JP2023134863A - Electric power conversion system and power storage system - Google Patents

Abstract

To provide an electric power conversion system capable of efficiently cooling heating components forming a power converter, and to provide a power storage system.SOLUTION: An electric power conversion system includes: a first housing which houses electronic components forming a power converter; and a second housing which houses the first housing. The first housing and the second housing are arranged so that a cooling passage for cooling the first housing is formed between the first housing and the second housing.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a power conversion device and a power storage system.

BACKGROUND ART A power storage system is known that is connected to a power grid and can supply power once stored in a storage battery to a load via a power conversion device during a power outage or the like. A power storage system is also known that is connected to a solar power generation system and stores generated power (for example, surplus power) that exceeds the power supplied to a load. In a power conversion device included in such a power storage system, a structure is known that cools heat generated by semiconductor switching elements, reactors, and the like used in the power conversion circuit.

Patent Document 1 listed below discloses a power conversion device that can reduce the thermal influence from heat-generating components to other components of a power conversion circuit. The heat-generating components are specifically switching elements and reactors, which generate a larger amount of heat than other components constituting the power conversion circuit, and are preferably cooled. This power conversion device includes a housing, a power conversion unit housed within the housing, and a cooling device that cools heat-generating components included in the power conversion unit. The housing includes a main case, a front cover placed on the front side of the main case, and a back case placed on the back side of the main case. The main case has a box shape with an open front side, and houses the power conversion circuit of the power conversion section. The back case is also box-shaped with an open front side, and accommodates a plurality of heat generating components (reactors).

The cooling device for a power conversion device disclosed in Patent Document 1 includes a reactor cooling unit and a switching element cooling unit separately. The reactor cooling unit includes an air passage member that accommodates a plurality of reactors, and an intake fan that is disposed at one of the left and right ends of the air passage member. This fan cools the reactor by causing air taken in from a slit-shaped vent hole formed on the side surface of the back case to flow through the vent path member. The switching element cooling unit includes a heat dissipation component (ie, a fin portion), an air passage member, and a fan. With this fan, air is taken in from the slit-shaped vent formed on the side of the rear case and flows through the air passage member, thereby cooling the heat dissipation component to which the switching element is attached, thereby cooling the switching element. .

Japanese Patent Application Publication No. 2019-165549

In the power conversion device disclosed in Patent Document 1, the cooling device is housed in the rear case, and air flow is limited to the rear surface, so there is a problem that the cooling capacity is insufficient. Power converters are often installed outdoors, and for example, when the power converter receives direct sunlight, the surface temperature of the power converter increases due to solar heat, and the heat infiltrates the power converter. The main case disclosed in Patent Document 1 is open on the front side, and when the front cover becomes hot due to sunlight, the heat is transmitted to the inside of the main case, and the heat generating parts of the power converter (i.e., switching elements and reactors) are transmitted to the inside of the main case. is not cooled sufficiently. In addition, in the battery system disclosed in Patent Document 1 in which a power conversion device and a storage battery are housed in one housing, heat from heat-generating components is transferred to the storage battery, and the storage battery becomes high temperature and may be damaged. There is.

Therefore, an object of the present disclosure is to provide a power converter device and a power storage system that can efficiently cool heat-generating components that constitute a power converter.

A power conversion device according to an aspect of the present disclosure includes a first casing that accommodates electrical components that constitute a power converter, and a second casing that accommodates the first casing. The two casings are arranged such that a cooling flow path for cooling the first casing is formed between the first casing and the second casing.

A power storage system according to another aspect of the present disclosure includes the power converter described above and a storage battery, and the power converter converts output power of the storage battery into AC power and outputs the AC power.

According to the present disclosure, it is possible to provide a power converter and a power storage system that can efficiently cool heat generating components that constitute a power converter.

FIG. 1 is a perspective view showing the external appearance of a power storage system according to an embodiment of the present disclosure as viewed from the front. FIG. 2 is a perspective view showing the appearance of the power storage system shown in FIG. 1 when viewed from the back. FIG. 3 is a rear view of the power storage system shown in FIG. 1 with the back panel removed. FIG. 4 is a vertical sectional view showing the IV-IV cross section of the electricity storage system shown in FIG. FIG. 5 is a horizontal sectional view showing the VV cross section of the power storage system shown in FIG. FIG. 6 is a horizontal sectional view showing air flow by a fan inside the power storage system shown in FIG. FIG. 7 is a vertical sectional view showing air flow by a fan inside the power storage system shown in FIG. 1. FIG. FIG. 8 is a horizontal sectional view showing a power storage system according to a modification.

[Description of embodiments of the present disclosure]
First, the contents of the embodiment of the present disclosure will be listed and explained. At least some of the embodiments described below may be combined arbitrarily.

(1) A power conversion device according to a first aspect of the present disclosure includes a first casing that accommodates electrical components constituting a power converter, a second casing that accommodates the first casing, and a second casing that accommodates the first casing. The first casing and the second casing are arranged such that a cooling flow path for cooling the first casing is formed between the first casing and the second casing. Thereby, it is possible to efficiently reduce the temperature rise on the wall surface of the first casing due to the heat generated by the electrical components included inside the first casing, and it is possible to cool the electrical components included inside the first casing. Therefore, abnormalities and failures of the power converter can be suppressed.

(2) The cooling flow path may be formed along the entire circumference of the first housing. Thereby, it is possible to suppress the heat from the electrical components included inside the first casing from being transmitted to the member disposed between the first casing and the second casing. In particular, since the cooling channel is formed along the bottom surface of the first housing, when the storage battery is placed below the first housing in the second housing, the electricity contained inside the first housing is Heat from the components can be suppressed from being transmitted to the storage battery.

(3) The power conversion device may further include a first cooling fan for forming an air flow in the cooling channel. Thereby, it is possible to more efficiently reduce the temperature rise on the wall surface of the first casing due to the heat generated by the electrical components included inside the first casing, and it is possible to efficiently cool the electrical components included inside the first casing.

(4) The power conversion device may further include a second cooling fan, and the second cooling fan may be provided within the first housing. Thereby, air can be circulated inside the first casing to prevent specific components from becoming hot, and heat generated by the electrical components can be efficiently transmitted to the wall surface of the first casing. Therefore, the inside of the first casing can be efficiently cooled, and the electrical components can be cooled.

(5) The power conversion device may further include a heat generating component that constitutes the power converter, and the heat generating component may be provided on the outer surface of the first casing. Thereby, the heat generating components can be directly cooled by the airflow, and the temperature rise inside the first housing can be suppressed.

(6) The power conversion device may further include a heat dissipation component, and the heat dissipation component may be provided on the outer surface of the first casing. Thereby, the surface of the first casing can be cooled, and a rise in temperature inside the first casing can be suppressed.

(7) The cooling flow path may include a first flow path and a flow path other than the first flow path, and the first flow path includes a heat generating component that constitutes the power converter and a first housing. At least one of the heat dissipation components provided on the outer surface of the body may be provided, and the pressure loss in the first flow path may be smaller than the pressure loss in the flow paths other than the first flow path. Thereby, it is possible to further suppress the temperature rise inside the first casing due to the heat generating components.

(8) The first housing may be of a closed type. Thereby, it is possible to prevent water and dust from entering the inside of the first casing.

(9) A power storage system according to a second aspect of the present disclosure includes any of the power conversion devices described above and a storage battery, and the power converter converts the output power of the storage battery into AC power and outputs the AC power. Thereby, it is possible to efficiently reduce the temperature rise on the wall surface of the first casing due to the heat generated by the electrical components included inside the first casing, and it is possible to cool the electrical components included inside the first casing. Therefore, abnormalities and failures of the power converter can be suppressed, and power can be safely supplied from the storage battery.

[Details of embodiments of the present disclosure]
In the following embodiments, the same parts are given the same reference numbers. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

(overall structure)
Referring to FIG. 1, a power storage system 100 according to an embodiment of the present disclosure includes a first housing 102, a partition plate 106, a storage battery module 200, and a second housing 104 that accommodates them. The partition plate 106 divides the inside of the second housing 104 into two regions. The first housing 102 is arranged in an area above the partition plate 106, and one or more storage battery modules 200 are arranged in an area below the partition plate 106. The storage battery module 200 includes a secondary battery that can be charged and discharged (hereinafter referred to as charge/discharge). The first housing 102 includes a power converter (for example, a power conditioner) that controls charging and discharging of the storage battery module 200. Note that in the space 300, electrical wiring for connecting the power converter and the storage battery module 200, a switch, a battery management system (none of which are shown), etc. are arranged.

The second housing 104 includes a front panel 110, a back panel 112, a top panel 114, a left side panel 116, a right side panel 118, and a bottom panel 120, and is formed into a substantially rectangular parallelepiped. As described later, the first casing 102 houses therein a control board, a power conversion board, etc. for controlling the charging/discharging operation of the storage battery module 200, and is located above the partition plate 106 of the power storage system 100. constitutes a power converter.

Since the power storage system 100 can be installed outdoors, the first casing 102 has an intake port and an exhaust port for exchanging internal air and external air in order to prevent rainwater, dust, etc. from entering. It is formed into a closed type without any To make it a sealed type, a sealing member (for example, packing, etc.) can be used to fill the gap. Note that "closed type" includes, but is not limited to, a completely sealed structure, and also includes a structure in which there is a certain degree of air movement between the inside and outside of the casing due to gaps or through holes, etc. include. For example, a connector to which wiring for connecting the control board and power conversion board included in the first housing 102 and the storage battery module 200 is connected is arranged on the external surface (for example, the bottom surface) of the first housing 102. ing.

The orthogonal axes are shown in the lower left of FIG. 1 (the same applies to FIG. 2 and subsequent figures). The X, Y, and Z axes represent axes perpendicular to the front panel 110, left side panel 116, and top panel 114, respectively. The positive direction of the X-axis is the direction from the back to the front of the power storage system 100, the positive direction of the Y-axis is the direction from the left side to the right side of the power storage system 100, and the positive direction of the Z-axis is the direction from the back to the front of the power storage system 100. This is the direction from the bottom of the system 100 to the top.

Power storage system 100 may include legs (not shown) on the lower side of bottom panel 120. In the power storage system 100, the bottom panel 120 is normally fixed to a horizontal surface (including a substantially horizontal surface, for example, a surface parallel to the XY plane). Thereby, the front panel 110, the back panel 112, the left side panel 116, and the right side panel 118 are arranged vertically (including substantially vertically, for example, in the Z-axis direction). The front panel 110, the back panel 112, the top panel 114, the partition plate 106, the right side panel 118, and the bottom panel 120 are made of conductive members having a predetermined strength, such as metal (iron (steel), stainless steel, etc.). The surface is coated with an insulating material.

Referring to FIG. 2, power storage system 100 includes a first air blower 130 disposed on back panel 112 and an opening 132 formed in back panel 112. The first blower 130 is, for example, a fan, and includes a rotary blade and a drive device (for example, a motor) that rotates the rotary blade, and blows air in the direction of the rotation axis by rotating the rotary blade around the rotation axis. . The first blower 130 exhausts the air inside the second housing 104 to the outside of the second housing 104. Opening 132 functions as an intake port. That is, as the air inside the second housing 104 is exhausted by the first blower 130, the air outside the second housing 104 flows into the inside of the second housing 104 through the opening 132. Although three first air blowers 130 are shown in FIG. 2, the present invention is not limited thereto. At least one first air blower 130 may be disposed on the back panel 112.

An air filter may be disposed in the opening 132 to prevent dust and the like from entering the second housing 104. Further, a non-sealing cover (not shown) having an opening may be disposed on the back panel 112 to cover the first air blower 130 and the opening 132. The cover prevents people from directly touching the first air blower 130 and the opening 132, and prevents rainwater, dust, etc. from entering the second housing 104 from the first air blower 130 and the opening 132.

Referring to FIG. 3 showing the back side of the power storage system 100 with the back panel 112 removed, a first heat generating component 210, a second heat generating component 212, and a heat dissipating component 214 are installed on the back surface of the first housing 102. It is located. The first heat generating component 210 and the second heat generating component 212 are, for example, reactors (for example, AC reactors), are connected to a board housed in the first housing 102, and are used to realize charge/discharge operations of the storage battery module 200. Used for power conversion.

The heat dissipation component 214 is, for example, a heat sink. The heat dissipation component 214 is formed of a highly thermally conductive member such as aluminum, iron, copper, or the like. As will be described later, a power conversion switching element (specifically, a case of a semiconductor switching element) housed in the first housing 102 is fixed to the heat dissipation component 214. During power conversion, a large current (for example, several tens of amperes) flows through the switching element, and the switching element generates heat. The heat of the switching element is transferred to the heat dissipation component 214, and the heat dissipation component 214 radiates the heat to its surroundings (that is, heat conduction to the surrounding air, infrared radiation, etc.), and the temperature of the air near the heat dissipation component 214 increases. That is, the switching element housed in the first housing 102 is cooled by the heat dissipation component 214 .

The size and position of the heat dissipation component 214 on the first housing 102 are not limited to those shown in FIG. 2, but are arbitrary. The size and position of the heat dissipation component 214 on the first casing 102 may be determined in accordance with the arrangement of switching elements and reactors (that is, heat generating components) for realizing the power conversion function described later.

The first housing 102 is fixed on the partition plate 106 via spacers 134 and 136. That is, the bottom surface of the first casing 102 is separated from the partition plate 106, and a space 302 is formed between the bottom surface of the first casing 102 and the partition plate 106 (distance L1). Furthermore, each of the five surfaces of the first casing 102 excluding the bottom surface is spaced apart from the corresponding inner wall of the second casing 104, and there is also space between the inner walls of the first casing 102 and the second casing 104. A space is formed. Specifically, a space 304 is formed between the top surface of the first housing 102 and the top panel 114 (distance L2). A space 306 is formed between the left side of the first housing 102 and the left side panel 116 (distance L3), and a space 308 is formed between the right side of the first housing 102 and the right side panel 118 (distance L4). is formed. Furthermore, as will be described later, a space 310 and a space 312 (see FIG. 4) are formed on the front and back surfaces of the first housing 102, respectively.

As will be described later, when the back panel 112 is attached, the space 312 between the back of the first housing 102 and the back panel 112 (FIG. (see). As a result, the air whose temperature has increased around the first heat generating component 210, the second heat generating component 212, and the heat dissipating component 214 is discharged to the outside of the second casing 104, and relatively low temperature air flows in from the opening 132. do. Due to such air flow, the first heat generating component 210, the second heat generating component 212, and the heat radiating component 214 are cooled, and the heat dissipating efficiency of the heat radiating component 214 is improved.

Referring to FIGS. 4 and 5, the first housing 102 includes a first substrate 220, a second substrate 222, a third heat generating component 224, a fourth heat generating component 226, and a second air blower 228. The first substrate 220, the second substrate 222, the third heat generating component 224, and the fourth heat generating component 226 constitute a power converter. The first board 220, the second board 222, and the second air blower 228 are fixed inside the first housing 102 by predetermined fixing members (not shown). The third heat generating component 224 and the fourth heat generating component 226 are fixed to the first housing 102 (that is, the back surface thereof) at positions corresponding to the heat dissipating component 214, for example, by screws or the like. If an opening is formed at a position corresponding to the heat radiating component 214 on the back surface of the first casing 102, the third heat generating component 224 and the fourth heat generating component 226 can be directly fixed to the heat radiating component 214. Note that when an opening is formed on the back surface of the first casing 102, the airtightness of the first casing 102 is maintained as long as the opening is covered by the heat dissipation component 214.

The first board 220 is, for example, a control board and includes a control circuit. The second board 222 is, for example, a power conversion board, and includes a circuit (that is, a DC/DC converter and a DC/AC converter) for realizing a power conversion function. 4 and 5, electrical components on the first substrate 220 and the second substrate 222 are not shown. The third heat generating component 224 and the fourth heat generating component 226 are components for realizing a power conversion function. The third heat generating component 224 is, for example, a switching element (for example, a FET (Field Effect Transistor)), and the fourth heat generating component 226 is, for example, a reactor (for example, a DC reactor).

The second blower 228 is a fan like the first blower 130, and blows air in a direction perpendicular to the plane of the drawing in FIG. The air blown by the second air blower 228 forms a flow of air that circulates inside the first housing 102, as will be described later. The first substrate 220 , the second substrate 222 , the third heat generating component 224 , and the fourth heat generating component 226 are objects to be cooled by the air blown by the second blower 228 .

As described above, the first housing 102 housed in the second housing 104 is not in direct contact with any of the panels or partition plate 106 of the second housing 104, and there is no space between them. is formed. That is, a space 310 is formed between the front surface of the first casing 102 and the front panel 110 (distance L5), and a space 310 is formed between the back surface of the first casing 102 and the back panel 112 (distance L6). A space 312 is formed.

As described above, electrical wiring and the like are arranged in the space 300 (see FIG. 1) below the power storage system 100 (the area below the partition plate 106). For example, electrical wiring for connection with an external power source and an external load is provided in the space 300 via an opening (or a bushing attached to the opening) for passing electrical wiring provided in the back panel 112. Connected to a terminal block (not shown). Thereby, the power storage system 100 stores power (that is, DC power) supplied from an external power source (for example, a solar power generation system) via the electrical wiring in the storage battery module 200 . When the storage battery module 200 is discharging, the power storage system 100 transmits the power (i.e., AC power) converted by the second board 222 controlled by the first board 220 to an external load (for example, electrical equipment) via electrical wiring. supply Note that when AC power is supplied to the power storage system 100 from an external power source, the second board 222 is controlled by the first board 220, converts the input AC power into DC power, and stores the power in the storage battery module 200. .

(motion)
With reference to FIGS. 6 and 7, the cooling operation (i.e., air blowing by the first air blower 130 and the second air blower 228) during the power conversion operation (i.e., charging/discharging operation) of the power storage system 100 will be described. Note that in FIG. 7, the internal structure of the first housing 102 is not illustrated. During power conversion operation, the second board 222 operates under the control of the first board 220, and a large current flows through the first heat generating component 210, the second heat generating component 212, the third heat generating component 224, and the fourth heat generating component 226. . Along with this, the first air blower 130 and the second air blower 228 start blowing air. The first air blower 130 and the second air blower 228 blow air, for example, by controlling the power supply to the first air blower 130 and the second air blower 228 by the first board 220.

When the first air blower 130 starts blowing air (that is, exhausting air), air outside the power storage system 100 flows into the space 312 from the opening 132. That is, as shown by the solid arrow, an air flow is formed along the back surface of the first housing 102 , and the air that has flowed in from the opening 132 is exhausted to the outside of the power storage system 100 from the first blower 130 . In this way, the space 312 formed by the back surface of the first housing 102 and the back panel 112 plays the role of a path (hereinafter referred to as a cooling channel) through which the air flowing in from the opening 132 flows. That is, a cooling flow path is formed on the back surface of the first housing 102. Therefore, the air whose temperature has increased around the first heat generating component 210, the second heat generating component 212, and the heat radiating component 214 is discharged to the outside of the power storage system 100, and relatively low temperature air flows in through the opening 132. The first heat generating component 210, the second heat generating component 212, and the heat radiating component 214 are cooled by such air flow.

In addition, the air flowing in from the opening 132 flows along the right side, front side, and left side of the first housing 102 (i.e., flows through the spaces 308, 310, and 306), as shown by the dashed arrows. Air is exhausted from the first blower 130 to the outside of the power storage system 100 . In addition, referring to FIG. 7, the air flowing in from the opening 132 flows along the bottom, front, and top surfaces of the first casing 102 (i.e., the space 302, (flows through space 310 and space 304) and is exhausted to the outside of power storage system 100 from first blower 130. That is, a cooling channel through which air flowing from the opening 132 flows is formed around the entire circumference (that is, all the outer surfaces) of the first housing 102.

As will be described later, heat generated inside the first housing 102 is transmitted to the front, rear, top, bottom, left and right surfaces of the first housing 102, and is transmitted from each surface of the first housing 102 to the outside of the first housing 102. (including radiation). The air around the first casing 102, whose temperature has increased due to the heat transferred from each surface of the first casing 102, is cooled by cooling channels formed around the entire circumference of the first casing 102. 102 and exhausted to the outside of power storage system 100 from first blower 130 . In addition, relatively low temperature air flows in through the opening 132, and the flowed air is transported by a cooling channel formed around the entire circumference of the first casing 102. Therefore, the efficiency of heat radiation from each surface of the first casing 102 can be improved, and the inside of the first casing 102 can be efficiently cooled.

As described above, the power conversion operation of the power storage system 100 mainly generates heat in the first heat generating component 210, the second heat generating component 212, the third heat generating component 224, and the fourth heat generating component 226. As described above, the heat generated by the third heat generating component 224 and the fourth heat generating component 226 is mainly transmitted to the heat radiating component 214 and radiated. At this time, the cooling flow path formed in the space 312 improves the heat radiation efficiency of the heat radiation component 214.

On the other hand, part of the heat generated by the electrical components mounted on the first board 220 and the second board 222 and the heat generated by the third heat-generating component 224 and the fourth heat-generating component 226 are removed by the air blown by the second blower 228. The air flow generated inside the first housing 102 is transmitted to each surface of the first housing 102 . Specifically, referring to FIG. 6, as shown by the dashed-dotted arrow, the second air blower 228 forms a flow of air that circulates inside the first casing 102. As a result, the heat inside the first casing 102 is diffused to the surroundings, transmitted to each surface of the first casing 102, and is radiated from each surface of the first casing 102. At this time, as described above, the cooling flow path formed around the entire circumference of the first casing 102 can improve the heat radiation efficiency from each surface of the first casing 102, and the cooling inside the first casing 102 can be improved. Can be promoted. Therefore, the temperature rise of the heat-generating components is suppressed, and deterioration and damage to the heat-generating components can be avoided.

As described above, in the power storage system 100, the circuits and electrical components responsible for the power conversion function are housed in the first housing 102, the first housing 102 is housed in the second housing 104, and the first housing 102 and the second housing A cooling channel is formed between the casings 104. Thereby, it is possible to efficiently reduce the temperature rise on the wall surface of the first housing 102 due to heat generated by the electrical components included inside the first housing 102, and the electrical components included inside the first housing 102 can be cooled.

In addition, in the power storage system 100, spacers 134 and 136 are arranged under the first casing 102 so that all the outer surfaces of the first casing 102 do not come into direct contact with the inner wall of the second casing 104. A cooling flow path is formed around the entire circumference of one housing 102. Thereby, heat from the electrical components included inside the first housing 102 can be suppressed from being transmitted to members disposed between the first housing 102 and the second housing 104. In particular, by forming the cooling flow path along the bottom surface of the first casing 102, it is possible to suppress heat from electrical components included inside the first casing 102 from being transmitted to the storage battery module 200. .

Further, a first air blower 130 is disposed on the back panel 112 of the power storage system 100, and an opening 132 is formed. As a result, air flow can be formed in the cooling channel formed between the first casing 102 and the back panel 112, and the first casing 102 is heated by the electric components included inside the first casing 102. Temperature rise on the wall surface can be reduced more efficiently. Therefore, the electrical components included inside the first housing 102 can be efficiently cooled. As shown in FIG. 3, if the heat dissipation component 214 is arranged on the back surface of the first housing 102, the heat dissipation efficiency can be improved. Further, the first heat generating component 210 and the second heat generating component 212 arranged on the back surface of the first housing 102 can be directly cooled by the airflow.

In the power storage system 100, a second air blower 228 is arranged inside the first housing 102. As a result, air can be circulated inside the first casing 102 to prevent specific components from becoming hot, and heat generated by electrical components can be efficiently transmitted to the wall surface of the first casing 102. Heat dissipation from each surface of the body 102 can be promoted. Therefore, the inside of the first housing 102 can be efficiently cooled, and the electrical components can be cooled.

As described above, the upper and lower parts of the power storage system 100 are separated by the partition plate 106. The partition plate 106 is formed into a flat plate shape. Therefore, there is almost no air flow between the upper and lower parts of power storage system 100 with partition plate 106 as a boundary. It can also be considered that the front panel 110, the back panel 112, the top panel 114, the left side panel 116, and the partition plate 106 form a sealed casing in the upper part of the power storage system 100. That is, heat generated in the upper part of power storage system 100 is suppressed from being transmitted to storage battery module 200 arranged in the lower part. Note that a relatively small opening may be formed in the partition plate 106 for passing a wire harness for connecting the first substrate 220 and the second substrate 222 to the storage battery module 200. Even in such a case, since the flow of air between the upper and lower parts of power storage system 100 is small, heat generation in the upper part of power storage system 100 is suppressed from being transmitted to storage battery module 200 as described above.

When the power storage system 100 is installed outdoors, the temperature of the power storage system 100 increases not only due to heat generation during power conversion but also due to solar radiation. That is, when sunlight irradiates each surface of the second housing 104 (specifically, the front panel 110, the back panel 112, the top panel 114, the left side panel 116, and the right side panel 118), the second housing The temperature of each surface of the second housing 104 increases, and thereby heat is transferred to the inside of the second housing 104. However, the power storage system 100 has a double housing structure, and spaces 302 to 312 are formed between the first housing 102 and the second housing 104, and the first air blower 130 blows air. A cooling channel through which air flows is formed. Therefore, it is possible to suppress the temperature rise on each surface of the second casing 104 from being transmitted to the first casing 102, and the electrical components housed in the first casing 102 are prevented from being affected by solar radiation in the second casing. 104 can be reduced.

As described above, the air flowing in from the opening 132 flows through the cooling channel formed around the entire circumference of the first housing 102 . In the space 312, a first heat generating component 210, a second heat generating component 212, and a heat dissipating component 214 are arranged. Therefore, it is preferable that more air flowing in from the opening 132 flows into the cooling channel (hereinafter referred to as the first cooling channel) formed in the space 312 than in other cooling channels. That is, it is preferable that the pressure loss in the first cooling channel formed in the space 312 is smaller than the pressure loss in the other cooling channels. For this purpose, for example, the cross-sectional area of the first cooling channel may be increased. For example, the position of the first housing 102 within the second housing 104 may be determined so that the interval L6 is larger than any of the intervals L1 to L5. Thereby, it is possible to further suppress the temperature rise inside the first casing 102 due to the heat generating components.

As described above, the first housing 102 employs a closed type housing. Thereby, it is possible to suppress intrusion of water, dust, etc. from the outside, and to prevent deterioration and damage to the board and electrical components inside the first casing 102.

(Modified example)
Although the case where the first heat generating component 210 and the second heat generating component 212 are arranged outside the first housing 102 has been described above, the present invention is not limited to this. Referring to FIG. 8, in a power storage system 150 according to a modification, a first housing 152 accommodates a first heat generating component 210 and a second heat generating component 212 therein. In other respects, power storage system 150 is configured similarly to power storage system 100. 8, components with the same reference numerals as those in FIG. 5 have the same functions as the power storage system 100. That is, similarly to the power storage system 100, the power storage system 150 has a closed first housing 152 and a second housing 104 that accommodates the first housing 152, so that the first air blower 130 blows air (that is, exhausts air). A cooling channel through which air flows is formed around the entire circumference of the first housing 152. Therefore, as described above, the heat dissipation efficiency from each surface of the first housing 152 can be improved, and cooling inside the first housing 152 can be promoted. Therefore, the temperature rise of the heat generating components inside the first housing 152 is suppressed, and deterioration and damage to the heat generating components can be avoided.

Note that even if the same cooling flow path is formed in the power storage system 100 and the power storage system 150, the first heat generating component 210 and the second heat generating component 212 are arranged outside the first housing 102 in the power storage system 100. Therefore, the heat radiation efficiency of the first housing 102 is greater than the heat radiation efficiency of the first housing 152.

Further, at least one of a heat generating component and a heat dissipating component may be disposed on the back surface of the first casing 102 of the power storage system 100. That is, at least one of a heat generating component and a heat radiating component may be disposed in the first cooling channel formed in the space 312. The air flowing through the first cooling channel can efficiently cool the disposed components, and further suppress the temperature rise inside the first housing.

Although the case where the heat-generating components are a reactor and a switching element has been described above, the present invention is not limited thereto. Any element may be used as long as it is an element that is disposed inside and on the outer surface of the first housing 102, generates heat during operation of the power storage system 100, and is damaged if not cooled. Such an element is a heat generating component and is subject to cooling.

Although the case where the power conversion device includes two first substrates 220 and second substrates 222 has been described above, the present invention is not limited to this. The first substrate 220 and the second substrate 222 may be formed integrally (ie, as one substrate). The first substrate 220 and the second substrate 222 may be formed as three or more substrates.

In the above, a case has been described in which the storage battery module 200 is arranged below the first housing 102 and both are housed in the second housing 104, but the present invention is not limited to this. For example, the storage battery module 200 may be disposed on one of the left and right sides of the first housing 102, and the first housing 102 and the storage battery module 200 may be housed in the second housing 104. In that case, by arranging a partition plate vertically between the first housing 102 and the storage battery module 200, it is possible to suppress the heat generated by the heat generating components inside the first housing 102 from being transmitted to the storage battery module 200.

Although the present invention has been described above by describing the embodiments, the above-described embodiments are merely examples, and the present invention is not limited to the above-described embodiments. The scope of the present invention is indicated by each claim, with reference to the description of the detailed description of the invention, and all changes within the scope and meaning equivalent to the words described therein are defined. include.

100, 150 Energy storage system 102, 152 First housing 104 Second housing 106 Partition plate 200 Storage battery module 110 Front panel 112 Back panel 114 Top panel 116 Left side panel 118 Right side panel 120 Bottom panel 130 First blower 132 Openings 134, 136 Spacer 210 First heat generating component 212 Second heat generating component 214 Heat dissipating component 220 First board 222 Second board 224 Third heat generating component 226 Fourth heat generating component 228 Second blower 300, 302, 304, 306, 308 , 310, 312 Space L1, L2, L3, L4, L5, L6 Interval

Claims (9)

a first casing that accommodates electrical components constituting the power converter;
a second casing that accommodates the first casing;
The first casing and the second casing are arranged such that a cooling flow path for cooling the first casing is formed between the first casing and the second casing. power conversion equipment. The power conversion device according to claim 1, wherein the cooling flow path is formed along the entire circumference of the first casing. The power conversion device according to claim 1 or 2, further comprising a first cooling fan for forming an air flow in the cooling channel. further including a second cooling fan;
The power conversion device according to claim 1 , wherein the second cooling fan is provided within the first housing. further including a heat generating component constituting the power converter,
The power conversion device according to any one of claims 1 to 4, wherein the heat generating component is provided on an outer surface of the first casing. further includes heat dissipation components,
The power conversion device according to any one of claims 1 to 5, wherein the heat dissipation component is provided on an outer surface of the first casing. The cooling channel includes a first channel and a channel other than the first channel,
The first flow path is provided with at least one of a heat generating component constituting the power converter and a heat dissipating component provided on the outer surface of the first casing,
The power conversion device according to any one of claims 1 to 5, wherein the pressure loss in the first flow path is smaller than the pressure loss in flow paths other than the first flow path. The power conversion device according to any one of claims 1 to 7, wherein the first housing is of a closed type. The power conversion device according to any one of claims 1 to 8,
including a storage battery,
The power converter is a power storage system that converts the output power of the storage battery into AC power and outputs the AC power.

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