth invention provides a heat storage material at a place where the storage battery is installed, and absorbs heat generated by the storage battery, thereby causing a rapid temperature change. It is possible to prevent and reduce deterioration due to use under high temperature.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the present embodiment.

(Embodiment 1)
The hot water storage unit in the present embodiment will be described with reference to FIG.

  FIG. 1 shows a configuration of a hot water storage unit 100 according to Embodiment 1 of the present invention.

  The hot water storage unit 100 is connected to a storage battery 101 that charges and discharges power, a device that uses power such as a heat pump unit that is a power load, a commercial power source that is a power supply source, a fuel cell unit, and the like. Power connection means 102 for using and supplying electric power, a hot water storage tank 103 for storing hot water, a water supply pipe 104 for supplying water from a commercial water tap to the hot water storage tank 103, and heat generated from the storage battery 101 is transmitted to the water in the water supply pipe. The heat exchange means 105 and the water supply valve 106 which adjusts the water supply from the water supply pipe 104 to the hot water storage tank 103 are provided. With this configuration, the heat generated during charging / discharging of the storage battery is transmitted to the water supplied to the hot water storage tank 103 by the heat exchange means 105, thereby suppressing the temperature rise of the storage battery 101, thereby generating heat and Deterioration due to use at high temperatures can be reduced. Furthermore, since the water supplied to the hot water storage tank 103 is warmed by the heat of the storage battery 101, it can be used effectively without throwing away the heat generated from the storage battery 101.

  Next, each component of the hot water storage unit 100 will be described. In the hot water storage unit 100 of FIG. 1, the hot water storage unit illustrates an example configuration in which a water tap, a commercial power source, and a heat pump unit are connected.

The storage battery 101 stores power generated by using commercial power sources such as nighttime power or solar power / fuel cells / wind power, etc., and stored it during the daytime when electricity demand is high or when the electricity bill is high or during power outages. It is a household storage battery that discharges and uses electric power, and is a storage battery (also referred to as a secondary battery) that can be charged and discharged, such as a lithium ion battery, a nickel hydride battery, and a lead storage battery. As applications, it can be used as a power source for smoothing power demand, reducing electricity bills, and emergency power during power outages. In general, rechargeable storage batteries such as lithium ion batteries, nickel metal hydride batteries, and lead batteries generate heat during charging and discharging, and if used in a high temperature state due to continued charging and discharging, they are affected by heat. Deterioration of the storage battery is likely to proceed, and there is a risk of electrolyte leakage. In addition, the charging / discharging operation of the storage battery needs to be within an appropriate temperature range in which the chemical substance to be used can react. If the temperature is too low, the electrical conductivity rapidly decreases and the conventional performance can be exhibited. become unable. For this reason, it is necessary to make it the range of use temperature according to the characteristic of the storage battery to be used. For example, in the case of a lithium ion battery using a general electrolytic solution, it is often necessary to set the temperature to 0 ° C. to 40 ° C.

  By using the storage battery 101, for example, when the storage battery is charged with nighttime power and the temperature of the hot water storage unit falls during the hot water usage time such as in the evening, the power of the hot water storage unit is used by using the power of the storage battery. By heating the hot water, it becomes possible to increase the amount of hot water used during the hours of use at a low cost for night electricity. In addition, by making it possible to increase boiling, it is possible to lower the set temperature of hot water to be heated at night and to reduce the heat loss in which the heat of the hot water stored in the hot water storage tank escapes from the hot water storage unit. It becomes like this. In addition, since boiling can be increased during use hours, the amount of hot water to be stored can be reduced and the hot water storage tank can be downsized. For example, if the system uses heat energy from the atmosphere, such as a heat pump unit, the hot water in the hot water storage tank is boiled at a low outdoor temperature, allowing you to use cheaper nighttime electricity bills and daytime air. The hot water in the hot water storage tank can be efficiently boiled using the thermal energy of

  The power connection means 102 is connected to a power load and a power supply source to use and supply the power of the storage battery 101. For example, the power connection means 102 is an electric wire or power cord that uses and supplies the power of the storage battery 101. Any configuration may be used as long as it can transmit the power to the power load and transmit the power from the power supply source to the storage battery 101.

  Here, the power load is mainly the heat pump unit in the hot water storage tank 103 such as a heat pump unit that compresses the air by a compressor to recover the heat of the air and warms the hot water, or an electric water heater that warms the hot water by Joule heat. It is a device for warming hot water. Further, as other electric power loads, it is possible to configure even an electric circuit inside the hot water storage tank, an electric circuit of the fuel cell unit, or a general electric appliance used for purposes other than warming hot water. .

  In addition, as a merit by using the heat pump unit that warms the hot water in the hot water storage tank 103 and the hot water storage unit 100, for example, when the hot water storage unit 100 is supplied with water, the temperature of the hot water in the hot water storage tank 103 is lowered. By moving the heat pump unit, the temperature of the hot water in the hot water storage tank 103 is prevented from lowering, and the heat generated by the use of the storage battery 101 can be transmitted to the water supplied to the hot water storage unit. When the heat pump unit and the hot water storage unit are combined, by moving the heat pump during the water supply, while warming the hot water whose temperature has decreased due to the water supply, the temperature of the storage battery 101 is prevented from rising, and the water supply water is further heated. be able to.

Further, the power supply source is power generated by a commercial power source or a fuel cell unit or power generated by a solar panel, and can be selected depending on the system configuration of the hot water storage unit 100. For example, when combined with a fuel cell unit that generates electricity at the same time as warming hot water, a configuration example as shown in FIG. 2 is obtained, and the power connection means 102 connects the power output unit of the fuel cell unit that generates power and the storage battery 101 to be charged. To do. In addition, by connecting the power source of the fuel cell unit and the storage battery 101, the power of the storage battery 101 can be used as the power for operating the fuel cell unit. By supplying electric power from the storage battery 101, the fuel cell unit can be configured to operate even during a power failure.

  The hot water storage tank 103 is a tank for storing general hot water for home use. The hot water storage tank 103 is composed of a water channel that exchanges hot water with a device that warms hot water, such as water supply from a water tap, a water supply pipe to a household that uses hot water, and a heat pump unit. Desirably, the hot water storage tank 103 is surrounded by a material having low heat conductivity and high heat insulating performance so as to be waterproof, water resistant, and heat insulating, and to prevent the hot water temperature from being lowered.

  The water supply pipe 104 is a water channel for water supply that is connected to a hot water storage tank 103 from a commercial water tap such as a water station.

  The heat exchanging means 105 is a heat exchanging device for exchanging heat for transferring heat generated during the heat generation of the storage battery 101 to the water in the water supply pipe 104 in the middle of the water supply pipe 104 connecting the hot water storage tank 103 to the water tap. It is. For example, as shown in the diagram of the heat exchanging means 105 in FIG. 1, in the middle of the water supply pipe 104, the surface of the storage battery 101 is repeatedly reciprocated so as to increase the time of contact during water supply. Thus, heat exchange between the heat generated by the storage battery 101 and the water flowing during water supply can be performed. Further, for example, an aluminum hollow pipe having high thermal conductivity is arranged so as to be repeatedly wound around the storage battery 101, and the water supply pipe 104 in the middle of the water tap and the hot water storage tank 103 is connected to the aluminum hollow pipe. Thus, by configuring the pipe to pass water, when the storage battery 101 is dissipating heat, the water being supplied passes through the storage battery 101 so that heat can be taken away. . In addition, many configurations related to a heat exchange device related to the heat exchange of water passing through the heat generating portion and the pipe have been proposed, and any configuration that can transmit the heat generated by the storage battery 101 to the water in the water supply pipe 104 is possible. Any configuration may be used.

  The water supply valve 106 is a valve for adjusting the supply of water from the water tap. Water is supplied to the hot water storage tank 103 by opening the water supply valve. The timing of water supply is configured according to the system to be used. For example, when water is automatically supplied for the amount of hot water stored in the hot water storage tank 103, a float switch can be provided in the hot water storage tank and the water supply valve 106 can be opened and closed in conjunction with the float switch. . In addition, a float switch is a switch of the structure in which the float which floats using the force of buoyancy turns on when the water surface falls. When the amount of the hot water storage tank drops below a predetermined value or when water is supplied at a predetermined timing such as a specific time, the water supply valve 106 is electromagnetic and a control means such as a microcomputer is provided at the predetermined timing. Configure to control.

  With this configuration, heat generated during charging / discharging of the storage battery 101 is transmitted to the water supplied to the hot water storage tank 103 by the heat exchanging means 105, thereby suppressing the temperature rise of the storage battery 101 and generating heat of the storage battery 101. In addition, deterioration due to use at a high temperature can be reduced. Furthermore, since the water supplied to the hot water storage tank 103 is warmed by the heat of the storage battery 101, it can be used effectively without throwing away the heat generated from the storage battery 101.

In addition, since the storage battery 101 is disposed at a position lower than the hot water storage tank 103, the heat of the hot water stored in the hot water storage tank rises mainly upward to increase the influence. For example, as shown in FIG. By arranging the hot water storage tank 103 under the hot water storage tank 103, the influence of heat generated in the hot water storage tank 103 can be reduced. In addition, as shown in FIG. 1, if the water supply from the water tap to the hot water storage tank 103 is performed from the lower part of the hot water storage tank 103, the storage battery 101 is disposed in the hot water storage tank 103, thereby Since the water is supplied to the hot water storage tank 103 through the heat exchanging means 105, it is possible to configure the water supply pipe 104 without greatly routing the water channel.

(Embodiment 2)
The invention of the present embodiment will be described with reference to the configuration example of the hot water storage unit 300 that controls the power load during water supply in FIG. 3 and the flowchart of the hot water storage unit 300 that controls the power load during water supply in FIG.

  The hot water storage unit 300 includes a storage battery 101 that charges and discharges power, a power connection means 102 that uses and supplies the power of the storage battery 101, a hot water storage tank 103 that stores hot water, and a water supply that supplies water from a commercial water tap to the hot water storage tank 103. A heat exchange means 105 for transferring heat generated from the pipe 104, the storage battery 101 to the water in the water supply pipe 104, a water supply valve 106 for adjusting water supply from the water supply pipe 104 to the hot water storage tank 103, and a hot water storage tank 103 from the water supply valve 106. A water supply detection means 307 for detecting water supply to the power supply and a power load control means 308 for operating a power load such as a heater of a heat pump unit or an electric water heater, for example.

  Here, the storage battery 101, the power connection means 102, the hot water storage tank 103, the water supply pipe 104, the heat exchange means 105, and the water supply valve 106 are the same as the configuration of the hot water storage unit 100 described above.

  The water supply detection means 307 is a device that detects water supply from the water tap to the hot water storage tank 103. For example, a flow meter that measures the amount of water flowing in the water supply pipe 104, a water level meter that measures a change in the water level of the hot water storage tank 103, and an open / close detection switch that detects the open / close state of the water supply valve 106. Thus, the state of water supply can be detected.

  The power load control means 308 is a device that controls a power load such as a heat pump unit or a heater of an electric water heater, and is electrically connected to the heat pump unit or the electric water heater or by wireless communication such as radio waves or infrared light. The control circuit performs control such as operation and stop of the power load by notifying the control signal.

  Next, the flow of operation of the hot water storage unit 300 that controls the power load during water supply will be described with reference to FIG. In step S401, the state of water supply is detected by the water supply detection means 307. Next, in step S402, depending on the detection state in step S401, if the water is being supplied, the operation proceeds to step S403, and if not, the operation is transferred to step S404. In step S404, the operation of driving is notified from the power load control means 308 to the power load. For example, an instruction to start the operation of the heat pump unit or the like is given by sending a predetermined operation start electric signal from the power load control means 308. In step S404, the power load control means 308 notifies the power load of the stop of operation. For example, an instruction to stop the operation of the heat pump unit or the like is issued by sending a predetermined operation stop electric signal from the power load control means 308. In addition, even if the change of the operation | movement by the start or stop of operation | movement of an electric power load is repeated in a short time like the heater of an electric water heater, if it is a system with little influence, a structure like this flowchart may be sufficient. However, in devices such as heat pump unit compressors that take time to start and stop and start-up energy is generated at the start of operation, an instruction to start operation is given after the water supply time has exceeded a certain time, or a water supply stop is more than a certain value. It is desirable that an instruction to stop operation is given after the lapse of time, and it is desirable to instruct the electric power load so that the operation operation is continuously performed with a reduced number of start and stop operations.

With this configuration, when water supply is detected by the water supply detection unit 307, the power of the storage battery 101 is used by using the power of the storage battery 101 from the power connection unit 102 by the power load control unit 308. The heat generated during the discharge is transmitted to the water supplied to the hot water storage tank 103 by the heat exchanging means 105, so that the heat of the storage battery 101 can be transmitted to the water at the time of water supply. It can be used effectively. In addition, by suppressing the temperature rise of the storage battery 101, it is possible to reduce deterioration of the storage battery 101 due to heat generation and use at a high temperature.

  The intention of moving the electric power load at the time of water supply is the timing at which the temperature of hot water in the hot water storage tank 103 is lowered when water is first supplied to the hot water storage unit 100. By moving the heat pump unit, for example, during the water supply in accordance with this timing, it is possible to prevent the temperature of the hot water in the hot water storage tank 103 from decreasing. Secondly, the heat generated by the use of the storage battery 101 is transmitted to the water by the heat exchanging means 105 and supplied to the hot water storage tank 103, whereby heat energy can be added to the water at the time of water supply. Thirdly, deterioration due to heat generation of the storage battery 101 can be reduced by preventing the temperature increase of the storage battery 101. As described above, a plurality of effects can be obtained simultaneously.

(Embodiment 3)
The invention of the present embodiment will be described with reference to a configuration example of a hot water storage unit 500 that charges a storage battery during water supply in FIG. 5 and a flowchart of the hot water storage unit 500 that controls an electric power load during water supply in FIG.

  The hot water storage unit 500 includes a storage battery 101 that charges and discharges power, a power connection means 102 that uses and supplies the power of the storage battery 101, a hot water storage tank 103 that stores hot water, and a water supply that supplies water from a commercial water tap to the hot water storage tank 103. A heat exchange means 105 for transferring heat generated from the pipe 104, the storage battery 101 to the water in the water supply pipe 104, a water supply valve 106 for adjusting water supply from the water supply pipe 104 to the hot water storage tank 103, and a hot water storage tank 103 from the water supply valve 106. A water supply detection means 507 for detecting water supply to the battery and a power supply control means 508 for supplying the storage battery 101 with power generated by, for example, a commercial power source or a fuel cell unit.

  Here, the storage battery 101, the power connection means 102, the hot water storage tank 103, the water supply pipe 104, the heat exchange means 105, and the water supply valve 106 are the same as the configuration of the hot water storage unit 100 described above.

  Further, the water supply detection means 507 is the same as the water supply detection means 307 described above.

  The power supply control unit 508 is a device that controls a device that supplies power, such as a commercial power source or a fuel cell unit. For example, in order to supply power from the commercial power source to the storage battery 101, control of energization by a relay, a power transistor, or the like. It is an electric circuit which performs. In addition, the control circuit performs control such as operation and stop of power supply by notifying a device such as a fuel cell unit of a control signal.

Next, the flow of operation of the hot water storage unit 500 that charges the storage battery during water supply will be described with reference to FIG. In step S601, the state of water supply is detected by the water supply detection means 507. Next, in step S602, the operation proceeds to step S603 if the water is being supplied depending on the detection state in step S601, and the operation is transferred to step S604 if the water is not being supplied. In step S604, the power supply control unit 508 notifies the power supply source of the power supply operation. For example, by sending a predetermined power supply start electric signal from the power supply control means 508, the operation of the fuel cell unit is started to generate power. In step S604, the power supply control unit 508 notifies the power supply source of the stop of power supply. For example, by sending an electric signal for stopping power supply determined in advance from the power supply control means 508, an instruction is given to stop the operation of the fuel cell unit and stop the power supply. Note that the configuration shown in this flowchart may be used as long as the system has little influence even if a change in operation due to the start or stop of power supply is repeated in a short time like a commercial power supply. However, in a system that takes time to start and stop operation, such as a fuel cell unit, and when startup energy is generated at the start of operation, an instruction to start operation is given after the water supply time has exceeded a certain time, or the water supply stoppage is constant. It is desirable that an instruction to stop operation is given after the above-described operation, and it is desirable to instruct the power supply source to continuously operate while reducing the number of start and stop operations.

  With this configuration, when water supply is detected by the water supply detection means 507, the power supply control means 508 charges the storage battery 101 from the power connection means 102, thereby generating heat generated when the storage battery 101 is charged. By transmitting the heat supplied to the hot water storage tank 103 by the heat exchange means 105, the heat of the storage battery 101 can be transmitted to the water at the time of water supply, so the heat generated by the storage battery 101 can be used effectively. It becomes like this. In addition, by suppressing the temperature rise of the storage battery 101, it is possible to reduce deterioration of the storage battery 101 due to heat generation and use at a high temperature.

  The intention of charging the storage battery 101 by supplying power at the time of water supply is the timing when the temperature of the hot water in the hot water storage tank 103 is lowered when the hot water storage unit 100 is supplied with water. By moving, for example, the fuel cell unit during the water supply in accordance with this timing, it is possible to prevent the temperature of the hot water in the hot water storage tank 103 from decreasing. Secondly, the heat generated by charging the storage battery 101 is transmitted to the water by the heat exchanging means 105 and supplied to the hot water storage tank 103, whereby heat energy can be added to the supplied water. Thirdly, deterioration due to heat generation of the storage battery 101 can be reduced by preventing the temperature increase of the storage battery 101. As described above, a plurality of effects can be obtained simultaneously.

(Embodiment 4)
The invention of the present embodiment will be described with reference to the configuration example of the hot water storage unit 700 that supplies water when using the power load in FIG. 7 and the flowchart of the hot water storage unit 700 that supplies water when using the power load in FIG.

  The hot water storage unit 700 includes a storage battery 101 that charges and discharges power, a power connection means 102 that uses and supplies the power of the storage battery 101, a hot water storage tank 103 that stores hot water, and a water supply that supplies water from a commercial water tap to the hot water storage tank 103. A heat exchange means 105 that transfers heat generated from the pipe 104, the storage battery 101 to the water in the water supply pipe 104, a water supply valve 106 that adjusts water supply from the water supply pipe 104 to the hot water storage tank 103, and a power connection means 102, for example, a heat pump A storage battery discharge detection unit 707 that detects use of the power of the storage battery 101 by a power load such as a unit or a heater, and a water supply valve control unit 708 that controls opening and closing of the water supply valve 106 are provided.

  Here, the storage battery 101, the power connection means 102, the hot water storage tank 103, the water supply pipe 104, the heat exchange means 105, and the water supply valve 106 are the same as the configuration of the hot water storage unit 100 described above.

  The storage battery discharge detection means 707 is a current sensor that detects the use of power of the storage battery 101, for example, a magnetic field induced around the current path of the power connection means 102. Current sensors include a structure in which a magnetic core and a meter are combined, a current transformer structure in which a coil is wound around the magnetic core, and a magnetoelectric conversion element such as a Hall element disposed in a gap in the magnetic core. Select according to the amount of power used by the load and the flowing current such as DC or AC.

  The water supply valve control means 708 is a control circuit for electrically controlling the opening and closing of the water supply valve 106. By using the water supply valve 106 as an electromagnetic valve, water supply is controlled by notifying the water supply valve 106 of a control signal. Any configuration may be used as long as it can control the water supply valve at a desired timing.

  Next, the flow of operation of the hot water storage unit 700 that supplies water when using an electric load will be described with reference to FIG. In step S <b> 801, the storage battery discharge detection unit 707 detects use of the power of the storage battery 101. In step S802, when the storage battery 101 is used, the operation is shifted to step S803, and when the storage battery 101 is not used, the operation is shifted to step S804. In step S803, the water supply valve control means 708 opens the water supply valve 106 to supply water to the hot water storage tank 103 through the heat exchange means 105. In step S804, the water supply valve control means 708 closes the water supply valve 106 to stop water supply. In addition, since the heat_generation | fever of the storage battery 101 decreases when the power consumption of the storage battery 101 is small, the effect by implementing this operation | movement also decreases. For this reason, it is desirable to adjust the operation threshold according to the configuration of the system, for example, by supplying water with the water supply valve control means 708 when the power usage value of the power load exceeds a predetermined magnitude such as 100 W or more.

  With this configuration, when the discharge of the storage battery is detected by the storage battery discharge detection means 707, the water supply valve control means 708 opens the water supply valve and supplies water to the hot water storage tank 103, whereby the storage battery 101 Since the heat generated by the discharge can be transmitted to the water at the time of water supply, the heat generated by the storage battery 101 can be used effectively. In addition, by suppressing the temperature rise of the storage battery 101, it is possible to reduce deterioration of the storage battery 101 due to heat generation and use at a high temperature.

  The intent to supply water when using the storage battery 101 is, for example, a power load that has little relevance to a hot water storage unit such as an air conditioner and is operated with the power of the storage battery 101 at a timing that matches the usage status of the power load. By supplying water to the unit 700, the deterioration of the storage battery 101 is reduced and the heat generated by the storage battery 101 is used.

(Embodiment 5)
The invention of the present embodiment will be described with reference to a configuration example of a hot water storage unit 900 that supplies water when the storage battery is charged in FIG. 9 and a flowchart of the hot water storage unit 900 that supplies water when the storage battery is charged in FIG.

  The hot water storage unit 900 includes a storage battery 101 that charges and discharges power, power connection means 102 that uses and supplies the power of the storage battery 101, a hot water storage tank 103 that stores hot water, and water supply that supplies water from a commercial water tap to the hot water storage tank 103. From the pipe 104, the heat exchange means 105 for transferring the heat generated from the storage battery 101 to the water in the water supply pipe 104, the water supply valve 106 for adjusting the water supply from the water supply pipe 104 to the hot water storage tank 103, and the power connection means 102 A storage battery charge detection means 907 for detecting a state in which the storage battery 101 is charged with power generated by a power source or a fuel cell unit, and a water supply valve control means 908 for controlling opening and closing of the water supply valve 106 are provided.

  Here, the storage battery 101, the power connection means 102, the hot water storage tank 103, the water supply pipe 104, the heat exchange means 105, and the water supply valve 106 are the same as the configuration of the hot water storage unit 100 described above.

  Further, the water supply valve control means 908 has the same configuration as the water supply valve control means 708 described above.

  The storage battery charge detection unit 907 is a current sensor that detects charging of power to the storage battery 101, for example, a magnetic field induced around the current path of the power connection unit 102. Current sensors include a structure in which a magnetic core and a meter are combined, a current transformer structure in which a coil is wound around the magnetic core, and a magnetoelectric conversion element such as a Hall element disposed in a gap in the magnetic core. Select according to the power level of the power source and the flowing current such as DC / AC.

Next, regarding the flow of operation of the hot water storage unit 900 that supplies water when the storage battery is charged, FIG.
Will be described. In step S <b> 1001, the state of charge of the storage battery 101 is detected by the storage battery charge detection unit 907. In step S1002, when the storage battery 101 is charged, the operation proceeds to step S1003, and when the storage battery 101 is not charged, the operation proceeds to step S1004. In step S1003, the water supply valve control means 908 opens the water supply valve 106 and supplies water to the hot water storage tank 103 through the heat exchange means 105. In step S1004, the water supply valve control means 908 closes the water supply valve 106 and stops water supply. In addition, when the electric energy of charge of the storage battery 101 is small, since the heat generation of the storage battery 101 decreases, the effect of performing this operation is also reduced. For this reason, for example, when the power value from the power supply source exceeds a predetermined value such as 100 W or more, it is desirable to adjust the operation threshold according to the configuration of the system such as supplying water by the water supply valve control unit 908.

  By comprising in this way, when charging of the storage battery 101 is detected by the storage battery charging detection means 907, the water supply valve control means 908 opens the water supply valve 106 to supply water to the hot water storage tank 103. Since the heat generated by charging the storage battery 101 can be transmitted to the water at the time of water supply, the heat generated by the storage battery 101 can be used effectively. In addition, by suppressing the temperature rise of the storage battery 101, it is possible to reduce deterioration of the storage battery 101 due to heat generation and use at a high temperature.

  The intention to supply water when charging the storage battery 101 is, for example, when connected to an unstable power supply source that changes depending on the state of the sun, such as solar power generation, and the power supply status from the power supply source By supplying water to the hot water storage unit 900 at the timing matched with the above, the deterioration of the storage battery 101 is reduced and the heat generated by the storage battery 101 is used.

(Embodiment 6)
The invention of the present embodiment will be described using a configuration example of a hot water storage unit 1100 provided with an avoidance path in FIG.

  The hot water storage unit 1100 includes a storage battery 101 that charges and discharges power, power connection means 102 that uses and supplies the power of the storage battery 101, a hot water storage tank 103 that stores hot water, and water supply that supplies water from a commercial water tap to the hot water storage tank 103. A heat exchange means 105 for transferring heat generated from the pipe 104, the storage battery 101 to the water in the water supply pipe, a water supply valve 106 for adjusting the water supply from the water supply pipe 104 to the hot water storage tank 103, and the water supply pipe 104. There are provided an avoidance path 1107 for supplying water to the hot water storage tank 103 without passing, a switching valve 1108 for switching a water supply path passing through the avoidance path 1107 and the heat exchange means 105, and a water temperature detection means 1109 for detecting the temperature of the water to be supplied.

  Here, the storage battery 101, the power connection means 102, the hot water storage tank 103, the water supply pipe 104, the heat exchange means 105, and the water supply valve 106 are the same as the configuration of the hot water storage unit 100 described above.

  The avoidance path 1107 is another path of the water supply pipe 104 that supplies water from the water tap to the hot water storage tank 103 without passing through the heat exchange means 105.

  The switching valve 1108 is a valve that switches a path that passes through the avoidance path 1107 and the heat exchange means 105.

  The water temperature detecting means 1109 is a thermometer that measures the temperature of the water passing through the water supply pipe 104, for example, using a thermocouple, and may have any configuration as long as the water temperature can be measured. Absent.

  With this configuration, when the temperature of the water supplied by the water temperature detection unit 1109 is lower than, for example, 0 ° C., the path for supplying water by the switching valve 1108 is switched to the avoidance path 1107, and the heat exchange unit 105 is changed. By supplying water to the hot water storage tank 103 without passing it, the storage battery 101 can be prevented from being overcooled, so that the influence of the storage battery 101 at a low temperature can be reduced.

(Embodiment 7)
The invention of the present embodiment will be described using a configuration example of a hot water storage unit 1200 provided with the heat storage material of FIG.

  The hot water storage unit 1200 includes a storage battery 101 that charges and discharges power, power connection means 102 that uses and supplies the power of the storage battery 101, a hot water storage tank 103 that stores hot water, and water supply that supplies water from a commercial water tap to the hot water storage tank 103. A heat exchanger 105 for transferring heat generated from the pipe 104, the storage battery 101 to the water in the water supply pipe, a water supply valve 106 for adjusting the water supply from the water supply pipe 104 to the hot water storage tank 103, and a heat storage material at the place where the storage battery 101 is installed. 1207.

  Here, the storage battery 101, the power connection means 102, the hot water storage tank 103, the water supply pipe 104, the heat exchange means 105, and the water supply valve 106 are the same as the configuration of the hot water storage unit 100 described above.

  The heat storage material 1207 is made of a material having endothermic and heat storage properties, and the material and capacity are selected depending on the operating temperature, environment, and the like. In addition, by selecting the melting point of the heat storage material 1207 according to the specifications of the storage battery 101, when the storage battery 101 reaches a predetermined temperature or more, the heat storage material 1207 is deprived of heat when dissolved. Thus, it can be configured such that a rapid temperature change can be prevented more effectively. Here, the “predetermined temperature” is a temperature range in which the temperature change of the storage battery 101 is desired to be reduced. For example, by setting the upper limit value of the use range of the storage battery 101, the temperature of the storage battery 101 is likely to exceed the upper limit value. In such a case, it is possible to obtain a structure that prevents the temperature change.

  By comprising in this way, by absorbing the heat_generation | fever of the storage battery 101, a sudden temperature change can be prevented and deterioration by use under high temperature can be performed.

  As described above, the hot water storage tank according to the present invention includes a storage battery, and suppresses an increase in the temperature of the storage battery by transferring heat generated during charging and discharging of the storage battery to water supplied to the hot water storage tank by heat exchange means. Therefore, heat pump water heaters and households that can be used for general households and business use can be effectively used by reducing the deterioration of storage batteries due to heat generation and use at high temperatures, and also transferring the heat of the storage batteries to the water to be supplied. It can be used as a hot water storage unit such as an energy system combined with a fuel cell cogeneration system, an electric water heater, a solar water heater, or a solar panel.

100, 300, 500, 700, 900, 1100, 1200 Hot water storage unit 101 Storage battery 102 Power connection means 103 Hot water storage tank 104 Water supply pipe 105 Heat exchange means 106 Water supply valve 307, 507 Water supply detection means 308 Power load control means 508 Power supply control means 707 Storage battery discharge detection means 708, 908 Water supply valve control means 907 Storage battery charge detection means 1107 Avoidance path 1108 Switching valve 1109 Water temperature detection means 1207 Heat storage material

Claims (8)

A storage battery that charges and discharges power; a power connection means that connects to a power load and a power supply source to use and supply power of the storage battery; a hot water storage tank that stores hot water; a water supply pipe that supplies water to the hot water storage tank; A hot water storage unit comprising heat exchange means for transferring heat generated from the storage battery to water in a water supply pipe, and a water supply valve for adjusting water supply from the water supply pipe to the hot water storage tank. The hot water storage unit according to claim 1, wherein the storage battery is arranged at a position lower than the hot water storage tank to reduce the influence of heat generation of the hot water storage tank. A power supply detection means for detecting water supply from the water supply valve to the hot water storage unit; and a power load control means for operating a power load, and when the water supply detection means detects water supply, the power load control means The hot water storage unit according to claim 1 or 2, wherein the power of the storage battery is used from the power connection means. Water supply detection means for detecting water supply from the water supply valve to the hot water storage unit, and power supply control means for controlling supply of power to the storage battery from a power supply source via the power connection means, the water supply detection means The hot water storage unit according to any one of claims 1 to 3, wherein the storage battery is charged from the power connection means by the power supply control means when the water supply is detected at. A storage battery discharge detecting means for detecting the use of the power of the storage battery by the power load from the power connecting means; and a water supply valve control means for controlling the opening and closing of the water supply valve, wherein the storage battery discharge detecting means discharges the storage battery. The hot water storage unit according to any one of claims 1 to 4, wherein, when detected, the water supply valve control means opens the water supply valve to supply water to the hot water storage tank. A storage battery charge detection means for detecting charging of the storage battery by a power supply source from the power connection means, and a water supply valve control means for controlling opening and closing of the water supply valve, and detecting the charge of the storage battery by the storage battery charge detection means The hot water storage unit according to any one of claims 1 to 5, wherein when the water supply valve is operated, the water supply valve control means opens the water supply valve to supply water to the hot water storage tank. The water supply pipe has an avoidance path for supplying water to the hot water storage tank without passing through the heat exchange means, a switching valve for switching between the avoidance path and a path passing through the heat exchange means, and a water temperature detection means for detecting the temperature of the supplied water And when the water temperature supplied by the water temperature detecting means is lower than a predetermined temperature, the water supply path is switched to the switching valve to supply water to the hot water storage tank without passing through the heat exchanging means. The hot water storage unit according to any one of 6. The hot water storage unit according to any one of claims 1 to 7, wherein a heat storage material is provided at a place where the storage battery is installed to absorb heat generated by the storage battery.

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