Liquid cooling energy storage system

Abstract

A liquid cooling energy storage system disclosed by the present application comprises a cabinet body, a battery compartment, a liquid cooling machine and an air duct main body, the cabinet body is provided with a top plate and a bottom plate which are oppositely arranged in a first direction, and a back plate connecting the top plate and the bottom plate, and the cabinet body is internally provided with a first water receiving plate and a second water receiving plate which are distributed in the first direction; the first water receiving plate is located on the side, away from the bottom plate, of the second water receiving plate, and drainage ports are formed in the first water receiving plate and the second water receiving plate and connected with pipelines; a back plate air outlet is formed in the back plate; the battery bin is arranged on the side, away from the second water receiving plate, of the first water receiving plate. The liquid cooling machine is arranged between the first water receiving plate and the second water receiving plate, the liquid cooling machine is provided with an air inlet and an air outlet, and the air outlet is opposite to the air outlet of the back plate; the air duct body is communicated with the air outlet and the back plate air outlet and is in sealing fit with the air outlet and the back plate air outlet. The liquid cooling energy storage system can solve the problem that an existing liquid cooling energy storage system is poor in heat dissipation and dehumidification effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage systems, in particular to a liquid-cooled energy storage system. BACKGROUND

[0002] The current mainstream of industrial and commercial distributed liquid-cooled energy storage systems adopts a combined heat dissipation mode of battery compartment liquid cooling and equipment compartment air cooling. Since the battery compartment is liquid-cooled, it does not need to be provided with a heat dissipation air duct or the like, so the IP protection level of the battery compartment is generally higher. However, the equipment compartment is basically air-cooled. Since the energy storage cabinet requires as small an occupied size as possible, the heat dissipation efficiency of the equipment and the high protection are contradictory. While improving the heat dissipation efficiency and reducing the air resistance, the occupied size will increase or the protection level will decrease. If the protection level is increased while the size of the cabinet remains unchanged, the air resistance will increase, thereby affecting the heat dissipation efficiency.

[0003] Currently, the mainstream energy storage integrators design the energy storage equipment in the form of a combination of battery compartment air-cooled air conditioning heat dissipation or liquid-cooled heat dissipation and device compartment air-cooled heat dissipation. The battery compartment can generally achieve a high protection level. However, due to the air-cooled heat dissipation form, the outlet is generally in the form of inclined louvers or labyrinth air chambers, considering the heat dissipation air resistance and the overall space of the cabinet. However, these two schemes have their own advantages and disadvantages.

[0004] The battery compartment generally uses a liquid-cooled machine or an air conditioner to dissipate heat from the battery. Since the temperature of the air conditioner outlet is low, condensate water will inevitably be generated in places with a large temperature difference between cold and hot during long-term operation. Some energy storage equipment manufacturers install dehumidifiers in the battery compartment to drain the condensate water or directly set a drain at the bottom of the battery compartment.

[0005] In summary, the existing technology has the following two problems:

[0006] 1. Most liquid-cooled energy storage cabinets currently ensure the overall protection level of the cabinet by arranging inclined louvers or labyrinth air chambers at the outlet of the equipment compartment. However, the inclined louvers form has relatively large air resistance, and the inclined louvers form has many parts, high cost, and a great impact on the heat dissipation efficiency of the device compartment. The labyrinth air chamber form has relatively low air resistance, but requires a large space, which affects the energy density of the liquid-cooled energy storage cabinet.

[0007] 2. The battery compartment dehumidification is mostly in the form of a dehumidifier, which reduces the humidity in the compartment and drains the condensate water outside the cabinet through a pipeline. However, to ensure the efficiency of the cabinet and due to the limited space in the cabinet, the size of the dehumidifier is generally small, resulting in condensate water on the battery cold plate. After a long period of operation, a large amount of water will accumulate at the bottom of the battery, causing a safety hazard in the bottom equipment compartment. Since the liquid-cooled machine is located in the device compartment, the temperature difference between the inlet and outlet of the liquid-cooled machine and the outside environment is large, which will continuously condense and drip water, causing a safety hazard to the bottom devices. Practical new content

[0008] The main purpose of the present application is to provide a kind of liquid cooling energy storage system, to solve the problem of poor heat dissipation and dehumidification of existing liquid cooling energy storage system.

[0009] To achieve the above object, the present application provides a kind of liquid cooling energy storage system, comprising: cabinet, battery compartment, liquid cooling machine and air duct main body, wherein the cabinet has the top plate and bottom plate oppositely arranged in the first direction, and the back plate connecting the top plate and the bottom plate, the inside of the cabinet is provided with the first water collecting plate and the second water collecting plate distributed in the first direction, and the first water collecting plate is located on the side of the second water collecting plate away from the bottom plate, wherein the first water collecting plate and the second water collecting plate are both provided with drain port, and the drain port is connected with pipeline;Back plate air outlet is arranged on the back plate;The battery compartment is arranged on the side of the first water collecting plate away from the second water collecting plate;The liquid cooling machine is arranged between the first water collecting plate and the second water collecting plate, the liquid cooling machine has an air inlet and an air outlet, and the air outlet is arranged opposite to the back plate air outlet;The air duct main body is connected with the air outlet and the back plate air outlet, and is sealed with the air outlet and the back plate air outlet.

[0010] Optionally, the back plate is further provided with: a plurality of back plate drain ports and water guide groove, wherein a plurality of back plate drain ports are spaced apart on the back plate, and each back plate drain port is located on the side of the back plate air outlet facing the bottom plate;The water guide groove is arranged on the inner side of the back plate, and the water guide groove is opposite to each back plate drain port.

[0011] Optionally, the water guide groove comprises: connecting portion, water guide portion and water retaining portion, wherein the connecting portion is arranged parallel to the back plate and connected to the back plate;The water guide portion is arranged on one side of the connecting portion and perpendicular to the connecting portion;The water retaining portion is arranged on one side of the water guide portion and perpendicular to the water guide portion;Wherein, the side of the water guide portion close to each back plate drain port is flush with each back plate drain port.

[0012] Optionally, the air duct main body comprises: air duct frame and two limiting portions, wherein the air duct frame has a through channel, and the first end of the channel is connected with the air outlet, and the second end is connected with the back plate air outlet;Two limiting portions are arranged at two ports of the air duct frame respectively;Wherein, the side of the air duct frame facing the bottom plate is inclinedly arranged, and the distance between the first end and the bottom plate in the first direction is greater than the distance between the second end and the bottom plate in the first direction;One of the limiting portions is sealed with the air outlet, and the other limiting portion is sealed with the back plate.

[0013] Optionally, a first sealing strip is arranged between one of the limiting parts and the air outlet; and a second sealing strip is arranged between the other limiting part and the back plate.

[0014] Optionally, the water outlet comprises a water receiving groove and a water outlet connector, wherein the water receiving groove is arranged on the first water receiving plate and the second water receiving plate; and the water outlet connector is connected to one side of the water receiving groove facing the bottom plate and connected to a pipeline at the other end.

[0015] Optionally, the length of the water outlet connector extending out of the water receiving groove is 2mm-5mm.

[0016] Optionally, the second water receiving plate is provided with a guide plate on the side facing the first water receiving plate, and an area is enclosed between the guide plate and the end edge of the second water receiving plate close to the air outlet; and the water outlet on the second water receiving plate close to the air outlet is located in the area.

[0017] Optionally, the first water receiving plate is provided with four water outlets; and the second water receiving plate is provided with three water outlets; wherein two of the water outlets on the second water receiving plate are located in the area, and the other water outlet is located at the end of the guide plate away from the air outlet.

[0018] Optionally, the back plate is further provided with a door lock.

[0019] The liquid cooling energy storage system provided in the embodiments of the present application is characterized in that when water enters the cabinet from the back plate air outlet provided on the back plate, most of the water is discharged from the air duct body, and the discharged water is discharged out of the cabinet from the air duct body along the back plate air outlet; a small part of the water enters the air outlet, and the water entering the air outlet flows downward along the air outlet to the second water receiving plate, and the water on the second water receiving plate is discharged from the water outlet formed thereon and discharged out of the cabinet through a pipeline; the condensate generated by the operation of the battery compartment falls on the first water receiving plate, and the condensate flows into the water outlet on the first water receiving plate and is discharged out of the cabinet through a pipeline; and the condensate generated by the operation of the liquid cooling machine falls on the second water receiving plate, and the condensate flows into the water outlet on the second water receiving plate and is discharged out of the cabinet through a pipeline. Through the above arrangement, the liquid cooling energy storage system has good heat dissipation and dehumidification effect, and there is no safety hazard due to the accumulation of water in the cabinet, and the overall structure is compact and the floor area is small. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the prior art and the present application, the drawings needed in the description of the prior art and the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0021] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present application. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes of the present application, should still fall within the scope of the disclosed technology.

[0022] Figure 1 Part structure schematic diagram of a liquid-cooled energy storage system provided by the embodiments of the present application;

[0023] Figure 2 Part structure sectional view of a liquid-cooled energy storage system provided by the embodiments of the present application;

[0024] Figure 3 For Figure 1 Structure schematic diagram of a liquid cooling machine;

[0025] Figure 4 For Figure 1 Structure schematic diagram of a wind channel main body;

[0026] Figure 5 For Figure 2 Structure schematic diagram of a back plate;

[0027] Figure 6 For Figure 5 Enlarged view of A part of the liquid cooling machine;

[0028] Figure 7 For Figure 2 Structure schematic diagram of a first water receiving plate and a second water receiving plate;

[0029] Figure 8 For Figure 7 Enlarged view of B part of the liquid cooling machine;

[0030] Figure 9 For Figure 2 Partial enlarged view from another perspective.

[0031] In the figure, 1, cabinet body; 101, first water receiving plate; 102, second water receiving plate; 103, back plate; 104, drain port; 105, back plate air outlet; 107, water receiving groove; 108, drain connector; 109, guide plate; 110, back plate drain port; 111, water guide groove; 112, door lock; 113, connecting part; 114, water guide part; 115, water blocking part; 2, liquid cooling machine; 201, air inlet; 202, air outlet; 3, air duct main body; 301, air duct frame; 302, limiting part; 4, first sealing strip; 5, second sealing strip.

[0032] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously meet the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0037] Please refer to Figures 1-9 The embodiment of the application provides a liquid cooling energy storage system, which can comprise: a cabinet body 1, a battery compartment, a liquid cooling machine 2 and an air duct main body 3, wherein the cabinet body 1 has a top plate and a bottom plate oppositely arranged in a first direction X, and a back plate 103 connecting the top plate and the bottom plate, the inside of the cabinet body 1 is provided with a first water receiving plate 101 and a second water receiving plate 102 distributed in the first direction X, and the first water receiving plate 101 is located on the side of the second water receiving plate 102 away from the bottom plate, wherein the first water receiving plate 101 and the second water receiving plate 102 are both provided with a drain port 104, and the drain port 104 is connected with a pipeline; the back plate 103 is provided with a back plate air outlet 105; the battery compartment is arranged on the side of the first water receiving plate 101 away from the second water receiving plate 102; the liquid cooling machine 2 is arranged between the first water receiving plate 101 and the second water receiving plate 102, and the liquid cooling machine 2 has an air inlet 201 and an air outlet 202, and the air outlet 202 is arranged opposite to the back plate air outlet 105; the air duct main body 3 is connected with the air outlet 202 and the back plate air outlet 105, and is in sealing fit with the air outlet 202 and the back plate air outlet 105.

[0038] It should be noted that: Figure 9 As shown, the arrow indicated by a represents the main drainage direction, the arrow indicated by b represents one of the drainage directions, the arrow indicated by c represents the other drainage direction, the arrow indicated by d represents the water inlet direction, and the arrow indicated by e represents the air outlet direction.

[0039] In the embodiment, when the moisture from the back plate air outlet 105 provided on the back plate 103 enters the cabinet 1, most of the moisture is discharged from the air duct body 3, and the discharged moisture is discharged from the air duct body 3 along the back plate air outlet 105 out of the cabinet 1; a small part of the moisture enters the air outlet 202, and the moisture entering the air outlet 202 flows downward along the air outlet 202 to the second water collecting plate 102, and the moisture on the second water collecting plate 102 is discharged from the drain hole 104 provided thereon and is discharged out of the cabinet 1 through the pipeline. In addition, the condensate generated by the operation of the battery compartment falls on the first water collecting plate 101, and this part of the condensate flows into the drain hole 104 on the first water collecting plate 101 and is discharged out of the cabinet 1 through the pipeline; the condensate generated by the operation of the liquid cooling machine 2 falls on the second water collecting plate 102, and this part of the condensate flows into the drain hole 104 on the second water collecting plate 102 and is discharged out of the cabinet 1 through the pipeline. Through the above arrangement, the heat dissipation and dehumidification effect of the liquid cooling energy storage system is good, there is no safety hidden danger due to the accumulation of moisture inside the cabinet 1, and the overall structure is also relatively compact, and the occupied area is small.

[0040] Please refer to Figure 5 , the back plate 103 is further provided with: a plurality of back plate drain holes 110 and a water guide groove 111, wherein the plurality of back plate drain holes 110 are spaced apart and provided on the back plate 103, and each back plate drain hole 110 is located on the side of the back plate air outlet 105 facing the bottom plate; the water guide groove 111 is provided on the inner side of the back plate 103, and the water guide groove 111 is opposite to each back plate drain hole 110.

[0041] Specifically, a part of the moisture (such as rainwater) entering the back plate 103 from the outside of the cabinet 1 will also seep into the sealing part between the air duct body 3 and the back plate 3 during flowing out of the back plate air outlet 105, thereby falling into the water guide groove 111. Since the water guide groove 111 is opposite to each back plate drain hole 110, the moisture in the water guide groove 111 will be discharged from the plurality of back plate drain holes 110, so that the moisture in the water guide groove 111 is discharged out of the cabinet 1, ensuring the dryness inside the cabinet 1, and the components inside the cabinet 1 will not be damaged.

[0042] Please refer to Figure 6 , the water guide groove 111 can include: a connecting portion 113, a water guide portion 114, and a water blocking portion 115, wherein the connecting portion 113 is parallel to the back plate 103 and connected to the back plate 103; the water guide portion 114 is provided on one side of the connecting portion 113 and perpendicular to the connecting portion 113; the water blocking portion 115 is provided on one side of the water guide portion 114 and perpendicular to the water guide portion 114; wherein the side of the water guide portion 114 close to each back plate drain hole 110 is flush with each back plate drain hole 110.

[0043] In the embodiment, the water guide groove 111 is divided into a connecting portion 113, a water guide portion 114 and a water blocking portion 115. The connecting portion 113 is used for fixing the whole water guide groove 111 (the water guide groove 111 can be fixed on the back plate 103 by means of bolt fixing); the water guide portion 114 is used for guiding the flow direction of the water droplets falling on the water guide groove 111; and the water blocking portion 115 is used for blocking the water droplets to avoid the water droplets flowing back to the inside of the cabinet 1. Meanwhile, the water guide groove 111 is divided into the connecting portion 113, the water guide portion 114 and the water blocking portion 115 by means of the above structural design, so that the water guide groove 111 is convenient to connect with the back plate 103 and convenient to manufacture.

[0044] Please refer to Figures 2-4 , the air duct body 3 can include an air duct frame 301 and two limiting portions 302. The air duct frame 301 has a through channel, and the first end of the channel is connected to the air outlet 202, and the second end is connected to the back plate air outlet 105. The two limiting portions 302 are respectively arranged at the two ports of the air duct frame 301. The side of the air duct frame 301 facing the bottom plate is arranged in an inclined manner, and the distance between the first end and the bottom plate in the first direction X is greater than the distance between the second end and the bottom plate in the first direction X. One limiting portion 302 is in sealing cooperation with the air outlet 202, and the other limiting portion 302 is in sealing cooperation with the back plate 103.

[0045] Specifically, the bottom surface of the air duct frame 301 is arranged as an inclined surface, which is beneficial to the water droplets entering the cabinet 1 from the back plate air outlet 105 to flow out of the cabinet 1 along the inclined surface of the air duct frame 301. The limiting portions 302 are arranged at the two ports of the air duct frame 301, which is convenient for the air duct body 3 to be in sealing cooperation with the air outlet 202 and the back plate 103 respectively.

[0046] In actual use, the first direction X is usually the height direction of the cabinet 1, so that the distance between the first end and the bottom plate in the first direction X is the height of the first end from the bottom plate, and similarly, the distance between the second end and the bottom plate in the first direction X is the height of the second end from the bottom plate. Accordingly, the distance between the first end of the channel and the bottom plate in the first direction X is greater than the distance between the second end of the channel and the bottom plate in the first direction X, which means that the height of the first end of the channel from the bottom plate is higher than the height of the second end of the channel from the bottom plate.

[0047] Please refer to Figure 4 , a first sealing strip 4 is arranged between one limiting portion 302 and the air outlet 202; and a second sealing strip 5 is arranged between the other limiting portion 302 and the back plate 103.

[0048] Further, the first sealing strip 4 and the second sealing strip 5 are arranged on the two limiting portions 302 of the air duct body 3 respectively, which ensures the sealing performance between the air duct body 3 and the air outlet 202 and the back plate 103.

[0049] It should be noted that the limiting part 302 matched with the air outlet 202 is detachably connected to the structure in the cabinet body 1 by bolts, so that the air outlet 202 is just opposite to the air duct body 3.

[0050] Please refer to Figure 7 、 Figure 8 , the drain 104 can include: water receiving grooves 107 and a drain connector 108, wherein the water receiving grooves 107 are arranged on the first water receiving plate 101 and the second water receiving plate 102; the drain connector 108 is connected to one end of the water receiving groove 107 on the side facing the bottom plate, and the other end is connected to a pipeline.

[0051] In this embodiment, the moisture on the first water receiving plate 101 or the second water receiving plate 102 is collected in the respective water receiving grooves 107, and then enters the drain connector 108, which is connected to the pipeline, thereby draining the moisture on the first water receiving plate 101 or the second water receiving plate 102 from the cabinet body 1, avoiding the influence of the moisture in the cabinet body 1 on the normal operation of other components in the cabinet body 1, and keeping the cabinet body 1 dry at all times.

[0052] Among them, the water receiving groove 107 is a downwardly recessed circular structure, the drain connector 108 is connected to the middle part of the recessed circular structure, and the lower end of the drain connector 108 is exposed for connection with the pipeline. It should be noted that the pipeline connected to the drain connector 108 is preferably a hose. The reason is that the hose has strong operability and high flexibility, and is convenient for draining the moisture on the first water receiving plate 101 or the second water receiving plate 102 from the cabinet body 1.

[0053] Further, the length of the drain connector 108 extending out of the water receiving groove 107 is 2mm-5mm.

[0054] Specifically, the length of the drain connector 108 extending out of the water receiving groove 107 can be 2mm, 3mm, 4mm, or 5mm. The length of the extension is mainly to facilitate the connection of the pipeline to drain the moisture remaining on the first water receiving plate 101 and the second water receiving plate 102, so as to keep the first water receiving plate 101 and the second water receiving plate 102 dry and not to cause damage to the components in the cabinet body 1.

[0055] Please refer to Figure 7 、 Figure 9 , the second water receiving plate 102 is provided with a guide plate 109 on the side facing the first water receiving plate 101, and a region is enclosed between the guide plate 109 and the end edge of the second water receiving plate 102 close to the air outlet 202, and the drain 104 on the second water receiving plate 102 close to the air outlet 202 is located in the region.

[0056] The guiding plate 109 is an "L" shaped plate, i.e. the guiding plate 109 is composed of two mutually perpendicular plates. The guiding plate 109 is arranged at one side of the drain port 104, so that the side edge of the second water receiving plate 102 and the guiding plate 109 enclose a relatively closed area. When water drops into the area, the water drops will be directly drained from the drain port 104, so as to ensure that a large amount of water will not stay on the second water receiving plate 102 for too long, thereby keeping the second water receiving plate 102 dry.

[0057] Please refer to Figure 7 The first water receiving plate 101 is provided with four drain ports 104; the second water receiving plate 102 is provided with three drain ports 104; of which, two drain ports 104 on the second water receiving plate 102 are located in the above-mentioned area, and the other drain port 104 is located at the end of the guiding plate 109 away from the air outlet 202.

[0058] The four drain ports 104 are arranged on the first water receiving plate 101, and the four drain ports 104 are respectively distributed at the four corners of the first water receiving plate 101, so as to facilitate the condensed water generated in the battery compartment during operation to flow into the drain ports 104 as soon as possible, so as to be drained out of the cabinet 1 through the pipeline. The three drain ports 104 are arranged on the second water receiving plate 102, and the three drain ports 104 are also arranged at the corners of the second water receiving plate, which is beneficial to drain the water on the second water receiving plate 102 out of the cabinet 1 through the pipeline as soon as possible. It should be noted that the arrangement of the guiding plate 109 makes the water flow into the drain port 104 take less time.

[0059] Please refer to Figure 5 The back plate 103 is also provided with a door lock 112. The door lock 112 is arranged on the back plate 103, so as to facilitate the installation of the back plate 103 on the cabinet 1 through the door lock 112, so that the back plate 103 will not fall off the cabinet 1.

[0060] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the contents of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A liquid-cooled energy storage system, characterized by, The application relates to a cabinet body (1) with a top plate and a bottom plate oppositely arranged in a first direction, and a back plate (103) connecting the top plate and the bottom plate, wherein the inside of the cabinet body (1) is provided with a first water receiving plate (101) and a second water receiving plate (102) distributed in the first direction, and the first water receiving plate (101) is located on the side of the second water receiving plate (102) away from the bottom plate, wherein a drain port (104) is arranged on each of the first water receiving plate (101) and the second water receiving plate (102), and a pipeline is connected to the drain port (104); a back plate air outlet (105) is arranged on the back plate (103); a battery compartment is arranged on the side of the first water receiving plate (101) away from the second water receiving plate (102); a liquid cooling machine (2) is arranged between the first water receiving plate (101) and the second water receiving plate (102), and the liquid cooling machine (2) has an air inlet (201) and an air outlet (202), and the air outlet (202) is oppositely arranged with the back plate air outlet (105); and an air duct body (3) is in communication with the air outlet (202) and the back plate air outlet (105), and is in sealing fit with the air outlet (202) and the back plate air outlet (105). A plurality of back plate drain ports (110) are arranged on the back plate (103) and are spaced apart, and each of the back plate drain ports (110) is located on the side of the back plate air outlet (105) facing the bottom plate; and a water guide groove (111) is arranged on the inner side of the back plate (103), and the water guide groove (111) is opposite to each of the back plate drain ports (110). The water guide groove (111) comprises a connecting portion (113) arranged in parallel with the back plate (103) and connected to the back plate (103), a water guide portion (114) arranged on one side of the connecting portion (113) and perpendicular to the connecting portion (113), and a water blocking portion (115) arranged on one side of the water guide portion (114) and perpendicular to the water guide portion (114). The air duct body (3) comprises an air duct frame (301) with a through channel, wherein the first end of the channel is connected to the air outlet (202), and the second end of the channel is connected to the back plate air outlet (105); two limiting portions (302) are arranged at the two ports of the air duct frame (301); the side of the air duct frame (301) facing the bottom plate is arranged in an inclined manner, and the distance between the first end and the bottom plate in the first direction is greater than the distance between the second end and the bottom plate in the first direction; one of the limiting portions (302) is in sealing fit with the air outlet (202), and the other limiting portion (302) is in sealing fit with the back plate (103); a first sealing strip (4) is arranged between one of the limiting portions (302) and the air outlet (202); and a second sealing strip (5) is arranged between the other limiting portion (302) and the back plate (103). ​ 2. The liquid-cooled energy storage system of claim 1, wherein, ​ ​ ​ 3. The liquid-cooled energy storage system of claim 2, wherein, ​ ​ ​ ​ ​ 4. The liquid-cooled energy storage system of claim 1, wherein, ​ ​ ​ ​ ​ 5. The liquid-cooled energy storage system of claim 4, wherein, ​ A second sealing strip (5) is arranged between the limiting part (302) and the back plate (103).

6. The liquid-cooled energy storage system of claim 1, wherein, The drain port (104) comprises: A water receiving groove (107) is arranged on the first water receiving plate (101) and the second water receiving plate (102); A drain connector (108) is connected to one side of the water receiving groove (107) towards the bottom plate and connected to a pipeline at the other end.

7. The liquid-cooled energy storage system of claim 6, wherein, The length of the drain connector (108) extending out of the water receiving groove (107) is 2mm-5mm.

8. The liquid-cooled energy storage system of claim 1, wherein, A guide plate (109) is arranged on the side of the second water receiving plate (102) towards the first water receiving plate (101), and an area is formed between the guide plate (109) and the end edge of the second water receiving plate (102) close to the air outlet (202), and the drain port (104) on the second water receiving plate (102) close to the air outlet (202) is located in the area.

9. The liquid-cooled energy storage system of claim 8, wherein, Four drain ports (104) are arranged on the first water receiving plate (101); three drain ports (104) are arranged on the second water receiving plate (102). Among them, two drain ports (104) on the second water receiving plate (102) are located in the area, and the other drain port (104) is located away from the end of the air outlet (202).

10. The liquid-cooled energy storage system of claim 1, wherein, A door lock (112) is further arranged on the back plate (103).

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