JP2012084486A - Power storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage system capable of securing safety while a power storage capacity can be easily changed.SOLUTION: A power storage system has a plurality of cell modules BT, a battery module 20 having a second housing for housing the plural cell modules BT, an AC/DC conversion part 14 for outputting an alternating current to a power distribution system and converting the alternating current acquired by the power distribution system into a direct current, a DC/DC conversion part 16 for converting the direct current outputted from the AC/DC conversion part 14 into a direct current of a predetermined strength and outputting it to the battery module 20, and converting the direct current outputted from the battery module 20 into a direct current of a predetermined strength and outputting it to the AC/DC conversion part 14, a supervisory control device 30 for controlling an action of the AC/DC conversion part 14 and the DC/DC conversion part 16, and a control unit 10 housing the AC/DC conversion part 14, the DC/DC conversion part 16, and the supervisory control device 30 and having a first housing with a size identical to that of the second housing.

Description

  Embodiments described herein relate generally to a power storage system.

As the secondary battery, a lead battery, a nickel metal hydride battery, or a lithium ion battery is used. These secondary batteries have different characteristics.
For example, a lead battery requires a relatively long time for charging, but can discharge at a high speed and can be used for a long time. Lithium ion batteries can be charged and discharged at high speed, but are expensive. These secondary batteries are desirably used appropriately in accordance with their characteristics.

  In recent years, power generation systems using renewable energy such as solar power generation and wind power generation that do not emit greenhouse gases during power generation have been installed, and reduction in carbon of the power supply system is being studied. In power generation using renewable energy, it is difficult to control the amount of power supply, and it is difficult to realize stable power supply.

  In the future, if the number of power generation facilities that use renewable energy expands, the short-term balance between power supply and demand will be disrupted, and the frequency of power will deviate from the appropriate value. The quality may deteriorate.

  Therefore, in addition to installing secondary batteries in the power distribution system that store surplus power from power generation facilities that use renewable energy, it is also possible to store and distribute power by using power storage facilities installed in consumers, etc. It is being considered.

JP 2005-86927 A

  The power storage capacity installed in each consumer changes the required power storage capacity according to the expansion or contraction of the scale of the consumer. For example, when a building where power storage equipment is installed is expanded, the required power storage capacity increases. At this time, if a new power storage facility is added to cover the increased power storage capacity, it is necessary to secure an installation space and the management of the facility by the energy management system (EMS) may be complicated. It was.

  In addition, since a dangerous state such as ignition from a secondary battery cell may occur when the power storage facility becomes hot, a mechanism for cooling without stopping even when maintaining the power storage facility is provided to ensure safety. It is desirable that

  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 that can easily change the arrangement position and the power storage capacity and ensures safety.

  The power storage system according to the embodiment outputs an alternating current to a power distribution system, a battery module including a plurality of cell modules and a second housing that houses the plurality of cell modules, and the power module is acquired from the power distribution system An AC / DC converter that converts an alternating current into a direct current and outputs it, a direct current output from the AC / DC converter is converted into a direct current of a predetermined magnitude, and is output to the battery module. A DC / DC converter that converts a DC current output from the battery module into a DC current of a predetermined magnitude and outputs the DC current to the AC / DC converter; and the AC / DC converter and the DC / DC converter A general control device that controls operation, the AC / DC conversion unit, the DC / DC conversion unit, and the general control device are accommodated, and the first control unit has the same size as the second casing. Having a control unit comprising a body, a, a.

It is a figure for demonstrating the example of 1 structure of the electrical storage system which concerns on embodiment. It is a figure for demonstrating the structural example when the arrangement position of the control unit and battery module of the electrical storage system shown in FIG. 1 is changed. It is a figure for demonstrating the other structural example of the electrical storage system which concerns on embodiment. It is a figure which shows the example of 1 structure of the fixing member of the electrical storage system shown in FIG. It is a figure for demonstrating the other structural example of the electrical storage system which concerns on embodiment. It is a figure which shows one structural example of the fixing member of the electrical storage system shown in FIG. It is a figure for demonstrating one structural example of the battery module of the electrical storage system which concerns on embodiment. It is a figure for demonstrating one structural example of the slide plate of the battery module shown in FIG. It is a figure for demonstrating one structural example of the housing | casing of the battery module of the electrical storage system which concerns on embodiment. It is a figure for demonstrating the example of 1 structure of the housing | casing of the control unit of the electrical storage system which concerns on embodiment. It is a figure for demonstrating one structural example for the air cooling when the battery module shown in FIG. 9 and the control unit shown in FIG. 10 are combined. It is a figure for demonstrating one structural example for the water cooling of the electrical storage system which concerns on embodiment. It is a figure for demonstrating an example of operation | movement of the cooling unit shown in FIG. It is a figure for demonstrating one structural example for the water cooling of the electrical storage system which concerns on embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
In FIG. 1, the example of 1 structure of the electrical storage system which concerns on this embodiment is shown. The power storage system according to the present embodiment includes a control unit 10 and three battery modules 20A, 20B, and 20C.

  The control unit 10 includes a cooling unit 12, an AC / DC conversion unit 14, and a DC / DC conversion unit 16. The cooling unit 12, the AC / DC conversion unit 14, and the DC / DC conversion unit 16 are accommodated in a substantially rectangular parallelepiped housing 1. The cooling unit 12 is disposed above the control unit 10, the AC / DC conversion unit 14 is disposed below the cooling unit 12, and the DC / DC conversion unit 16 is disposed below the AC / DC conversion unit 16.

  The casing 2 of the battery modules 20A, 20B, and 20C and the casing 1 of the control unit 10 have the same size in the width direction D1, the thickness direction D2, and the height direction D3. Therefore, the control unit 10 and the battery modules 20A, 20B, and 20C can be arranged side by side in the width direction D1, and can also be arranged side by side in the height direction D3.

  In the case shown in FIG. 1, the control unit 10 and the battery module 20A are arranged side by side in the height direction D3, and the battery module 20B and the battery module 20C are arranged side by side in the height direction D3. Further, the battery module 20A and the battery module 20C are arranged in the width direction D1, and the control unit 10 and the battery module 20B are arranged in the width direction D1.

FIG. 2 shows an example in which the control unit 10 and the battery modules 20A, 20B, and 20C are arranged side by side in the width direction D1.
Since the size of the housing 2 of the control unit 10 and the battery modules 20A, 20B, and 20C is the same, the control unit 10 and the battery modules 20A, 20B, and 20C are arranged side by side in the width direction D1 or the height direction D3. However, the outer shape of the power storage system does not become uneven. Further, the positions of the control unit 10 and the battery modules 20A, 20B, and 20C can be changed according to the space in which the power storage system is disposed.

  The control unit 10 and the battery modules 20A, 20B, and 20C are adsorbed and fixed to each other by magnetic force using, for example, the principle of a magnet chuck. A switching unit 22 for turning on and off the magnetic force is provided in the housing 2 of the control unit 10 and the battery modules 20A, 20B, and 20C.

  Magnets (not shown) such as permanent magnets and electromagnets are built in the casings 1 and 2 of the control unit 10 and the battery modules 20A, 20B, and 20C, and between the magnets and the casings 1 and 2 to be attracted. When a non-magnetic material (not shown) and a yoke plate (not shown) are arranged and the magnetic force is turned on by the switching unit 22, the magnetic field lines from the magnet bypass the non-magnetic material and the housing to be attracted. The route goes through the bodies 1 and 2. When the magnetic force is turned off by the switching unit 22, the nonmagnetic material and the yoke plate slide so that the magnetic lines of force from the magnet do not pass through the adsorption target.

  In this way, the control unit 10 and the battery modules 20A, 20B, and 20C can be fixed and positioned with each other by magnetic force.

  FIG. 3 shows another example of a configuration for fixing the control unit 10 and the battery modules 20A, 20B, and 20C. The casings 1 and 2 of the control unit 10 and the battery modules 20A, 20B, and 20C are provided with connecting portions 19 and 29 at corners including an edge that extends in the thickness direction D2. A fixing member 40 is screwed to the connection portions 19 and 29. In addition, since the connection parts 19 and 29 are the same structures, below, the connection part 29 is demonstrated and description of the connection part 19 is abbreviate | omitted.

  The connection portion 29 includes four screw holes 29H and a connector 29C disposed at the center portion in the thickness direction D2. Of the four screw holes 29H, the screws 50 are inserted into the two screw holes 29H in the height direction D3, and the screws 50 are inserted into the remaining two screw holes 29H in the width direction D1. A central portion of the connection portion 29 in the thickness direction D2 is provided with a plane passing through the thickness direction D2 and a direction intersecting the width direction D1 and the height direction D3, and the connector 29C is disposed on this plane.

  For example, when the battery modules 20 are arranged side by side in the height direction D <b> 1, the connection portion 29 provided on the upper surface side of the lower battery module 20 and the connection portion provided on the bottom surface side of the upper battery module 20. 29 are arranged facing each other. By arranging the two connecting portions 29 side by side, a concave portion recessed in the width direction D1 is formed in the central portion in the thickness direction D2 so that a cross section in a plane substantially perpendicular to the thickness direction D2 is a triangle. The

  FIG. 4 shows a configuration example of the fixing member 40. The fixing member 40 has a shape that is a combination of a substantially rectangular parallelepiped plate and a convex portion that protrudes from the central portion in the longitudinal direction of the plate and has a triangular cross section in a plane substantially perpendicular to the longitudinal direction. The fixing member 40 includes a screw hole 42 disposed in the vicinity of each of the four corners of the plate body, and a connector 44 disposed on each of the two inclined surfaces of the convex portion.

  The convex part of the fixing member 40 has a shape that fits into the concave part of the two connecting parts 29 arranged side by side. When attached so that the convex part of the fixing member 40 and the concave part of the two connection parts 29 are fitted, the screw hole 29H of the connection part 29 and the screw hole 42 of the fixing member 40 communicate with each other, and the connector 29C The connector 44 is electrically connected. The fixing member 40 positions and fixes the two battery modules 20 by the screws 50 inserted into the screw holes 42 and the screw holes 29H, and the two battery modules 20 connect the two connectors 44 of the fixing member 40 inside. Are electrically connected.

  Thus, by attaching the fixing member 40 to the connecting portions 19 and 29, the control unit 10 and the battery modules 20A, 20B, and 20C can be fixed to each other and positioned. Similarly, the connection unit 19 of the control unit 10 and the connection unit 29 of the battery module 20 are also electrically connected by wiring internally connecting the two connectors 44 of the fixing member 40. Can be transmitted to each battery module 20.

  FIG. 5 shows another example of a configuration for fixing the control unit 10 and the battery modules 20A, 20B, and 20C. In this example, the casings 1 and 2 of the control unit 10 and the battery modules 20A, 20B, and 20C are provided with connecting portions 19 ′ and 29 ′ at corners including an edge extending in the thickness direction D2. A fixing member 40 ′ is screwed to the connection portions 19 ′ and 29 ′. In addition, since connection part 19 ', 29' is the same structure, below, connection part 29 'is demonstrated and description of connection part 19' is abbreviate | omitted.

  The connecting portion 29 'includes four screw holes 29H and two connectors 29C. One connector 29C is disposed on each of a surface substantially orthogonal to the width direction D1 and a surface substantially orthogonal to the height direction. The four screw holes 29H are arranged one by one at four locations across the connector 29C in the thickness direction D2. Of the four screw holes 29H, the screws 50 are inserted into the two screw holes 29H in the height direction D3, and the screws 50 are inserted into the remaining two screw holes 29H in the width direction D1.

  For example, when the battery modules 20 are arranged side by side in the height direction D3, the connection portion 29 provided on the upper surface side of the lower battery module 20 and the connection portion provided on the bottom surface side of the upper battery module 20 29 are arranged facing each other. By arranging the two connection portions 29 side by side, a recess that is recessed in a substantially rectangular parallelepiped shape in the width direction D1 is formed.

  FIG. 6 shows an example of the configuration of the fixing member 40 ′. The fixing member 40 ′ is a substantially rectangular parallelepiped plate. The fixing member 40 ′ has screw holes 42 arranged in the vicinity of each of the four corners of the plate body, and two connectors 44 arranged side by side in a direction substantially perpendicular to the longitudinal direction at the center in the longitudinal direction of the plate body. And. The longitudinal direction of the connector 44 is arranged so as to be substantially parallel to the longitudinal direction of the plate.

  The fixing member 40 ′ has a shape that fits into the recesses of the two connecting portions 29 arranged side by side. When the fixing member 40 ′ and the recesses of the two connecting portions 29 are attached so as to be fitted, the screw hole 29H of the connecting portion 29 ′ and the screw hole 42 of the fixing member 40 ′ communicate with each other, and the connector 29C The connector 44 is electrically connected. The fixing member 40 'positions and fixes the two battery modules 20 with the screws 50 inserted into the screw holes 42 and 29H, and the two battery modules 20 connect the two connectors 44 of the fixing member 40' internally. The wiring is electrically connected.

  In this manner, by attaching the fixing member 40 ′ to the connection portions 19 ′ and 29 ′, the control unit 10 and the battery modules 20 </ b> A, 20 </ b> B, and 20 </ b> C can be fixed and positioned with respect to each other. Similarly, between the connection portion 19 ′ of the control unit 10 and the connection portion 29 ′ of the battery module 20 is electrically connected by the wiring that connects the two connectors 44 of the fixing member 40 ′ inside. A control signal from the control unit 10 can be transmitted to each battery module 20.

  FIG. 7 shows a configuration example of the battery module 20. The housing 2 of the battery module 20 includes a door 28 that opens and closes in the thickness direction D2. The door 28 is provided with a vent hole 26. A plurality of cell modules BT including a plurality of secondary battery cells are accommodated in the housing 2 of the battery module 20. The plurality of cell modules BT are regularly arranged in the width direction D1, the thickness direction D2, and the height direction D3. The plurality of cell modules BT arranged in the thickness direction D2 are arranged on a common slide plate 24 that slides in the thickness direction D2.

When replacing the cell module BT, the slide plate 24 on which the target cell module BT is arranged is slid, the target cell module BT is taken out, and a new cell module is placed on the slide plate 24.
When the cell module BT is taken out from the slide plate 24, the cell modules BT before and after the taken out cell module BT are connected. For example, the cell modules BT before and after the taken-out cell module BT are connected by an energization line via a switching unit, and when the target cell module is taken out, the cell unit BT is energized by the switching unit. The switching means may be, for example, means for electrically switching the connection, or may be means for mechanically switching the connection.

  As described above, when the cell module BT is taken out, it is possible to continue the operation of other cell modules BT even when the target cell module BT is replaced by providing means for connecting the preceding and following cell modules BT. It is possible to suppress an increase in characteristic variation.

  FIG. 8 shows a configuration example of the slide plate 24. The slide plate 24 has a substantially rectangular parallelepiped plate provided with screw holes 24H disposed in the vicinity of the four corners, and a connector 24C disposed at an end portion in a direction substantially orthogonal to the longitudinal direction (thickness direction D2). And.

  The plate body of the slide plate 24 includes a convex portion protruding from an end portion in a direction substantially orthogonal to the longitudinal direction. The convex portion has a triangular prism shape in which the cross section substantially orthogonal to the longitudinal direction is a triangle, and the connector 24C is disposed on the central surface in the longitudinal direction.

  When the plurality of cell modules BT are arranged on the slide plate 24, the plurality of cell modules BT and the slide plate 24 are fixed by screws 52 inserted into the screw holes 24H. The plurality of cell modules BT include a connector (not shown) provided at a position facing the connector 24C.

  By connecting the connector 24C of the slide plate 24 and the connectors of the plurality of cell modules BT as described above, for example, a control signal is sent from the control unit 10 to a circuit board (not shown) that manages the plurality of cell modules BT. In addition to being supplied via the slide plate 24, data such as voltages and temperatures of the plurality of cell modules BT can be transmitted to the control unit 10 via the slide plate 24.

Next, the structure for cooling said electrical storage system is demonstrated.
FIG. 9 shows an example of a configuration for air-cooling the power storage system. The housing 2 of the battery module 20 includes an exhaust part 20H that penetrates in the height direction D3. The exhaust part 20H is a space penetrating in the height direction D3 along the wall facing the door of the housing 2 of the battery module 20. The exhaust part 20H communicates with the space between the cell modules BT. The air that has flowed into the housing 2 from the vent 26 provided in the housing 2 of the battery module 20 passes between the cell modules BT and hits the wall of the housing 2 facing the door 28 in the height direction D3. It is guided and discharged to the upper part of the housing 2 through the exhaust part 20H. Here, the air flowing into the housing 2 from the vent hole 26 may be forced to flow in by a fan (not shown) disposed in the vent hole 26 of the door 28 of the battery module 20.

  In FIG. 10, an example of the structure which air-cools the control unit 10 is shown. The housing 1 of the control unit 10 includes an exhaust part 10H penetrating in the height direction D3. The exhaust unit 10 </ b> H communicates with the space in the cooling unit 12, the space in the AC / DC conversion unit 14, and the space in the DC / DC conversion unit 16. The exhaust part 10H is a space penetrating in the height direction D3 along the wall on the back side of the casing 1 of the control unit 10. The cooling unit 12 of the control unit 10 includes an exhaust fan 122 that discharges the air in the housing 1 to the outside. The exhaust fan 122 blows air so as to exhaust air from the vent 18 provided in the upper part of the housing 1.

  When the exhaust fan 122 is driven, air flows from the opening of the exhaust unit 10H on the bottom side of the control unit 10, and the space in the DC / DC conversion unit 16, the space in the AC / DC conversion unit 14, and the cooling Air circulates through the space in the portion 12 and is discharged from the vent hole 18.

  As described above, when the exhaust portions 20H and 10H are provided in the casing 2 of the battery module 20 and the casing 1 of the control unit 10, it becomes possible to arrange electrical wiring in the spaces of the exhaust portions 20H and 10H, and the rear side It is not necessary to provide a space in the space. Also, front maintenance management can be realized.

  FIG. 11 illustrates an example of a configuration in which the power storage system is air-cooled when the control unit 10 and the battery module 20 are arranged side by side in the height direction D3. When the control unit 10 is placed on the battery module 20, the exhaust part 20H of the battery module 20 and the exhaust part 10H of the control unit 10 are continuous.

  When the exhaust fan 122 of the control unit 10 is driven, air is sucked into the casing 2 of the battery module 20 from the vent hole 26 of the battery module 20, and the air passes between the cell modules BT to reach the exhaust unit 20H. To the exhaust part 10H, circulates through the space in the DC / DC conversion part 16, the space in the AC / DC conversion part 14, and the space in the cooling part 12, and is discharged from the vent hole 18.

  As described above, when the exhaust portions 20H and 20H are provided in the casing 2 of the battery module 20 and the casing 1 of the control unit 10, the battery module 20 and the control unit 10 are arranged side by side in the height direction D3. In addition, the heat source in the cell module BT and the control unit 10 can be air-cooled. In the above example, the configuration in which air is exhausted from the housings 1 and 2 has been described. However, a configuration in which air is sucked into the housings 1 and 2 may be used.

Next, an example of a configuration for water-cooling the power storage system will be described.
FIG. 12 shows a configuration example of the control unit 10 and the battery module 20. The control unit 10 includes a cooling unit 12 including a plurality of water pumps and a plurality of switches for switching power supply to each of the plurality of water pumps, an AC / DC conversion unit 14, and a DC / DC conversion unit 16. And the overall control device 30. The overall control device 30 may be disposed, for example, in the AC / DC conversion unit 14 of the housing 1 of the control unit 10 or may be disposed outside the housing 1.

  The overall control device 30 includes a control unit 32 and a communication unit 34. The communication unit 34 acquires battery information of each battery module 20 by communication and supplies the battery information to the control unit 32. The control unit 32 determines the charge / discharge amount to each battery module 20 based on the battery information received from the communication unit 34 and controls the operation of the cooling unit 12. The control unit 32 performs overall control (load variation control, peak cut, etc.) of the entire power storage system based on information / commands from the sensor SS (or EMS) or the like.

  The cooling unit 12 includes an exhaust fan 122, a heat exchanger (radiator) 124, a first water pump 126, a second water pump 128, a switch SWA for switching power supply to the first water pump 126, a second And a switch SWB for switching the power supply to the water pump 128. The operations of the switches SWA and SWB are controlled by the control unit 32. In addition, although the cooling part 12 provided with 2 units | sets of water pumps is described as an example in FIG. 12, the water pump of the cooling unit 12 is not limited to 2 units | sets, and is provided with 3 or more units | sets of water pumps. It may be.

  The AC / DC conversion unit 14 includes a bidirectional inverter 142, a control unit 144 that controls the operation of the bidirectional inverter 142, and a communication unit 146 that communicates with the overall control device 30 and the DC / DC conversion unit 16. Yes.

  The control unit 144 of the AC / DC conversion unit 14 receives the communication command transmitted from the overall control device 30 from the communication unit 146, controls the bidirectional inverter 142, and connects the AC line to the power distribution system. Power conversion is performed between the DC / DC converter 16 and a common DC line connected to the DC / DC converter 16.

  The DC / DC converter 16 includes DC / DC converters 16A, 16B, and 16C corresponding to the number of battery modules 20. Each of the DC / DC converters 16A, 16B, and 16C includes a voltage conversion unit 162, a control unit 164, and a communication unit 166.

  The DC / DC converters 16A, 16B, and 16C control the voltage conversion unit 162 based on a communication command from the overall control device 30 or the AC / DC conversion unit 14, and the common DC line and the battery modules 20A, 20B, and 20C side The battery modules 20A, 20B, and 20C are charged and discharged by voltage step-up / step-down with the DC line.

  Battery module 20A, 20B, 20C is provided with the battery management part (BMU: Battery Management Unit) 200 and the secondary battery BTU containing several cell module BT. Although omitted in FIG. 12, the battery modules 20B and 20C have the same configuration as the battery module 20A except that the battery modules 20B and 20C include a secondary battery BTU of a different type from the battery module 20A. For example, the battery module 20A includes a cell module BT of a lithium ion battery as the secondary battery BTU, the battery module 20B includes a cell module BT of a nickel metal hydride battery as the secondary battery BTU, and the battery module 20C is lead as the secondary battery BTU. A battery cell module BT is provided.

  The battery management unit 200 includes a control unit 202 that controls the secondary battery BTU, a communication unit 204 that communicates with the DC / DC conversion unit 16, a voltage, current, temperature, SOC (state of charge) of the secondary battery BTU, And a management unit 206 that manages battery information such as internal resistance and charge / discharge integrated current.

  The battery management unit 200 controls the secondary battery BTU based on the communication command from the DC / DC conversion unit 16 to charge / discharge the battery. In addition, information managed by the management unit 206 is transmitted to the host to detect abnormality or life of the secondary battery BTU.

  In the storage battery system, the cooling water discharged from the first water pump 126 and the second water pump 128 circulates through the bidirectional inverter 142, the voltage converter 162, and the heat exchanger 124 of the AC / DC converter 14, It returns to the 1st water pump 126 and the 2nd water pump 128 again. The cooling water passing through the heat exchanger 124 is cooled by the exhaust fan 122 and then supplied to the first water pump 126 and the second water pump 128.

The overall control device 30 calculates a heat generation amount from the communication unit 34 that communicates with the AC / DC conversion unit 14 and information acquired from the communication unit 34. When the heat generation amount is larger than a threshold value, the overall control device 30 sets a plurality of switches SWA and SWB. And a control unit 32 that controls the plurality of switches SWA and SWB to supply power to at least one of the plurality of water pumps 126 and 128 when the heat generation amount is less than the threshold value. The control unit 32 of the overall control device 30 switches between the operation and stop of the first water pump 126 and the second water pump 128 according to the heat generation amount of the power storage system.
In addition, the control unit 32 of the overall control device 30 calculates the lifespan of the plurality of water pumps 126 and 128 from the operating status of the plurality of water pumps 126 and 128, and sets the plurality of switches SWA and SWB according to the calculation result. Open and close, and select one that operates from a plurality of water pumps 126 and 128.

  FIG. 13 shows an example of operation control of the first water pump 126 and the second water pump 128 by the control unit 32. The control unit 32 calculates the heat generation amount of the power storage system from the information acquired from the AC / DC conversion unit 14 and the DC / DC conversion unit 16 and the operation status. When the calorific value of the power storage system is larger than the threshold value, the control unit 32 closes both the switch SWA and the switch SWB, and operates both the first water pump 126 and the second water pump 128, so that the AC / DC The amount of cooling water discharged to the conversion unit 14 and the DC / DC conversion unit 16 is increased. When the power generation amount of the power storage system is equal to or less than the threshold value, control unit 32 closes switch SWA or switch SWB and operates one of first water pump 126 and second water pump 128.

  A thermal sensor may be attached to the bidirectional inverter 142 of the AC / DC converter 14 or the voltage converter 162 of the DC / DC converters 16A to 16B, and the detection result may be transmitted to the controller 32 by communication. . In that case, when the received detection result is larger than the threshold value, the control unit 32 operates both the first water pump 126 and the second water pump 128 and the received detection result is less than the threshold value. In some cases, one of the first water pump 126 and the second water pump 128 is operated. As described above, the first water pump 126 and the second water pump 128 are intermittently operated, so that the use period can be made longer than the continuous operation.

  Further, the control unit 32 monitors the operating time of the first water pump 126 and the second water pump 128 from the information acquired from the AC / DC conversion unit 14 and the DC / DC conversion unit 16, and the first water pump 126 and the first water pump 126. 2 The life of the water pump 128 is managed. When the lifetimes of the first water pump 126 and the second water pump 128 are long, the control unit 32 equalizes the frequency of using the first water pump 126 and the second water pump 128 and does not bias the lifetime. Like that. When the lifetimes of the first water pump 126 and the second water pump 128 are shortened, only one of them is used, and control is performed so that the lifetime is not lost at the same time. Therefore, both pumps can be prevented from stopping at the same time, and cooling can be continued during maintenance.

  FIG. 14 shows another example of the configuration of the control unit 10 and the battery module 20. In the example illustrated in FIG. 14, the cooling unit 12 further includes a water temperature detection unit 121 and a water temperature display unit 123. The water temperature detection unit 121 detects the temperature of the cooling water discharged from the DC / DC conversion unit 16 and outputs the detection result to the water temperature display unit 123 and the communication unit 34. The water temperature display unit 123 displays the received detection result as a numerical value or an image. The communication unit 34 transmits the received detection result to a user or the like. When the water temperature is displayed in this way, it is possible to notify the user of abnormality or the like of the power storage system.

  As described above, according to the power storage system according to the present embodiment, the arrangement position of the control unit and the battery module can be easily changed according to the arrangement space, and the storage capacity can be easily changed by changing the combination. It is possible to provide an electricity storage system capable of

  Further, according to the power storage system according to the present embodiment, even when the arrangement position and the power storage capacity are changed, the heat generated in the system can be effectively air-cooled or water-cooled, thus ensuring safety. A power storage system can be provided. Furthermore, by combining air cooling and water cooling as described above, a portion that is not cooled by water cooling can also be cooled by air cooling.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. For example, a power storage system that performs only the above-described air cooling or a power storage system that performs only water cooling may be used. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  BT ... cell module, SS ... sensor, SWA ... switch (first switch), SWB ... switch (second switch), DC ... common, 1 ... casing (first casing), 2 ... casing (second casing) Body), 10 ... control unit, 10H ... exhaust part (first exhaust part), 12 ... cooling part, 12. AC ... cooling unit, 14 ... DC conversion unit, 16 ... DC conversion unit, 16 (16A to 16C) ... DC / DC converter, 18 ... ventilation port, 19, 29, 19 ', 29' ... connection unit, 20 ( 20A, 20B, 20C) ... battery module, 20H ... exhaust part (second exhaust part), 22 ... switching part, 24 ... slide plate, 24H ... screw hole, 24C ... connector, 26 ... vent, 28 ... door, 29H ... Screw hole (second screw hole), 29C ... Connector (second connector), 30 ... Overall control device, 32 ... Control unit, 34 ... Communication unit, 40, 40 '... Fixing member, 42 ... Screw hole (third Screw holes), 44 ... Connectors (third connector, fourth connector), 50 ... Screw, 52 ... Screw, 121 ... Water temperature detection unit, 122 ... Exhaust fan, 123 ... Water temperature display unit, 124 ... Heat exchanger (radiator) 126 ... 1st water pump, 12 2nd water pump, 142 ... Bidirectional inverter, 144 ... Control unit, 146 ... Communication unit, 162 ... Voltage conversion unit, 164 ... Control unit, 166 ... Communication unit, 200 ... Battery management unit (BMU), 202 ... Control , 204 ... communication unit, 206 ... management unit.

Claims (9)

A battery module comprising a plurality of cell modules, and a second housing containing the plurality of cell modules;
An AC / DC converter that outputs an alternating current to the distribution system and converts the alternating current obtained from the distribution system into a direct current and outputs the direct current, and the direct current output from the AC / DC converter has a predetermined magnitude. A DC / DC converter that converts the direct current output from the battery module into a direct current of a predetermined magnitude and outputs the direct current to the AC / DC converter. An overall control device that controls the operation of the AC / DC conversion unit and the DC / DC conversion unit, the AC / DC conversion unit, the DC / DC conversion unit, and the overall control device, A power storage system comprising: a control unit including a first housing having a size common to the two housings.   The power storage system according to claim 1, wherein the first casing and the plurality of second casings can be attracted and fixed by magnetic force. A fixing member for fixing the first housing and the second housing;
The first housing has at least two first screw holes into which screws are inserted in a direction in which the first housing and the second housing are arranged and in a direction orthogonal to the thickness direction of the first housing; A first connector disposed between the first screw holes,
The second casing includes at least two second screw holes into which screws are inserted in a direction in which the first casing and the second casing are arranged and in a direction orthogonal to the thickness direction of the second casing; A second connector disposed between the second screw holes,
The fixing member includes a plurality of third screw holes that are screwed in communication with the first screw hole and the second screw hole; a third connector that is electrically connected to the first connector; 2. A power storage system according to claim 1, further comprising a fourth connector electrically connected to the second connector, wherein the third connector and the fourth connector are electrically connected inside.   2. The power storage system according to claim 1, wherein the second housing further includes a door capable of exposing an inside, and a slide plate on which the plurality of cell modules are fixed and slides toward the door.   The second casing further includes a vent provided in a wall extending in a height direction thereof, and a tunnel-shaped second exhaust part penetrating in the height direction along a wall facing the wall. The power storage system according to claim 1. The first casing has a first exhaust part disposed so as to be continuous with the second exhaust part when penetrating in the height direction and disposed on the second casing, and an exhaust provided on an upper surface. With a mouth,
The power storage system according to claim 5, wherein the control unit further includes a cooling unit including a fan that discharges air inside the first housing to the exhaust port. The control unit includes a water pump that discharges cooling water to the AC / DC conversion unit, a heat exchanger into which cooling water discharged from the DC / DC conversion unit flows, the heat exchanger, and the first housing. A cooling unit that is disposed between an exhaust port provided on the upper surface of the body and exhausts air from the heat exchanger side to the exhaust port side,
The power storage system according to claim 1, wherein the cooling water discharged from the water pump circulates through the AC / DC converter and the DC / DC converter. The control unit includes a plurality of the water pumps and a plurality of switches for switching power supply to each of the plurality of water pumps,
The overall control device calculates a heat generation amount from a communication unit that communicates with the AC / DC conversion unit, and information acquired from the communication unit, and closes the plurality of switches when the heat generation amount is larger than a threshold value. The power storage system according to claim 7, further comprising: a control unit that controls the plurality of switches to supply power to at least one of the plurality of water pumps when an amount is equal to or less than the threshold value. The control unit includes a plurality of water pumps, a plurality of switches for switching power supply to each of the plurality of water pumps,
The overall control device calculates the lifespan of the plurality of water pumps from the operating status of the plurality of water pumps, and opens and closes the plurality of switches according to the result of the calculation, and operates from the plurality of water pumps. The power storage system according to claim 7, further comprising a control unit that selects what is to be performed.

Images