Energy storage device

Abstract

The utility model relates to an energy storage device, and the device comprises a box body which is provided with a containing cavity with an opening in one side, the containing cavity is divided into an electrical cabin and a temperature control cabin in the vertical direction, and the opening is divided into a plurality of cabin openings which are sequentially arranged in the horizontal direction; the first stand columns are arranged between the two adjacent hatch openings; the door body is hinged to the box body, the door body is used for opening or covering the hatch openings so as to control the electrical cabin and the temperature control cabin to be opened and closed, one door body correspondingly covers n hatch openings, n is larger than or equal to 1, and the door body is provided with a closing position for covering the hatch openings; a cutting face is formed on the side, opposite to the containing cavity, of the first stand column, a first sealing piece is arranged on the first stand column, and at the closing position, a first blow-by port communicating the electrical cabin with the temperature control cabin is formed between the door body and the cutting face and used for sealing the first blow-by port. The problem of mutual blow-by between the electrical cabin and the temperature control cabin after the stand column in the energy storage device is cut is solved, and the use safety of the energy storage device is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device. Background Art

[0002] Building an electrochemical energy storage power station typically requires the centralized deployment of a large number of electrochemical energy storage devices. Existing energy storage devices typically utilize a containerized structure for ease of transportation and centralized deployment. The containerized structure includes vertically arranged battery compartments and temperature control compartments, along with doors that seal the hatches.

[0003] In the existing technology, in order to save costs, a widened door body is often used, that is, one door corresponds to multiple rows of battery compartments and electrical compartments, and in order to avoid the pillars between adjacent battery compartments / temperature control compartments from interfering with the door body, the pillars will be cut, which will cause gaps between the pillars and the door body, thereby causing the battery compartment and the electrical compartment to leak air to each other, thereby posing a safety risk. Utility Model Content

[0004] The present application provides an energy storage device, which aims to solve the problem of gas leakage between the battery compartment and the electrical compartment due to the cutting of the columns on the box body.

[0005] In a first aspect, an embodiment of the present application provides an energy storage device, comprising:

[0006] The box body is provided with a receiving cavity with an opening on one side, the receiving cavity is divided into an electrical compartment and a temperature control compartment along the vertical direction, and the opening is divided into a plurality of hatches arranged in sequence along the horizontal direction;

[0007] A first column is provided between two adjacent hatches;

[0008] a door body hinged to the box body, the door body being used to open or close the hatches, thereby controlling the opening and closing of the electrical compartment and the temperature control compartment, wherein one door body covers n hatches, n ≥ 1, and the door body has a closed position for covering the hatches;

[0009] A cutting surface is formed on the side of the first column facing away from the accommodating cavity, and a first sealing member is provided on the first column. In the closed position, a first air port connecting the electrical compartment and the temperature control compartment is formed between the door body and the cutting surface, and the first sealing member is used to seal the first air port.

[0010] In some embodiments, the first sealing member extends from the upper end of the first pillar to the lower end of the first pillar.

[0011] In some embodiments, the first sealing member is a sealing strip, and a first cutting edge and a second cutting edge are formed at both ends of the first column in the width direction. The first cutting edge and the second cutting edge are located on the side of the first column facing away from the accommodating cavity, and the sealing strip is sleeved on the first cutting edge and the second cutting edge.

[0012] In some embodiments, an elastic edge is provided on the sealing strip. When the door body is in the closed position, the sealing strip forms an abutting surface that abuts against the first column. The elastic edge is located on both sides of the abutting surface. An angle is formed between the elastic edge and the sealing strip, and the elastic edge elastically abuts against the door body.

[0013] In some embodiments, the angle between the elastic edge and the abutting surface is α, and 120°≤α≤180°.

[0014] In some embodiments, a first cutting edge and a second cutting edge are formed at both ends of the first column in the width direction, a slot is formed between the first cutting edge and the second cutting edge, and the first sealing member is clamped in the slot.

[0015] In some embodiments, a partition is provided in the accommodating cavity, and the partition divides the accommodating cavity into the electrical compartment and the temperature control compartment in the vertical direction. A third sealing member is provided on the partition. In the closed position, a third air port is formed between the door body and the partition, and the third sealing member is used to seal the third air port.

[0016] In some embodiments, the upper and lower ends of the partition close to the door body are provided with extensions, and the third sealing member is sleeved on the extensions.

[0017] In some embodiments, the accommodating cavity is further provided with a plurality of partitions arranged at intervals along the horizontal direction, and the plurality of partitions divide the accommodating cavity into a plurality of compartments, and the compartments are provided in a one-to-one correspondence with the hatches.

[0018] In some embodiments, there are multiple door bodies, and the multiple door bodies are arranged adjacent to each other in the horizontal direction, and the multiple door bodies are used together to cover the opening.

[0019] Compared with the existing technology, this technical solution has at least the following technical effects:

[0020] In the technical solution of the present application, one door body can cover multiple hatches, which is beneficial to reducing the cost of the energy storage device; and by arranging a first seal on the first column to seal the first air inlet, the problem of air leakage between the electrical compartment and the temperature control compartment after the column in the energy storage device is cut is solved, thereby improving the safety of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic structural diagram of an energy storage device in one embodiment of the present application;

[0023] Figure 2 yes Figure 1 Schematic diagram of the internal structure;

[0024] Figure 3 yes Figure 2 A magnified view of part A;

[0025] Figure 4 yes Figure 2 Schematic diagram of the split structure;

[0026] Figure 5 yes Figure 4 A magnified view of part B;

[0027] Figure 6 yes Figure 5 Schematic diagram of the structure of the first seal.

[0028] Reference numerals:

[0029] 100 Energy storage device 110 Cabinet 111 Accommodation cavity <![CDATA[111a1]]> Electrical compartment <![CDATA[111a2]]> Temperature Control Cabin 1111 cabin 1111a hatch 11111 First cabin 11112 Second cabin 121 cut off 1211 Mounting Block 12111 First installation position 12112 Second installation position 122 partition 1221 Yanbian 1222 The third seal 130 First pillar 130a card slot 131 First cutting edge 132 Second cutting edge 133 First seal 1331 Elastic Edge 140 Second pillar 141 hinges 150 Door 151 door handle 152 vents DETAILED DESCRIPTION

[0030] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0032] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0033] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0034] This application proposes an energy storage device 100 .

[0035] In the implementation of this application, the types of energy storage devices 100 include:

[0036] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0037] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of the household energy storage device 100 is equivalent to the user providing a backup power supply for himself and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0038] In the embodiments of the present application, the energy storage device 100 may have a rectangular parallelepiped or cube-shaped structure. Applications of the energy storage device 100 include, but are not limited to, at least one of a power battery, a fuel cell, and a supercapacitor. Power batteries include, but are not limited to, lithium-ion batteries, nickel-metal hydride batteries, and supercapacitors. The following describes the energy storage device 100 in detail using a rectangular parallelepiped as an example.

[0039] See also Figures 1-6 For ease of description, the length direction of the energy storage device 100 is defined as the X-axis direction, the width direction of the energy storage device 100 is defined as the Y-axis direction, and the height direction of the energy storage device 100 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0040] The directional terms such as “upper”, “lower”, “top”, “bottom”, “left”, “right”, “front” and “back” used in the description of the energy storage device 100 in this embodiment are mainly based on the position of the battery pack in the attached Figure 1 The display orientation is explained in the figure, with the positive direction of the Z axis being the "top" and "upper", the negative direction of the Z axis being the "bottom" and "lower", the positive direction of the X axis being the "right", the negative direction of the X axis being the "left", the positive direction of the Y axis being the "back", and the negative direction of the Y axis being the "front", which does not constitute a limitation on the orientation of the energy storage device 100 in actual application scenarios.

[0041] See also Figure 1 、 Figure 2 and Figure 4 In this embodiment, the energy storage device 100 includes a box body 110 and a door body 150; the box body 110 is provided with a accommodating chamber 111 with an opening on the front side, and the accommodating chamber 111 is divided along the Y-axis direction to form an electrical compartment 111a1 and a temperature control compartment 111a2, and the electrical compartment 111a1 is arranged above the temperature control compartment 111a2; the door body 150 is hinged on the box body 110, and the door body 150 is used to open or close the opening, thereby controlling the opening and closing of the electrical compartment 111a1 and the temperature control compartment 111a2.

[0042] In this embodiment, the opening is divided into a plurality of hatches 1111a arranged in sequence along the X-axis direction, and the accommodating chamber 111 is provided with m (m is a positive integer) partitions 121 arranged at intervals along the X-axis direction. These partitions 121 divide the accommodating chamber 111 into m+1 cabins 1111, and the cabins 1111 are arranged in a one-to-one correspondence with the hatches 1111a, wherein the cabin 1111 includes a first cabin 11111 and a second cabin 11112 separated into upper and lower parts, the electrical cabin 111a1 is composed of m+1 first cabins 11111, and the temperature control cabin 111a2 is composed of m+1 second cabins 11112. The partition 121 includes a plurality of columns arranged in sequence along the Y-axis direction and mounting seats 1211 provided on the left and right sides of the columns. The mounting seats 1211 extend along the Y-axis direction. The mounting seats 1211 have a first mounting position 12111 and a second mounting position 12112 arranged front to back. There are multiple mounting seats 1211, and the multiple mounting seats 1211 are arranged in sequence along the Z-axis direction.

[0043] In this embodiment, the energy storage device 100 also includes multiple battery clusters and a temperature control module. The temperature control module is arranged in the temperature control compartment 111a2, that is, the temperature control module is arranged in the second compartment 11112, for controlling the temperature of the battery modules in the electrical compartment 111a1; multiple battery clusters are all arranged in the electrical compartment 111a1, wherein two battery clusters are arranged in a first compartment 11111, and the battery clusters include multiple battery modules connected in series and parallel. The battery modules of the two battery clusters in the first compartment 11111 are respectively installed on the first installation position 12111 and the second installation position 12112.

[0044] In the prior art, the front side of the box 110 typically has a door corresponding to one compartment, with columns between two adjacent compartments 1111 serving as the frame for the corresponding door. However, to save costs, a widened door is often used, meaning one door corresponds to multiple compartments 1111. To prevent the columns between adjacent compartments 1111 from interfering with the door, some of the columns are cut. However, this can create gaps between the door and the cut columns when closed, potentially allowing air to cross between the electrical compartment 111a1 and the temperature control compartment 111a2, posing a safety risk.

[0045] See also Figure 1 and Figure 2 In order to solve the above technical problems, in the energy storage device 100 provided in this embodiment, a door body 150 is used to cover n hatches 1111a, where n≥1; the energy storage device 100 also includes a first column 130 (i.e., the column cut above), which extends along the Z-axis direction and is arranged at the front end of the partition 121. The first column 130 is arranged between two adjacent hatches 1111a, and a cutting surface is formed on the front side of the first column 130 (the side facing away from the accommodating cavity 111). A first air connection port connecting the electrical compartment 111a1 and the temperature control compartment 111a2 is formed between the cutting surface and the covering position of the door body 150 (i.e., when the door body 150 is covered, a first air connection port is formed between the door body 150 and the first column 130). A first sealing member 133 is provided on the first column 130, and the first sealing member 133 is used to seal the first air connection port.

[0046] In the technical solution of the present application, one door body 150 can cover a plurality of hatches 1111a, which is beneficial to reducing the cost of the energy storage device 100. By providing a first seal 133 on the first column 130 to seal the first air connection port, the problem of air connection between the electrical compartment 111a1 and the temperature control compartment 111a2 after the column in the energy storage device 100 is cut is solved, thereby improving the safety of the energy storage device 100.

[0047] In this embodiment, the front side of the housing 110 is provided with multiple doors 150, arranged sequentially along the X-axis. The doors 150 collectively cover the opening formed by the multiple hatches 1111a. The doors 150 can be single-opening or double-opening, and each door 150 is provided with a door handle 151. The doors 150 have an open position, which opens the hatches 1111a, and a closed position, which closes the hatches 1111a. The doors 150 also have a vent 152 that communicates with the electrical compartment 111a1. The vent 152 is provided with a shutter. When the door 150 is closed, the shutter can be controlled to open and close, allowing the electrical compartment 111a1 to communicate with the outside world. The vent 152 also has a filter, located on the side of the shutter facing away from the electrical compartment 111a1, to filter impurities from the outside air.

[0048] Continue reading Figure 1 and Figure 2 In this embodiment, the energy storage device 100 further includes a second column 140 (an uncut column). The second column 140 is disposed at the front end of the partition 121 and extends along the Z-axis. A hinge 141 is disposed on the front side of the second column 140, and the door 150 is hingedly connected to the second column 140 via the hinge 141. The second column 140 is also provided with a second sealing member (not shown). There are multiple second columns 140, and the multiple second columns 140 are spaced apart and disposed on the box body 110 along the X-axis.

[0049] Correspondingly, a plurality of first columns 130 are disposed at the front end of the box body 110 . The plurality of first columns 130 are sequentially spaced apart along the X-axis direction, and the plurality of first columns 130 are inserted between the plurality of second columns 140 . When the door body 150 is in the closed position, the door body 150 is located between two adjacent second columns 140, the front side of the door body 150 is flush with the front side of the second column 140, and a second air port is formed between the door body 150 and the second column 140. The second seal is sealed at the second air port to prevent the gas in the electrical compartment 111a1 and the temperature control compartment 111a2 from passing through the gap between the door body 150 and the second column 140 and flowing into each other; the first column 130 is located behind the door body 150, and the first seal 133 is located between the door body 150 and the second column 140 to seal the first air port between the door body 150 and the second column 140, thereby blocking the gas in the electrical compartment 111a1 and the temperature control compartment 111a2 from passing through the gap between the door body 150 and the first column 130 and flowing into each other.

[0050] See also Figure 4 and Figure 5In this embodiment, the first column 130 includes a first extension section, a second extension section and a third extension section. The first extension section extends downward from the upper end of the electrical compartment 111a1 to the lower end of the electrical compartment 111a1, the second extension section extends from the upper end of the temperature control compartment 111a2 to the lower end of the temperature control compartment 111a2, and the third extension section is located at a corresponding position on the front side between the electrical compartment 111a1 and the temperature control compartment 111a2. The lower end of the first extension section and the upper end of the second extension section are connected through the third extension section. When the door body 150 is closed, the first air outlet is formed between the third extension section and the door body 150.

[0051] The first column 130 has a first cutting edge 131 and a second cutting edge 132 formed at both ends along the X-axis direction. The first cutting edge 131 and the second cutting edge 132 are located on the side of the first column 130 facing away from the accommodating cavity 111, specifically on the front side of the first column 130. A card slot 130a is formed between the first cutting edge 131 and the second cutting edge 132.

[0052] In this embodiment, the first sealing member 133 can have a variety of shapes and fixing methods, as long as it can block the first air flow port. In the prior art, the gas in the temperature control chamber 111a2 would sequentially pass through the first and second cutting edges 131, 132 of the second extension section, the third extension section, the first and second cutting edges 131, 132 of the first extension section, and then enter the electrical chamber 111a1 (the gas flow path from the electrical chamber 111a1 to the temperature control chamber 111a2 is the opposite). In this embodiment, by having the first sealing member 133 block the gap between the third extension section and the door body 150, the gas in the electrical chamber 111a1 and the temperature control chamber 111a2 is prevented from flowing between each other.

[0053] In one embodiment, the first sealing member 133 is a sealing strip that is sleeved over the first cutting edge 131 and the second cutting edge 132. To facilitate securing the sealing strip to the first pillar 130, the sealing strip extends from the upper end of the first pillar 130 to the lower end of the first pillar 130. The cross-section of the sealing strip can be V-shaped, U-shaped, Y-shaped, etc., and those skilled in the art can select a shape based on their needs, and this embodiment is not limited thereto.

[0054] In another embodiment, the first sealing member 133 is a sealing strip that is secured within the slot 130a. To enhance the stability of the engagement between the sealing strip and the first pillar 130, the sealing strip extends from the upper end of the first pillar 130 to the lower end of the first pillar 130. The cross-section of the sealing strip can be rectangular, triangular, circular, hexagonal, or the like, and those skilled in the art may select a suitable shape based on their needs. This embodiment is not intended to limit this.

[0055] See also Figure 5In this embodiment, an elastic edge 1331 is provided on the sealing strip (first sealing member 133). When the door body 150 is in the open position, the angle between the elastic edge 1331 and the YZ plane is β1. When the door body 150 is in the closed position, the angle between the elastic edge 1331 and the YZ plane is β2, and β2>β1.

[0056] See also Figure 6 In this embodiment, when the door 150 is in the closed position, the front side of the sealing strip (first sealing member 133) forms an abutment surface that abuts the first pillar 130. An included angle α is formed between the elastic edge 1331 and the abutment surface, where α is greater than 90°. The elastic edge 1331 elastically abuts the door 150; preferably, 120° ≤ α ≤ 180°. The provision of the elastic edge 1331 further enhances the sealing of the first air port.

[0057] See also Figure 2 and Figure 3 In this embodiment, a partition 122 is further provided in the accommodating chamber 111, and the partition 122 divides the accommodating chamber 111 into an electrical compartment 111a1 and a temperature control compartment 111a2 along the Z-axis direction. In the closed position, a second air port is formed between the door body 150 and the partition 122, and a second sealing member is provided at one end of the partition 122 facing the door body 150, and the second sealing member is used to seal the second air port.

[0058] In this embodiment, there are multiple partitions 122, which are arranged sequentially along the X-axis. The multiple partitions 122 collectively divide the accommodating chamber 111 into an electrical compartment 111a1 and a temperature control compartment 111a2, which are arranged vertically. The partitions 122 are arranged one-to-one with the hatches 1111a. The partitions 122 are located in the compartment 1111 near the lower end of the compartment 1111. The partitions 122 divide the compartment 1111 into a first compartment 11111 and a second compartment 11112, which are arranged vertically. The third extension of the first column 130 is located between two adjacent partitions 122. A third sealing member 1222 is provided at the front end of the partition 122. In the closed position, a third air flow port is formed between the door body 150 and the partition 122. The third sealing member 1222 is used to seal the third air flow port. By providing a third sealing member 1222 at the front end of the partition 122 , it is possible to prevent the gases in the electrical compartment 111 a 1 and the temperature control compartment 111 a 2 from flowing through the gap between the door body 150 and the partition 122 .

[0059] In this embodiment, the third sealing member 1222 may have various shapes and fixing methods, as long as it can seal the third gas string port.

[0060] Please continue reading Figure 3In one specific embodiment, the upper and lower ends of the front side of the partition 122 are provided with extensions 1221, and the third sealing member 1222 is sleeved on the extensions 1221. The extensions 1221 at the upper and lower ends of the front side of the partition 122 are respectively the first extension 1221 and the second extension 1221, and a fixing groove is formed between the first extension 1221 and the second extension 1221. The third sealing member 1222 is a sealing strip, which extends from the leftmost side of the front end of the partition 122 to the rightmost side of the front end of the partition 122. The sealing strip (third sealing member 1222) can be sleeved on the first extension 1221 and the second extension 1221, or be clamped in the fixing groove. The shape of the sealing strip can refer to the setting method of the first sealing member 133 mentioned above, and this embodiment will not be described in detail.

[0061] In this embodiment, another opening is provided on the rear side of the box body 110 and a door body is provided to open or close the opening. The rear end of the box body 110 is also provided with a first column, a second column, a first seal and a second seal. Among them, the positions and connections of the opening at the rear end of the box body 110, the door body, the first column, the second column, the first seal and the second seal, etc., please refer symmetrically to the relationships between the opening at the front end of the box body 110, the door body 150, the first column 130, the second column 140, the first seal 133 and the second seal, etc., and this embodiment will not repeat them one by one.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An energy storage device, characterized in that: include: The box body is provided with a containing cavity with an opening on one side, the containing cavity is divided into an electrical compartment and a temperature control compartment along the vertical direction, and the opening is divided into a plurality of hatches arranged in sequence along the horizontal direction; A first column, arranged between two adjacent hatches; A door body is hinged on the box body, and the door body is used to open or close the hatches, so as to control the opening and closing of the electrical compartment and the temperature control compartment, wherein one door body corresponds to covering n hatches, n≥1, and the door body has a closed position for covering the hatches; A cutting surface is formed on the side of the first column facing away from the accommodating cavity, and a first sealing member is arranged on the first column. In the closed position, a first air connection port connecting the electrical compartment and the temperature control compartment is formed between the door body and the cutting surface, and the first sealing member is used to seal the first air connection port.

2. The energy storage device according to claim 1, characterized in that The first sealing member extends from the upper end of the first column to the lower end of the first column.

3. The energy storage device according to claim 2, characterized in that: The first sealing member is a sealing strip, and a first cutting edge and a second cutting edge are formed at both ends of the first column in the width direction. The first cutting edge and the second cutting edge are located on the side of the first column facing away from the accommodating cavity, and the sealing strip is sleeved on the first cutting edge and the second cutting edge.

4. The energy storage device according to claim 3, characterized in that: The sealing strip is provided with an elastic edge. When the door body is in the closed position, the sealing strip forms an abutting surface abutting against the first column. The elastic edge is located on both sides of the abutting surface. An angle is formed between the elastic edge and the sealing strip. The elastic edge elastically abuts against the door body.

5. The energy storage device according to claim 4, characterized in that: The included angle between the elastic edge and the abutting surface is α, 120°≤α≤180°.

6. The energy storage device according to claim 1, characterized in that: A first cutting edge and a second cutting edge are formed at both ends of the first column in the width direction, a clamping groove is formed between the first cutting edge and the second cutting edge, and the first sealing member is clamped in the clamping groove.

7. The energy storage device according to claim 1, characterized in that: A partition is provided in the accommodating chamber, and the partition divides the accommodating chamber into the electrical compartment and the temperature control compartment in the vertical direction. A third sealing member is provided on the partition. In the closed position, a third air connection port is formed between the door body and the partition, and the third sealing member is used to seal the third air connection port.

8. The energy storage device according to claim 7, characterized in that: The upper and lower ends of the partition plate close to the door body are provided with extensions, and the third sealing member is sleeved on the extensions.

9. The energy storage device according to claim 1, characterized in that: The accommodating cavity is also provided with a plurality of partitions arranged at intervals in the horizontal direction, and the plurality of partitions divide the accommodating cavity into a plurality of cabins, and the cabins are arranged in a one-to-one correspondence with the hatches.

10. The energy storage device according to claim 1, characterized in that: There are multiple door bodies, which are arranged adjacent to each other in a horizontal direction, and are used together to cover the opening.

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