Energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device and electric equipment. The energy storage device comprises a box body, at least one exhaust assembly and at least one plugging piece. The box wall of the box body is provided with at least one exhaust hole. The at least one exhaust assembly is detachably installed on the box body and located at the opening of the at least one exhaust hole. The exhaust assembly comprises an air guide structure, a negative pressure fan and an opening and closing assembly, the air guide structure is installed on the outer surface of the box body in a protruding mode and is provided with an air guide channel, one end of the air guide channel is provided with an air inlet communicated with the exhaust hole, the other end of the air guide channel is provided with an air outlet communicated with the outer space of the box body, and the air outlet faces the plane where the bottom wall of the box body is located; the negative pressure fan is arranged in the air guide channel; the opening and closing assembly is connected to the air guide structure or the box body and has an opening state for opening the exhaust hole and a closing state for closing the exhaust hole. When the exhaust assembly is detached from the box body, the at least one plugging piece is configured to seal the at least one exhaust hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an energy storage device and an electric equipment. BACKGROUND

[0002] The temperature difference between different regions in the battery prefabricated cabin or the energy storage cabinet in the prior art is large, which leads to poor temperature consistency of the single battery, and further reduces the service life of the battery prefabricated cabin or the energy storage cabinet. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an energy storage device and an electric equipment to solve the problem of large temperature difference between different regions in the energy storage device.

[0004] The energy storage device provided by the present application comprises:

[0005] The box body comprises a top wall, a side wall and a bottom wall, the top wall and the bottom wall are oppositely arranged along the height direction of the box body, and the two ends of the side wall are connected with the top wall and the bottom wall respectively; the top wall and / or the area close to the top wall of the side wall has at least one exhaust hole;

[0006] At least one exhaust assembly is detachably mounted on the box body and located at the hole opening of at least one exhaust hole respectively; the exhaust assembly comprises a gas guide structure, a negative pressure fan and an opening and closing assembly, the gas guide structure is protrusively arranged on the outer surface of the box body and has a gas guide channel, one end of the gas guide channel has an air inlet communicated with the exhaust hole, the other end has an air outlet communicated with the external space of the box body, and the air outlet faces the plane where the bottom wall of the box body is located; the negative pressure fan is arranged in the gas guide channel; the opening and closing assembly is arranged at the position of the gas guide channel close to the exhaust hole, and has an opening state of opening the exhaust hole and a closing state of closing the exhaust hole;

[0007] At least one sealing piece is configured to seal at least one exhaust hole respectively when the exhaust assembly is detached from the box body.

[0008] The energy storage device provided by the embodiments of the present application can discharge the high-temperature gas in the box to the outside space of the box through the air guide channel of the air guide structure when the opening and closing assembly is in the open state, thereby reducing the temperature difference between the high-temperature area and the low-temperature area in the internal space of the box, improving the temperature consistency of the batteries in the box, and prolonging the service life of the energy storage device. In addition, the opening and closing assembly can also be in the closed state. In the closed state, the opening and closing assembly closes the exhaust hole, blocks the communication path between the internal space of the box and the outside space, ensures the heat preservation effect of the box, and avoids the problem of battery short circuit caused by rainwater flowing into the box through the exhaust hole due to the open state of the exhaust hole. In addition, when the batteries in the box are in thermal runaway, the exhaust assembly can also play an auxiliary exhaust role. In addition, the energy storage device is not provided with an exhaust assembly during transportation, but the exhaust hole is sealed by the plugging member, thereby avoiding the influence of the exhaust assembly protruding from the outer surface of the box on the stacking of the boxes of multiple energy storage devices, and ensuring the sealing performance of the box.

[0009] According to some embodiments of the present application, the opening and closing assembly comprises:

[0010] a movable part movably connected to the air guide structure or the box; and

[0011] a driving part, one end of the driving part being connected to the movable part and the other end being connected to the air guide structure or the box, for driving the movable part to move in response to an input signal;

[0012] wherein, when the opening and closing assembly is in the open state, the movable part opens the exhaust hole; and when the opening and closing assembly is in the closed state, the movable part closes the exhaust hole.

[0013] In the embodiments of the present application, the driving part can drive the movable part to move in response to an input signal, thereby actively opening or closing the exhaust hole, and further opening or closing the exhaust hole at regular time intervals, thereby achieving the effect of automatic temperature control.

[0014] According to some embodiments of the present application, the movable part comprises two movable plates, the movable plates being rotatably connected to the air guide structure or the box, and the rotation axes of the two movable plates being parallel to each other;

[0015] the driving part comprises two driving parts, the driving parts being connected to the air guide structure or the box, and the two driving parts being used for driving the two movable plates to rotate, respectively;

[0016] When the opening and closing assembly is in the open state, the two movable plates are separated from each other and a gap formed between the two movable plates is communicated with the exhaust hole; when the opening and closing assembly is in the closed state, the two movable plates are close to each other and are located on the same plane.

[0017] In the embodiments of the present application, the two movable plates form a double-door structure, the rotation angle of each movable plate is larger, compared with a single-door structure, the gap formed between the two movable plates is larger, the flow area of the gap is increased, and the exhaust speed of the gas is improved.

[0018] According to some embodiments of the present application, one end of the movable plate is provided with a connecting end, and the other end is provided with a sealing end, the connecting end is arranged opposite to the sealing end, and the connecting end is rotatably connected to the gas guide structure or the box body;

[0019] At least one of the sealing ends of the two movable plates is provided with a sealing strip, and the sealing ends of the two movable plates jointly press the sealing strip when the opening and closing assembly is in the closed state.

[0020] In the embodiments of the present application, the sealing strip is arranged on the sealing end of the movable plate, and the sealing ends of the two movable plates jointly press the sealing strip when the opening and closing assembly is in the closed state, on the one hand, direct contact between the sealing ends of the two movable plates can be avoided to generate noise, and on the other hand, the sealing strip can be tightly filled in the gap between the sealing ends of the two movable plates to improve the sealing performance of the two movable plates.

[0021] According to some embodiments of the present application, the position of the gap is opposite to the position of the negative pressure fan in the thickness direction of the wall of the box body.

[0022] In the embodiments of the present application, since the position of the gap is opposite to the position of the negative pressure fan, the suction force of the negative pressure fan is not affected by other obstacles, and the exhaust efficiency and the exhaust volume of the negative pressure fan are improved.

[0023] According to some embodiments of the present application, the gas guide structure comprises:

[0024] The gas guide cover is connected to the box body and covers the exhaust hole; the gas guide cover comprises a first gas guide cavity with a first opening and a second opening, the first opening is communicated with the exhaust hole, and the flow area of the first opening is larger than that of the second opening; the negative pressure fan is located in the first gas guide cavity, the air inlet side of the negative pressure fan faces the first opening, and the air outlet side of the negative pressure fan faces the second opening; and

[0025] An air guide pipe connected to the air guide cover, the air guide pipe comprising a second air guide cavity having a third opening and a fourth opening, the third opening being in communication with the second opening;

[0026] The air guide passage comprises the first air guide cavity and the second air guide cavity, the first opening is the air inlet, and the fourth opening is the air outlet.

[0027] In the embodiments of the present application, on the one hand, the flow area of the first opening of the air guide cover is larger than that of the second opening. When the gas flows from the first opening to the second opening, the flow rate of the gas is accelerated, thereby improving the exhaust efficiency. On the other hand, the larger opening of the air guide cover can make the gas flow more uniformly, and the smaller opening can help to concentrate the gas flow, thereby ensuring the directionality and stability of the gas flow during the exhaust process.

[0028] According to some embodiments of the present application, the shape of the air guide cover is a prism or a circular truncated cone, the first opening is arranged on the bottom surface of the prism or the circular truncated cone, and the second opening is arranged on the top surface of the prism or the circular truncated cone.

[0029] According to some embodiments of the present application, the inner surface and / or the outer surface of the air guide cover is provided with a heat preservation layer.

[0030] In the embodiments of the present application, the air guide cover is provided with a heat preservation layer, which has a heat preservation effect and reduces the heat loss in the box.

[0031] According to some embodiments of the present application, the air guide pipe comprises a first straight section, a second straight section and a bending section, one end of the first straight section is connected to the air guide cover, and one end of the first straight section has the third opening, one end of the bending section is connected to the other end of the first straight section, the other end of the bending section is connected to one end of the second straight section, and the other end of the second straight section has the fourth opening; the first straight section and the second straight section are arranged in parallel.

[0032] In the embodiments of the present application, the shape of the air guide pipe is approximately U-shaped, so that the openings of the third opening and the fourth opening of the air guide pipe are in the same direction, thereby preventing external rainwater from flowing back into the air guide pipe from the fourth opening.

[0033] According to some embodiments of the present application, a check valve is further arranged in the air guide passage, the check valve is configured to allow the gas to flow from the air inlet to the air outlet, and to prohibit the gas to flow from the air outlet to the air inlet.

[0034] In the embodiments of the present application, the check valve can prevent external gas from flowing back.

[0035] According to some embodiments of the present application, the outer surface of the box is covered with a heat insulation layer.

[0036] In the embodiments of the present application, the outer wall of the cabinet is covered with a thermal insulation layer, so that the absorption rate of the cabinet to the solar radiation heat is reduced, and the temperature rise of the cabinet due to the solar radiation is reduced.

[0037] According to some embodiments of the present application, the sealing member comprises:

[0038] A sealing plate is used to overlap the hole edge of the exhaust hole;

[0039] An insertion part is connected to the side surface of the sealing plate facing the exhaust hole, and is used to be inserted into the exhaust hole; the insertion part has a cavity, and the cavity is filled with thermal insulation material; and

[0040] A sealing ring is arranged around the outer periphery of the insertion part, and is clamped between the sealing plate and the outer surface of the cabinet.

[0041] In the embodiments of the present application, when the sealing member is installed on the cabinet, the insertion part can be inserted into the exhaust hole. The cavity of the insertion part is filled with thermal insulation material, which can play a thermal insulation effect, and avoid affecting the temperature inside the cabinet due to the exhaust hole of the cabinet.

[0042] According to some embodiments of the present application, the side wall has the exhaust hole, and the distance between the center of the exhaust hole and the top wall is H, 200mm≤H≤500mm.

[0043] According to some embodiments of the present application, the number of exhaust holes is at least two, the number of exhaust assemblies is at least two, and the inside of the cabinet has a plurality of areas arranged in a first direction in sequence, and the cabinet wall corresponding to each area has at least one exhaust hole.

[0044] The energy storage device further comprises a plurality of first temperature sensors and a controller, one first temperature sensor is arranged in each area, the first temperature sensor is used to monitor the temperature in the corresponding area, the controller is signal connected with the plurality of first temperature sensors and the opening and closing components of the plurality of exhaust assemblies, and is used to control the opening and closing components of the exhaust assembly corresponding to the area with higher temperature to be in an open state when the temperature difference between any two areas is greater than or equal to a first threshold value.

[0045] In the embodiments of the present application, the controller can control the state of the opening and closing components of the plurality of exhaust assemblies in real time according to the comparison result of the temperature difference between any two areas and the first threshold value, so as to ensure that the temperature difference between any two areas in the cabinet meets the requirements, and improve the service life of the energy storage device.

[0046] According to some embodiments of this application, the energy storage device further includes at least one first temperature sensor, at least one second temperature sensor, and a controller. The first temperature sensor is disposed inside the housing and is used to monitor the temperature inside the housing. The second temperature sensor is disposed outside the housing and is used to monitor the temperature outside the housing. The controller is signal-connected to the first temperature sensor, the second temperature sensor, and the opening / closing component of the exhaust assembly, and is used to control the opening / closing component of the exhaust assembly to be in the open state when the temperature inside the housing is greater than the temperature of the external environment and the temperature difference is greater than or equal to a second threshold.

[0047] In this embodiment of the application, the controller controls the state of the opening and closing component of the exhaust assembly based on the comparison result between the temperature inside the box and the temperature difference outside the box and the second threshold. When the temperature difference is greater than the second threshold, the controller controls the opening and closing component to be in the open state to exhaust, so as to avoid the temperature difference between the inside and outside of the box being too large.

[0048] The electrical equipment in this application embodiment includes the energy storage device described in any of the above claims, and the energy storage device supplies power to the electrical equipment. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0050] Figure 1 This is a schematic diagram of a residential energy storage system.

[0051] Figure 2 This is a three-dimensional schematic diagram of an energy storage device.

[0052] Figure 3 This is a partial schematic diagram of the exhaust assembly installed on the top wall.

[0053] Figure 4 yes Figure 3 A schematic diagram of its breakdown.

[0054] Figure 5 This is an exploded view of the exhaust assembly from one perspective.

[0055] Figure 6 This is an exploded view of the exhaust assembly from another perspective.

[0056] Figure 7 It is along Figure 3 A schematic diagram obtained after sectioning along the AA section line.

[0057] Figure 8 is a schematic view of the opening and closing assembly in an open state.

[0058] Figure 9 is a schematic view of the opening and closing assembly in a closed state.

[0059] Figure 10 is a schematic view of the controller being signal connected with the first temperature sensor and the driving part of the opening and closing assembly.

[0060] Figure 11 is a schematic view of the plugging member sealing the exhaust hole.

[0061] Figure 12 is a schematic view of the Figure 11 is an exploded schematic view of the

[0062] Figure 13 is a schematic view of the plugging member.

[0063] Figure 14 is a schematic view of the electrical equipment.

[0064] In the drawings, the reference signs are explained as follows:

[0065] 1, energy storage device; 2, electric energy conversion device; 3, user load; 4, electrical equipment;

[0066] 100, box body; 100a, area; 110, top wall; 111, exhaust hole; 120, side wall; 121, first side wall; 122, second side wall; 130, bottom wall; 140, heat insulation layer;

[0067] 200, exhaust assembly; 210, air guide structure; 211, air guide channel; 2111, air inlet; 2112, air outlet; 212, air guide cover; 2121, first air guide cavity; 2121a, first opening; 2121b, second opening; 213, air guide pipe; 2131, second air guide cavity; 2131a, third opening; 2131b, fourth opening; 2132, first straight section; 2133, bending section; 2134, second straight section 2134; 220, negative pressure fan; 230, opening and closing assembly; 231, movable part; 2311, movable plate; 2311a, connecting end; 2311b, sealing end; 2312, notch; 232, driving part; 2321, driving member; 233, sealing strip; 240, check valve; 250, heat preservation layer; 260, dustproof member;

[0068] 300, plugging member; 310, sealing plate; 320, insertion part; 330, sealing ring;

[0069] 410, first temperature sensor; 420, second temperature sensor;

[0070] 500、controller;

[0071] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0072] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided as non-limiting examples so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will not be repeated.

[0073] It is to be understood that the terms "including", "comprising", "having" and "with" used herein are meant to be interpreted inclusively and not exclusively. For example, a process, method, system, product or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements, but can include additional steps or elements not expressly listed or inherent to such process, method, system, product or apparatus.

[0074] Since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate of energy, it is necessary to store one form of energy into the same or another form of energy through a medium or device, and then release it in a specific energy form based on future application needs.

[0075] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0076] (1) Large energy storage containers applied in power grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, realize load matching of electric energy in time and space, enhance renewable energy consumption capacity, and are of great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0077] (2) Small and medium-sized energy storage cabinets applied in commercial energy storage scenarios (banks, shopping malls, etc.) at the user side and small household energy storage boxes applied in household energy storage scenarios at the user side, mainly running in the mode of "peak load shifting". Due to the large price difference between the electricity prices at the peak and valley positions according to the electricity demand, after the user has the energy storage device, in order to reduce the cost, the energy storage cabinet / box is usually charged during the low electricity price period; the electricity in the energy storage device is discharged for use during the high electricity price period, so as to achieve the purpose of saving electricity cost. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to that the user provides a standby power source for himself and the power grid, and avoids the inconvenience caused by frequent power outages due to disasters or other reasons.

[0078] Taking the household energy storage scenario in the user-side energy storage as an example, Figure 1 A household energy storage system is shown, which includes an energy storage device 1 and an electric energy conversion device 2 (such as a photovoltaic panel), and a user load 3 (such as a street lamp, a household appliance, etc.), the energy storage device 1 is a small energy storage box, which can be installed on an outdoor wall in a wall-mounted manner. Specifically, the electric energy conversion device 2 can convert solar energy into electric energy during the low electricity price period, and store the electric energy through the energy storage device 1, and then supply the user load 3 for use during the high electricity price period, or supply the user load 3 for use when the power grid is disconnected / power off.

[0079] And in the case of energy storage by physical or electrochemical means as described above, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one group of chemical batteries, which use chemical elements in the chemical batteries as energy storage media to realize the charging and discharging process through chemical reactions or changes of the energy storage media. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through chemical reactions or changes of the energy storage media, and when the use of external electric energy reaches a peak, the electric quantity stored in the at least one group of chemical batteries is released for use through chemical reactions or changes of the energy storage media, or is transferred to a place where electric quantity is in short supply for use.

[0080] The embodiment of the present application provides an energy storage device 1, which can be but is not limited to an energy storage cabinet, a prefabricated cabin or an energy storage container, etc. Next, taking the energy storage device as an energy storage cabinet as an example for description.

[0081] As shown in Figure 2 The energy storage device 1 includes a cabinet 100 and a battery pack (not shown in the figure), and the battery pack is contained in the cabinet 100.

[0082] In an embodiment, the box 100 is cuboid in shape, and includes a top wall 110, a bottom wall 130, and side walls 120. The top wall 110 and the bottom wall 130 are oppositely arranged along a third direction D3, and the side walls 120 are connected to the top wall 110 and the bottom wall 130 at two ends thereof, respectively. The side walls 120 are rectangular annular structures, and include two first side walls 121 and two second side walls 122. The two second side walls 122 are oppositely arranged along a first direction D1, and the two first side walls 121 are oppositely arranged along a second direction D2. The top wall 110 and the bottom wall 130 are connected to the two second side walls 122 at two ends thereof along the first direction D1, respectively, and the top wall 110 and the bottom wall 130 are connected to the two first side walls 121 at two ends thereof along the second direction D2, respectively. Each of the first side walls 121 is connected to the two second side walls 122 at two ends thereof along the first direction D1, respectively, and is connected to the top wall 110 and the bottom wall 130 at two ends thereof along the third direction D3, respectively. Each of the second side walls 122 is connected to the two first side walls 121 at two ends thereof along the second direction D2, respectively, and is connected to the top wall 110 and the bottom wall 130 at two ends thereof along the third direction D3, respectively.

[0083] The first direction D1 is a length direction of the cuboid, the second direction D2 is a width direction of the cuboid, and the third direction D3 is a height direction of the cuboid. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other in pairs.

[0084] As shown in FIG. 1, the energy storage device 1 further includes at least one exhaust assembly 200, which is arranged on the box 100 and used for exhausting gas in the box 100. Figure 3 Figure 4 As shown in FIG. 1, the energy storage device 1 further includes at least one exhaust assembly 200, which is arranged on the box 100 and used for exhausting gas in the box 100.

[0085] As shown in FIG. 1, the energy storage device 1 further includes at least one exhaust assembly 200, which is arranged on the box 100 and used for exhausting gas in the box 100. Figure 4 As shown in FIG. 1, the top wall 110 and / or the side wall 120 of the box 100 has at least one exhaust hole 111. The at least one exhaust assembly 200 is detachably connected to the box 100 and located at a hole opening of the at least one exhaust hole 111, respectively. The gas in the box 100 can be exhausted to an external space of the box 100 through the exhaust hole 111 and the exhaust assembly 200.

[0086] It can be understood that the number of the exhaust holes 111 can be one or more, and the number of the exhaust assemblies 200 can be one or more. In the embodiments of the present application, as shown in FIG. 1, the number of the exhaust holes 111 and the number of the exhaust assemblies 200 are both three, but are not limited thereto. Figure 2

[0087] ​​When there is only one vent hole 111, the vent hole 111 can be located on the top wall 110 or in the area of ​​the side wall 120 near the top wall 110. When there are multiple vent holes 111, all of the vent holes 111 can be located on the top wall 110, all of them can be located in the area of ​​the side wall 120 near the top wall 110, or some of the vent holes 111 can be located on the top wall 110 and the other part of the vent holes 111 can be located in the area of ​​the side wall 120 near the top wall 110.

[0088] like Figure 2 and Figure 4 As shown in this embodiment, the vent 111 is located on the top wall 110 of the housing 100. In other embodiments, the vent 111 may also be located on the first side wall 121 and / or the second side wall 122 of the housing 100. For example, when the vent 111 is located on the first side wall 121, its position is closer to the top wall 110 than the bottom wall 130. Similarly, when the vent 111 is located on the second side wall 122, its position is closer to the top wall 110 than the bottom wall 130.

[0089] like Figure 2 As shown, in one embodiment, when an exhaust hole 111 is provided in the area of ​​the side wall 120 near the top wall 110, the distance between the center of the exhaust hole 111 and the top wall 110 is H, where 200mm≤H≤500mm.

[0090] like Figure 5 and Figure 6 As shown, the exhaust assembly 200 includes an air guiding structure 210, a negative pressure fan 220, and an opening / closing assembly 230. The air guiding structure 210 is protrudingly mounted on the outer surface of the housing 100 and has an air guiding channel 211. One end of the air guiding channel 211 has an air inlet 2111 communicating with the exhaust port 111, and the other end has an air outlet 2112 communicating with the external space of the housing 100. The negative pressure fan 220 is installed inside the air guiding channel 211 and is used to discharge the gas inside the housing 100 to the outside of the housing 100 through the air guiding channel 211. The opening / closing assembly 230 is connected to the air guiding structure 210 or the housing 100 and is located in the air guiding channel 211 near the exhaust port 111. The opening / closing assembly 230 has an open state for opening the exhaust port 111 and a closed state for closing the exhaust port 111.

[0091] The energy storage device 1 provided in the embodiments of the present application can discharge the high-temperature gas in the box 100 to the outside space of the box 100 through the gas discharge channel 211 of the gas guide structure 210 by the negative pressure fan 220 when the opening and closing assembly 230 is in the open state, thereby reducing the temperature difference between the high-temperature region and the low-temperature region in the internal space of the box 100, improving the temperature consistency of the batteries in the box 100, and prolonging the service life of the energy storage device 1. In addition, the opening and closing assembly 230 can also be in the closed state. In the closed state, the opening and closing assembly 230 closes the exhaust hole 111, blocks the communication path between the internal space and the external space of the box 100, ensures the heat preservation effect of the box 100, and avoids the battery short circuit problem caused by the rainwater flowing into the box 100 through the exhaust hole 111 in the open state. In addition, the exhaust assembly 200 can also play an auxiliary exhaust role when the batteries in the box 100 are in thermal runaway.

[0092] As shown in Figure 5 and Figure 6 , the opening and closing assembly 230 includes a movable part 231 and a driving part 232. The movable part 231 is movably connected to the gas guide structure 210 or the box 100. One end of the driving part 232 is connected to the movable part 231, and the other end is connected to the gas guide structure 210 or the box 100, for driving the movable part 231 to move in response to an input signal; wherein the movable part 231 opens the exhaust hole 111 when the opening and closing assembly 230 is in the open state; and the movable part 231 closes the exhaust hole 111 when the opening and closing assembly 230 is in the closed state.

[0093] In the embodiments of the present application, the driving part 232 can drive the movable part 231 to move in response to an input signal, thereby actively opening or closing the exhaust hole 111, and then opening or closing the exhaust hole 111 at a regular time, thereby achieving the effect of automatic temperature control.

[0094] For example, the temperature of the region of the energy storage device 1 facing the sun is higher, and the temperature of the region away from the sun is lower, and the temperature is higher at noon or in the afternoon, and the temperature is lower at other times. Then, for example, the driving part 232 receives an opening signal at 12 o'clock every day to drive the movable part 231 to open the exhaust hole 111, and receives a closing signal at 14 o'clock to drive the movable part 231 to close the exhaust hole 111. In this way, when the temperature is highest from 12 o'clock to 14 o'clock in a day, the exhaust hole 111 is in the open state, not only reducing the temperature difference between the region facing the sun and the region away from the sun of the box 100, but also achieving the effect of automatic temperature control.

[0095] In an embodiment, the movable part 231 can be connected to the air guide structure 210 or the box body 100. The driving part 232 can be connected to the air guide structure 210 or the box body 100. For the convenience of description, the following description takes the case that the movable part 231 and the driving part 232 are both connected to the air guide structure 210 as an example.

[0096] The moving mode of the movable part 231 can be rotation or sliding. For example, when the movable part 231 is rotatably connected to the air guide structure 210, the rotation axis of the movable part 231 can be parallel to the plane where the top wall 110 is located. When the movable part 231 is slidably connected to the air guide structure 210, the movable part 231 can slide in the plane where the top wall 110 is located.

[0097] As shown in Figure 5 to Figure 7 the movable part 231 includes two movable plates 2311, the movable plates 2311 are rotatably connected to the air guide structure 210 or the box body 100, and the rotation axes of the two movable plates 2311 are parallel to each other. In an embodiment, the rotation axes of the movable plates 2311 are parallel to the first direction D1, but the application is not limited thereto.

[0098] The driving part 232 includes two driving members 2321, the driving members 2321 are connected to the air guide structure 210 or the box body 100, and the two driving members 2321 are used to drive the two movable plates 2311 to rotate respectively; when the opening and closing assembly 230 is in the open state, the two movable plates 2311 are separated from each other and the gap 2312 formed therebetween is in communication with the exhaust hole 111; when the opening and closing assembly 230 is in the closed state, the two movable plates 2311 are close to each other and are located in the same plane.

[0099] In the embodiment of the application, the two movable plates 2311 constitute a double-leaf door structure, the rotation angle of each movable plate 2311 is larger, and compared with a single-leaf door structure, the gap 2312 formed after the two movable plates 2311 are separated from each other is larger, the flow area of the gap 2312 is increased, and thus the exhaust speed of the gas is improved.

[0100] In an embodiment, the driving member 2321 can be a motor, an electric push rod, etc. For example, when the driving member 2321 is a motor, the motor can be fixedly installed on the air guide structure 210 or the box body 100, the output shaft of the motor is connected with the movable plate 2311, and when the motor works, the movable plate 2311 can be driven to rotate. When the driving member 2321 is an electric push rod, one end of the electric push rod can be hingedly connected with the air guide structure 210, and the other end can be hingedly connected with the movable plate 2311. When the electric push rod is elongated or shortened, the movable plate 2311 can be driven to rotate.

[0101] As shown in Figure 8As shown in the figure, in an embodiment, when the opening and closing assembly 230 is in the open state, the position of the gap 2312 formed between the two movable plates 2311 is directly opposite the position of the negative pressure fan 220 in the thickness direction of the cabinet wall of the cabinet 100. In the embodiment of the present application, the position of the gap 2312 is directly opposite the position of the negative pressure fan 220 in the third direction D3. When the exhaust assembly 200 is installed on the first side wall 121 of the cabinet 100, the position of the gap 2312 is directly opposite the position of the negative pressure fan 220 in the second direction D2. When the exhaust assembly 200 is installed on the second side wall 122 of the cabinet 100, the position of the gap 2312 is directly opposite the position of the negative pressure fan 220 in the first direction D1.

[0102] In the embodiment of the present application, since the position of the gap 2312 is directly opposite the position of the negative pressure fan 220, the suction force of the negative pressure fan 220 is not affected by other obstacles, improving the exhaust efficiency and exhaust volume of the negative pressure fan 220.

[0103] As shown in the figure, Figure 6 and Figure 9 One end of the movable plate 2311 has a connecting end 2311a and the other end has a sealing end 2311b, and the connecting end 2311a is arranged opposite the sealing end 2311b. The connecting end 2311a is rotatably connected to the air guide structure 210 or the cabinet 100; at least one of the sealing ends 2311b of the two movable plates 2311 is provided with a sealing strip 233, and when the opening and closing assembly 230 is in the closed state, the sealing ends 2311b of the two movable plates 2311 jointly press the sealing strip 233.

[0104] In the embodiment of the present application, by arranging the sealing strip 233 on the sealing end 2311b of the movable plate 2311, and when the opening and closing assembly 230 is in the closed state, the sealing ends 2311b of the two movable plates 2311 jointly press the sealing strip 233, on the one hand, direct contact between the sealing ends 2311b of the two movable plates 2311 can be avoided to generate noise; on the other hand, the sealing strip 233 can be tightly filled in the gap between the sealing ends 2311b of the two movable plates 2311, improving the sealing performance of the two movable plates 2311 in sealing the exhaust hole 111.

[0105] Please refer back to Figure 5 to Figure 7The air guiding structure 210 includes an air guiding hood 212 and an air guiding pipe 213. The air guiding hood 212 is connected to the outer wall of the housing 100 and covers the exhaust port 111. The air guiding hood 212 includes a first air guiding chamber 2121 having a first opening 2121a and a second opening 2121b. The first opening 2121a communicates with the exhaust port 111, and the flow area of ​​the first opening 2121a is larger than the flow area of ​​the second opening 2121b. A negative pressure fan 220 is located inside the first air guiding chamber 2121, with the air inlet side of the negative pressure fan 220 facing the first opening 2121a and the air outlet side of the negative pressure fan 220 facing the second opening 2121b. The air duct 213 is connected to the air duct cover 212; the air duct 213 includes a second air duct chamber 2131 with a third opening 2131a and a fourth opening 2131b, the third opening 2131a being connected to the second opening 2121b; wherein, the air duct channel 211 includes a first air duct chamber 2121 and a second air duct chamber 2131, the first opening 2121a being an air inlet 2111, and the fourth opening 2131b being an air outlet 2112.

[0106] In the embodiments of this application, on the one hand, the flow area of ​​the first opening 2121a of the air guide shroud 212 is larger than the flow area of ​​the second opening 2121b. When the gas flows from the first opening 2121a to the second opening 2121b, the gas flow rate will increase, thereby improving the exhaust efficiency. On the other hand, the larger opening of the air guide shroud 212 allows the airflow to enter more evenly, while the smaller opening helps to concentrate the airflow, ensuring the directionality and stability of the airflow during the exhaust process.

[0107] In one embodiment, the air guide shroud 212 is shaped like a frustum or a truncated cone, with a first opening 2121a on the bottom surface of the frustum or truncated cone and a second opening 2121b on the top surface of the frustum or truncated cone.

[0108] It is understood that when the air guide shroud 212 is in the shape of a frustum, it can be a triangular frustum, a quadrangular frustum, a pentagonal frustum, etc., and this application does not make any special limitation on it.

[0109] like Figure 6 As shown, the air duct 213 includes a first straight section 2132, a second straight section 2134, and a bent section 2133. One end of the first straight section 2132 is connected to the air duct cover 212, and one end of the first straight section 2132 has a third opening 2131a. One end of the bent section 2133 is connected to the other end of the first straight section 2132, and the other end of the bent section 2133 is connected to one end of the second straight section 2134, and the other end of the second straight section 2134 has a fourth opening 2131b. The first straight section 2132 and the second straight section 2134 are arranged in parallel.

[0110] In the embodiments of the present application, the shape of the air guide pipe 213 is substantially U-shaped, so that the third opening 2131a and the fourth opening 2131b of the air guide pipe 213 are in the same direction. In this way, external rainwater can be prevented from flowing into the air guide pipe 213 from the fourth opening 2131b.

[0111] As shown in Figure 5 and Figure 6 The air exhaust assembly 200 further comprises a dustproof member 260 connected to the air guide pipe 213 and covering the fourth opening 2131b (i.e., the air outlet 2112) of the air guide pipe 213. By arranging the dustproof member 260, external dust or debris can be prevented from entering the air guide pipe 213 through the air outlet 2112.

[0112] As an example, the dustproof member 260 can be a dustproof screen or a louver.

[0113] As shown in Figure 7 The air guide channel 211 further comprises a check valve 240 configured to allow gas to flow from the air inlet 2111 to the air outlet 2112, but prevent gas from flowing from the air outlet 2112 to the air inlet 2111. In the embodiments of the present application, the check valve 240 can prevent external gas from flowing back.

[0114] In an embodiment, the check valve 240 can be arranged in the air guide pipe 213.

[0115] As shown in Figure 7 The inner surface and / or the outer surface of the air guide cover 212 is provided with a thermal insulation layer 250. Since the cabinet wall of the cabinet 100 is provided with the air exhaust hole 111, the heat in the cabinet 100 is easily exhausted through the air exhaust hole 111. In the embodiments of the present application, the air guide cover 212 is provided with the thermal insulation layer 250, which has a thermal insulation effect and reduces the heat loss in the cabinet 100.

[0116] In an embodiment, the thermal insulation layer 250 can be made of any of the following materials: rock wool, glass wool, polyurethane, etc.

[0117] In an embodiment, the air outlet 2112 is directed to the plane where the bottom wall 130 of the cabinet 100 is located. By designing the air outlet 2112 to be directed to the plane where the bottom wall 130 of the cabinet 100 is located, external rainwater can be prevented from entering the air exhaust assembly 200 through the air outlet 2112.

[0118] As an example, the shape of the air guide pipe 213 can be a U-shaped pipe, a J-shaped pipe, etc.

[0119] In an embodiment, the outer surface of the box 100 is covered with a thermal insulation layer 140. In the embodiments of the present application, by covering the outer surface of the box 100 with the thermal insulation layer 140, the absorption rate of the box 100 to the solar radiation heat can be reduced, and thus the temperature rise of the box 100 due to the solar radiation can be reduced.

[0120] As shown in FIG. 1, the box 100 is provided with a plurality of exhaust holes 111, and the box 100 is provided with a plurality of exhaust assemblies 200. Each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100, and each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100. Figure 2 Figure 10 As shown in FIG. 1, the box 100 is provided with a plurality of exhaust holes 111, and the box 100 is provided with a plurality of exhaust assemblies 200. Each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100, and each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100.

[0121] The energy storage device 1 further comprises a plurality of first temperature sensors 410 and a controller 500. Each of the regions 100a is provided with one of the first temperature sensors 410, and each of the first temperature sensors 410 is configured to monitor the temperature in the corresponding region 100a. The controller 500 is in signal connection with the plurality of first temperature sensors 410 and the driving parts 232 of the opening and closing assemblies 230 of the plurality of exhaust assemblies 200, and is configured to control the opening and closing assembly 230 of the exhaust assembly 200 corresponding to the region 100a with a higher temperature to be in an open state when the temperature difference between any two regions 100a is greater than or equal to a first threshold value.

[0122] As shown in FIG. 1, the box 100 is provided with a plurality of exhaust holes 111, and the box 100 is provided with a plurality of exhaust assemblies 200. Each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100, and each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100. Figure 10 As shown in FIG. 1, the box 100 is provided with a plurality of exhaust holes 111, and the box 100 is provided with a plurality of exhaust assemblies 200. Each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100, and each of the exhaust assemblies 200 is arranged in a corresponding region 100a of the box 100.

[0123] For example, when the temperature of T1 is greater than the temperature of T2, and the temperature difference between T1 and T2 is greater than the first threshold value, the controller 500 controls the opening and closing assembly 230 of P1 corresponding to Z1 to be in an open state, so that the gas in Z1 can be discharged to the outside space of the box 100 through P1, thereby reducing the temperature difference between different regions 100a in the box 100, and further improving the temperature consistency of the batteries in the box 100.

[0124] ​Therefore, in the embodiments of the present application, the controller 500 controls the state of the opening and closing assembly 230 of the plurality of exhaust assemblies 200 in real time according to the comparison result of the temperature difference between any two regions 100a and the first threshold value, thereby ensuring that the temperature difference between any two regions 100a in the cabinet 100 meets the requirements, and improving the service life of the energy storage device 1.

[0125] In an embodiment, the plurality of regions 100a can be arranged in sequence along the first direction D1. In other embodiments, the plurality of regions 100a can also be arranged in sequence along the third direction D3.

[0126] As shown in FIG. 1, Figure 10 The energy storage device 1 further comprises at least one first temperature sensor 410, at least one second temperature sensor 420, and a controller 500. The first temperature sensor 410 is arranged in the cabinet 100 to monitor the temperature in the cabinet 100, the second temperature sensor 420 is arranged outside the cabinet 100 to monitor the temperature outside the cabinet 100, and the controller 500 is in signal connection with the first temperature sensor 410, the second temperature sensor 420, and the opening and closing assembly 230 of the exhaust assembly 200. When the temperature in the cabinet 100 is greater than the temperature of the external environment, and the temperature difference is greater than or equal to the second threshold value, the controller 500 controls the opening and closing assembly 230 of the exhaust assembly 200 to be in an open state.

[0127] In the embodiments of the present application, the controller 500 controls the state of the opening and closing assembly 230 of the exhaust assembly 200 according to the comparison result of the temperature difference between the temperature in the cabinet 100 and the temperature outside the cabinet 100 and the second threshold value. When the temperature difference is greater than the second threshold value, the controller 500 controls the opening and closing assembly 230 to be in an open state for exhaust to avoid excessive temperature difference between the inside and outside of the cabinet 100.

[0128] When the number of exhaust assemblies 200 is multiple, the temperature in the cabinet 100 is greater than the temperature of the external environment, and the temperature difference is greater than or equal to the second threshold value, the controller 500 controls all the opening and closing assemblies 230 of the exhaust assemblies 200 to be in an open state.

[0129] As shown in FIG. 1, Figure 11 and Figure 12 The exhaust assembly 200 is detachably mounted on the cabinet 100; the energy storage device 1 further comprises at least one sealing member 300; when the exhaust assembly 200 is detached from the cabinet 100, the at least one sealing member 300 is configured to seal the at least one exhaust hole 111, respectively.

[0130] In the embodiments of the present application, the energy storage device 1 is not provided with the exhaust assembly 200 during transportation, but the exhaust hole 111 is sealed by the blocking member 300, so that the exhaust assembly 200 does not protrude from the outer surface of the box 100, and the stacking of the boxes 100 of the energy storage devices 1 is not affected, and the sealing of the box 100 is ensured.

[0131] When the energy storage device 1 is transported to the destination, the blocking member 300 is removed from the box 100, and the exhaust assembly 200 is assembled on the box 100. The removed blocking member 300 can be temporarily stored in a corner of the box 100 for use next time when the energy storage device 1 is transported.

[0132] As shown in Figure 13 The blocking member 300 includes a sealing plate 310, an insertion part 320 and a sealing ring 330. The sealing plate 310 is used to lap the hole edge of the exhaust hole 111; the insertion part 320 is connected to the side surface of the sealing plate 310 facing the exhaust hole 111, and is used to be inserted into the exhaust hole 111; the insertion part 320 has a cavity filled with thermal insulation material; and the sealing ring 330 is wrapped around the outer periphery of the insertion part 320 and is clamped between the sealing plate 310 and the outer surface of the box 100.

[0133] In the embodiments of the present application, when the blocking member 300 is installed on the box 100, the insertion part 320 can be inserted into the exhaust hole 111. The cavity of the insertion part 320 is filled with thermal insulation material, which can play a thermal insulation effect, and avoid affecting the temperature inside the box 100 due to the exhaust hole 111 provided in the box 100.

[0134] In an embodiment, the thermal insulation material includes but is not limited to rock wool, glass wool, polyurethane, etc.

[0135] As shown in Figure 14 The present application also provides an electrical equipment 4, which includes the energy storage device 1 of any one of the above embodiments.

[0136] It can be understood that the various embodiments / embodiments provided by the present application can be combined with each other without contradiction, and will not be illustrated one by one here.

[0137] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0138] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the embodiments of the application and simplify the description, and are not intended to indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the application.

[0139] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment", and the like, mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0140] The above is only the preferred embodiment of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. An energy storage device, characterized by, The application relates to a box body and an exhaust assembly. The box body comprises a top wall, a side wall and a bottom wall, the top wall and the bottom wall are oppositely arranged along the height direction of the box body, and the two ends of the side wall are connected with the top wall and the bottom wall respectively; the top wall and / or the side wall near the top wall have at least one exhaust hole penetrating through; At least one exhaust assembly is detachably mounted on the box body and located at the hole of at least one exhaust hole respectively; the exhaust assembly comprises a guide structure, a negative pressure fan and an opening and closing assembly, the guide structure is protrusively arranged on the outer surface of the box body and has a guide channel, one end of the guide channel has an air inlet communicated with the exhaust hole, and the other end has an air outlet communicated with the external space of the box body, and the air outlet faces the plane where the bottom wall is located; the negative pressure fan is arranged in the guide channel; the opening and closing assembly is arranged at the position of the guide channel near the exhaust hole and has an opening state of opening the exhaust hole and a closing state of closing the exhaust hole; At least one sealing piece is configured to seal at least one exhaust hole when the exhaust assembly is detached from the box body.

2. The energy storage device of claim 1, wherein, The opening and closing assembly comprises: a movable part movably connected with the guide structure or the box body; and a driving part, one end of the driving part is connected with the movable part, and the other end is connected with the guide structure or the box body, and the driving part is used for driving the movable part to move in response to an input signal; When the opening and closing assembly is in the opening state, the movable part opens the exhaust hole; when the opening and closing assembly is in the closing state, the movable part closes the exhaust hole.

3. The energy storage device of claim 2, wherein, The movable part comprises two movable plates, the movable plates are rotatably connected with the guide structure or the box body, and the rotation axes of the two movable plates are parallel to each other; The driving part comprises two driving pieces, the driving pieces are connected with the guide structure or the box body, and the two driving pieces are used for driving the two movable plates to rotate respectively; When the opening and closing assembly is in the opening state, the two movable plates are separated from each other, and a gap formed between the two movable plates is communicated with the exhaust hole; when the opening and closing assembly is in the closing state, the two movable plates are close to each other and located on the same plane.

4. The energy storage device of claim 3, wherein, One end of the movable plate has a connecting end, and the other end has a sealing end, the connecting end and the sealing end are oppositely arranged, and the connecting end is rotatably connected with the guide structure or the box body; At least one of the sealing ends of the two movable plates is provided with a sealing strip, and the sealing ends of the two movable plates jointly extrude the sealing strip when the opening and closing assembly is in the closing state.

5. The energy storage device of claim 3, wherein, The position of the gap and the position of the negative pressure fan are opposite in the thickness direction of the box wall of the box body.

6. The energy storage device of claim 1, wherein, The guide structure comprises: A gas guide cover is connected to the box body and covers the exhaust hole; the gas guide cover comprises a first gas guide cavity with a first opening and a second opening, the first opening is in communication with the exhaust hole, and the flow area of the first opening is larger than that of the second opening; the negative pressure fan is located in the first gas guide cavity, the air inlet side of the negative pressure fan faces the first opening, and the air outlet side of the negative pressure fan faces the second opening; and A gas guide pipe is connected to the gas guide cover; the gas guide pipe comprises a second gas guide cavity with a third opening and a fourth opening, and the third opening is in communication with the second opening; The gas guide channel comprises the first gas guide cavity and the second gas guide cavity, the first opening is the air inlet, and the fourth opening is the air outlet.

7. The energy storage device of claim 6, wherein, The shape of the gas guide cover is a prism or a circular truncated cone, the first opening is arranged on the bottom surface of the prism or the circular truncated cone, and the second opening is arranged on the top surface of the prism or the circular truncated cone.

8. The energy storage device of claim 6, wherein, The inner surface and / or the outer surface of the gas guide cover is provided with a heat preservation layer.

9. The energy storage device of claim 6, wherein, The gas guide pipe comprises a first straight section, a second straight section and a bending section, one end of the first straight section is connected to the gas guide cover, one end of the first straight section has the third opening, one end of the bending section is connected to the other end of the first straight section, the other end of the bending section is connected to one end of the second straight section, and the other end of the second straight section has the fourth opening; the first straight section and the second straight section are arranged in parallel.

10. The energy storage device of claim 1, wherein, A check valve is further arranged in the gas guide channel, and the check valve is configured to allow gas to flow from the air inlet to the air outlet and prohibit gas from flowing from the air outlet to the air inlet.

11. The energy storage device of claim 1, wherein, The outer surface of the box body is covered with a heat insulation layer.

12. The energy storage device of claim 1, wherein, The sealing member comprises: A sealing plate for overlapping the hole edge of the exhaust hole; An insertion part connected to the side surface of the sealing plate facing the exhaust hole for insertion into the exhaust hole; the insertion part has a cavity filled with heat preservation material; and A sealing ring surrounding the outer periphery of the insertion part and clamped between the sealing plate and the outer surface of the box body.

13. The energy storage device of claim 1, wherein, The side wall has the exhaust hole, and the distance between the center of the exhaust hole and the top wall is H, 200mm≤H≤500mm.

14. The energy storage device of claim 1, wherein, The number of exhaust holes is at least two, the number of exhaust assemblies is at least two, and the inside of the box body has a plurality of adjacent arranged areas, each area corresponding to the box wall of the box body has at least one exhaust hole; The energy storage device further comprises a plurality of first temperature sensors and a controller, one first temperature sensor is arranged in each area, the first temperature sensor is used for monitoring the temperature in the corresponding area, the controller is signal connected with the plurality of first temperature sensors and the opening and closing components of the plurality of exhaust assemblies, and when the temperature difference between any two areas is greater than or equal to a first threshold value, the opening and closing components of the exhaust assembly corresponding to the area with higher temperature are controlled to be in an open state.

15. The energy storage device of claim 1, wherein, The energy storage device further comprises at least one first temperature sensor, at least one second temperature sensor and a controller, the first temperature sensor is arranged in the box body for monitoring the temperature in the box body, the second temperature sensor is arranged outside the box body for monitoring the temperature outside the box body, the controller is in signal connection with the first temperature sensor, the second temperature sensor and the opening and closing component of the exhaust assembly, for controlling the opening and closing component of the exhaust assembly to be in the open state when the temperature in the box body is greater than the temperature of the external environment, and the temperature difference is greater than or equal to a second threshold value.

16. An electrical device, characterized by The energy storage device comprises the energy storage device of any one of claims 1-15, and the energy storage device supplies power for the electrical equipment.

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