Energy storage device with liquid cooling pipeline

Abstract

The utility model discloses an energy storage device with a liquid cooling pipeline. The energy storage device comprises a box body, a plurality of gate posts, a battery rack and a cluster-level liquid cooling pipeline, each door post extends in the height direction of the box body, the multiple door posts are arranged in a row in the length direction of the box body at intervals, and each door post in the multiple door posts is used for being hinged to one door plate; the battery rack is located in a containing space formed by the door post, the door plate and the box body, the battery rack comprises a plurality of stand columns extending in the height direction, and the stand columns are arranged in a row at intervals in the length direction of the box body; each door post in the row of door posts and one stand column in the row of stand columns are arranged at intervals in the depth direction of the box body; the cluster-level liquid cooling pipeline extends in the height direction and is arranged in a gap between the gate post and the stand column. According to the scheme, the gap between the row of door columns and the row of stand columns is used for containing the cluster-level liquid cooling pipeline, the space utilization rate of the energy storage device can be effectively utilized, and the energy density of the energy storage device is improved.

Description

[0001] This application claims priority to the Chinese patent application No. 202323661768.7, filed on December 29, 2023, entitled "Energy Storage Device with Liquid Cooling Pipeline", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage, in particular to an energy storage device with a liquid cooling pipeline. BACKGROUND

[0003] The energy storage device can store electrical energy, and can accept charging and release electrical energy. The energy storage device is prone to generate a large amount of heat energy in the working state (charging or discharging). In order to enable the energy storage device to work continuously and stably, a liquid cooling system is generally provided in the energy storage device to circulate and absorb the heat of each battery pack in the energy storage device, so as to reduce the temperature of the energy storage device.

[0004] At present, the liquid cooling system is arranged in the energy storage box, and the unreasonable layout of the liquid cooling system affects the energy density of the energy storage device. CONTENT OF THE INVENTION

[0005] The technical problem to be solved by the present application is to provide an energy storage device with a liquid cooling pipeline to improve the space utilization of the energy storage device.

[0006] In a first aspect, the present application provides an energy storage device with a liquid cooling pipeline, the energy storage device comprising a box body, a plurality of door columns, a battery rack and a cluster-level liquid cooling pipeline; each door column extends along the height direction of the box body, the plurality of door columns are arranged in a row in the length direction of the box body, and each door column in the plurality of door columns is used for being hingedly connected with a door plate; the battery rack is located in a containing space formed by the door column, the door plate and the box body, the battery rack comprises a plurality of vertical columns extending in the height direction, and the plurality of vertical columns are arranged in a row in the length direction of the box body; each door column in the row of door columns and a vertical column in the row of vertical columns are arranged in the depth direction of the box body; the cluster-level liquid cooling pipeline extends along the height direction, and the cluster-level liquid cooling pipeline is arranged in the gap between the door column and the vertical column. In the present application, the door column and the door plate are hingedly connected, and a certain space needs to be reserved between the door plate and the battery pack to prevent the door plate from colliding with or interfering with the battery pack when the door plate is opened or closed. The gap between the row of door columns and the row of vertical columns is used for accommodating the cluster-level liquid cooling pipeline, which can effectively utilize the space utilization of the energy storage device and improve the energy density of the energy storage device.

[0007] With reference to the first aspect, in a possible implementation manner, a size of the cluster-level liquid cooling pipeline in the length direction of the box is less than or equal to a size of the door column. In the length direction of the box, the battery pack is located between two adjacent columns. Since the size of the cluster-level liquid cooling pipeline in the length direction of the box is less than or equal to the size of the door column, the cluster-level liquid cooling pipeline does not occupy the space in front of the battery pack in the depth direction of the box, and does not interfere with the opening and closing of the door panel during maintenance or repair of the battery pack.

[0008] With reference to the first aspect, in a possible implementation manner, a size of the cluster-level liquid cooling pipeline in the length direction of the box is less than or equal to a size of the door column. In the length direction of the box, the battery pack is located between two adjacent columns. Since the size of the cluster-level liquid cooling pipeline in the length direction of the box is less than or equal to the size of the door column, the cluster-level liquid cooling pipeline does not occupy the space in front of the battery pack in the depth direction of the box, and does not interfere with the opening and closing of the door panel during maintenance or repair of the battery pack.

[0009] With reference to the first aspect, in a possible implementation manner, the cluster-level liquid cooling pipeline includes a cluster-level liquid supply pipeline and a cluster-level liquid return pipeline, the cluster-level liquid supply pipeline and the cluster-level liquid return pipeline both extend along the height direction of the box, the cluster-level liquid supply pipeline and the cluster-level liquid return pipeline are both located in the gap between the door column and the column, and the cluster-level liquid supply pipeline and the cluster-level liquid return pipeline are arranged along the depth direction of the box. The cluster-level liquid supply pipeline communicates with the battery pack and is used to supply the battery pack with cooling liquid, and the cluster-level liquid return pipeline communicates with the battery pack, and cooling liquid returns to the cluster-level liquid return pipeline from the battery pack during circulation of the battery pack. The cluster-level liquid supply pipeline and the cluster-level liquid return pipeline are both located in the gap between the door column and the column, which can effectively utilize the gap between the door column and the column, improve the energy density of the energy storage device, and also make the arrangement of the cluster-level liquid supply pipeline and the cluster-level liquid return pipeline more regular, so that the space of the energy storage device can be more reasonably utilized and the energy density of the energy storage device can be improved.

[0010] With reference to the first aspect, in a possible implementation manner, the energy storage device further includes a main-level liquid cooling pipeline extending along the length direction of the box, the main-level liquid cooling pipeline is arranged below the cluster-level liquid cooling pipeline, and the main-level liquid cooling pipeline communicates with the cluster-level liquid cooling pipeline. The cluster-level liquid cooling pipeline is located in the gap between the column and the door column, the main-level liquid cooling pipeline is below the cluster-level liquid cooling pipeline, and the main-level liquid cooling pipeline extends along the length direction of the box, so that the main-level liquid cooling pipeline does not occupy additional space of the energy storage device, and the energy density of the energy storage device can be improved.

[0011] With reference to the first aspect, in a possible implementation manner, the box body comprises a bottom plate for supporting the battery rack, and an upper surface of the bottom plate is recessed downward to form a pipe groove for accommodating the main-stage liquid cooling pipe. The upper surface of the bottom plate is recessed downward to form the pipe groove for accommodating the main-stage liquid cooling pipe, and the main-stage liquid cooling pipe is in the pipe groove, so that the space occupied by the main-stage liquid cooling pipe in the height direction of the energy storage device can be saved, and the energy density of the energy storage device is improved.

[0012] With reference to the first aspect, in a possible implementation manner, a size of the pipe groove in the height direction of the box body is greater than or equal to a size of the main-stage liquid cooling pipe. It can be obtained that the pipe groove can completely accommodate the main-stage liquid cooling pipe, the upper surface of the main-stage liquid cooling pipe is lower than the upper surface of the bottom plate, the main-stage liquid cooling pipe does not occupy the space in the front of the battery pack along the depth direction of the box body, and does not interfere with the maintenance of the battery pack.

[0013] With reference to the first aspect, in a possible implementation manner, the main-stage liquid cooling pipe comprises a main-stage liquid supply pipe and a main-stage liquid return pipe, the main-stage liquid supply pipe and the main-stage liquid return pipe both extend along the length direction of the box body, and the main-stage liquid supply pipe and the main-stage liquid return pipe are arranged along the depth direction of the box body and are both located in the pipe groove. The main-stage liquid supply pipe and the main-stage liquid return pipe are both located in the pipe groove, so that the space of the pipe groove can be effectively utilized, the energy density of the energy storage device is improved, and the arrangement of the main-stage liquid supply pipe and the main-stage liquid return pipe is more regular, so that the space of the energy storage device can be more reasonably utilized, and the energy density of the energy storage device is improved.

[0014] With reference to the first aspect, in a possible implementation manner, the bottom plate comprises a support area and a hollow area arranged along the depth direction of the box body, an upper surface of the support area is connected with the plurality of columns, and the pipe groove is located on a side of the support area away from the hollow area. Since the pipe groove is located on the side of the support area away from the hollow area, and the pipe groove is used for accommodating the main-stage liquid supply pipe, the main-stage liquid supply pipe is located below the cluster-stage liquid supply pipe, and the cluster-stage liquid supply pipe is located in the gap between the column and the door column in the depth direction of the box body, it can be obtained that the pipe groove is closer to the door column than the hollow area, the hollow area is below the battery pack, and the hollow area of the bottom plate can isolate the ground and the battery pack, so that the battery pack is not prone to moisture.

[0015] With reference to the first aspect, in a possible implementation manner, the hollow area has a hollow cavity, and the bottom plate is further provided with a floor drain pipe, the floor drain pipe being in communication with the pipe groove and the hollow cavity. When there is liquid accumulation in the pipe groove, the floor drain pipe can drain the liquid of the pipe to the hollow cavity, so as to prevent the pipe groove from being excessively filled with liquid and overflowing to the upper surface of the bottom plate to cause the bottom plate to be filled with liquid.

[0016] With reference to the first aspect, in a possible implementation manner, the cluster-level liquid cooling pipeline comprises a cluster-level liquid return pipeline extending along the height direction of the box body, the box body comprises a bottom plate for supporting the battery rack, one end of the cluster-level liquid return pipeline away from the bottom plate in the height direction is in communication with the exhaust valve, the bottom plate further comprises a liquid discharge port penetrating through the bottom plate, and the energy storage device further comprises a flow guide pipe, a first end of the flow guide pipe is connected with the exhaust port of the exhaust valve, and a second end of the flow guide pipe is in communication with the liquid discharge port. When the exhaust valve discharges the gas in the cluster-level liquid return pipeline, the gas is easy to carry part of the liquid in the cluster-level liquid return pipeline out, and by connecting the flow guide pipe with the exhaust port of the exhaust valve, the liquid carried by the gas can be discharged to the outside of the box body through the flow guide pipe, thereby preventing the liquid carried by the gas from bringing safety hazards to the energy storage device.

[0017] With reference to the first aspect, in a possible implementation manner, the energy storage device further comprises a clamp, the flow guide pipe is sleeved on the exhaust port, and the clamp surrounds the region of the flow guide pipe sleeved on the exhaust port. The clamp is used for clamping the flow guide pipe, and by the clamp, the first end of the flow guide pipe can be fixed on the exhaust port of the exhaust valve, thereby improving the connection stability of the flow guide pipe and the exhaust valve.

[0018] With reference to the first aspect, in a possible implementation manner, the energy storage device further comprises an adapter, the adapter has a first connection port opening towards the height direction of the box body and a second connection port opening towards the depth direction of the box body, the first connection port and the second connection port are in communication, the first connection port is in communication with the exhaust port of the exhaust valve, and the second connection port is in communication with the first end of the flow guide pipe. The exhaust port of the exhaust valve opens upwards, the second connection port opens towards the length direction of the box body, and the flow guide pipe needs to guide the liquid carried by the gas downwards the box body, and by connecting the first end of the flow guide pipe with the second connection port, the bending angle of the flow guide pipe can be reduced, thereby reducing the installation difficulty of the flow guide pipe.

[0019] With reference to the first aspect, in a possible implementation manner, the flow guide pipe comprises a first section and a second section in communication, the first section extends along a height direction of the cabinet, the second section extends along a depth direction of the cabinet, one end of the first section away from the second section is in communication with an exhaust port of the exhaust valve, and one end of the second section away from the first section is in communication with the liquid discharge port. In the depth direction of the cabinet, the bottom plate comprises two support areas extending along a length direction of the cabinet and used for supporting a plurality of the upright columns, and the liquid discharge port is arranged in one of the two support areas close to the door column. The flow guide pipe can guide the liquid entrained by the gas to the liquid discharge pipe through the first section and the second section in communication. The first section extends along the height direction of the cabinet, and the second section extends along the depth direction of the cabinet, so that the flow guide pipe is relatively regular as a whole. Since the cluster-level liquid cooling pipe is arranged in the gap between the door column and the upright column, that is, the cluster-level liquid return pipe is also arranged in the gap between the upright column and the door column, the liquid discharge port is arranged in the support area close to the door column of the two support areas. In addition, the first section is connected to the cluster-level liquid return pipe through the exhaust valve, and the support area close to the door column of the two support areas is also relatively close to the first section. Therefore, arranging the liquid discharge port in the support area close to the door column of the two support areas can reduce the size of the second section in the depth direction of the cabinet.

[0020] With reference to the first aspect, in a possible implementation manner, the first section is arranged in the gap between the door column and the upright column. The first section is accommodated in the gap between the door column and the upright column, so that the energy storage device does not need to additionally arrange space to accommodate the first section, thereby improving the space utilization rate of the energy storage device and further improving the energy density of the energy storage device.

[0021] With reference to the first aspect, in a possible implementation manner, the liquid discharge port is provided with a liquid discharge pipe, the hardness of the liquid discharge pipe is greater than that of the flow guide pipe, one end of the liquid discharge pipe is in communication with the second end of the flow guide pipe, and the other end of the liquid discharge pipe is in communication with the outside of the cabinet. The liquid discharge pipe can discharge the liquid entrained by the gas to the outside of the support area, thereby preventing the liquid entrained by the gas from forming a liquid pool in the support area. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the drawings needed to be used in the embodiments of the present application or the background art will be described below.

[0023] Figure 1 A front view of an energy storage device provided by the present application;

[0024] Figure 2 A three-dimensional structural schematic view of a cabinet provided by the present application;

[0025] Figure 3 A three-dimensional structural schematic view of a liquid cooling pipe provided by the present application;

[0026] Figure 4 A top view of a schematic diagram of an energy storage device provided in the present application;

[0027] Figure 5 A side view of a schematic diagram of an energy storage device provided in the present application;

[0028] Figure 6 A partial view of a schematic diagram of a bottom plate in an energy storage device provided in the present application;

[0029] Figure 7 A Figure 5 A side view of a schematic diagram of an energy storage device provided in the present application;

[0030] Figure 8 A connection path of a schematic diagram of a flow guide pipe and a cluster-level liquid return pipe in an energy storage device provided in the present application;

[0031] Figure 9 A partial view of a schematic diagram of an energy storage device provided in the present application;

[0032] Figure 10 A partial view of a schematic diagram of a connection of an exhaust valve and a flow guide pipe in an energy storage device provided in the present application;

[0033] Figure 11 A partial view of a schematic diagram of a connection of an exhaust valve and a flow guide pipe in an energy storage device provided in the present application;

[0034] Explanation of reference signs:

[0035] 1000, energy storage device; 100, box body; 110, top plate; 120, bottom plate; 121, pipe groove; 122, floor drain pipe; 123, support area; 123a, liquid discharge port; 124, hollow area; 124a, hollow cavity; 130a, battery rack; 130, stand column; 140, door column; 150, door plate; 160, slide; 200, battery cluster; 210, battery pack; 211, reversing interface; 300a, liquid cooling unit; 400, liquid cooling pipe; 410, main-level liquid supply pipe; 420, main-level liquid return pipe; 430, cluster-level liquid supply pipe; 440, cluster-level liquid return pipe; 450, liquid supply branch pipe; 460, liquid return branch pipe; 500, exhaust valve; 600, flow guide pipe; 610, first section; 620, second section; 700, liquid discharge pipe; 800, clamp; 900, adapter; 910, first connection port; 920, second connection port. DETAILED DESCRIPTION

[0036] The energy storage device plays an important role in the process of new energy power generation (such as wind power generation, photovoltaic power generation, etc.). Through the storage and release of energy, the energy storage device can make the power generation system stable, provide energy backup, and improve the power quality, and has good application prospect. The energy storage device can include a battery cluster and a power conversion unit. The battery cluster is used to store and release energy, and the power conversion unit is used to convert the energy provided by the energy storage unit and provide it to the load. The power conversion unit can also convert the energy from the power grid or other power generation elements and provide it to the battery cluster. The energy storage device can be applied in data centers or power stations.

[0037] With the development of energy storage devices, the energy density of energy storage devices is increasingly valued. A large amount of heat energy may be generated during the operation (discharge or charge) of the energy storage device, which not only reduces the service life of the energy storage device, but also threatens the use safety of the energy storage device.

[0038] A liquid cooling system is provided in the energy storage device to circulate the cooling liquid in the liquid cooling system to cool the energy storage device, which can reduce the temperature of the energy storage device during operation. However, the liquid cooling system has pipelines, and unreasonable arrangement of the pipelines has a negative impact on the energy density of the energy storage device.

[0039] In view of this, the present application provides an energy storage device with a liquid cooling pipeline, which aims to solve the problem of unreasonable arrangement of the pipeline and reduce the energy density of the energy storage device.

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings.

[0041] For the convenience of understanding, the length direction of the box body 100 is defined as the X-axis direction, the depth direction of the box body 100 is defined as the Y-axis direction, and the height direction of the box body 100 is defined as the Z-axis direction.

[0042] Please refer to Figure 1 , Figure 2 and Figure 3 In the embodiments provided by the present application, the energy storage device 1000 includes a box body 100, a battery cluster 200, a battery rack 130a, a plurality of door columns 140, a door plate 150 and a liquid cooling pipeline 400. One door plate 150 is hinged to one door column 140. In order to facilitate the installation and maintenance of the battery cluster 200, the door plate 150 is hinged to the door column 140, and the door plate 150 can rotate relative to the door column 140 to realize the switching between the open door state and the closed door state. When the door plate 150 is in the open door state, it can facilitate the user to disassemble and maintain the battery cluster 200. When the door plate 150 is in the closed door state, the door plate 150 can protect the battery cluster 200, prevent the battery cluster 200 from directly contacting with the external environment, and improve the service life of the energy storage device 1000.

[0043] Since the door plate 150 of the energy storage device 1000 has the needs of opening and closing, in order to prevent the door plate 150 and the battery cluster 200 from interfering, a certain space needs to be reserved between the door plate 150 and the battery cluster 200 when the door plate 150 is in the closed state. In the present application, the box body 100 includes a top plate 110 and a bottom plate 120, and the top plate 110 and the bottom plate 120 are arranged in the height direction of the box body 100. The battery rack 130a is located in the accommodating space formed by the door column 140, the door plate 150 and the box body 100, specifically, the battery rack 130a is located between the top plate 110 and the bottom plate 120, and the bottom plate 120 supports the battery rack 130a. The battery rack 130a is used to place a plurality of battery packs 210, and the battery rack 130a includes a plurality of columns 130 arranged in a row in the length direction of the box body 100, and each column 130 connects the top plate 110 and the bottom plate 120. Each of the plurality of door columns 140 extends in the height direction of the box body 100, and the plurality of door columns 140 are arranged in a row in the length direction of the box body 100, and each door column 140 connects the top plate 110 and the bottom plate 120. The battery cluster 200 includes a plurality of battery packs 210 arranged in the height direction of the box body 100, and the plurality of battery packs 210 are arranged on the battery rack 130a, and the plurality of battery packs 210 in the battery cluster 200 are located between the top plate 110 and the bottom plate 120.

[0044] The row of door columns 140 and the row of columns 130 are arranged in the depth direction of the box body 100, and the liquid cooling pipe 400 is arranged in the gap between the row of door columns 140 and the row of columns 130 in the depth direction of the box body 100. The liquid cooling pipe 400 is used to supply cooling liquid to the battery pack 210, and the liquid cooling pipe 400 includes a main liquid cooling pipe, a cluster liquid cooling pipe, a plurality of liquid supply branches 450 and a plurality of liquid return branches 460. The cluster liquid cooling pipe extends in the height direction of the box body 100, and the cluster liquid cooling pipe is arranged in the gap between the door column 140 and the column 130. The door column 140 and the door plate 150 are hinged, and a certain space needs to be reserved between the door plate 150 and the battery pack 210 to prevent the door plate 150 from colliding or interfering with the battery pack 210 when the door plate 150 is opened and closed. The cluster liquid cooling pipe is arranged in the gap between the door column 140 and the column 130, which can effectively utilize the space utilization rate of the energy storage device 1000 and improve the energy density of the energy storage device 1000. In the present application, the main liquid cooling pipe, the cluster liquid cooling pipe, the plurality of liquid supply branches 450 and the plurality of liquid return branches 460 supply liquid to the plurality of battery packs 210, and the layout of the liquid cooling pipe 400 is simple, which can save the space of the energy storage device 1000 and improve the energy density of the energy storage device 1000.

[0045] In the embodiments provided in the present application, the size of the cluster-level liquid cooling pipeline in the length direction of the box 100 is less than or equal to the size of the column 130, wherein in the length direction of the box 100, the battery pack 210 is located between two adjacent columns 130. Since the size of the cluster-level liquid cooling pipeline in the length direction of the box 100 is less than or equal to the size of the column 130, the cluster-level liquid cooling pipeline does not occupy the space in the depth direction of the box 100 in front of the battery pack 210, and does not interfere with the maintenance or repair of the battery pack 210. The cluster-level liquid cooling pipeline can be a circular pipe, and if the cluster-level liquid cooling pipeline is a circular pipe, the diameter of the cluster-level liquid cooling pipeline is less than the size of the column 130 in the length direction of the box 100.

[0046] The size of the cluster-level liquid cooling pipeline in the length direction of the box 100 is less than or equal to the size of the column 130. Since the size of the cluster-level liquid cooling pipeline in the length direction of the box 100 is less than or equal to the size of the column 130, the cluster-level liquid cooling pipeline does not occupy the space in the depth direction of the box 100 behind the door panel 150, and the cluster-level liquid cooling pipeline does not interfere with the opening and closing of the door panel 150. When the cluster-level liquid cooling pipeline is a circular pipe, the diameter of the cluster-level liquid cooling pipeline is less than the size of the column 130 in the length direction of the box 100.

[0047] The main-level liquid cooling pipeline communicates with the cluster-level liquid cooling pipeline, the main-level liquid cooling pipeline is below the cluster-level liquid cooling pipeline, and the main-level liquid cooling pipeline extends in the length direction of the box 100. The cluster-level liquid cooling pipeline is located in the gap between the column 130 and the door column 140, the main-level liquid cooling pipeline is below the cluster-level liquid cooling pipeline, and the main-level liquid cooling pipeline extends in the length direction of the box 100, so that the main-level liquid cooling pipeline does not occupy additional space of the energy storage device 1000, which is beneficial to improve the energy density of the energy storage device 1000. In the height direction of the box 100, the size of the pipe groove 121 is greater than or equal to the size of the main-level liquid cooling pipeline. It can be obtained that the pipe groove 121 can completely accommodate the main-level liquid cooling pipeline, the upper surface of the main-level liquid cooling pipeline is lower than the upper surface of the bottom plate 120, the main-level liquid cooling pipeline does not occupy the space in front of the battery pack 210 in the depth direction of the box 100, and does not interfere with the maintenance or repair of the battery pack 210.

[0048] In the embodiments provided in the present application, please refer to Figure 4The cluster-level liquid cooling pipeline includes a cluster-level liquid supply pipeline 430 and a cluster-level liquid return pipeline 440. Both the cluster-level liquid supply pipeline 430 and the cluster-level liquid return pipeline 440 are located between the door column 140 and the vertical column 130 and extend along the height direction of the box body 100. The cluster-level liquid supply pipeline 430 is in communication with the battery pack and is used to supply the battery pack with cooling liquid. The cluster-level liquid return pipeline 440 is in communication with the battery pack, and the cooling liquid returns to the cluster-level liquid return pipeline 440 from the battery pack when circulating in the battery pack. Both the cluster-level liquid supply pipeline 430 and the cluster-level liquid return pipeline 440 are located in the gap between the door column 140 and the vertical column 130. On the one hand, the gap between the door column 140 and the vertical column 130 can be effectively utilized to improve the energy density of the energy storage device 1000. On the other hand, the arrangement of the cluster-level liquid supply pipeline 430 and the cluster-level liquid return pipeline 440 is more regular, which can more reasonably utilize the space of the energy storage device 1000 and improve the energy density of the energy storage device 1000. In the length direction of the box body 100, the size of the cluster-level liquid supply pipeline 430 is less than or equal to the size of the vertical column 130, and the size of the cluster-level liquid supply pipeline 430 is less than or equal to the size of the door column 140. In the length direction of the box body 100, the size of the cluster-level liquid return pipeline 440 is less than or equal to the size of the vertical column 130, and the size of the cluster-level liquid return pipeline 440 is less than or equal to the size of the door column 140. Neither the cluster-level liquid supply pipeline 430 nor the cluster-level liquid return pipeline 440 occupies the space in the depth direction of the box body 100 in front of the battery pack 210. In this application, in the closed door state, the door panel 150 closes the door opening surrounded by the top plate 110, the bottom plate 120, and two adjacent door columns 140. At this time, the door panel 150 and the door column 140 are arranged along the length direction of the box body 100, and the positions of the cluster-level liquid supply pipeline 430 and the cluster-level liquid return pipeline 440 do not affect the opening and closing state of the door panel 150. In addition, since the cluster-level liquid supply pipeline 430 and the cluster-level liquid return pipeline 440 are not located in the door opening surrounded by the top plate, the bottom plate, and two adjacent door columns, when it is necessary to remove the battery cluster in the energy storage device 1000, the positions of the cluster-level liquid supply pipeline 430 and the cluster-level liquid return pipeline 440 do not hinder the removal of the battery cluster, thereby reducing the difficulty of disassembling the battery cluster in the energy storage device 1000. In a row of door columns 140, every two adjacent door columns 140, the bottom plate, and the top plate surround a door opening, and each door opening corresponds to a door panel. The door panel can close the corresponding door opening in the closed door state.

[0049] See Figure 5The primary liquid cooling pipeline includes a primary liquid supply pipeline 410 and a primary liquid return pipeline 420. The primary liquid supply pipeline 410 and the primary liquid return pipeline 420 extend along the length direction of the box body 100. The primary liquid supply pipeline 410 and the primary liquid return pipeline 420 are arranged along the depth direction of the box body 100. The primary liquid supply pipeline 410 is arranged below the cluster liquid supply pipeline 430 and communicates with the cluster liquid supply pipeline 430. The primary liquid return pipeline 420 is below the cluster liquid return pipeline 440 and communicates with the cluster liquid return pipeline 440.

[0050] The primary liquid supply pipeline 410, the primary liquid return pipeline 420, the cluster liquid supply pipeline 430, the cluster liquid return pipeline 440, the plurality of liquid supply branch pipelines 450, and the plurality of liquid return branch pipelines 460 are arranged on one side of the battery pack along the depth direction of the box body 100. If the liquid cooling pipeline 400 leaks, the leaked cooling liquid will first gather on the front side of the battery pack along the depth direction. The leaked cooling liquid will not directly contact the battery pack 210, and will not bring negative effects (such as causing short circuit of the battery pack) to the battery pack. The primary liquid supply pipeline 410, the primary liquid return pipeline 420, the cluster liquid supply pipeline 430, the cluster liquid return pipeline 440, the plurality of liquid supply branch pipelines 450, and the plurality of liquid return branch pipelines 460 are arranged on one side of the battery pack along the depth direction of the box body 100. This makes the layout of the liquid cooling pipeline more simple and facilitates disassembly and assembly of the liquid cooling pipeline.

[0051] In the embodiments provided in the present application, the box 100 comprises a bottom plate 120 for supporting the battery rack. Specifically, the bottom plate 120 can also support the main liquid cooling pipeline. The upper surface of the bottom plate 120 is recessed with a pipe groove 121 for accommodating the main liquid cooling pipeline. The size of the pipe groove 121 in the height direction of the box 100 is greater than or equal to the size of the main liquid cooling pipeline. It can be obtained that the pipe groove 121 can completely accommodate the main liquid cooling pipeline, the upper surface of the main liquid cooling pipeline will be lower than the upper surface of the bottom plate 120, the main liquid cooling pipeline will not occupy the space of the battery pack 210 in the front along the depth direction of the box 100, and will not interfere with the maintenance of the battery pack 210. Specifically, the main liquid supply pipeline 410 and the main liquid return pipeline 420 are arranged in the pipe groove 121 along the depth direction of the box 100, which can effectively utilize the space of the pipe groove 121, improve the energy density of the energy storage device 1000, and also make the arrangement of the main liquid supply pipeline 410 and the main liquid return pipeline 420 more regular, so that the space of the energy storage device 1000 can be more reasonably utilized and the energy density of the energy storage device 1000 can be improved. The size of the main liquid supply pipeline 410 in the height direction of the box 100 is lower than the height of the pipe groove 121, the size of the main liquid return pipeline 420 in the height direction is lower than the height of the pipe groove 121, and the main liquid supply pipeline 410 and the main liquid return pipeline 420 are completely in the pipe groove 121. The main liquid supply pipeline 410 and the main liquid return pipeline 420 will not occupy the space above the upper surface of the bottom plate 120, saving the space of the energy storage device 1000 in the height direction. It should be noted that the bottom plate 120 needs to have a certain thickness (the thickness direction of the bottom plate 120 is consistent with the height direction of the box 100), and the pipe groove 121 for accommodating the main liquid supply pipeline 410 and the main liquid return pipeline 420 is formed by recessing the upper surface of the bottom plate 120 downward, which can effectively improve the space utilization rate of the energy storage device 1000 and improve the energy density of the energy storage device 1000. Since the pipe groove 121 is recessed downward from the bottom plate 120, the opening of the pipe groove 121 is upward. When installing the main liquid supply pipeline 410 and the main liquid return pipeline 420, the main liquid supply pipeline 410 and the main liquid return pipeline 420 can be placed into the pipe groove 121 from the opening of the pipe groove 121, which is very convenient for the installation of the pipe groove 121. The upper surface of the bottom plate 120 is recessed downward to form the pipe groove 121, and the pipe groove 121 is used to accommodate the main liquid supply pipeline 410 and the main liquid return pipeline 420. In the height direction, the main liquid supply pipeline 410 and the cluster liquid supply pipeline 430 will be lower than the upper surface of the bottom plate 120. If the main liquid supply pipeline 410 and / or the cluster liquid supply pipeline 430 leaks, the pipe groove 121 can accommodate a certain amount of cooling liquid, so that the cooling liquid is not easy to directly contact the battery pack 210 and cause negative effects (short circuit of the battery pack 210) on the battery pack 210.

[0052] See Figure 6The bottom plate 120 includes a support area 123 and a hollow area 124 in the depth direction of the cabinet 100, the support area 123 is used for the plurality of columns, the support area 123 extends in the length direction of the cabinet 100, the support area 123 can be a square tube, and the plurality of columns 130 are connected to the upper surface of the support area 123. The hollow area 124 is located below the plurality of battery packs, the hollow area 124 has a hollow cavity 124a, and the pipe groove 121 is located on the side of the support area 123 away from the hollow area 124. Since the pipe groove 121 is located on the side of the support area 123 away from the hollow area 124, the pipe groove 121 is used to accommodate the main liquid supply pipeline, the main liquid supply pipeline is located below the cluster liquid supply pipeline, and in the depth direction of the cabinet, the cluster liquid supply pipeline is located in the gap between the column and the door column. It can be obtained that the pipe groove 121 is closer to the door column than the hollow area 124, the hollow area 124 is below the battery pack, and the hollow area 124 of the bottom plate 120 can isolate the ground and the battery pack, so that the battery pack is not easy to be damp. The bottom plate 120 is also provided with a floor drain pipe 122, one end of the floor drain pipe 122 is communicated to the pipe groove 121, and the other end of the floor drain pipe 122 is communicated to the hollow cavity 124a of the bottom plate 120. It should be noted that the pipe groove 121 is upwardly open, if the main liquid supply pipeline or the main liquid return pipeline leaks, the floor drain pipe 122 can drain the leaked cooling liquid in the main liquid supply pipeline or the main liquid return pipeline to the hollow cavity 124a, and then drain it from the hollow cavity 124a, to prevent the cooling liquid from overflowing from the pipe groove 121 and causing the bottom plate 120 to accumulate liquid, so that the battery pack 210 is damp.

[0053] In the embodiments provided in the present application, continuing to refer to Figure 1 The energy storage device 1000 further includes a liquid cooling unit 300a, and the liquid cooling unit 300a is arranged in the cabinet 100. The liquid cooling unit 300a is communicated with the main liquid supply pipeline 410, and the liquid cooling unit 300a is also communicated with the cluster liquid return pipeline 440. The liquid cooling unit 300a is used to absorb the heat of the cooling liquid, so as to reduce the temperature of the cooling liquid, so that the cooling liquid can circulate to absorb the heat of the battery pack 210.

[0054] Specifically, a plurality of liquid supply branch pipes 450 are arranged on the cluster-level liquid supply pipeline 430 at intervals in the height direction, and each liquid supply branch pipe 450 communicates the cluster-level liquid supply pipeline 430 and one battery pack 210 of the battery cluster 200. The main-level liquid return pipeline 420 communicates with the cluster-level liquid return pipeline 440, and the cluster-level liquid return pipeline 440 is arranged at intervals in the height direction and has a plurality of liquid return branch pipes 460, each of which communicates the cluster-level liquid return pipeline 440 and one battery pack 210 of the battery cluster 200. The cooling liquid flows from the liquid cooling unit 300a through the main-level liquid supply pipeline 410, the cluster-level liquid supply pipeline 430, the liquid supply branch pipe 450, and the plurality of battery packs 210 in sequence, enters the plurality of battery packs 210 to absorb the heat of the battery packs 210, and then returns to the liquid cooling unit 300a through the liquid return branch pipe 460, the cluster-level liquid return pipeline 440, and the main-level liquid return pipeline 420, and the liquid cooling unit 300a absorbs the heat of the cooling liquid and discharges it into the main-level liquid supply pipeline 410, thereby circulating and enabling the cooling liquid to continuously absorb the heat of the battery packs 210, thereby continuously reducing the temperature of the battery packs 210 to improve the safety performance of the battery packs 210. The number of battery clusters 200 can be multiple clusters, and the multiple clusters of battery clusters 200 are arranged at intervals along the length direction of the box body 100, and along the length direction of the box body 100, each cluster of battery clusters 200 is located between two adjacent vertical columns 130. The multiple clusters of battery clusters 200 are located on the same side of the liquid cooling unit 300a along the length direction of the box body 100. Each cluster of battery clusters 200 corresponds to a cluster-level liquid supply pipeline 430 and a cluster-level liquid return pipeline 440. The plurality of cluster-level liquid supply pipelines 430 are arranged at intervals along the length direction of the box body 100, and the plurality of cluster-level liquid return pipelines 440 are arranged at intervals along the length direction of the box body 100. When the cooling liquid flows in the main-level liquid supply pipeline 410 to flow into each battery cluster 200, the cooling liquid flows in sequence along the arrangement direction (X-axis positive direction) of the liquid cooling unit 300a and the plurality of battery clusters 200, and the flow direction of the cooling liquid in the main-level liquid supply pipeline 410 does not need to be changed, thereby saving the reversing interface 211 arranged on the main-level liquid supply pipeline 410. When the cooling liquid flows in the main-level liquid return pipeline 420 to return to the liquid cooling unit 300a, the cooling liquid flows in sequence along the arrangement direction (X-axis negative direction) of the plurality of battery clusters 200 and the liquid cooling unit 300a, and the flow direction of the cooling liquid in the main-level liquid return pipeline 420 also does not need to be changed, thereby saving the reversing interface 211 arranged on the main-level liquid return pipeline 420, and further saving the space of the energy storage device 1000 and improving the energy density of the energy storage device 1000.When the liquid cooling unit 300a supplies the battery cluster 200 with the cooling liquid through the main-stage liquid supply pipeline 410 and the cluster-stage liquid supply pipeline 430, the cooling liquid flows in the main-stage liquid supply pipeline 410 along the positive direction of the X axis, and when the cooling liquid in the battery cluster 200 flows back to the liquid cooling unit 300a through the cluster-stage liquid return pipeline 440 and the main-stage liquid return pipeline 420, the cooling liquid flows in the main-stage liquid return pipeline 420 along the negative direction of the X axis. The cooling liquid flows in the main-stage liquid supply pipeline 410 and the main-stage liquid return pipeline 420 without changing the direction, which can reduce the flow resistance of the cooling liquid, improve the flow speed of the cooling liquid, shorten the circulation period of the cooling liquid, and further improve the efficiency of the cooling liquid in cooling the battery cluster 200.

[0055] In the embodiments provided in the present application, continue to refer to Figure 3 In each column of the stand column 130, a plurality of slides 160 extending along the depth direction of the box body 100 are arranged, each slide 160 connects two stand columns 130 in the column, and the plurality of slides are arranged in the height direction of the box body 100, and the plurality of slides 160 are between the bottom plate 120 and the top plate 110. Wherein, each battery pack in the battery cluster is supported by two slides 160, and the two slides 160 supporting the battery pack are located on the adjacent two columns of stand columns 130. Each battery pack is supported by the slides 160 of the adjacent two columns of stand columns 130 in the gap, and after the battery pack and the stand column 130 are removed from the fixed part, the battery pack and the slide 160 can slide relative to each other, facilitating the removal of the battery pack. When assembling the battery pack, the battery pack and the slide 160 can slide relative to each other, facilitating the movement of the battery pack to the corresponding position of the slide 160, and facilitating the installation of the battery pack into the box body 100.

[0056] In the energy storage device 1000 provided in the present application, the lowermost slide 160 in each column of stand columns 130 has a gap with the bottom plate 120, each battery pack in the battery cluster is supported by two slides 160 arranged on two adjacent stand columns 130, and the lowermost battery pack 210 in the battery cluster 200 has a gap between the bottom plate 120, so that when the bottom plate 120 is wet or accumulates liquid, the lowermost battery pack 210 is less likely to short circuit due to moisture, and the safety performance of each battery pack 210 can be improved.

[0057] In the embodiments provided in the present application, all battery clusters 200 are located on the same side of the liquid cooling unit 300a along the length direction of the box body 100, and the main-stage liquid supply pipeline 410 extends along the length direction of the box body 100, and the main-stage liquid return pipeline 420 extends along the length direction of the box body 100.

[0058] In the present application, please refer to Figure 7 and Figure 8The cluster-level liquid return pipeline 440 is located in the gap between the stand 130 and the door column 140, and the end of the cluster-level liquid return pipeline 440 away from the bottom plate 120 in the direction of the height of the tank body is in communication with the exhaust valve 500. The bottom plate 120 further comprises a liquid discharge port 123a which penetrates the bottom plate 120. The energy storage device further comprises a flow guide pipe 600, the first end of the flow guide pipe 600 is connected with the exhaust port of the exhaust valve 500, and the second end of the flow guide pipe 600 is in communication with the liquid discharge port 123a. When the gas pressure in the cluster-level liquid return pipeline 440 reaches a certain value, the exhaust valve 500 can automatically discharge the gas. The gas in the cluster-level liquid return pipeline 440 is discharged through the exhaust valve 500, which can improve the liquid cooling performance of the energy storage device 1000. It should be noted that during the liquid cooling process of the energy storage device, if the liquid cooling medium in the liquid cooling pipeline contains too much gas, the liquid cooling performance of the energy storage device will be greatly reduced (the specific heat capacity of the liquid cooling medium (water) is much larger than that of the gas).

[0059] When the exhaust valve 500 discharges the gas in the cluster-level liquid return pipeline 440, the gas is easy to carry part of the liquid in the cluster-level liquid return pipeline 440 out, and the liquid carried by the gas will remain in the tank body 100, which will bring safety hazards to the energy storage device 1000. By connecting the flow guide pipe 600 with the exhaust port of the exhaust valve 500, the gas and the liquid carried by the gas are discharged together to the lower side of the tank body 100 by the flow guide pipe 600, which can improve the safety performance of the energy storage device.

[0060] Please refer to Figure 7 and Figure 9The guide pipe 600 includes a first section 610 and a second section 620 that are connected. The first section 610 extends along the height direction of the box, and the second section 620 extends along the depth direction of the box. The end of the first section 610 away from the second section 620 is connected to the exhaust port of the exhaust valve 500, and the end of the second section 620 away from the first section 610 is connected to the drain port 123a. In the depth direction of the box, the bottom plate 120 includes two support areas that extend along the length direction of the box for supporting multiple columns. The drain port is located in one of the support areas 123 near the door column. The guide pipe 600, through the connected first section 610 and second section 620, can guide the liquid entrained by the gas to the drain port 123a. The first section 610 extends along the height direction of the box, and the second section 620 extends along the depth direction of the box, making the guide pipe 600 relatively regular in shape. Since the cluster-level liquid cooling pipeline is located in the gap between the door column and the upright column, that is, the cluster-level return liquid pipeline 440 is also located in the gap between the upright column 130 and the door column 140, the drain port 123a is located in the support area 123 near the door column in the two support areas. Since the first section 610 is connected to the cluster-level return liquid pipeline 440 through the exhaust valve 500, the support area 123 near the door column in the two support areas will also be relatively close to the first section 610. In this way, setting the drain port 123a in the support area 123 near the door column in the two support areas can reduce the size of the second section 620 in the depth direction of the box. The first segment 610 is positioned within the gap between the gatepost 140 and the upright 130. By utilizing this gap, the energy storage device does not require additional space to house the first segment 610, thus improving its space utilization and consequently increasing its energy density. In the embodiment provided in this application, the support area 123 can be a hollow beam extending along the length of the box 100. The beam can be a steel structure with a "U"-shaped cross-section.

[0061] In this application, the drain outlet 123a is equipped with a drain pipe 700, the hardness of which is greater than that of the guide pipe 600. One end of the drain pipe 700 is connected to the second end of the guide pipe 600, and the other end of the drain pipe 700 is connected to the outside of the housing. The drain pipe 700 penetrates the support area 123, and the second end of the guide pipe 600 is fitted onto the drain pipe 700. By using a clamp to fit the second end of the guide pipe 600, the second end of the guide pipe 600 can be fixed onto the drain pipe 700. The guide pipe 600 can be a flexible hose, and the drain pipe 700 can be a steel pipe. The drain pipe 700 can be fixed to the support area 123 by welding. The drain pipe 700 can discharge the liquid entrained by the gas to the outside of the support area 123, preventing the liquid entrained by the gas from accumulating in the support area 123. It should be noted that if liquid accumulates in the support area 123 of the steel structure, it can easily cause the support area 123 to rust.

[0062] In some embodiments, referring to Figure 10 The flow guide pipe 600 is directly sleeved on the exhaust port of the exhaust valve 500, and the flow guide pipe 600 is fixed on the exhaust port of the exhaust valve 500 by the clamp 800. Specifically, the flow guide pipe 600 is sleeved on the exhaust port of the exhaust valve 500, the clamp 800 surrounds the area of the flow guide pipe 600 sleeved on the exhaust port, and the clamp 800 clamps the flow guide pipe 600 to fix the first end of the flow guide pipe 600 on the exhaust port of the exhaust valve 500, thereby improving the connection stability of the flow guide pipe and the exhaust valve.

[0063] In some embodiments, referring to Figure 11 The energy storage device further includes an adapter 900, the adapter 900 has a first connection port 910 opening toward the height direction of the box body and a second connection port 920 opening toward the depth direction of the box body, and the first connection port 910 and the second connection port 920 are in communication. Specifically, the first connection port 910 opens downward, and the exhaust port of the exhaust valve 500 opens upward. The adapter 900 is located in the gap between the door column 140 and the vertical column 130, the opening of the second connection port 920 faces the side where the vertical column 130 is located, and the openings of the first connection port 910 and the second connection port 920 form an included angle of 90°. The first connection port 910 is in communication with the exhaust port, and the second connection port 920 is in communication with the first end of the flow guide pipe 600. The flow guide pipe 600 needs to guide the liquid entrained by the gas downward the box body, and by connecting the first end of the flow guide pipe 600 with the second connection port 920, the bending angle of the flow guide pipe 600 can be reduced, thereby reducing the installation difficulty of the flow guide pipe 600. Connecting the exhaust valve 500 and the flow guide pipe 600 through the adapter 900 can also improve the connection stability of the flow guide pipe 600 and the exhaust valve 500.

[0064] The first, second, third, fourth, and various numerical designations referred to herein are merely used for differentiation for the convenience of description, and are not intended to limit the scope of the present application.

[0065] It should be understood that the size of the sequence number of each process described above in various embodiments of the present application does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage device having a liquid cooling circuit, characterized by, The energy storage device comprises: a box body; a plurality of door columns extending in the height direction of the box body, the plurality of door columns being arranged in a row in the length direction of the box body, each of the plurality of door columns being used for being hingedly connected with a door plate; a battery rack for placing a plurality of battery packs, the battery rack being located in a containing space formed by the door columns, the door plates and the box body, the battery rack comprising a plurality of vertical columns extending in the height direction, the plurality of vertical columns being arranged in a row in the length direction of the box body, each of the door columns in the row being arranged in the depth direction of the box body away from one of the vertical columns in the row; a cluster-level liquid cooling pipeline extending in the height direction, the cluster-level liquid cooling pipeline being arranged in the gap between the door columns and the vertical columns.

2. The energy storage device of claim 1, wherein, In the length direction of the box body, the size of the cluster-level liquid cooling pipeline is less than or equal to the size of the door column.

3. The energy storage device of claim 1 or 2, wherein, In the length direction of the box body, the size of the cluster-level liquid cooling pipeline is less than or equal to the size of the vertical column.

4. The energy storage device of claim 1, wherein, The cluster-level liquid cooling pipeline comprises a cluster-level liquid supply pipeline and a cluster-level liquid return pipeline, both of which extend in the height direction of the box body, are located in the gap between the door columns and the vertical columns, and are arranged in the depth direction of the box body.

5. The energy storage device of claim 1, wherein, The energy storage device further comprises a main-level liquid cooling pipeline extending in the length direction of the box body, the main-level liquid cooling pipeline being arranged below the cluster-level liquid cooling pipeline and being in communication with the cluster-level liquid cooling pipeline.

6. The energy storage device of claim 5, wherein, The box body comprises a bottom plate for supporting the battery rack, the upper surface of the bottom plate being concave downward to form a pipe groove for accommodating the main-level liquid cooling pipeline.

7. The energy storage device of claim 6, wherein, In the height direction of the box body, the size of the pipe groove is greater than or equal to the size of the main-level liquid cooling pipeline.

8. The energy storage device of claim 6, wherein, The main-level liquid cooling pipeline comprises a main-level liquid supply pipeline and a main-level liquid return pipeline, both of which extend in the length direction of the box body, are arranged in the depth direction of the box body and are located in the pipe groove.

9. The energy storage device of claim 6, wherein, The bottom plate comprises a support area and a hollow area arranged in the depth direction of the box body, the upper surface of the support area being connected with the plurality of vertical columns, and the pipe groove being located on the side of the support area away from the hollow area.

10. The energy storage device of claim 9, wherein, The hollow area has a hollow cavity, and the bottom plate further comprises a floor drain pipe in communication with the pipe groove and the hollow cavity.

11. The energy storage device of claim 1, wherein, The cluster-level liquid cooling pipeline comprises a cluster-level liquid return pipeline extending in the height direction of the box body, the box body comprises a bottom plate for supporting the battery rack, one end of the cluster-level liquid return pipeline away from the bottom plate in the height direction is in communication with an exhaust valve, the bottom plate further comprises a liquid discharge port penetrating the bottom plate, and the energy storage device further comprises a flow guide pipe, a first end of the flow guide pipe is in communication with an exhaust port of the exhaust valve, and a second end of the flow guide pipe is in communication with the liquid discharge port.

12. The energy storage device of claim 11, wherein, The energy storage device further comprises a clamp, the flow guide pipe is sleeved on the exhaust port, and the clamp surrounds the area of the flow guide pipe sleeved on the exhaust port.

13. The energy storage device of claim 11, wherein the electrolyte comprises a lithium salt. The energy storage device further comprises a connector having a first connection port opening in the height direction of the cabinet and a second connection port opening in the depth direction of the cabinet, the first connection port and the second connection port being in communication, the first connection port being in communication with the exhaust port of the exhaust valve, and the second connection port being in communication with the first end of the flow guide pipe.

14. The energy storage device of claim 11, wherein, The flow guide pipe comprises a first section and a second section in communication, the first section extending in the height direction of the cabinet, and the second section extending in the depth direction of the cabinet, one end of the first section away from the second section being in communication with the exhaust port of the exhaust valve, and one end of the second section away from the first section being in communication with the liquid outlet, in the depth direction of the cabinet, the bottom plate comprising two support areas extending in the length direction of the cabinet for supporting a plurality of the upright columns, and the liquid outlet being arranged in one of the two support areas close to the door column.

15. The energy storage device of claim 14, wherein, The first section is arranged in the gap between the door column and the upright column.

16. The energy storage device of claim 11, wherein, The liquid outlet is provided with a liquid discharge pipe, the hardness of the liquid discharge pipe being greater than the hardness of the flow guide pipe, one end of the liquid discharge pipe being in communication with the second end of the flow guide pipe, and the other end of the liquid discharge pipe being in communication with the outside of the cabinet.

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