Battery device, battery cabinet and energy storage system

Abstract

The invention provides a battery device, a battery cabinet and an energy storage system, the battery device comprises at least two battery cell units, and each battery cell unit comprises a single battery cell; the supporting components are fixedly connected with the battery cell units, and every two adjacent battery cell units abut against each other through the corresponding supporting components to achieve stacking. According to the battery device disclosed by the invention, the single battery cells of the battery cell units are fixed through the supporting components, and the two adjacent battery cell units abut against each other through the corresponding supporting components to realize stacking, so that after the stacking is completed, the gravity of the upper-layer battery cell unit is transferred to the supporting components of the lower-layer battery cell unit through the corresponding supporting components, and thus, the weight of the battery cell units is reduced. According to the battery device, the single battery cells of the two adjacent battery cell units can be prevented from being extruded and damaged, so that the mounting stability and reliability of the battery device can be improved, and the battery device can work better.

Description

Technical Field

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

[0002] With the rapid development of renewable energy and the increasing global demand for clean energy, energy storage systems are becoming increasingly important in modern power systems. Energy storage systems not only balance power supply and demand but also improve the stability and reliability of the power grid.

[0003] Existing energy storage systems generally have a structure of stacking multiple layers of battery cells. However, when multiple layers of battery cells are stacked, the overall structural stability is poor and the lower battery cells may be damaged by pressure. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery device, a battery cabinet and an energy storage system, which bear the weight of the battery cell units through supporting components, which is beneficial to improving the overall structural stability and avoiding mutual squeezing and damage between the battery cell units.

[0005] In a first aspect, the present application provides a battery device comprising: at least two battery cell units, each of which comprises a single battery cell; a support member, wherein the support member is fixedly connected to the battery cell unit, and two adjacent battery cell units are stacked by abutting against each other through the corresponding support member.

[0006] In some embodiments, the battery device further includes: a limiting plate, the limiting plate being arranged on both sides of the battery cell unit along the first direction, the supporting member being arranged on the side of the limiting plate facing away from the battery cell unit, or the supporting member being arranged on the side of the limiting plate facing the battery cell unit.

[0007] In some embodiments, the support member is disposed between the battery cells.

[0008] In some embodiments, the support member includes at least one of an I-beam, a channel steel, an angle steel, and a round steel.

[0009] In some embodiments, the support member includes: a first connection portion and a second connection portion, the first connection portion and the second connection portion are arranged opposite to each other in the height direction, the first connection portion and the second connection portion are arranged beyond the limit plate, the at least two battery cell units include a first battery cell unit and a second battery cell unit, the first battery cell unit and the second battery cell unit are adjacent, and the first connection portion of the support member fixed to the first battery cell unit and the second connection portion of the support member fixed to the second battery cell unit are abutted.

[0010] In some embodiments, the support member further includes a transition connection portion located between the first connection portion and the second connection portion.

[0011] 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 matching 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 matching structure of the support member fixed to the second battery cell unit support and match each other.

[0012] In some embodiments, the limiting matching structure forms a limiting groove.

[0013] In some embodiments, the first connecting portion includes a main body segment and two limiting protrusions, the limiting protrusions are located on the side of the main body segment facing away from the second connecting portion, the two limiting protrusions are respectively located on the main body segment and spaced apart along the second direction, and together with the main body segment define the limiting groove, and the width of the second connecting portion along the second direction is less than or equal to the width of the limiting groove.

[0014] In some embodiments, the body segment and the transition portion are perpendicular to each other.

[0015] In some embodiments, the width of the limiting groove is 130 mm-140 mm, or the width of the second connecting portion is 125 mm-135 mm.

[0016] In some embodiments, a first connection hole is provided on the transition connection portion, a first connection matching hole is provided on the limiting plate, and the support member and the limiting plate are connected by a first fastener passing through the first connection hole and the first connection matching hole in sequence.

[0017] In some embodiments, the main body segment is provided with a second connection hole extending through the body segment in the height direction, and the second connection portion is provided with a second connection fitting hole opposite to the second connection 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 connection hole of the support member fixed to the first battery cell unit and the second connection fitting hole of the support member fixed to the second battery cell unit.

[0018] In some embodiments, the support member is further provided with a positioning hole extending 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 that pass through the positioning holes of the support member fixed to the first battery cell unit and the positioning holes of the support member fixed to the second battery cell unit in sequence.

[0019] In some embodiments, the battery device further includes a connecting bar, wherein both ends of the connecting bar are respectively connected to the first connecting portions of the two supporting members.

[0020] In some embodiments, the limiting protrusion is provided with a first through hole penetrating along the first direction, and the connecting strip is passed through the first through hole.

[0021] In some embodiments, both ends of the connecting strip are provided with limiting protrusions, and the limiting protrusions abut against the supporting member.

[0022] In some embodiments, a first insulating layer is provided on the surface of the connecting bar.

[0023] In some embodiments, the battery device further includes: a bottom beam, wherein both ends of the bottom beam are respectively connected to the second connection portions of the two support members.

[0024] In some embodiments, the bottom beam includes: a beam body and connecting ribs, the beam bodies are multiple and arranged at intervals along the first direction, the connecting ribs run through the multiple beam bodies, and the two ends of the connecting ribs are respectively connected to the second connecting parts of the two supporting members, and the battery cell unit is supported on the beam body.

[0025] In some embodiments, a second through hole penetrating along the first direction is provided on the second connecting portion, and two ends of the connecting rib are respectively passed through the second through holes of the two supporting members.

[0026] In some embodiments, the bottom beams are multiple and arranged in parallel and at intervals along the second direction. When the multiple battery cell units are stacked, a heat exchange channel is defined between the adjacent two bottom beams of the battery cell units located on the upper layer among the two adjacent battery cell units. The heat exchange channel is connected to the outside, and a connecting channel connecting the two adjacent heat exchange channels is opened on the beam body.

[0027] In some embodiments, there are multiple heat exchange channels, and the multiple heat exchange channels include an air inlet channel and an air outlet channel, and the air inlet channel and the air outlet channel are connected through the connecting channel.

[0028] In some embodiments, the air inlet channel is distributed on both sides of the air outlet channel along the second direction, and each of the air inlet channels is provided with an air inlet at both ends along the first direction; and the air outlet channel is provided with an air outlet at both ends along the first direction.

[0029] In some embodiments, the beam body comprises bakelite or epoxy-fiberglass composite.

[0030] In some embodiments, the connecting ribs of the bottom beam are steel structural members.

[0031] In some embodiments, a harness groove is provided on one side edge of the limiting plate along the third direction, the harness groove extends along the second direction, a fixing hole is provided on the groove wall of the harness groove, and the fixing hole is used to pass a harness fixing member for fixing the harness.

[0032] In some embodiments, the battery device further includes: a control device, which is disposed on a side of the limiting plate facing away from the battery cell unit.

[0033] In some embodiments, the battery device further includes: a shell, which covers the periphery of the limiting plate and forms a closed space together with the limiting plate.

[0034] In a second aspect, the present application also provides a battery cabinet, comprising a cabinet body and the above-mentioned battery device.

[0035] In a third aspect, the present application also provides an energy storage system, comprising the above-mentioned battery cabinet, or the above-mentioned battery device.

[0036] In the battery device of the present application, the single cells of the battery unit are fixed by a supporting member, and two adjacent battery units are stacked by abutting against each other through the corresponding supporting members. In this way, after the stacking is completed, the gravity of the upper battery unit is transmitted to the supporting member of the lower battery unit through the corresponding supporting member. In this way, the single cells of the two adjacent battery units can be prevented from being squeezed and damaged, which is beneficial to improving the installation stability and reliability of the battery device and making the battery device work better. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 A schematic structural diagram of a battery device provided with multiple battery cell units according to an embodiment of the present application;

[0039] Figure 2 This is a schematic structural diagram of a battery device according to an embodiment of the present application;

[0040] Figure 3 This is a schematic structural diagram of a battery device according to another embodiment of the present application;

[0041] Figure 4 This is a schematic structural diagram of a limit plate according to an embodiment of the present application;

[0042] Figure 5 This is a schematic diagram of the exploded structure of the supporting member and the limiting plate in the embodiment of the present application;

[0043] Figure 6 This is a schematic structural diagram of a support member according to an embodiment of the present application;

[0044] Figure 7 This is a schematic structural diagram of the connection and cooperation of two supporting members in an embodiment of the present application;

[0045] Figure 8 A schematic structural diagram of a battery device according to an embodiment of the present application from one angle;

[0046] Figure 9 A schematic structural diagram of a battery device according to an embodiment of the present application from another angle;

[0047] Figure 10 This is a schematic structural diagram of the bottom beam of an embodiment of the present application;

[0048] Figure 11 This is a schematic structural diagram of the beam body of the bottom beam of an embodiment of the present application;

[0049] Figure 12 This is a schematic structural diagram of the heat exchange channel at the bottom of the upper battery device when viewed from the lower battery device according to an embodiment of the present application;

[0050] Figure 13 This is a schematic structural diagram of the connecting strip according to an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 100-battery device;

[0053] 110-limiting plate; 111-first connecting hole; 112-wiring harness slot; 113-fixing hole;

[0054] 120- bottom beam; 121- beam body; 122- connecting ribs; 123- connecting channel;

[0055] 130 - skeleton assembly; 131 - support member; 1311 - first connecting portion; 1311a - body segment; 1311b - limiting protrusion; 1311c - first through hole; 1311d - second connecting hole; 1312 - second connecting portion; 1312a - second connecting mating hole; 1312b - second through hole; 1313 - transition connecting portion; 1313a - first connecting hole; 1314 - limiting groove; 1315 - positioning hole;

[0056] 132-connecting strip; 1321-limiting protruding ring; 133-first fastener; 134-second fastener;

[0057] 140-heat exchange channel; 141-air inlet channel; 1411-air inlet; 142-air outlet channel; 1421-air outlet;

[0058] 150-housing;

[0059] 210 - battery cell unit; 211 - single battery cell. DETAILED DESCRIPTION

[0060] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0061] With the rapid development of renewable energy and the increasing global demand for clean energy, energy storage systems are becoming increasingly important in modern power systems. Energy storage systems not only balance power supply and demand but also improve grid stability and reliability. Existing energy storage systems typically utilize a multi-layer stack of battery cells. However, due to the poor overall structural stability of these stacked cells, the lower layers can be damaged by pressure.

[0062] In view of this, the present application provides a battery device, a battery cabinet and an energy storage system. By supporting components to bear the weight of the battery cell units, it is possible to stack multiple layers of battery cell units and avoid mutual squeezing and damage of the stacked battery cells, which is beneficial to improving the reliability of the battery device.

[0063] The following combination Figures 1 to 13 The battery device 100 provided in an embodiment of the present application is described in detail.

[0064] In the examples of this application, refer to Figure 1 , X is the first direction, Y is the second direction, and Z is the third direction.

[0065] refer to Figure 1 and Figure 2 This embodiment provides a battery device 100, including at least two battery cell units 210, each battery cell unit 210 may include a plurality of single battery cells 211, the single battery cells 211 are arranged side by side along a first direction, and aerogel and PU foam are arranged between the single battery cells 211 for heat insulation treatment and to buffer the expansion of the battery cells.

[0066] The battery device 100 may include a support member 131 that is fixedly connected to the battery cell unit 210. For example, the support members 131 may be provided at both ends of the battery cell unit 210 so that the two support members 131 can clamp the individual battery cells 211 of the battery cell unit 210 together to secure the individual battery cells 211. In this case, each battery cell unit 210 has two corresponding support members 131.

[0067] Two adjacent battery cell units 210 are stacked by abutting against each other through corresponding support members 131. For example, two adjacent battery cell units 210 are respectively a first battery cell unit and a second battery cell unit. When the first battery cell unit and the second battery cell unit are stacked, the first battery cell unit can be located on the upper side of the second battery cell unit. At this time, the support members 131 corresponding to the first battery cell unit and the support members 131 corresponding to the second battery cell unit are stacked and pressed against each other. In this way, the weight of the first battery cell unit can be transferred to the support members 131 corresponding to the second battery cell unit through the support members 131 corresponding to the first battery cell unit, and finally transferred to the installation surface of the battery device 100 (such as the bottom wall of the cabinet cavity), thereby preventing the weight of the first battery cell unit from being applied to the single battery cell 211 of the second battery cell unit, thereby preventing the single battery cell 211 of the battery cell unit 210 in the lower layer from being squeezed and damaged.

[0068] In the battery device 100 of the embodiment of the present application, the single cell 211 of each battery cell unit 210 is fixed by a support member 131, and two adjacent battery cell units 210 are stacked by abutting against each other through the corresponding support members 131. In this way, after the stacking is completed, the gravity of the upper battery cell unit 210 is transmitted to the support member 131 of the lower battery cell unit 210 through the corresponding support member 131. In this way, the single cells 211 of the two adjacent battery cell units 210 can be prevented 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.

[0069] Optionally, the battery device 100 may further include: a limiting plate 110. The limiting plates 110 are provided on both sides of the battery cell unit 210 along the first direction. The limiting plates 110 serve as end plates of the battery cell unit 210. The two limiting plates 110 can jointly clamp the battery cell unit 210 to limit the multiple single battery cells 211 in the battery cell unit 210, preventing the heat and expansion of each single battery cell 211 from affecting the overall position layout. It can be understood that when each battery cell unit 210 can be provided with two limiting plates 110, they are respectively located on both sides of the battery cell unit 210 along the first direction.

[0070] That is to say, the support member 131 of this embodiment is a load-bearing component independent of the limiting plate 110. The support member 131 can be fixedly arranged on the side of the limiting plate 110 facing away from the battery cell unit 210, which is conducive to better fitting between the limiting plate 110 and the single battery cell 211; or, the support member 131 can also be fixedly arranged on the side of the limiting plate 110 facing the battery cell unit 210, thus providing more installation methods.

[0071] Alternatively, in other possible embodiments, each battery cell unit 210 includes multiple single cells 211 arranged side by side, for example, multiple single cells 211 are arranged side by side along a first direction. In this case, the support member 131 can be disposed between the single cells 211. The support member 131 can be a structure that surrounds the single cells 211 to facilitate direct connection between the two support members 131, or the support members 131 can be connected via other intermediate connection structures. In this way, the support member 131 has more assembly methods to meet the needs of use under different working conditions.

[0072] In some embodiments, the support member 131 may include at least one of an I-beam, a channel steel, an angle steel, and a round steel. In other words, the support member 131 may be made of at least one of an I-beam, a channel steel, an angle steel, and a round steel.

[0073] For example, when the support member 131 is made of I-beam steel, the cross-section of the support member 131 is I-shaped, so that the two transverse sections of the I-beam can be used to achieve stacking; when the support member 131 is made of channel steel, a groove structure is formed on the support member 131, and the groove structure can be used to accommodate another support member 131, thereby achieving stacking; when the support member 131 is made of angle steel, the support member 131 can be made of at least two angle steels, and the corners of the angle steels can be used to achieve stable stacking; when the support member 131 is made of round steel, the support surface of the support member 131 is arc-shaped, which is conducive to the stable stacking of two support members 131. In this way, the structure of the support member 131 is relatively diverse and has sufficient structural strength.

[0074] In some embodiments, the support member 131 has a first connection portion 1311 and a second connection portion 1312 that are opposite to each other in the height direction (i.e., the third direction). The first connection portion 1311 and the second connection portion 1312 are disposed beyond the limiting plate 110. For example, the first connection portion 1311 extends upward beyond the top end of the limiting plate 110, and the second connection portion 1312 extends downward beyond the bottom end of the limiting plate 110.

[0075] In this way, when the first battery cell unit and the second battery cell unit are stacked along the height direction, the first connection part 1311 of the support member 131 fixed to the first battery cell unit and the second connection part 1312 of the support member 131 fixed to the second battery cell unit 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 unit and the limiting plate 110 fixed to the second battery cell unit. In this way, the limiting plates 110 of the upper and lower adjacent battery devices 100 can maintain a certain interval, so that the weight of the stacked energy storage system is mainly borne by the support member 131 instead of the limiting plate 110, which can ensure that the limiting plates 110 of the two adjacent battery cell units 210 are almost free of force, and deformation of the limiting plates 110 can be avoided, thereby reducing the strength requirements of the limiting plates 110, so that the limiting plates 110 can better limit and fix the single battery cells 211 of the battery cell unit 210, and the strength and reliability of the battery device 100 can be improved. The specific structure and material of the support member 131 of this embodiment can be selected according to actual needs, so that it has sufficient structural strength to bear a large weight.

[0076] refer to Figure 1 、 Figure 3 、 Figure 5 and Figure 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 roughly formed into an I-shape, that is, the support member 131 may be composed of an I-beam. The transition connection portion 1313 can enable the support member 131 to have a certain height so that the first connection portion 1311 and the second connection portion 1312 respectively exceed the upper and lower ends of the limit plate 110. At the same time, vertical transmission of force between the first connection portion 1311 and the second connection portion 1312 can be achieved.

[0077] In some embodiments, the transition portion 1313 is fixedly connected to the limiting plate 110. For example, the transition portion 1313 can be welded to the limiting plate 110, or the transition portion 1313 and the limiting plate 110 can be fixedly connected via a first fastener 133 as described below. The fixed connection between the transition portion 1313 and the limiting plate 110 ensures that the support member 131 is fixedly connected to the limiting plate 110, which helps evenly distribute the gravitational force of the battery cells 210 acting on the battery device 100 to the support member 131, thereby improving the stability of the structure.

[0078] Continue to refer Figure 5 and Figure 6In some embodiments, the transition portion 1313 is provided with a first connection hole 1313a, and the stop plate 110 is provided with a first connection mating hole 111. The first fastener 133 sequentially passes through the first connection hole 1313a and the first connection mating hole 111 to connect the support member 131 and the stop plate 110. This simple structure makes the fixed connection between the support member 131 and the stop plate 110 simple and easy to implement. Furthermore, when the support member 131 or the stop plate 110 needs to be repaired or replaced, only the first fastener 133 needs to be removed, making the repair and replacement operations convenient.

[0079] Optionally, the first fastener 133 may be a screw or a bolt, which helps to reduce the production cost of the battery device 100 .

[0080] refer to Figure 6 、 Figure 7 、 Figure 8 and Figure 9 In some embodiments, one of the first connection portion 1311 and the second connection portion 1312 is provided with a limiting structure, and the other is provided with a limiting matching structure adapted to the limiting structure. For example, the first connection portion 1311 is provided with a limiting structure, and the second connection portion 1312 is provided with a limiting matching structure, or the second connection portion 1312 is provided with a limiting structure, and the first connection portion 1311 is provided with a limiting matching structure.

[0081] When the first and second cell units are stacked, the limiting structure of the support member 131 fixed to the first cell unit and the limiting matching structure of the support member 131 fixed to the second cell unit support and match each other. This allows the cell units 210 to be stacked along the third direction. When the cell units 210 are stacked, the limiting plates 110 of the two cell units 210 do not touch each other, but are supported by the support member 131. This reduces the force acting on the limiting plates 110 of the cell units 210 in the lower layer, thereby improving the structural strength of the cell units 210 when stacked, which is beneficial to extending the service life of the cell units 210.

[0082] refer to Figure 6 and Figure 7 In some embodiments, the retaining structure forms a retaining groove 1314. Thus, when stacking the multi-layer battery devices 100, the retaining structure only needs to be aligned with the retaining groove 1314, making the stacking and installation of the multi-layer battery devices 100 easier. The retaining groove 1314 can be formed in the first connecting portion 1311, in which case the second connecting portion 1312 constitutes the retaining structure. Alternatively, the retaining groove 1314 can be formed in the second connecting portion 1312, in which case the first connecting portion 1311 constitutes the retaining structure.

[0083] refer to Figure 6and Figure 7 In some embodiments, the first connection portion 1311 may include a main body section 1311a and two limiting protrusions 1311b, and the main body section 1311a and the transition connection portion 1313 are perpendicular to each other, or the main body section 1311a and the transition connection portion 1313 may also have a certain angle.

[0084] The limiting protrusion 1311b is located on the side of the main body section 1311a facing away from the second connecting portion 1312. The two limiting protrusions 1311b are spaced apart on the main body section 1311a along the second direction, and together with the main body section 1311a define a limiting groove 1314. For example, the two limiting protrusions 1311b are respectively located at the two ends of the main body section 1311a along the second direction, that is, the two limiting protrusions 1311b and the side of the main body section 1311a facing away from the transition connecting section form a limiting groove 1314.

[0085] 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 in the second direction between the second connecting portion 1312 and the limiting groove 1314 when they mate, thereby improving the precision of the limited mate. Thus, the matching arrangement of the second connecting portion 1312 and the limiting groove 1314 prevents misalignment of the multi-layer battery cell units 210 during assembly. The battery cells 210 can be aligned with each other by simply aligning 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. This helps reduce the difficulty of installing the multi-layer battery cell units 210 and improves the stability of their installation.

[0086] Optionally, in other embodiments, the limiting structure and the limiting matching structure can both be U-shaped slots, located at 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 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, and the connecting piece passes through the two connecting holes to fix the two support members 131.

[0087] Alternatively, in other embodiments, the limiting structure and the limiting matching structure form inverted V-shaped structures parallel to each other, that is, the support member 131 can be made of angle steel, and the two inverted V-shaped structures constitute the first connecting portion 1311 and the second connecting portion 1312 of the support member. A connecting hole along the third direction is opened on the V-shaped edge of the inverted V-shaped structure. When the two battery cells 210 are stacked, the inverted V-shaped structures of the two support members are stacked, and the connecting parts pass through the two connecting holes to fix the two support members 131.

[0088] 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. 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. The width of the second connecting portion 1312 can be reasonably selected within the above range according to actual needs.

[0089] In this way, on the one hand, the support structure 131 can have a sufficient size to maintain a certain structural strength to achieve stable stacking of the battery cell units 210. On the other hand, the first connection part 1311 of the support member 131 fixed to the first battery cell unit and the second connection part 131 of the support member 131 fixed to the second battery cell unit can better achieve limited matching, and the two have a certain assembly margin, which can facilitate assembly.

[0090] refer to Figure 2 、 Figure 3 and Figure 7 In some embodiments, the limiting protrusion 1311b is provided with a first through-hole 1311c extending along a first direction, and the connecting bar 132 is passed through the first through-hole 1311c. Thus, the ends of the connecting bar 132 are respectively connected to the limiting protrusions 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 transferred to the second connecting portions 1312 of the support members 131 on both sides of the battery cell unit 210 via the bottom beam 120, the connecting bar 132 applies a tensile force to the first connecting portions 1311 of the two opposing support members 131, making the force applied to the support members 131 more uniform, thereby improving the stability of the structure.

[0091] refer to Figure 6 and Figure 7In some embodiments, the main body section 1311a is provided with a second connection hole 1311d extending vertically therethrough, and the second connection portion 1312 is provided with a second connection hole 1312a opposite to the second connection hole 1311d. When two adjacent battery cell units 210 (i.e., a first battery cell unit and a second battery cell unit) are stacked, the two support members 131 are connected via the second fastener 134, which passes through the second connection hole 1311d of the support member 131 secured to the first battery cell unit and the second connection hole 1312a of the support member 131 secured to the second battery cell unit. This simplifies assembly operations when stacking multiple battery cell units 210, thereby improving production efficiency.

[0092] It can be understood that in other embodiments of the present application, the support member 131 may not have a limiting structure and a limiting matching structure, that is, the first connection part 1311 and the second connection part 1312 are flush with the surface. When two battery cell units 210 are stacked, the first connection part 1311 and the second connection part 1312 are directly aligned through the second connection hole 1311d of one battery cell unit 210 and the second connection matching hole 1312a of the other battery cell unit 210, and the second fastener 134 passes through the second connection hole 1311d and the second connection matching hole 1312a to fix the two battery cell units 210 in connection.

[0093] Optionally, the second fastener 134 may be a screw or a bolt, which helps to reduce the production cost of the battery cell unit 210 .

[0094] refer to Figure 6 and Figure 7 In some embodiments, the support member 131 is further provided with positioning holes 1315 extending vertically therethrough. When two battery cell units 210 are stacked, the two adjacent battery cell units 210 are stacked via the support member 131. Positioning pins are passed through the positioning holes 1315 of the support member 131 secured to the first battery cell unit and the positioning holes 1315 of the support member 131 secured to the second battery cell unit, respectively, to achieve positioning. In this manner, the positioning pins can ensure alignment between the multiple layers of battery cell units 210, preventing misalignment when the multiple layers of battery cell units 210 are stacked. This improves the uniformity of force applied to the multiple layers of battery cell units 210 and enhances the structural stability of the multiple layers of battery cell units 210.

[0095] In some embodiments, the battery device 100 may further include a connecting bar 132. The two ends of the connecting bar 132 are respectively connected to the first connecting portions 1311 of the two support members 131. Thus, the connecting bar 132 can connect the two support members 131 in a simple, reliable, and easy-to-implement manner.

[0096] refer to Figure 13 In some embodiments, a limiting protrusion 1321 is provided at each end of the connecting bar 132, and the limiting protrusion 1321 abuts against the supporting member 131. This facilitates the positioning of the connecting bar 132 and the limiting protrusion 1311b of the supporting member 131, and prevents the connecting bar 132 from falling out of the first through hole 1311c of the supporting member 131 on one side.

[0097] It can be understood that threads are provided on the opposite sides of the two limiting protrusions 1321 on the connecting bar 132. The two ends of the connecting bar 132 can be threadedly connected to the nut after passing through the first through hole 1311c, and 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 supporting member 131 is more stable, so that the battery cell unit 210 is evenly stressed.

[0098] Optionally, the battery cell unit 210 may further include a bottom beam 120. The bottom beam 120 is provided at the bottom of the battery cell unit 210 to support the battery cell unit 210. The two ends of the bottom beam 120 are respectively connected to the second connection parts 1312 of the two support members 131. In this way, each battery cell unit 210 is supported by the battery cell unit 210 formed by the skeleton 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 skeleton assembly 130 through the bottom beam 120. Optionally, the connecting strip 132 can be coated with a heat shrink tube to increase the overall insulation performance.

[0099] The battery cell unit 210 of the present application is connected to the limiting plate 110 and the bottom beam 120 respectively through the support member 131, and the support members 131 located on both sides of the two limiting plates 110 are connected by the connecting strip 132, so that the bottom beam 120, the limiting plate 110 and the support member 131 form a whole. In this way, the weight of the battery cell unit 210 is transmitted to the support member 131 through the bottom beam 120, and the two opposite support members 131 are connected by the connecting strip 132. When the support member 131 bears the weight, the connecting strip 132 applies a pulling force to the support member 131 to improve the stability of the structure. In addition, both ends of the support member 131 extend beyond the limiting plate 110, which can facilitate the separation of the upper and lower limiting plates 110 when stacking. The support member 131 serves as the main load-bearing component. At the same time, when multiple layers of battery cell units 210 are stacked and used, the support member 131 serves as the main load-bearing component, providing a fulcrum between the stacked battery cell units 210, making the load-bearing structure of the battery cell units 210 more stable. The battery cell units 210 can be stacked in a higher number of layers, which is beneficial to increasing the capacity of the battery pack.

[0100] Among them, when there are multiple battery cell units 210, the bottom beam 120 can correspond to the battery cell units 210 one by one, that is, each bottom beam 120 only bears the weight of the corresponding battery cell unit 210, or, multiple battery cell units 210 can share one bottom beam 120, that is, the bottom beam 120 bears the weight of all single battery cells 211 of the battery cell unit 210.

[0101] refer to Figure 10 and Figure 11 In some embodiments, the bottom beam 120 may include a beam body 121 and connecting ribs 122. The beam bodies 121 are multiple and spaced apart along a first direction. The connecting ribs 122 penetrate the multiple beam bodies 121. The ends of the connecting ribs 122 are respectively connected to the second connecting portions 1312 of the two support members 131. The connecting ribs 122 and the second connecting portions 1312 may be fixed by inserting the connecting ribs 122 into mounting holes on the second connecting portions 1312, welding the connecting ribs 122 and the second connecting portions 1312, or threading the connecting ribs 122 and the second connecting portions 1312. The individual cells 211 of the battery unit 210 are all supported by the beam body 121. On the one hand, the structural strength of the bottom beam 120 is improved, and on the other hand, the bottom beam 120 is connected to the support member 131 by connecting the ribs 122, which helps to transfer the gravity of the battery cell unit 210 exerted on the beam body 121 to the support member 131, thereby improving the uniformity of the force on the battery cell unit 210.

[0102] refer to Figure 7 and Figure 10 In some embodiments, the second connecting portion 1312 is provided with a second through-hole 1312b that extends through the second connecting portion 1312 along the first direction. The ends of the connecting rib 122 are respectively inserted into the second through-holes 1312b of the two support members 131. This simplifies the connection between the second connecting portion 1312 and the connecting rib 122 by simply aligning the connecting rib 122 and passing it through the second through-holes 1312b of the support members 131. This improves production efficiency and reduces production costs.

[0103] References Figure 10 and Figure 12In some embodiments, multiple bottom beams 120 are arranged parallel and spaced apart along the second direction. When multiple battery cells 210 are stacked, two adjacent battery cells 210 are supported and connected by support members 131, with the first connection portion 1311 and the second connection portion 1312 of the support member 131 respectively extending beyond the ends of the limiting plate 110 along the first direction. Thus, a gap is provided 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 cells 210. The heat exchange channel 140 communicates with the outside, and a connecting channel 123 is provided on the beam body 121 to connect the two adjacent heat exchange channels 140. Thus, when the battery device 100 of this embodiment is in operation for an extended period, the battery cells 210 generate a large amount of heat. Cooling air can be blown through the heat exchange channel 140 to dissipate the heat from the battery cells 210, thereby extending the service life of the battery cells 210.

[0104] It is understandable that the connection 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 connection channel, so as to reduce the impact of the opening of the connection channel 123 on the structural strength of the beam body 121.

[0105] refer 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. The air inlet channel 141 and the air outlet channel 142 are connected through the connecting channel 123. For example, the air inlet channel 141 and the air outlet channel 142 can be arranged at intervals along the first direction, and the connecting channels 123 can be arranged at intervals along the second direction on the beam body 121. This facilitates the flow of heat-dissipating air into the battery device 100 through the air inlet channel 141. After exchanging heat with the battery cells 210, the hot air is discharged through the air outlet channel 142, thereby improving heat exchange efficiency.

[0106] Continue to refer Figure 12 In some embodiments, the air inlet channels 141 are located on both sides of the air outlet channels 142 along the second direction. Each air inlet channel 141 is provided with an air inlet 1411 at both ends along the first direction; and each air outlet channel 142 is provided with an air outlet 1421 at both ends along the first direction. In this manner, cooling air entering through the two air inlets 1411 of the air inlet channels 141 passes through the connecting channel 123 and enters the air outlet channels 142. The provision of multiple air inlets 1411 increases the air intake, further improving heat exchange efficiency and facilitating a longer service life for the battery cell units 210.

[0107] Optionally, a liquid cooling plate may be provided between two adjacent layers of battery cell units 210 . A disc-shaped cooling pipe is provided in the liquid cooling plate. Cooling liquid flows through the cooling pipe to cool the battery cell units 210 through the liquid cooling plate.

[0108] In some embodiments, the beam body 121 comprises bakelite. This material has excellent heat resistance and insulation properties, which helps improve the safety of the battery cell 210. Furthermore, bakelite offers both strong structural strength and workability, facilitating the creation of connection channels 123 in the beam body 121 and facilitating the passage of the connecting ribs 122 through the beam body 121, thereby enhancing the structural strength of the beam body 121.

[0109] The arrangement of the bakelite board may include multiple boards arranged along the first direction, the number of which corresponds to the number of battery cell units 210 . The bakelite board may be provided with 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 .

[0110] In some embodiments, at least one of the support member 131, the connecting bar 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 bar 132, or the connecting rib 122 may be a steel structural member, or two of the support member 131, the connecting bar 132, or the connecting rib 122 may be steel structural members, or all of the support member 131, the connecting bar 132, and the connecting rib 122 may be steel structural members, for example, the steel structural members may be Q235 structural steel. In this way, the support member 131, the connecting bar 132, and the connecting rib 122, which are the main load-bearing members in the battery device 100, have sufficient structural strength to avoid deformation under the gravity of the battery cell unit 210, thereby improving the structural stability of the battery device 100.

[0111] 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 can be an epoxy resin-glass fiber composite, or the beam body 121 can be an epoxy resin-glass fiber composite, or both the limiting plate 110 and the beam body 121 can be epoxy resin-glass fiber composite. At the same time, the epoxy resin-glass fiber composite has good fire resistance, which can ensure that in the event of thermal runaway of the battery cell 210, the module structure of the multi-layer battery cell 210 is good and does not collapse, the thermal deformation temperature is ≥250°C, and after being burned at 1000°C, it can ensure good appearance and no internal glass fiber scattering. In addition, the epoxy resin-glass fiber composite also has a certain thermal insulation function, which can ensure that the temperature difference between the front and back sides reaches more than 50°C at 0.7Mpa, which can effectively reduce the impact of extremely cold or extremely hot working environments on the multi-layer battery cell 210.

[0112] refer to Figure 1 and Figure 2 In some embodiments, a plurality of battery cell units 210 may be arranged along a first direction, with a limiting plate 110 and a support member 131 provided on both sides of each battery cell unit 210. The support members 131 located between and belonging to two adjacent battery cell units 210 are staggered along a second direction. Because the support members 131 exert a pulling force along the first direction on the connecting bars 132, when a plurality of battery cell units 210 are arranged along the first direction, the staggered arrangement of the support members 131 located between and belonging to two adjacent battery cell units 210 along the second direction facilitates dispersing the weight of the battery cell units 210 along the second direction, making the force applied to the battery cell units 210 more uniform, thereby improving the structural stability of the battery cell units 210.

[0113] In some embodiments, among the multiple battery cells 210, the diameter of the connecting bars 132 corresponding to the battery cells 210 other than those located at the two ends is larger than the diameter of the connecting bars 132 corresponding to the battery cells 210 at the two ends. Because the connecting channels 123 are provided on the beam body 121 of the bottom beam 120 corresponding to the battery cells 210 other than those located at the two ends, the structural strength of the beam body 121 is reduced to a certain extent, resulting in a greater force applied by the battery cells 210 to the connecting ribs 122 there. To improve the uniformity of the force applied to the entire battery device 100, the diameter of the connecting bars 132 corresponding to the battery cells 210 other than those located at the two ends needs to be increased accordingly.

[0114] refer to Figure 4In some embodiments, a wire harness slot 112 is defined along one edge of the limiting plate 110 along the third direction. The wire harness slot 112 extends along the second direction, and a fixing hole 113 is defined in the wall of the wire harness slot 112. The fixing hole 113 is configured to pass a wire harness fixing member that secures the wire harness. In this manner, the wire harness connecting multiple battery cells 211 after electrical connection can be stored within the wire harness slot 112. The wire harness fixing member is inserted into the fixing hole 113 to secure the wire harness, facilitating storage of the wire harness of the battery cell unit 210 and preventing damage to the wire harness.

[0115] Optionally, the harness fixing member may include but is not limited to a nylon cable tie, a harness ring, etc., which is helpful in reducing the production cost of the battery device 100 .

[0116] Optionally, the limiting plate 110 may be formed by pultrusion. In this way, the limiting plate 110 is formed in a simpler manner and is easy to process and manufacture.

[0117] In some embodiments, the battery device 100 may further include a housing 150, which wraps around the limiting plate 110 and, together with the limiting plate 110, forms an enclosed space. Thus, the housing 150 and the limiting plate 110 form an enclosed space, preventing outside air and dirt from entering the battery cells 210 and contaminating them, thereby improving the safety of the battery device 100. Of course, in other embodiments, the housing 150 may not be provided.

[0118] In some embodiments, a battery management system (BMU) may be provided on the limiting plate 110. The battery management system may include a circuit board and a sampling harness. The sampling harness may be electrically connected to the single battery cell to obtain operating condition information of the battery cell unit 210. The operating condition information may include temperature, pressure, current, voltage, etc.

[0119] The specific assembly method of the battery device 100 of this embodiment is described below.

[0120] Assemble the limiting plate 110: First, drill holes in the limiting plate 110, connect the support member 131 and the limiting plate 110 with bolts (such as countersunk bolts), so that the support member 131 is locked on the limiting plate 110 and together they form the limiting plate 110;

[0121] 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 parts 1312 of the support members 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 single 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 bar 132 are respectively passed through the first connecting parts 1311 of the support members 131 of the two limiting plates 110. The two limiting plates 110 are squeezed and the connecting bar 132 is locked to complete the primary restraint.

[0122] Perform secondary restraint on the battery cell units 210 on both sides: connect the second connection part of the supporting member 131 on the limiting plate 110 of the battery cell units 210 on both sides to the connecting rib 122 of the bottom beam 120, then place the single battery cells 211 of the battery cell units 210 on both sides on the bottom beam, and finally pass the two ends of the connecting strips 132 corresponding to the battery cell units 210 on both sides through the corresponding two limiting plates 110 respectively, squeeze the two limiting plates 110, and lock the connecting strips 132 to complete the secondary restraint.

[0123] A second aspect of the present application provides a battery cabinet, comprising the battery device 100 of the first aspect described above.

[0124] The battery cabinet of the present application uses the above-mentioned battery device 100, so the structural strength of the battery device 100 is higher, and the battery cell units 210 can be stacked in more layers, thereby expanding space utilization and improving the reliability of the battery cabinet.

[0125] A third aspect of the present application provides an energy storage system, comprising the above-mentioned battery cabinet, or the above-mentioned battery device.

[0126] The energy storage system according to the embodiment of the present application has better reliability by providing the battery cabinet or battery device of the above embodiment.

[0127] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0128] It should be noted that phrases such as "one embodiment," "an embodiment," "exemplary embodiments," and "some embodiments" in this specification may indicate embodiments that may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0129] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0130] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

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

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

3. The battery device (100) according to claim 1, characterized in that The supporting member (131) is arranged between the single battery cells (211).

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

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

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

7. The battery device (100) according to claim 6, characterized in that 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 matching 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 matching structure of the support member (131) fixed to the second battery cell unit support each other and limit matching.

8. The battery device (100) according to claim 7, characterized in that The limiting matching 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 main body section (1311a) and two limiting protrusions (1311b), wherein the limiting protrusions (1311b) are located on the side of the main body section (1311a) facing away from the second connecting portion (1312), and the two limiting protrusions (1311b) are spaced apart along the second direction on the main body section (1311a), and together with the main body section (1311a) define the limiting groove (1314), and 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 section (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 portion (1312) is 125mm-135mm.

12. The battery device (100) according to claim 7, characterized in that The transition connection portion (1313) is provided with a first connection hole (1313a), the limiting plate (110) is provided with a first connection matching hole (111), and 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 matching hole (111) in sequence.

13. The battery device (100) according to claim 9, characterized in that The body section (1311a) is provided with a second connection hole (1311d) penetrating along the height direction, and the second connection portion (1312) is provided with a second connection matching hole (1312a) opposite to the second connection hole (1311d). When 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 connection hole (1311d) of the support member (131) fixed to the first battery cell unit and the second connection fitting hole (1312a) of the support member (131) fixed to the second battery cell unit.

14. The battery device (100) according to any one of claims 5 to 13, characterized in that: The support member (131) is further provided with a positioning hole (1315) penetrating in 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 that sequentially pass 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.

15. The battery device (100) according to any one of claims 9 to 13, characterized in that: Also includes: A connecting bar (132), wherein both ends of the connecting bar (132) 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) penetrating along the first direction, and the connecting strip (132) is passed through the first through hole (1311c).

17. The battery device (100) according to claim 15, characterized in that Both ends of the connecting strip (132) are respectively provided with limiting protruding rings (1321), and the limiting protruding rings (1321) are in contact with the supporting member (131).

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

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

20. The battery device (100) according to claim 19, characterized in that The bottom beam (120) comprises: A beam body (121) and a connecting rib (122), wherein a plurality of the beam bodies (121) are spaced apart along the first direction, the connecting rib (122) passes through the plurality of the beam bodies (121), and both ends of the connecting rib (122) are respectively connected to the second connecting portions (1312) of the two supporting members (131), and the beam body (121) is suitable for supporting the battery cell unit (210).

21. The battery device (100) according to claim 20, characterized in that The second connecting portion (1312) is provided with a second through hole (1312b) penetrating along the first direction, and the two ends of the connecting rib (122) are respectively passed through 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 at intervals along the second direction. When the plurality of battery cell units (210) are stacked, a heat exchange channel (140) is defined between the adjacent two bottom beams (120) of the battery cell unit (210) located on the upper layer. The heat exchange channel (140) is communicated with the outside, and a connecting channel (123) communicating with 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), and the multiple heat exchange channels (140) include an air inlet channel (141) and an air outlet channel (142). The air inlet channel (141) and the air outlet channel (142) are connected through 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 air inlets (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 to 24, characterized in that: The beam body (121) comprises a bakelite board or an 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 members.

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

28. The battery device (100) according to claim 2, characterized in that Also includes: A control device is provided on a 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: A shell (150) is covered on the peripheral side of the limiting plate (110) and forms a closed space together with the limiting plate (110).

30. A battery cabinet, characterized in that: The invention comprises a cabinet and a battery device (100) according to any one of claims 1 to 29.

31. An energy storage system, characterized in that: The battery cabinet comprises the battery cabinet according to claim 30, or the battery device (100) according to any one of claims 1 to 29.

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