JP2021118633A - Power storage system - Google Patents

Abstract

To provide a power storage system that can be stopped in stages according to the degree of inundation.SOLUTION: A power storage system 10A according to the present invention includes a box-shaped housing 11, power storage batteries 20a, 20b, 20c, and 20d arranged in multiple layers in a lower space 14, a charge/discharge circuit 30A arranged in an upper space 13, switch circuits Sa, Sb, and Sc arranged in the lower space 14, an inundation detection unit 21 that can detect the inundation of the power storage batteries 20a and 20b in the bottom layer, and a control unit 31A that controls the charge/discharge circuit 30A and the switch circuits Sa, Sb, and Sc on the basis of the detection result of the inundation detection unit 21. When the inundation detection unit 21 detects inundation, the control unit 31A controls the switch circuits Sa, Sb, and Sc to disconnect the power storage batteries 20a and 20b in the lowermost layer from the charge/discharge circuit 30A.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power storage system that supplies electric power stored in a storage battery in advance to various loads in the building in the event of a power failure, and more particularly to a power storage system that is installed and used outdoors in the building.

In recent years, in preparation for a large-scale natural disaster, by supplying electric power stored in advance in a storage battery (especially relatively inexpensive nighttime electric power), it has become possible to continuously operate important loads such as refrigerators in the event of a power outage. The spread of power storage systems that can be used is being promoted.

As shown in FIG. 7, the power storage system 100 is usually installed on a concrete foundation B provided in the vicinity of the building H by using bolts or the like. Further, the power storage system 100 usually includes a box-shaped housing 101, a plurality of storage batteries 103 arranged in the lower space 102 in the housing 101, and a charge / discharge circuit arranged in the upper space 104 in the housing 101. It is equipped with 105.

The arrangement of the storage battery 103 and the charge / discharge circuit 105 in the housing 101 is such that when the heavy storage battery 103 is arranged above the charge / discharge circuit 105 which is a heat generation source, the center of gravity of the power storage system 100 is arranged in this way. This is because the position becomes higher and the storage battery 103 is more likely to fall over, and the storage battery 103 is more easily affected by heat. Further, the reason why the upper surface of the foundation B is lower than the floor surface of the first floor of the building H is that the impact when the power storage system 100 falls due to an earthquake is relatively small.

Since the power storage system 100 is used outdoors, the housing 101 is designed to withstand wind and rain. However, in a situation where the building H is flooded due to the collapse of a river or the like, the ingress of water from the vent provided in the housing 101 is unavoidable, and as a result, the storage battery 103 may be flooded. .. Then, in order to safely stop the system in such a case, it has been studied to provide a plurality of inundation sensors (see, for example, Patent Document 1).

Japanese Patent No. 6437121

Detecting inundation and stopping the entire system is preferable from the viewpoint of safety, but depending on the degree of inundation, it is preferable to only partially stop the system and continue to supply power to critical loads. There is. However, conventional power storage systems including those described in Patent Document 1 are not configured to perform such an operation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power storage system capable of gradually stopping the operation according to the degree of inundation.

In order to solve the above problems, the first power storage system according to the present invention includes a housing, a plurality of storage batteries arranged so as to form a plurality of layers in a lower space inside the housing, and an upper space inside the housing. An arranged charge / discharge circuit for charging / discharging a plurality of storage batteries, a switch circuit arranged in the lower space for changing the connection state between the plurality of storage batteries and the charge / discharge circuit, and a lowermost layer arranged in the lower space. It is provided with a flood detection unit that can detect the inundation of the storage battery in the above, and a control unit that controls the charge / discharge circuit and the switch circuit based on the detection result of the inundation detection unit arranged in the housing. When the detection unit detects inundation, it is configured to control the switch circuit to disconnect the storage battery in the lowermost layer from the charge / discharge circuit.

In this configuration, when the inundation detection unit detects the inundation of the storage battery in the lowermost layer, only the storage battery in the lowermost layer is disconnected from the charge / discharge circuit. In other words, in this configuration, even if the inundation detection unit detects the inundation of the storage battery in the lowermost layer, the storage batteries in the layers other than the lowest layer are not separated from the charge / discharge circuit. Therefore, according to this configuration, when both flooding and power failure occur, various loads in the building can be operated by using the electric power stored in the storage battery that remains connected to the charge / discharge circuit.

The "inundation detection unit capable of detecting the inundation of the storage battery in the lowermost layer" includes an inundation detection unit configured / arranged so as to detect whether or not the storage battery in the lowermost layer is actually inundated. It shall include both inundation detection units configured / arranged so that it can detect whether or not the inundation of the storage battery in the bottom layer is imminent.

The first power storage system further includes a power failure detection unit that detects whether or not a power failure has occurred in the commercial power system, and a power failure detection unit when the control unit detects inundation. If it does not detect a power outage, it is preferably configured to control the charge / discharge circuit to charge at least one of the storage batteries in a layer other than the bottom layer with the power of the commercial power system.

In this case, it is more preferable that the control unit charges at least one of the storage batteries in the layers other than the bottom layer so as to exceed a preset upper limit charging rate.

According to this configuration, when a power failure occurs following flooding, various loads in the building can be operated for a long time.

The first power storage system further includes a power failure detection unit that detects whether or not a power failure has occurred in the commercial power system, and a power failure detection unit when the control unit detects inundation. If it detects a power outage, it is configured to control the charge / discharge circuit to discharge at least one of the storage batteries in layers other than the bottom layer and output the power generated by the discharge to the outside. It may have the configuration of.

In this case, it is preferable that the control unit discharges at least one of the storage batteries in the layers other than the lowest layer so as to be lower than the preset lower limit charge rate, and outputs the electric power generated by the discharge to the outside.

According to this configuration, various loads in the building can be operated for a long time in the event of a power failure.

In order to solve the above problems, the second power storage system according to the present invention includes a housing, a plurality of storage batteries arranged so as to form three or more layers in a lower space inside the housing, and an upper part inside the housing. A charge / discharge circuit for charging / discharging a plurality of storage batteries arranged in the space, a switch circuit arranged in the lower space for changing the connection state between the plurality of storage batteries and the charge / discharge circuit, and a switch circuit arranged in the lower space. A first inundation detection unit that can detect the inundation of the storage battery in the lowermost layer, a second inundation detection unit that can detect the inundation of the storage battery in the middle layer arranged in the lower space, and a second inundation detection unit arranged in the housing. It includes a control unit that controls the charge / discharge circuit and the switch circuit based on the detection results of the first inundation detection unit and the second inundation detection unit, and the control unit controls the switch circuit when the first inundation detection unit detects inundation. Then, the storage battery in the lowermost layer is separated from the charge / discharge circuit, and when the second inundation detection unit detects inundation, the switch circuit is controlled to disconnect the storage battery in the middle layer from the charge / discharge circuit. It has the configuration of.

In this configuration, when the first inundation detection unit detects the inundation of the storage battery in the lowermost layer, the storage battery in the lowermost layer is disconnected from the charge / discharge circuit, and when the second inundation detection unit detects the inundation of the storage battery in the middle layer, The storage battery in the middle layer is disconnected from the charge / discharge circuit. In other words, in this configuration, even if the first inundation detection unit detects the inundation of the storage battery in the lowermost layer, the storage batteries in the middle layer and the uppermost layer are not separated from the charge / discharge circuit, and the second inundation detection unit is in the middle layer. Even if the inundation of the storage battery is detected, the storage battery in the uppermost layer is not disconnected from the charge / discharge circuit. Therefore, according to this configuration, when both flooding and power failure occur, various loads in the building can be operated by using the electric power stored in the storage battery that remains connected to the charge / discharge circuit.

The "first inundation detection unit capable of detecting the inundation of the storage battery in the lowermost layer" is configured / arranged so as to be able to detect whether or not the storage battery in the lowermost layer is actually inundated. , And an inundation detection unit configured / arranged so as to be able to detect whether or not the inundation of the storage battery in the lowermost layer is imminent. The same applies to the "second inundation detection unit capable of detecting the inundation of the storage battery in the middle layer".

Further, the "middle layer" shall refer to all layers except the uppermost layer and the lowest layer. For example, when there are four layers, the second layer from the bottom and the third layer from the bottom are the middle layers.

The second power storage system further includes a power failure detection unit that detects whether or not a power failure has occurred in the commercial power system, and a charge / discharge circuit can be connected to a load installed on the first floor of the building. It has one output unit and a second output unit that can be connected to a load installed on the second floor of the building, and when the control unit detects inundation only by the first inundation detection unit, the power failure detection unit If a power failure is detected, the charge / discharge circuit is controlled to discharge the storage batteries in the uppermost layer and the middle layer, and the power generated by the discharge is output from the first output unit and the second output unit to generate the second inundation detection unit. If the power failure detection unit detects a power failure when is detecting inundation, the charge / discharge circuit is controlled to discharge the storage battery in the uppermost layer, and the power generated by the discharge is output only from the second output unit. It is preferably configured to allow.

In this configuration, when the second inundation detection unit detects inundation, that is, when the inundation is considerably progressing, the power supply to the first floor of the building via the first output unit is stopped. Therefore, according to this configuration, it is possible to prevent electric leakage caused by supplying electric power to a load immersed in water on the first floor of the building, a switchboard, or the like.

According to the present invention, it is possible to provide a power storage system capable of gradually stopping the operation according to the degree of inundation.

It is a block diagram which shows the schematic structure of the power storage system which concerns on 1st Example. It is a figure which shows the range of charge / discharge in 1st Example. It is a block diagram which shows the schematic structure of the power storage system which concerns on 2nd Example. It is a figure which shows the range of charge / discharge in 2nd Example. It is a block diagram which shows the schematic structure of the power storage system which concerns on 3rd Example. It is a figure which shows the arrangement of the storage battery in the modification. It is a block diagram which shows the schematic structure of the conventional power storage system.

Hereinafter, the power storage system according to the first to third embodiments of the present invention will be described with reference to the accompanying drawings.

[First Example]
FIG. 1 shows a power storage system 10A according to a first embodiment of the present invention. As shown in the figure, the power storage system 10A is installed on a concrete foundation B provided in the vicinity of the building H by using bolts or the like. Further, as shown in the figure, the power storage system 10A includes a box-shaped housing 11 with legs 12 and four storage batteries 20a, 20b, 20c, 20d, 3 arranged in the lower space 14 in the housing 11. It includes a switch circuit composed of two relays Sa, Sb, and Sc, a flood detection unit 21, a charge / discharge circuit 30A, a control unit 31A, and a power failure detection unit 32 arranged in the upper space 13 in the housing 11. ..

The storage batteries 20a, 20b, 20c, 20d are made of a lithium ion battery, a lead storage battery, a nickel hydrogen storage battery, or the like. The capacities of the storage batteries 20a, 20b, 20c, and 20d may be the same or different.

The storage batteries 20a, 20b, 20c, and 20d are arranged so as to form two layers. That is, two of the four (storage batteries 20a and 20b) are arranged in the lowermost layer of the lower space 14, and the remaining two (storage batteries 20c and 20d) are arranged in the uppermost layer of the lower space 14.

The relays Sa, Sb, and Sc constituting the switch circuit are configured to be in an ON state (closed state) or an OFF state (open state) under the control of the control unit 31A. As shown in Table 1, in the switch circuit, the first state in which the relays Sa and Sb are in the ON state and the relay Sc is in the OFF state, and the relays Sa and Sb are in the OFF state and the relay Sc is in the ON state. It is possible to take a second state, which is a state.

When the switch circuit takes the first state, all four storage batteries 20a, 20b, 20c, and 20d connected in series are connected to the charge / discharge circuit 30A. On the other hand, when the switch circuit takes the second state, only the two storage batteries 20c and 20d on the uppermost layer are connected in series and connected to the charge / discharge circuit 30A. That is, when the switch circuit takes the second state, the two storage batteries 20a and 20b in the lowermost layer are separated from the charge / discharge circuit 30A.

The inundation detection unit 21 is arranged slightly below the storage batteries 20a and 20b in the lowermost layer. As a result, the inundation detection unit 21 can detect whether or not the inundation of the storage batteries 20a and 20b is imminent. The inundation detection unit 21 outputs a signal related to the detection result to the control unit 31A.

The charge / discharge circuit 30A is composed of a bidirectional DC / AC inverter or the like. The charge / discharge circuit 30A can convert the electric power of the commercial power system G input via the power failure detection unit 32 into direct current to charge the storage batteries 20a, 20b, 20c, and 20d. Further, the charge / discharge circuit 30A converts the electric power stored in the storage batteries 20a, 20b, 20c, and 20d into alternating current, and the load installed in the building H (general load La and so as not to cause reverse power flow to the commercial power system G). It can also be supplied to the critical load Lb) (normal discharge mode). At this time, if the discharge power from the storage batteries 20a, 20b, 20c, 20d is insufficient with respect to the power supplied to the load (load power), the shortage power is supplemented from the commercial power system G. Further, the charge / discharge circuit 30A can convert the electric power stored in the storage batteries 20a, 20b, 20c, 20d into alternating current and supply it only to the important load Lb (discharging mode at the time of power failure). Further, the charge / discharge circuit 30A can also supply electric power to the general load La and / or the critical load Lb while charging the storage batteries 20a, 20b, 20c, 20d (normal charge mode). The charge / discharge circuit 30A performs these operations under the control of the control unit 31A.

The power failure detection unit 32 detects whether or not a power failure has occurred in the commercial power system G based on the voltage of the commercial power system G. The power failure detection unit 32 outputs a signal related to the detection result to the control unit 31A.

The control unit 31A is composed of a microprocessor (MPU, Micro Processing Unit) and the like. The control unit 31A controls the charge / discharge circuit 30A and the switch circuit (relays Sa, Sb, Sc) based on the detection results of the inundation detection unit 21 and the power failure detection unit 32. Hereinafter, the control by the control unit 31A will be specifically described.

When the inundation detection unit 21 has not detected inundation and the power failure detection unit 32 has not detected a power failure, the control unit 31A puts the switch circuit in the first state. Further, in this case, the control unit 31A controls the charge / discharge circuit 30A to charge the storage batteries 20a, 20b, 20c, 20d with relatively inexpensive nighttime power, and reduces the purchase amount of relatively expensive daytime power. Therefore, the storage batteries 20a, 20b, 20c, and 20d are discharged in the daytime. At this time, the control unit 31A uses the storage batteries 20a, 20b, 20c, 20d within a preset normal use range (10% to 80%) in order to prevent the life of the storage batteries 20a, 20b, 20c, 20d from being shortened. Charge and discharge (see FIG. 2).

When the inundation detection unit 21 has not detected inundation and the power failure detection unit 32 has detected a power failure, the control unit 31A puts the switch circuit in the first state. Further, in this case, the control unit 31A controls the charge / discharge circuit 30A in order to prevent the operation of the critical load Lb installed in the building H from stopping, and sets the storage batteries 20a, 20b, 20c, 20d at the lower limit of the normal use range. Discharge to a certain lower limit charge rate (10%).

When the inundation detection unit 21 has detected inundation and the power failure detection unit 32 has not detected a power failure, the control unit 31A puts the switch circuit in the second state. Further, in this case, the control unit 31A controls the charge / discharge circuit 30A regardless of whether it is daytime or nighttime, and uses the storage batteries 20c and 20d at the upper limit charge rate (80%), which is the upper limit of the normal use range. Charge up to.

The reason why the two storage batteries 20a and 20b in the lowermost layer are separated from the charge / discharge circuit 30A with the switch circuit in the second state is that when the operating storage battery is flooded, electric leakage occurs and an abnormality is detected in the charge / discharge circuit 30A. This is because the circuit detects the leakage and the power storage system 10A is urgently stopped. Further, the reason why the storage batteries 20c and 20d are charged regardless of whether it is daytime or nighttime is that a power failure often occurs after flooding. By starting charging immediately when inundation is detected, the critical load Lb installed in the building H can be operated for a long time in the event of a power failure.

When the inundation detection unit 21 detects inundation and the power failure detection unit 32 detects a power failure, the control unit 31A puts the switch circuit in the second state. Further, in this case, the control unit 31A controls the charge / discharge circuit 30A regardless of whether it is daytime or nighttime, and discharges the storage batteries 20c and 20d to the lower limit charge rate (10%). As a result, it is possible to prevent the operation of the critical load Lb installed in the building H from being stopped.

[Second Example]
FIG. 3 shows the power storage system 10B according to the second embodiment of the present invention. As shown in the figure, the power storage system 10B is different from the power storage system 10A in that it includes the control unit 31B instead of the control unit 31A, but is common to the power storage system 10A in other respects. ..

Also in this embodiment, when the inundation detection unit 21 detects inundation, the control unit 31B controls the charge / discharge circuit 30A to charge / discharge the storage batteries 20c and 20d. At this time, the control unit 31B charges and discharges the storage batteries 20c and 20d within the extended use range (0% to 100%) shown in FIG. As a result, the critical load Lb installed in the building H can be operated for a longer period of time. Since flooding rarely occurs, the storage batteries 20c and 20d are discharged so as to be below the normal lower limit charge rate of 10%, and the storage batteries 20c and 20d are charged so as to exceed the normal upper limit charge rate of 80%. Even if it is allowed to do so, there is almost no effect on the life of the storage batteries 20c and 20d.

When the inundation detection unit 21 does not detect inundation, the control unit 31B charges and discharges the storage batteries 20a, 20b, 20c, and 20d within a preset normal use range.

[Third Example]
FIG. 5 shows the power storage system 10C according to the third embodiment of the present invention. As shown in the figure, the power storage system 10C includes storage batteries 20e and 20f in addition to the storage batteries 20a, 20b, 20c and 20d, and inundation detection in addition to the inundation detection unit 21 (first inundation detection unit). The point that the part 22 (the second inundation detection part) is provided, the point that the switch circuit further includes the relays Sd, Se, and Sf, and the point that the charge / discharge circuit 30C is provided instead of the charge / discharge circuit 30A. It differs from the power storage system 10A in that it is provided with a control unit 31C instead of the control unit 31A, but is common to the power storage system 10A in other respects.

Like the storage batteries 20a, 20b, 20c, and 20d, the storage batteries 20e and 20f are made of a lithium ion battery, a lead storage battery, a nickel hydrogen storage battery, or the like. The capacities of the six storage batteries 20a, 20b, 20c, 20d, 20e, and 20f may be the same or different.

The storage batteries 20a, 20b, 20c, 20d, 20e, and 20f are arranged so as to form three layers. That is, two of the six (batteries 20a, 20b) are arranged in the lowermost layer of the lower space 14, the other two (batteries 20c, 20d) are arranged in the middle layer of the lower space 14, and the remaining two (storage batteries 20c, 20d) are arranged. The storage batteries 20e and 20f) are arranged in the uppermost layer of the lower space 14.

なお、第３状態において、リレーＳａ，Ｓｂ，Ｓｃは任意の状態をとることができる。 Like the relays Sa, Sb, and Sc, the relays Sd, Se, and Sf are configured to be in an ON state or an OFF state under the control of the control unit 31C. As shown in Table 2, in the switch circuit, the first state in which the relays Sa, Sb, Sd, and Se are in the ON state and the relays Sc and Sf are in the OFF state, and the relays Sa, Sb, and Sf are in the OFF state. It is possible to take a second state in which the relays Sc, Sd, and Se are turned on, and a third state in which the relays Sd and Se are turned off and the relay Sf is turned on.

In the third state, the relays Sa, Sb, and Sc can take any state.

When the switch circuit takes the first state, all six storage batteries 20a, 20b, 20c, 20d, 20e, and 20f connected in series are connected to the charge / discharge circuit 30C. When the switch circuit takes the second state, the four storage batteries 20c, 20d, 20e, and 20f in the uppermost layer and the middle layer are connected in series to the charge / discharge circuit 30C. When the switch circuit takes the third state, the two storage batteries 20e and 20f on the uppermost layer connected in series are connected to the charge / discharge circuit 30C. That is, when the switch circuit takes the second state, the two storage batteries 20a and 20b in the lowermost layer are separated from the charge / discharge circuit 30C, and when the switch circuit takes the third state, the four storage batteries in the middle layer and the lowermost layer. 20a, 20b, 20c, 20d are separated from the charge / discharge circuit 30C.

The inundation detection unit 22 is arranged at a position slightly below the storage batteries 20c and 20d in the middle layer and higher than the floor surface of the first floor of the building H. As a result, the inundation detection unit 22 can detect whether or not the inundation of the storage batteries 20c and 20d is imminent and whether or not the inundation on the floor of the building H has occurred. The inundation detection unit 22 outputs a signal related to the detection result to the control unit 31C.

Like the charge / discharge circuit 30A, the charge / discharge circuit 30C is composed of a bidirectional DC / AC inverter or the like. The charge / discharge circuit 30C has a first output unit connected to the load (important load Lb) on the first floor of the building H and a second output unit connected to the load (important load Lc) on the second floor of the building H. Have. The charge / discharge circuit 30C can convert the electric power of the commercial power system G input via the power failure detection unit 32 into direct current and charge the storage batteries 20a, 20b, 20c, 20d, 20e, 20f. Further, the charge / discharge circuit 30C converts the electric power stored in the storage batteries 20a, 20b, 20c, 20d, 20e, 20f into alternating current, and the general load La and the important load Lb, so as not to cause reverse power flow to the commercial power system G. It can also be supplied to Lc (normal discharge mode). At this time, if the discharge power from the storage batteries 20a, 20b, 20c, 20d, 20e, 20f is insufficient with respect to the power supplied to the load (load power), the shortage power is supplemented from the commercial power system G. Further, the charge / discharge circuit 30C converts the electric power stored in the storage batteries 20a, 20b, 20c, 20d, 20e, 20f into alternating current and supplies it to both the critical loads Lb and Lc, or supplies only to the critical load Lc. It can also be done (discharge mode during power failure). Further, the charge / discharge circuit 30C can also supply electric power to the general load La and / or the critical load Lb, Lc while charging the storage batteries 20a, 20b, 20c, 20d, 20e, 20f (normal charge mode). The charge / discharge circuit 30C performs these operations under the control of the control unit 31C.

Like the control unit 31A, the control unit 31C is composed of a microprocessor and the like. The control unit 31C controls the charge / discharge circuit 30C and the switch circuit (relays Sa, Sb, Sc, Sd, Se, Sf) based on the detection results of the inundation detection units 21 and 22 and the power failure detection unit 32. Hereinafter, the control by the control unit 31C will be specifically described.

When the inundation detection units 21 and 22 have not detected inundation and the power failure detection unit 32 has not detected a power failure, the control unit 31C puts the switch circuit in the first state. Further, in this case, the control unit 31C controls the charge / discharge circuit 30C to charge the storage batteries 20a, 20b, 20c, 20d, 20e, 20f with relatively inexpensive nighttime power, or uses relatively expensive daytime power. In order to reduce the purchase amount, the storage batteries 20a, 20b, 20c, 20d, 20e, and 20f are discharged in the daytime. The electric power generated by the discharge is supplied to the important load Lb on the first floor of the building H via the first output unit, and is also supplied to the important load Lc on the second floor of the building H via the second output unit. Further, the electric power generated by the discharge is also supplied to the general load La.

When the inundation detection units 21 and 22 have not detected inundation and the power failure detection unit 32 has detected a power failure, the control unit 31C puts the switch circuit in the first state. Further, in this case, the control unit 31C controls the charge / discharge circuit 30C to control the storage batteries 20a, 20b, 20c, 20d, 20e, 20f in order to prevent the operation of the important loads Lb, Lc installed in the building H from stopping. Discharge. The electric power generated by the discharge is supplied to the important load Lb on the first floor of the building H via the first output unit, and is also supplied to the important load Lc on the second floor of the building H via the second output unit.

When only the inundation detection unit 21 detects the inundation and the power failure detection unit 32 does not detect the power failure, the control unit 31C puts the switch circuit in the second state. Further, in this case, the control unit 31C controls the charge / discharge circuit 30C regardless of whether it is daytime or nighttime, and 80% or 100 of the storage batteries 20c, 20d, 20e, 20f in the uppermost layer and the middle layer. Charge up to%.

When only the inundation detection unit 21 detects inundation and the power failure detection unit 32 detects a power failure, the control unit 31C puts the switch circuit in the second state. Further, in this case, the control unit 31C controls the charge / discharge circuit 30C regardless of whether it is daytime or nighttime, and 10% or 0 of the storage batteries 20c, 20d, 20e, 20f in the uppermost layer and the middle layer. %, And the electric power generated by the discharge is supplied to the important load Lb on the first floor of the building H via the first output unit, and the electric power is supplied to the important load Lc on the second floor of the building H via the second output unit. Supply.

When both the inundation detection units 21 and 22 have detected inundation and the power failure detection unit 32 has not detected a power failure, the control unit 31C puts the switch circuit in the third state. Further, in this case, the control unit 31C controls the charge / discharge circuit 30C regardless of whether it is daytime or nighttime, and charges the storage batteries 20e and 20f in the uppermost layer to 80% or 100%.

When both the inundation detection units 21 and 22 have detected inundation and the power failure detection unit 32 has detected a power failure, the control unit 31C puts the switch circuit in the third state. Further, in this case, the control unit 31C controls the charge / discharge circuit 30C regardless of whether it is daytime or nighttime, discharges the storage batteries 20e and 20f in the uppermost layer to 10% or 0%, and discharges the batteries. Power is supplied to the critical load Lc on the second floor of the building H via the second output unit. The reason why the power from the discharge is not supplied to the important load Lb on the first floor of the building H is that if the power is supplied to the first floor when the floor is flooded, the above-mentioned leakage protection is activated and the power storage system 10C is activated. This is because there is a risk of an emergency stop.

Although the power storage system according to the first to third embodiments of the present invention has been described above, the configuration of the present invention is not limited to these.

[First modification]
For example, in the power storage system according to the present invention, the storage batteries 20a and 20b and the switch circuits (relays Sa and Sb) shown in FIG. 6A may be arranged in the lower space. In this case, it can be said that the storage battery 20a is arranged in the lowermost layer and the storage battery 20b is arranged in the uppermost layer.

The relays Sa and Sb are configured to be in an ON state or an OFF state under the control of the control unit. As shown in Table 3, in the switch circuit, the first state in which the relay Sa is in the ON state and the relay Sb is in the OFF state, and the relay Sa is in the OFF state and the relay Sb is in the ON state. The second state can be taken. The control unit switches the state of the switch circuit according to the degree of inundation detected by the inundation detection unit.

When the switch circuit takes the first state, the two storage batteries 20a and 20b connected in series are connected to the charge / discharge circuit. On the other hand, when the switch circuit takes the second state, only the storage battery 20b on the uppermost layer is connected to the charge / discharge circuit. That is, when the switch circuit takes the second state, the storage battery 20a in the lowermost layer is disconnected from the charge / discharge circuit.

[Second modification]
Further, the power storage system according to the present invention includes storage batteries 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h and switch circuits (relays Sa, Sb, Sc, Sd, Se, Sf, shown in FIG. 6B). Sg, Sh) may be arranged in the lower space. In this case, it can be said that the storage batteries 20a, 20b, 20c are arranged in the lowermost layer, the storage battery 20h is arranged in the uppermost layer, and the remaining storage batteries 20d, 20e, 20f, 20g are arranged in the middle layer.

なお、第３状態および第４状態において、リレーＳａ，Ｓｂ，Ｓｃは任意の状態をとることができる。また、第４状態において、リレーＳｄ，Ｓｅ，Ｓｆは任意の状態をとることができる。 The relays Sa, Sb, Sc, Sd, Se, Sf, Sg, and Sh are configured to be in the ON state or the OFF state under the control of the control unit. As shown in Table 4, the switch circuit has a first state in which the relays Sa, Sb, Sd, Se, and Sg are in the ON state and the relays Sc, Sf, and Sh are in the OFF state, and the relays Sa, Sb, The second state in which Sf and Sh are in the OFF state and the relays Sc, Sd, Se and Sg are in the ON state, and the relays Sd, Se and Sh are in the OFF state and the relays Sf and Sg are in the ON state. It is possible to take a third state in which the relay Sg is turned off and a fourth state in which the relay Sg is turned off and the relay Sh is turned on. The control unit switches the state of the switch circuit according to the degree of inundation detected by the three inundation detection units.

In the third and fourth states, the relays Sa, Sb, and Sc can take any state. Further, in the fourth state, the relays Sd, Se, and Sf can take any state.

When the switch circuit takes the first state, eight storage batteries 20a, 20b, 20c, 20d, 20e, 20f, 20g, and 20h connected in series are connected to the charge / discharge circuit. When the switch circuit takes the second state, five storage batteries 20d, 20e, 20f, 20g, and 20h connected in series are connected to the charge / discharge circuit. When the switch circuit takes the third state, three storage batteries 20f, 20g, and 20h connected in series are connected to the charge / discharge circuit. Further, when the switch circuit takes the fourth state, only the storage battery 20h is connected to the charge / discharge circuit. That is, when the switch circuit takes the second state, the storage batteries 20a, 20b, 20c are separated from the charge / discharge circuit, and when the switch circuit takes the third state, the storage batteries 20d, 20e are further separated from the charge / discharge circuit, and the switch. When the circuit takes the fourth state, the storage batteries 20f and 20g are further separated from the charge / discharge circuit.

[Other variants]
Further, the power storage system according to the present invention does not have to include a power failure detection unit. In this case, the control unit can perform the above control based on a signal regarding the presence or absence of a power failure provided from the outside.

Further, the inundation detection unit 21 may be arranged at the same height as the lower end of the storage battery in the lowermost layer. In this case, the inundation detection unit 21 can detect whether or not the storage battery in the lowermost layer is actually inundated. The same applies to the inundation detection unit 22.

Further, when there is a general load on the second floor of the building H, the power storage system 10C according to the third embodiment supplies power to the general load on the second floor so that reverse power flow to the commercial power system G does not occur. May be good. Further, the building H may have n floors (where n is an integer of 3 or more), and the present invention can be applied even when there is a significant load (and general load) on the n floor.

Further, the power storage system according to the present invention may be configured to connect the storage battery to the discharge circuit and discharge the electric power stored in the storage battery at the same time as disconnecting the storage battery from the charge / discharge circuit.

10A, 10B, 10C Power storage system 11 Housing 12 Legs 13 Upper space 14 Lower space 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h Storage battery 21 Inundation detection unit (1st inundation detection unit)
22 Inundation detection unit (second inundation detection unit)
30A, 30C Charge / discharge circuit 31A, 31B, 31C Control unit 32 Power failure detection unit B Basic G Commercial power system H Building Sa, Sb, Sc, Sd, Se, Sf, Sg, Sh relay

Claims (7)

With the housing
A plurality of storage batteries arranged so as to form a plurality of layers in the lower space in the housing, and
A charge / discharge circuit for charging / discharging the plurality of storage batteries arranged in the upper space in the housing, and
A switch circuit arranged in the lower space to change the connection state between the plurality of storage batteries and the charge / discharge circuit,
An inundation detection unit that can detect the inundation of the storage battery in the lowermost layer, which is arranged in the lower space, and
A control unit that controls the charge / discharge circuit and the switch circuit based on the detection result of the inundation detection unit arranged in the housing.
With
The control unit is a power storage system characterized in that when the inundation detection unit detects inundation, the switch circuit is controlled to disconnect the storage battery in the lowermost layer from the charge / discharge circuit. It is further equipped with a power failure detection unit that detects whether or not a power failure has occurred in the commercial power system.
If the power failure detection unit does not detect the power failure when the inundation detection unit detects inundation, the control unit controls the charge / discharge circuit and uses the power of the commercial power system to obtain the maximum power. The power storage system according to claim 1, wherein the power storage system is configured to charge at least one of storage batteries in a layer other than the lower layer. If the power failure detection unit does not detect the power failure when the inundation detection unit detects inundation, the control unit controls the charge / discharge circuit and uses the power of the commercial power system to obtain the maximum power. The power storage system according to claim 2, wherein at least one of the storage batteries in a layer other than the lower layer is charged so as to exceed a preset upper limit charging rate. It is further equipped with a power failure detection unit that detects whether or not a power failure has occurred in the commercial power system.
If the power failure detection unit detects the power failure while the flood detection unit detects the inundation, the control unit controls the charge / discharge circuit to control the storage battery in a layer other than the bottom layer. The power storage system according to claim 1, wherein at least one of the above is discharged and the electric power generated by the discharge is output to the outside. If the power failure detection unit detects the power failure while the flood detection unit detects the inundation, the control unit controls the charge / discharge circuit to control the storage battery in a layer other than the bottom layer. The power storage system according to claim 4, wherein at least one of the above is discharged so as to be lower than a preset lower limit charge rate, and the electric power generated by the discharge is output to the outside. With the housing
A plurality of storage batteries arranged so as to form three or more layers in the lower space in the housing, and
A charge / discharge circuit for charging / discharging the plurality of storage batteries arranged in the upper space in the housing, and
A switch circuit arranged in the lower space to change the connection state between the plurality of storage batteries and the charge / discharge circuit,
A first inundation detection unit that can detect inundation of the storage battery in the lowermost layer, which is arranged in the lower space, and
A second inundation detection unit that can detect inundation of the storage battery in the middle layer, which is arranged in the lower space, and
A control unit that controls the charge / discharge circuit and the switch circuit based on the detection results of the first inundation detection unit and the second inundation detection unit arranged in the housing.
With
When the first inundation detection unit detects inundation, the control unit controls the switch circuit to disconnect the storage battery in the lowermost layer from the charge / discharge circuit, and the second inundation detection unit detects inundation. A power storage system characterized in that the switch circuit is controlled to separate the storage battery in the middle layer from the charge / discharge circuit. It is further equipped with a power failure detection unit that detects whether or not a power failure has occurred in the commercial power system.
The charge / discharge circuit has a first output unit that can be connected to a load installed on the first floor of the building and a second output unit that can be connected to a load installed on the second floor of the building.
If the power failure detection unit detects the power failure when only the first inundation detection unit detects the inundation, the control unit controls the charge / discharge circuit to the uppermost layer and the middle layer. A storage battery is discharged, and the electric power generated by the discharge is output from the first output unit and the second output unit. When the second inundation detection unit detects inundation, the power failure detection unit detects the power failure. If so, the charging / discharging circuit is controlled to discharge the storage battery in the uppermost layer and to output the electric power generated by the discharging only from the second output unit. The power storage system according to 6.

Images