Energy storage cabinet and energy storage system

Abstract

The application relates to the technical field of energy storage, in particular to an energy storage cabinet and an energy storage system comprising the same, which comprises a cabinet body, a door body rotatably connected to the cabinet body, and a battery cluster arranged in the cabinet body and stacked along a height direction, further comprising: an air inlet duct arranged on the inner side of the door body and used for air flow conduction with an air outlet of an air conditioner on the outer side of the door body, a flow guide duct configured at the bottom of the battery cluster and used for communication with the air inlet duct, and a backflow air duct formed between the battery cluster and a back plate of the cabinet body and communicated with the end of the flow guide duct; and a backflow port communicated with the backflow air duct is formed at the top of the cabinet body. Since one end of the air inlet duct connected with the air conditioner and the other end connected with the flow guide duct are distributed in a staggered manner along the horizontal direction, the non-orthogonal installation of the external air conditioner and the battery cluster can be effectively adapted, the structure is simple, and the overall heat dissipation requirement of the energy storage cabinet can be met.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to an energy storage cabinet, and further to an energy storage system including the energy storage cabinet. Background Technology

[0002] An energy storage cabinet is an integrated electrical energy storage device. Its core function is to store electrical energy and release it when needed. Its main components include battery modules, battery management system, converter and thermal management system. Energy storage cabinets can be used not only on the grid side to achieve peak and frequency regulation, but also in industrial and commercial applications to achieve peak shaving and valley filling or as a backup power source. With the popularization of new energy sources and the widespread application of industrial and commercial energy storage, the application scenarios of energy storage cabinets have become more diversified.

[0003] Energy storage cabinets typically require internal air ducts to assist in battery heat dissipation. These air ducts are a crucial component of the energy storage cabinet's thermal management, used to circulate cool air or hot air after heat exchange along a pre-defined path to effectively cool the internal battery pack, thereby maintaining the battery temperature within a reasonable range. Due to the need for daily maintenance and door opening / closing of the energy storage cabinet, external air conditioners sometimes cannot be installed directly opposite the internal battery clusters. Limited by the installation location of the external air conditioner and the layout of the internal components of the energy storage cabinet, improvements to the internal structure of the energy storage cabinet are also necessary to achieve effective heat dissipation of the internal battery clusters and meet the heat dissipation requirements of the energy storage cabinet. Utility Model Content

[0004] The purpose of this utility model is to provide an energy storage cabinet and energy storage system that can effectively dissipate heat from the internal battery clusters. While having a simple structure, it can also meet the overall heat dissipation requirements of the energy storage cabinet.

[0005] To achieve one of the aforementioned objectives, according to one aspect of this application, an energy storage cabinet is provided, comprising: a cabinet body, a door rotatably connected to the cabinet body, and battery clusters disposed inside the cabinet body and stacked along the height direction, further comprising: An air inlet duct is located inside the door and is used to connect with the air outlet of the air conditioner on the outside of the door. A guide air duct, constructed at the bottom of the battery cluster and used to communicate with the air inlet duct; and A return air duct is formed between the battery cluster and the back panel of the cabinet and is connected to the end of the air guide duct; a return port is formed on the top of the cabinet, which is connected to the return air duct and is connected to the return air vent of the air conditioner on the outside of the door; the end of the air inlet duct connected to the air conditioner and the end connected to the air guide duct are configured to be staggered in the horizontal direction.

[0006] It can be seen that by setting up an air inlet duct to facilitate communication with the air outlet of the air conditioner on the outside of the door, the cold air generated by the air conditioner is guided into the cabinet. The air guide duct can then guide the cold air to the bottom of the battery cluster, and then guide it to the top of the battery cluster through the return air duct between the battery cluster and the back panel of the cabinet. Finally, it returns to the air conditioner's return air vent through the return port, thereby achieving effective cooling of the internal battery cluster. Since the end of the air inlet duct connected to the air conditioner and the end connected to the air guide duct are horizontally staggered, it can effectively adapt to the non-directly installed external air conditioner and battery cluster. The structure is simple and can meet the overall heat dissipation requirements of the energy storage cabinet.

[0007] In addition to one or more of the above, or as an alternative, in another embodiment, the air inlet duct includes a main body and a connecting part with a connecting port on one side, and the two are configured to be connected to the air outlet of the air conditioner outside the door and the air guide duct, respectively.

[0008] In addition to one or more of the above, or as an alternative, in another embodiment, the air inlet duct further includes a bend, the main body being connected to the connecting portion via the bend, and the main body and the connecting portion being configured such that at least a portion of them are not opposite each other along the height direction of the cabinet.

[0009] In addition to one or more of the above, or as an alternative, in another embodiment, the air guide duct is configured to be hollow inside and have a first opening at one end near the air inlet duct, and the top of the end of the air guide duct opposite to the first opening has a second opening communicating with the return air duct.

[0010] In addition to one or more of the above, or as an alternative, in another embodiment, the bottom plate of the air guide duct is provided with a folded edge that bends toward the second opening and is used to guide the airflow upward.

[0011] In addition to one or more of the above, or as an alternative, in another embodiment, the energy storage cabinet further includes a sealing ring, which is disposed at the connection between the air inlet duct and the air guide duct and is in a compressed state.

[0012] In addition to one or more of the above, or as an alternative, in another embodiment, one of the air inlet duct and the air guide duct is provided with a flange, and the other is fixed with the sealing ring. The sealing ring pressed against the flange is used to achieve a fluid-proof seal at the connection between the air inlet duct and the air guide duct when the door is closed.

[0013] In addition to one or more of the above, or as an alternative, in another embodiment, the energy storage cabinet further includes an isolation member installed at the bottom of the airflow duct and configured to divide the cabinet into a battery compartment and an electrical compartment along the height direction.

[0014] In addition to one or more of the above, or as an alternative, in another embodiment, the isolation member is configured to be fixed to a partition plate at the bottom of the air duct, and the partition plate extends from the bottom front end of the air duct to the back panel of the cabinet, with thermal insulation cotton filling the gap between the partition plate and the back panel of the cabinet.

[0015] In addition to one or more of the above, or as an alternative, in another embodiment, a flow-guiding gap for cold air to flow is formed between the bottom of the battery cluster and the air-guiding duct, and / or Both the air inlet duct and the air guide duct are internally fixed with thermal insulation layers, and / or The top of the cabinet is also provided with a baffle, and the baffle and the battery cluster form a return air inlet that is connected to the return air vent of the air conditioner on the outside of the door.

[0016] In addition to one or more of the above, or as an alternative, in another embodiment, a limiting roller is provided on the bottom inner side of the door body, the limiting roller being configured to abut against the cabinet body when the door body is subjected to force to reduce the settlement of the door body.

[0017] In addition to one or more of the above, or as an alternative, in another embodiment, the battery cluster includes: racks evenly spaced along the height direction inside the cabinet, and a plurality of battery boxes placed one-to-one in each of the racks, with a gap between adjacent battery boxes for airflow.

[0018] To achieve one of the aforementioned objectives, according to another aspect of this application, an energy storage system is provided, the energy storage system comprising the energy storage cabinet described in the foregoing aspect.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting up an air inlet duct, it is easy to connect with the air outlet of the air conditioner on the outside of the door, thereby guiding the cold air generated by the air conditioner into the cabinet. The guide duct can guide the cold air to the bottom of the battery cluster, and then guide it to the top of the battery cluster through the return air duct between the battery cluster and the back panel of the cabinet. Finally, it returns to the air conditioner's return air vent through the return port, thereby achieving effective cooling of the internal battery cluster. Since the end of the air inlet duct connected to the air conditioner and the end connected to the guide duct are staggered in the horizontal direction, it can effectively adapt to the non-directly installed external air conditioner and battery cluster. While the structure is simple, it can meet the overall heat dissipation requirements of the energy storage cabinet. Attached Figure Description

[0020] The disclosure of this application will be more readily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0021] In the picture: Figure 1 A three-dimensional structural diagram of an energy storage cabinet provided by this utility model; Figure 2 A three-dimensional structural diagram of an energy storage cabinet when the door is opened, as provided in this utility model; Figure 3 A three-dimensional structural diagram of the air inlet duct of an energy storage cabinet provided by this utility model; Figure 4 A three-dimensional structural diagram of the air duct guiding the energy storage cabinet provided by this utility model; Figure 5 A three-dimensional structural diagram of an energy storage cabinet when its air inlet duct and air guide duct are connected; Figure 6 A structural cross-sectional view of an energy storage cabinet with its door open, provided by this utility model; Figure 7 for Figure 6 Enlarged view of a section at point B in the middle; Figure 8 for Figure 6 Enlarged view of a section at point C; Figure 9 for Figure 2 Enlarged view of a portion of point A in the middle; In the attached diagram: 1 Cabinet, 2 Door, 3 Battery Cluster, 31 Hanger, 32 Battery Box, 4 Air Inlet Duct, 41 Main Body, 42 Connecting Part, 43 Bending Part, 44 Flanged Edge, 5 Guide Duct, 51 First Opening, 52 Second Opening, 53 Flanged Edge, 6 Return Air Duct, 7 Sealing Ring, 8 Isolation Component, 9 Battery Compartment, 10 Electrical Compartment, 11 Insulation Cotton, 12 Insulation Layer, 13 Baffle, 14 Limiting Roller. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0023] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0024] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0025] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0026] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0027] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0028] In existing solutions, energy storage cabinets typically require internal air ducts to effectively dissipate heat from the battery clusters, and external air conditioners are positioned directly opposite the battery clusters to achieve effective cooling of the internal batteries. This arrangement is generally suitable for situations where internal components are arranged horizontally and clearly divided into vertical compartments. In this case, a vertical air duct structure is sufficient to effectively connect the air conditioner outlets and the internal air ducts. However, when internal components and compartments are arranged in an unconventional manner, the external air conditioner may not be positioned opposite the battery clusters. To ensure effective heat dissipation of the internal battery clusters, the air duct structure of the energy storage cabinet needs to be further improved to meet the cooling requirements of the internal battery clusters.

[0029] Figure 1 This is a three-dimensional structural diagram of an energy storage cabinet according to one embodiment of the present application. The energy storage cabinet can be used in an energy storage system and includes: a cabinet body 1, a door 2 rotatably connected to the cabinet body 1, and battery clusters 3 disposed inside the cabinet body 1 and stacked along the height direction. It also includes: an air inlet duct 4 disposed inside the door 2 and for communicating with the air outlet of an air conditioner outside the door 2; a guide duct 5 constructed at the bottom of the battery clusters 3 and for communicating with the air inlet duct 4; and a return air duct 6 formed between the battery clusters 3 and the rear panel of the cabinet body 1 and communicating with the end of the guide duct 5. A return port is formed on the top of the cabinet body 1, which communicates with the return air duct 6 and is connected to the return air outlet of the air conditioner outside the door 2. The end of the air inlet duct 4 connected to the air conditioner and the end connected to the guide duct 5 are configured to be staggered in the horizontal direction.

[0030] It is not difficult to see that, reference Figure 2 and Figure 6 By setting up an air inlet duct 4, it is easy to connect with the air outlet of the air conditioner on the outside of the door 2, thereby guiding the cold air generated by the air conditioner into the cabinet 1. The air guide duct 5 can guide the cold air to the bottom of the battery cluster 3, and then guide it to the top of the battery cluster 3 through the return air duct 6 between the battery cluster 3 and the back panel of the cabinet 1. Finally, it returns to the air conditioner's return air vent through the return port, thereby achieving effective cooling of the internal battery cluster 3. Since the end of the air inlet duct 4 connected to the air conditioner and the end connected to the air guide duct 5 are horizontally staggered, it can effectively adapt to the non-direct installation of the external air conditioner and the battery cluster 3. While the structure is simple, it can meet the overall heat dissipation requirements when the internal components of the energy storage cabinet are arranged in an unconventional manner.

[0031] It should be noted that, compared to the traditional air duct that circulates air from top to bottom, the air duct structure of this solution, which draws air in from the bottom and exits from the top, can use the return air duct to guide the cold air into the gap between adjacent batteries. This can effectively ensure that the battery box 32 can make effective contact with the cold air from both the top and bottom. Combined with the special structure of the air inlet duct 4, it can achieve effective heat dissipation of the internal batteries in non-traditional layouts.

[0032] The following will illustrate further specific implementations or refinements and improvements to the energy storage cabinet through exemplary description, in order to further improve it or for other improvement considerations.

[0033] In one embodiment, reference is made to... Figure 2 , Figure 3 and Figure 5 The air inlet duct 4 includes a main body 41 connected to the main body and a connecting part 42 with a connecting port on one side, and the two are configured to be connected to the air outlet of the air conditioner outside the door 2 and the air guide duct 5, respectively.

[0034] It can be seen that by setting the air inlet duct 4 as a connected main body 41 and connecting part 42, it is convenient to connect the two to the air outlet of the air conditioner and the air guide duct 5 respectively, so as to effectively guide the air conditioner to the bottom of the battery cluster 3.

[0035] Based on this, the air inlet duct 4 also includes a bending portion 43, and the main body 41 is connected to the connecting portion 42 through the bending portion 43. The main body 41 and the connecting portion 42 are configured such that at least a portion of them are not opposite each other along the height direction of the cabinet 1.

[0036] It is easy to see that the bending part 43 facilitates the misalignment of the main body part 41 and the connecting part 42, so that when the air conditioner and the battery cluster 3 are not installed directly opposite each other, the cold air from the air conditioner can be smoothly guided to the air duct 5 at the bottom of the battery cluster 3, thereby achieving effective cooling of the internal battery cluster 3.

[0037] In addition, the top of the main body 41 on the side away from the air duct 5 is provided with an air inlet that is connected to the outer air conditioning outlet, so as to realize the effective input of air conditioning cold air. In actual installation, it can be fixed to the inside of the door 1 with bolts.

[0038] It should be noted that both the main body 41 and the connecting part 42 can be hollow shell structures, and the bending part 43 can be a shell structure that forms a certain angle with the main body 41 and the connecting part 42, thereby forming a staggered distribution structure between the main body 41 and the connecting part 42, and thus achieving effective airflow between the staggered air conditioner and the battery cluster 3. Of course, the aforementioned bending portion 43 can also be a non-linear structure, such as an arc-shaped cylindrical structure. Its specific shape and the included angle between it and the main body portion 41 and the connecting portion 42 can be selected according to actual needs. This embodiment does not make specific limitations here.

[0039] In another embodiment, reference is made to... Figure 4 , Figure 5 , Figure 6 and Figure 7 The air guide duct 5 is configured to be hollow inside and has a first opening 51 at one end near the air inlet duct 4. The top of the end of the air guide duct 5 opposite to the first opening 51 has a second opening 52 that connects to the return air duct 6.

[0040] It is easy to see that by setting the airflow guide duct 5, the airflow transmitted from the air inlet duct 4 can be guided to the return airflow duct 6 behind the battery cluster 3. Then, the structure of the return airflow duct 6 is used to achieve effective heat dissipation of the internal battery. The first opening 51 is connected to the air inlet duct 4, and the second opening 52 guides the cold air to the return airflow duct 6.

[0041] In actual operation, this embodiment should be referred to Figure 4 and Figure 5 The first opening 51 and the connecting port on the side of the connecting part 42 are connected to each other, thereby realizing the airflow between the two.

[0042] Further reference Figure 4 and Figure 5 The bottom plate of the air guide duct 5 is provided with a folded edge 53 that bends toward the second opening 52 and is used to guide the airflow upward.

[0043] It can be seen that by utilizing the folded edge 53 at the end of the bottom plate of the air guide duct 5, it is easy to bend towards the second opening 52 to guide the cold air upward and avoid the cold air from accumulating at the corner. The structure is simple and can achieve a good airflow guiding effect.

[0044] Furthermore, refer to Figure 4 The energy storage cabinet also includes a sealing ring 7, which is located at the connection between the air inlet duct 4 and the air guide duct 5 and is in a compressed state.

[0045] It is easy to see that by using the sealing ring 7 set at the connection between the air inlet duct 4 and the air guide duct 5, an effective seal can be achieved between the air inlet duct 4 and the air guide duct 5 when the door 2 is closed, which effectively ensures the transition connection at the duct connection and avoids unnecessary heat loss.

[0046] In actual operation, this embodiment should be referred to Figure 3 , Figure 4 and Figure 5 One of the air inlet duct 4 and the air guide duct is provided with a flange 44, and the other is fixed with the sealing ring 7. The sealing ring 7 pressed against the flange 44 is used to achieve a fluid-proof seal at the connection between the air inlet duct 4 and the air guide duct when the door 2 is closed.

[0047] It can be seen that by setting a flange 44 on one of the air inlet duct 4 and the air guide duct, and setting a sealing ring 7 on the other, the flange 44 can be pressed onto the sealing ring 7, thereby achieving an effective seal at the connection between the two and reducing heat loss.

[0048] For example, a sealing ring is provided on the outer side of the first opening 51, and the connecting opening on the side of the connecting part 42 is provided with the aforementioned flange 44, thereby realizing the effective installation of the sealing ring 7. Of course, other sealing structures can also be used at the connection between the two, but this embodiment does not specifically limit them here.

[0049] In one scenario of this embodiment, reference is made. Figure 4 , Figure 6 ,and Figure 7 The energy storage cabinet also includes an isolation component 8, which is installed at the bottom of the air duct 5 and configured to divide the cabinet 1 into a battery compartment 9 and an electrical compartment 10 along the height direction.

[0050] It is easy to see that the isolation component 8 facilitates the division of the energy storage cabinet into the upper battery compartment 9 and the lower electrical compartment 10, thereby achieving effective separation of the internal space and preventing cold air from flowing to the electrical compartment 10. In addition, the effective separation between the electrical compartment 10 and the battery compartment 9 also prevents heat loss.

[0051] In actual operation, the isolation component 8 is configured and fixed to the partition plate at the bottom of the air duct 5, and the partition plate extends from the bottom front end of the air duct 5 to the back panel of the cabinet 1. The gap between the partition plate and the back panel of the cabinet 1 is filled with thermal insulation cotton 11.

[0052] It can be seen that by setting the isolation component 8 as a partition, compartmentation can be effectively achieved. Combined with the insulation cotton 11 filling the gap between the partition component 8 and the back panel of the cabinet 1, the heat leakage of the air conditioner can be effectively reduced, thereby helping to reduce the operating power of the air conditioner and improve the overall heat dissipation efficiency.

[0053] In one embodiment, reference is made to... Figure 6 and Figure 7 A guide gap for cold air to flow is formed between the bottom of the battery cluster 3 and the guide air duct 5.

[0054] It is easy to see that by forming a flow guide gap between the bottom of the battery cluster 3 and the flow guide duct 5, it is easy to guide the cold air inside the return air duct to the space between the battery cluster 3 and the flow guide duct 5, thereby ensuring effective heat dissipation at the bottom of the lowest battery.

[0055] In one embodiment, reference is made to... Figure 3 , Figure 6 and Figure 7Both the air inlet duct 4 and the air guide duct 5 are fixed with a thermal insulation layer 12.

[0056] It is easy to see that by fixing the insulation layer 12 inside both the air inlet duct 4 and the air guide duct 5, the heat loss during the cold air flow process is significantly reduced, and the overall heat dissipation efficiency of the energy storage cabinet is further improved.

[0057] In actual operation, this embodiment should be referred to Figure 6 and Figure 8 The top of the cabinet 1 is also provided with a baffle 13, and the baffle 13 and the battery cluster 3 form a return air port that is connected to the return air vent of the air conditioner outside the door 2.

[0058] It can be seen that the baffle 13 at the top of the cabinet 1 can form a return port with the battery at the top. Finally, the heated air is guided to the return air vent of the air conditioner through the return port, thus ensuring the integrity of the air duct structure.

[0059] Of course, the length of the baffle 13 can be adjusted as needed to effectively regulate the top return air volume. The specific size can be selected as needed, and this implementation does not make specific limitations here.

[0060] In one embodiment, reference is made to... Figure 2 and Figure 9 The bottom inner side of the door body 2 is also provided with a limiting roller 14, which is configured to abut against the cabinet body 1 when the door body 2 is subjected to force in order to reduce the settlement of the door body 2.

[0061] It is easy to see that by using the limiting roller 14 installed on the inside of the door 2, it is easy to abut against the inside of the cabinet 1 when the door 2 settles, thereby ensuring the posture of the door 2 and thus ensuring the effective sealing of the connection between the air inlet duct 4 and the air guide duct 5. Of course, the above-mentioned anti-settlement structure can also be a limiting block or other shapes, and this embodiment does not make specific limitations here.

[0062] In actual operation, this embodiment should be referred to Figure 6 The battery cluster 3 includes: a rack 31 evenly distributed along the height direction inside the cabinet 1, and a plurality of battery boxes 32 placed in each rack 31 in a corresponding manner, with a gap formed between two adjacent battery boxes 32 for airflow.

[0063] It can be seen that the bracket 31 facilitates the placement of the battery box 32, and the gap formed between two adjacent battery boxes 32 facilitates airflow, thereby achieving effective heat dissipation above and below the battery box 32.

[0064] This solution also proposes an energy storage system, including the energy storage cabinet described above.

[0065] In this arrangement, the cooling air in the energy storage cabinet described herein first enters the air inlet duct 4 through the air outlet of the external air conditioner, and then is guided into the guide duct 5 through the main body 41 and connecting part 42 of the air inlet duct 4. The cold air in the guide duct 5 enters the gap between adjacent battery clusters 3 through the first opening 51 and the second opening 52, and then flows upward along the surface of the battery clusters 3, carrying away heat. The heated air continues to rise along the return air duct 6, and finally is discharged through the return port at the top of the cabinet 1, returning to the return air port of the external air conditioner. Throughout the process, the sealing ring 7 ensures the airtightness between the air inlet duct 4 and the guide duct 5, and the isolation component 8 effectively separates the battery compartment 9 from the electrical compartment 10, ensuring effective cooling of the internal battery clusters 3 and facilitating adaptation to different air conditioner installation positions, thus meeting the heat dissipation requirements inside the energy storage cabinet.

[0066] The above examples primarily illustrate the energy storage cabinet and the energy storage system including the cabinet of this application. Although only some embodiments of this application have been described, those skilled in the art should understand that this application can be implemented in many other forms without departing from its spirit and scope. Therefore, the examples and embodiments shown are considered illustrative rather than restrictive, and this application may cover various modifications and substitutions without departing from the spirit and scope of the technical solution of this application.

Claims

1. An energy storage cabinet, characterized in that, include: The cabinet, a door rotatably connected to the cabinet, and battery clusters disposed inside the cabinet and stacked along the height direction, further include: An air inlet duct is located inside the door and is used to connect with the air outlet of the air conditioner on the outside of the door. A guide air duct, constructed at the bottom of the battery cluster and used to communicate with the air inlet duct; and A return air duct is formed between the battery cluster and the back panel of the cabinet and is connected to the end of the air guide duct; a return port is formed on the top of the cabinet, which is connected to the return air duct and is connected to the return air vent of the air conditioner on the outside of the door; the end of the air inlet duct connected to the air conditioner and the end connected to the air guide duct are configured to be staggered in the horizontal direction.

2. The energy storage cabinet according to claim 1, characterized in that, The air inlet duct includes a main body and a connecting part with a connecting port on one side, and the two are configured to connect to the air outlet of the air conditioner on the outside of the door and the air guide duct, respectively.

3. The energy storage cabinet according to claim 2, characterized in that, The air intake duct also includes a bend, and the main body is connected to the connecting part through the bend. The main body and the connecting part are configured such that at least a portion of them are not opposite each other along the height direction of the cabinet.

4. The energy storage cabinet according to claim 1, characterized in that, The air guide duct is configured to be hollow inside and has a first opening at one end near the air inlet duct, and a second opening at the top of the end of the air guide duct opposite to the first opening, which is connected to the return air duct.

5. The energy storage cabinet according to claim 4, characterized in that, The bottom plate of the air guide duct has a folded edge that bends toward the second opening and is used to guide the airflow upward.

6. The energy storage cabinet according to claim 1, characterized in that, The energy storage cabinet also includes a sealing ring, which is located at the connection between the air inlet duct and the air guide duct and is in a compressed state.

7. The energy storage cabinet according to claim 6, characterized in that, One of the air inlet duct and the air guide duct is provided with a flange, and the other is fixed with the sealing ring. The sealing ring pressed against the flange is used to achieve a fluid-proof seal at the connection between the air inlet duct and the air guide duct when the door is closed.

8. The energy storage cabinet according to claim 1, characterized in that, The energy storage cabinet also includes an isolation component installed at the bottom of the air duct and configured to divide the cabinet into a battery compartment and an electrical compartment along the height direction.

9. The energy storage cabinet according to claim 8, characterized in that, The isolation component is configured and fixed to the partition plate at the bottom of the air duct, and the partition plate extends from the bottom front end of the air duct to the back panel of the cabinet. The gap between the partition plate and the back panel of the cabinet is filled with thermal insulation cotton.

10. The energy storage cabinet according to claim 1, characterized in that, A flow channel is formed between the bottom of the battery cluster and the air duct to allow cold air to flow through, and / or Both the air inlet duct and the air guide duct are internally fixed with thermal insulation layers, and / or The top of the cabinet is also provided with a baffle, and the baffle and the battery cluster form a return air inlet that is connected to the return air vent of the air conditioner on the outside of the door.

11. The energy storage cabinet according to claim 1, characterized in that, The bottom inner side of the door is also provided with a limiting roller, which is configured to abut against the cabinet when the door is subjected to force to reduce the settlement of the door.

12. The energy storage cabinet according to claim 1, characterized in that, The battery cluster includes: racks evenly spaced along the height direction inside the cabinet, and multiple battery boxes placed one-to-one in each rack, with a gap between adjacent battery boxes for airflow.

13. An energy storage system, characterized in that, Includes the energy storage cabinet as described in any one of claims 1-12.

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