Prefabricated cabin and battery energy storage system

Abstract

The utility model relates to a prefabricated cabin and a battery energy storage system, the prefabricated cabin comprises a box body, an energy storage chamber and at least two cooling chambers, the energy storage chamber is arranged in the box body, the energy storage chamber is used for accommodating at least two battery clusters, the at least two cooling chambers are arranged in the box body, each cooling chamber is used for accommodating a liquid cooling unit, and the liquid cooling unit is arranged in the box body. The energy storage chamber is located between the two cooling chambers, the energy storage chamber is arranged between the two cooling chambers, and the number of battery clusters served by each cooling unit is reduced, so that each liquid cooling unit can more effectively cool the nearby battery clusters, the distance between the cooling unit and the battery clusters is shortened, and the cooling efficiency is improved. And the pressure loss of the refrigerant fluid in the circulation process is reduced, and the inter-cluster pressure difference is reduced, so that the cooling efficiency is improved, the inter-cluster temperature difference is reduced, the consistency of the battery module and the battery clusters is improved, and the cycle life of the battery energy storage system is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery energy storage technology, and in particular to a prefabricated cabin and a battery energy storage system. Background Art

[0002] Battery energy storage systems typically utilize standard prefabricated 20-foot high cabinets. The hierarchical structure of a battery energy storage system includes battery cells, battery modules, battery clusters, and the entire battery energy storage system. The thermal management system is typically implemented at the battery module level. The liquid cooling unit uses a circulating water pump to pump coolant into the liquid cooling pipes. After passing through the liquid cooling baseplate flow channel of the battery module, the coolant returns to the liquid cooling unit through the return line. The coolant then passes through a compressor to remove some heat and cool the fluid before recirculating. However, due to flow resistance in the liquid cooling pipes and the battery module baseplate flow channel, the refrigerant pressure gradually decreases during circulation. This results in lower refrigerant pressure in battery clusters farther from the liquid cooling unit, resulting in a significant inter-cluster pressure differential. This pressure drop reduces heat exchange efficiency in battery clusters with lower refrigerant pressure, while battery clusters closer to the liquid cooling unit enjoy better cooling. This creates inter-cluster temperature differences, impacting the consistency of the battery modules and clusters, ultimately shortening the cycle life of the battery energy storage system. Utility Model Content

[0003] The embodiments of the present application provide a prefabricated cabin and a battery energy storage system to improve cooling efficiency, reduce temperature differences between clusters, and improve the consistency of battery modules and battery clusters, thereby increasing the cycle life of the battery energy storage system, thereby at least partially solving the above-mentioned technical problems.

[0004] In order to achieve the above-mentioned object, according to a first aspect of the present application, a prefabricated cabin is provided for a battery energy storage system, wherein the prefabricated cabin comprises:

[0005] Box;

[0006] an energy storage chamber, provided in the box body, for accommodating at least two battery clusters; and

[0007] At least two cooling chambers are provided in the box body, each cooling chamber is used to accommodate a liquid cooling unit, and the energy storage chamber is located between the two cooling chambers.

[0008] Optionally, the energy storage chamber and the two cooling chambers are distributed along the first direction;

[0009] At least two electrical chambers are also provided in the box, and the electrical chambers are used to accommodate electrical components;

[0010] Wherein, in the first direction, the energy storage chamber is located between the two electrical chambers, and the two electrical chambers are respectively distributed with the two cooling chambers in the second direction, and the first direction and the second direction intersect.

[0011] Optionally, the two electrical chambers are both located at one end in the second direction, and the two cooling chambers are both located at the other end in the second direction.

[0012] Optionally, the box includes:

[0013] The box body is provided with a battery mounting slot, two liquid cooling mounting slots, and two electrical mounting slots, wherein the notches of the battery mounting slot and the two liquid cooling mounting slots are all oriented in the second direction, and the notches of the two electrical mounting slots are all oriented in the first direction;

[0014] An energy storage chamber door, covering the notch of the battery installation slot to define the energy storage chamber;

[0015] Two cooling chamber doors, respectively covering the notches of the two liquid cooling installation slots to define the two cooling chambers; and

[0016] The two electrical room doors are respectively covered on the notches of the two electrical installation slots to respectively define the two electrical rooms.

[0017] Optionally, the box body includes a first column structure, the first column structure extends along a third direction, and the third direction intersects with the first direction and the second direction respectively;

[0018] The first column structure is located between the battery installation slot and at least one of the liquid cooling installation slots, and the cooling chamber door and the energy storage chamber door are both installed on the first column structure through a hinge structure.

[0019] Optionally, the box body further includes a second column structure, and the second column structure extends along a third direction;

[0020] The second column structure is provided on the battery mounting slot to divide the battery mounting slot into at least two sub-mounting slots in a first direction, and the two sub-mounting slots are respectively used to accommodate two battery clusters;

[0021] At least two energy storage chamber doors are provided, and the two energy storage chamber doors are respectively covered on the notches of the two sub-mounting slots.

[0022] Optionally, the cross-sectional dimension of the second pillar structure is smaller than the cross-sectional dimension of the first pillar structure.

[0023] Optionally, a ventilation hole is provided on the cooling chamber door.

[0024] Optionally, the box body is further provided with an opening facing the first direction, the opening being communicated with the liquid cooling installation slot, and the box body further comprises a mesh plate, the mesh plate sealing the opening.

[0025] According to a second aspect of the present application, a battery energy storage system is provided, comprising:

[0026] A prefabricated cabin as described in any one of the above;

[0027] at least two battery clusters housed in the energy storage chamber; and

[0028] At least two liquid cooling units are provided, each of the liquid cooling units being housed in one of the cooling chambers.

[0029] In the prefabricated cabin of the embodiment of the present application, by placing the energy storage chamber between the two cooling chambers, the number of battery clusters served by each cooling unit is reduced, so that each liquid cooling unit can cool the nearby battery clusters more effectively, and the distance between the cooling unit and the battery cluster is shortened, which reduces the pressure loss of the refrigerant during the circulation process and reduces the pressure difference between clusters, thereby improving the cooling efficiency, reducing the temperature difference between clusters, and improving the consistency of battery modules and battery clusters, thereby improving the cycle life of the battery energy storage system.

[0030] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0032] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0033] Figure 1 is a structural perspective view of a prefabricated cabin provided in an exemplary embodiment of the present disclosure;

[0034] Figure 2 yes Figure 1 The main structural view of the prefabricated cabin;

[0035] Figure 3 yes Figure 1 The structural left view of the prefabricated cabin;

[0036] Figure 4 yes Figure 1 The right side view of the prefabricated cabin structure.

[0037] Description of reference numerals:

[0038] 100, prefabricated cabin; 10, box body; 20, energy storage room; 30, electrical room; 1, box body; 11, first column structure; 12, second column structure; 13, mesh plate; 2, battery mounting groove; 21, sub-mounting groove; 3, electrical mounting groove; 4, cooling room door; 6, hinge structure. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor are within the protection scope of the present application.

[0040] The present application provides a prefabricated cabin, please refer to Figure 1 and Figure 2 , Figures 1 to 4 The prefabricated cabin provided in the embodiments of the present application is shown in the structural diagram.

[0041] The prefabricated cabin 100 includes a box body 10, which is the basic shell structure of the prefabricated cabin 100, used to protect the internal components from the external environment, and the box body 10 is usually made of corrosion-resistant, fireproof and heat-insulating materials to ensure the safe and stable operation of the internal equipment.

[0042] The prefabricated cabin 100 also includes an energy storage room 20, which is arranged in the box body 10 and is used to accommodate at least two battery clusters. The design of the energy storage room 20 aims to ensure the effective layout and space utilization of the battery clusters so as to integrate more energy in a limited space.

[0043] The prefabricated cabin 100 also includes a cooling room (not shown in the figure, please refer to the position of the cooling room door 4 in the figure), at least two cooling rooms are arranged in the box body 10, and each cooling room is used to accommodate one liquid cooling unit. This design makes the liquid cooling unit more effectively serve the nearby battery cluster, improves the cooling efficiency, and the energy storage room 20 is located between the two cooling rooms, which can ensure that each liquid cooling unit can more closely cool the nearby battery cluster, reduce the pressure loss of the refrigerant in the circulation process, and reduce the inter-cluster pressure difference.

[0044] In the technical solutions of the present application, by arranging the energy storage room 20 between the two cooling rooms, the number of battery clusters served by each cooling unit is reduced, so that each liquid cooling unit can more effectively cool the nearby battery cluster, and the distance between the cooling unit and the battery cluster is shortened, which reduces the pressure loss of the refrigerant in the circulation process and reduces the inter-cluster pressure difference, thereby improving the cooling efficiency, reducing the inter-cluster temperature difference, improving the consistency of the battery module and the battery cluster, and prolonging the cycle life of the battery energy storage system.

[0045] It is understandable that the number of battery clusters served by each cooling unit is reduced, and the distance between the cooling unit and the battery cluster is shortened. The load on the liquid cooling unit is significantly reduced, and the refrigeration power requirement for the liquid cooling unit is also significantly reduced accordingly. This means that the power of the compressor and circulating water pump can be reduced accordingly. With the reduced power requirement, the design of the liquid cooling unit can be more compact, thereby significantly reducing its volume and footprint. Even if the number of cooling units is increased, the overall volume and overall footprint of the cooling unit can still be reduced. This can improve the space utilization of the prefabricated cabin 100 to a certain extent, integrate more energy within the relatively limited space of the prefabricated cabin 100, and improve the volumetric energy density of the battery energy storage system. It is also understandable that the energy storage chamber 20 is located between the two cooling chambers, which can also make the overall structure of the prefabricated cabin 100 present a symmetrical layout. After the battery energy storage system is integrated, the center of mass is reasonably distributed, which is conducive to the overall transportation, overhead lifting, and stacking of the battery energy storage system.

[0046] In some embodiments, see Figure 2 , the energy storage chamber 20 and the two cooling chambers (not shown in the figure, refer to the location of the cooling chamber door 4 for understanding) are distributed along the first direction; please combine Figure 1 、 Figure 3 and Figure 4 At least two electrical rooms 30 are also provided in the box body 10, and the electrical rooms 30 are used to accommodate electrical components; wherein, in the first direction, the energy storage chamber 20 is located between the two electrical rooms 30, and the two electrical rooms 30 are respectively distributed in the second direction with two cooling rooms (not shown in the figure, refer to the position of the mesh plate 13 for understanding), and the first direction and the second direction intersect. In these embodiments, the electrical rooms 30 are used to accommodate electrical components, such as a power conversion system (PCS), a control system, etc. Each electrical room 30 serves a nearby battery cluster and a cooling unit, reducing the distance of signal transmission and power transmission, reducing resistance energy loss, and improving energy efficiency. In addition, it can be understood that after the volume and floor space of the cooling room are reduced, distributing the electrical room 30 and the cooling room in the second direction can avoid the waste of space in the second direction of the prefabricated cabin 100 due to size limitations, improve the space utilization of the prefabricated cabin 100, and thus improve the energy density and energy efficiency of the battery energy storage system.

[0047] It should be noted that the intersection of the first direction and the second direction refers to the intersection or perpendicular relationship of these two direction lines in three-dimensional space. Specifically, the "intersection" here means that the first direction and the second direction form a right-angle intersection, that is, they are perpendicular to each other. This layout design helps to optimize space utilization and the connection between components. For example, the first direction is used to describe the distribution of the internal components of the prefabricated cabin 100 in the length direction of the box 10, and the second direction is used to describe the distribution of the internal components of the prefabricated cabin 100 in the width direction of the box 10. Similarly, the third direction mentioned below intersects with the first direction and the second direction respectively, that is, the third direction is used to describe the distribution of the internal components of the prefabricated cabin 100 in the height direction of the box 10, which will not be repeated here.

[0048] It can be understood that the two electrical rooms 30 and the two cooling rooms are respectively distributed in the second direction, including two layout forms. One layout form is that one electrical room 30 is located at one end in the second direction, and a cooling room adjacent to it is located at the other end in the second direction; another cooling room is located at one end in the second direction, and another electrical room 30 adjacent to it is located at the other end in the second direction; there is also a local form that both electrical rooms 30 are located at one end in the second direction, and both cooling rooms are located at the other end in the second direction.

[0049] In some embodiments, see Figure 3 and Figure 4 , the two electrical chambers 30 are both located at one end in the second direction, and the two cooling chambers (not shown in the figure, refer to the position of the mesh plate 13 for understanding) are both located at the other end in the second direction ( Figure 3 and Figure 4 They are the left view and the right view respectively, that is, Figure 3 The left end and Figure 4 The right end in the second direction is the same end, and Figure 3 The right end and Figure 4 The left end in the figure is the same end in the second direction. In these embodiments, in the second direction, the two electrical chambers 30 are located at the same end, and the two liquid cooling chambers are located at the other end. That is, in the first direction, the two electrical chambers 30 are arranged opposite each other, and the two cooling chambers are arranged opposite each other, rather than presenting a layout in which one cooling chamber is opposite to another electrical chamber 30 and diagonally opposite to another cooling chamber. This avoids mutual interference and confusion, facilitates centralized inspection and maintenance by maintenance personnel, reduces maintenance time and complexity, and can also reduce the cooling flow path length of the cooling unit. It can also reduce the connection length of the electrical components, thereby reducing resistance energy loss, optimizing thermal management, improving energy efficiency, and enhancing maintenance convenience.

[0050] In some embodiments, see Figure 1The box body 10 includes a box body 1, an energy storage chamber door (not shown in the figure), two cooling chamber doors 4, and two electrical chamber doors (not shown in the figure). The box body 1 is provided with a battery mounting slot 2, two liquid cooling mounting slots (not shown in the figure, refer to the position of the cooling chamber door 4 for understanding), and two electrical mounting slots 3. The notches of the battery mounting slot 2 and the two liquid cooling mounting slots are both facing the second direction, and the notches of the two electrical mounting slots 3 are both facing the first direction; the energy storage chamber door cover is provided on the notch of the battery mounting slot 2 to define the energy storage chamber 20; the two cooling chamber doors 4 are respectively provided on the notches of the two liquid cooling mounting slots to respectively define two cooling chambers; the two electrical chamber doors are respectively provided on the notches of the two electrical mounting slots 3 to respectively define two electrical chambers 30. In these embodiments, by providing a battery installation slot 2, two liquid cooling installation slots, and two electrical installation slots 3, the battery cluster, cooling unit, and electrical components can be installed in a predetermined position and manner, which is convenient for production and assembly. The energy storage chamber door (not shown in the figure), two cooling chamber doors 4, and two electrical chamber doors (not shown in the figure) can be provided to seal the energy storage chamber 20, the two cooling chambers, and the two electrical chambers 30 to prevent external factors such as dust and moisture from entering, thereby protecting the internal components and playing a certain safety protection role, preventing unauthorized personnel from arbitrarily operating the internal components and reducing safety hazards. Maintenance personnel can inspect and maintain the internal components by opening the corresponding doors without having to open the entire box 10, making maintenance work more convenient.

[0051] In some embodiments, see Figure 2 The box body 1 includes a first column structure 11, which extends along a third direction, and the third direction intersects with the first direction and the second direction respectively; the first column structure 11 is located between the battery mounting slot 2 and at least one liquid cooling mounting slot (not shown in the figure, refer to the position of the cooling chamber door 4 for understanding), and the cooling chamber door 4 and the energy storage chamber door are both mounted on the first column structure 11 via a hinge structure 6. In these embodiments, the energy storage chamber door is mounted on the first column structure 11 via the hinge structure 6, and the cooling chamber door 4 is mounted on the first column structure 11 via the hinge structure 6. The first column structure 11 between the battery mounting slot 2 and the at least one liquid cooling mounting slot can be shared, which can not only install the cooling chamber door 4 and the energy storage chamber door, but also enhance the overall structural stability of the box body 10 and improve the overall structural strength of the prefabricated cabin 100.

[0052] In some embodiments, see Figure 2The box body 1 further includes a second column structure 12 extending along a third direction. The second column structure 12 is provided in the battery mounting slot 2 to divide the battery mounting slot 2 into at least two sub-mounting slots 21 in the first direction. The two sub-mounting slots 21 are respectively used to accommodate two battery clusters. At least two energy storage chamber doors are provided, and the two energy storage chamber doors are respectively provided to cover the notches of the two sub-mounting slots 21. In these embodiments, at least two energy storage chamber doors are provided, so that each battery cluster corresponds to an energy storage chamber door. Maintenance personnel can more conveniently access the battery clusters in each sub-mounting slot 21 for inspection and maintenance, reducing maintenance time and complexity. The second column structure 12 not only serves to divide the space, but also enhances the overall structural stability of the box body 10 and improves the overall structural strength of the prefabricated cabin 100.

[0053] It can be understood that each battery cluster corresponds to a storage chamber door, which is installed on the first column structure 11 through a hinge structure 6. When there are two battery clusters, there are two corresponding energy storage chamber doors. There are two first column structures 11. Each first column structure 11 is installed with a cooling chamber door 4 and an adjacent energy storage chamber door. There is one second column structure 12, which is located between the two first column structures 11 to divide two sub-mounting slots 21 to meet the setting requirements of the two battery clusters. When the number of battery clusters increases, the number of energy storage chamber doors also increases, and the number of first column structures 11 needs to be increased. For example, there are four battery clusters, and four energy storage chamber doors are correspondingly provided. There are three first column structures 11, among which the centrally arranged first column structure 11 is installed with two energy storage chamber doors, and each of the other two first column structures 11 is installed with a cooling chamber door 4 and an adjacent energy storage chamber door. It can be understood that the centrally arranged first column structure 11 can also play the role of dividing the area. Therefore, a second column structure 12 can be provided on both sides of the central first column structure 11 to divide four sub-mounting slots 21 to meet the setting requirements of four battery clusters. In a specific embodiment, as Figure 2As shown, there are six battery clusters, six energy storage chamber doors are correspondingly provided, three second column structures 12 are provided, and four first column structures 11 are provided. Among them, each of the two first column structures 11 on both sides is installed with a cooling chamber door 4 and an adjacent energy storage chamber door, and the two central first column structures 11 and the three second column structures 12 divide the battery mounting slot 2 into six sub-mounting slots 21 to meet the setting requirements of six battery clusters. It can also be understood that the first column structure 11 and the second column structure 12 arranged near the notch of the battery mounting slot 2 and distributed roughly along the first direction form a column structure group arranged in a row, and multiple column structure groups can also be arranged in multiples along the second direction, that is, the first column structure 11 and the second column structure 12 are both provided with multiples, multiple first column structures 11 are distributed along the second direction, and multiple second column structures 12 are distributed along the second direction, that is, in the first direction and the second direction, multiple first column structures 11 and multiple second column structures 12 form a matrix distribution, further enhancing the overall structural stability of the box body 10 and improving the overall structural strength of the prefabricated cabin 100.

[0054] In some embodiments, see Figure 2 , the cross-sectional dimensions of the second column structure 12 are smaller than those of the first column structure 11. In these embodiments, the larger cross-sectional dimensions of the first column structure 11 facilitate structural strength, while the smaller cross-sectional dimensions of the second column structure 12 facilitate saving storage space in the energy storage chamber 20. This ensures a certain amount of storage space in the energy storage chamber 20 while also significantly enhancing the overall mechanical strength of the prefabricated cabin 100. Specifically, both the first column structure 11 and the second column structure 12 are square, and the dimension of the second column structure 12 in the first direction is smaller than the dimension of the first column structure 11 in the first direction.

[0055] In some embodiments, the cooling chamber door 4 is provided with ventilation holes (not shown). In these embodiments, the ventilation holes facilitate air circulation, helping the liquid cooling unit dissipate heat, ensuring the normal operation of the liquid cooling system, and ensuring the high performance and reliability of the system. Specifically, the cooling chamber door 4 can be made of a mesh plate, or holes can be opened in an entire door panel to form the cooling chamber door 4 with ventilation holes.

[0056] In some embodiments, see Figure 1 、 Figure 3 and Figure 4The housing 10 further includes an opening facing in the first direction, the opening communicating with the liquid cooling installation slot. The housing 10 further includes a mesh plate 13 that seals the opening. In these embodiments, the mesh plate 13 has numerous small holes that allow air to pass through while blocking larger particulate matter, such as dust and insects. Installing the mesh plate 13 ensures adequate intake and exhaust airflow while preventing external impurities from entering the liquid cooling unit, thereby ensuring efficient operation of the liquid cooling unit within the prefabricated cabin 100, improving its protection level, and extending its service life.

[0057] According to a second aspect of the present application, a battery energy storage system is provided, comprising a prefabricated cabin 100, at least two battery clusters, and at least two liquid cooling units. The at least two battery clusters are housed in an energy storage chamber 20, and each liquid cooling unit is housed in a cooling chamber. The structure of the prefabricated cabin 100 is as described above. Since the battery energy storage system adopts all the technical solutions of all the above-mentioned embodiments, it has at least the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here.

[0058] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0059] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0060] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0061] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A prefabricated cabin for a battery energy storage system, characterized in that: include: Box; An energy storage chamber is provided in the box body, and the energy storage chamber is used to accommodate at least two battery clusters; as well as, At least two cooling chambers are provided in the box body, each cooling chamber is used to accommodate a liquid cooling unit, and the energy storage chamber is located between the two cooling chambers.

2. The prefabricated cabin according to claim 1, characterized in that: The energy storage chamber and the two cooling chambers are distributed along a first direction; At least two electrical chambers are also provided in the box, and the electrical chambers are used to accommodate electrical components; Wherein, in the first direction, the energy storage chamber is located between the two electrical chambers, and the two electrical chambers are respectively distributed with the two cooling chambers in the second direction, and the first direction and the second direction intersect.

3. The prefabricated cabin according to claim 2, characterized in that: The two electrical chambers are both located at one end in the second direction, and the two cooling chambers are both located at the other end in the second direction.

4. The prefabricated cabin according to claim 3, characterized in that: The box includes: The box body is provided with a battery mounting slot, two liquid cooling mounting slots, and two electrical mounting slots, wherein the notches of the battery mounting slot and the two liquid cooling mounting slots are all oriented in the second direction, and the notches of the two electrical mounting slots are all oriented in the first direction; An energy storage chamber door, covering the notch of the battery installation slot to define the energy storage chamber; Two cooling chamber doors, respectively covering the notches of the two liquid cooling installation slots to define the two cooling chambers; and The two electrical room doors are respectively covered on the notches of the two electrical installation slots to respectively define the two electrical rooms.

5. The prefabricated cabin according to claim 4, characterized in that: The box body includes a first column structure, the first column structure extends along a third direction, and the third direction intersects with the first direction and the second direction respectively; The first column structure is located between the battery installation slot and at least one of the liquid cooling installation slots, and the cooling chamber door and the energy storage chamber door are both installed on the first column structure through a hinge structure.

6. The prefabricated cabin according to claim 5, characterized in that: The box body further includes a second column structure, wherein the second column structure extends along a third direction; The second column structure is provided on the battery mounting slot to divide the battery mounting slot into at least two sub-mounting slots in a first direction, and the two sub-mounting slots are respectively used to accommodate two battery clusters; At least two energy storage chamber doors are provided, and the two energy storage chamber doors are respectively covered on the notches of the two sub-mounting slots.

7. The prefabricated cabin according to claim 6, characterized in that: The cross-sectional dimension of the second pillar structure is smaller than the cross-sectional dimension of the first pillar structure.

8. The prefabricated cabin according to any one of claims 4 to 7, characterized in that: The cooling chamber door is provided with ventilation holes.

9. The prefabricated cabin according to any one of claims 4 to 7, characterized in that: The box body is further provided with an opening facing the first direction, the opening being communicated with the liquid cooling installation slot, and the box body further comprises a mesh plate, the mesh plate sealing the opening.

10. A battery energy storage system, characterized in that: The battery energy storage system comprises: The prefabricated cabin according to any one of claims 1 to 9; at least two battery clusters housed in the energy storage chamber; and At least two liquid cooling units are provided, each of the liquid cooling units being housed in one of the cooling chambers.

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