Battery apparatus, battery cabinet, and energy storage system

Abstract

The present present application provides a battery apparatus, a battery cabinet, and an energy storage system. The battery apparatus (100) comprises at least two battery cell units (210), wherein each battery cell unit (210) comprises a single battery cell (211); and support members (131), wherein the support members (131) are fixedly connected to the battery cell units (210), and the respective support members (131) corresponding to two adjacent battery cell units (210) abut against each other to achieve stacking of said battery cell units (210).

Description

Battery devices, battery cabinets and energy storage systems

[0001] This application claims priority to Chinese Patent Application No. 202411999981.5, filed with the Chinese Patent Office on December 31, 2024, entitled "Battery Device, Battery Cabinet and Energy Storage System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery device, battery cabinet and energy storage system. Background Technology

[0003] With the rapid development of renewable energy and the increasing global demand for clean energy, energy storage systems are playing an increasingly important role in modern power systems. Energy storage systems can not only balance electricity supply and demand, but also improve the stability and reliability of the power grid.

[0004] Existing energy storage systems are generally structured as multi-layer battery cell stacks. However, due to the poor overall structural stability when multiple battery cell stacks are used, the lower-layer battery cell may be damaged by pressure. Summary of the Invention

[0005] In view of the above problems, this application provides a battery device, battery cabinet and energy storage system, which uses supporting components to bear the weight of the battery cell units, which helps to improve the overall structural stability and avoid damage caused by mutual squeezing between battery cell units.

[0006] In a first aspect, this application provides a battery device, comprising: at least two battery cell units, each battery cell unit including a single battery cell; and a support member, the support member being fixedly connected to the battery cell unit, wherein two adjacent battery cell units are stacked by abutting against each other through the corresponding support member.

[0007] In some embodiments, the battery device further includes: a limiting plate disposed on both sides of the cell unit along a first direction, and a supporting member disposed on the side of the limiting plate opposite to the cell unit, or the supporting member disposed on the side of the limiting plate facing the cell unit.

[0008] In some embodiments, the support member is disposed between the individual battery cells.

[0009] In some embodiments, the supporting member includes at least one of I-beams, channel steel, angle steel, and round steel.

[0010] In some embodiments, the support member includes: a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being disposed opposite each other along the height direction, the first connecting portion and the second connecting portion being disposed beyond the limiting plate, the at least two battery cell units including a first battery cell unit and a second battery cell unit, the first battery cell unit and the second battery cell unit being adjacent to each other, the first connecting portion of the support member fixed to the first battery cell unit and the second connecting portion of the support member fixed to the second battery cell unit abutting against each other.

[0011] In some embodiments, the support member further includes a transition connection located between the first connection portion and the second connection portion.

[0012] In some embodiments, one of the first connecting portion and the second connecting portion is provided with a limiting structure, and the other is provided with a limiting engagement structure adapted to the limiting structure. When the first battery cell unit and the second battery cell unit are stacked, the limiting structure of the support member fixed to the first battery cell unit and the limiting engagement structure of the support member fixed to the second battery cell unit support each other and engage with each other.

[0013] In some embodiments, the limiting fit structure forms a limiting groove.

[0014] In some embodiments, the first connecting portion includes a body segment and two limiting protrusions. The limiting protrusions are located on the side of the body segment opposite to the second connecting portion. The two limiting protrusions are respectively located on the body segment and spaced apart along a second direction, and together with the body segment, define the limiting groove. The width of the second connecting portion along the second direction is less than or equal to the width of the limiting groove.

[0015] In some embodiments, the body segment and the transition connection portion are perpendicular to each other.

[0016] In some embodiments, the width of the limiting groove is 130mm-140mm, or the width of the second connecting portion is 125mm-135mm.

[0017] In some embodiments, the transition connection portion is provided with a first connection hole, the limiting plate is provided with a first connection mating hole, and the support member and the limiting plate are connected by a first fastener passing through the first connection hole and the first connection mating hole in sequence.

[0018] In some embodiments, the body segment is provided with a second connecting hole that extends through the height direction, and the second connecting part is provided with a second connecting mating hole opposite to the second connecting hole. When the first battery cell unit and the second battery cell unit are stacked, the two support members are connected by a second fastener passing through the second connecting hole of the support member fixed to the first battery cell unit and the second connecting mating hole of the support member fixed to the second battery cell unit.

[0019] In some embodiments, the support member is further provided with a positioning hole that extends through the height direction. When the first battery cell unit and the second battery cell unit are stacked, the two support members are positioned by positioning pins passing through the positioning holes of the support member fixed to the first battery cell unit and the support member fixed to the second battery cell unit in sequence.

[0020] In some embodiments, the battery device further includes a connecting strip, the two ends of which are respectively connected to the first connecting portions of the two support members.

[0021] In some embodiments, the limiting protrusion is provided with a first through hole extending along the first direction, and the connecting strip passes through the first through hole.

[0022] In some embodiments, the connecting strip is provided with limiting protrusions at both ends, and the limiting protrusions abut against the supporting member.

[0023] In some embodiments, the surface of the connecting strip is provided with a first insulating layer.

[0024] In some embodiments, the battery device further includes a bottom beam, the two ends of which are respectively connected to the second connecting portions of the two supporting members.

[0025] In some embodiments, the bottom beam includes: a beam body and connecting ribs, wherein the beam bodies are a plurality of beam bodies arranged at intervals along the first direction, the connecting ribs penetrate the plurality of beam bodies, and both ends of the connecting ribs are respectively connected to the second connecting portions of two supporting members, and the battery cell unit is supported on the beam body.

[0026] In some embodiments, the second connecting portion is provided with a second through hole extending along the first direction, and the two ends of the connecting rib are respectively inserted through the second through holes of the two supporting members.

[0027] In some embodiments, the bottom beams are a plurality of beams arranged parallel to and spaced apart along a second direction. When the plurality of battery cells are stacked, a heat exchange channel is defined between two adjacent bottom beams of the upper battery cell in two adjacent battery cells. The heat exchange channel is connected to the outside. A connecting channel connecting two adjacent heat exchange channels is provided on the beam body.

[0028] In some embodiments, there are multiple heat exchange channels, each including an air inlet channel and an air outlet channel, which are connected by a connecting channel.

[0029] In some embodiments, the air inlet channels are distributed on both sides of the air outlet channels along the second direction, and each air inlet channel is provided with an air inlet at both ends along the first direction; the air outlet channels are provided with air outlets at both ends along the first direction.

[0030] In some embodiments, the beam body comprises bakelite board or epoxy resin-glass fiber composite.

[0031] In some embodiments, the connecting ribs of the bottom beam are steel structural components.

[0032] In some embodiments, the limiting plate has a wire harness groove on one side edge along a third direction, the wire harness groove extends along a second direction, and a fixing hole is provided on the groove wall of the wire harness groove for a wire harness fixing member to pass through.

[0033] In some embodiments, the battery device further includes a control device disposed on the side of the limiting plate opposite to the battery cell.

[0034] In some embodiments, the battery device further includes a housing that covers the periphery of the limiting plate and together with the limiting plate forms a closed space.

[0035] Secondly, this application also provides a battery cabinet, including a cabinet body and the aforementioned battery device.

[0036] Thirdly, this application also provides an energy storage system, including the aforementioned battery cabinet or the aforementioned battery device.

[0037] In the battery device of this application, the individual cells of the cell unit are fixed by support members, and two adjacent cell units are stacked by abutting each other through corresponding support members. In this way, after stacking, the weight of the upper cell unit is transferred to the support member of the lower cell unit through the corresponding support member. This can prevent the individual cells of two adjacent cell units from being squeezed and damaged, which is beneficial to improving the installation stability and reliability of the battery device and enabling the battery device to work better. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 is a schematic diagram of the structure of a battery device with multiple battery cell units according to an embodiment of this application;

[0040] Figure 2 is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0041] Figure 3 is a schematic diagram of the structure of a battery device according to another embodiment of this application;

[0042] Figure 4 is a schematic diagram of the structure of the limiting plate according to an embodiment of this application;

[0043] Figure 5 is an exploded structural diagram of the cooperation between the support member and the limiting plate in an embodiment of this application;

[0044] Figure 6 is a structural schematic diagram of the support member according to an embodiment of this application;

[0045] Figure 7 is a schematic diagram of the connection and cooperation between two support members in an embodiment of this application;

[0046] Figure 8 is a structural schematic diagram of the battery device according to an embodiment of this application from one angle;

[0047] Figure 9 is a structural schematic diagram of the battery device according to an embodiment of this application from another angle;

[0048] Figure 10 is a schematic diagram of the bottom beam in an embodiment of this application;

[0049] Figure 11 is a structural schematic diagram of the beam body of the bottom beam according to an embodiment of this application;

[0050] Figure 12 is a schematic diagram of the heat exchange channel at the bottom of the upper battery device as viewed from below in an embodiment of this application.

[0051] Figure 13 is a schematic diagram of the structure of the connecting strip according to an embodiment of this application.

[0052] Explanation of reference numerals in the attached drawings: 100-Battery assembly; 110-Limiting plate; 111-First connecting hole; 112-Wire harness groove; 113-Fixing hole; 120-Bottom beam; 121-Beam body; 122-Connecting rib; 123-Connecting channel; 130-Frame assembly; 131-Supporting member; 1311-First connecting part; 1311a-Body section; 1311b-Limiting protrusion; 1311c-First through hole; 1311d-Second connecting hole; 1312-Second connecting part; 1312a-Second connecting hole; 1312b-Second through hole; 1313-Transition connecting part; 1313a-First connecting hole; 1314-Limiting groove; 1315-Positioning hole; 132-Connecting strip; 1321-Limiting protrusion ring; 133-First fastener; 134-Second fastener; 140 - Heat exchange channel; 141 - Air inlet channel; 1411 - Air inlet; 142 - Air outlet channel; 1421 - Air outlet; 150 - Housing; 210 - Battery cell unit; 211 - Individual battery cell. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0054] With the rapid development of renewable energy and the increasing global demand for clean energy, energy storage systems are playing an increasingly important role in modern power systems. Energy storage systems can not only balance power supply and demand but also improve the stability and reliability of the power grid. Existing energy storage systems generally consist of multi-layered stacked battery cell units. However, due to the poor overall structural stability of multi-layered stacked battery cell units, lower-layer battery cell units may be damaged under pressure.

[0055] In view of this, this application provides a battery device, a battery cabinet, and an energy storage system. By supporting the weight of the battery cell unit with a supporting member, multi-layer battery cell units can be stacked, and the stacked battery cells can be prevented from being squeezed and damaged by each other, which is beneficial to improving the reliability of the battery device.

[0056] The battery device 100 provided in the embodiments of this application will be described in detail below with reference to Figures 1 to 13.

[0057] In the embodiments of this application, referring to FIG1, X is the first direction, Y is the second direction, and Z is the third direction.

[0058] Referring to Figures 1 and 2, this embodiment provides a battery device 100, including at least two cell units 210. Each cell unit 210 may include multiple individual cells 211. The individual cells 211 are arranged side by side along a first direction. Aerogel and PU foam are disposed between the individual cells 211 for heat insulation and to buffer the expansion of the cells.

[0059] The battery device 100 may include support members 131, which are fixedly connected to the cell unit 210. For example, the support members 131 may be located at both ends of the cell unit 210, so that the individual cell 211 of the cell unit 210 is clamped together by the two support members 131, thereby fixing the individual cell 211. In this case, each cell unit 210 has two corresponding support members 131.

[0060] Two adjacent battery cells 210 are stacked by abutting against each other through corresponding support members 131. For example, two adjacent battery cells 210 are respectively a first battery cell and a second battery cell. When the first battery cell and the second battery cell are stacked, the first battery cell can be located on top of the second battery cell. At this time, the support members 131 corresponding to the first battery cell and the support members 131 corresponding to the second battery cell are stacked and in contact with each other. In this way, the weight of the first battery cell can be transferred to the support members 131 corresponding to the first battery cell through the support members 131 corresponding to the first battery cell, and finally transferred to the mounting surface of the battery device 100 (e.g., the bottom wall of the cabinet cavity), thereby preventing the weight of the first battery cell from being applied to the individual cells 211 of the second battery cell, and thus preventing the individual cells 211 of the lower battery cell 210 from being squeezed and damaged.

[0061] In the battery device 100 of this application embodiment, each individual cell 211 of the cell unit 210 is fixed by a support member 131, and two adjacent cell units 210 are stacked by abutting each other through the corresponding support members 131. In this way, after stacking, the weight of the upper cell unit 210 is transferred to the support member 131 of the lower cell unit 210 through the corresponding support member 131. This can prevent the individual cells 211 of two adjacent cell units 210 from being squeezed and damaged, which is beneficial to improving the installation stability and reliability of the battery device 100 and enabling the battery device 100 to work better.

[0062] Optionally, the battery device 100 may further include: limiting plates 110. The limiting plates 110 are disposed on both sides of the cell unit 210 along the first direction. The limiting plates 110 serve as end plates of the cell unit 210. The two limiting plates 110 can jointly clamp the cell unit 210 to limit the movement of multiple individual cells 211 within the cell unit 210, preventing the thermal expansion of each individual cell 211 from affecting the overall positional layout. It can be understood that each cell unit 210 may be provided with two limiting plates 110, respectively located on both sides of the cell unit 210 along the first direction.

[0063] In other words, the support member 131 in this embodiment is a load-bearing component independent of the limiting plate 110. The support member 131 can be fixedly installed on the side of the limiting plate 110 facing away from the cell unit 210, which is beneficial for the limiting plate 110 and the single cell 211 to fit better. Alternatively, the support member 131 can also be fixedly installed on the side of the limiting plate 110 facing the cell unit 210, thus providing more installation methods.

[0064] Alternatively, in other possible embodiments, each cell unit 210 includes multiple individual cells 211 arranged side-by-side, for example, multiple individual cells 211 arranged side-by-side along a first direction. In this case, the support member 131 can be disposed between the individual cells 211. The support member 131 can be a structure surrounding the individual cells 211 to facilitate direct connection between two support members 131, or the support members 131 can also be connected through other intermediate connection structures. Thus, the support member 131 has more assembly methods and can meet the usage requirements under different working conditions.

[0065] In some embodiments, the support member 131 may include at least one of I-beams, channel steel, angle steel, and round steel. That is, the support member 131 may be manufactured from at least one of I-beams, channel steel, angle steel, and round steel.

[0066] For example, when the support member 131 is made of I-beam, its cross-section is I-shaped, allowing for stacking using the two transverse sections of the I-beam; when the support member 131 is made of channel steel, it has a groove structure that can accommodate another support member 131, thus achieving stacking; when the support member 131 is made of angle steel, it can be made of at least two angle steels, allowing for stable stacking using the corners; when the support member 131 is made of round steel, its supporting surface is arc-shaped, which facilitates stable stacking of two support members 131. Thus, the support member 131 has diverse construction options and sufficient structural strength.

[0067] In some embodiments, the support member 131 has a first connecting portion 1311 and a second connecting portion 1312 that are opposite each other in the height direction (i.e., in the third direction). The first connecting portion 1311 and the second connecting portion 1312 are disposed beyond the limiting plate 110. For example, the first connecting portion 1311 extends upward beyond the top end of the limiting plate 110, and the second connecting portion 1312 extends downward beyond the bottom end of the limiting plate 110.

[0068] In this way, when the first and second battery cells are stacked along the height direction, the first connecting part 1311 of the support member 131 fixed to the first battery cell and the second connecting part 1312 of the support member 131 fixed to the second battery cell abut against each other, and it can be ensured that there is no contact between the limiting plate 110 fixed to the first battery cell and the limiting plate 110 fixed to the second battery cell. In this way, the limiting plates 110 of the upper and lower adjacent battery devices 100 can maintain a certain distance, so that the weight of the stacked energy storage system is mainly borne by the support member 131 instead of the limiting plate 110. It can be ensured that the limiting plates 110 of the two adjacent battery cells 210 are almost unloaded, which can avoid the deformation of the limiting plate 110, reduce the strength requirements of the limiting plate 110, and enable the limiting plate 110 to better limit and fix the individual battery cells 211 of the battery cell 210, thereby improving the strength and reliability of the battery device 100. The specific structure and materials of the support member 131 in this embodiment can be selected according to actual needs, so that it has sufficient structural strength to bear a large weight.

[0069] Referring to Figures 1, 3, 5, and 6, in some embodiments, the support member 131 may further include a transition connection portion 1313, which is located between the first connection portion 1311 and the second connection portion 1312. For example, the support member 131 may be generally formed in the shape of an I-beam, that is, the support member 131 may be made of an I-beam. The transition connection portion 1313 enables the support member 131 to have a certain height so that the first connection portion 1311 and the second connection portion 1312 extend beyond the upper and lower ends of the limiting plate 110, respectively. At the same time, it can realize the vertical transmission of force between the first connection portion 1311 and the second connection portion 1312.

[0070] In some embodiments, the transition connection 1313 is fixedly connected to the limiting plate 110. For example, the transition connection 1313 may be welded to the limiting plate 110, or the transition connection 1313 and the limiting plate 110 may be fixedly connected by the first fastener 133 described below. By fixing the transition connection 1313 to the limiting plate 110, the support member 131 is fixedly connected to the limiting plate 110, which helps to evenly distribute the gravitational force of the battery cell 210 on the battery device 100 onto the support member 131, thereby improving the stability of the structure.

[0071] Referring again to Figures 5 and 6, in some embodiments, the transition connection portion 1313 is provided with a first connecting hole 1313a, and the limiting plate 110 is provided with a first connecting mating hole 111. The first fastener 133 passes through the first connecting hole 1313a and the first connecting mating hole 111 in sequence, thereby connecting the support member 131 and the limiting plate 110. This simple structure makes the fixed connection between the support member 131 and the limiting plate 110 simple and easy to implement. Furthermore, when maintenance or replacement of the support member 131 or the limiting plate 110 is required, only the first fastener 133 needs to be removed, making maintenance and replacement operations convenient.

[0072] Optionally, the first fastener 133 can be a screw or a bolt, which helps to reduce the production cost of the battery device 100.

[0073] Referring to Figures 6, 7, 8, and 9, in some embodiments, one of the first connecting portion 1311 and the second connecting portion 1312 is provided with a limiting structure, and the other is provided with a limiting engagement structure adapted to the limiting structure. For example, the first connecting portion 1311 is provided with a limiting structure, and the second connecting portion 1312 is provided with a limiting engagement structure, or the second connecting portion 1312 constitutes a limiting structure, and the first connecting portion 1311 is provided with a limiting engagement structure.

[0074] When the first and second battery cell units are stacked, the limiting structure of the support member 131 fixed to the first battery cell unit and the limiting engagement structure of the support member 131 fixed to the second battery cell unit support and limit each other. This allows the battery cell units 210 to be stacked along a third direction. When the battery cell units 210 are stacked, the limiting plates 110 of the two battery cell units 210 do not contact each other, but are supported by the support member 131. This reduces the force on the limiting plate 110 of the lower battery cell unit 210, thereby improving the structural strength of the battery cell units 210 during stacking and extending their service life.

[0075] Referring to Figures 6 and 7, in some embodiments, the limiting structure forms a limiting groove 1314. Thus, when the multilayer battery device 100 is stacked, it is only necessary to align the limiting structure with the limiting groove 1314 for installation, making the stacking operation of the multilayer battery device 100 convenient. The limiting groove 1314 can be formed on the first connecting portion 1311, in which case the second connecting portion 1312 constitutes the limiting structure; alternatively, the limiting groove 1314 can be formed on the second connecting portion 1312, in which case the first connecting portion 1311 constitutes the limiting structure.

[0076] Referring to Figures 6 and 7, in some embodiments, the first connecting portion 1311 may include a body segment 1311a and two limiting protrusions 1311b. The body segment 1311a is perpendicular to the transition connecting portion 1313, or the body segment 1311a and the transition connecting portion 1313 may have a certain angle.

[0077] The limiting protrusion 1311b is located on the side of the body segment 1311a away from the second connecting portion 1312. The two limiting protrusions 1311b are spaced apart on the body segment 1311a along the second direction and together with the body segment 1311a define the limiting groove 1314. For example, the two limiting protrusions 1311b are located at both ends of the body segment 1311a along the second direction, that is, the two limiting protrusions 1311b and the side of the body segment 1311a away from the transition connecting section form the limiting groove 1314.

[0078] The width of the second connecting portion 1312 along the second direction is less than or equal to the width of the limiting groove 1314, preventing relative movement between the second connecting portion 1312 and the limiting groove 1314 in the second direction when they mate, thus improving the limiting fit accuracy. In this way, the matching arrangement of the second connecting portion 1312 and the limiting groove 1314 prevents misalignment of the multilayer battery cell units 210 during assembly. Simply align the second connecting portion 1312 of the upper battery cell unit 210 with the limiting groove 1314 of the first connecting portion 1311 of the lower battery cell unit 210 for installation, thus aligning the battery cell units 210 with each other. This helps reduce the installation difficulty of the multilayer battery cell unit 210 and improves the stability of its installation.

[0079] Optionally, in other embodiments, the limiting structure and the limiting mating structure can both be U-shaped slots, located in the first connecting part 1311 and the second connecting part 1312 respectively. That is, the support member 131 can be made of channel steel. When the two battery cell units 210 are stacked, the side arm of one U-shaped slot is inserted into the other U-shaped slot. The side arm of the U-shaped slot is provided with a connecting hole. The connector passes through the two connecting holes to fix the two support members 131.

[0080] Alternatively, in other embodiments, the limiting structure and the limiting mating structure form a parallel inverted V-shaped structure, that is, the support member 131 can be made of angle steel, and the two inverted V-shaped structures constitute the first connecting part 1311 and the second connecting part 1312 of the support member. The V-shaped side of the inverted V-shaped structure is provided with a connecting hole along the third direction. When the two battery cell units 210 are stacked, the inverted V-shaped structures of the two support members are stacked, and the connector passes through the two connecting holes to fix the two support members 131.

[0081] In some embodiments, the width of the limiting groove 1314 is 130mm-140mm. For example, the width of the limiting groove 1314 can be 130mm, 132mm, 134mm, 135mm, 138mm, or 140mm. Of course, this application does not limit this, and the width of the limiting groove 1314 can be reasonably selected within the above range according to actual needs. Correspondingly, the width of the second connecting portion 1312 is 125mm-135mm. For example, the width of the second connecting portion 1312 can be 125mm, 127mm, 129mm, 130mm, 132mm, 134mm, or 135mm. Of course, this application does not limit this, and the width of the second connecting portion 1312 can be reasonably selected within the above range according to actual needs.

[0082] In this way, on the one hand, the support structure 131 can have sufficient size to maintain a certain structural strength so as to achieve stable stacking of the battery cell units 210. On the other hand, the first connecting part 1311 of the support member 131 fixed to the first battery cell unit and the second connecting part 131 of the support member 131 fixed to the second battery cell unit can better achieve limiting cooperation. Furthermore, both have a certain assembly allowance, which facilitates assembly.

[0083] Referring to Figures 2, 3, and 7, in some embodiments, the limiting protrusion 1311b is provided with a first through hole 1311c extending along a first direction, and the connecting strip 132 passes through the first through hole 1311c. Thus, both ends of the connecting strip 132 are connected to the limiting protrusion 1311b on the support members 131 on both sides of the battery cell unit 210. When the weight of the battery cell unit 210 is transmitted through the bottom beam 120 to the second connecting portions 1312 of the support members 131 of the battery cell units 210 on both sides, the connecting strip 132 applies a tensile force to the first connecting portions 1311 of the two opposing support members 131, making the force on the support members 131 more uniform, thereby improving the stability of the structure.

[0084] Referring to Figures 6 and 7, in some embodiments, the body segment 1311a has a second connecting hole 1311d extending along the height direction, and the second connecting portion 1312 has a second connecting mating hole 1312a opposite to the second connecting hole 1311d. When two adjacent battery cell units 210 (i.e., the first battery cell unit and the second battery cell unit) are stacked, the two support members 131 are connected by a second fastener 134 passing through the second connecting hole 1311d of the support member 131 fixed to the first battery cell unit and the second connecting mating hole 1312a of the support member 131 fixed to the second battery cell unit. This simplifies the installation operation when assembling multiple battery cell units 210 in a stacked manner, thus improving production efficiency.

[0085] Understandably, in other embodiments of this application, the support member 131 may not have a limiting structure and a limiting engagement structure. That is, the surfaces of the first connecting part 1311 and the second connecting part 1312 are flush. When the two battery cells 210 are stacked, the first connecting part 1311 and the second connecting part 1312 are directly aligned through the second connecting hole 1311d of one battery cell 210 and the second connecting engagement hole 1312a of the other battery cell 210. The second fastener 134 passes through the second connecting hole 1311d and the second connecting engagement hole 1312a to fix the two battery cells 210 together.

[0086] Alternatively, the second fastener 134 can be a screw or a bolt, which helps to reduce the production cost of the battery cell 210.

[0087] Referring to Figures 6 and 7, in some embodiments, the support member 131 is further provided with a positioning hole 1315 extending along the height direction. When two battery cells 210 are stacked, and two adjacent battery cells 210 are stacked through the support member 131, the two support members 131 are positioned by positioning pins passing sequentially through the positioning holes 1315 of the support member 131 fixed to the first battery cell and the support member 131 fixed to the second battery cell. In this way, the positioning pins can make the multi-layer battery cells 210 aligned with each other, avoiding misalignment of the multi-layer battery cells 210 when stacked, thereby improving the uniformity of force on the multi-layer battery cells 210 and enhancing the structural stability when setting up multi-layer battery cells 210.

[0088] In some embodiments, the battery device 100 may further include a connecting strip 132. The two ends of the connecting strip 132 are respectively connected to the first connecting portions 1311 of the two support members 131. Thus, the two support members 131 can be connected via the connecting strip 132, and the connection method is simple, reliable, and easy to implement.

[0089] Referring to Figure 13, in some embodiments, the connecting strip 132 has limiting protrusions 1321 at both ends, and the limiting protrusions 1321 abut against the support member 131. This facilitates the positioning of the connecting strip 132 and the limiting protrusions 1311b of the support member 131, and prevents the connecting strip 132 from coming out of the first through hole 1311c of the support member 131 on one side.

[0090] Understandably, the two limiting protrusions 1321 on the connecting bar 132 are threaded on opposite sides. After the two ends of the connecting bar 132 pass through the first through hole 1311c, they can be threadedly connected to the nut. The nut abuts against the side of the limiting protrusion 1311b away from the limiting protrusion 1321. In this way, the connection between the connecting bar 132 and the support member 131 is more stable, and the battery cell 210 is subjected to uniform force.

[0091] Optionally, the battery cell unit 210 may further include a bottom beam 120. The bottom beam 120 is located at the bottom of the battery cell unit 210 and provides support for the battery cell unit 210. Both ends of the bottom beam 120 are connected to the second connecting portions 1312 of the two supporting members 131, respectively. Thus, each battery cell unit 210 is covered and supported by the frame assembly 130, the two limiting plates 110, and the bottom beam 120, and the weight of the battery cell unit 210 is transferred to the frame assembly 130 through the bottom beam 120. Optionally, the connecting strip 132 may be heat-shrinkable tubing-covered to increase the overall insulation performance.

[0092] The battery cell unit 210 of this application is connected to the limiting plate 110 and the bottom beam 120 respectively via support members 131. The support members 131 located on both sides of the two limiting plates 110 are connected by connecting strips 132, making the bottom beam 120, the limiting plates 110, and the support members 131 a single unit. Thus, the weight of the battery cell unit 210 is transmitted to the support members 131 through the bottom beam 120, and the two opposing support members 131 are connected by connecting strips 132. When the support member 131 bears weight, the connecting strips 132 apply tensile force to the support member 131 to improve structural stability. Furthermore, both ends of the support member 131 extend beyond the limiting plates 110, facilitating the separation of the upper and lower limiting plates 110 during stacking. The support member 131 serves as the main load-bearing component. When multiple layers of battery cells 210 are stacked, the support member 131 provides a fulcrum between the stacked battery cells 210, making the load-bearing structure of the battery cells 210 more stable. The battery cells 210 can be stacked in a higher number of layers, which is beneficial to increasing the battery pack's capacity.

[0093] When there are multiple battery cell units 210, the bottom beam 120 can correspond one-to-one with the battery cell unit 210, that is, each bottom beam 120 only bears the weight of the corresponding battery cell unit 210. Alternatively, multiple battery cell units 210 can share one bottom beam 120, that is, the bottom beam 120 bears the weight of all individual battery cells 211 of the battery cell unit 210.

[0094] Referring to Figures 10 and 11, in some embodiments, the bottom beam 120 may include a beam body 121 and connecting ribs 122. Multiple beam bodies 121 are spaced apart along a first direction. The connecting ribs 122 penetrate multiple beam bodies 121, and both ends of the connecting ribs 122 are respectively connected to the second connecting portions 1312 of two support members 131. The connecting ribs 122 and the second connecting portions 1312 can be fixed by inserting the connecting ribs 122 into mounting holes on the second connecting portions 1312, welding the connecting ribs 122 to the second connecting portions 1312, or threading a connection between the connecting ribs 122 and the second connecting portions 1312. Each individual battery cell 211 of the battery cell unit 210 is supported on the beam body 121. On the one hand, by improving the structural strength of the bottom beam 120, and on the other hand, by connecting the bottom beam 120 to the support member 131 through the connecting ribs 122, it is beneficial to transfer the gravity of the battery cell unit 210 on the beam body 121 to the support member 131, thereby improving the uniformity of the force on the battery cell unit 210.

[0095] Referring to Figures 7 and 10, in some embodiments, the second connecting portion 1312 is provided with a second through hole 1312b, which extends through the second connecting portion 1312 along a first direction. The two ends of the connecting rib 122 respectively pass through the second through holes 1312b of the two supporting members 131. Thus, the connection operation between the second connecting portion 1312 and the connecting rib 122 is simple; the connecting rib 122 only needs to be aligned and passed through the second through holes 1312b of the supporting members 131. This helps improve production efficiency and thereby reduce production costs.

[0096] Referring to Figures 10 and 12, in some embodiments, the bottom beams 120 are multiple ones arranged parallel to each other and spaced apart along the second direction. When multiple battery cells 210 are stacked, two adjacent battery cells 210 are supported and connected by a support member 131. The first connecting part 1311 and the second connecting part 1312 of the support member 131 extend beyond the two ends of the limiting plate 110 along the first direction. Thus, there is a gap between two adjacent battery cells 210, and the bottom beams 120 of the battery cells 210 can be spaced apart. A heat exchange channel 140 is defined between two adjacent bottom beams 120 of the upper battery cell 210. The heat exchange channel 140 communicates with the outside. A connecting channel 123 connecting two adjacent heat exchange channels 140 is opened on the beam body 121. Thus, when the battery device 100 of this embodiment is in a long-term operating state, the cell unit 210 will generate a lot of heat. Cooling air can be blown from the heat exchange channel 140 to dissipate heat from the cell unit 210, thereby extending the service life of the cell unit 210.

[0097] Understandably, the connecting channel 123 can be opened on the side of the beam body 121 away from the battery cell unit 210, and the connecting rib 122 passes through the connecting channel, so as to reduce the impact of opening the connecting channel 123 on the structural strength of the beam body 121.

[0098] Referring to Figure 12, in some embodiments, there are multiple heat exchange channels 140, including an air inlet channel 141 and an air outlet channel 142, which are connected by a connecting channel 123. For example, the air inlet channel 141 and the air outlet channel 142 can be arranged at intervals along a first direction, and the connecting channel 123 can be arranged at intervals along a second direction on the beam body 121. This facilitates the entry of heat-dissipating air into the battery device 100 through the air inlet channel 141, and after heat exchange with the battery cell unit 210, the hot air is discharged through the air outlet channel 142, thus improving the heat exchange efficiency.

[0099] Referring again to Figure 12, in some embodiments, air inlet channels 141 are distributed on both sides of air outlet channels 142 along the second direction, and each air inlet channel 141 has an air inlet 1411 at both ends along the first direction; air outlet channels 142 have air outlets 1421 at both ends along the first direction. Thus, the cooling air entering from the two air inlets 1411 of the air inlet channel 141 passes through the connecting channel 123 and enters the air outlet channel 142. Due to the multiple air inlets 1411, the airflow is greater, further improving heat exchange efficiency and extending the service life of the battery cell unit 210.

[0100] Optionally, a liquid cooling plate can be provided between two adjacent battery cell units 210. The liquid cooling plate contains a disc-shaped cooling pipe, and coolant flows through the cooling pipe to cool the battery cell unit 210.

[0101] In some embodiments, the beam body 121 includes a bakelite board. The bakelite board material has good heat resistance and insulation properties, which helps improve the safety of the battery cell unit 210. At the same time, the bakelite board has both high structural strength and workability, which facilitates the creation of connecting channels 123 on the beam body 121 and allows connecting ribs 122 to pass through the beam body 121, thereby improving the structural strength of the beam body 121.

[0102] The arrangement of the bakelite boards may include multiple boards arranged along the first direction, the number of which corresponds to the number of battery cell units 210. The bakelite boards may have through holes along the first direction, and the connecting ribs 122 pass through the through holes of the multiple bakelite boards and are connected to the support member 131.

[0103] In some embodiments, at least one of the support member 131, the connecting strip 132, and the connecting rib 122 of the bottom beam 120 is a steel structural member. For example, one of the support member 131, the connecting strip 132, or the connecting rib 122 may be a steel structural member; or two of the support member 131, the connecting strip 132, or the connecting rib 122 may be steel structural members; or all of the support member 131, the connecting strip 132, and the connecting rib 122 may be steel structural members, for example, Q235 structural steel. This ensures that the support member 131, the connecting strip 132, and the connecting rib 122, which bear the main force in the battery device 100, have sufficient structural strength, preventing deformation under the gravity of the battery cell unit 210 and improving the structural stability of the battery device 100.

[0104] In some embodiments, at least one of the limiting plate 110 and the beam body 121 of the bottom beam 120 is an epoxy resin-glass fiber composite. For example, the limiting plate 110 may be an epoxy resin-glass fiber composite, or the beam body 121 may be an epoxy resin-glass fiber composite, or both the limiting plate 110 and the beam body 121 may be epoxy resin-glass fiber composites. Simultaneously, the epoxy resin-glass fiber composite has excellent fire resistance, ensuring that even in the event of thermal runaway, the multi-layered battery cell unit 210 maintains a good module structure without collapse, with a heat distortion temperature ≥250℃, and maintains a good appearance and no internal fiberglass separation after being burned at 1000℃. Furthermore, the epoxy resin-glass fiber composite also has a certain thermal insulation function, ensuring that the temperature difference between the front and back surfaces reaches more than 50℃ at 0.7 MPa, effectively reducing the impact of extremely cold or hot working environments on the multi-layered battery cell unit 210.

[0105] Referring to Figures 1 and 2, in some embodiments, the battery cell units 210 can be multiple units arranged along a first direction. Each battery cell unit 210 has a limiting plate 110 and a support member 131 on both sides. The support members 131 located between two adjacent battery cell units 210 and belonging to two battery cell units 210 are staggered along a second direction. Since the support members 131 apply a tensile force along the first direction to the connecting strip 132, when there are multiple battery cell units 210 arranged along the first direction, the staggered arrangement of the support members 131 located between two adjacent battery cell units 210 and belonging to two battery cell units 210 along the second direction helps to distribute the weight of the battery cell unit 210 along the second direction, making the force on the battery cell unit 210 more uniform, thereby improving the structural stability of the battery cell unit 210.

[0106] In some embodiments, among the plurality of battery cell units 210, the diameter of the connecting strip 132 corresponding to the other battery cell units 210 except those located at both ends is larger than the diameter of the connecting strip 132 corresponding to the battery cell units 210 at both ends. Since the connecting channel 123 is provided on the beam body 121 of the bottom beam 120 corresponding to the other battery cell units 210 except those at both ends, the structural strength of the beam body 121 is reduced to a certain extent, making the connecting rib 122 at this location subject to a greater force from the battery cell units 210. In order to improve the uniformity of the overall force on the battery device 100, it is necessary to correspondingly thicken the diameter of the connecting strip 132 corresponding to the other battery cell units 210 except those at both ends.

[0107] Referring to Figure 4, in some embodiments, the limiting plate 110 has a wire harness groove 112 along one edge in a third direction. The wire harness groove 112 extends in a second direction, and a fixing hole 113 is formed on the groove wall of the wire harness groove 112. The fixing hole 113 is used for a wire harness fixing member to pass through. In this way, the connecting wire harness after multiple individual battery cells 211 are electrically connected can be stored in the wire harness groove 112, and the wire harness can be fixed by the wire harness fixing member passing through the fixing hole 113, which facilitates the storage of the wire harness of the battery cell unit 210 and avoids damage to the wire harness.

[0108] Optionally, the wiring harness fasteners may include, but are not limited to, nylon cable ties, wiring harness rings, etc., which helps to reduce the production cost of the battery device 100.

[0109] Alternatively, the limiting plate 110 can be formed by pultrusion molding, which makes the forming method of the limiting plate 110 simpler and easier to process and manufacture.

[0110] In some embodiments, the battery device 100 may further include a housing 150, which covers the periphery of the limiting plate 110 and together with the limiting plate 110 forms a closed space. Thus, the housing 150 and the limiting plate 110 form a closed space, preventing outside air and dirt from entering the battery cell 210 and causing contamination, thereby improving the safety of the battery device 100. Of course, in other embodiments, the housing 150 may not be provided.

[0111] In some embodiments, the limiting plate 110 may be provided with a battery management system (BMU), which may include a circuit board and a sampling harness. The sampling harness may be electrically connected to a single battery cell to obtain the operating condition information of the battery cell unit 210. The operating condition information may include temperature, pressure, current, voltage, etc.

[0112] The specific assembly method of the battery device 100 in this embodiment is described below.

[0113] Assemble the limiting plate 110: First, drill holes in the limiting plate 110, and connect the support member 131 to the limiting plate 110 with bolts (e.g., countersunk bolts) so that the support member 131 is locked on the limiting plate 110 and together they form the limiting plate 110.

[0114] The middle battery cell unit 210 is restrained once: the two ends of the connecting rib 122 of the bottom beam 120 are respectively passed through the second connecting part 1312 of the support member 131 on both sides of the middle battery cell unit 210, so that the bottom beam 120 and the limiting plate 110 are connected. Then, the individual battery cells 211 are placed on the bottom beam 120 and stacked to form the battery cell unit 210. Then, the two ends of the connecting strip 132 are respectively passed through the first connecting part 1311 of the support member 131 of the two limiting plates 110, the two limiting plates 110 are squeezed, and the connecting strip 132 is locked to complete the restraint once.

[0115] Secondary restraint is applied to the battery cells 210 on both sides: the second connecting part of the support member 131 on the limiting plate 110 of the battery cells 210 on both sides is connected to the connecting rib 122 of the bottom beam 120, then the individual battery cells 211 of the battery cells 210 on both sides are placed on the bottom beam, and finally the two ends of the connecting strip 132 corresponding to the battery cells 210 on both sides are passed through the two corresponding limiting plates 110 respectively, the two limiting plates 110 are squeezed and the connecting strip 132 is locked to complete the secondary restraint.

[0116] A second aspect of this application provides a battery cabinet, including the battery device 100 described in the first aspect.

[0117] The battery cabinet of this application has higher structural strength due to the use of the battery device 100 described above, and the battery cell units 210 can be stacked in more layers, which expands the space utilization and improves the reliability of the battery cabinet.

[0118] A third aspect of this application provides an energy storage system, including the aforementioned battery cabinet or the aforementioned battery device.

[0119] The energy storage system according to the embodiments of this application has better reliability by setting the battery cabinet or battery device of the above embodiments.

[0120] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0121] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0122] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0123] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery device (100), characterized by include: At least two battery cell units (210), each battery cell unit (210) comprising a single battery cell (211); A support member (131) is fixedly connected to the battery cell unit (110), and two adjacent battery cells are stacked by abutting each other through their respective support members.

2. The battery device (100) according to claim 1, characterized in that, The battery device also includes: A limiting plate (110) is provided on both sides of the battery cell unit (210) along a first direction. The supporting member (131) is provided on the side of the limiting plate (110) facing away from the battery cell unit (210), or the supporting member (131) is provided on the side of the limiting plate (110) facing the battery cell unit (210).

3. The battery device (100) according to claim 1, characterized in that, The support member (131) is disposed between the individual battery cells (211).

4. The battery device (100) according to claim 1, characterized in that, The supporting member (131) includes at least one of I-beams, channel steel, angle steel, and round steel.

5. The battery device (100) according to claim 2, characterized in that, The supporting member (131) includes: A first connecting portion (1311) and a second connecting portion (1312) are arranged opposite each other along the height direction, and the first connecting portion (1311) and the second connecting portion (1312) extend beyond the limiting plate (110). The at least two battery cell units (210) include: A first battery cell unit and a second battery cell unit are adjacent to each other, and a first connecting portion of a support member (131) fixed to the first battery cell unit and a second connecting portion of a support member (131) fixed to the second battery cell unit abut against each other.

6. The battery device (100) according to claim 5, characterized in that, The support member (131) further includes: A transition connection (1313) located between the first connecting part (1311) and the second connecting part (1312).

7. The battery device (100) according to claim 6, characterized in that, One of the first connecting part (1311) and the second connecting part (1312) is provided with a limiting structure, and the other is provided with a limiting engagement structure adapted to the limiting structure. When the first battery cell unit and the second battery cell unit are stacked, the limiting structure of the support member (131) fixed to the first battery cell unit and the limiting engagement structure of the support member (131) fixed to the second battery cell unit support each other and engage with each other.

8. The battery device (100) according to claim 7, characterized in that, The limiting fit structure forms a limiting groove (1314).

9. The battery device (100) according to claim 8, characterized in that, The first connecting portion (1311) includes a body segment (1311a) and two limiting protrusions (1311b). The limiting protrusions (1311b) are located on the side of the body segment (1311a) facing away from the second connecting portion (1312). The two limiting protrusions (1311b) are spaced apart on the body segment (1311a) along a second direction and together with the body segment (1311a) define the limiting groove (1314). The width of the second connecting portion (1312) along the second direction is less than or equal to the width of the limiting groove (1314).

10. The battery device (100) according to claim 9, characterized in that, The main body segment (1311a) and the transition connection portion (1313) are perpendicular to each other.

11. The battery device (100) according to claim 9, characterized in that, The width of the limiting groove (1314) is 130mm-140mm, or the width of the second connecting part (1312) is 125mm-135mm.

12. The battery device (100) according to claim 7, characterized in that, The transition connection part (1313) is provided with a first connection hole (1313a), and the limiting plate (110) is provided with a first connection mating hole (111). The support member (131) and the limiting plate (110) are connected by a first fastener (133) passing through the first connection hole (1313a) and the first connection mating hole (111) in sequence.

13. The battery device (100) according to claim 9, characterized in that, The main body section (1311a) is provided with a second connecting hole (1311d) extending through the height direction, and the second connecting part (1312) is provided with a second connecting mating hole (1312a) opposite to the second connecting hole (1311d). When the first battery cell and the second battery cell are stacked, the two support members (131) are connected by a second fastener (134) passing through the second connection hole (1311d) of the support member (131) fixed to the first battery cell and the second connection mating hole (1312a) of the support member (131) fixed to the second battery cell.

14. The battery device (100) according to any one of claims 5-13, characterized in that, The support member (131) is also provided with a positioning hole (1315) that runs through the height direction. When the first battery cell unit and the second battery cell unit are stacked, the two support members (131) are positioned by positioning pins passing through the positioning hole (1315) of the support member (131) fixed to the first battery cell unit and the positioning hole (1315) of the support member (131) fixed to the second battery cell unit in sequence.

15. The battery device (100) according to any one of claims 9-13, characterized in that, Also includes: A connecting strip (132) is provided, the two ends of which are respectively connected to the first connecting portions (1311) of the two supporting members (131).

16. The battery device (100) according to claim 15, characterized in that, The limiting protrusion (1311b) is provided with a first through hole (1311c) that extends along the first direction, and the connecting strip (132) passes through the first through hole (1311c).

17. The battery device (100) according to claim 15, characterized in that, The connecting strip (132) is provided with limiting protrusions (1321) at both ends, and the limiting protrusions (1321) abut against the supporting member (131).

18. The battery device (100) according to claim 15, characterized in that, The surface of the connecting strip (132) is provided with a first insulating layer.

19. The battery device (100) according to any one of claims 6-13, characterized in that, Also includes: The bottom beam (120) is connected at both ends to the second connecting parts (1312) of the two supporting members (131).

20. The battery device (100) according to claim 19, characterized in that, The bottom beam (120) includes: The beam body (121) and connecting ribs (122) are arranged at intervals along the first direction. The connecting ribs (122) pass through the multiple beam bodies (121). The two ends of the connecting ribs (122) are respectively connected to the second connecting portions (1312) of the two supporting members (131). The beam body (121) is adapted to support the battery cell unit (210).

21. The battery device (100) according to claim 20, characterized in that, The second connecting part (1312) is provided with a second through hole (1312b) that runs through the first direction, and the two ends of the connecting rib (122) are respectively inserted into the second through holes (1312b) of the two supporting members (131).

22. The battery device (100) according to claim 20, characterized in that, The bottom beams (120) are arranged in parallel and spaced apart along the second direction. When the multiple battery cells (210) are stacked, a heat exchange channel (140) is defined between the two adjacent bottom beams (120) of the upper battery cell (210). The heat exchange channel (140) is connected to the outside. A connecting channel (123) connecting the two adjacent heat exchange channels (140) is provided on the beam body (121).

23. The battery device (100) according to claim 22, characterized in that, There are multiple heat exchange channels (140), each including an air inlet channel (141) and an air outlet channel (142), which are connected by the connecting channel (123).

24. The battery device (100) according to claim 23, characterized in that, The air inlet channel (141) is distributed on both sides of the air outlet channel (142) along the second direction. Each of the air inlet channels (141) is provided with an air inlet (1411) at both ends along the first direction; The air outlet channel (142) is provided with air outlets (1421) at both ends along the first direction.

25. The battery device (100) according to any one of claims 20-24, characterized in that, The beam body (121) includes bakelite board or epoxy resin-glass fiber composite.

26. The battery device (100) according to claim 20, characterized in that, The connecting ribs (122) of the bottom beam (120) are steel structural components.

27. The battery device (100) according to claim 2, characterized in that, The limiting plate (110) has a wire harness groove (112) on one side edge along the third direction. The wire harness groove (112) extends along the second direction. A fixing hole (113) is provided on the groove wall of the wire harness groove (112). The fixing hole (113) is used for the wire harness fixing member to pass through.

28. The battery device (100) according to claim 2, characterized in that, Also includes: The control device is located on the side of the limiting plate (110) facing away from the battery cell unit (210).

29. The battery device (100) according to claim 2, characterized in that, Also includes: The outer shell (150) covers the periphery of the limiting plate (110) and together with the limiting plate (110) forms a closed space.

30. A battery cabinet, characterized in that, It includes a cabinet and a battery device (100) according to any one of claims 1-29.

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