JP2019176534A - Storage battery system - Google Patents

Abstract

To provide a storage battery system capable of securing stability of an installation state.SOLUTION: A storage battery system 10 comprises a housing 11, a plurality of storage battery modules 12, and a power conversion unit 13. The plurality of storage battery modules 12 are arranged on the lower side of the housing 11. The power conversion unit 13 comprises a power conversion circuit 37 arranged on the upper side of the housing 11, and a transformer 39 arranged on the lower side of the housing 11 and connected with the power conversion circuit 37.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a storage battery system.

  2. Description of the Related Art Conventionally, there are storage battery systems that are connected to, for example, a power generation system including a solar power generation module or the like, or a system power supply that supplies commercial power. This power storage system is configured to store the power generated by the solar power generation system or to store the power at times when the system power supply is cheap, such as at night, to supply the stored power to the load when necessary. Has been.

  In such a storage battery system, there is an integrated storage battery system that integrally includes a plurality of storage battery modules and a power conversion unit that performs power conversion.

  In this integrated storage battery system, a plurality of storage battery modules and a power conversion unit are housed in a housing, but since the storage battery module is large and has a large mass, it is disposed on the lower side of the housing, and the power conversion unit is It is often arranged on the upper side of the casing that is above the storage battery module.

  In the power conversion unit, a transformer is used for power conversion. However, a large-sized and large-mass transformer is used because the power to be converted is large. If this large transformer is also arranged on the upper side of the housing above the storage battery module, the center of gravity of the storage battery system becomes high, and the stability in the installed state of the storage battery system may be impaired.

JP 2018-7435 A

  The problem to be solved by the present invention is to provide a storage battery system capable of ensuring the stability of the installation state.

  The storage battery system of the embodiment includes a housing, a plurality of storage battery modules, and a power conversion unit. The plurality of storage battery modules are arranged on the lower side of the housing. The power conversion unit includes a power conversion circuit disposed on the upper side of the housing and a transformer disposed on the lower side of the housing and connected to the power conversion circuit.

  According to the storage battery system of the embodiment, it can be expected to ensure the stability of the installation state.

It is a perspective view of the state which removed the front cover of the storage battery system which shows a 1st embodiment. It is a cross-sectional perspective view of a part of the same storage battery system. It is a perspective view of a storage battery system same as the above. It is a perspective view of the state which removed the front cover of the storage battery system which shows a 2nd embodiment. It is a cross-sectional perspective view of a storage battery system same as the above. It is a perspective view of the state which removed the front cover of the storage battery system which shows a 3rd embodiment. It is a cross-sectional perspective view of a storage battery system same as the above. It is a perspective view of a storage battery system same as the above. It is a perspective view of the state which removed the front cover of the storage battery system which shows 4th Embodiment. It is a cross-sectional perspective view of a storage battery system same as the above. It is a perspective view of the back side of a storage battery system same as the above.

  Hereinafter, a first embodiment will be described with reference to FIGS. 1 to 3.

  The storage battery system 10 is installed in, for example, a general house, and stores, for example, the power of the system power supply by converting from AC to DC, and stores this stored power from DC to AC and supplies it to the load when necessary. It is configured.

  The storage battery system 10 includes a housing 11, a plurality of storage battery modules 12 housed in the housing, and a power conversion unit (power conditioner) 13.

  The casing 11 is formed in a rectangular parallelepiped shape in which the horizontal dimension and the vertical dimension are larger than the longitudinal dimension.

  The housing 11 includes a main body portion 16 that is an inner frame, and a cover body 17 that is an outer frame that covers the main body portion 16.

  The main body portion 16 includes a bottom plate 18, side plates 19 on both sides in the width direction, and a plurality of frame members 20 that connect the front and rear portions and the upper portion between the side plates 19 on both sides, and are assembled in a frame shape.

  The cover body 17 includes a bottom cover 21 that covers the bottom surface of the main body portion 16, a top cover 22 that covers the top surface of the main body portion 16, a front cover 23 that covers the front surface of the main body portion 16, a back cover 24 that covers the back surface of the main body portion 16, and A side cover 25 that covers both side surfaces of the main body 16 is provided. These covers 21 to 25 cover the entire main body 16 and have a waterproof structure in which joint portions are combined in a liquid-tight manner. A pedestal 26 for installing the storage battery system 10 at a predetermined location is attached to the bottom cover 21.

  Wiring ports 19a and 25a are formed at intermediate positions in the vertical direction of the side plate 19 on the right side of the main body 16 and the side cover 25 on the right side. A duct cover 27 is attached to the side cover 25 on the right side surface so as to cover the wiring port 25a. The lower surface side of the duct cover 27 is opened and communicated with the wiring port 25a. A wiring connection portion 28 connected to the power conversion unit 13 is arranged inside the wiring port 19a. For example, wiring for connecting to a distribution board to which a system power supply and a load are connected is inserted into the wiring ports 19a and 25a from the lower surface side of the duct cover 27 and connected to the wiring connection portion.

  A storage battery module storage area 29 in which a plurality of storage battery modules 12 are arranged is provided in a lower area in the housing 11, and a transformer storage area 30 is provided on the right side of the storage battery module storage area.

  An upper storage area 31 in which the main part of the power conversion unit 13 is arranged is formed in the upper area in the housing 11.

  The storage battery module 12 includes a storage battery main body 34 formed in a rectangular parallelepiped shape that is long in the vertical direction, a terminal block 35 provided on the upper portion of the storage battery main body 34, and the like. For the storage battery main body 34, for example, a rechargeable secondary battery such as a lithium ion battery is used. The plurality of storage battery modules 12 are arranged in the storage battery module storage area 29 of the housing 11 and are electrically connected to the power conversion unit 13 by wiring connected to the terminal block 35.

  Further, the power conversion unit 13 converts, for example, the power of the system power supply from alternating current to direct current and stores it in the storage battery module 12, and converts the electric power stored in the storage battery module 12 from direct current to alternating current and supplies it to the load when necessary. To do. The power conversion unit 13 includes a plurality of substrates 38 constituting a power conversion circuit 37 such as a converter that converts AC power into DC power and an inverter that converts DC power into AC power. The power conversion circuit includes a transformer 39 for converting a single-phase two-wire system into a single-phase three-wire system. The transformer 39 is the largest and has a larger mass than the other components included in the power conversion unit 13.

  The substrate 38 of the power conversion unit 13 is disposed in the upper storage area 31 of the housing 11, and the transformer 39 is disposed in the transformer storage area 30 on the lower side of the housing 11. In the transformer storage area 30, a transformer storage box 40 for storing the transformer 39 is installed. The transformer storage box 40 includes a box portion 41 having an upper surface opened and a lid portion 42 detachably attached to the upper surface of the box portion 41.

  Further, the storage battery system 10 includes an exhaust device 45 for exhausting heat generated by the transformer 39 to the outside of the housing 11. The exhaust device 45 uses a gap that exists between the side plate 19 on the right side surface of the housing 11 and the side cover 25 on the right side surface as the exhaust passage 46. The lower end side of the exhaust passage 46 communicates with a communication port 47 provided on the upper side of the transformer storage box 40, and the upper end side of the exhaust passage 46 communicates with the outside of the housing 11 through the wiring port 25a and the duct cover 27. Yes. A vent 48 communicating with the inside of the housing 11 is provided on the side surface of the box portion 41.

  When the transformer 39 generates heat during the operation of the storage battery system 10, the air heated by the heat of the transformer 39 in the transformer storage box 40 by natural convection flows into the communication port 47, the exhaust passage 46, the wiring port 25a and The air is exhausted outside the housing 11 through the inside of the duct cover 27. The air in the housing 11 flows into the transformer storage box 40 through the vent 48, cools the transformer 39, and the air heated by the heat of the transformer 39 in the transformer storage box 40 is as described above. Exhausted outside.

  In the storage battery system 10 of the first embodiment, the large transformer 39 having a large mass is not disposed on the upper side in the housing 11 together with the substrate 38 of the power conversion unit 13 or the like. By arranging it on the side of the storage battery module 12 on the lower side of 11, the center of gravity can be lowered, and the stability during installation can be ensured.

  Furthermore, the heat generated by the transformer 39 by the exhaust device 45 can be exhausted to the outside of the casing 11, and the temperature rise of the transformer 39 can be suppressed.

  Moreover, since the exhaust device 45 uses the clearance existing between the side plate 19 on the right side surface of the housing 11 and the side cover 25 on the right side surface, the wiring port 25a and the duct cover 27 as the exhaust passage 46, it is easy to use. Can be configured.

  Next, FIG. 4 and FIG. 5 show a second embodiment.

  The configuration of the exhaust device 45 is different from that of the first embodiment. The exhaust device 45 includes an exhaust duct 51 that communicates with the outside of the housing 11 at the top of the transformer storage box 40. The side cover 25 is provided with an exhaust port 52 below the wiring port 25a and inside the duct cover 27. The side plate 19 is also provided with an opening facing the exhaust port 52. The upper end side of the exhaust duct 51 communicates with the exhaust port 52.

  When the transformer 39 generates heat during operation of the storage battery system 10, the air heated by the heat of the transformer 39 in the transformer storage box 40 due to natural convection flows into the exhaust duct 51, the exhaust port 52, and the duct cover 27. The air is exhausted to the outside of the housing 11. The air in the housing 11 flows into the transformer storage box 40 through the vent 48, cools the transformer 39, and the air heated by the heat of the transformer 39 in the transformer storage box 40 is as described above. Exhausted outside.

  And also in the storage battery system 10 of 2nd Embodiment, the effect similar to 1st Embodiment is obtained.

  Moreover, the exhaust device 45 can efficiently exhaust the air heated by the transformer 39 to the outside of the housing 11 by using the exhaust duct 51 as the exhaust passage 46.

  Next, FIGS. 6 to 8 show a third embodiment.

  The configuration of the exhaust device 45 is different from that of the first embodiment. The exhaust device 45 includes a lower exhaust duct 55 attached to the upper portion of the transformer storage box 40, and an upper exhaust duct 56 that communicates with the upper portion of the lower exhaust duct 55 and communicates with the outside of the housing 11 at the upper end. Prepare. The side cover 25 is provided with an exhaust port 57 above the wiring port 25a, and an exhaust port cover 58 is attached to the exhaust port 57. The side plate 19 is also provided with an opening facing the exhaust port 57. The upper end side of the upper exhaust duct 51 is communicated with the exhaust port 57. The exhaust port cover 58 is configured to prevent intrusion of rainwater and the like while ensuring air permeability.

  When the transformer 39 generates heat during the operation of the storage battery system 10, the air heated by the heat of the transformer 39 in the transformer storage box 40 by natural convection becomes the lower exhaust duct 55, the upper exhaust duct 56, the exhaust The air is exhausted to the outside of the housing 11 through the port 57 and the exhaust port cover 58. The air in the housing 11 flows into the transformer storage box 40 through the vent 48, cools the transformer 39, and the air heated by the heat of the transformer 39 in the transformer storage box 40 is as described above. Exhausted outside.

  And also in the storage battery system 10 of 3rd Embodiment, the effect similar to 1st Embodiment is obtained.

  Moreover, the exhaust device 45 efficiently exhausts the air heated by the transformer 39 to the outside of the housing 11 by guiding the air heated by the transformer 39 by the exhaust ducts 55 and 56 to the upper part of the housing 11 and exhausting it. Can be exhausted.

  Next, a fourth embodiment is shown in FIGS.

  The rear cover 24 of the housing 11 is provided with an intake port 61 and an intake port cover 62 that covers the intake port 61, and an exhaust port 63 and an exhaust port cover 64 that covers the exhaust port 63. . The intake port cover 62 and the exhaust port cover 64 are configured to prevent intrusion of rainwater or the like while ensuring air permeability.

  The casing 11 cools a heat generating component 65 of the power conversion unit 13 such as a plurality of switching elements such as a field effect transistor that performs power conversion, and a plurality of reactors that smooth and boost the pulsating flow of power to be converted. A cooling device 66 is provided. The cooling device 66 is provided with two air passages 67 and 68 from the intake port 61 to the exhaust port 63 in the housing 11. Fans 69 and 70 are disposed in the air passages 67 and 68, respectively, and a heat generating component 65 is disposed.

  Further, a transformer 39 is disposed in a storage battery module storage area 29 provided on the lower side in the housing 11. Of each storage position where the storage battery module 12 in the storage battery module storage area 29 is disposed, for example, the transformer 39 is disposed at a storage position where the storage battery module 12 at the center on the back side can be disposed. The storage battery module 12 that is originally arranged at the storage position at the center on the back side in the storage battery module storage area 29 is arranged on the right inner side of the housing 11. The transformer 39 is stored in a transformer storage box 40 that is disposed at a storage position in the center on the back side in the storage battery module storage region 29.

  Further, the exhaust device 45 includes an exhaust duct 71 attached to an upper portion of the transformer storage box 40. The upper portion of the exhaust duct 71 communicates with the air passage 68 and also communicates with the exhaust port 63 through the air passage 68.

  When the transformer 39 generates heat during the operation of the storage battery system 10, the air heated by the heat of the transformer 39 in the transformer storage box 40 by natural convection is discharged into the exhaust duct 71, the air passage 68, the exhaust port 63, and The air is exhausted to the outside of the housing 11 through the exhaust port cover 64. The air in the housing 11 flows into the transformer storage box 40 through the vent 48, cools the transformer 39, and the air heated by the heat of the transformer 39 in the transformer storage box 40 is as described above. Exhausted outside.

  Since the inside of the air passage 68 is blown by the fan 70 toward the exhaust port 63, the air in the exhaust duct 71 flows together toward the exhaust port 63, that is, the air in the exhaust duct 71 is sucked from the upper end opening. The suction force acts, and the air heated by the heat of the transformer 39 in the transformer storage box 40 is sucked out.

  And also in the storage battery system 10 of 4th Embodiment, the effect similar to 1st Embodiment is acquired.

  Moreover, the exhaust device 45 is configured simply by exhausting the air heated by the heat of the transformer 39 to the outside of the housing 11 using the air passage 68 and the exhaust port 63 provided in the storage battery system 10. be able to.

  Further, since the exhaust duct 71 communicates with the air passage 68 that is blown by the fan 70 toward the exhaust port 63, the air heated by the heat of the transformer 39 is sucked out from the exhaust duct 71, and the efficiency is increased. It can exhaust well.

  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 spirit of the invention. 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.

10 Storage battery system
11 Enclosure
12 Battery module
13 Power converter
29 Storage module storage area
37 Power conversion circuit
39 transformer
45 Exhaust system

Claims (3)

A housing;
A plurality of storage battery modules disposed on the lower side of the housing;
A power conversion circuit disposed on the upper side of the housing; and a power conversion unit having a transformer disposed on the lower side of the housing and connected to the power conversion circuit;
A storage battery system comprising: The housing has a storage battery module storage region for storing a plurality of the storage battery modules,
The storage battery system according to claim 1, wherein the transformer is disposed in the storage battery module storage region. The storage battery system according to claim 1, further comprising an exhaust device that exhausts heat generated by the transformer to the outside of the housing.

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