Energy storage system and energy storage cabinet thereof

Abstract

The present application is applicable to the technical field of energy storage devices, and provides an energy storage system (1) and an energy storage cabinet (10) thereof. The energy storage system (1) comprises an integration cabinet (20) and at least one energy storage cabinet (10), a plurality of battery boxes (100) being provided in the energy storage cabinet (10), the volume of a cabinet body being V1, and the total volume of the plurality of battery boxes (100) being V2, where 0.5≤V2 / V1. One integration cabinet (20) is arranged corresponding to the at least one energy storage cabinet (10), a second high-voltage port (21) of the integration cabinet (20) being connected to a first high-voltage port (11) of the at least one energy storage cabinet (10), a second low-voltage port (22) of the integration cabinet (20) being connected to a first low-voltage port (12) of the at least one energy storage cabinet (10), and a thermal management unit port (23) of the integration cabinet (20) being connected to a fluid pipe port (13) of the at least one energy storage cabinet (10). In the energy storage system provided in the present application, the battery boxes are placed in the energy storage cabinet, thereby reducing thermal impact of the battery boxes on a high-voltage unit, a low-voltage unit and a thermal management unit in the integration cabinet, improving space utilization of the energy storage cabinet, and improving the use stability of the energy storage system.

Description

Energy storage system and energy storage cabinet thereof

[0001] The present application claims priority to the Chinese patent application No. 202421931263.X, filed on August 9, 2024 in the China Patent Office and entitled "Energy storage system and energy storage cabinet thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage equipment, more specifically, to an energy storage system and an energy storage cabinet thereof. BACKGROUND

[0003] In a container-type energy storage cabinet, a battery module is usually arranged, and a plurality of functional modules, such as a control module and a power distribution module, are also installed. Since a large amount of heat is generated by the battery module during use, the control module and the power distribution module are disturbed by the heat, which affects the stability of the energy storage system. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide an energy storage system and an energy storage cabinet thereof, which aims to solve the technical problem of relatively weak stability of the existing energy storage system to some extent.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0006] In a first aspect, an energy storage system is provided, comprising:

[0007] At least one energy storage cabinet, the energy storage cabinet comprising a first high-voltage interface, a first low-voltage interface, and a fluid pipeline interface; the energy storage cabinet containing a plurality of electric boxes, the electric boxes containing battery monomers, the volume of the energy storage cabinet being V1, the total volume of the plurality of electric boxes being V2, 0.5≤V2 / V1;

[0008] An integrated cabinet, the integrated cabinet being provided with a high-voltage unit, a low-voltage unit, and a thermal management unit, the integrated cabinet comprising a second high-voltage interface, a second low-voltage interface, and a thermal management unit interface; one integrated cabinet is arranged correspondingly to at least one energy storage cabinet, the second high-voltage interface of the integrated cabinet being connected to the first high-voltage interface of the at least one energy storage cabinet, the second low-voltage interface of the integrated cabinet being connected to the first low-voltage interface of the at least one energy storage cabinet, and the thermal management unit interface of the integrated cabinet being connected to the fluid pipeline interface of the at least one energy storage cabinet.

[0009] In the energy storage system provided in the embodiments of the present application, the electric box is arranged in the energy storage cabinet, and some functional modules (at least including a high-voltage unit, a low-voltage unit and a thermal management unit) are arranged in the integrated cabinet, so as to reduce the thermal interference between the battery unit and the functional modules and improve the use stability of the energy storage system. Since the high-voltage unit, the low-voltage unit and the thermal management unit do not need to be installed in the energy storage cabinet, the space for installing the electric box in the energy storage cabinet is increased. 0.5≤V2 / V1, so that the volume ratio of the electric box in the energy storage cabinet is large, the space utilization of the energy storage cabinet is improved, and the volume energy density of the energy storage cabinet is improved.

[0010] In a possible design, V2 / V1≤0.8.

[0011] In this arrangement, in addition to installing the electric box, the energy storage cabinet also has a certain installation operation space, so as to facilitate installation and improve installation efficiency.

[0012] In a possible design, 0.6≤V2 / V1≤0.7.

[0013] In this arrangement, the requirements of the volume energy density and the assembly difficulty of the energy storage cabinet are considered, which is beneficial to reduce the manufacturing cost of the energy storage cabinet and improve the volume energy density of the energy storage cabinet.

[0014] In a possible design, the energy storage cabinet includes N1 parallel battery clusters, each battery cluster includes N2 series-connected battery monomers, 1≤N1, 405≤N2≤432.

[0015] In this arrangement, the parallel connection of the battery clusters can increase the battery capacity of the energy storage cabinet, the series connection of the battery monomers can increase the voltage of the energy storage cabinet, the number of the series-connected battery monomers can be set to adjust the voltage of the energy storage cabinet, and the number of the parallel-connected battery clusters can be set to adjust the battery capacity of the energy storage cabinet, so that the energy storage system can be adapted to different use requirements.

[0016] In a possible design, the electric box is provided with a plurality of battery monomers, the volume of a single battery monomer is V3, and 0.006≤V3 / V2.

[0017] In this arrangement, the volume ratio of a single battery monomer in the cabinet body is relatively large, so that the number of the battery monomers arranged in the electric box is relatively small to meet the battery capacity requirement, the connection operation time between the battery monomers and the electric box is reduced, and the assembly efficiency of the battery monomers in the electric box is improved.

[0018] In a possible design, V3 / V2≤0.016.

[0019] In this arrangement, the volume energy density of the energy storage cabinet, the manufacturing difficulty of the battery cell are considered, the volume energy density of the energy storage cabinet is improved, and the manufacturing difficulty and cost of the battery cell are reduced.

[0020] In a possible design, the energy storage cabinet further includes a DC / DC converter connected with the battery cluster.

[0021] In this arrangement, the DC / DC converter is used to adjust the output voltage of the battery cluster, and improve the voltage stability.

[0022] In a possible design, the capacity of a single battery cell is C, and 600 Ah≤C≤1500 Ah.

[0023] In this arrangement, the number of connecting pieces between the battery cells is relatively small, and the space utilization is improved.

[0024] In a possible design, the size of a single integrated cabinet is the same as that of a standard container, and the size of two or more energy storage cabinets is the same as that of an integrated cabinet.

[0025] A single integrated cabinet can be accommodated in a standard container, and two or more energy storage cabinets can be accommodated in a standard container.

[0026] In this arrangement, the size of the integrated cabinet is larger than that of the energy storage cabinet, which is convenient for arranging relatively more structures to control more energy storage cabinets, and the size of the energy storage cabinet is smaller than that of the integrated cabinet, so that the weight of a single energy storage cabinet is relatively lighter, and easy to transport.

[0027] In a second aspect, an energy storage cabinet is provided, which includes a first high-voltage interface, a first low-voltage interface, and a fluid pipeline interface; the energy storage cabinet contains a plurality of electric boxes, and the electric boxes contain battery cells; the volume of the energy storage cabinet is V1, the total volume of the plurality of electric boxes is V2, and 0.5≤V2 / V1.

[0028] Since the energy storage cabinet is provided with the first high-voltage interface, the first low-voltage interface, and the fluid pipeline interface, it is not necessary to arrange high-voltage units, low-voltage units, and thermal management units in the energy storage cabinet, so that the space for installing the electric boxes in the energy storage cabinet is increased. Since 0.5≤V2 / V1, the volume proportion of the electric boxes in the energy storage cabinet is large, the space utilization of the energy storage cabinet is improved, and the volume energy density of the energy storage cabinet is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0030] Fig. 1 is a structural schematic diagram of an energy storage system according to an embodiment of the present application;

[0031] Fig. 2 is a structural schematic diagram of an energy storage cabinet according to an embodiment of the present application;

[0032] Fig. 3 is an exploded schematic diagram of an electric box in the energy storage cabinet according to an embodiment of the present application;

[0033] Fig. 4 is an exploded schematic diagram of a battery cell in the energy storage cabinet according to an embodiment of the present application;

[0034] Fig. 5 is a structural schematic diagram of the electric box in the energy storage cabinet according to an embodiment of the present application;

[0035] Fig. 6 is a schematic diagram of the relative position between the electric box and the cabinet body in the energy storage cabinet according to an embodiment of the present application;

[0036] Fig. 7 is a structural schematic diagram of the battery cell in the energy storage cabinet according to an embodiment of the present application;

[0037] Fig. 8 is a schematic diagram of the distribution of the battery cell in the electric box in the energy storage cabinet according to an embodiment of the present application;

[0038] Fig. 9 is a schematic diagram of the relative position between the electric box and the DC / DC converter in the energy storage cabinet according to an embodiment of the present application;

[0039] Fig. 10 is a structural schematic diagram of an integrated cabinet according to an embodiment of the present application;

[0040] Fig. 11 is a schematic diagram of the relative position between the integrated cabinet and the energy storage cabinet in the energy storage system according to an embodiment of the present application.

[0041] The labels involved in the above drawings are as follows: 1, energy storage system; 10, energy storage cabinet; 11, first high-voltage interface; 12, first low-voltage interface; 13, fluid pipeline interface; 14, accommodating cavity; 20, integrated cabinet; 21, second high-voltage interface; 22, second low-voltage interface; 23, thermal management unit interface; 100, electrical box; 110, upper box body; 120, lower box body; 200, battery cluster; 300, battery monomer; 310, shell; 311, casing; 312, end cover; 320, electrode terminal; 330, electrode assembly; 400, DC / DC converter; 510, high-voltage unit; 520, low-voltage unit; 530, thermal management unit. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0043] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0044] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated structure or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0047] The energy storage cabinet is used for storing electric energy. In the related art, a container type energy storage system includes a container, a battery and a function module matched with the battery are installed in the container, and the function module matched with the battery is, for example, a master control box, a power distribution cabinet, a water cooling unit and the like. In the working process of the energy storage system, the battery emits relatively large heat, and the heat will be transferred to the function module, so that the temperature of the function module rises, affecting the operation stability of the function module. Since the battery is the core structure of the energy storage cabinet, the container first needs to reserve a space for installing the battery, and then the function module is installed in the remaining space, which makes the installation position of each device in the function module be relatively limited, and the function module is relatively greatly affected by the heat of the battery. In addition, since the service life of the battery is usually relatively long, the service life of the function module is shorter than that of the battery, so the function module needs to be maintained and replaced more frequently than the battery, and since the installation position of the function module is relatively limited, the difficulty of replacement and maintenance is relatively high, so the maintenance cost of the energy storage cabinet is relatively high.

[0048] Based on the above consideration, in order to solve the above problems, the embodiment of the present application provides an energy storage system, which comprises an energy storage cabinet and an integrated cabinet. The energy storage cabinet is provided with a first interface, and an electric box is arranged in the energy storage cabinet, and the electric box contains battery monomers. The ratio of the total volume of the electric box to the volume of the energy storage cabinet is greater than or equal to 0.5. The integrated cabinet is provided with a second interface, and the first interface is connected with the second interface, so that the function module (such as a high-voltage unit, a low-voltage unit and a thermal management unit) of the energy storage cabinet and the integrated cabinet is connected. In this arrangement, the function module for controlling the energy storage cabinet is arranged in the integrated cabinet outside the energy storage cabinet. On the one hand, the distance between the function module and the battery monomers is increased, and the function module is less affected by the heat of the battery monomers. On the other hand, the installation of the function module in the energy storage cabinet is reduced, and the released space can be used to install relatively larger or more battery monomers, thereby improving the volume ratio of the battery monomers in the cabinet body, so as to improve the volume energy density of the energy storage system.

[0049] The energy storage cabinet provided by the embodiment of the present application is explained and described in detail below.

[0050] As shown in FIGS. 1-4, the energy storage system 1 provided by the embodiments of the present application includes an energy storage cabinet 10 and an integrated cabinet 20. The energy storage cabinet 10 includes a first high-voltage interface 11, a first low-voltage interface 12, and a fluid pipeline interface 13. The energy storage cabinet 10 contains a plurality of electric boxes 100, and the electric boxes 100 contain battery monomers 300. The volume of the energy storage cabinet 10 is V1, the total volume of the plurality of electric boxes 100 is V2, and 0.5≤V2 / V1. The integrated cabinet 20 is provided with a high-voltage unit 510, a low-voltage unit 520, and a thermal management unit 530. The integrated cabinet 20 includes a second high-voltage interface 21, a second low-voltage interface 22, and a thermal management unit interface 23. One integrated cabinet 20 is provided corresponding to at least one energy storage cabinet 10. The second high-voltage interface 21 of the integrated cabinet 20 is connected to the first high-voltage interface 11 of the at least one energy storage cabinet 10. The second low-voltage interface 22 of the integrated cabinet 20 is connected to the first low-voltage interface 12 of the at least one energy storage cabinet 10. The thermal management unit interface 23 of the integrated cabinet 20 is connected to the fluid pipeline interface 13 of the at least one energy storage cabinet 10.

[0051] The cabinet body of the energy storage cabinet 10 can be a standard part that meets the international standards or related Chinese national standards established by the International Organization ISO, or a non-standard part. The cabinet body of the energy storage cabinet 10 can be referred to as a container, and the energy storage cabinet 10 can be referred to as an energy storage container. The cabinet body of the energy storage cabinet 10 can have various shapes, such as a prism shape or a cylindrical shape. The prism can be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. As an example, the cabinet body of the energy storage cabinet 10 is a quadrangular prism, specifically, the cabinet body of the energy storage cabinet 10 is a cuboid.

[0052] The cabinet body of the energy storage cabinet 10 is used to form a containing cavity 14 for providing installation space for the electric boxes 100, and a plurality of electric boxes 100 are installed in the containing cavity 14. As an example, the cabinet body of the energy storage cabinet 10 has a top plate, a bottom plate, and a plurality of side plates connected between the top plate and the bottom plate. In a specific example, as shown in FIGS. 1 and 2, the cabinet body of the energy storage cabinet 10 can have a cuboid structure, and the cabinet body of the energy storage cabinet 10 includes a rectangular top plate and a bottom plate, and four side plates are provided between the top plate and the bottom plate and are sequentially connected to form a rectangular ring structure, and the top of the side plate is connected to the top plate, and the bottom of the side plate is connected to the bottom plate. At least one side plate is provided with an opening, and the opening is used for the electric box 100 to enter the containing cavity 14. A cabinet door is installed at the opening, and the cabinet door and the side plate can be slidingly connected or hinged, etc. The top plate, the side plate, and the bottom plate surround to form a containing cavity, and the containing cavity 14 can be exposed after the cabinet door is opened.

[0053] As shown in FIG. 2 and FIG. 3, the electric box 100 is used to provide a containing space for the battery monomer 300, the battery monomer 300 is installed in the electric box 100, and the electric box 100 plays a protective role for the battery monomer 300. The electric box 100 can be in various shapes, such as a prism, a cylinder, etc. The prism can be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. As an example, the electric box 100 is in a quadrangular prism shape, specifically, the electric box 100 is in a cuboid shape. The electric box 100 can include an upper box body 110 and a lower box body 120, the upper box body 110 and the lower box body 120 are connected, and the upper box body 110 and the lower box body 120 jointly enclose a containing space inside the electric box 100.

[0054] As shown in FIG. 3, the electric box 100 can accommodate one or more battery monomers 300.

[0055] The volume of the energy storage cabinet 10 is V1, and the volume of the energy storage cabinet 10 specifically refers to the volume of the area enclosed by the outer contour of the cabinet body of the energy storage cabinet 10. The volume of the energy storage cabinet 10 can be measured in various ways. For a regular-shaped energy storage cabinet 10, for example, the energy storage cabinet 10 is in a cuboid shape, the length, width, and height of the outer contour of the cabinet body of the energy storage cabinet 10 can be measured by measuring tools respectively, and the product of the length, width, and height of the energy storage cabinet 10 is the volume of the energy storage cabinet 10. The height direction of the cabinet body of the energy storage cabinet is parallel to the gravity direction of the energy storage cabinet 10, and the height direction, length direction, and width direction of the energy storage cabinet 10 are perpendicular to each other. As an example, as shown in FIG. 2, the length of the energy storage cabinet 10 is L1, the width of the energy storage cabinet 10 is W1, the height of the energy storage cabinet 10 is H1, and V1=L1*W1*H1. The volume of the containing cavity 14 is similar to the volume of the energy storage cabinet 10, and the volume of the containing cavity 14 has a certain correlation with the thickness of the wall plate of the cabinet body of the energy storage cabinet 10. In this embodiment, since the thickness of the wall plate of the cabinet body of the energy storage cabinet 10 is relatively small, the thickness of the wall plate of the cabinet body of the energy storage cabinet 10 is ignored.

[0056] The total volume of all the electric boxes 100 installed in the cabinet body of the energy storage cabinet 10 is V2, and the volume of the electric box 100 specifically refers to the volume of the area surrounded by the outer contour of the electric box 100. As shown in FIGS. 5 and 6, when the electric box 100 is a cuboid, the length of the electric box 100 is L2, the width of the electric box 100 is W2, the height of the electric box 100 is H2, and the volume of a single electric box 100 is V2', then V2' = L2*W2*H2. The volume of the internal area of the electric box 100 is similar to the volume of the electric box, and the volume of the internal area of the electric box 100 has a certain correlation with the thickness of the wall plate of the electric box 100. In this embodiment, the thickness of the wall plate of the electric box 100 is relatively small, so the thickness of the wall plate of the electric box 100 is ignored. The plurality of electric boxes 100 installed in the accommodating cavity 14 can be electric boxes 100 of the same volume, or electric boxes 100 of different volumes. In an example, the electric boxes 100 in the accommodating cavity 14 are electric boxes 100 of the same specification, and the volumes of the electric boxes 100 are equal. Taking the volume of a single electric box 100 as V2' and the number of electric boxes 100 as M, V2 = M*V2'.

[0057] V2 / V1 is the proportion of the total volume of the electric boxes 100 in the volume of the cabinet body of the energy storage cabinet, and the larger the ratio, the larger the volume of the energy storage cabinet 10 for accommodating the battery monomers 300, and the larger the volume energy density of the energy storage cabinet 10. 0.5≤V2 / V1, and exemplarily, V2 / V1 can be 0.50, 0.55, 0.60, 0.65, 0.68, 0.70, 0.75, 0.77, 0.80, 0.83, 0.88, 0.92, etc.

[0058] In this embodiment, 0.6≤V2 / V1, that is, the proportion of the total volume of the electric boxes 100 in the volume of the cabinet body of the energy storage cabinet 10 is 50% or more. Since the cabinet body of the energy storage cabinet 10 is provided with the first high-voltage interface 11, the first low-voltage interface 12 and the fluid pipeline interface 13, the functional modules (at least including the high-voltage unit 510, the low-voltage unit 520 and the thermal management unit 530) matched with the battery can be installed in the integrated cabinet 20 outside the energy storage cabinet 10, without occupying the internal space of the energy storage cabinet 10, thereby releasing the internal space of the energy storage cabinet 10 to accommodate more electric boxes 100, or to accommodate electric boxes 100 of larger volume. Accommodating more or larger electric boxes 100 can increase the proportion of the total volume of the electric boxes 100 in the volume of the cabinet body of the energy storage cabinet 10, and also increase the volume energy density of the energy storage cabinet 10.

[0059] The integrated cabinet 20 is provided with a high-voltage unit 510, a low-voltage unit 520, and a thermal management unit 530, that is, the integrated cabinet 20 integrates the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530 at least into one body. The integrated cabinet 20 has a cabinet body, and the cabinet body of the integrated cabinet 20 is used to provide a containing space for the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530. The cabinet body of the integrated cabinet 20 has a second inner cavity, and the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530 are installed in the second inner cavity. The cabinet body of the integrated cabinet 20 can be a standard part meeting an international standard established by an international organization ISO, or a non-standard part. The cabinet body of the integrated cabinet 20 can be referred to as a container. The cabinet body of the integrated cabinet 20 can have various shapes, such as a prism shape, a cylindrical shape, and the like. The prism can be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, or the like. As an example, the cabinet body of the integrated cabinet 20 is in the shape of a quadrangular prism, specifically, in the shape of a cuboid. The cabinet body of the integrated cabinet 20 has a top plate, a bottom plate, and a plurality of side plates connected between the top plate and the bottom plate. In a specific example, the cabinet body of the integrated cabinet 20 can be in the structure of a cuboid, and the cabinet body of the integrated cabinet 20 includes a rectangular top plate and a bottom plate, and four side plates are arranged between the top plate and the bottom plate, and the four side plates are sequentially connected to form a rectangular ring structure, and the top of the side plate is connected to the top plate, and the bottom of the side plate is connected to the bottom plate. At least one side plate is provided with a second opening, and the second opening is used for the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530 to be installed into the second inner cavity. A second cabinet door can be installed at the second opening, and the second cabinet door and the side plate can be in a sliding connection, a hinged connection, or the like.

[0060] The high-voltage unit 510 includes one or more high-voltage devices, and each high-voltage device in the high-voltage unit 510 is connected to the second high-voltage interface 21 through a high-voltage line.

[0061] The low-voltage unit 520 includes one or more low-voltage devices, and the low-voltage unit 520 can include low-voltage auxiliary devices and / or controller devices. Each low-voltage device in the low-voltage unit 520 is connected to the second low-voltage interface 22 through a low-voltage line.

[0062] The thermal management unit 530 is used to deliver a fluid medium to the energy storage cabinet 10. The fluid medium can be used to control the temperature of the energy storage cabinet 10, for example.

[0063] The energy storage cabinet 10 comprises a first high-voltage interface 11, and the integrated cabinet 20 comprises a second high-voltage interface 21. The first high-voltage interface 11 is connected with high-voltage lines in the energy storage cabinet 10. For example, the battery monomer 300 is connected with a high-voltage line, and the high-voltage lines connected with the battery monomer 300 in the energy storage cabinet 10 are all connected with the first high-voltage interface 11. The second high-voltage interface 21 is electrically connected with each high-voltage device in the high-voltage unit 510 in the integrated cabinet 20. The first high-voltage interface 11 is connected with the second high-voltage interface 21, so that the battery monomer 300 is connected with the high-voltage unit 510 in the integrated cabinet 20, and the battery monomer 300 is controlled by the high-voltage electrical control of the high-voltage unit 510 in the integrated cabinet 20. The first high-voltage interface 11 and the second high-voltage interface 21 can comprise plug-in connectors. The first high-voltage interface 11 and the second high-voltage interface 21 can be connected by plug-in. In some examples, the first high-voltage interface 11 and the second high-voltage interface 21 can be connected by a high-voltage adapter line, and the high-voltage adapter line is provided with a connection terminal at both ends, one of which is connected with the first high-voltage interface 11, and the other is connected with the second high-voltage interface 21, so as to connect the first high-voltage interface 11 and the second high-voltage interface 21 by the high-voltage adapter line. The second high-voltage interface 21 and each high-voltage device can be plug-in connected, and the connection terminal of each high-voltage device is plug-in connected at the second high-voltage interface 21. This connection method is convenient and helps to improve the assembly efficiency of the integrated cabinet 20. Since each high-voltage device in the high-voltage unit 510 installed in the integrated cabinet 20 is connected with the second high-voltage interface 21, connecting the second high-voltage interface 21 with the first high-voltage interface 11 can make the battery monomer 300 in the energy storage cabinet 10 connected with each high-voltage device in the integrated cabinet 20, thereby improving the assembly efficiency. Since the second high-voltage interface 21 of one integrated cabinet 20 can be electrically connected with the first high-voltage interface 11 of multiple energy storage cabinets 10, the high-voltage electrical control of the battery monomer 300 in the multiple energy storage cabinets 10 can be performed by the high-voltage unit 510 in the integrated cabinet 20, which is equivalent to integrating the high-voltage devices for controlling the battery monomer 300 in the multiple energy storage cabinets 10 in the high-voltage unit 510 of the integrated cabinet 20, thereby improving the integration degree of the integrated cabinet 20. The connection between the first high-voltage interface 11 and the second high-voltage interface 21 can be plug-in type, which improves the connection and assembly efficiency.

[0064] The energy storage cabinet 10 comprises a first low-voltage interface 12, and the integrated cabinet 20 comprises a second low-voltage interface 22. The first low-voltage interface 12 is connected with low-voltage lines in the energy storage cabinet 10. For example, the battery monomer 300 is connected with a low-voltage line, and the low-voltage lines connected with the battery monomer 300 in the energy storage cabinet 10 are all connected with the first low-voltage interface 12. The second low-voltage interface 22 is electrically connected with each low-voltage device in the low-voltage unit 520 in the integrated cabinet 20. The first low-voltage interface 12 is connected with the second low-voltage interface 22, so that the battery monomer 300 is connected with the low-voltage unit 520 in the integrated cabinet 20, and the battery monomer 300 is controlled by the low-voltage electrical control of the low-voltage unit 520 in the integrated cabinet 20. The first low-voltage interface 12 and the second low-voltage interface 22 can comprise plug-in connectors. The first low-voltage interface 12 and the second low-voltage interface 22 can be connected by plug-in. In some examples, the first low-voltage interface 12 and the second low-voltage interface 22 can be connected by a low-voltage adapter line, and the low-voltage adapter line is provided with a connection terminal at both ends, one of which is connected with the first low-voltage interface 12, and the other is connected with the second low-voltage interface 22, so as to connect the first low-voltage interface 12 and the second low-voltage interface 22 by the low-voltage adapter line. The second low-voltage interface 22 and each low-voltage device can be plug-in connected, and the connection terminal of each low-voltage device is plug-in connected at the second low-voltage interface 22. This connection method is high in convenience and is conducive to improving the assembly efficiency of the integrated cabinet 20. Since each low-voltage device in the low-voltage unit 520 installed in the integrated cabinet 20 is connected with the second low-voltage interface 22, connecting the second low-voltage interface 22 with the first low-voltage interface 12 can make the battery monomer 300 in the energy storage cabinet 10 connected with each low-voltage device in the integrated cabinet 20, thereby improving the assembly efficiency. Since the second low-voltage interface 22 of one integrated cabinet 20 can be electrically connected with the first low-voltage interface 12 of multiple energy storage cabinets 10, the low-voltage electrical control of the battery monomer 300 in the multiple energy storage cabinets 10 can be realized by the low-voltage unit 520 in the integrated cabinet 20, which is equivalent to integrating the low-voltage devices for controlling the battery monomer 300 in the multiple energy storage cabinets 10 in the low-voltage unit 520 of the integrated cabinet 20, thereby improving the integration degree of the integrated cabinet 20. The connection between the first low-voltage interface 12 and the second low-voltage interface 22 can be plug-in type, thereby improving the connection and assembly efficiency.

[0065] The energy storage cabinet 10 comprises a fluid pipeline interface 13, the energy storage cabinet 10 is filled with a fluid medium, the fluid pipeline interface 13 is used for the fluid medium in the energy storage cabinet 10 to flow in or out, and the fluid medium can be used for heat exchange with the battery monomer 300 to control the temperature of the battery monomer 300. Exemplarily, the fluid medium can comprise cooling liquid, and the cooling liquid is used for heat dissipation of the battery monomer 300. The energy storage cabinet 10 can adopt immersion cooling or structural cooling. The immersion cooling is that the entire accommodating cavity 14 of the energy storage cabinet 10 is filled with cooling liquid, and the battery monomer 300 is immersed in the cooling liquid. The fluid pipeline interface 13 of the energy storage cabinet 10 is in communication with the accommodating cavity 14 of the energy storage cabinet 10, and the cooling liquid can be introduced into the accommodating cavity 14 of the energy storage cabinet 10 through the fluid pipeline interface 13. The structural cooling is that the water cooling structure is arranged in the energy storage cabinet 10, the water cooling structure can comprise one or more water cooling structures such as a water cooling pipe and a water cooling plate, the water cooling structure has a flow channel, and the flow channel is filled with cooling liquid. The water cooling structure is in contact with the battery monomer 300, thereby heat dissipation of the battery monomer 300 is performed. The water cooling structure is connected with the fluid pipeline interface 13 of the energy storage cabinet, so that the flow channel of the water cooling structure is in communication with the fluid pipeline interface 13, and the flow channel of the water cooling structure can be controlled to introduce or discharge the cooling liquid through the fluid pipeline interface 13.

[0066] In the energy storage system 1 provided in the embodiments of the present application, the battery monomer 300 is arranged in the electric box 100 in the energy storage cabinet 10, and the high-voltage unit 510 for high-voltage electrical control of the battery monomer 300, the low-voltage unit 520 for low-voltage electrical control of the battery monomer 300, and the thermal management unit 530 for thermal management of the battery monomer 300 are arranged in the integrated cabinet 20. On the one hand, since each high-voltage device in the high-voltage unit 510 is connected with the second high-voltage interface 21, the connection between the high-voltage unit 510 and the battery monomer 300 can be realized by connecting the second high-voltage interface 21 with the first high-voltage interface 11. In this way, the distance between the high-voltage unit 510 and the battery monomer 300 is increased, the distance between the low-voltage unit 520 and the battery monomer 300 is increased, and the distance between the thermal management unit 530 and the battery monomer 300 is increased, so that the high-voltage unit 510, the low-voltage unit 520 and the thermal management unit 530 are less affected by the thermal interference in the use process of the battery monomer 300, thereby improving the stability of the integrated cabinet 20 and further improving the stability of the energy storage system 1. Since the high-voltage unit 510, the low-voltage unit 520 and the thermal management unit 530 are all installed in the integrated cabinet 20, and the battery monomer 300 is not installed in the integrated cabinet 20, the installation positions of the high-voltage unit 510, the low-voltage unit 520 and the thermal management unit 530 are not limited by the installation position of the battery monomer 300, so that the high-voltage unit 510, the low-voltage unit 520 and the thermal management unit 530 can be more reasonably arranged in the integrated cabinet 20, the space utilization rate in the integrated cabinet 20 can be improved, and the maintenance and management of the high-voltage unit 510, the low-voltage unit 520 and the thermal management unit 530 can be facilitated.

[0067] In one possible design, V2 / V1≤0.8. Exemplarily, V2 / V1 can be 0.62, 0.66, 0.69, 0.72, 0.76, 0.78, 0.80, etc.

[0068] In the embodiment, V2 / V1≤0.8, that is, the total volume of the electric box 100 accounts for less than 80% of the volume of the energy storage cabinet 10. In this way, in the interior of the energy storage cabinet 10, in addition to the installation of the electric box 100, there is other space, which can be used as the installation operation space of the electric box 100, can be used for wiring, can also make the electric box 100 be placed at intervals, and can be used for laying fire-fighting structures, cooling structures and the like. Reserving space in the energy storage cabinet 10 as the installation operation space of the electric box 100 can reduce the installation operation difficulty of the electric box 100 and improve the installation efficiency of the electric box 100. Reserving space in the energy storage cabinet 10 as the wiring space can reduce the wiring difficulty and improve the assembly efficiency of the energy storage cabinet 10. Reserving space in the energy storage cabinet 10 so that the electric box 100 can be placed at intervals can improve the heat dissipation efficiency of the electric box 100 and reduce the thermal interference between adjacent electric boxes 100. Reserving space in the energy storage cabinet 10 for laying fire-fighting structures, cooling structures and the like can improve the safety performance of the energy storage cabinet 10.

[0069] In a possible design, 0.6≤V2 / V1≤0.7, for example, V2 / V1 can be 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70 or the like.

[0070] In the embodiment, 0.6≤V2 / V1, that is, the total volume of the electric box 100 accounts for more than 60% of the volume of the energy storage cabinet 10. Since the total volume of the electric box 100 accounts for a relatively larger proportion in the cabinet body of the energy storage cabinet 10, more or larger battery monomers 300 can be accommodated in the electric box 100, so that the volume energy density of the energy storage cabinet 10 is increased.

[0071] In the embodiment, V2 / V1≤0.7, that is, the total volume of the electric box 100 accounts for less than 70% of the volume of the cabinet body of the energy storage cabinet 10. In the energy storage cabinet 10, the number of electric boxes 100 is multiple, and the installation of the electric boxes 100 needs a certain assembly space, the connection between the electric boxes 100 and the first high-voltage interface 11, the connection between the electric boxes 100 and the first low-voltage interface 12 all need a certain connection space, for example, the electric boxes 100 and the first high-voltage interface 11, the electric boxes 100 and the first low-voltage interface 12 can be connected through cables, and then the cable wiring space needs to be laid in the cabinet body of the energy storage cabinet 10. Within the range of the total volume of the electric box, there is relatively sufficient assembly space in the cabinet body of the energy storage cabinet 10, which is conducive to improving the assembly efficiency and reducing the assembly cost.

[0072] In one possible design, the volume of a single electric box 100 is V2', and 0.03≤V2' / V1≤0.05. In this embodiment, V2' / V1 can be 0.030, 0.035, 0.040, 0.045, 0.050, etc., and V2' / V1 can be a point value or a range value. The volumes of the plurality of electric boxes 100 in the energy storage cabinet 10 can be the same or different. When the plurality of electric boxes 100 have different volumes, for example, the volume ratio of a number of electric boxes 100 to the volume of the energy storage cabinet 10 can be 0.3, and the volume ratio of a number of electric boxes 100 to the volume of the energy storage cabinet 10 can be 0.3. When all the electric boxes 100 in the energy storage cabinet 10 are of the same size, for example, the volume ratio of each electric box 100 to the volume of the energy storage cabinet 10 can be 0.4.

[0073] Since the volume ratio of the total volume of the plurality of electric boxes 100 to the volume of the energy storage cabinet 10 needs to satisfy 0.6≤V2 / V1≤0.7, the size of the volume of a single electric box 100 has a certain influence on the number of electric boxes 100 that can be installed in the energy storage cabinet 10. The larger the volume of a single electric box 100, the larger the volume ratio of the electric box 100 to the volume of the energy storage cabinet 10, and the fewer the number of electric boxes 100 installed in the energy storage cabinet 10. The smaller the volume of a single electric box 100, the smaller the volume ratio of the electric box 100 to the volume of the energy storage cabinet 10, and the greater the number of electric boxes 100 installed in the energy storage cabinet 10. The electric box 100 can be fixed or limited in the accommodation cavity 14. For example, the electric box 100 is fixedly installed in the accommodation cavity 14 by a fixing structure. When the number of electric boxes 100 is relatively small, the number of required fixing structures is relatively small, and the number of required fixed connection steps is relatively small. When the number of electric boxes 100 is relatively large, the volume of a single electric box 100 is relatively small, the weight of a single electric box 100 is relatively small, transportation is more convenient during assembly, and the structural strength requirement of the fixing structure required to fix the electric box 100 is relatively low. In this embodiment, 0.03≤V2' / V1≤0.05, so that a proper number of electric boxes 100 can be placed in the energy storage cabinet 10, transportation and assembly are facilitated, and the volume energy density of the energy storage cabinet 10 can be improved. In one example, V2' / V1 is 0.03, and when 0.6≤V2 / V1≤0.7, the number of electric boxes 100 can be 20, 21, 22, or 23. In another example, V2' / V1 is 0.05, and when 0.6≤V2 / V1≤0.7, the number of electric boxes 100 can be 12, 13, or 14. When 0.03≤V2' / V1≤0.05 and 0.6≤V2 / V1≤0.7, the number of electric boxes 100 can be 12 to 23.

[0074] In one possible design, as shown in FIGS. 3 and 4, a plurality of battery monomers 300 are arranged in the electric box 100, the battery monomer 300 includes a shell 310 and an electrode terminal 320, the electrode terminal 320 is mounted on the shell 310, the sum of the volumes of the shells 310 of all the battery monomers 300 in the energy storage cabinet 10 is V4, and 0.4≤V4 / V1≤0.5.

[0075] In the embodiments of the present application, the battery monomer 300 can be a secondary battery, which refers to a battery monomer 300 that can be activated by charging after discharging. The battery monomer 300 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application.

[0076] The battery monomer 300 can be a cylindrical battery monomer, a prismatic battery monomer, a soft-pack battery monomer 300, or other shapes of battery monomers, and the prismatic battery monomer includes a square battery monomer, a blade-shaped battery monomer, and a multi-prismatic battery, such as a hexagonal prism battery, etc.

[0077] As shown in FIG. 4, the battery monomer 300 includes a shell 310, an electrode terminal 320, and an electrode assembly 330. The shell 310 includes a shell body 311 and an end cover 312, the shell body 311 has an opening, and the end cover 312 is covered at the opening of the shell body 311 to form an inner cavity with the shell body 311. The shell 310 can be a steel shell, an aluminum shell, a plastic shell, a composite metal shell, or an aluminum-plastic film, etc. The electrode assembly 330 can be a winding structure or a laminated structure. The electrode assembly 330 is mounted in the inner cavity, and the electrode assembly 330 includes an electrode core body, the electrode core body is provided with tabs, and the tabs include positive tabs and negative tabs. The end cover 312 assembly includes a top cover and a top cover patch, and the top cover patch is arranged on the side of the top cover away from the shell body 311. The electrode terminal 320 is mounted on the top cover, and the electrode terminal 320 includes a positive electrode terminal and a negative electrode terminal. The positive tabs are connected with the positive electrode terminal, and the negative tabs are connected with the negative electrode terminal. The tabs are connected with the electrode terminal 320 through adapter plates. The adapter plates are used to prevent damage to the battery or burning of other components when the electrode assembly 330 is short-circuited or overcharged or over-discharged, so as to ensure the safety of the battery in use.

[0078] In one arrangement, a plurality of battery monomers 300 are arranged in the electric box 100, the volume of a single battery monomer 300 is V3, and 0.006≤V3 / V2. That is, the volume of a single battery monomer 300 accounts for more than or equal to 0.6% in the electric box. For example, V3 / V2 can be 0.006, 0.009, 0.011, 0.014, 0.015, 0.018, 0.019, etc.

[0079] The volume of the single battery cell 300 is the volume of the shell 310 of the battery cell 300, which is the volume of the region surrounded by the outer contour of the shell 310. For example, as shown in FIGS. 7 and 8, when the shell 310 is a cuboid, the length of the shell 310 is L3, the width of the shell 310 is W3, and the height of the shell 310 is H3, then V3=L3*W3*H3. When the electrode terminal 320 protrudes outside the shell 310, the volume of the shell 310 is less than the volume of the battery cell 300. The volume of the shell 310 is in a certain positive proportion to the volume of the electrode assembly 330, that is, the larger the volume of the shell 310, the larger the space inside the shell 310 for accommodating the electrode assembly 330 under the condition that the wall thickness of the shell 310 is constant, the larger the volume of the electrode assembly 330 that can be accommodated, and the larger the volumetric energy density of the battery cell 300. The volumes of the shells 310 of the plurality of battery cells 300 installed in the same electric box 100 can be the same or different. In an example, all the battery cells 300 in the electric box 100 are of the same specification, and the volumes of the shells 310 of the battery cells 300 are the same. The number of the battery cells 300 in the electric box 100 is N, and the total volume V4 of the battery cells 300 in the electric box 100 is N*V3. The plurality of battery cells 300 installed in the same electric box 100 can be electrically connected through the electric connector, and the plurality of battery cells 300 can be in series, parallel, or mixed connection. The electric connector can be a metal plate structure. In addition to the battery cells 300, the electric box 100 also has the electric connector for electrically connecting the plurality of battery cells 300, and the total volume of the shells 310 of the battery cells 300 in the electric box 100 can more effectively reflect the volumetric energy density of the energy storage cabinet 10.

[0080] In this arrangement, since the volume proportion of the single battery cell 300 in the electric box 100 is relatively large, the number of the battery cells 300 installed in the electric box 100 is relatively small under the condition that the volume of the electric box 100 is constant, and the number of the electric connectors for connecting the battery cells 300 arranged in the electric box 100 is relatively small, which can reduce the assembly time of the electric box 100 and improve the assembly efficiency of the electric box 100.

[0081] In some embodiments, V3 / V2≤0.016. That is, the volume of the single battery cell 300 in the electric box 100 is less than or equal to 1.6%.

[0082] Exemplarily, V3 / V2 can be 0.006, 0.007, 0.008, 0.009, 0.010, 0.011, 0.012, 0.013, 0.014, 0.015, 0.016, etc. The volume of a single battery cell 300 is relatively small, so that a plurality of battery cells 300 can be installed in the electric box 100, which facilitates more efficient use of the space in the electric box 100, so that the total volume of the battery cells 300 in the electric box 100 accounts for a larger proportion of the volume of the electric box, thereby improving the volumetric energy density of the electric box. In addition, the relatively small volume of a single battery cell 300 facilitates production, transportation and installation. This arrangement takes into account the volumetric energy density of the energy storage cabinet and the ease of manufacturing of the battery cell, which facilitates improvement of the volumetric energy density of the energy storage cabinet and reduction of the manufacturing difficulty and cost of the battery cell.

[0083] During transportation of the energy storage system 1, the integrated cabinet 20 can be transported as a whole, or can be split into a plurality of modules for transportation, for example, the high-voltage unit 510 is transported as an independent module, the low-voltage unit 520 is transported as an independent module, the thermal management unit 530 is transported as an independent module, and the cabinet body of the integrated cabinet 20 is transported as an independent module, which can reduce the weight of the independent module. During transportation of the energy storage system 1, the energy storage cabinet 10 can be transported as a whole, or can be split into a plurality of modules for transportation, for example, the cabinet body of the energy storage cabinet 10 is transported as an independent module, and a plurality of electric boxes 100 in the energy storage cabinet 10 are divided into a plurality of groups, one group including a plurality of electric boxes 100, and one group of electric boxes 100 is transported as an independent module. Exemplarily, sixteen electric boxes 100 are included in one energy storage cabinet 10, and the energy storage cabinet 10 can be split into three independent modules for transportation, one independent module being the cabinet body of the energy storage cabinet 10, one independent module being eight electric boxes 100, and the other independent module being the other eight electric boxes 100. The above-described arrangement of splitting the integrated cabinet 20 and the energy storage cabinet 10 into a plurality of independent modules for separate transportation makes the energy storage system 1 modular, facilitating transportation.

[0084] In the electric box 100, a heat insulation pad, a buffer pad, a high-voltage connector, a low-voltage connector, etc. can also be arranged. Each structure in the electric box 100 needs a certain installation gap, so the battery cell 300 does not occupy the entire space inside the electric box 100. The size and number of battery cells 300 installed in the electric box 100 need to take into account the length, width, height of the battery cell 300, as well as the length, width, height of the electric box 100, and also need to reserve installation space for other structures in the electric box 100 in addition to the battery cell 300.

[0085] In a possible design, as shown in FIGS. 5-8, the length of the electric box 100 is L2, the length of the battery monomer 300 is L3, and 0.2≤L3 / L2≤0.4. Exemplarily, L3 / L2 can be 0.2, 0.3, 0.4, etc. In this arrangement, one, two, three, four, or five battery monomers 300 can be arranged in the length direction of the electric box 100. That is, this arrangement allows multiple battery monomers 300 to be arranged in the length direction of the electric box 100, facilitating the limited installation of the battery monomers 300 in the electric box 100 and effectively utilizing the internal space of the electric box 100.

[0086] In a possible design, the width of the electric box 100 is W2, the width of the battery monomer 300 is W3, and 0.02≤W3 / W2≤0.07. Exemplarily, W3 / W2 can be 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, etc. In this arrangement, at least one battery monomer 300 and at most 14-50 battery monomers 300 can be arranged in the width direction of the electric box 100. In this arrangement, multiple battery monomers 300 can be arranged in the width direction of the electric box 100, and the battery monomers 300 arranged adjacent to each other can limit each other, facilitating the limited installation of the battery monomers 300 in the electric box 100.

[0087] In a possible design, the height of the electric box 100 is H2, the height of the battery monomer 300 is H3, and 0.5≤H3 / H2<1. Exemplarily, H3 / H2 can be 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc. When 0.5≤H3 / H2, the height of the shell 310 of the battery monomer 300 accounts for 50% or more of the height of the electric box 100, so that the height of the battery monomer 300 accounts for a relatively large proportion in the electric box 100, thereby increasing the volumetric energy density of the electric box 100. When H3 / H2<1, the height of the battery monomer 300 is close to but not equal to the height of the electric box 100, because the electric box 100 has a certain wall thickness.

[0088] In the embodiment, the battery monomer 300 in the electric box 100 can be placed in various ways, such as vertically, laterally, or horizontally. When the battery monomer 300 in the electric box 100 is vertically placed, the electrode terminal 320 is arranged at the top of the shell 310, and the electrode terminal 320 can protrude from the top surface of the shell 310. When the battery monomer 300 in the electric box 100 is laterally placed, the electrode terminal 320 is arranged at the side of the shell 310, and is located at the side defined by the width direction and the height direction of the shell 310. In the state that the battery monomer 300 is laterally placed in the electric box 100, the area of the side of the battery monomer 300 defined by the length direction and the height direction is greater than the area of the side defined by the width direction and the height direction, and the area of the side defined by the length direction and the width direction is greater than the area of the side defined by the length direction and the height direction. When the battery monomer 300 in the electric box 100 is horizontally placed, the electrode terminal 320 is arranged at the side of the shell 310, and is located at the side defined by the width direction and the height direction of the shell 310. In the state that the battery monomer 300 is horizontally placed in the electric box 100, the area of the side of the battery monomer 300 defined by the length direction and the width direction is greater than the area of the side defined by the width direction and the height direction, and the area of the side defined by the length direction and the width direction is greater than the area of the side defined by the length direction and the height direction.

[0089] In a possible design, as shown in FIG. 2 and FIG. 7, the length of the cabinet body of the energy storage cabinet 10 is L1, the length of the battery monomer 300 is L3, and 0.1≤L3 / L1≤0.2. In this arrangement, a plurality of battery monomers 300 can be arranged and placed in the length direction of the energy storage cabinet 10, facilitating the installation of the battery monomers 300 in the energy storage cabinet 10.

[0090] In a possible design, as shown in FIG. 2 and FIG. 7, the width of the energy storage cabinet 10 is W1, the width of the battery monomer 300 is W3, and 0.02≤W3 / W1≤0.06. In this arrangement, a plurality of battery monomers 300 can be arranged and placed in the width direction of the energy storage cabinet 10, facilitating the installation of the battery monomers 300 in the energy storage cabinet 10.

[0091] In a possible design, as shown in FIG. 2 and FIG. 7, the height of the energy storage cabinet 10 is H1, the height of the battery monomer 300 is H3, and 0.06≤H3 / H1≤0.09. In this arrangement, a plurality of battery monomers 300 can be arranged and placed in the height direction of the energy storage cabinet 10, facilitating the installation of the battery monomers 300 in the energy storage cabinet 10.

[0092] In a possible design, the energy storage cabinet 10 further comprises a water cooling structure accommodated in the accommodating cavity, and the water cooling structure is used for heat dissipation of the battery unit; the fluid pipeline interface 13 of the energy storage cabinet 10 is connected with the water cooling structure.

[0093] The water cooling structure is used for heat dissipation of the battery cells, and can include a water cooling plate and a water cooling pipe. The water cooling structure includes the water cooling plate and the water cooling pipe. The water cooling plate is installed on the electric box 100. For example, the water cooling plate can be installed on the bottom or side of the electric box 100, or can be installed inside the electric box 100 between two adjacent battery cells 300. When the water cooling plate is installed on the side of the electric box 100, the water cooling plate can be connected to the side wall of the electric box 100, or can be integrated with the side wall of the electric box 100, that is, the water cooling plate is used as the side wall or part of the side wall of the electric box 100. When the water cooling plate is installed on the bottom of the electric box 100, the water cooling plate can be connected to the bottom plate of the electric box 100, or can be integrated with the bottom plate of the electric box 100, that is, the water cooling plate is used as the bottom plate or part of the bottom plate of the electric box 100. The water cooling plate is in contact with the battery cell 300. The water cooling plate is provided with a liquid flow channel, and the liquid flow channel is in communication with the water cooling pipe. The water cooling pipe is at least partially located outside the electric box 100, and the water cooling pipe is in communication with the fluid pipe interface 13. The fluid pipe interface 13 is connected to the heat management unit 530. The heat management unit 530 is used for pumping cooling liquid into the water cooling pipe through the fluid pipe interface 13. The cooling liquid enters the liquid flow channel through the water cooling pipe to dissipate heat for the battery cell 300.

[0094] The heat management unit 530 can include a water cooling unit, and the water cooling unit includes a pumping device. The pumping device is used for pumping a fluid medium to the water cooling structure to provide heat exchange between the fluid medium and the battery cell 300.

[0095] In this arrangement, the water cooling structure improves the heat dissipation performance of the battery cell 300. The water cooling structure is connected to the heat management unit 530 of the integrated cabinet 20, so that the heat management unit 530 does not need to be installed in the energy storage cabinet 10, thereby releasing the internal space of the energy storage cabinet 10.

[0096] In a possible design, the energy storage cabinet 10 further includes a sampling unit installed in the electric box 100. The sampling unit can include a sensor, a sampling harness, and the like. The sensor can be one or more of a temperature sensor, a pressure sensor, a voltage sensor, a current sensor, and the like. The sampling unit can be used to detect information such as voltage, current, temperature, pressure, and the like of the battery monomer 300. The integrated cabinet 20 can be provided with a battery management module (BMS). The battery management module is connected with the battery monomer 300, and is used for intelligently managing and maintaining the battery monomer 300, monitoring the state of the battery monomer 300, and reducing or even avoiding overcharging or overdischarging of the battery monomer 300 to some extent, so as to prolong the service life of the battery monomer 300. It should be noted that the battery management module includes a plurality of high-voltage electrical components and a plurality of low-voltage electrical components. The high-voltage electrical components in the battery management module belong to the high-voltage unit 510 in the integrated cabinet 20 and are installed in the high-voltage area in the integrated cabinet 20. The low-voltage electrical components in the battery management module belong to the low-voltage unit 520 and are installed in the low-voltage area in the integrated cabinet 20.

[0097] In some embodiments, the energy storage cabinet is provided with a fire-fighting structure, the low-voltage unit 520 of the integrated cabinet 20 includes a fire-fighting control module, the fire-fighting structure is connected with the first low-voltage interface 12, and the fire-fighting control module is connected with the second low-voltage interface 22, so as to realize control of the fire-fighting control module on the fire-fighting structure. The fire-fighting structure can include a fire-fighting pipeline, a spray head, a detection structure, and the like. The spray head is in communication with the fire-fighting pipeline. The fire-fighting pipeline is used to spray liquid into the energy storage cabinet 10 through the spray head to achieve the effect of fire extinguishing. The detection structure can include a smoke sensor, a temperature sensor, and the like. The detection structure is used to detect whether the energy storage cabinet 10 is on fire. The detection structure and the fire-fighting pipeline are respectively connected with the fire-fighting control module. The fire-fighting control module is used to control the conduction state of the fire-fighting pipeline according to the feedback of the detection structure. Exemplarily, an electromagnetic valve can be arranged on the fire-fighting pipeline. The electromagnetic valve is connected with the first interface. The opening and closing state of the electromagnetic valve is controlled by the fire-fighting control module, so as to control the conduction state of the fire-fighting pipeline. In this arrangement, the arrangement of the fire-fighting structure improves the safety of the energy storage cabinet 10. The fire-fighting control module is arranged in the integrated cabinet 20, so as to improve the space utilization of the energy storage cabinet 10 and be conducive to improving the volume energy density of the energy storage cabinet 10.

[0098] In a possible design, the voltage of the battery monomer 300 is U1, 2.5V≤U1≤3.65V. The voltage of the battery monomer 300 is an important parameter of the performance of the battery monomer 300, which is related not only to the discharge efficiency of the battery monomer 300, but also closely related to the safety, stability and service life of the battery monomer 300. In the case of 2.5V≤U1≤3.65V, the chemical reaction of the battery monomer 300 is more stable, which helps to reduce the chemical decomposition of the battery monomer 300 during charging and discharging, and prolong the service life of the battery monomer 300. The stable voltage range can reduce the heat accumulation in the battery monomer 300, and can reduce the risk of thermal runaway of the battery monomer 300, thereby improving the safety performance of the battery monomer 300.

[0099] In a possible design, 2.8V≤U1≤3.6V. In this voltage range, the overcharging or overdischarging of the battery monomer 300 can be reduced, thereby the service life of the battery monomer 300 can be improved. In this voltage range, the battery monomer 300 has stronger adaptability to the ambient temperature, and can be adapted to more use scenarios. In the voltage range of the battery monomer 300, the battery monomer 300 can effectively convert and store energy, and improve the energy utilization rate of the battery monomer 300. In this voltage range, the internal resistance of the battery monomer 300 is relatively low, which can reduce the loss of energy in the transmission process and improve the charging and discharging efficiency.

[0100] In some possible arrangements, the energy storage cabinet 10 includes N1 parallel battery clusters 200, each battery cluster 200 includes N2 battery monomers 300 connected in series, 1≤N1, 405≤N2≤432.

[0101] In this arrangement, the battery monomers 300 in the energy storage cabinet 10 are connected in N2 series and N1 parallel. In the energy storage cabinet 10, the N2 battery monomers 300 are connected in series, and the system voltage of the energy storage cabinet 10 is U2, then U2=U1*N2. The energy storage cabinet 10 is connected with the energy storage converter outside to realize the charging and discharging of the energy storage cabinet 10. To improve the adaptability of the energy storage cabinet 10 to the energy storage converter, 1000V≤U2≤1500V, then 405≤N2≤432. In this energy storage system, the power density of the energy storage system is relatively high and the adaptability to the energy storage converter outside is higher.

[0102] In a possible design, N1 is 1, that is, 1 parallel and N2 series. In this arrangement, the system voltage of the energy storage cabinet 10 can be controlled by controlling the number of battery monomers 300 in the energy storage cabinet 10, and the power density of the energy storage system is relatively high and the adaptability to the energy storage converter outside is higher.

[0103] In a possible design, all the battery cells 300 in the energy storage cabinet 10 form two parallel battery clusters 200, that is, N1 = 2; each battery cluster 200 includes N2 battery cells 300 connected in series, 405 ≤ N2 ≤ 432. In this energy storage cabinet 10, the total number of battery cells 300 in the energy storage cabinet 10 is N3, 810 ≤ N3 ≤ 864. In this arrangement, the system voltage of the energy storage cabinet 10 can be controlled by controlling the number of battery cells 300 connected in series in the energy storage cabinet 10, so as to improve the system power density of the energy storage cabinet 10. In this arrangement, the number of battery cells 300 is larger, so that the sum of the capacities of the battery cells 300 is larger.

[0104] In a possible design, the capacity of the battery cell 300 is C, 600 Ah ≤ C ≤ 1500 Ah. 600 Ah ≤ C, under the same battery capacity requirement, the number of battery cells 300 is relatively smaller, so that the number of electrical connections between the battery cells 300 is relatively smaller, and the space utilization in the cabinet is improved. C ≤ 1500 Ah, so that the working current of the battery cluster 200 formed by the battery cells 300 connected in series is smaller than the peak capacity of the wire harness and the electrical connection connected with the battery cell 300, so that the use stability of the energy storage cabinet 10 is stronger.

[0105] In a possible design, the number of battery cells 300 connected in series in the electrical cabinet 100 is N3, and the number of battery cells 300 connected in parallel is N4, 45 ≤ N3 ≤ 54, 1 ≤ N4. When N4 is 1, the N3 battery cells 300 in the electrical cabinet 100 are connected in series. When N4 is greater than 1, the battery cells 300 in the electrical cabinet 100 are divided into N4 groups, each group including N3 battery cells 300 connected in series, and the N4 groups of battery cells 300 are connected in parallel. In this arrangement, the system voltage of the energy storage cabinet 10 can be controlled by controlling the number of battery cells 300 connected in series in the energy storage cabinet 10, so as to improve the system power density of the energy storage cabinet 10.

[0106] In a possible design, as shown in FIG. 9, the energy storage cabinet 10 further includes a DC / DC converter 400, and the DC / DC converter 400 is connected with the battery cluster 200.

[0107] The DC / DC converter 400 is installed in the energy storage cabinet 10, and the DC / DC converter 400 is connected with the battery cluster 200. The DC / DC converter 400 is used to adjust the output voltage of the battery cluster 200, improve the voltage stability, improve the efficiency and safety of the battery cells 300 in the battery cluster 200 in the charging and discharging process, through relatively accurate control, the capacity of the battery cells 300 in the battery cluster 200 can be utilized to the maximum extent, and the service life of the battery cells 300 is improved.

[0108] One or more DC / DC converters 400 can be arranged in the energy storage cabinet 10. In an example, the DC / DC converter 400 is installed at the bottom inside the energy storage cabinet 10, and the electrical box 100 is installed above the DC / DC converter 400.

[0109] In some embodiments, the size of a single integrated cabinet 20 is the same as that of a standard container, and the size of two or more energy storage cabinets 10 is the same as that of an integrated cabinet 20.

[0110] A single integrated cabinet 20 can be accommodated in a standard container, and two or more energy storage cabinets 10 can be accommodated in a standard container.

[0111] The size of two or more energy storage cabinets 10 is the same as that of an integrated cabinet 20. For example, the size of two energy storage cabinets 10 can be the same as that of an integrated cabinet 20, the size of three energy storage cabinets 10 can be the same as that of an integrated cabinet 20, the size of four energy storage cabinets 10 can be the same as that of an integrated cabinet 20, and the size of five or more energy storage cabinets 10 can be the same as that of an integrated cabinet 20.

[0112] Two or more energy storage cabinets 10 can be accommodated in a standard container. For example, two energy storage cabinets 10 can be accommodated in a standard container, three energy storage cabinets 10 can be accommodated in a standard container, four energy storage cabinets 10 can be accommodated in a standard container, and five or more energy storage cabinets 10 can be accommodated in a standard container.

[0113] When the size of an integrated cabinet 20 is the same as that of a standard container, and the size of two or more energy storage cabinets 10 is the same as that of an integrated cabinet 20, a standard container can be used as the cabinet body of the integrated cabinet 20, thereby reducing the difficulty of manufacturing the integrated cabinet 20 and further reducing the production cost of the integrated cabinet 20. Since the size of two or more energy storage cabinets 10 is the same as that of an integrated cabinet 20, the size of the energy storage cabinet 10 is relatively small, thereby making the weight of a single energy storage cabinet 10 relatively small to facilitate transportation of the energy storage cabinet 10. Since the size of two or more energy storage cabinets 10 is the same as that of an integrated cabinet 20, it is convenient to arrange and install the integrated cabinet 20 and the plurality of energy storage cabinets 10, and the space utilization rate of the energy storage system 1 in a rectangular or similar rectangular site is high. For example, the width of a single energy storage cabinet 10 is equal to the width of an integrated cabinet 20, and the height of a single energy storage cabinet 10 is equal to the height of an integrated cabinet 20, and the length of two or more energy storage cabinets 10 is equal to the length of a single integrated cabinet 20.

[0114] In one possible design, the total mass of the single integrated cabinet 20 is less than or equal to 36000 kg, and the total mass of the two or more energy storage cabinets 10 is less than or equal to 36000 kg, in the case that the single integrated cabinet 20 can be accommodated in one standard container, and the two or more energy storage cabinets 10 can be accommodated in one standard container. In this arrangement, the two or more energy storage cabinets 10 and the integrated cabinet 20 can meet the standard requirements of the maximum total mass of a standard container during transportation.

[0115] In the case that the size of the single integrated cabinet 20 is the same as that of one standard container, and the size of the two or more energy storage cabinets 10 is the same as that of one integrated cabinet 20, it is beneficial for transportation, which at least includes land transportation and sea transportation. For example, during land transportation, the size of the transportation device (such as a vehicle) for transportation is usually adapted to transport a standard container, for example, in the case that the transportation device is adapted to transport one standard container. Since the size of the integrated cabinet 20 is the same as that of one standard container, the transportation device for transporting a standard container can be adapted to transport one integrated cabinet 20 and two or more energy storage cabinets 10, that is, the size of the integrated cabinet 20 and the energy storage cabinet 10 is more suitable for the transportation device, and the space utilization of the transportation device is relatively larger, which is beneficial for transportation and relatively low transportation cost.

[0116] In the case that the single integrated cabinet 20 can be accommodated in one standard container, and the two or more energy storage cabinets 10 can be accommodated in one standard container, during transportation, one integrated cabinet 20 can be placed in one standard container for transportation, and two or more energy storage cabinets 10 can be placed in one standard container for transportation. In this arrangement, the transportation device adapted to the standard container can be used to transport the integrated cabinet 20 and the energy storage cabinet 10, which is high in transportation efficiency and relatively low in cost.

[0117] In one possible design, the total mass of the single integrated cabinet 20 is less than 36000 kg, and the total mass of the standard container and the single integrated cabinet 20 is less than or equal to 36000 kg after the single integrated cabinet 20 is accommodated in the standard container, in the case that the single integrated cabinet 20 can be accommodated in one standard container, and two or more energy storage cabinets 10 can be accommodated in one standard container. The total mass of the two or more energy storage cabinets 10 is less than 36000 kg, and the total mass of the standard container and the two or more energy storage cabinets 10 is less than or equal to 36000 kg after the two or more energy storage cabinets 10 are accommodated in the standard container. In this arrangement, the two or more energy storage cabinets 10 and the single integrated cabinet 20 can meet the standard requirements for the maximum total mass of the standard container during transportation in the standard container.

[0118] In some examples, the size of the standard container can be 10 feet, 20 feet, 30 feet, 40 feet, or 45 feet, etc. The above-mentioned sizes can be defined according to the field standard requirements, for example, the size of the standard container can be the standard requirement defined by the relevant laws and regulations, departmental rules, etc. of land and / or sea transportation of various countries, for example, the energy storage cabinet 101 in the form of a container can adopt a container that meets the requirements of the People's Republic of China National Standard “GBT1413-2023 Series 1 Containers Classification, Size and Rated Mass”, and the size of the standard container includes length size, width size and height size. The size of each standard container is described as follows:

[0119] The 10 feet includes: the length size is 2991 mm, the tolerance is 0-5 mm; the width direction is 2438 mm, the tolerance is 0-5 mm; and the height direction is not greater than 2438 mm, the tolerance is 0-5 mm.

[0120] The 20 feet includes: the length size is 6058 mm, the tolerance is 0-6 mm; the width direction is 2438 mm, the tolerance is 0-5 mm; and the height direction can be 2896 mm, 2591 mm or not greater than 2438 mm, the tolerance is 0-5 mm.

[0121] The 30 feet includes: the length size is 9125 mm, the tolerance is 0-10 mm; the width direction is 2438 mm, the tolerance is 0-5 mm; and the height direction is not greater than 2438 mm, the tolerance is 0-5 mm.

[0122] The 40 feet includes: the length size is 12192 mm, the tolerance is 0-10 mm; the width direction is 2438 mm, the tolerance is 0-5 mm; and the height direction is 2896 mm, 2591 mm or not greater than 2438 mm, the tolerance is 0-5 mm.

[0123] 45 feet include: length dimension is 13716mm, tolerance is 0-10mm; width direction is 2438mm, tolerance is 0-5mm; height direction is 2591mm or 2896mm, tolerance is 0-5mm.

[0124] Exemplarily, the size of the single integrated cabinet 20 is the size of a 20 feet container, the size of the single energy storage cabinet 10 is equal to the size of a 10 feet container. The size of the two energy storage cabinets 10 is equal to the size of the single integrated cabinet 20.

[0125] In the case that the integrated cabinet 20 can be accommodated in a standard container, the integrated cabinet 20 can be placed in a standard container for transportation during transportation, which is convenient for transportation.

[0126] In this arrangement, the size of the integrated cabinet 20 is larger than that of the energy storage cabinet 10, which is convenient for arranging relatively more structures to control more energy storage cabinets 10, and the size of the energy storage cabinet 10 is smaller than that of the integrated cabinet 20, so that the weight of the single energy storage cabinet 10 is relatively lighter, which is easy to transport.

[0127] As shown in Table 1, Table 1 is the influence of the change of 1mm in length, width and height of a standard 20 feet container on the container volume utilization rate and the weight.

[0128] Table 1:

[0129] As shown in Table 1, the change of 1mm in length of the container has the smallest influence on the volume of the container, and the change of 1mm in width and height of the container has relatively large influence on the volume of the container. Therefore, a standard container different from the 20 feet container in the length direction can be selected, such as a 15 feet container, a 10 feet container or a container smaller than 10 feet. Since the space utilization rate of the container smaller than 10 feet is low, the energy storage cabinet 10 provided in the embodiment of the present application can adopt a 10 feet container. Since the standard 10 feet container is a standard part, the production cost is relatively low. In the case of using a 10 feet container as the energy storage cabinet 10, the volume of the energy storage cabinet 10 is relatively small, and the weight is relatively small, which is suitable for more kinds of transportation requirements, and the whole can be transported without disassembling, so that the on-site loading and unloading efficiency can be improved.

[0130] In an embodiment of the present application, as shown in FIG. 2, the energy storage cabinet 10 is a standard ten-foot container, the length L1 of the energy storage cabinet 10 is 2991 mm, the width W1 of the energy storage cabinet 10 is 2438 mm, and the height H1 of the energy storage cabinet 10 is 2896 mm. As shown in FIG. 10, the integrated cabinet 20 is a standard twenty-foot container, the length L5 of the integrated cabinet 20 is 6058 mm (20 feet), the width W5 of the integrated cabinet 20 is 2483 mm, and the height H5 of the integrated cabinet 20 is 2896 mm. As shown in FIG. 11, one integrated cabinet 20 is adapted to connect and control multiple energy storage cabinets 10. In FIG. 11, one integrated cabinet 20 is used to control eight energy storage cabinets 10. As shown in FIG. 9, there are 16 electric boxes 100 in the energy storage cabinet 10. As shown in FIG. 5, the length L2 of the electric box 100 is 1292 mm, the width W2 of the electric box 100 is 2157 mm, and the height H2 of the electric box 100 is 306 mm. As shown in FIG. 3, there are 104 battery monomers 300 in the electric box 100, as shown in FIG. 7, the length L3 of the battery monomer 300 is 307 mm, the width W3 of the battery monomer 300 is 70 mm, and the height H3 of the battery monomer 300 is 260 mm. The capacity of the battery monomer 300 is 706 Ah, and the series-parallel connection mode of the 104 battery monomers 300 is 2P52S (2 parallel 52 series). For example, the 104 battery monomers 300 in the electric box 100 are divided into two groups, 52 in each group, the 52 battery monomers 300 in the same group are connected in series, and are connected in parallel with the 52 battery monomers 300 in series in the other group. The series-parallel connection mode of all the battery monomers 300 in the energy storage cabinet 10 is 2P2P416S (2 parallel 2 parallel 416 series). For example, the 16 electric boxes 100 are divided into two columns, 8 electric boxes 100 in one column, and the 8 electric boxes 100 in the same column have a total of 832 battery monomers 300, which are connected in parallel in two groups, 416 battery monomers 300 in each group are connected in series. The 832 battery monomers 300 in 2 parallel 416 series in one set of 8 electric boxes 100 are connected in parallel with the 832 battery monomers 300 in 2 parallel 416 series in the other set. The energy storage cabinet 10 has a fluid pipe interface, and the energy storage cabinet 10 is provided with a water cooling structure. In the electric box 100, the electrode terminal 320 of the battery monomer 300 is located at the top of the battery monomer 300, the water cooling structure includes a water cooling plate and a water cooling pipe, the water cooling plate is arranged at the bottom of the electric box 100, the water cooling plate is provided with a liquid flow channel, the liquid flow channel is communicated with the water cooling pipe, the water cooling pipe is communicated with the fluid pipe interface, the fluid pipe interface is connected with the thermal management unit interface of the integrated cabinet 20, so that the cooling liquid is introduced into the water cooling pipe through the thermal management unit 530 in the integrated cabinet 20, the cooling liquid enters the liquid flow channel through the water cooling pipe, and the cooling liquid is used for heat dissipation for the battery monomer 300. In the integrated cabinet 20, the high-voltage unit 510 includes a master control box, and the master control box at least includes one component or multiple components of a direct current bus, a direct current disconnector, a high-voltage relay, a protection fuse, and a current sensor.The low-voltage unit 520 includes a low-voltage power distribution module and a control component part, the low-voltage power distribution module at least includes one or more of a molded case circuit breaker, a miniature circuit breaker, a 24V power module, a UPS backup power, and an emergency stop button component. The control component part at least includes one or more of a main battery management unit, a fire control module, an Ethernet unit, a fiber conversion module, an energy storage inverter controller, and an energy management module. The thermal management unit 530 includes a water cooling unit. The energy storage system 1 further includes a battery management module, high-voltage electrical components in the battery management module belong to the high-voltage unit 510, and low-voltage electrical components belong to the low-voltage unit 520. The energy storage system 1 further includes and, and can adopt an external installation mode or an internal installation mode, the internal installation mode is installed in the integrated cabinet 20, and the external installation mode is installed outside the energy storage cabinet 10 and the integrated cabinet 20. When the internal installation mode is adopted, and belong to a part of the high-voltage unit 510.

[0131] The energy storage cabinet 10 is applied to the energy storage system 1 provided by any one of the above embodiments, and includes a first high-voltage interface 11, a first low-voltage interface 12, and a fluid pipeline interface 13. The energy storage cabinet 10 contains a plurality of electric boxes 100, the electric boxes 100 contain battery monomers 300, the volume of the energy storage cabinet 10 is V1, the total volume of the plurality of electric boxes 100 is V2, and 0.5≤V2 / V1.

[0132] The first high-voltage interface 11 of the energy storage cabinet 10 is used to be connected with the second high-voltage interface 21 of the integrated cabinet 20, the first low-voltage interface 12 of the energy storage cabinet 10 is used to be connected with the second low-voltage interface 22 of the integrated cabinet 20, and the fluid pipeline interface 13 of the energy storage cabinet 10 is used to be connected with the thermal management unit interface 23 of the integrated cabinet 20. The energy storage cabinet 10 does not set the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530, the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530 are arranged in the integrated cabinet 20, and are connected through the first high-voltage interface 11 and the second high-voltage interface 21, the first low-voltage interface 12 and the second low-voltage interface 22, and the fluid pipeline interface 13 and the thermal management unit interface 23, so that the energy storage cabinet 10 is connected with the high-voltage unit 510, the low-voltage unit 520, and the thermal management unit 530 in the integrated cabinet 20, to control the energy storage cabinet 10 through the high-voltage unit 510, control the energy storage cabinet 10 through the low-voltage unit 520, and control the energy storage cabinet 10 through the thermal management unit 530, for example, cooling the energy storage cabinet 10.

[0133] In an embodiment of the present application, the energy storage cabinet 10 is a standard ten-foot container, the length L1 of the energy storage cabinet 10 is 2991 mm, the width W1 of the energy storage cabinet 10 is 2438 mm, and the height H1 of the energy storage cabinet 10 is 2896 mm. There are 16 electric boxes 100 in the energy storage cabinet 10, the length of the electric box 100 is 1292 mm, the width of the electric box 100 is 2157 mm, and the height of the electric box 100 is 306 mm. There are 104 battery monomers 300 in the electric box 100, the length of the battery monomer 300 is 307 mm, the width of the battery monomer 300 is 70 mm, and the height of the battery monomer 300 is 260 mm. The capacity of the battery monomer 300 is 706 Ah, and the series-parallel connection mode of the 104 battery monomers 300 is 2P52S (2 parallel 52 series). Exemplarily, the 104 battery monomers 300 in the electric box 100 are divided into two groups, each group has 52 battery monomers 300, the 52 battery monomers 300 in the same group are connected in series, and are connected in parallel with the 52 battery monomers 300 connected in series in the other group. The series-parallel connection mode of all the battery monomers 300 in the energy storage cabinet 10 is 2P2P416S (2 parallel 2 parallel 416 series). Exemplarily, the 16 electric boxes 100 are divided into two parts, 8 electric boxes 100 in one part, and the 8 electric boxes 100 in the same part have a total of 832 battery monomers 300, which are connected in parallel in two groups, each group has 416 battery monomers 300 connected in series. The 832 battery monomers 300 connected in 2 parallel 416 series in the 8 electric boxes 100 in one part are connected in parallel with the 832 battery monomers 300 connected in 2 parallel 416 series in the 8 electric boxes 100 in the other part. The energy storage cabinet 10 has a pipe interface, and a water cooling structure is arranged in the energy storage cabinet 10. In the electric box 100, the electrode terminal 320 of the battery monomer 300 is located at the top of the battery monomer 300, the water cooling structure includes a water cooling plate and a water cooling pipe, the water cooling plate is arranged at the bottom of the electric box 100, the water cooling plate is provided with a liquid flow channel, the liquid flow channel is in communication with the water cooling pipe, the water cooling pipe is in communication with the pipe interface, the pipe interface is connected with a thermal management unit, the thermal management unit is used for introducing cooling liquid into the water cooling pipe through the pipe interface, the cooling liquid enters the liquid flow channel through the water cooling pipe to dissipate heat for the battery monomer 300. The thermal management unit can include a pumping device.

[0134] In another embodiment of the present application, the length L1 of the energy storage cabinet 10 is 2991 mm, the width W1 of the energy storage cabinet 10 is 2438 mm, and the height H1 of the energy storage cabinet 10 is 2896 mm. There are 16 electric boxes 100 in the energy storage cabinet 10, the length of the electric box 100 is 1292 mm, the width of the electric box 100 is 2157 mm, and the height of the electric box 100 is 306 mm. There are 52 battery monomers 300 in the electric box 100, the length of the battery monomer 300 is 307 mm, the width of the battery monomer 300 is 140 mm, and the height of the battery monomer 300 is 260 mm. The capacity of the battery monomer 300 is 1421 Ah, and the series-parallel connection mode of the 104 battery monomers 300 is 1P52S (1 parallel 52 series), that is, 52 battery monomers 300 are connected in series. The series-parallel connection mode of all battery monomers 300 in the energy storage cabinet 10 is 2P1P416S (2 parallel 1 parallel 416 series), for example, 16 electric boxes 100 are divided into two groups, 8 electric boxes 100 in each group, and 416 battery monomers 300 in the same group are connected in series and connected in parallel with 416 battery monomers 300 in the other group.

[0135] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage system, wherein, include: At least one energy storage cabinet, the energy storage cabinet including a first high-pressure interface, a first low-pressure interface and a fluid pipeline interface; The energy storage cabinet contains multiple electrical boxes, and each electrical box contains a single battery cell. The volume of the energy storage cabinet is V1, and the total volume of the multiple electrical boxes is V2, where 0.5 ≤ V2 / V1. An integrated cabinet is provided, which includes a high-voltage unit, a low-voltage unit, and a thermal management unit. The integrated cabinet includes a second high-voltage interface, a second low-voltage interface, and a thermal management unit interface. One integrated cabinet is correspondingly arranged with at least one energy storage cabinet. The second high-voltage interface of the integrated cabinet is connected to the first high-voltage interface of at least one energy storage cabinet. The second low-voltage interface of the integrated cabinet is connected to the first low-voltage interface of at least one energy storage cabinet. The thermal management unit interface of the integrated cabinet is connected to the fluid pipeline interface of at least one energy storage cabinet.

2. The energy storage system as described in claim 1, wherein, V2 / V1≤0.

8.

3. The energy storage system as described in claim 2, wherein, 0.6≤V2 / V1≤0.

7.

4. The energy storage system according to any one of claims 1 to 3, wherein, The energy storage cabinet includes N1 parallel battery clusters, and each battery cluster includes N2 battery cells connected in series, where 1≤N1, 405≤N2≤432.

5. The energy storage system as described in claim 4, wherein, The electrical box contains multiple battery cells, each with a volume of V3, where 0.006 ≤ V3 / V2.

6. The energy storage system as described in claim 5, wherein, V3 / V2≤0.

016.

7. The energy storage system as described in claim 4, wherein, The energy storage cabinet also includes a DC / DC converter, which is connected to the battery cluster.

8. The energy storage system according to any one of claims 1 to 7, wherein, The capacity of a single battery cell is C, where 600Ah ≤ C ≤ 1500Ah.

9. The energy storage system according to any one of claims 1 to 8, wherein, The dimensions of a single integrated cabinet are the same as those of a standard shipping container, and the dimensions of two or more energy storage cabinets are the same as those of a single integrated cabinet; or, A single integrated cabinet can be accommodated in a standard container, and two or more of the energy storage cabinets can be accommodated in a standard container.

10. An energy storage cabinet, wherein, Includes a first high-pressure interface, a first low-pressure interface, and a fluid pipeline interface; The energy storage cabinet contains multiple electrical boxes, and each electrical box contains a single battery cell. The volume of the energy storage cabinet is V1, and the total volume of the multiple electrical boxes is V2, where 0.5 ≤ V2 / V1.

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